.clang-format

@@ -11,7 +11,7 @@ ReflowComments: true
 SpacesBeforeTrailingComments: 3
 TabWidth: 4
 ConstructorInitializerAllOnOneLineOrOnePerLine: true
-ColumnLimit: 130
+ColumnLimit: 110
 AllowShortBlocksOnASingleLine: Never
 AllowShortFunctionsOnASingleLine: None
 AllowShortEnumsOnASingleLine: false

.gitignore

@@ -5,5 +5,4 @@ cmake-*
 .xmake
 compile_commands.json
 out
-xpbuild
+xpbuild
-cbuild

.gitmodules

@@ -6,6 +6,3 @@
 	path = filecomplete
 	url = https://www.sinxmiao.cn/taynpg/filecomplete
 	branch = main
-[submodule "crashelper"]
-	path = crashelper
-	url = https://www.sinxmiao.cn/taynpg/crashelper

.vscode/settings.json

@@ -1,8 +1,10 @@
 {
     "files.autoSave": "onFocusChange",
-    "editor.fontSize": 13,
+    "editor.fontSize": 14,
-    "editor.fontFamily": "'Monaspace Krypton Light', 'Monaspace Krypton Light', 'Monaspace Krypton Light'",
+    "editor.fontFamily": "'FiraCode Nerd Font Mono', 'FiraCode Nerd Font Mono', 'FiraCode Nerd Font Mono'",
-    "terminal.integrated.fontFamily": "Monaspace Krypton Light",
+    "terminal.integrated.fontFamily": "FiraCode Nerd Font Mono",
+    "editor.fontLigatures": true,
+    //"C_Cpp.default.configurationProvider": "tboox.xmake-vscode",
     "cmake.configureOnOpen": true,
     "cmake.debugConfig": {
         "console": "integratedTerminal",
@@ -17,20 +19,22 @@
                 "ignoreFailures": true
             }
         ],
+        "visualizerFile": "${workspaceRoot}/.vscode/qt5.natvis",
         "args": [
-            "9999"
+            "-n", "1"
         ]
     },
-    "cmake.configureArgs": [
+    "cmake.environment": {
-        "-Wno-dev", 
+        "PATH": "${env:PATH};"
-        "-DGRAB_CRASH=ON"
-    ],
-    "cmake.configureSettings": {
-	    //"CMAKE_TOOLCHAIN_FILE": "${env:VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake"
     },
+    // "cmake.configureArgs": [
+    //     "-Wno-dev", 
+    //     "-DSYSTEM_XP=ON"
+    // ],
     "cmake.options.statusBarVisibility": "visible",
     "cmake.generator": "Ninja",
-    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools",
+    "C_Cpp.default.compileCommands": "${workspaceRoot}/build/compile_commands.json",
+    "C_Cpp.default.cppStandard": "c++17",
     "editor.inlayHints.enabled": "off",
     "editor.unicodeHighlight.allowedLocales": {
         "ja": true,
@@ -38,27 +42,22 @@
         "zh-hans": true
     },
     "files.associations": {
-        ".clang-tidy": "yaml",
+        "xstring": "cpp",
-        "filesystem": "cpp",
+        "vector": "cpp",
-        "regex": "cpp",
+        "string": "cpp",
-        "functional": "cpp",
         "algorithm": "cpp",
         "any": "cpp",
         "array": "cpp",
         "atomic": "cpp",
-        "bit": "cpp",
         "bitset": "cpp",
         "cctype": "cpp",
-        "charconv": "cpp",
         "chrono": "cpp",
+        "cinttypes": "cpp",
         "clocale": "cpp",
         "cmath": "cpp",
         "codecvt": "cpp",
-        "compare": "cpp",
         "complex": "cpp",
-        "concepts": "cpp",
         "condition_variable": "cpp",
-        "coroutine": "cpp",
         "csignal": "cpp",
         "cstdarg": "cpp",
         "cstddef": "cpp",
@@ -68,13 +67,13 @@
         "cstring": "cpp",
         "ctime": "cpp",
         "cwchar": "cpp",
+        "cwctype": "cpp",
         "deque": "cpp",
         "exception": "cpp",
-        "expected": "cpp",
+        "filesystem": "cpp",
-        "resumable": "cpp",
-        "format": "cpp",
         "forward_list": "cpp",
         "fstream": "cpp",
+        "functional": "cpp",
         "future": "cpp",
         "initializer_list": "cpp",
         "iomanip": "cpp",
@@ -98,22 +97,21 @@
         "ratio": "cpp",
         "set": "cpp",
         "shared_mutex": "cpp",
-        "source_location": "cpp",
         "sstream": "cpp",
-        "stack": "cpp",
         "stdexcept": "cpp",
-        "stop_token": "cpp",
         "streambuf": "cpp",
-        "string": "cpp",
+        "string_view": "cpp",
+        "strstream": "cpp",
         "system_error": "cpp",
         "thread": "cpp",
         "tuple": "cpp",
         "type_traits": "cpp",
+        "typeindex": "cpp",
         "typeinfo": "cpp",
         "unordered_map": "cpp",
         "utility": "cpp",
+        "valarray": "cpp",
         "variant": "cpp",
-        "vector": "cpp",
         "xfacet": "cpp",
         "xhash": "cpp",
         "xiosbase": "cpp",
@@ -125,9 +123,37 @@
         "xlocnum": "cpp",
         "xloctime": "cpp",
         "xmemory": "cpp",
-        "xstring": "cpp",
+        "xmemory0": "cpp",
+        "xstddef": "cpp",
         "xtr1common": "cpp",
         "xtree": "cpp",
-        "xutility": "cpp"
+        "xutility": "cpp",
-    }
+        "qbytearray": "cpp",
+        "*.ipp": "cpp",
+        "xthread": "cpp",
+        "*.tcc": "cpp",
+        "regex": "cpp",
+        "bit": "cpp",
+        "memory_resource": "cpp",
+        "source_location": "cpp",
+        "charconv": "cpp",
+        "compare": "cpp",
+        "concepts": "cpp",
+        "coroutine": "cpp",
+        "format": "cpp",
+        "stop_token": "cpp",
+        "expected": "cpp",
+        "numbers": "cpp",
+        "semaphore": "cpp",
+        "span": "cpp",
+        "text_encoding": "cpp",
+        "*.in": "cpp",
+        "hash_map": "cpp",
+        "stdfloat": "cpp",
+        "unordered_set": "cpp",
+        "cfenv": "cpp",
+        "cassert": "cpp"
+    },
+    "makefile.configureOnOpen": false,
+    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools"
 }

3rd/ColorConsole.hpp

@@ -1,225 +0,0 @@
-// Based on https://gitee.com/whatitis/ColorfulConsoleIO/ modification
-
-#include <iostream>
-#include <string>
-
-#if defined(_WIN32)
-#include <windows.h>
-#endif   // OS_TYPE_WINDOWS_CC
-
-// Enum class for console text color
-enum class ConsoleColor {
-    Green,
-    Red,
-    Blue,
-    White,
-    Black,
-    Yellow,
-    Purple,
-    Gray,
-    Cyan,
-    None,
-    GreenIntensity,
-    RedIntensity,
-    BlueIntensity,
-    WhiteIntensity,
-    BlackIntensity,
-    YellowIntensity,
-    PurpleIntensity,
-    GrayIntensity,
-    CyanIntensity
-};
-
-// Enum class for console background color
-enum class ConsoleBackgroundColor {
-    Green,
-    Red,
-    Blue,
-    White,
-    Black,
-    Yellow,
-    Purple,
-    Gray,
-    Cyan,
-    None
-};
-
-#if defined(_WIN32)
-// Get the Windows color code for a given ConsoleColor
-inline WORD GetColorCode(ConsoleColor color)
-{
-    switch (color) {
-    case ConsoleColor::Green:
-        return FOREGROUND_GREEN;
-    case ConsoleColor::Black:
-        return 0;
-    case ConsoleColor::Blue:
-        return FOREGROUND_BLUE;
-    case ConsoleColor::Gray:
-        return FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED;
-    case ConsoleColor::Purple:
-        return FOREGROUND_BLUE | FOREGROUND_RED;
-    case ConsoleColor::Red:
-        return FOREGROUND_RED;
-    case ConsoleColor::White:
-        return FOREGROUND_BLUE | FOREGROUND_RED | FOREGROUND_GREEN;
-    case ConsoleColor::Cyan:
-        return FOREGROUND_BLUE | FOREGROUND_GREEN;
-    case ConsoleColor::Yellow:
-        return FOREGROUND_RED | FOREGROUND_GREEN;
-    case ConsoleColor::None:
-        return FOREGROUND_BLUE | FOREGROUND_RED | FOREGROUND_GREEN;
-    case ConsoleColor::GreenIntensity:
-        return FOREGROUND_GREEN | FOREGROUND_INTENSITY;
-    case ConsoleColor::BlackIntensity:
-        return 0;
-    case ConsoleColor::BlueIntensity:
-        return FOREGROUND_BLUE | FOREGROUND_INTENSITY;
-    case ConsoleColor::GrayIntensity:
-        return FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED | FOREGROUND_INTENSITY;
-    case ConsoleColor::PurpleIntensity:
-        return FOREGROUND_BLUE | FOREGROUND_RED | FOREGROUND_INTENSITY;
-    case ConsoleColor::RedIntensity:
-        return FOREGROUND_RED | FOREGROUND_INTENSITY;
-    case ConsoleColor::WhiteIntensity:
-        return FOREGROUND_BLUE | FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_INTENSITY;
-    case ConsoleColor::YellowIntensity:
-        return FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_INTENSITY;
-    case ConsoleColor::CyanIntensity:
-        return FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_INTENSITY;
-    default:
-        return 0;
-    }
-}
-#else
-// Get the ANSI escape code for a given ConsoleColor
-inline std::string GetColorCode(ConsoleColor color)
-{
-    switch (color) {
-    case ConsoleColor::Green:
-        return "\033[32m";
-    case ConsoleColor::Black:
-        return "\033[30m";
-    case ConsoleColor::Blue:
-        return "\033[34m";
-    case ConsoleColor::Gray:
-        return "\033[37m";
-    case ConsoleColor::Purple:
-        return "\033[35m";
-    case ConsoleColor::Red:
-        return "\033[31m";
-    case ConsoleColor::White:
-        return "\033[37m";
-    case ConsoleColor::Cyan:
-        return "\033[36m";
-    case ConsoleColor::Yellow:
-        return "\033[33m";
-    case ConsoleColor::None:
-        return "\033[0m";
-    case ConsoleColor::GreenIntensity:
-        return "\033[32m;1m";
-    case ConsoleColor::BlackIntensity:
-        return "\033[30m;1m";
-    case ConsoleColor::BlueIntensity:
-        return "\033[34m;1m";
-    case ConsoleColor::GrayIntensity:
-        return "\033[37m;1m";
-    case ConsoleColor::PurpleIntensity:
-        return "\033[35m;1m";
-    case ConsoleColor::RedIntensity:
-        return "\033[31m;1m";
-    case ConsoleColor::WhiteIntensity:
-        return "\033[37m;1m";
-    case ConsoleColor::YellowIntensity:
-        return "\033[33m;1m";
-    case ConsoleColor::CyanIntensity:
-        return "\033[36m;1m";
-    default:
-        return 0;
-    }
-}
-#endif
-
-#if defined(_WIN32)
-// Get the Windows color code for a given ConsoleBackgroundColor
-inline WORD GetBackgroundColorCode(ConsoleBackgroundColor color)
-{
-    switch (color) {
-    case ConsoleBackgroundColor::Green:
-        return BACKGROUND_GREEN;
-    case ConsoleBackgroundColor::Black:
-        return 0;
-    case ConsoleBackgroundColor::Blue:
-        return BACKGROUND_BLUE;
-    case ConsoleBackgroundColor::Gray:
-        return 0;
-    case ConsoleBackgroundColor::Purple:
-        return BACKGROUND_RED | BACKGROUND_BLUE;
-    case ConsoleBackgroundColor::Red:
-        return BACKGROUND_RED;
-    case ConsoleBackgroundColor::White:
-        return BACKGROUND_RED | BACKGROUND_BLUE | BACKGROUND_GREEN;
-    case ConsoleBackgroundColor::Cyan:
-        return BACKGROUND_BLUE | BACKGROUND_GREEN;
-    case ConsoleBackgroundColor::Yellow:
-        return BACKGROUND_RED | BACKGROUND_GREEN;
-    case ConsoleBackgroundColor::None:
-        return 0;
-    default:
-        return 0;
-    }
-}
-#else
-// Get the ANSI escape code for a given ConsoleBackgroundColor
-inline std::string GetBackgroundColorCode(ConsoleBackgroundColor color)
-{
-    switch (color) {
-    case ConsoleBackgroundColor::Green:
-        return "\033[42m";
-    case ConsoleBackgroundColor::Black:
-        return "\033[40m";
-    case ConsoleBackgroundColor::Blue:
-        return "\033[44m";
-    case ConsoleBackgroundColor::Gray:
-        return "\033[40m";
-    case ConsoleBackgroundColor::Purple:
-        return "\033[45m";
-    case ConsoleBackgroundColor::Red:
-        return "\033[41m";
-    case ConsoleBackgroundColor::White:
-        return "\033[47m";
-    case ConsoleBackgroundColor::Cyan:
-        return "\033[46m";
-    case ConsoleBackgroundColor::Yellow:
-        return "\033[43m";
-    case ConsoleBackgroundColor::None:
-        return "\033[40m";
-    default:
-        return 0;
-    }
-}
-#endif
-
-// Operator overloading for console text color
-inline std::ostream& operator<<(std::ostream& os, ConsoleColor data)
-{
-#if defined(_WIN32)
-    HANDLE handle = GetStdHandle(STD_OUTPUT_HANDLE);
-    SetConsoleTextAttribute(handle, GetColorCode(data));
-#else
-    std::cout << GetColorCode(data);
-#endif
-    return os;
-}
-
-// Operator overloading for console background color
-inline std::ostream& operator<<(std::ostream& os, ConsoleBackgroundColor data)
-{
-#if defined(_WIN32)
-    HANDLE handle = GetStdHandle(STD_OUTPUT_HANDLE);
-    SetConsoleTextAttribute(handle, GetBackgroundColorCode(data));
-#else
-    std::cout << GetBackgroundColorCode(data);
-#endif
-    return os;
-}

3rd/spdlog/async.h

@@ -0,0 +1,100 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+//
+// Async logging using global thread pool
+// All loggers created here share same global thread pool.
+// Each log message is pushed to a queue along with a shared pointer to the
+// logger.
+// If a logger deleted while having pending messages in the queue, it's actual
+// destruction will defer
+// until all its messages are processed by the thread pool.
+// This is because each message in the queue holds a shared_ptr to the
+// originating logger.
+
+#include <spdlog/async_logger.h>
+#include <spdlog/details/registry.h>
+#include <spdlog/details/thread_pool.h>
+
+#include <functional>
+#include <memory>
+#include <mutex>
+
+namespace spdlog {
+
+namespace details {
+static const size_t default_async_q_size = 8192;
+}
+
+// async logger factory - creates async loggers backed with thread pool.
+// if a global thread pool doesn't already exist, create it with default queue
+// size of 8192 items and single thread.
+template <async_overflow_policy OverflowPolicy = async_overflow_policy::block>
+struct async_factory_impl {
+    template <typename Sink, typename... SinkArgs>
+    static std::shared_ptr<async_logger> create(std::string logger_name, SinkArgs &&...args) {
+        auto &registry_inst = details::registry::instance();
+
+        // create global thread pool if not already exists..
+
+        auto &mutex = registry_inst.tp_mutex();
+        std::lock_guard<std::recursive_mutex> tp_lock(mutex);
+        auto tp = registry_inst.get_tp();
+        if (tp == nullptr) {
+            tp = std::make_shared<details::thread_pool>(details::default_async_q_size, 1U);
+            registry_inst.set_tp(tp);
+        }
+
+        auto sink = std::make_shared<Sink>(std::forward<SinkArgs>(args)...);
+        auto new_logger = std::make_shared<async_logger>(std::move(logger_name), std::move(sink),
+                                                         std::move(tp), OverflowPolicy);
+        registry_inst.initialize_logger(new_logger);
+        return new_logger;
+    }
+};
+
+using async_factory = async_factory_impl<async_overflow_policy::block>;
+using async_factory_nonblock = async_factory_impl<async_overflow_policy::overrun_oldest>;
+
+template <typename Sink, typename... SinkArgs>
+inline std::shared_ptr<spdlog::logger> create_async(std::string logger_name,
+                                                    SinkArgs &&...sink_args) {
+    return async_factory::create<Sink>(std::move(logger_name),
+                                       std::forward<SinkArgs>(sink_args)...);
+}
+
+template <typename Sink, typename... SinkArgs>
+inline std::shared_ptr<spdlog::logger> create_async_nb(std::string logger_name,
+                                                       SinkArgs &&...sink_args) {
+    return async_factory_nonblock::create<Sink>(std::move(logger_name),
+                                                std::forward<SinkArgs>(sink_args)...);
+}
+
+// set global thread pool.
+inline void init_thread_pool(size_t q_size,
+                             size_t thread_count,
+                             std::function<void()> on_thread_start,
+                             std::function<void()> on_thread_stop) {
+    auto tp = std::make_shared<details::thread_pool>(q_size, thread_count, on_thread_start,
+                                                     on_thread_stop);
+    details::registry::instance().set_tp(std::move(tp));
+}
+
+inline void init_thread_pool(size_t q_size,
+                             size_t thread_count,
+                             std::function<void()> on_thread_start) {
+    init_thread_pool(q_size, thread_count, on_thread_start, [] {});
+}
+
+inline void init_thread_pool(size_t q_size, size_t thread_count) {
+    init_thread_pool(
+        q_size, thread_count, [] {}, [] {});
+}
+
+// get the global thread pool.
+inline std::shared_ptr<spdlog::details::thread_pool> thread_pool() {
+    return details::registry::instance().get_tp();
+}
+}  // namespace spdlog

3rd/spdlog/async_logger-inl.h

@@ -0,0 +1,84 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/async_logger.h>
+#endif
+
+#include <spdlog/details/thread_pool.h>
+#include <spdlog/sinks/sink.h>
+
+#include <memory>
+#include <string>
+
+SPDLOG_INLINE spdlog::async_logger::async_logger(std::string logger_name,
+                                                 sinks_init_list sinks_list,
+                                                 std::weak_ptr<details::thread_pool> tp,
+                                                 async_overflow_policy overflow_policy)
+    : async_logger(std::move(logger_name),
+                   sinks_list.begin(),
+                   sinks_list.end(),
+                   std::move(tp),
+                   overflow_policy) {}
+
+SPDLOG_INLINE spdlog::async_logger::async_logger(std::string logger_name,
+                                                 sink_ptr single_sink,
+                                                 std::weak_ptr<details::thread_pool> tp,
+                                                 async_overflow_policy overflow_policy)
+    : async_logger(
+          std::move(logger_name), {std::move(single_sink)}, std::move(tp), overflow_policy) {}
+
+// send the log message to the thread pool
+SPDLOG_INLINE void spdlog::async_logger::sink_it_(const details::log_msg &msg){
+    SPDLOG_TRY{if (auto pool_ptr = thread_pool_.lock()){
+        pool_ptr->post_log(shared_from_this(), msg, overflow_policy_);
+}
+else {
+    throw_spdlog_ex("async log: thread pool doesn't exist anymore");
+}
+}
+SPDLOG_LOGGER_CATCH(msg.source)
+}
+
+// send flush request to the thread pool
+SPDLOG_INLINE void spdlog::async_logger::flush_(){
+    SPDLOG_TRY{if (auto pool_ptr = thread_pool_.lock()){
+        pool_ptr->post_flush(shared_from_this(), overflow_policy_);
+}
+else {
+    throw_spdlog_ex("async flush: thread pool doesn't exist anymore");
+}
+}
+SPDLOG_LOGGER_CATCH(source_loc())
+}
+
+//
+// backend functions - called from the thread pool to do the actual job
+//
+SPDLOG_INLINE void spdlog::async_logger::backend_sink_it_(const details::log_msg &msg) {
+    for (auto &sink : sinks_) {
+        if (sink->should_log(msg.level)) {
+            SPDLOG_TRY { sink->log(msg); }
+            SPDLOG_LOGGER_CATCH(msg.source)
+        }
+    }
+
+    if (should_flush_(msg)) {
+        backend_flush_();
+    }
+}
+
+SPDLOG_INLINE void spdlog::async_logger::backend_flush_() {
+    for (auto &sink : sinks_) {
+        SPDLOG_TRY { sink->flush(); }
+        SPDLOG_LOGGER_CATCH(source_loc())
+    }
+}
+
+SPDLOG_INLINE std::shared_ptr<spdlog::logger> spdlog::async_logger::clone(std::string new_name) {
+    auto cloned = std::make_shared<spdlog::async_logger>(*this);
+    cloned->name_ = std::move(new_name);
+    return cloned;
+}

3rd/spdlog/async_logger.h

@@ -0,0 +1,74 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+// Fast asynchronous logger.
+// Uses pre allocated queue.
+// Creates a single back thread to pop messages from the queue and log them.
+//
+// Upon each log write the logger:
+//    1. Checks if its log level is enough to log the message
+//    2. Push a new copy of the message to a queue (or block the caller until
+//    space is available in the queue)
+// Upon destruction, logs all remaining messages in the queue before
+// destructing..
+
+#include <spdlog/logger.h>
+
+namespace spdlog {
+
+// Async overflow policy - block by default.
+enum class async_overflow_policy {
+    block,           // Block until message can be enqueued
+    overrun_oldest,  // Discard oldest message in the queue if full when trying to
+                     // add new item.
+    discard_new      // Discard new message if the queue is full when trying to add new item.
+};
+
+namespace details {
+class thread_pool;
+}
+
+class SPDLOG_API async_logger final : public std::enable_shared_from_this<async_logger>,
+                                      public logger {
+    friend class details::thread_pool;
+
+public:
+    template <typename It>
+    async_logger(std::string logger_name,
+                 It begin,
+                 It end,
+                 std::weak_ptr<details::thread_pool> tp,
+                 async_overflow_policy overflow_policy = async_overflow_policy::block)
+        : logger(std::move(logger_name), begin, end),
+          thread_pool_(std::move(tp)),
+          overflow_policy_(overflow_policy) {}
+
+    async_logger(std::string logger_name,
+                 sinks_init_list sinks_list,
+                 std::weak_ptr<details::thread_pool> tp,
+                 async_overflow_policy overflow_policy = async_overflow_policy::block);
+
+    async_logger(std::string logger_name,
+                 sink_ptr single_sink,
+                 std::weak_ptr<details::thread_pool> tp,
+                 async_overflow_policy overflow_policy = async_overflow_policy::block);
+
+    std::shared_ptr<logger> clone(std::string new_name) override;
+
+protected:
+    void sink_it_(const details::log_msg &msg) override;
+    void flush_() override;
+    void backend_sink_it_(const details::log_msg &incoming_log_msg);
+    void backend_flush_();
+
+private:
+    std::weak_ptr<details::thread_pool> thread_pool_;
+    async_overflow_policy overflow_policy_;
+};
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "async_logger-inl.h"
+#endif

3rd/spdlog/cfg/argv.h

@@ -0,0 +1,40 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+#include <spdlog/cfg/helpers.h>
+#include <spdlog/details/registry.h>
+
+//
+// Init log levels using each argv entry that starts with "SPDLOG_LEVEL="
+//
+// set all loggers to debug level:
+// example.exe "SPDLOG_LEVEL=debug"
+
+// set logger1 to trace level
+// example.exe "SPDLOG_LEVEL=logger1=trace"
+
+// turn off all logging except for logger1 and logger2:
+// example.exe "SPDLOG_LEVEL=off,logger1=debug,logger2=info"
+
+namespace spdlog {
+namespace cfg {
+
+// search for SPDLOG_LEVEL= in the args and use it to init the levels
+inline void load_argv_levels(int argc, const char **argv) {
+    const std::string spdlog_level_prefix = "SPDLOG_LEVEL=";
+    for (int i = 1; i < argc; i++) {
+        std::string arg = argv[i];
+        if (arg.find(spdlog_level_prefix) == 0) {
+            auto levels_string = arg.substr(spdlog_level_prefix.size());
+            helpers::load_levels(levels_string);
+        }
+    }
+}
+
+inline void load_argv_levels(int argc, char **argv) {
+    load_argv_levels(argc, const_cast<const char **>(argv));
+}
+
+}  // namespace cfg
+}  // namespace spdlog

3rd/spdlog/cfg/env.h

@@ -0,0 +1,36 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+#include <spdlog/cfg/helpers.h>
+#include <spdlog/details/os.h>
+#include <spdlog/details/registry.h>
+
+//
+// Init levels and patterns from env variables SPDLOG_LEVEL
+// Inspired from Rust's "env_logger" crate (https://crates.io/crates/env_logger).
+// Note - fallback to "info" level on unrecognized levels
+//
+// Examples:
+//
+// set global level to debug:
+// export SPDLOG_LEVEL=debug
+//
+// turn off all logging except for logger1:
+// export SPDLOG_LEVEL="*=off,logger1=debug"
+//
+
+// turn off all logging except for logger1 and logger2:
+// export SPDLOG_LEVEL="off,logger1=debug,logger2=info"
+
+namespace spdlog {
+namespace cfg {
+inline void load_env_levels() {
+    auto env_val = details::os::getenv("SPDLOG_LEVEL");
+    if (!env_val.empty()) {
+        helpers::load_levels(env_val);
+    }
+}
+
+}  // namespace cfg
+}  // namespace spdlog

3rd/spdlog/cfg/helpers-inl.h

@@ -0,0 +1,107 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/cfg/helpers.h>
+#endif
+
+#include <spdlog/details/os.h>
+#include <spdlog/details/registry.h>
+#include <spdlog/spdlog.h>
+
+#include <algorithm>
+#include <sstream>
+#include <string>
+#include <utility>
+
+namespace spdlog {
+namespace cfg {
+namespace helpers {
+
+// inplace convert to lowercase
+inline std::string &to_lower_(std::string &str) {
+    std::transform(str.begin(), str.end(), str.begin(), [](char ch) {
+        return static_cast<char>((ch >= 'A' && ch <= 'Z') ? ch + ('a' - 'A') : ch);
+    });
+    return str;
+}
+
+// inplace trim spaces
+inline std::string &trim_(std::string &str) {
+    const char *spaces = " \n\r\t";
+    str.erase(str.find_last_not_of(spaces) + 1);
+    str.erase(0, str.find_first_not_of(spaces));
+    return str;
+}
+
+// return (name,value) trimmed pair from given "name=value" string.
+// return empty string on missing parts
+// "key=val" => ("key", "val")
+// " key  =  val " => ("key", "val")
+// "key=" => ("key", "")
+// "val" => ("", "val")
+
+inline std::pair<std::string, std::string> extract_kv_(char sep, const std::string &str) {
+    auto n = str.find(sep);
+    std::string k, v;
+    if (n == std::string::npos) {
+        v = str;
+    } else {
+        k = str.substr(0, n);
+        v = str.substr(n + 1);
+    }
+    return std::make_pair(trim_(k), trim_(v));
+}
+
+// return vector of key/value pairs from sequence of "K1=V1,K2=V2,.."
+// "a=AAA,b=BBB,c=CCC,.." => {("a","AAA"),("b","BBB"),("c", "CCC"),...}
+inline std::unordered_map<std::string, std::string> extract_key_vals_(const std::string &str) {
+    std::string token;
+    std::istringstream token_stream(str);
+    std::unordered_map<std::string, std::string> rv{};
+    while (std::getline(token_stream, token, ',')) {
+        if (token.empty()) {
+            continue;
+        }
+        auto kv = extract_kv_('=', token);
+        rv[kv.first] = kv.second;
+    }
+    return rv;
+}
+
+SPDLOG_INLINE void load_levels(const std::string &input) {
+    if (input.empty() || input.size() > 512) {
+        return;
+    }
+
+    auto key_vals = extract_key_vals_(input);
+    std::unordered_map<std::string, level::level_enum> levels;
+    level::level_enum global_level = level::info;
+    bool global_level_found = false;
+
+    for (auto &name_level : key_vals) {
+        auto &logger_name = name_level.first;
+        auto level_name = to_lower_(name_level.second);
+        auto level = level::from_str(level_name);
+        // ignore unrecognized level names
+        if (level == level::off && level_name != "off") {
+            continue;
+        }
+        if (logger_name.empty())  // no logger name indicate global level
+        {
+            global_level_found = true;
+            global_level = level;
+        } else {
+            levels[logger_name] = level;
+        }
+    }
+
+    details::registry::instance().set_levels(std::move(levels),
+                                             global_level_found ? &global_level : nullptr);
+}
+
+}  // namespace helpers
+}  // namespace cfg
+}  // namespace spdlog

3rd/spdlog/cfg/helpers.h

@@ -0,0 +1,29 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/common.h>
+#include <unordered_map>
+
+namespace spdlog {
+namespace cfg {
+namespace helpers {
+//
+// Init levels from given string
+//
+// Examples:
+//
+// set global level to debug: "debug"
+// turn off all logging except for logger1: "off,logger1=debug"
+// turn off all logging except for logger1 and logger2: "off,logger1=debug,logger2=info"
+//
+SPDLOG_API void load_levels(const std::string &txt);
+}  // namespace helpers
+
+}  // namespace cfg
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "helpers-inl.h"
+#endif  // SPDLOG_HEADER_ONLY

3rd/spdlog/common-inl.h

@@ -0,0 +1,68 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/common.h>
+#endif
+
+#include <algorithm>
+#include <iterator>
+
+namespace spdlog {
+namespace level {
+
+#if __cplusplus >= 201703L
+constexpr
+#endif
+    static string_view_t level_string_views[] SPDLOG_LEVEL_NAMES;
+
+static const char *short_level_names[] SPDLOG_SHORT_LEVEL_NAMES;
+
+SPDLOG_INLINE const string_view_t &to_string_view(spdlog::level::level_enum l) SPDLOG_NOEXCEPT {
+    return level_string_views[l];
+}
+
+SPDLOG_INLINE const char *to_short_c_str(spdlog::level::level_enum l) SPDLOG_NOEXCEPT {
+    return short_level_names[l];
+}
+
+SPDLOG_INLINE spdlog::level::level_enum from_str(const std::string &name) SPDLOG_NOEXCEPT {
+    auto it = std::find(std::begin(level_string_views), std::end(level_string_views), name);
+    if (it != std::end(level_string_views))
+        return static_cast<level::level_enum>(std::distance(std::begin(level_string_views), it));
+
+    // check also for "warn" and "err" before giving up..
+    if (name == "warn") {
+        return level::warn;
+    }
+    if (name == "err") {
+        return level::err;
+    }
+    return level::off;
+}
+}  // namespace level
+
+SPDLOG_INLINE spdlog_ex::spdlog_ex(std::string msg)
+    : msg_(std::move(msg)) {}
+
+SPDLOG_INLINE spdlog_ex::spdlog_ex(const std::string &msg, int last_errno) {
+#ifdef SPDLOG_USE_STD_FORMAT
+    msg_ = std::system_error(std::error_code(last_errno, std::generic_category()), msg).what();
+#else
+    memory_buf_t outbuf;
+    fmt::format_system_error(outbuf, last_errno, msg.c_str());
+    msg_ = fmt::to_string(outbuf);
+#endif
+}
+
+SPDLOG_INLINE const char *spdlog_ex::what() const SPDLOG_NOEXCEPT { return msg_.c_str(); }
+
+SPDLOG_INLINE void throw_spdlog_ex(const std::string &msg, int last_errno) {
+    SPDLOG_THROW(spdlog_ex(msg, last_errno));
+}
+
+SPDLOG_INLINE void throw_spdlog_ex(std::string msg) { SPDLOG_THROW(spdlog_ex(std::move(msg))); }
+
+}  // namespace spdlog

3rd/spdlog/common.h

@@ -0,0 +1,411 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/tweakme.h>
+
+#include <atomic>
+#include <chrono>
+#include <cstdio>
+#include <exception>
+#include <functional>
+#include <initializer_list>
+#include <memory>
+#include <string>
+#include <type_traits>
+
+#ifdef SPDLOG_USE_STD_FORMAT
+    #include <version>
+    #if __cpp_lib_format >= 202207L
+        #include <format>
+    #else
+        #include <string_view>
+    #endif
+#endif
+
+#ifdef SPDLOG_COMPILED_LIB
+    #undef SPDLOG_HEADER_ONLY
+    #if defined(SPDLOG_SHARED_LIB)
+        #if defined(_WIN32)
+            #ifdef spdlog_EXPORTS
+                #define SPDLOG_API __declspec(dllexport)
+            #else  // !spdlog_EXPORTS
+                #define SPDLOG_API __declspec(dllimport)
+            #endif
+        #else  // !defined(_WIN32)
+            #define SPDLOG_API __attribute__((visibility("default")))
+        #endif
+    #else  // !defined(SPDLOG_SHARED_LIB)
+        #define SPDLOG_API
+    #endif
+    #define SPDLOG_INLINE
+#else  // !defined(SPDLOG_COMPILED_LIB)
+    #define SPDLOG_API
+    #define SPDLOG_HEADER_ONLY
+    #define SPDLOG_INLINE inline
+#endif  // #ifdef SPDLOG_COMPILED_LIB
+
+#include <spdlog/fmt/fmt.h>
+
+#if !defined(SPDLOG_USE_STD_FORMAT) && \
+    FMT_VERSION >= 80000  // backward compatibility with fmt versions older than 8
+    #define SPDLOG_FMT_RUNTIME(format_string) fmt::runtime(format_string)
+    #define SPDLOG_FMT_STRING(format_string) FMT_STRING(format_string)
+    #if defined(SPDLOG_WCHAR_FILENAMES) || defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
+        #include <spdlog/fmt/xchar.h>
+    #endif
+#else
+    #define SPDLOG_FMT_RUNTIME(format_string) format_string
+    #define SPDLOG_FMT_STRING(format_string) format_string
+#endif
+
+// visual studio up to 2013 does not support noexcept nor constexpr
+#if defined(_MSC_VER) && (_MSC_VER < 1900)
+    #define SPDLOG_NOEXCEPT _NOEXCEPT
+    #define SPDLOG_CONSTEXPR
+#else
+    #define SPDLOG_NOEXCEPT noexcept
+    #define SPDLOG_CONSTEXPR constexpr
+#endif
+
+// If building with std::format, can just use constexpr, otherwise if building with fmt
+// SPDLOG_CONSTEXPR_FUNC needs to be set the same as FMT_CONSTEXPR to avoid situations where
+// a constexpr function in spdlog could end up calling a non-constexpr function in fmt
+// depending on the compiler
+// If fmt determines it can't use constexpr, we should inline the function instead
+#ifdef SPDLOG_USE_STD_FORMAT
+    #define SPDLOG_CONSTEXPR_FUNC constexpr
+#else  // Being built with fmt
+    #if FMT_USE_CONSTEXPR
+        #define SPDLOG_CONSTEXPR_FUNC FMT_CONSTEXPR
+    #else
+        #define SPDLOG_CONSTEXPR_FUNC inline
+    #endif
+#endif
+
+#if defined(__GNUC__) || defined(__clang__)
+    #define SPDLOG_DEPRECATED __attribute__((deprecated))
+#elif defined(_MSC_VER)
+    #define SPDLOG_DEPRECATED __declspec(deprecated)
+#else
+    #define SPDLOG_DEPRECATED
+#endif
+
+// disable thread local on msvc 2013
+#ifndef SPDLOG_NO_TLS
+    #if (defined(_MSC_VER) && (_MSC_VER < 1900)) || defined(__cplusplus_winrt)
+        #define SPDLOG_NO_TLS 1
+    #endif
+#endif
+
+#ifndef SPDLOG_FUNCTION
+    #define SPDLOG_FUNCTION static_cast<const char *>(__FUNCTION__)
+#endif
+
+#ifdef SPDLOG_NO_EXCEPTIONS
+    #define SPDLOG_TRY
+    #define SPDLOG_THROW(ex)                               \
+        do {                                               \
+            printf("spdlog fatal error: %s\n", ex.what()); \
+            std::abort();                                  \
+        } while (0)
+    #define SPDLOG_CATCH_STD
+#else
+    #define SPDLOG_TRY try
+    #define SPDLOG_THROW(ex) throw(ex)
+    #define SPDLOG_CATCH_STD             \
+        catch (const std::exception &) { \
+        }
+#endif
+
+namespace spdlog {
+
+class formatter;
+
+namespace sinks {
+class sink;
+}
+
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+using filename_t = std::wstring;
+    // allow macro expansion to occur in SPDLOG_FILENAME_T
+    #define SPDLOG_FILENAME_T_INNER(s) L##s
+    #define SPDLOG_FILENAME_T(s) SPDLOG_FILENAME_T_INNER(s)
+#else
+using filename_t = std::string;
+    #define SPDLOG_FILENAME_T(s) s
+#endif
+
+using log_clock = std::chrono::system_clock;
+using sink_ptr = std::shared_ptr<sinks::sink>;
+using sinks_init_list = std::initializer_list<sink_ptr>;
+using err_handler = std::function<void(const std::string &err_msg)>;
+#ifdef SPDLOG_USE_STD_FORMAT
+namespace fmt_lib = std;
+
+using string_view_t = std::string_view;
+using memory_buf_t = std::string;
+
+template <typename... Args>
+    #if __cpp_lib_format >= 202207L
+using format_string_t = std::format_string<Args...>;
+    #else
+using format_string_t = std::string_view;
+    #endif
+
+template <class T, class Char = char>
+struct is_convertible_to_basic_format_string
+    : std::integral_constant<bool, std::is_convertible<T, std::basic_string_view<Char>>::value> {};
+
+    #if defined(SPDLOG_WCHAR_FILENAMES) || defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
+using wstring_view_t = std::wstring_view;
+using wmemory_buf_t = std::wstring;
+
+template <typename... Args>
+        #if __cpp_lib_format >= 202207L
+using wformat_string_t = std::wformat_string<Args...>;
+        #else
+using wformat_string_t = std::wstring_view;
+        #endif
+    #endif
+    #define SPDLOG_BUF_TO_STRING(x) x
+#else  // use fmt lib instead of std::format
+namespace fmt_lib = fmt;
+
+using string_view_t = fmt::basic_string_view<char>;
+using memory_buf_t = fmt::basic_memory_buffer<char, 250>;
+
+template <typename... Args>
+using format_string_t = fmt::format_string<Args...>;
+
+template <class T>
+using remove_cvref_t = typename std::remove_cv<typename std::remove_reference<T>::type>::type;
+
+template <typename Char>
+    #if FMT_VERSION >= 90101
+using fmt_runtime_string = fmt::runtime_format_string<Char>;
+    #else
+using fmt_runtime_string = fmt::basic_runtime<Char>;
+    #endif
+
+// clang doesn't like SFINAE disabled constructor in std::is_convertible<> so have to repeat the
+// condition from basic_format_string here, in addition, fmt::basic_runtime<Char> is only
+// convertible to basic_format_string<Char> but not basic_string_view<Char>
+template <class T, class Char = char>
+struct is_convertible_to_basic_format_string
+    : std::integral_constant<bool,
+                             std::is_convertible<T, fmt::basic_string_view<Char>>::value ||
+                                 std::is_same<remove_cvref_t<T>, fmt_runtime_string<Char>>::value> {
+};
+
+    #if defined(SPDLOG_WCHAR_FILENAMES) || defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
+using wstring_view_t = fmt::basic_string_view<wchar_t>;
+using wmemory_buf_t = fmt::basic_memory_buffer<wchar_t, 250>;
+
+template <typename... Args>
+using wformat_string_t = fmt::wformat_string<Args...>;
+    #endif
+    #define SPDLOG_BUF_TO_STRING(x) fmt::to_string(x)
+#endif
+
+#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
+    #ifndef _WIN32
+        #error SPDLOG_WCHAR_TO_UTF8_SUPPORT only supported on windows
+    #endif  // _WIN32
+#endif      // SPDLOG_WCHAR_TO_UTF8_SUPPORT
+
+template <class T>
+struct is_convertible_to_any_format_string
+    : std::integral_constant<bool,
+                             is_convertible_to_basic_format_string<T, char>::value ||
+                                 is_convertible_to_basic_format_string<T, wchar_t>::value> {};
+
+#if defined(SPDLOG_NO_ATOMIC_LEVELS)
+using level_t = details::null_atomic_int;
+#else
+using level_t = std::atomic<int>;
+#endif
+
+#define SPDLOG_LEVEL_TRACE 0
+#define SPDLOG_LEVEL_DEBUG 1
+#define SPDLOG_LEVEL_INFO 2
+#define SPDLOG_LEVEL_WARN 3
+#define SPDLOG_LEVEL_ERROR 4
+#define SPDLOG_LEVEL_CRITICAL 5
+#define SPDLOG_LEVEL_OFF 6
+
+#if !defined(SPDLOG_ACTIVE_LEVEL)
+    #define SPDLOG_ACTIVE_LEVEL SPDLOG_LEVEL_INFO
+#endif
+
+// Log level enum
+namespace level {
+enum level_enum : int {
+    trace = SPDLOG_LEVEL_TRACE,
+    debug = SPDLOG_LEVEL_DEBUG,
+    info = SPDLOG_LEVEL_INFO,
+    warn = SPDLOG_LEVEL_WARN,
+    err = SPDLOG_LEVEL_ERROR,
+    critical = SPDLOG_LEVEL_CRITICAL,
+    off = SPDLOG_LEVEL_OFF,
+    n_levels
+};
+
+#define SPDLOG_LEVEL_NAME_TRACE spdlog::string_view_t("trace", 5)
+#define SPDLOG_LEVEL_NAME_DEBUG spdlog::string_view_t("debug", 5)
+#define SPDLOG_LEVEL_NAME_INFO spdlog::string_view_t("info", 4)
+#define SPDLOG_LEVEL_NAME_WARNING spdlog::string_view_t("warning", 7)
+#define SPDLOG_LEVEL_NAME_ERROR spdlog::string_view_t("error", 5)
+#define SPDLOG_LEVEL_NAME_CRITICAL spdlog::string_view_t("critical", 8)
+#define SPDLOG_LEVEL_NAME_OFF spdlog::string_view_t("off", 3)
+
+#if !defined(SPDLOG_LEVEL_NAMES)
+    #define SPDLOG_LEVEL_NAMES                                                                  \
+        {                                                                                       \
+            SPDLOG_LEVEL_NAME_TRACE, SPDLOG_LEVEL_NAME_DEBUG, SPDLOG_LEVEL_NAME_INFO,           \
+                SPDLOG_LEVEL_NAME_WARNING, SPDLOG_LEVEL_NAME_ERROR, SPDLOG_LEVEL_NAME_CRITICAL, \
+                SPDLOG_LEVEL_NAME_OFF                                                           \
+        }
+#endif
+
+#if !defined(SPDLOG_SHORT_LEVEL_NAMES)
+
+    #define SPDLOG_SHORT_LEVEL_NAMES \
+        { "T", "D", "I", "W", "E", "C", "O" }
+#endif
+
+SPDLOG_API const string_view_t &to_string_view(spdlog::level::level_enum l) SPDLOG_NOEXCEPT;
+SPDLOG_API const char *to_short_c_str(spdlog::level::level_enum l) SPDLOG_NOEXCEPT;
+SPDLOG_API spdlog::level::level_enum from_str(const std::string &name) SPDLOG_NOEXCEPT;
+
+}  // namespace level
+
+//
+// Color mode used by sinks with color support.
+//
+enum class color_mode { always, automatic, never };
+
+//
+// Pattern time - specific time getting to use for pattern_formatter.
+// local time by default
+//
+enum class pattern_time_type {
+    local,  // log localtime
+    utc     // log utc
+};
+
+//
+// Log exception
+//
+class SPDLOG_API spdlog_ex : public std::exception {
+public:
+    explicit spdlog_ex(std::string msg);
+    spdlog_ex(const std::string &msg, int last_errno);
+    const char *what() const SPDLOG_NOEXCEPT override;
+
+private:
+    std::string msg_;
+};
+
+[[noreturn]] SPDLOG_API void throw_spdlog_ex(const std::string &msg, int last_errno);
+[[noreturn]] SPDLOG_API void throw_spdlog_ex(std::string msg);
+
+struct source_loc {
+    SPDLOG_CONSTEXPR source_loc() = default;
+    SPDLOG_CONSTEXPR source_loc(const char *filename_in, int line_in, const char *funcname_in)
+        : filename{filename_in},
+          line{line_in},
+          funcname{funcname_in} {}
+
+    SPDLOG_CONSTEXPR bool empty() const SPDLOG_NOEXCEPT { return line <= 0; }
+    const char *filename{nullptr};
+    int line{0};
+    const char *funcname{nullptr};
+};
+
+struct file_event_handlers {
+    file_event_handlers()
+        : before_open(nullptr),
+          after_open(nullptr),
+          before_close(nullptr),
+          after_close(nullptr) {}
+
+    std::function<void(const filename_t &filename)> before_open;
+    std::function<void(const filename_t &filename, std::FILE *file_stream)> after_open;
+    std::function<void(const filename_t &filename, std::FILE *file_stream)> before_close;
+    std::function<void(const filename_t &filename)> after_close;
+};
+
+namespace details {
+
+// to_string_view
+
+SPDLOG_CONSTEXPR_FUNC spdlog::string_view_t to_string_view(const memory_buf_t &buf)
+    SPDLOG_NOEXCEPT {
+    return spdlog::string_view_t{buf.data(), buf.size()};
+}
+
+SPDLOG_CONSTEXPR_FUNC spdlog::string_view_t to_string_view(spdlog::string_view_t str)
+    SPDLOG_NOEXCEPT {
+    return str;
+}
+
+#if defined(SPDLOG_WCHAR_FILENAMES) || defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
+SPDLOG_CONSTEXPR_FUNC spdlog::wstring_view_t to_string_view(const wmemory_buf_t &buf)
+    SPDLOG_NOEXCEPT {
+    return spdlog::wstring_view_t{buf.data(), buf.size()};
+}
+
+SPDLOG_CONSTEXPR_FUNC spdlog::wstring_view_t to_string_view(spdlog::wstring_view_t str)
+    SPDLOG_NOEXCEPT {
+    return str;
+}
+#endif
+
+#ifndef SPDLOG_USE_STD_FORMAT
+template <typename T, typename... Args>
+inline fmt::basic_string_view<T> to_string_view(fmt::basic_format_string<T, Args...> fmt) {
+    return fmt;
+}
+#elif __cpp_lib_format >= 202207L
+template <typename T, typename... Args>
+SPDLOG_CONSTEXPR_FUNC std::basic_string_view<T> to_string_view(
+    std::basic_format_string<T, Args...> fmt) SPDLOG_NOEXCEPT {
+    return fmt.get();
+}
+#endif
+
+// make_unique support for pre c++14
+#if __cplusplus >= 201402L  // C++14 and beyond
+using std::enable_if_t;
+using std::make_unique;
+#else
+template <bool B, class T = void>
+using enable_if_t = typename std::enable_if<B, T>::type;
+
+template <typename T, typename... Args>
+std::unique_ptr<T> make_unique(Args &&...args) {
+    static_assert(!std::is_array<T>::value, "arrays not supported");
+    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+}
+#endif
+
+// to avoid useless casts (see https://github.com/nlohmann/json/issues/2893#issuecomment-889152324)
+template <typename T, typename U, enable_if_t<!std::is_same<T, U>::value, int> = 0>
+constexpr T conditional_static_cast(U value) {
+    return static_cast<T>(value);
+}
+
+template <typename T, typename U, enable_if_t<std::is_same<T, U>::value, int> = 0>
+constexpr T conditional_static_cast(U value) {
+    return value;
+}
+
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "common-inl.h"
+#endif

3rd/spdlog/details/backtracer-inl.h

@@ -0,0 +1,63 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/backtracer.h>
+#endif
+namespace spdlog {
+namespace details {
+SPDLOG_INLINE backtracer::backtracer(const backtracer &other) {
+    std::lock_guard<std::mutex> lock(other.mutex_);
+    enabled_ = other.enabled();
+    messages_ = other.messages_;
+}
+
+SPDLOG_INLINE backtracer::backtracer(backtracer &&other) SPDLOG_NOEXCEPT {
+    std::lock_guard<std::mutex> lock(other.mutex_);
+    enabled_ = other.enabled();
+    messages_ = std::move(other.messages_);
+}
+
+SPDLOG_INLINE backtracer &backtracer::operator=(backtracer other) {
+    std::lock_guard<std::mutex> lock(mutex_);
+    enabled_ = other.enabled();
+    messages_ = std::move(other.messages_);
+    return *this;
+}
+
+SPDLOG_INLINE void backtracer::enable(size_t size) {
+    std::lock_guard<std::mutex> lock{mutex_};
+    enabled_.store(true, std::memory_order_relaxed);
+    messages_ = circular_q<log_msg_buffer>{size};
+}
+
+SPDLOG_INLINE void backtracer::disable() {
+    std::lock_guard<std::mutex> lock{mutex_};
+    enabled_.store(false, std::memory_order_relaxed);
+}
+
+SPDLOG_INLINE bool backtracer::enabled() const { return enabled_.load(std::memory_order_relaxed); }
+
+SPDLOG_INLINE void backtracer::push_back(const log_msg &msg) {
+    std::lock_guard<std::mutex> lock{mutex_};
+    messages_.push_back(log_msg_buffer{msg});
+}
+
+SPDLOG_INLINE bool backtracer::empty() const {
+    std::lock_guard<std::mutex> lock{mutex_};
+    return messages_.empty();
+}
+
+// pop all items in the q and apply the given fun on each of them.
+SPDLOG_INLINE void backtracer::foreach_pop(std::function<void(const details::log_msg &)> fun) {
+    std::lock_guard<std::mutex> lock{mutex_};
+    while (!messages_.empty()) {
+        auto &front_msg = messages_.front();
+        fun(front_msg);
+        messages_.pop_front();
+    }
+}
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/backtracer.h

@@ -0,0 +1,45 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/circular_q.h>
+#include <spdlog/details/log_msg_buffer.h>
+
+#include <atomic>
+#include <functional>
+#include <mutex>
+
+// Store log messages in circular buffer.
+// Useful for storing debug data in case of error/warning happens.
+
+namespace spdlog {
+namespace details {
+class SPDLOG_API backtracer {
+    mutable std::mutex mutex_;
+    std::atomic<bool> enabled_{false};
+    circular_q<log_msg_buffer> messages_;
+
+public:
+    backtracer() = default;
+    backtracer(const backtracer &other);
+
+    backtracer(backtracer &&other) SPDLOG_NOEXCEPT;
+    backtracer &operator=(backtracer other);
+
+    void enable(size_t size);
+    void disable();
+    bool enabled() const;
+    void push_back(const log_msg &msg);
+    bool empty() const;
+
+    // pop all items in the q and apply the given fun on each of them.
+    void foreach_pop(std::function<void(const details::log_msg &)> fun);
+};
+
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "backtracer-inl.h"
+#endif

3rd/spdlog/details/circular_q.h

@@ -0,0 +1,115 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+// circular q view of std::vector.
+#pragma once
+
+#include <cassert>
+#include <vector>
+
+#include "spdlog/common.h"
+
+namespace spdlog {
+namespace details {
+template <typename T>
+class circular_q {
+    size_t max_items_ = 0;
+    typename std::vector<T>::size_type head_ = 0;
+    typename std::vector<T>::size_type tail_ = 0;
+    size_t overrun_counter_ = 0;
+    std::vector<T> v_;
+
+public:
+    using value_type = T;
+
+    // empty ctor - create a disabled queue with no elements allocated at all
+    circular_q() = default;
+
+    explicit circular_q(size_t max_items)
+        : max_items_(max_items + 1)  // one item is reserved as marker for full q
+          ,
+          v_(max_items_) {}
+
+    circular_q(const circular_q &) = default;
+    circular_q &operator=(const circular_q &) = default;
+
+    // move cannot be default,
+    // since we need to reset head_, tail_, etc to zero in the moved object
+    circular_q(circular_q &&other) SPDLOG_NOEXCEPT { copy_moveable(std::move(other)); }
+
+    circular_q &operator=(circular_q &&other) SPDLOG_NOEXCEPT {
+        copy_moveable(std::move(other));
+        return *this;
+    }
+
+    // push back, overrun (oldest) item if no room left
+    void push_back(T &&item) {
+        if (max_items_ > 0) {
+            v_[tail_] = std::move(item);
+            tail_ = (tail_ + 1) % max_items_;
+
+            if (tail_ == head_)  // overrun last item if full
+            {
+                head_ = (head_ + 1) % max_items_;
+                ++overrun_counter_;
+            }
+        }
+    }
+
+    // Return reference to the front item.
+    // If there are no elements in the container, the behavior is undefined.
+    const T &front() const { return v_[head_]; }
+
+    T &front() { return v_[head_]; }
+
+    // Return number of elements actually stored
+    size_t size() const {
+        if (tail_ >= head_) {
+            return tail_ - head_;
+        } else {
+            return max_items_ - (head_ - tail_);
+        }
+    }
+
+    // Return const reference to item by index.
+    // If index is out of range 0…size()-1, the behavior is undefined.
+    const T &at(size_t i) const {
+        assert(i < size());
+        return v_[(head_ + i) % max_items_];
+    }
+
+    // Pop item from front.
+    // If there are no elements in the container, the behavior is undefined.
+    void pop_front() { head_ = (head_ + 1) % max_items_; }
+
+    bool empty() const { return tail_ == head_; }
+
+    bool full() const {
+        // head is ahead of the tail by 1
+        if (max_items_ > 0) {
+            return ((tail_ + 1) % max_items_) == head_;
+        }
+        return false;
+    }
+
+    size_t overrun_counter() const { return overrun_counter_; }
+
+    void reset_overrun_counter() { overrun_counter_ = 0; }
+
+private:
+    // copy from other&& and reset it to disabled state
+    void copy_moveable(circular_q &&other) SPDLOG_NOEXCEPT {
+        max_items_ = other.max_items_;
+        head_ = other.head_;
+        tail_ = other.tail_;
+        overrun_counter_ = other.overrun_counter_;
+        v_ = std::move(other.v_);
+
+        // put &&other in disabled, but valid state
+        other.max_items_ = 0;
+        other.head_ = other.tail_ = 0;
+        other.overrun_counter_ = 0;
+    }
+};
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/console_globals.h

@@ -0,0 +1,28 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <mutex>
+#include <spdlog/details/null_mutex.h>
+
+namespace spdlog {
+namespace details {
+
+struct console_mutex {
+    using mutex_t = std::mutex;
+    static mutex_t &mutex() {
+        static mutex_t s_mutex;
+        return s_mutex;
+    }
+};
+
+struct console_nullmutex {
+    using mutex_t = null_mutex;
+    static mutex_t &mutex() {
+        static mutex_t s_mutex;
+        return s_mutex;
+    }
+};
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/file_helper-inl.h

@@ -0,0 +1,152 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/file_helper.h>
+#endif
+
+#include <spdlog/common.h>
+#include <spdlog/details/os.h>
+
+#include <cerrno>
+#include <chrono>
+#include <cstdio>
+#include <string>
+#include <thread>
+#include <tuple>
+
+namespace spdlog {
+namespace details {
+
+SPDLOG_INLINE file_helper::file_helper(const file_event_handlers &event_handlers)
+    : event_handlers_(event_handlers) {}
+
+SPDLOG_INLINE file_helper::~file_helper() { close(); }
+
+SPDLOG_INLINE void file_helper::open(const filename_t &fname, bool truncate) {
+    close();
+    filename_ = fname;
+
+    auto *mode = SPDLOG_FILENAME_T("ab");
+    auto *trunc_mode = SPDLOG_FILENAME_T("wb");
+
+    if (event_handlers_.before_open) {
+        event_handlers_.before_open(filename_);
+    }
+    for (int tries = 0; tries < open_tries_; ++tries) {
+        // create containing folder if not exists already.
+        os::create_dir(os::dir_name(fname));
+        if (truncate) {
+            // Truncate by opening-and-closing a tmp file in "wb" mode, always
+            // opening the actual log-we-write-to in "ab" mode, since that
+            // interacts more politely with eternal processes that might
+            // rotate/truncate the file underneath us.
+            std::FILE *tmp;
+            if (os::fopen_s(&tmp, fname, trunc_mode)) {
+                continue;
+            }
+            std::fclose(tmp);
+        }
+        if (!os::fopen_s(&fd_, fname, mode)) {
+            if (event_handlers_.after_open) {
+                event_handlers_.after_open(filename_, fd_);
+            }
+            return;
+        }
+
+        details::os::sleep_for_millis(open_interval_);
+    }
+
+    throw_spdlog_ex("Failed opening file " + os::filename_to_str(filename_) + " for writing",
+                    errno);
+}
+
+SPDLOG_INLINE void file_helper::reopen(bool truncate) {
+    if (filename_.empty()) {
+        throw_spdlog_ex("Failed re opening file - was not opened before");
+    }
+    this->open(filename_, truncate);
+}
+
+SPDLOG_INLINE void file_helper::flush() {
+    if (std::fflush(fd_) != 0) {
+        throw_spdlog_ex("Failed flush to file " + os::filename_to_str(filename_), errno);
+    }
+}
+
+SPDLOG_INLINE void file_helper::sync() {
+    if (!os::fsync(fd_)) {
+        throw_spdlog_ex("Failed to fsync file " + os::filename_to_str(filename_), errno);
+    }
+}
+
+SPDLOG_INLINE void file_helper::close() {
+    if (fd_ != nullptr) {
+        if (event_handlers_.before_close) {
+            event_handlers_.before_close(filename_, fd_);
+        }
+
+        std::fclose(fd_);
+        fd_ = nullptr;
+
+        if (event_handlers_.after_close) {
+            event_handlers_.after_close(filename_);
+        }
+    }
+}
+
+SPDLOG_INLINE void file_helper::write(const memory_buf_t &buf) {
+    if (fd_ == nullptr) return;
+    size_t msg_size = buf.size();
+    auto data = buf.data();
+    if (std::fwrite(data, 1, msg_size, fd_) != msg_size) {
+        throw_spdlog_ex("Failed writing to file " + os::filename_to_str(filename_), errno);
+    }
+}
+
+SPDLOG_INLINE size_t file_helper::size() const {
+    if (fd_ == nullptr) {
+        throw_spdlog_ex("Cannot use size() on closed file " + os::filename_to_str(filename_));
+    }
+    return os::filesize(fd_);
+}
+
+SPDLOG_INLINE const filename_t &file_helper::filename() const { return filename_; }
+
+//
+// return file path and its extension:
+//
+// "mylog.txt" => ("mylog", ".txt")
+// "mylog" => ("mylog", "")
+// "mylog." => ("mylog.", "")
+// "/dir1/dir2/mylog.txt" => ("/dir1/dir2/mylog", ".txt")
+//
+// the starting dot in filenames is ignored (hidden files):
+//
+// ".mylog" => (".mylog". "")
+// "my_folder/.mylog" => ("my_folder/.mylog", "")
+// "my_folder/.mylog.txt" => ("my_folder/.mylog", ".txt")
+SPDLOG_INLINE std::tuple<filename_t, filename_t> file_helper::split_by_extension(
+    const filename_t &fname) {
+    auto ext_index = fname.rfind('.');
+
+    // no valid extension found - return whole path and empty string as
+    // extension
+    if (ext_index == filename_t::npos || ext_index == 0 || ext_index == fname.size() - 1) {
+        return std::make_tuple(fname, filename_t());
+    }
+
+    // treat cases like "/etc/rc.d/somelogfile or "/abc/.hiddenfile"
+    auto folder_index = fname.find_last_of(details::os::folder_seps_filename);
+    if (folder_index != filename_t::npos && folder_index >= ext_index - 1) {
+        return std::make_tuple(fname, filename_t());
+    }
+
+    // finally - return a valid base and extension tuple
+    return std::make_tuple(fname.substr(0, ext_index), fname.substr(ext_index));
+}
+
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/file_helper.h

@@ -0,0 +1,61 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/common.h>
+#include <tuple>
+
+namespace spdlog {
+namespace details {
+
+// Helper class for file sinks.
+// When failing to open a file, retry several times(5) with a delay interval(10 ms).
+// Throw spdlog_ex exception on errors.
+
+class SPDLOG_API file_helper {
+public:
+    file_helper() = default;
+    explicit file_helper(const file_event_handlers &event_handlers);
+
+    file_helper(const file_helper &) = delete;
+    file_helper &operator=(const file_helper &) = delete;
+    ~file_helper();
+
+    void open(const filename_t &fname, bool truncate = false);
+    void reopen(bool truncate);
+    void flush();
+    void sync();
+    void close();
+    void write(const memory_buf_t &buf);
+    size_t size() const;
+    const filename_t &filename() const;
+
+    //
+    // return file path and its extension:
+    //
+    // "mylog.txt" => ("mylog", ".txt")
+    // "mylog" => ("mylog", "")
+    // "mylog." => ("mylog.", "")
+    // "/dir1/dir2/mylog.txt" => ("/dir1/dir2/mylog", ".txt")
+    //
+    // the starting dot in filenames is ignored (hidden files):
+    //
+    // ".mylog" => (".mylog". "")
+    // "my_folder/.mylog" => ("my_folder/.mylog", "")
+    // "my_folder/.mylog.txt" => ("my_folder/.mylog", ".txt")
+    static std::tuple<filename_t, filename_t> split_by_extension(const filename_t &fname);
+
+private:
+    const int open_tries_ = 5;
+    const unsigned int open_interval_ = 10;
+    std::FILE *fd_{nullptr};
+    filename_t filename_;
+    file_event_handlers event_handlers_;
+};
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "file_helper-inl.h"
+#endif

3rd/spdlog/details/fmt_helper.h

@@ -0,0 +1,141 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+#pragma once
+
+#include <chrono>
+#include <iterator>
+#include <spdlog/common.h>
+#include <spdlog/fmt/fmt.h>
+#include <type_traits>
+
+#ifdef SPDLOG_USE_STD_FORMAT
+    #include <charconv>
+    #include <limits>
+#endif
+
+// Some fmt helpers to efficiently format and pad ints and strings
+namespace spdlog {
+namespace details {
+namespace fmt_helper {
+
+inline void append_string_view(spdlog::string_view_t view, memory_buf_t &dest) {
+    auto *buf_ptr = view.data();
+    dest.append(buf_ptr, buf_ptr + view.size());
+}
+
+#ifdef SPDLOG_USE_STD_FORMAT
+template <typename T>
+inline void append_int(T n, memory_buf_t &dest) {
+    // Buffer should be large enough to hold all digits (digits10 + 1) and a sign
+    SPDLOG_CONSTEXPR const auto BUF_SIZE = std::numeric_limits<T>::digits10 + 2;
+    char buf[BUF_SIZE];
+
+    auto [ptr, ec] = std::to_chars(buf, buf + BUF_SIZE, n, 10);
+    if (ec == std::errc()) {
+        dest.append(buf, ptr);
+    } else {
+        throw_spdlog_ex("Failed to format int", static_cast<int>(ec));
+    }
+}
+#else
+template <typename T>
+inline void append_int(T n, memory_buf_t &dest) {
+    fmt::format_int i(n);
+    dest.append(i.data(), i.data() + i.size());
+}
+#endif
+
+template <typename T>
+SPDLOG_CONSTEXPR_FUNC unsigned int count_digits_fallback(T n) {
+    // taken from fmt: https://github.com/fmtlib/fmt/blob/8.0.1/include/fmt/format.h#L899-L912
+    unsigned int count = 1;
+    for (;;) {
+        // Integer division is slow so do it for a group of four digits instead
+        // of for every digit. The idea comes from the talk by Alexandrescu
+        // "Three Optimization Tips for C++". See speed-test for a comparison.
+        if (n < 10) return count;
+        if (n < 100) return count + 1;
+        if (n < 1000) return count + 2;
+        if (n < 10000) return count + 3;
+        n /= 10000u;
+        count += 4;
+    }
+}
+
+template <typename T>
+inline unsigned int count_digits(T n) {
+    using count_type =
+        typename std::conditional<(sizeof(T) > sizeof(uint32_t)), uint64_t, uint32_t>::type;
+#ifdef SPDLOG_USE_STD_FORMAT
+    return count_digits_fallback(static_cast<count_type>(n));
+#else
+    return static_cast<unsigned int>(fmt::
+    // fmt 7.0.0 renamed the internal namespace to detail.
+    // See: https://github.com/fmtlib/fmt/issues/1538
+    #if FMT_VERSION < 70000
+                                         internal
+    #else
+                                         detail
+    #endif
+                                     ::count_digits(static_cast<count_type>(n)));
+#endif
+}
+
+inline void pad2(int n, memory_buf_t &dest) {
+    if (n >= 0 && n < 100)  // 0-99
+    {
+        dest.push_back(static_cast<char>('0' + n / 10));
+        dest.push_back(static_cast<char>('0' + n % 10));
+    } else  // unlikely, but just in case, let fmt deal with it
+    {
+        fmt_lib::format_to(std::back_inserter(dest), SPDLOG_FMT_STRING("{:02}"), n);
+    }
+}
+
+template <typename T>
+inline void pad_uint(T n, unsigned int width, memory_buf_t &dest) {
+    static_assert(std::is_unsigned<T>::value, "pad_uint must get unsigned T");
+    for (auto digits = count_digits(n); digits < width; digits++) {
+        dest.push_back('0');
+    }
+    append_int(n, dest);
+}
+
+template <typename T>
+inline void pad3(T n, memory_buf_t &dest) {
+    static_assert(std::is_unsigned<T>::value, "pad3 must get unsigned T");
+    if (n < 1000) {
+        dest.push_back(static_cast<char>(n / 100 + '0'));
+        n = n % 100;
+        dest.push_back(static_cast<char>((n / 10) + '0'));
+        dest.push_back(static_cast<char>((n % 10) + '0'));
+    } else {
+        append_int(n, dest);
+    }
+}
+
+template <typename T>
+inline void pad6(T n, memory_buf_t &dest) {
+    pad_uint(n, 6, dest);
+}
+
+template <typename T>
+inline void pad9(T n, memory_buf_t &dest) {
+    pad_uint(n, 9, dest);
+}
+
+// return fraction of a second of the given time_point.
+// e.g.
+// fraction<std::milliseconds>(tp) -> will return the millis part of the second
+template <typename ToDuration>
+inline ToDuration time_fraction(log_clock::time_point tp) {
+    using std::chrono::duration_cast;
+    using std::chrono::seconds;
+    auto duration = tp.time_since_epoch();
+    auto secs = duration_cast<seconds>(duration);
+    return duration_cast<ToDuration>(duration) - duration_cast<ToDuration>(secs);
+}
+
+}  // namespace fmt_helper
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/log_msg-inl.h

@@ -0,0 +1,44 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/log_msg.h>
+#endif
+
+#include <spdlog/details/os.h>
+
+namespace spdlog {
+namespace details {
+
+SPDLOG_INLINE log_msg::log_msg(spdlog::log_clock::time_point log_time,
+                               spdlog::source_loc loc,
+                               string_view_t a_logger_name,
+                               spdlog::level::level_enum lvl,
+                               spdlog::string_view_t msg)
+    : logger_name(a_logger_name),
+      level(lvl),
+      time(log_time)
+#ifndef SPDLOG_NO_THREAD_ID
+      ,
+      thread_id(os::thread_id())
+#endif
+      ,
+      source(loc),
+      payload(msg) {
+}
+
+SPDLOG_INLINE log_msg::log_msg(spdlog::source_loc loc,
+                               string_view_t a_logger_name,
+                               spdlog::level::level_enum lvl,
+                               spdlog::string_view_t msg)
+    : log_msg(os::now(), loc, a_logger_name, lvl, msg) {}
+
+SPDLOG_INLINE log_msg::log_msg(string_view_t a_logger_name,
+                               spdlog::level::level_enum lvl,
+                               spdlog::string_view_t msg)
+    : log_msg(os::now(), source_loc{}, a_logger_name, lvl, msg) {}
+
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/log_msg.h

@@ -0,0 +1,40 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/common.h>
+#include <string>
+
+namespace spdlog {
+namespace details {
+struct SPDLOG_API log_msg {
+    log_msg() = default;
+    log_msg(log_clock::time_point log_time,
+            source_loc loc,
+            string_view_t logger_name,
+            level::level_enum lvl,
+            string_view_t msg);
+    log_msg(source_loc loc, string_view_t logger_name, level::level_enum lvl, string_view_t msg);
+    log_msg(string_view_t logger_name, level::level_enum lvl, string_view_t msg);
+    log_msg(const log_msg &other) = default;
+    log_msg &operator=(const log_msg &other) = default;
+
+    string_view_t logger_name;
+    level::level_enum level{level::off};
+    log_clock::time_point time;
+    size_t thread_id{0};
+
+    // wrapping the formatted text with color (updated by pattern_formatter).
+    mutable size_t color_range_start{0};
+    mutable size_t color_range_end{0};
+
+    source_loc source;
+    string_view_t payload;
+};
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "log_msg-inl.h"
+#endif

3rd/spdlog/details/log_msg_buffer-inl.h

@@ -0,0 +1,54 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/log_msg_buffer.h>
+#endif
+
+namespace spdlog {
+namespace details {
+
+SPDLOG_INLINE log_msg_buffer::log_msg_buffer(const log_msg &orig_msg)
+    : log_msg{orig_msg} {
+    buffer.append(logger_name.begin(), logger_name.end());
+    buffer.append(payload.begin(), payload.end());
+    update_string_views();
+}
+
+SPDLOG_INLINE log_msg_buffer::log_msg_buffer(const log_msg_buffer &other)
+    : log_msg{other} {
+    buffer.append(logger_name.begin(), logger_name.end());
+    buffer.append(payload.begin(), payload.end());
+    update_string_views();
+}
+
+SPDLOG_INLINE log_msg_buffer::log_msg_buffer(log_msg_buffer &&other) SPDLOG_NOEXCEPT
+    : log_msg{other},
+      buffer{std::move(other.buffer)} {
+    update_string_views();
+}
+
+SPDLOG_INLINE log_msg_buffer &log_msg_buffer::operator=(const log_msg_buffer &other) {
+    log_msg::operator=(other);
+    buffer.clear();
+    buffer.append(other.buffer.data(), other.buffer.data() + other.buffer.size());
+    update_string_views();
+    return *this;
+}
+
+SPDLOG_INLINE log_msg_buffer &log_msg_buffer::operator=(log_msg_buffer &&other) SPDLOG_NOEXCEPT {
+    log_msg::operator=(other);
+    buffer = std::move(other.buffer);
+    update_string_views();
+    return *this;
+}
+
+SPDLOG_INLINE void log_msg_buffer::update_string_views() {
+    logger_name = string_view_t{buffer.data(), logger_name.size()};
+    payload = string_view_t{buffer.data() + logger_name.size(), payload.size()};
+}
+
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/log_msg_buffer.h

@@ -0,0 +1,32 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/log_msg.h>
+
+namespace spdlog {
+namespace details {
+
+// Extend log_msg with internal buffer to store its payload.
+// This is needed since log_msg holds string_views that points to stack data.
+
+class SPDLOG_API log_msg_buffer : public log_msg {
+    memory_buf_t buffer;
+    void update_string_views();
+
+public:
+    log_msg_buffer() = default;
+    explicit log_msg_buffer(const log_msg &orig_msg);
+    log_msg_buffer(const log_msg_buffer &other);
+    log_msg_buffer(log_msg_buffer &&other) SPDLOG_NOEXCEPT;
+    log_msg_buffer &operator=(const log_msg_buffer &other);
+    log_msg_buffer &operator=(log_msg_buffer &&other) SPDLOG_NOEXCEPT;
+};
+
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "log_msg_buffer-inl.h"
+#endif

3rd/spdlog/details/mpmc_blocking_q.h

@@ -0,0 +1,177 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+// multi producer-multi consumer blocking queue.
+// enqueue(..) - will block until room found to put the new message.
+// enqueue_nowait(..) - will return immediately with false if no room left in
+// the queue.
+// dequeue_for(..) - will block until the queue is not empty or timeout have
+// passed.
+
+#include <spdlog/details/circular_q.h>
+
+#include <atomic>
+#include <condition_variable>
+#include <mutex>
+
+namespace spdlog {
+namespace details {
+
+template <typename T>
+class mpmc_blocking_queue {
+public:
+    using item_type = T;
+    explicit mpmc_blocking_queue(size_t max_items)
+        : q_(max_items) {}
+
+#ifndef __MINGW32__
+    // try to enqueue and block if no room left
+    void enqueue(T &&item) {
+        {
+            std::unique_lock<std::mutex> lock(queue_mutex_);
+            pop_cv_.wait(lock, [this] { return !this->q_.full(); });
+            q_.push_back(std::move(item));
+        }
+        push_cv_.notify_one();
+    }
+
+    // enqueue immediately. overrun oldest message in the queue if no room left.
+    void enqueue_nowait(T &&item) {
+        {
+            std::unique_lock<std::mutex> lock(queue_mutex_);
+            q_.push_back(std::move(item));
+        }
+        push_cv_.notify_one();
+    }
+
+    void enqueue_if_have_room(T &&item) {
+        bool pushed = false;
+        {
+            std::unique_lock<std::mutex> lock(queue_mutex_);
+            if (!q_.full()) {
+                q_.push_back(std::move(item));
+                pushed = true;
+            }
+        }
+
+        if (pushed) {
+            push_cv_.notify_one();
+        } else {
+            ++discard_counter_;
+        }
+    }
+
+    // dequeue with a timeout.
+    // Return true, if succeeded dequeue item, false otherwise
+    bool dequeue_for(T &popped_item, std::chrono::milliseconds wait_duration) {
+        {
+            std::unique_lock<std::mutex> lock(queue_mutex_);
+            if (!push_cv_.wait_for(lock, wait_duration, [this] { return !this->q_.empty(); })) {
+                return false;
+            }
+            popped_item = std::move(q_.front());
+            q_.pop_front();
+        }
+        pop_cv_.notify_one();
+        return true;
+    }
+
+    // blocking dequeue without a timeout.
+    void dequeue(T &popped_item) {
+        {
+            std::unique_lock<std::mutex> lock(queue_mutex_);
+            push_cv_.wait(lock, [this] { return !this->q_.empty(); });
+            popped_item = std::move(q_.front());
+            q_.pop_front();
+        }
+        pop_cv_.notify_one();
+    }
+
+#else
+    // apparently mingw deadlocks if the mutex is released before cv.notify_one(),
+    // so release the mutex at the very end each function.
+
+    // try to enqueue and block if no room left
+    void enqueue(T &&item) {
+        std::unique_lock<std::mutex> lock(queue_mutex_);
+        pop_cv_.wait(lock, [this] { return !this->q_.full(); });
+        q_.push_back(std::move(item));
+        push_cv_.notify_one();
+    }
+
+    // enqueue immediately. overrun oldest message in the queue if no room left.
+    void enqueue_nowait(T &&item) {
+        std::unique_lock<std::mutex> lock(queue_mutex_);
+        q_.push_back(std::move(item));
+        push_cv_.notify_one();
+    }
+
+    void enqueue_if_have_room(T &&item) {
+        bool pushed = false;
+        std::unique_lock<std::mutex> lock(queue_mutex_);
+        if (!q_.full()) {
+            q_.push_back(std::move(item));
+            pushed = true;
+        }
+
+        if (pushed) {
+            push_cv_.notify_one();
+        } else {
+            ++discard_counter_;
+        }
+    }
+
+    // dequeue with a timeout.
+    // Return true, if succeeded dequeue item, false otherwise
+    bool dequeue_for(T &popped_item, std::chrono::milliseconds wait_duration) {
+        std::unique_lock<std::mutex> lock(queue_mutex_);
+        if (!push_cv_.wait_for(lock, wait_duration, [this] { return !this->q_.empty(); })) {
+            return false;
+        }
+        popped_item = std::move(q_.front());
+        q_.pop_front();
+        pop_cv_.notify_one();
+        return true;
+    }
+
+    // blocking dequeue without a timeout.
+    void dequeue(T &popped_item) {
+        std::unique_lock<std::mutex> lock(queue_mutex_);
+        push_cv_.wait(lock, [this] { return !this->q_.empty(); });
+        popped_item = std::move(q_.front());
+        q_.pop_front();
+        pop_cv_.notify_one();
+    }
+
+#endif
+
+    size_t overrun_counter() {
+        std::lock_guard<std::mutex> lock(queue_mutex_);
+        return q_.overrun_counter();
+    }
+
+    size_t discard_counter() { return discard_counter_.load(std::memory_order_relaxed); }
+
+    size_t size() {
+        std::lock_guard<std::mutex> lock(queue_mutex_);
+        return q_.size();
+    }
+
+    void reset_overrun_counter() {
+        std::lock_guard<std::mutex> lock(queue_mutex_);
+        q_.reset_overrun_counter();
+    }
+
+    void reset_discard_counter() { discard_counter_.store(0, std::memory_order_relaxed); }
+
+private:
+    std::mutex queue_mutex_;
+    std::condition_variable push_cv_;
+    std::condition_variable pop_cv_;
+    spdlog::details::circular_q<T> q_;
+    std::atomic<size_t> discard_counter_{0};
+};
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/null_mutex.h

@@ -0,0 +1,35 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <atomic>
+#include <utility>
+// null, no cost dummy "mutex" and dummy "atomic" int
+
+namespace spdlog {
+namespace details {
+struct null_mutex {
+    void lock() const {}
+    void unlock() const {}
+};
+
+struct null_atomic_int {
+    int value;
+    null_atomic_int() = default;
+
+    explicit null_atomic_int(int new_value)
+        : value(new_value) {}
+
+    int load(std::memory_order = std::memory_order_relaxed) const { return value; }
+
+    void store(int new_value, std::memory_order = std::memory_order_relaxed) { value = new_value; }
+
+    int exchange(int new_value, std::memory_order = std::memory_order_relaxed) {
+        std::swap(new_value, value);
+        return new_value;  // return value before the call
+    }
+};
+
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/os-inl.h

@@ -0,0 +1,594 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/os.h>
+#endif
+
+#include <spdlog/common.h>
+
+#include <algorithm>
+#include <array>
+#include <chrono>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <ctime>
+#include <string>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <thread>
+
+#ifdef _WIN32
+    #include <spdlog/details/windows_include.h>
+    #include <fileapi.h>  // for FlushFileBuffers
+    #include <io.h>       // for _get_osfhandle, _isatty, _fileno
+    #include <process.h>  // for _get_pid
+
+    #ifdef __MINGW32__
+        #include <share.h>
+    #endif
+
+    #if defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT) || defined(SPDLOG_WCHAR_FILENAMES)
+        #include <cassert>
+        #include <limits>
+    #endif
+
+    #include <direct.h>  // for _mkdir/_wmkdir
+
+#else  // unix
+
+    #include <fcntl.h>
+    #include <unistd.h>
+
+    #ifdef __linux__
+        #include <sys/syscall.h>  //Use gettid() syscall under linux to get thread id
+
+    #elif defined(_AIX)
+        #include <pthread.h>  // for pthread_getthrds_np
+
+    #elif defined(__DragonFly__) || defined(__FreeBSD__)
+        #include <pthread_np.h>  // for pthread_getthreadid_np
+
+    #elif defined(__NetBSD__)
+        #include <lwp.h>  // for _lwp_self
+
+    #elif defined(__sun)
+        #include <thread.h>  // for thr_self
+    #endif
+
+#endif  // unix
+
+#if defined __APPLE__
+    #include <AvailabilityMacros.h>
+#endif
+
+#ifndef __has_feature           // Clang - feature checking macros.
+    #define __has_feature(x) 0  // Compatibility with non-clang compilers.
+#endif
+
+namespace spdlog {
+namespace details {
+namespace os {
+
+SPDLOG_INLINE spdlog::log_clock::time_point now() SPDLOG_NOEXCEPT {
+#if defined __linux__ && defined SPDLOG_CLOCK_COARSE
+    timespec ts;
+    ::clock_gettime(CLOCK_REALTIME_COARSE, &ts);
+    return std::chrono::time_point<log_clock, typename log_clock::duration>(
+        std::chrono::duration_cast<typename log_clock::duration>(
+            std::chrono::seconds(ts.tv_sec) + std::chrono::nanoseconds(ts.tv_nsec)));
+
+#else
+    return log_clock::now();
+#endif
+}
+SPDLOG_INLINE std::tm localtime(const std::time_t &time_tt) SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    std::tm tm;
+    ::localtime_s(&tm, &time_tt);
+#else
+    std::tm tm;
+    ::localtime_r(&time_tt, &tm);
+#endif
+    return tm;
+}
+
+SPDLOG_INLINE std::tm localtime() SPDLOG_NOEXCEPT {
+    std::time_t now_t = ::time(nullptr);
+    return localtime(now_t);
+}
+
+SPDLOG_INLINE std::tm gmtime(const std::time_t &time_tt) SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    std::tm tm;
+    ::gmtime_s(&tm, &time_tt);
+#else
+    std::tm tm;
+    ::gmtime_r(&time_tt, &tm);
+#endif
+    return tm;
+}
+
+SPDLOG_INLINE std::tm gmtime() SPDLOG_NOEXCEPT {
+    std::time_t now_t = ::time(nullptr);
+    return gmtime(now_t);
+}
+
+// fopen_s on non windows for writing
+SPDLOG_INLINE bool fopen_s(FILE **fp, const filename_t &filename, const filename_t &mode) {
+#ifdef _WIN32
+    #ifdef SPDLOG_WCHAR_FILENAMES
+    *fp = ::_wfsopen((filename.c_str()), mode.c_str(), _SH_DENYNO);
+    #else
+    *fp = ::_fsopen((filename.c_str()), mode.c_str(), _SH_DENYNO);
+    #endif
+    #if defined(SPDLOG_PREVENT_CHILD_FD)
+    if (*fp != nullptr) {
+        auto file_handle = reinterpret_cast<HANDLE>(_get_osfhandle(::_fileno(*fp)));
+        if (!::SetHandleInformation(file_handle, HANDLE_FLAG_INHERIT, 0)) {
+            ::fclose(*fp);
+            *fp = nullptr;
+        }
+    }
+    #endif
+#else  // unix
+    #if defined(SPDLOG_PREVENT_CHILD_FD)
+    const int mode_flag = mode == SPDLOG_FILENAME_T("ab") ? O_APPEND : O_TRUNC;
+    const int fd =
+        ::open((filename.c_str()), O_CREAT | O_WRONLY | O_CLOEXEC | mode_flag, mode_t(0644));
+    if (fd == -1) {
+        return true;
+    }
+    *fp = ::fdopen(fd, mode.c_str());
+    if (*fp == nullptr) {
+        ::close(fd);
+    }
+    #else
+    *fp = ::fopen((filename.c_str()), mode.c_str());
+    #endif
+#endif
+
+    return *fp == nullptr;
+}
+
+SPDLOG_INLINE int remove(const filename_t &filename) SPDLOG_NOEXCEPT {
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+    return ::_wremove(filename.c_str());
+#else
+    return std::remove(filename.c_str());
+#endif
+}
+
+SPDLOG_INLINE int remove_if_exists(const filename_t &filename) SPDLOG_NOEXCEPT {
+    return path_exists(filename) ? remove(filename) : 0;
+}
+
+SPDLOG_INLINE int rename(const filename_t &filename1, const filename_t &filename2) SPDLOG_NOEXCEPT {
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+    return ::_wrename(filename1.c_str(), filename2.c_str());
+#else
+    return std::rename(filename1.c_str(), filename2.c_str());
+#endif
+}
+
+// Return true if path exists (file or directory)
+SPDLOG_INLINE bool path_exists(const filename_t &filename) SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    struct _stat buffer;
+    #ifdef SPDLOG_WCHAR_FILENAMES
+    return (::_wstat(filename.c_str(), &buffer) == 0);
+    #else
+    return (::_stat(filename.c_str(), &buffer) == 0);
+    #endif
+#else  // common linux/unix all have the stat system call
+    struct stat buffer;
+    return (::stat(filename.c_str(), &buffer) == 0);
+#endif
+}
+
+#ifdef _MSC_VER
+    // avoid warning about unreachable statement at the end of filesize()
+    #pragma warning(push)
+    #pragma warning(disable : 4702)
+#endif
+
+// Return file size according to open FILE* object
+SPDLOG_INLINE size_t filesize(FILE *f) {
+    if (f == nullptr) {
+        throw_spdlog_ex("Failed getting file size. fd is null");
+    }
+#if defined(_WIN32) && !defined(__CYGWIN__)
+    int fd = ::_fileno(f);
+    #if defined(_WIN64)  // 64 bits
+    __int64 ret = ::_filelengthi64(fd);
+    if (ret >= 0) {
+        return static_cast<size_t>(ret);
+    }
+
+    #else  // windows 32 bits
+    long ret = ::_filelength(fd);
+    if (ret >= 0) {
+        return static_cast<size_t>(ret);
+    }
+    #endif
+
+#else  // unix
+    // OpenBSD and AIX doesn't compile with :: before the fileno(..)
+    #if defined(__OpenBSD__) || defined(_AIX)
+    int fd = fileno(f);
+    #else
+    int fd = ::fileno(f);
+    #endif
+    // 64 bits(but not in osx, linux/musl or cygwin, where fstat64 is deprecated)
+    #if ((defined(__linux__) && defined(__GLIBC__)) || defined(__sun) || defined(_AIX)) && \
+        (defined(__LP64__) || defined(_LP64))
+    struct stat64 st;
+    if (::fstat64(fd, &st) == 0) {
+        return static_cast<size_t>(st.st_size);
+    }
+    #else  // other unix or linux 32 bits or cygwin
+    struct stat st;
+    if (::fstat(fd, &st) == 0) {
+        return static_cast<size_t>(st.st_size);
+    }
+    #endif
+#endif
+    throw_spdlog_ex("Failed getting file size from fd", errno);
+    return 0;  // will not be reached.
+}
+
+#ifdef _MSC_VER
+    #pragma warning(pop)
+#endif
+
+// Return utc offset in minutes or throw spdlog_ex on failure
+SPDLOG_INLINE int utc_minutes_offset(const std::tm &tm) {
+#ifdef _WIN32
+    #if _WIN32_WINNT < _WIN32_WINNT_WS08
+    TIME_ZONE_INFORMATION tzinfo;
+    auto rv = ::GetTimeZoneInformation(&tzinfo);
+    #else
+    DYNAMIC_TIME_ZONE_INFORMATION tzinfo;
+    auto rv = ::GetDynamicTimeZoneInformation(&tzinfo);
+    #endif
+    if (rv == TIME_ZONE_ID_INVALID) throw_spdlog_ex("Failed getting timezone info. ", errno);
+
+    int offset = -tzinfo.Bias;
+    if (tm.tm_isdst) {
+        offset -= tzinfo.DaylightBias;
+    } else {
+        offset -= tzinfo.StandardBias;
+    }
+    return offset;
+#else
+
+    #if defined(sun) || defined(__sun) || defined(_AIX) || \
+        (defined(__NEWLIB__) && !defined(__TM_GMTOFF)) ||  \
+        (!defined(_BSD_SOURCE) && !defined(_GNU_SOURCE))
+    // 'tm_gmtoff' field is BSD extension and it's missing on SunOS/Solaris
+    struct helper {
+        static long int calculate_gmt_offset(const std::tm &localtm = details::os::localtime(),
+                                             const std::tm &gmtm = details::os::gmtime()) {
+            int local_year = localtm.tm_year + (1900 - 1);
+            int gmt_year = gmtm.tm_year + (1900 - 1);
+
+            long int days = (
+                // difference in day of year
+                localtm.tm_yday -
+                gmtm.tm_yday
+
+                // + intervening leap days
+                + ((local_year >> 2) - (gmt_year >> 2)) - (local_year / 100 - gmt_year / 100) +
+                ((local_year / 100 >> 2) - (gmt_year / 100 >> 2))
+
+                // + difference in years * 365 */
+                + static_cast<long int>(local_year - gmt_year) * 365);
+
+            long int hours = (24 * days) + (localtm.tm_hour - gmtm.tm_hour);
+            long int mins = (60 * hours) + (localtm.tm_min - gmtm.tm_min);
+            long int secs = (60 * mins) + (localtm.tm_sec - gmtm.tm_sec);
+
+            return secs;
+        }
+    };
+
+    auto offset_seconds = helper::calculate_gmt_offset(tm);
+    #else
+    auto offset_seconds = tm.tm_gmtoff;
+    #endif
+
+    return static_cast<int>(offset_seconds / 60);
+#endif
+}
+
+// Return current thread id as size_t
+// It exists because the std::this_thread::get_id() is much slower(especially
+// under VS 2013)
+SPDLOG_INLINE size_t _thread_id() SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    return static_cast<size_t>(::GetCurrentThreadId());
+#elif defined(__linux__)
+    #if defined(__ANDROID__) && defined(__ANDROID_API__) && (__ANDROID_API__ < 21)
+        #define SYS_gettid __NR_gettid
+    #endif
+    return static_cast<size_t>(::syscall(SYS_gettid));
+#elif defined(_AIX)
+    struct __pthrdsinfo buf;
+    int reg_size = 0;
+    pthread_t pt = pthread_self();
+    int retval = pthread_getthrds_np(&pt, PTHRDSINFO_QUERY_TID, &buf, sizeof(buf), NULL, &reg_size);
+    int tid = (!retval) ? buf.__pi_tid : 0;
+    return static_cast<size_t>(tid);
+#elif defined(__DragonFly__) || defined(__FreeBSD__)
+    return static_cast<size_t>(::pthread_getthreadid_np());
+#elif defined(__NetBSD__)
+    return static_cast<size_t>(::_lwp_self());
+#elif defined(__OpenBSD__)
+    return static_cast<size_t>(::getthrid());
+#elif defined(__sun)
+    return static_cast<size_t>(::thr_self());
+#elif __APPLE__
+    uint64_t tid;
+    // There is no pthread_threadid_np prior to Mac OS X 10.6, and it is not supported on any PPC,
+    // including 10.6.8 Rosetta. __POWERPC__ is Apple-specific define encompassing ppc and ppc64.
+    #ifdef MAC_OS_X_VERSION_MAX_ALLOWED
+    {
+        #if (MAC_OS_X_VERSION_MAX_ALLOWED < 1060) || defined(__POWERPC__)
+        tid = pthread_mach_thread_np(pthread_self());
+        #elif MAC_OS_X_VERSION_MIN_REQUIRED < 1060
+        if (&pthread_threadid_np) {
+            pthread_threadid_np(nullptr, &tid);
+        } else {
+            tid = pthread_mach_thread_np(pthread_self());
+        }
+        #else
+        pthread_threadid_np(nullptr, &tid);
+        #endif
+    }
+    #else
+    pthread_threadid_np(nullptr, &tid);
+    #endif
+    return static_cast<size_t>(tid);
+#else  // Default to standard C++11 (other Unix)
+    return static_cast<size_t>(std::hash<std::thread::id>()(std::this_thread::get_id()));
+#endif
+}
+
+// Return current thread id as size_t (from thread local storage)
+SPDLOG_INLINE size_t thread_id() SPDLOG_NOEXCEPT {
+#if defined(SPDLOG_NO_TLS)
+    return _thread_id();
+#else  // cache thread id in tls
+    static thread_local const size_t tid = _thread_id();
+    return tid;
+#endif
+}
+
+// This is avoid msvc issue in sleep_for that happens if the clock changes.
+// See https://github.com/gabime/spdlog/issues/609
+SPDLOG_INLINE void sleep_for_millis(unsigned int milliseconds) SPDLOG_NOEXCEPT {
+#if defined(_WIN32)
+    ::Sleep(milliseconds);
+#else
+    std::this_thread::sleep_for(std::chrono::milliseconds(milliseconds));
+#endif
+}
+
+// wchar support for windows file names (SPDLOG_WCHAR_FILENAMES must be defined)
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+SPDLOG_INLINE std::string filename_to_str(const filename_t &filename) {
+    memory_buf_t buf;
+    wstr_to_utf8buf(filename, buf);
+    return SPDLOG_BUF_TO_STRING(buf);
+}
+#else
+SPDLOG_INLINE std::string filename_to_str(const filename_t &filename) { return filename; }
+#endif
+
+SPDLOG_INLINE int pid() SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    return conditional_static_cast<int>(::GetCurrentProcessId());
+#else
+    return conditional_static_cast<int>(::getpid());
+#endif
+}
+
+// Determine if the terminal supports colors
+// Based on: https://github.com/agauniyal/rang/
+SPDLOG_INLINE bool is_color_terminal() SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    return true;
+#else
+
+    static const bool result = []() {
+        const char *env_colorterm_p = std::getenv("COLORTERM");
+        if (env_colorterm_p != nullptr) {
+            return true;
+        }
+
+        static constexpr std::array<const char *, 16> terms = {
+            {"ansi", "color", "console", "cygwin", "gnome", "konsole", "kterm", "linux", "msys",
+             "putty", "rxvt", "screen", "vt100", "xterm", "alacritty", "vt102"}};
+
+        const char *env_term_p = std::getenv("TERM");
+        if (env_term_p == nullptr) {
+            return false;
+        }
+
+        return std::any_of(terms.begin(), terms.end(), [&](const char *term) {
+            return std::strstr(env_term_p, term) != nullptr;
+        });
+    }();
+
+    return result;
+#endif
+}
+
+// Determine if the terminal attached
+// Source: https://github.com/agauniyal/rang/
+SPDLOG_INLINE bool in_terminal(FILE *file) SPDLOG_NOEXCEPT {
+#ifdef _WIN32
+    return ::_isatty(_fileno(file)) != 0;
+#else
+    return ::isatty(fileno(file)) != 0;
+#endif
+}
+
+#if (defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT) || defined(SPDLOG_WCHAR_FILENAMES)) && defined(_WIN32)
+SPDLOG_INLINE void wstr_to_utf8buf(wstring_view_t wstr, memory_buf_t &target) {
+    if (wstr.size() > static_cast<size_t>((std::numeric_limits<int>::max)()) / 4 - 1) {
+        throw_spdlog_ex("UTF-16 string is too big to be converted to UTF-8");
+    }
+
+    int wstr_size = static_cast<int>(wstr.size());
+    if (wstr_size == 0) {
+        target.resize(0);
+        return;
+    }
+
+    int result_size = static_cast<int>(target.capacity());
+    if ((wstr_size + 1) * 4 > result_size) {
+        result_size =
+            ::WideCharToMultiByte(CP_UTF8, 0, wstr.data(), wstr_size, NULL, 0, NULL, NULL);
+    }
+
+    if (result_size > 0) {
+        target.resize(result_size);
+        result_size = ::WideCharToMultiByte(CP_UTF8, 0, wstr.data(), wstr_size, target.data(),
+                                            result_size, NULL, NULL);
+
+        if (result_size > 0) {
+            target.resize(result_size);
+            return;
+        }
+    }
+
+    throw_spdlog_ex(
+        fmt_lib::format("WideCharToMultiByte failed. Last error: {}", ::GetLastError()));
+}
+
+SPDLOG_INLINE void utf8_to_wstrbuf(string_view_t str, wmemory_buf_t &target) {
+    if (str.size() > static_cast<size_t>((std::numeric_limits<int>::max)()) - 1) {
+        throw_spdlog_ex("UTF-8 string is too big to be converted to UTF-16");
+    }
+
+    int str_size = static_cast<int>(str.size());
+    if (str_size == 0) {
+        target.resize(0);
+        return;
+    }
+
+    // find the size to allocate for the result buffer
+    int result_size =
+        ::MultiByteToWideChar(CP_UTF8, 0, str.data(), str_size, NULL, 0);
+
+    if (result_size > 0) {
+        target.resize(result_size);
+        result_size = ::MultiByteToWideChar(CP_UTF8, 0, str.data(), str_size, target.data(),
+                                            result_size);
+        if (result_size > 0) {
+            assert(result_size == target.size());
+            return;
+        }
+    }
+
+    throw_spdlog_ex(
+        fmt_lib::format("MultiByteToWideChar failed. Last error: {}", ::GetLastError()));
+}
+#endif  // (defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT) || defined(SPDLOG_WCHAR_FILENAMES)) &&
+        // defined(_WIN32)
+
+// return true on success
+static SPDLOG_INLINE bool mkdir_(const filename_t &path) {
+#ifdef _WIN32
+    #ifdef SPDLOG_WCHAR_FILENAMES
+    return ::_wmkdir(path.c_str()) == 0;
+    #else
+    return ::_mkdir(path.c_str()) == 0;
+    #endif
+#else
+    return ::mkdir(path.c_str(), mode_t(0755)) == 0;
+#endif
+}
+
+// create the given directory - and all directories leading to it
+// return true on success or if the directory already exists
+SPDLOG_INLINE bool create_dir(const filename_t &path) {
+    if (path_exists(path)) {
+        return true;
+    }
+
+    if (path.empty()) {
+        return false;
+    }
+
+    size_t search_offset = 0;
+    do {
+        auto token_pos = path.find_first_of(folder_seps_filename, search_offset);
+        // treat the entire path as a folder if no folder separator not found
+        if (token_pos == filename_t::npos) {
+            token_pos = path.size();
+        }
+
+        auto subdir = path.substr(0, token_pos);
+#ifdef _WIN32
+        // if subdir is just a drive letter, add a slash e.g. "c:"=>"c:\",
+        // otherwise path_exists(subdir) returns false (issue #3079)
+        const bool is_drive = subdir.length() == 2 && subdir[1] == ':';
+        if (is_drive) {
+            subdir += '\\';
+            token_pos++;
+        }
+#endif
+
+        if (!subdir.empty() && !path_exists(subdir) && !mkdir_(subdir)) {
+            return false;  // return error if failed creating dir
+        }
+        search_offset = token_pos + 1;
+    } while (search_offset < path.size());
+
+    return true;
+}
+
+// Return directory name from given path or empty string
+// "abc/file" => "abc"
+// "abc/" => "abc"
+// "abc" => ""
+// "abc///" => "abc//"
+SPDLOG_INLINE filename_t dir_name(const filename_t &path) {
+    auto pos = path.find_last_of(folder_seps_filename);
+    return pos != filename_t::npos ? path.substr(0, pos) : filename_t{};
+}
+
+std::string SPDLOG_INLINE getenv(const char *field) {
+#if defined(_MSC_VER)
+    #if defined(__cplusplus_winrt)
+    return std::string{};  // not supported under uwp
+    #else
+    size_t len = 0;
+    char buf[128];
+    bool ok = ::getenv_s(&len, buf, sizeof(buf), field) == 0;
+    return ok ? buf : std::string{};
+    #endif
+#else  // revert to getenv
+    char *buf = ::getenv(field);
+    return buf ? buf : std::string{};
+#endif
+}
+
+// Do fsync by FILE handlerpointer
+// Return true on success
+SPDLOG_INLINE bool fsync(FILE *fp) {
+#ifdef _WIN32
+    return FlushFileBuffers(reinterpret_cast<HANDLE>(_get_osfhandle(_fileno(fp)))) != 0;
+#else
+    return ::fsync(fileno(fp)) == 0;
+#endif
+}
+
+}  // namespace os
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/os.h

@@ -0,0 +1,123 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <ctime>  // std::time_t
+#include <spdlog/common.h>
+
+namespace spdlog {
+namespace details {
+namespace os {
+
+SPDLOG_API spdlog::log_clock::time_point now() SPDLOG_NOEXCEPT;
+
+SPDLOG_API std::tm localtime(const std::time_t &time_tt) SPDLOG_NOEXCEPT;
+
+SPDLOG_API std::tm localtime() SPDLOG_NOEXCEPT;
+
+SPDLOG_API std::tm gmtime(const std::time_t &time_tt) SPDLOG_NOEXCEPT;
+
+SPDLOG_API std::tm gmtime() SPDLOG_NOEXCEPT;
+
+// eol definition
+#if !defined(SPDLOG_EOL)
+    #ifdef _WIN32
+        #define SPDLOG_EOL "\r\n"
+    #else
+        #define SPDLOG_EOL "\n"
+    #endif
+#endif
+
+SPDLOG_CONSTEXPR static const char *default_eol = SPDLOG_EOL;
+
+// folder separator
+#if !defined(SPDLOG_FOLDER_SEPS)
+    #ifdef _WIN32
+        #define SPDLOG_FOLDER_SEPS "\\/"
+    #else
+        #define SPDLOG_FOLDER_SEPS "/"
+    #endif
+#endif
+
+SPDLOG_CONSTEXPR static const char folder_seps[] = SPDLOG_FOLDER_SEPS;
+SPDLOG_CONSTEXPR static const filename_t::value_type folder_seps_filename[] =
+    SPDLOG_FILENAME_T(SPDLOG_FOLDER_SEPS);
+
+// fopen_s on non windows for writing
+SPDLOG_API bool fopen_s(FILE **fp, const filename_t &filename, const filename_t &mode);
+
+// Remove filename. return 0 on success
+SPDLOG_API int remove(const filename_t &filename) SPDLOG_NOEXCEPT;
+
+// Remove file if exists. return 0 on success
+// Note: Non atomic (might return failure to delete if concurrently deleted by other process/thread)
+SPDLOG_API int remove_if_exists(const filename_t &filename) SPDLOG_NOEXCEPT;
+
+SPDLOG_API int rename(const filename_t &filename1, const filename_t &filename2) SPDLOG_NOEXCEPT;
+
+// Return if file exists.
+SPDLOG_API bool path_exists(const filename_t &filename) SPDLOG_NOEXCEPT;
+
+// Return file size according to open FILE* object
+SPDLOG_API size_t filesize(FILE *f);
+
+// Return utc offset in minutes or throw spdlog_ex on failure
+SPDLOG_API int utc_minutes_offset(const std::tm &tm = details::os::localtime());
+
+// Return current thread id as size_t
+// It exists because the std::this_thread::get_id() is much slower(especially
+// under VS 2013)
+SPDLOG_API size_t _thread_id() SPDLOG_NOEXCEPT;
+
+// Return current thread id as size_t (from thread local storage)
+SPDLOG_API size_t thread_id() SPDLOG_NOEXCEPT;
+
+// This is avoid msvc issue in sleep_for that happens if the clock changes.
+// See https://github.com/gabime/spdlog/issues/609
+SPDLOG_API void sleep_for_millis(unsigned int milliseconds) SPDLOG_NOEXCEPT;
+
+SPDLOG_API std::string filename_to_str(const filename_t &filename);
+
+SPDLOG_API int pid() SPDLOG_NOEXCEPT;
+
+// Determine if the terminal supports colors
+// Source: https://github.com/agauniyal/rang/
+SPDLOG_API bool is_color_terminal() SPDLOG_NOEXCEPT;
+
+// Determine if the terminal attached
+// Source: https://github.com/agauniyal/rang/
+SPDLOG_API bool in_terminal(FILE *file) SPDLOG_NOEXCEPT;
+
+#if (defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT) || defined(SPDLOG_WCHAR_FILENAMES)) && defined(_WIN32)
+SPDLOG_API void wstr_to_utf8buf(wstring_view_t wstr, memory_buf_t &target);
+
+SPDLOG_API void utf8_to_wstrbuf(string_view_t str, wmemory_buf_t &target);
+#endif
+
+// Return directory name from given path or empty string
+// "abc/file" => "abc"
+// "abc/" => "abc"
+// "abc" => ""
+// "abc///" => "abc//"
+SPDLOG_API filename_t dir_name(const filename_t &path);
+
+// Create a dir from the given path.
+// Return true if succeeded or if this dir already exists.
+SPDLOG_API bool create_dir(const filename_t &path);
+
+// non thread safe, cross platform getenv/getenv_s
+// return empty string if field not found
+SPDLOG_API std::string getenv(const char *field);
+
+// Do fsync by FILE objectpointer.
+// Return true on success.
+SPDLOG_API bool fsync(FILE *fp);
+
+}  // namespace os
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "os-inl.h"
+#endif

3rd/spdlog/details/periodic_worker-inl.h

@@ -0,0 +1,26 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/periodic_worker.h>
+#endif
+
+namespace spdlog {
+namespace details {
+
+// stop the worker thread and join it
+SPDLOG_INLINE periodic_worker::~periodic_worker() {
+    if (worker_thread_.joinable()) {
+        {
+            std::lock_guard<std::mutex> lock(mutex_);
+            active_ = false;
+        }
+        cv_.notify_one();
+        worker_thread_.join();
+    }
+}
+
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/periodic_worker.h

@@ -0,0 +1,58 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+// periodic worker thread - periodically executes the given callback function.
+//
+// RAII over the owned thread:
+//    creates the thread on construction.
+//    stops and joins the thread on destruction (if the thread is executing a callback, wait for it
+//    to finish first).
+
+#include <chrono>
+#include <condition_variable>
+#include <functional>
+#include <mutex>
+#include <thread>
+namespace spdlog {
+namespace details {
+
+class SPDLOG_API periodic_worker {
+public:
+    template <typename Rep, typename Period>
+    periodic_worker(const std::function<void()> &callback_fun,
+                    std::chrono::duration<Rep, Period> interval) {
+        active_ = (interval > std::chrono::duration<Rep, Period>::zero());
+        if (!active_) {
+            return;
+        }
+
+        worker_thread_ = std::thread([this, callback_fun, interval]() {
+            for (;;) {
+                std::unique_lock<std::mutex> lock(this->mutex_);
+                if (this->cv_.wait_for(lock, interval, [this] { return !this->active_; })) {
+                    return;  // active_ == false, so exit this thread
+                }
+                callback_fun();
+            }
+        });
+    }
+    std::thread &get_thread() { return worker_thread_; }
+    periodic_worker(const periodic_worker &) = delete;
+    periodic_worker &operator=(const periodic_worker &) = delete;
+    // stop the worker thread and join it
+    ~periodic_worker();
+
+private:
+    bool active_;
+    std::thread worker_thread_;
+    std::mutex mutex_;
+    std::condition_variable cv_;
+};
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "periodic_worker-inl.h"
+#endif

3rd/spdlog/details/registry-inl.h

@@ -0,0 +1,261 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/registry.h>
+#endif
+
+#include <spdlog/common.h>
+#include <spdlog/details/periodic_worker.h>
+#include <spdlog/logger.h>
+#include <spdlog/pattern_formatter.h>
+
+#ifndef SPDLOG_DISABLE_DEFAULT_LOGGER
+    // support for the default stdout color logger
+    #ifdef _WIN32
+        #include <spdlog/sinks/wincolor_sink.h>
+    #else
+        #include <spdlog/sinks/ansicolor_sink.h>
+    #endif
+#endif  // SPDLOG_DISABLE_DEFAULT_LOGGER
+
+#include <chrono>
+#include <functional>
+#include <memory>
+#include <string>
+#include <unordered_map>
+
+namespace spdlog {
+namespace details {
+
+SPDLOG_INLINE registry::registry()
+    : formatter_(new pattern_formatter()) {
+#ifndef SPDLOG_DISABLE_DEFAULT_LOGGER
+    // create default logger (ansicolor_stdout_sink_mt or wincolor_stdout_sink_mt in windows).
+    #ifdef _WIN32
+    auto color_sink = std::make_shared<sinks::wincolor_stdout_sink_mt>();
+    #else
+    auto color_sink = std::make_shared<sinks::ansicolor_stdout_sink_mt>();
+    #endif
+
+    const char *default_logger_name = "";
+    default_logger_ = std::make_shared<spdlog::logger>(default_logger_name, std::move(color_sink));
+    loggers_[default_logger_name] = default_logger_;
+
+#endif  // SPDLOG_DISABLE_DEFAULT_LOGGER
+}
+
+SPDLOG_INLINE registry::~registry() = default;
+
+SPDLOG_INLINE void registry::register_logger(std::shared_ptr<logger> new_logger) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    register_logger_(std::move(new_logger));
+}
+
+SPDLOG_INLINE void registry::initialize_logger(std::shared_ptr<logger> new_logger) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    new_logger->set_formatter(formatter_->clone());
+
+    if (err_handler_) {
+        new_logger->set_error_handler(err_handler_);
+    }
+
+    // set new level according to previously configured level or default level
+    auto it = log_levels_.find(new_logger->name());
+    auto new_level = it != log_levels_.end() ? it->second : global_log_level_;
+    new_logger->set_level(new_level);
+
+    new_logger->flush_on(flush_level_);
+
+    if (backtrace_n_messages_ > 0) {
+        new_logger->enable_backtrace(backtrace_n_messages_);
+    }
+
+    if (automatic_registration_) {
+        register_logger_(std::move(new_logger));
+    }
+}
+
+SPDLOG_INLINE std::shared_ptr<logger> registry::get(const std::string &logger_name) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    auto found = loggers_.find(logger_name);
+    return found == loggers_.end() ? nullptr : found->second;
+}
+
+SPDLOG_INLINE std::shared_ptr<logger> registry::default_logger() {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    return default_logger_;
+}
+
+// Return raw ptr to the default logger.
+// To be used directly by the spdlog default api (e.g. spdlog::info)
+// This make the default API faster, but cannot be used concurrently with set_default_logger().
+// e.g do not call set_default_logger() from one thread while calling spdlog::info() from another.
+SPDLOG_INLINE logger *registry::get_default_raw() { return default_logger_.get(); }
+
+// set default logger.
+// default logger is stored in default_logger_ (for faster retrieval) and in the loggers_ map.
+SPDLOG_INLINE void registry::set_default_logger(std::shared_ptr<logger> new_default_logger) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    if (new_default_logger != nullptr) {
+        loggers_[new_default_logger->name()] = new_default_logger;
+    }
+    default_logger_ = std::move(new_default_logger);
+}
+
+SPDLOG_INLINE void registry::set_tp(std::shared_ptr<thread_pool> tp) {
+    std::lock_guard<std::recursive_mutex> lock(tp_mutex_);
+    tp_ = std::move(tp);
+}
+
+SPDLOG_INLINE std::shared_ptr<thread_pool> registry::get_tp() {
+    std::lock_guard<std::recursive_mutex> lock(tp_mutex_);
+    return tp_;
+}
+
+// Set global formatter. Each sink in each logger will get a clone of this object
+SPDLOG_INLINE void registry::set_formatter(std::unique_ptr<formatter> formatter) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    formatter_ = std::move(formatter);
+    for (auto &l : loggers_) {
+        l.second->set_formatter(formatter_->clone());
+    }
+}
+
+SPDLOG_INLINE void registry::enable_backtrace(size_t n_messages) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    backtrace_n_messages_ = n_messages;
+
+    for (auto &l : loggers_) {
+        l.second->enable_backtrace(n_messages);
+    }
+}
+
+SPDLOG_INLINE void registry::disable_backtrace() {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    backtrace_n_messages_ = 0;
+    for (auto &l : loggers_) {
+        l.second->disable_backtrace();
+    }
+}
+
+SPDLOG_INLINE void registry::set_level(level::level_enum log_level) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    for (auto &l : loggers_) {
+        l.second->set_level(log_level);
+    }
+    global_log_level_ = log_level;
+}
+
+SPDLOG_INLINE void registry::flush_on(level::level_enum log_level) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    for (auto &l : loggers_) {
+        l.second->flush_on(log_level);
+    }
+    flush_level_ = log_level;
+}
+
+SPDLOG_INLINE void registry::set_error_handler(err_handler handler) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    for (auto &l : loggers_) {
+        l.second->set_error_handler(handler);
+    }
+    err_handler_ = std::move(handler);
+}
+
+SPDLOG_INLINE void registry::apply_all(
+    const std::function<void(const std::shared_ptr<logger>)> &fun) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    for (auto &l : loggers_) {
+        fun(l.second);
+    }
+}
+
+SPDLOG_INLINE void registry::flush_all() {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    for (auto &l : loggers_) {
+        l.second->flush();
+    }
+}
+
+SPDLOG_INLINE void registry::drop(const std::string &logger_name) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    auto is_default_logger = default_logger_ && default_logger_->name() == logger_name;
+    loggers_.erase(logger_name);
+    if (is_default_logger) {
+        default_logger_.reset();
+    }
+}
+
+SPDLOG_INLINE void registry::drop_all() {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    loggers_.clear();
+    default_logger_.reset();
+}
+
+// clean all resources and threads started by the registry
+SPDLOG_INLINE void registry::shutdown() {
+    {
+        std::lock_guard<std::mutex> lock(flusher_mutex_);
+        periodic_flusher_.reset();
+    }
+
+    drop_all();
+
+    {
+        std::lock_guard<std::recursive_mutex> lock(tp_mutex_);
+        tp_.reset();
+    }
+}
+
+SPDLOG_INLINE std::recursive_mutex &registry::tp_mutex() { return tp_mutex_; }
+
+SPDLOG_INLINE void registry::set_automatic_registration(bool automatic_registration) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    automatic_registration_ = automatic_registration;
+}
+
+SPDLOG_INLINE void registry::set_levels(log_levels levels, level::level_enum *global_level) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    log_levels_ = std::move(levels);
+    auto global_level_requested = global_level != nullptr;
+    global_log_level_ = global_level_requested ? *global_level : global_log_level_;
+
+    for (auto &logger : loggers_) {
+        auto logger_entry = log_levels_.find(logger.first);
+        if (logger_entry != log_levels_.end()) {
+            logger.second->set_level(logger_entry->second);
+        } else if (global_level_requested) {
+            logger.second->set_level(*global_level);
+        }
+    }
+}
+
+SPDLOG_INLINE registry &registry::instance() {
+    static registry s_instance;
+    return s_instance;
+}
+
+SPDLOG_INLINE void registry::apply_logger_env_levels(std::shared_ptr<logger> new_logger) {
+    std::lock_guard<std::mutex> lock(logger_map_mutex_);
+    auto it = log_levels_.find(new_logger->name());
+    auto new_level = it != log_levels_.end() ? it->second : global_log_level_;
+    new_logger->set_level(new_level);
+}
+
+SPDLOG_INLINE void registry::throw_if_exists_(const std::string &logger_name) {
+    if (loggers_.find(logger_name) != loggers_.end()) {
+        throw_spdlog_ex("logger with name '" + logger_name + "' already exists");
+    }
+}
+
+SPDLOG_INLINE void registry::register_logger_(std::shared_ptr<logger> new_logger) {
+    auto logger_name = new_logger->name();
+    throw_if_exists_(logger_name);
+    loggers_[logger_name] = std::move(new_logger);
+}
+
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/registry.h

@@ -0,0 +1,129 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+// Loggers registry of unique name->logger pointer
+// An attempt to create a logger with an already existing name will result with spdlog_ex exception.
+// If user requests a non existing logger, nullptr will be returned
+// This class is thread safe
+
+#include <spdlog/common.h>
+#include <spdlog/details/periodic_worker.h>
+
+#include <chrono>
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <unordered_map>
+
+namespace spdlog {
+class logger;
+
+namespace details {
+class thread_pool;
+
+class SPDLOG_API registry {
+public:
+    using log_levels = std::unordered_map<std::string, level::level_enum>;
+    registry(const registry &) = delete;
+    registry &operator=(const registry &) = delete;
+
+    void register_logger(std::shared_ptr<logger> new_logger);
+    void initialize_logger(std::shared_ptr<logger> new_logger);
+    std::shared_ptr<logger> get(const std::string &logger_name);
+    std::shared_ptr<logger> default_logger();
+
+    // Return raw ptr to the default logger.
+    // To be used directly by the spdlog default api (e.g. spdlog::info)
+    // This make the default API faster, but cannot be used concurrently with set_default_logger().
+    // e.g do not call set_default_logger() from one thread while calling spdlog::info() from
+    // another.
+    logger *get_default_raw();
+
+    // set default logger and add it to the registry if not registered already.
+    // default logger is stored in default_logger_ (for faster retrieval) and in the loggers_ map.
+    // Note: Make sure to unregister it when no longer needed or before calling again with a new
+    // logger.
+    void set_default_logger(std::shared_ptr<logger> new_default_logger);
+
+    void set_tp(std::shared_ptr<thread_pool> tp);
+
+    std::shared_ptr<thread_pool> get_tp();
+
+    // Set global formatter. Each sink in each logger will get a clone of this object
+    void set_formatter(std::unique_ptr<formatter> formatter);
+
+    void enable_backtrace(size_t n_messages);
+
+    void disable_backtrace();
+
+    void set_level(level::level_enum log_level);
+
+    void flush_on(level::level_enum log_level);
+
+    template <typename Rep, typename Period>
+    void flush_every(std::chrono::duration<Rep, Period> interval) {
+        std::lock_guard<std::mutex> lock(flusher_mutex_);
+        auto clbk = [this]() { this->flush_all(); };
+        periodic_flusher_ = details::make_unique<periodic_worker>(clbk, interval);
+    }
+
+    std::unique_ptr<periodic_worker> &get_flusher() {
+        std::lock_guard<std::mutex> lock(flusher_mutex_);
+        return periodic_flusher_;
+    }
+
+    void set_error_handler(err_handler handler);
+
+    void apply_all(const std::function<void(const std::shared_ptr<logger>)> &fun);
+
+    void flush_all();
+
+    void drop(const std::string &logger_name);
+
+    void drop_all();
+
+    // clean all resources and threads started by the registry
+    void shutdown();
+
+    std::recursive_mutex &tp_mutex();
+
+    void set_automatic_registration(bool automatic_registration);
+
+    // set levels for all existing/future loggers. global_level can be null if should not set.
+    void set_levels(log_levels levels, level::level_enum *global_level);
+
+    static registry &instance();
+
+    void apply_logger_env_levels(std::shared_ptr<logger> new_logger);
+
+private:
+    registry();
+    ~registry();
+
+    void throw_if_exists_(const std::string &logger_name);
+    void register_logger_(std::shared_ptr<logger> new_logger);
+    bool set_level_from_cfg_(logger *logger);
+    std::mutex logger_map_mutex_, flusher_mutex_;
+    std::recursive_mutex tp_mutex_;
+    std::unordered_map<std::string, std::shared_ptr<logger>> loggers_;
+    log_levels log_levels_;
+    std::unique_ptr<formatter> formatter_;
+    spdlog::level::level_enum global_log_level_ = level::info;
+    level::level_enum flush_level_ = level::off;
+    err_handler err_handler_;
+    std::shared_ptr<thread_pool> tp_;
+    std::unique_ptr<periodic_worker> periodic_flusher_;
+    std::shared_ptr<logger> default_logger_;
+    bool automatic_registration_ = true;
+    size_t backtrace_n_messages_ = 0;
+};
+
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "registry-inl.h"
+#endif

3rd/spdlog/details/synchronous_factory.h

@@ -0,0 +1,22 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include "registry.h"
+
+namespace spdlog {
+
+// Default logger factory-  creates synchronous loggers
+class logger;
+
+struct synchronous_factory {
+    template <typename Sink, typename... SinkArgs>
+    static std::shared_ptr<spdlog::logger> create(std::string logger_name, SinkArgs &&...args) {
+        auto sink = std::make_shared<Sink>(std::forward<SinkArgs>(args)...);
+        auto new_logger = std::make_shared<spdlog::logger>(std::move(logger_name), std::move(sink));
+        details::registry::instance().initialize_logger(new_logger);
+        return new_logger;
+    }
+};
+}  // namespace spdlog

3rd/spdlog/details/tcp_client-windows.h

@@ -0,0 +1,135 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#define WIN32_LEAN_AND_MEAN
+// tcp client helper
+#include <spdlog/common.h>
+#include <spdlog/details/os.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string>
+#include <windows.h>
+#include <winsock2.h>
+#include <ws2tcpip.h>
+
+#pragma comment(lib, "Ws2_32.lib")
+#pragma comment(lib, "Mswsock.lib")
+#pragma comment(lib, "AdvApi32.lib")
+
+namespace spdlog {
+namespace details {
+class tcp_client {
+    SOCKET socket_ = INVALID_SOCKET;
+
+    static void init_winsock_() {
+        WSADATA wsaData;
+        auto rv = WSAStartup(MAKEWORD(2, 2), &wsaData);
+        if (rv != 0) {
+            throw_winsock_error_("WSAStartup failed", ::WSAGetLastError());
+        }
+    }
+
+    static void throw_winsock_error_(const std::string &msg, int last_error) {
+        char buf[512];
+        ::FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL,
+                         last_error, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buf,
+                         (sizeof(buf) / sizeof(char)), NULL);
+
+        throw_spdlog_ex(fmt_lib::format("tcp_sink - {}: {}", msg, buf));
+    }
+
+public:
+    tcp_client() { init_winsock_(); }
+
+    ~tcp_client() {
+        close();
+        ::WSACleanup();
+    }
+
+    bool is_connected() const { return socket_ != INVALID_SOCKET; }
+
+    void close() {
+        ::closesocket(socket_);
+        socket_ = INVALID_SOCKET;
+    }
+
+    SOCKET fd() const { return socket_; }
+
+    // try to connect or throw on failure
+    void connect(const std::string &host, int port) {
+        if (is_connected()) {
+            close();
+        }
+        struct addrinfo hints {};
+        ZeroMemory(&hints, sizeof(hints));
+
+        hints.ai_family = AF_UNSPEC;      // To work with IPv4, IPv6, and so on
+        hints.ai_socktype = SOCK_STREAM;  // TCP
+        hints.ai_flags = AI_NUMERICSERV;  // port passed as as numeric value
+        hints.ai_protocol = 0;
+
+        auto port_str = std::to_string(port);
+        struct addrinfo *addrinfo_result;
+        auto rv = ::getaddrinfo(host.c_str(), port_str.c_str(), &hints, &addrinfo_result);
+        int last_error = 0;
+        if (rv != 0) {
+            last_error = ::WSAGetLastError();
+            WSACleanup();
+            throw_winsock_error_("getaddrinfo failed", last_error);
+        }
+
+        // Try each address until we successfully connect(2).
+
+        for (auto *rp = addrinfo_result; rp != nullptr; rp = rp->ai_next) {
+            socket_ = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+            if (socket_ == INVALID_SOCKET) {
+                last_error = ::WSAGetLastError();
+                WSACleanup();
+                continue;
+            }
+            if (::connect(socket_, rp->ai_addr, (int)rp->ai_addrlen) == 0) {
+                break;
+            } else {
+                last_error = ::WSAGetLastError();
+                close();
+            }
+        }
+        ::freeaddrinfo(addrinfo_result);
+        if (socket_ == INVALID_SOCKET) {
+            WSACleanup();
+            throw_winsock_error_("connect failed", last_error);
+        }
+
+        // set TCP_NODELAY
+        int enable_flag = 1;
+        ::setsockopt(socket_, IPPROTO_TCP, TCP_NODELAY, reinterpret_cast<char *>(&enable_flag),
+                     sizeof(enable_flag));
+    }
+
+    // Send exactly n_bytes of the given data.
+    // On error close the connection and throw.
+    void send(const char *data, size_t n_bytes) {
+        size_t bytes_sent = 0;
+        while (bytes_sent < n_bytes) {
+            const int send_flags = 0;
+            auto write_result =
+                ::send(socket_, data + bytes_sent, (int)(n_bytes - bytes_sent), send_flags);
+            if (write_result == SOCKET_ERROR) {
+                int last_error = ::WSAGetLastError();
+                close();
+                throw_winsock_error_("send failed", last_error);
+            }
+
+            if (write_result == 0)  // (probably should not happen but in any case..)
+            {
+                break;
+            }
+            bytes_sent += static_cast<size_t>(write_result);
+        }
+    }
+};
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/tcp_client.h

@@ -0,0 +1,127 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifdef _WIN32
+    #error include tcp_client-windows.h instead
+#endif
+
+// tcp client helper
+#include <spdlog/common.h>
+#include <spdlog/details/os.h>
+
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <string>
+
+namespace spdlog {
+namespace details {
+class tcp_client {
+    int socket_ = -1;
+
+public:
+    bool is_connected() const { return socket_ != -1; }
+
+    void close() {
+        if (is_connected()) {
+            ::close(socket_);
+            socket_ = -1;
+        }
+    }
+
+    int fd() const { return socket_; }
+
+    ~tcp_client() { close(); }
+
+    // try to connect or throw on failure
+    void connect(const std::string &host, int port) {
+        close();
+        struct addrinfo hints {};
+        memset(&hints, 0, sizeof(struct addrinfo));
+        hints.ai_family = AF_UNSPEC;      // To work with IPv4, IPv6, and so on
+        hints.ai_socktype = SOCK_STREAM;  // TCP
+        hints.ai_flags = AI_NUMERICSERV;  // port passed as as numeric value
+        hints.ai_protocol = 0;
+
+        auto port_str = std::to_string(port);
+        struct addrinfo *addrinfo_result;
+        auto rv = ::getaddrinfo(host.c_str(), port_str.c_str(), &hints, &addrinfo_result);
+        if (rv != 0) {
+            throw_spdlog_ex(fmt_lib::format("::getaddrinfo failed: {}", gai_strerror(rv)));
+        }
+
+        // Try each address until we successfully connect(2).
+        int last_errno = 0;
+        for (auto *rp = addrinfo_result; rp != nullptr; rp = rp->ai_next) {
+#if defined(SOCK_CLOEXEC)
+            const int flags = SOCK_CLOEXEC;
+#else
+            const int flags = 0;
+#endif
+            socket_ = ::socket(rp->ai_family, rp->ai_socktype | flags, rp->ai_protocol);
+            if (socket_ == -1) {
+                last_errno = errno;
+                continue;
+            }
+            rv = ::connect(socket_, rp->ai_addr, rp->ai_addrlen);
+            if (rv == 0) {
+                break;
+            }
+            last_errno = errno;
+            ::close(socket_);
+            socket_ = -1;
+        }
+        ::freeaddrinfo(addrinfo_result);
+        if (socket_ == -1) {
+            throw_spdlog_ex("::connect failed", last_errno);
+        }
+
+        // set TCP_NODELAY
+        int enable_flag = 1;
+        ::setsockopt(socket_, IPPROTO_TCP, TCP_NODELAY, reinterpret_cast<char *>(&enable_flag),
+                     sizeof(enable_flag));
+
+        // prevent sigpipe on systems where MSG_NOSIGNAL is not available
+#if defined(SO_NOSIGPIPE) && !defined(MSG_NOSIGNAL)
+        ::setsockopt(socket_, SOL_SOCKET, SO_NOSIGPIPE, reinterpret_cast<char *>(&enable_flag),
+                     sizeof(enable_flag));
+#endif
+
+#if !defined(SO_NOSIGPIPE) && !defined(MSG_NOSIGNAL)
+    #error "tcp_sink would raise SIGPIPE since neither SO_NOSIGPIPE nor MSG_NOSIGNAL are available"
+#endif
+    }
+
+    // Send exactly n_bytes of the given data.
+    // On error close the connection and throw.
+    void send(const char *data, size_t n_bytes) {
+        size_t bytes_sent = 0;
+        while (bytes_sent < n_bytes) {
+#if defined(MSG_NOSIGNAL)
+            const int send_flags = MSG_NOSIGNAL;
+#else
+            const int send_flags = 0;
+#endif
+            auto write_result =
+                ::send(socket_, data + bytes_sent, n_bytes - bytes_sent, send_flags);
+            if (write_result < 0) {
+                close();
+                throw_spdlog_ex("write(2) failed", errno);
+            }
+
+            if (write_result == 0)  // (probably should not happen but in any case..)
+            {
+                break;
+            }
+            bytes_sent += static_cast<size_t>(write_result);
+        }
+    }
+};
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/thread_pool-inl.h

@@ -0,0 +1,127 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/details/thread_pool.h>
+#endif
+
+#include <cassert>
+#include <spdlog/common.h>
+
+namespace spdlog {
+namespace details {
+
+SPDLOG_INLINE thread_pool::thread_pool(size_t q_max_items,
+                                       size_t threads_n,
+                                       std::function<void()> on_thread_start,
+                                       std::function<void()> on_thread_stop)
+    : q_(q_max_items) {
+    if (threads_n == 0 || threads_n > 1000) {
+        throw_spdlog_ex(
+            "spdlog::thread_pool(): invalid threads_n param (valid "
+            "range is 1-1000)");
+    }
+    for (size_t i = 0; i < threads_n; i++) {
+        threads_.emplace_back([this, on_thread_start, on_thread_stop] {
+            on_thread_start();
+            this->thread_pool::worker_loop_();
+            on_thread_stop();
+        });
+    }
+}
+
+SPDLOG_INLINE thread_pool::thread_pool(size_t q_max_items,
+                                       size_t threads_n,
+                                       std::function<void()> on_thread_start)
+    : thread_pool(q_max_items, threads_n, on_thread_start, [] {}) {}
+
+SPDLOG_INLINE thread_pool::thread_pool(size_t q_max_items, size_t threads_n)
+    : thread_pool(
+          q_max_items, threads_n, [] {}, [] {}) {}
+
+// message all threads to terminate gracefully join them
+SPDLOG_INLINE thread_pool::~thread_pool() {
+    SPDLOG_TRY {
+        for (size_t i = 0; i < threads_.size(); i++) {
+            post_async_msg_(async_msg(async_msg_type::terminate), async_overflow_policy::block);
+        }
+
+        for (auto &t : threads_) {
+            t.join();
+        }
+    }
+    SPDLOG_CATCH_STD
+}
+
+void SPDLOG_INLINE thread_pool::post_log(async_logger_ptr &&worker_ptr,
+                                         const details::log_msg &msg,
+                                         async_overflow_policy overflow_policy) {
+    async_msg async_m(std::move(worker_ptr), async_msg_type::log, msg);
+    post_async_msg_(std::move(async_m), overflow_policy);
+}
+
+void SPDLOG_INLINE thread_pool::post_flush(async_logger_ptr &&worker_ptr,
+                                           async_overflow_policy overflow_policy) {
+    post_async_msg_(async_msg(std::move(worker_ptr), async_msg_type::flush), overflow_policy);
+}
+
+size_t SPDLOG_INLINE thread_pool::overrun_counter() { return q_.overrun_counter(); }
+
+void SPDLOG_INLINE thread_pool::reset_overrun_counter() { q_.reset_overrun_counter(); }
+
+size_t SPDLOG_INLINE thread_pool::discard_counter() { return q_.discard_counter(); }
+
+void SPDLOG_INLINE thread_pool::reset_discard_counter() { q_.reset_discard_counter(); }
+
+size_t SPDLOG_INLINE thread_pool::queue_size() { return q_.size(); }
+
+void SPDLOG_INLINE thread_pool::post_async_msg_(async_msg &&new_msg,
+                                                async_overflow_policy overflow_policy) {
+    if (overflow_policy == async_overflow_policy::block) {
+        q_.enqueue(std::move(new_msg));
+    } else if (overflow_policy == async_overflow_policy::overrun_oldest) {
+        q_.enqueue_nowait(std::move(new_msg));
+    } else {
+        assert(overflow_policy == async_overflow_policy::discard_new);
+        q_.enqueue_if_have_room(std::move(new_msg));
+    }
+}
+
+void SPDLOG_INLINE thread_pool::worker_loop_() {
+    while (process_next_msg_()) {
+    }
+}
+
+// process next message in the queue
+// return true if this thread should still be active (while no terminate msg
+// was received)
+bool SPDLOG_INLINE thread_pool::process_next_msg_() {
+    async_msg incoming_async_msg;
+    q_.dequeue(incoming_async_msg);
+
+    switch (incoming_async_msg.msg_type) {
+        case async_msg_type::log: {
+            incoming_async_msg.worker_ptr->backend_sink_it_(incoming_async_msg);
+            return true;
+        }
+        case async_msg_type::flush: {
+            incoming_async_msg.worker_ptr->backend_flush_();
+            return true;
+        }
+
+        case async_msg_type::terminate: {
+            return false;
+        }
+
+        default: {
+            assert(false);
+        }
+    }
+
+    return true;
+}
+
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/thread_pool.h

@@ -0,0 +1,117 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/log_msg_buffer.h>
+#include <spdlog/details/mpmc_blocking_q.h>
+#include <spdlog/details/os.h>
+
+#include <chrono>
+#include <functional>
+#include <memory>
+#include <thread>
+#include <vector>
+
+namespace spdlog {
+class async_logger;
+
+namespace details {
+
+using async_logger_ptr = std::shared_ptr<spdlog::async_logger>;
+
+enum class async_msg_type { log, flush, terminate };
+
+// Async msg to move to/from the queue
+// Movable only. should never be copied
+struct async_msg : log_msg_buffer {
+    async_msg_type msg_type{async_msg_type::log};
+    async_logger_ptr worker_ptr;
+
+    async_msg() = default;
+    ~async_msg() = default;
+
+    // should only be moved in or out of the queue..
+    async_msg(const async_msg &) = delete;
+
+// support for vs2013 move
+#if defined(_MSC_VER) && _MSC_VER <= 1800
+    async_msg(async_msg &&other)
+        : log_msg_buffer(std::move(other)),
+          msg_type(other.msg_type),
+          worker_ptr(std::move(other.worker_ptr)) {}
+
+    async_msg &operator=(async_msg &&other) {
+        *static_cast<log_msg_buffer *>(this) = std::move(other);
+        msg_type = other.msg_type;
+        worker_ptr = std::move(other.worker_ptr);
+        return *this;
+    }
+#else  // (_MSC_VER) && _MSC_VER <= 1800
+    async_msg(async_msg &&) = default;
+    async_msg &operator=(async_msg &&) = default;
+#endif
+
+    // construct from log_msg with given type
+    async_msg(async_logger_ptr &&worker, async_msg_type the_type, const details::log_msg &m)
+        : log_msg_buffer{m},
+          msg_type{the_type},
+          worker_ptr{std::move(worker)} {}
+
+    async_msg(async_logger_ptr &&worker, async_msg_type the_type)
+        : log_msg_buffer{},
+          msg_type{the_type},
+          worker_ptr{std::move(worker)} {}
+
+    explicit async_msg(async_msg_type the_type)
+        : async_msg{nullptr, the_type} {}
+};
+
+class SPDLOG_API thread_pool {
+public:
+    using item_type = async_msg;
+    using q_type = details::mpmc_blocking_queue<item_type>;
+
+    thread_pool(size_t q_max_items,
+                size_t threads_n,
+                std::function<void()> on_thread_start,
+                std::function<void()> on_thread_stop);
+    thread_pool(size_t q_max_items, size_t threads_n, std::function<void()> on_thread_start);
+    thread_pool(size_t q_max_items, size_t threads_n);
+
+    // message all threads to terminate gracefully and join them
+    ~thread_pool();
+
+    thread_pool(const thread_pool &) = delete;
+    thread_pool &operator=(thread_pool &&) = delete;
+
+    void post_log(async_logger_ptr &&worker_ptr,
+                  const details::log_msg &msg,
+                  async_overflow_policy overflow_policy);
+    void post_flush(async_logger_ptr &&worker_ptr, async_overflow_policy overflow_policy);
+    size_t overrun_counter();
+    void reset_overrun_counter();
+    size_t discard_counter();
+    void reset_discard_counter();
+    size_t queue_size();
+
+private:
+    q_type q_;
+
+    std::vector<std::thread> threads_;
+
+    void post_async_msg_(async_msg &&new_msg, async_overflow_policy overflow_policy);
+    void worker_loop_();
+
+    // process next message in the queue
+    // return true if this thread should still be active (while no terminate msg
+    // was received)
+    bool process_next_msg_();
+};
+
+}  // namespace details
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "thread_pool-inl.h"
+#endif

3rd/spdlog/details/udp_client-windows.h

@@ -0,0 +1,98 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+// Helper RAII over winsock udp client socket.
+// Will throw on construction if socket creation failed.
+
+#include <spdlog/common.h>
+#include <spdlog/details/os.h>
+#include <spdlog/details/windows_include.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string>
+#include <winsock2.h>
+#include <ws2tcpip.h>
+
+#if defined(_MSC_VER)
+    #pragma comment(lib, "Ws2_32.lib")
+    #pragma comment(lib, "Mswsock.lib")
+    #pragma comment(lib, "AdvApi32.lib")
+#endif
+
+namespace spdlog {
+namespace details {
+class udp_client {
+    static constexpr int TX_BUFFER_SIZE = 1024 * 10;
+    SOCKET socket_ = INVALID_SOCKET;
+    sockaddr_in addr_ = {};
+
+    static void init_winsock_() {
+        WSADATA wsaData;
+        auto rv = ::WSAStartup(MAKEWORD(2, 2), &wsaData);
+        if (rv != 0) {
+            throw_winsock_error_("WSAStartup failed", ::WSAGetLastError());
+        }
+    }
+
+    static void throw_winsock_error_(const std::string &msg, int last_error) {
+        char buf[512];
+        ::FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL,
+                         last_error, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buf,
+                         (sizeof(buf) / sizeof(char)), NULL);
+
+        throw_spdlog_ex(fmt_lib::format("udp_sink - {}: {}", msg, buf));
+    }
+
+    void cleanup_() {
+        if (socket_ != INVALID_SOCKET) {
+            ::closesocket(socket_);
+        }
+        socket_ = INVALID_SOCKET;
+        ::WSACleanup();
+    }
+
+public:
+    udp_client(const std::string &host, uint16_t port) {
+        init_winsock_();
+
+        addr_.sin_family = PF_INET;
+        addr_.sin_port = htons(port);
+        addr_.sin_addr.s_addr = INADDR_ANY;
+        if (InetPtonA(PF_INET, host.c_str(), &addr_.sin_addr.s_addr) != 1) {
+            int last_error = ::WSAGetLastError();
+            ::WSACleanup();
+            throw_winsock_error_("error: Invalid address!", last_error);
+        }
+
+        socket_ = ::socket(PF_INET, SOCK_DGRAM, 0);
+        if (socket_ == INVALID_SOCKET) {
+            int last_error = ::WSAGetLastError();
+            ::WSACleanup();
+            throw_winsock_error_("error: Create Socket failed", last_error);
+        }
+
+        int option_value = TX_BUFFER_SIZE;
+        if (::setsockopt(socket_, SOL_SOCKET, SO_SNDBUF,
+                         reinterpret_cast<const char *>(&option_value), sizeof(option_value)) < 0) {
+            int last_error = ::WSAGetLastError();
+            cleanup_();
+            throw_winsock_error_("error: setsockopt(SO_SNDBUF) Failed!", last_error);
+        }
+    }
+
+    ~udp_client() { cleanup_(); }
+
+    SOCKET fd() const { return socket_; }
+
+    void send(const char *data, size_t n_bytes) {
+        socklen_t tolen = sizeof(struct sockaddr);
+        if (::sendto(socket_, data, static_cast<int>(n_bytes), 0, (struct sockaddr *)&addr_,
+                     tolen) == -1) {
+            throw_spdlog_ex("sendto(2) failed", errno);
+        }
+    }
+};
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/udp_client.h

@@ -0,0 +1,81 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+// Helper RAII over unix udp client socket.
+// Will throw on construction if the socket creation failed.
+
+#ifdef _WIN32
+    #error "include udp_client-windows.h instead"
+#endif
+
+#include <arpa/inet.h>
+#include <cstring>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <netinet/udp.h>
+#include <spdlog/common.h>
+#include <spdlog/details/os.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <string>
+
+namespace spdlog {
+namespace details {
+
+class udp_client {
+    static constexpr int TX_BUFFER_SIZE = 1024 * 10;
+    int socket_ = -1;
+    struct sockaddr_in sockAddr_;
+
+    void cleanup_() {
+        if (socket_ != -1) {
+            ::close(socket_);
+            socket_ = -1;
+        }
+    }
+
+public:
+    udp_client(const std::string &host, uint16_t port) {
+        socket_ = ::socket(PF_INET, SOCK_DGRAM, 0);
+        if (socket_ < 0) {
+            throw_spdlog_ex("error: Create Socket Failed!");
+        }
+
+        int option_value = TX_BUFFER_SIZE;
+        if (::setsockopt(socket_, SOL_SOCKET, SO_SNDBUF,
+                         reinterpret_cast<const char *>(&option_value), sizeof(option_value)) < 0) {
+            cleanup_();
+            throw_spdlog_ex("error: setsockopt(SO_SNDBUF) Failed!");
+        }
+
+        sockAddr_.sin_family = AF_INET;
+        sockAddr_.sin_port = htons(port);
+
+        if (::inet_aton(host.c_str(), &sockAddr_.sin_addr) == 0) {
+            cleanup_();
+            throw_spdlog_ex("error: Invalid address!");
+        }
+
+        ::memset(sockAddr_.sin_zero, 0x00, sizeof(sockAddr_.sin_zero));
+    }
+
+    ~udp_client() { cleanup_(); }
+
+    int fd() const { return socket_; }
+
+    // Send exactly n_bytes of the given data.
+    // On error close the connection and throw.
+    void send(const char *data, size_t n_bytes) {
+        ssize_t toslen = 0;
+        socklen_t tolen = sizeof(struct sockaddr);
+        if ((toslen = ::sendto(socket_, data, n_bytes, 0, (struct sockaddr *)&sockAddr_, tolen)) ==
+            -1) {
+            throw_spdlog_ex("sendto(2) failed", errno);
+        }
+    }
+};
+}  // namespace details
+}  // namespace spdlog

3rd/spdlog/details/windows_include.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#ifndef NOMINMAX
+    #define NOMINMAX  // prevent windows redefining min/max
+#endif
+
+#ifndef WIN32_LEAN_AND_MEAN
+    #define WIN32_LEAN_AND_MEAN
+#endif
+
+#include <windows.h>

3rd/spdlog/fmt/bin_to_hex.h

@@ -0,0 +1,224 @@
+//
+// Copyright(c) 2015 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+#include <cctype>
+#include <spdlog/common.h>
+
+#if defined(__has_include)
+    #if __has_include(<version>)
+        #include <version>
+    #endif
+#endif
+
+#if __cpp_lib_span >= 202002L
+    #include <span>
+#endif
+
+//
+// Support for logging binary data as hex
+// format flags, any combination of the following:
+// {:X} - print in uppercase.
+// {:s} - don't separate each byte with space.
+// {:p} - don't print the position on each line start.
+// {:n} - don't split the output to lines.
+// {:a} - show ASCII if :n is not set
+
+//
+// Examples:
+//
+// std::vector<char> v(200, 0x0b);
+// logger->info("Some buffer {}", spdlog::to_hex(v));
+// char buf[128];
+// logger->info("Some buffer {:X}", spdlog::to_hex(std::begin(buf), std::end(buf)));
+// logger->info("Some buffer {:X}", spdlog::to_hex(std::begin(buf), std::end(buf), 16));
+
+namespace spdlog {
+namespace details {
+
+template <typename It>
+class dump_info {
+public:
+    dump_info(It range_begin, It range_end, size_t size_per_line)
+        : begin_(range_begin),
+          end_(range_end),
+          size_per_line_(size_per_line) {}
+
+    // do not use begin() and end() to avoid collision with fmt/ranges
+    It get_begin() const { return begin_; }
+    It get_end() const { return end_; }
+    size_t size_per_line() const { return size_per_line_; }
+
+private:
+    It begin_, end_;
+    size_t size_per_line_;
+};
+}  // namespace details
+
+// create a dump_info that wraps the given container
+template <typename Container>
+inline details::dump_info<typename Container::const_iterator> to_hex(const Container &container,
+                                                                     size_t size_per_line = 32) {
+    static_assert(sizeof(typename Container::value_type) == 1,
+                  "sizeof(Container::value_type) != 1");
+    using Iter = typename Container::const_iterator;
+    return details::dump_info<Iter>(std::begin(container), std::end(container), size_per_line);
+}
+
+#if __cpp_lib_span >= 202002L
+
+template <typename Value, size_t Extent>
+inline details::dump_info<typename std::span<Value, Extent>::iterator> to_hex(
+    const std::span<Value, Extent> &container, size_t size_per_line = 32) {
+    using Container = std::span<Value, Extent>;
+    static_assert(sizeof(typename Container::value_type) == 1,
+                  "sizeof(Container::value_type) != 1");
+    using Iter = typename Container::iterator;
+    return details::dump_info<Iter>(std::begin(container), std::end(container), size_per_line);
+}
+
+#endif
+
+// create dump_info from ranges
+template <typename It>
+inline details::dump_info<It> to_hex(const It range_begin,
+                                     const It range_end,
+                                     size_t size_per_line = 32) {
+    return details::dump_info<It>(range_begin, range_end, size_per_line);
+}
+
+}  // namespace spdlog
+
+namespace
+#ifdef SPDLOG_USE_STD_FORMAT
+    std
+#else
+    fmt
+#endif
+{
+
+template <typename T>
+struct formatter<spdlog::details::dump_info<T>, char> {
+    const char delimiter = ' ';
+    bool put_newlines = true;
+    bool put_delimiters = true;
+    bool use_uppercase = false;
+    bool put_positions = true;  // position on start of each line
+    bool show_ascii = false;
+
+    // parse the format string flags
+    template <typename ParseContext>
+    SPDLOG_CONSTEXPR_FUNC auto parse(ParseContext &ctx) -> decltype(ctx.begin()) {
+        auto it = ctx.begin();
+        while (it != ctx.end() && *it != '}') {
+            switch (*it) {
+                case 'X':
+                    use_uppercase = true;
+                    break;
+                case 's':
+                    put_delimiters = false;
+                    break;
+                case 'p':
+                    put_positions = false;
+                    break;
+                case 'n':
+                    put_newlines = false;
+                    show_ascii = false;
+                    break;
+                case 'a':
+                    if (put_newlines) {
+                        show_ascii = true;
+                    }
+                    break;
+            }
+
+            ++it;
+        }
+        return it;
+    }
+
+    // format the given bytes range as hex
+    template <typename FormatContext, typename Container>
+    auto format(const spdlog::details::dump_info<Container> &the_range, FormatContext &ctx) const
+        -> decltype(ctx.out()) {
+        SPDLOG_CONSTEXPR const char *hex_upper = "0123456789ABCDEF";
+        SPDLOG_CONSTEXPR const char *hex_lower = "0123456789abcdef";
+        const char *hex_chars = use_uppercase ? hex_upper : hex_lower;
+
+#if !defined(SPDLOG_USE_STD_FORMAT) && FMT_VERSION < 60000
+        auto inserter = ctx.begin();
+#else
+        auto inserter = ctx.out();
+#endif
+
+        int size_per_line = static_cast<int>(the_range.size_per_line());
+        auto start_of_line = the_range.get_begin();
+        for (auto i = the_range.get_begin(); i != the_range.get_end(); i++) {
+            auto ch = static_cast<unsigned char>(*i);
+
+            if (put_newlines &&
+                (i == the_range.get_begin() || i - start_of_line >= size_per_line)) {
+                if (show_ascii && i != the_range.get_begin()) {
+                    *inserter++ = delimiter;
+                    *inserter++ = delimiter;
+                    for (auto j = start_of_line; j < i; j++) {
+                        auto pc = static_cast<unsigned char>(*j);
+                        *inserter++ = std::isprint(pc) ? static_cast<char>(*j) : '.';
+                    }
+                }
+
+                put_newline(inserter, static_cast<size_t>(i - the_range.get_begin()));
+
+                // put first byte without delimiter in front of it
+                *inserter++ = hex_chars[(ch >> 4) & 0x0f];
+                *inserter++ = hex_chars[ch & 0x0f];
+                start_of_line = i;
+                continue;
+            }
+
+            if (put_delimiters && i != the_range.get_begin()) {
+                *inserter++ = delimiter;
+            }
+
+            *inserter++ = hex_chars[(ch >> 4) & 0x0f];
+            *inserter++ = hex_chars[ch & 0x0f];
+        }
+        if (show_ascii)  // add ascii to last line
+        {
+            if (the_range.get_end() - the_range.get_begin() > size_per_line) {
+                auto blank_num = size_per_line - (the_range.get_end() - start_of_line);
+                while (blank_num-- > 0) {
+                    *inserter++ = delimiter;
+                    *inserter++ = delimiter;
+                    if (put_delimiters) {
+                        *inserter++ = delimiter;
+                    }
+                }
+            }
+            *inserter++ = delimiter;
+            *inserter++ = delimiter;
+            for (auto j = start_of_line; j != the_range.get_end(); j++) {
+                auto pc = static_cast<unsigned char>(*j);
+                *inserter++ = std::isprint(pc) ? static_cast<char>(*j) : '.';
+            }
+        }
+        return inserter;
+    }
+
+    // put newline(and position header)
+    template <typename It>
+    void put_newline(It inserter, std::size_t pos) const {
+#ifdef _WIN32
+        *inserter++ = '\r';
+#endif
+        *inserter++ = '\n';
+
+        if (put_positions) {
+            spdlog::fmt_lib::format_to(inserter, SPDLOG_FMT_STRING("{:04X}: "), pos);
+        }
+    }
+};
+}  // namespace std

3rd/spdlog/fmt/bundled/args.h

@@ -17,6 +17,7 @@
 #include "format.h"  // std_string_view
 
 FMT_BEGIN_NAMESPACE
+
 namespace detail {
 
 template <typename T> struct is_reference_wrapper : std::false_type {};
@@ -71,13 +72,19 @@ class dynamic_arg_list {
  * It can be implicitly converted into `fmt::basic_format_args` for passing
  * into type-erased formatting functions such as `fmt::vformat`.
  */
-template <typename Context> class dynamic_format_arg_store {
+template <typename Context>
+class dynamic_format_arg_store
+#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
+    // Workaround a GCC template argument substitution bug.
+    : public basic_format_args<Context>
+#endif
+{
  private:
   using char_type = typename Context::char_type;
 
   template <typename T> struct need_copy {
     static constexpr detail::type mapped_type =
-        detail::mapped_type_constant<T, char_type>::value;
+        detail::mapped_type_constant<T, Context>::value;
 
     enum {
       value = !(detail::is_reference_wrapper<T>::value ||
@@ -90,7 +97,7 @@ template <typename Context> class dynamic_format_arg_store {
   };
 
   template <typename T>
-  using stored_t = conditional_t<
+  using stored_type = conditional_t<
       std::is_convertible<T, std::basic_string<char_type>>::value &&
           !detail::is_reference_wrapper<T>::value,
       std::basic_string<char_type>, T>;
@@ -105,37 +112,41 @@ template <typename Context> class dynamic_format_arg_store {
 
   friend class basic_format_args<Context>;
 
+  auto get_types() const -> unsigned long long {
+    return detail::is_unpacked_bit | data_.size() |
+           (named_info_.empty()
+                ? 0ULL
+                : static_cast<unsigned long long>(detail::has_named_args_bit));
+  }
+
   auto data() const -> const basic_format_arg<Context>* {
     return named_info_.empty() ? data_.data() : data_.data() + 1;
   }
 
   template <typename T> void emplace_arg(const T& arg) {
-    data_.emplace_back(arg);
+    data_.emplace_back(detail::make_arg<Context>(arg));
   }
 
   template <typename T>
   void emplace_arg(const detail::named_arg<char_type, T>& arg) {
-    if (named_info_.empty())
+    if (named_info_.empty()) {
-      data_.insert(data_.begin(), basic_format_arg<Context>(nullptr, 0));
+      constexpr const detail::named_arg_info<char_type>* zero_ptr{nullptr};
-    data_.emplace_back(detail::unwrap(arg.value));
+      data_.insert(data_.begin(), {zero_ptr, 0});
+    }
+    data_.emplace_back(detail::make_arg<Context>(detail::unwrap(arg.value)));
     auto pop_one = [](std::vector<basic_format_arg<Context>>* data) {
       data->pop_back();
     };
     std::unique_ptr<std::vector<basic_format_arg<Context>>, decltype(pop_one)>
         guard{&data_, pop_one};
     named_info_.push_back({arg.name, static_cast<int>(data_.size() - 2u)});
-    data_[0] = {named_info_.data(), named_info_.size()};
+    data_[0].value_.named_args = {named_info_.data(), named_info_.size()};
     guard.release();
   }
 
  public:
   constexpr dynamic_format_arg_store() = default;
 
-  operator basic_format_args<Context>() const {
-    return basic_format_args<Context>(data(), static_cast<int>(data_.size()),
-                                      !named_info_.empty());
-  }
-
   /**
    * Adds an argument into the dynamic store for later passing to a formatting
    * function.
@@ -153,7 +164,7 @@ template <typename Context> class dynamic_format_arg_store {
    */
   template <typename T> void push_back(const T& arg) {
     if (detail::const_check(need_copy<T>::value))
-      emplace_arg(dynamic_args_.push<stored_t<T>>(arg));
+      emplace_arg(dynamic_args_.push<stored_type<T>>(arg));
     else
       emplace_arg(detail::unwrap(arg));
   }
@@ -189,7 +200,7 @@ template <typename Context> class dynamic_format_arg_store {
         dynamic_args_.push<std::basic_string<char_type>>(arg.name).c_str();
     if (detail::const_check(need_copy<T>::value)) {
       emplace_arg(
-          fmt::arg(arg_name, dynamic_args_.push<stored_t<T>>(arg.value)));
+          fmt::arg(arg_name, dynamic_args_.push<stored_type<T>>(arg.value)));
     } else {
       emplace_arg(fmt::arg(arg_name, arg.value));
     }
@@ -199,20 +210,17 @@ template <typename Context> class dynamic_format_arg_store {
   void clear() {
     data_.clear();
     named_info_.clear();
-    dynamic_args_ = {};
+    dynamic_args_ = detail::dynamic_arg_list();
   }
 
   /// Reserves space to store at least `new_cap` arguments including
   /// `new_cap_named` named arguments.
   void reserve(size_t new_cap, size_t new_cap_named) {
     FMT_ASSERT(new_cap >= new_cap_named,
-               "set of arguments includes set of named arguments");
+               "Set of arguments includes set of named arguments");
     data_.reserve(new_cap);
     named_info_.reserve(new_cap_named);
   }
-
-  /// Returns the number of elements in the store.
-  size_t size() const noexcept { return data_.size(); }
 };
 
 FMT_END_NAMESPACE

3rd/spdlog/fmt/bundled/color.h

@@ -330,7 +330,7 @@ FMT_CONSTEXPR inline auto operator|(emphasis lhs, emphasis rhs) noexcept
 namespace detail {
 
 template <typename Char> struct ansi_color_escape {
-  FMT_CONSTEXPR ansi_color_escape(color_type text_color,
+  FMT_CONSTEXPR ansi_color_escape(detail::color_type text_color,
                                   const char* esc) noexcept {
     // If we have a terminal color, we need to output another escape code
     // sequence.
@@ -412,13 +412,13 @@ template <typename Char> struct ansi_color_escape {
 };
 
 template <typename Char>
-FMT_CONSTEXPR auto make_foreground_color(color_type foreground) noexcept
+FMT_CONSTEXPR auto make_foreground_color(detail::color_type foreground) noexcept
     -> ansi_color_escape<Char> {
   return ansi_color_escape<Char>(foreground, "\x1b[38;2;");
 }
 
 template <typename Char>
-FMT_CONSTEXPR auto make_background_color(color_type background) noexcept
+FMT_CONSTEXPR auto make_background_color(detail::color_type background) noexcept
     -> ansi_color_escape<Char> {
   return ansi_color_escape<Char>(background, "\x1b[48;2;");
 }
@@ -434,35 +434,36 @@ template <typename Char> inline void reset_color(buffer<Char>& buffer) {
   buffer.append(reset_color.begin(), reset_color.end());
 }
 
-template <typename T> struct styled_arg : view {
+template <typename T> struct styled_arg : detail::view {
   const T& value;
   text_style style;
   styled_arg(const T& v, text_style s) : value(v), style(s) {}
 };
 
 template <typename Char>
-void vformat_to(buffer<Char>& buf, const text_style& ts,
+void vformat_to(
-                basic_string_view<Char> fmt,
+    buffer<Char>& buf, const text_style& ts, basic_string_view<Char> format_str,
-                basic_format_args<buffered_context<Char>> args) {
+    basic_format_args<buffered_context<type_identity_t<Char>>> args) {
   bool has_style = false;
   if (ts.has_emphasis()) {
     has_style = true;
-    auto emphasis = make_emphasis<Char>(ts.get_emphasis());
+    auto emphasis = detail::make_emphasis<Char>(ts.get_emphasis());
     buf.append(emphasis.begin(), emphasis.end());
   }
   if (ts.has_foreground()) {
     has_style = true;
-    auto foreground = make_foreground_color<Char>(ts.get_foreground());
+    auto foreground = detail::make_foreground_color<Char>(ts.get_foreground());
     buf.append(foreground.begin(), foreground.end());
   }
   if (ts.has_background()) {
     has_style = true;
-    auto background = make_background_color<Char>(ts.get_background());
+    auto background = detail::make_background_color<Char>(ts.get_background());
     buf.append(background.begin(), background.end());
   }
-  vformat_to(buf, fmt, args);
+  detail::vformat_to(buf, format_str, args, {});
-  if (has_style) reset_color<Char>(buf);
+  if (has_style) detail::reset_color<Char>(buf);
 }
+
 }  // namespace detail
 
 inline void vprint(FILE* f, const text_style& ts, string_view fmt,
@@ -484,7 +485,7 @@ inline void vprint(FILE* f, const text_style& ts, string_view fmt,
 template <typename... T>
 void print(FILE* f, const text_style& ts, format_string<T...> fmt,
            T&&... args) {
-  vprint(f, ts, fmt.str, vargs<T...>{{args...}});
+  vprint(f, ts, fmt, fmt::make_format_args(args...));
 }
 
 /**
@@ -523,7 +524,7 @@ inline auto vformat(const text_style& ts, string_view fmt, format_args args)
 template <typename... T>
 inline auto format(const text_style& ts, format_string<T...> fmt, T&&... args)
     -> std::string {
-  return fmt::vformat(ts, fmt.str, vargs<T...>{{args...}});
+  return fmt::vformat(ts, fmt, fmt::make_format_args(args...));
 }
 
 /// Formats a string with the given text_style and writes the output to `out`.
@@ -550,7 +551,7 @@ template <typename OutputIt, typename... T,
           FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
 inline auto format_to(OutputIt out, const text_style& ts,
                       format_string<T...> fmt, T&&... args) -> OutputIt {
-  return vformat_to(out, ts, fmt.str, vargs<T...>{{args...}});
+  return vformat_to(out, ts, fmt, fmt::make_format_args(args...));
 }
 
 template <typename T, typename Char>
@@ -559,30 +560,31 @@ struct formatter<detail::styled_arg<T>, Char> : formatter<T, Char> {
   auto format(const detail::styled_arg<T>& arg, FormatContext& ctx) const
       -> decltype(ctx.out()) {
     const auto& ts = arg.style;
+    const auto& value = arg.value;
     auto out = ctx.out();
 
     bool has_style = false;
     if (ts.has_emphasis()) {
       has_style = true;
       auto emphasis = detail::make_emphasis<Char>(ts.get_emphasis());
-      out = detail::copy<Char>(emphasis.begin(), emphasis.end(), out);
+      out = std::copy(emphasis.begin(), emphasis.end(), out);
     }
     if (ts.has_foreground()) {
       has_style = true;
       auto foreground =
           detail::make_foreground_color<Char>(ts.get_foreground());
-      out = detail::copy<Char>(foreground.begin(), foreground.end(), out);
+      out = std::copy(foreground.begin(), foreground.end(), out);
     }
     if (ts.has_background()) {
       has_style = true;
       auto background =
           detail::make_background_color<Char>(ts.get_background());
-      out = detail::copy<Char>(background.begin(), background.end(), out);
+      out = std::copy(background.begin(), background.end(), out);
     }
-    out = formatter<T, Char>::format(arg.value, ctx);
+    out = formatter<T, Char>::format(value, ctx);
     if (has_style) {
       auto reset_color = string_view("\x1b[0m");
-      out = detail::copy<Char>(reset_color.begin(), reset_color.end(), out);
+      out = std::copy(reset_color.begin(), reset_color.end(), out);
     }
     return out;
   }

3rd/spdlog/fmt/bundled/compile.h

@@ -21,6 +21,12 @@ FMT_EXPORT class compiled_string {};
 
 namespace detail {
 
+template <typename T, typename InputIt>
+FMT_CONSTEXPR inline auto copy(InputIt begin, InputIt end, counting_iterator it)
+    -> counting_iterator {
+  return it + (end - begin);
+}
+
 template <typename S>
 struct is_compiled_string : std::is_base_of<compiled_string, S> {};
 
@@ -36,16 +42,17 @@ struct is_compiled_string : std::is_base_of<compiled_string, S> {};
  *     std::string s = fmt::format(FMT_COMPILE("{}"), 42);
  */
 #if defined(__cpp_if_constexpr) && defined(__cpp_return_type_deduction)
-#  define FMT_COMPILE(s) FMT_STRING_IMPL(s, fmt::compiled_string)
+#  define FMT_COMPILE(s) FMT_STRING_IMPL(s, fmt::compiled_string, explicit)
 #else
 #  define FMT_COMPILE(s) FMT_STRING(s)
 #endif
 
 #if FMT_USE_NONTYPE_TEMPLATE_ARGS
-template <typename Char, size_t N, fmt::detail::fixed_string<Char, N> Str>
+template <typename Char, size_t N,
+          fmt::detail_exported::fixed_string<Char, N> Str>
 struct udl_compiled_string : compiled_string {
   using char_type = Char;
-  constexpr explicit operator basic_string_view<char_type>() const {
+  explicit constexpr operator basic_string_view<char_type>() const {
     return {Str.data, N - 1};
   }
 };
@@ -70,29 +77,6 @@ constexpr const auto& get([[maybe_unused]] const T& first,
     return detail::get<N - 1>(rest...);
 }
 
-#  if FMT_USE_NONTYPE_TEMPLATE_ARGS
-template <int N, typename T, typename... Args, typename Char>
-constexpr auto get_arg_index_by_name(basic_string_view<Char> name) -> int {
-  if constexpr (is_static_named_arg<T>()) {
-    if (name == T::name) return N;
-  }
-  if constexpr (sizeof...(Args) > 0)
-    return get_arg_index_by_name<N + 1, Args...>(name);
-  (void)name;  // Workaround an MSVC bug about "unused" parameter.
-  return -1;
-}
-#  endif
-
-template <typename... Args, typename Char>
-FMT_CONSTEXPR auto get_arg_index_by_name(basic_string_view<Char> name) -> int {
-#  if FMT_USE_NONTYPE_TEMPLATE_ARGS
-  if constexpr (sizeof...(Args) > 0)
-    return get_arg_index_by_name<0, Args...>(name);
-#  endif
-  (void)name;
-  return -1;
-}
-
 template <typename Char, typename... Args>
 constexpr int get_arg_index_by_name(basic_string_view<Char> name,
                                     type_list<Args...>) {
@@ -165,9 +149,8 @@ template <typename Char, typename T, int N> struct field {
     if constexpr (std::is_convertible<T, basic_string_view<Char>>::value) {
       auto s = basic_string_view<Char>(arg);
       return copy<Char>(s.begin(), s.end(), out);
-    } else {
-      return write<Char>(out, arg);
     }
+    return write<Char>(out, arg);
   }
 };
 
@@ -292,7 +275,6 @@ constexpr parse_specs_result<T, Char> parse_specs(basic_string_view<Char> str,
 }
 
 template <typename Char> struct arg_id_handler {
-  arg_id_kind kind;
   arg_ref<Char> arg_id;
 
   constexpr int on_auto() {
@@ -300,28 +282,25 @@ template <typename Char> struct arg_id_handler {
     return 0;
   }
   constexpr int on_index(int id) {
-    kind = arg_id_kind::index;
     arg_id = arg_ref<Char>(id);
     return 0;
   }
   constexpr int on_name(basic_string_view<Char> id) {
-    kind = arg_id_kind::name;
     arg_id = arg_ref<Char>(id);
     return 0;
   }
 };
 
 template <typename Char> struct parse_arg_id_result {
-  arg_id_kind kind;
   arg_ref<Char> arg_id;
   const Char* arg_id_end;
 };
 
 template <int ID, typename Char>
 constexpr auto parse_arg_id(const Char* begin, const Char* end) {
-  auto handler = arg_id_handler<Char>{arg_id_kind::none, arg_ref<Char>{}};
+  auto handler = arg_id_handler<Char>{arg_ref<Char>{}};
   auto arg_id_end = parse_arg_id(begin, end, handler);
-  return parse_arg_id_result<Char>{handler.kind, handler.arg_id, arg_id_end};
+  return parse_arg_id_result<Char>{handler.arg_id, arg_id_end};
 }
 
 template <typename T, typename Enable = void> struct field_type {
@@ -384,18 +363,18 @@ constexpr auto compile_format_string(S fmt) {
       constexpr char_type c =
           arg_id_end_pos != str.size() ? str[arg_id_end_pos] : char_type();
       static_assert(c == '}' || c == ':', "missing '}' in format string");
-      if constexpr (arg_id_result.kind == arg_id_kind::index) {
+      if constexpr (arg_id_result.arg_id.kind == arg_id_kind::index) {
         static_assert(
             ID == manual_indexing_id || ID == 0,
             "cannot switch from automatic to manual argument indexing");
-        constexpr auto arg_index = arg_id_result.arg_id.index;
+        constexpr auto arg_index = arg_id_result.arg_id.val.index;
         return parse_replacement_field_then_tail<get_type<arg_index, Args>,
                                                  Args, arg_id_end_pos,
                                                  arg_index, manual_indexing_id>(
             fmt);
-      } else if constexpr (arg_id_result.kind == arg_id_kind::name) {
+      } else if constexpr (arg_id_result.arg_id.kind == arg_id_kind::name) {
         constexpr auto arg_index =
-            get_arg_index_by_name(arg_id_result.arg_id.name, Args{});
+            get_arg_index_by_name(arg_id_result.arg_id.val.name, Args{});
         if constexpr (arg_index >= 0) {
           constexpr auto next_id =
               ID != manual_indexing_id ? ID + 1 : manual_indexing_id;
@@ -404,7 +383,8 @@ constexpr auto compile_format_string(S fmt) {
               arg_index, next_id>(fmt);
         } else if constexpr (c == '}') {
           return parse_tail<Args, arg_id_end_pos + 1, ID>(
-              runtime_named_field<char_type>{arg_id_result.arg_id.name}, fmt);
+              runtime_named_field<char_type>{arg_id_result.arg_id.val.name},
+              fmt);
         } else if constexpr (c == ':') {
           return unknown_format();  // no type info for specs parsing
         }
@@ -516,17 +496,15 @@ template <typename S, typename... Args,
           FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
 FMT_CONSTEXPR20 auto formatted_size(const S& fmt, const Args&... args)
     -> size_t {
-  auto buf = detail::counting_buffer<>();
+  return fmt::format_to(detail::counting_iterator(), fmt, args...).count();
-  fmt::format_to(appender(buf), fmt, args...);
-  return buf.count();
 }
 
 template <typename S, typename... Args,
           FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
 void print(std::FILE* f, const S& fmt, const Args&... args) {
-  auto buf = memory_buffer();
+  memory_buffer buffer;
-  fmt::format_to(appender(buf), fmt, args...);
+  fmt::format_to(std::back_inserter(buffer), fmt, args...);
-  detail::print(f, {buf.data(), buf.size()});
+  detail::print(f, {buffer.data(), buffer.size()});
 }
 
 template <typename S, typename... Args,
@@ -537,7 +515,7 @@ void print(const S& fmt, const Args&... args) {
 
 #if FMT_USE_NONTYPE_TEMPLATE_ARGS
 inline namespace literals {
-template <detail::fixed_string Str> constexpr auto operator""_cf() {
+template <detail_exported::fixed_string Str> constexpr auto operator""_cf() {
   using char_t = remove_cvref_t<decltype(Str.data[0])>;
   return detail::udl_compiled_string<char_t, sizeof(Str.data) / sizeof(char_t),
                                      Str>();

3rd/spdlog/fmt/bundled/fmt.license.rst

@@ -0,0 +1,27 @@
+Copyright (c) 2012 - present, Victor Zverovich
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+--- Optional exception to the license ---
+
+As an exception, if, as a result of your compiling your source code, portions
+of this Software are embedded into a machine-executable object form of such
+source code, you may redistribute such embedded portions in such object form
+without including the above copyright and permission notices.

3rd/spdlog/fmt/bundled/format-inl.h

@@ -14,6 +14,10 @@
 #  include <climits>
 #  include <cmath>
 #  include <exception>
+
+#  if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)
+#    include <locale>
+#  endif
 #endif
 
 #if defined(_WIN32) && !defined(FMT_USE_WRITE_CONSOLE)
@@ -22,22 +26,16 @@
 
 #include "format.h"
 
-#if FMT_USE_LOCALE
-#  include <locale>
-#endif
-
-#ifndef FMT_FUNC
-#  define FMT_FUNC
-#endif
-
 FMT_BEGIN_NAMESPACE
 namespace detail {
 
 FMT_FUNC void assert_fail(const char* file, int line, const char* message) {
   // Use unchecked std::fprintf to avoid triggering another assertion when
-  // writing to stderr fails.
+  // writing to stderr fails
-  fprintf(stderr, "%s:%d: assertion failed: %s", file, line, message);
+  std::fprintf(stderr, "%s:%d: assertion failed: %s", file, line, message);
-  abort();
+  // Chosen instead of std::abort to satisfy Clang in CUDA mode during device
+  // code pass.
+  std::terminate();
 }
 
 FMT_FUNC void format_error_code(detail::buffer<char>& out, int error_code,
@@ -63,95 +61,86 @@ FMT_FUNC void format_error_code(detail::buffer<char>& out, int error_code,
   FMT_ASSERT(out.size() <= inline_buffer_size, "");
 }
 
-FMT_FUNC void do_report_error(format_func func, int error_code,
+FMT_FUNC void report_error(format_func func, int error_code,
-                              const char* message) noexcept {
+                           const char* message) noexcept {
   memory_buffer full_message;
   func(full_message, error_code, message);
-  // Don't use fwrite_all because the latter may throw.
+  // Don't use fwrite_fully because the latter may throw.
   if (std::fwrite(full_message.data(), full_message.size(), 1, stderr) > 0)
     std::fputc('\n', stderr);
 }
 
 // A wrapper around fwrite that throws on error.
-inline void fwrite_all(const void* ptr, size_t count, FILE* stream) {
+inline void fwrite_fully(const void* ptr, size_t count, FILE* stream) {
   size_t written = std::fwrite(ptr, 1, count, stream);
   if (written < count)
     FMT_THROW(system_error(errno, FMT_STRING("cannot write to file")));
 }
 
-#if FMT_USE_LOCALE
+#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
-using std::locale;
-using std::numpunct;
-using std::use_facet;
-
 template <typename Locale>
 locale_ref::locale_ref(const Locale& loc) : locale_(&loc) {
-  static_assert(std::is_same<Locale, locale>::value, "");
+  static_assert(std::is_same<Locale, std::locale>::value, "");
 }
-#else
-struct locale {};
-template <typename Char> struct numpunct {
-  auto grouping() const -> std::string { return "\03"; }
-  auto thousands_sep() const -> Char { return ','; }
-  auto decimal_point() const -> Char { return '.'; }
-};
-template <typename Facet> Facet use_facet(locale) { return {}; }
-#endif  // FMT_USE_LOCALE
 
 template <typename Locale> auto locale_ref::get() const -> Locale {
-  static_assert(std::is_same<Locale, locale>::value, "");
+  static_assert(std::is_same<Locale, std::locale>::value, "");
-#if FMT_USE_LOCALE
+  return locale_ ? *static_cast<const std::locale*>(locale_) : std::locale();
-  if (locale_) return *static_cast<const locale*>(locale_);
-#endif
-  return locale();
 }
 
 template <typename Char>
 FMT_FUNC auto thousands_sep_impl(locale_ref loc) -> thousands_sep_result<Char> {
-  auto&& facet = use_facet<numpunct<Char>>(loc.get<locale>());
+  auto& facet = std::use_facet<std::numpunct<Char>>(loc.get<std::locale>());
   auto grouping = facet.grouping();
   auto thousands_sep = grouping.empty() ? Char() : facet.thousands_sep();
   return {std::move(grouping), thousands_sep};
 }
 template <typename Char>
 FMT_FUNC auto decimal_point_impl(locale_ref loc) -> Char {
-  return use_facet<numpunct<Char>>(loc.get<locale>()).decimal_point();
+  return std::use_facet<std::numpunct<Char>>(loc.get<std::locale>())
+      .decimal_point();
 }
+#else
+template <typename Char>
+FMT_FUNC auto thousands_sep_impl(locale_ref) -> thousands_sep_result<Char> {
+  return {"\03", FMT_STATIC_THOUSANDS_SEPARATOR};
+}
+template <typename Char> FMT_FUNC Char decimal_point_impl(locale_ref) {
+  return '.';
+}
+#endif
 
-#if FMT_USE_LOCALE
 FMT_FUNC auto write_loc(appender out, loc_value value,
                         const format_specs& specs, locale_ref loc) -> bool {
+#ifdef FMT_STATIC_THOUSANDS_SEPARATOR
+  value.visit(loc_writer<>{
+      out, specs, std::string(1, FMT_STATIC_THOUSANDS_SEPARATOR), "\3", "."});
+  return true;
+#else
   auto locale = loc.get<std::locale>();
   // We cannot use the num_put<char> facet because it may produce output in
   // a wrong encoding.
   using facet = format_facet<std::locale>;
   if (std::has_facet<facet>(locale))
-    return use_facet<facet>(locale).put(out, value, specs);
+    return std::use_facet<facet>(locale).put(out, value, specs);
   return facet(locale).put(out, value, specs);
-}
 #endif
+}
 }  // namespace detail
 
 FMT_FUNC void report_error(const char* message) {
-#if FMT_USE_EXCEPTIONS
-  // Use FMT_THROW instead of throw to avoid bogus unreachable code warnings
-  // from MSVC.
   FMT_THROW(format_error(message));
-#else
-  fputs(message, stderr);
-  abort();
-#endif
 }
 
 template <typename Locale> typename Locale::id format_facet<Locale>::id;
 
+#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
 template <typename Locale> format_facet<Locale>::format_facet(Locale& loc) {
-  auto& np = detail::use_facet<detail::numpunct<char>>(loc);
+  auto& numpunct = std::use_facet<std::numpunct<char>>(loc);
-  grouping_ = np.grouping();
+  grouping_ = numpunct.grouping();
-  if (!grouping_.empty()) separator_ = std::string(1, np.thousands_sep());
+  if (!grouping_.empty()) separator_ = std::string(1, numpunct.thousands_sep());
 }
 
-#if FMT_USE_LOCALE
 template <>
 FMT_API FMT_FUNC auto format_facet<std::locale>::do_put(
     appender out, loc_value val, const format_specs& specs) const -> bool {
@@ -1436,7 +1425,7 @@ FMT_FUNC void format_system_error(detail::buffer<char>& out, int error_code,
 
 FMT_FUNC void report_system_error(int error_code,
                                   const char* message) noexcept {
-  do_report_error(format_system_error, error_code, message);
+  report_error(format_system_error, error_code, message);
 }
 
 FMT_FUNC auto vformat(string_view fmt, format_args args) -> std::string {
@@ -1449,15 +1438,6 @@ FMT_FUNC auto vformat(string_view fmt, format_args args) -> std::string {
 
 namespace detail {
 
-FMT_FUNC void vformat_to(buffer<char>& buf, string_view fmt, format_args args,
-                         locale_ref loc) {
-  auto out = appender(buf);
-  if (fmt.size() == 2 && equal2(fmt.data(), "{}"))
-    return args.get(0).visit(default_arg_formatter<char>{out});
-  parse_format_string(
-      fmt, format_handler<char>{parse_context<char>(fmt), {out, args, loc}});
-}
-
 template <typename T> struct span {
   T* data;
   size_t size;
@@ -1528,7 +1508,6 @@ template <typename F> class glibc_file : public file_base<F> {
   void init_buffer() {
     if (this->file_->_IO_write_ptr) return;
     // Force buffer initialization by placing and removing a char in a buffer.
-    assume(this->file_->_IO_write_ptr >= this->file_->_IO_write_end);
     putc_unlocked(0, this->file_);
     --this->file_->_IO_write_ptr;
   }
@@ -1636,7 +1615,7 @@ template <typename F> class fallback_file : public file_base<F> {
 };
 
 #ifndef FMT_USE_FALLBACK_FILE
-#  define FMT_USE_FALLBACK_FILE 0
+#  define FMT_USE_FALLBACK_FILE 1
 #endif
 
 template <typename F,
@@ -1713,7 +1692,7 @@ FMT_FUNC void vprint_mojibake(std::FILE* f, string_view fmt, format_args args,
   auto buffer = memory_buffer();
   detail::vformat_to(buffer, fmt, args);
   if (newline) buffer.push_back('\n');
-  fwrite_all(buffer.data(), buffer.size(), f);
+  fwrite_fully(buffer.data(), buffer.size(), f);
 }
 #endif
 
@@ -1725,7 +1704,7 @@ FMT_FUNC void print(std::FILE* f, string_view text) {
     if (write_console(fd, text)) return;
   }
 #endif
-  fwrite_all(text.data(), text.size(), f);
+  fwrite_fully(text.data(), text.size(), f);
 }
 }  // namespace detail
 

3rd/spdlog/fmt/bundled/locale.h

@@ -0,0 +1,2 @@
+#include "xchar.h"
+#warning fmt/locale.h is deprecated, include fmt/format.h or fmt/xchar.h instead

3rd/spdlog/fmt/bundled/os.h

@@ -118,7 +118,7 @@ FMT_API void format_windows_error(buffer<char>& out, int error_code,
                                   const char* message) noexcept;
 }
 
-FMT_API std::system_error vwindows_error(int error_code, string_view fmt,
+FMT_API std::system_error vwindows_error(int error_code, string_view format_str,
                                          format_args args);
 
 /**
@@ -146,10 +146,10 @@ FMT_API std::system_error vwindows_error(int error_code, string_view fmt,
  *                                "cannot open file '{}'", filename);
  *     }
  */
-template <typename... T>
+template <typename... Args>
-auto windows_error(int error_code, string_view message, const T&... args)
+std::system_error windows_error(int error_code, string_view message,
-    -> std::system_error {
+                                const Args&... args) {
-  return vwindows_error(error_code, message, vargs<T...>{{args...}});
+  return vwindows_error(error_code, message, fmt::make_format_args(args...));
 }
 
 // Reports a Windows error without throwing an exception.
@@ -164,8 +164,8 @@ inline auto system_category() noexcept -> const std::error_category& {
 // std::system is not available on some platforms such as iOS (#2248).
 #ifdef __OSX__
 template <typename S, typename... Args, typename Char = char_t<S>>
-void say(const S& fmt, Args&&... args) {
+void say(const S& format_str, Args&&... args) {
-  std::system(format("say \"{}\"", format(fmt, args...)).c_str());
+  std::system(format("say \"{}\"", format(format_str, args...)).c_str());
 }
 #endif
 
@@ -176,24 +176,24 @@ class buffered_file {
 
   friend class file;
 
-  inline explicit buffered_file(FILE* f) : file_(f) {}
+  explicit buffered_file(FILE* f) : file_(f) {}
 
  public:
   buffered_file(const buffered_file&) = delete;
   void operator=(const buffered_file&) = delete;
 
   // Constructs a buffered_file object which doesn't represent any file.
-  inline buffered_file() noexcept : file_(nullptr) {}
+  buffered_file() noexcept : file_(nullptr) {}
 
   // Destroys the object closing the file it represents if any.
   FMT_API ~buffered_file() noexcept;
 
  public:
-  inline buffered_file(buffered_file&& other) noexcept : file_(other.file_) {
+  buffered_file(buffered_file&& other) noexcept : file_(other.file_) {
     other.file_ = nullptr;
   }
 
-  inline auto operator=(buffered_file&& other) -> buffered_file& {
+  auto operator=(buffered_file&& other) -> buffered_file& {
     close();
     file_ = other.file_;
     other.file_ = nullptr;
@@ -207,13 +207,13 @@ class buffered_file {
   FMT_API void close();
 
   // Returns the pointer to a FILE object representing this file.
-  inline auto get() const noexcept -> FILE* { return file_; }
+  auto get() const noexcept -> FILE* { return file_; }
 
   FMT_API auto descriptor() const -> int;
 
   template <typename... T>
   inline void print(string_view fmt, const T&... args) {
-    fmt::vargs<T...> vargs = {{args...}};
+    const auto& vargs = fmt::make_format_args(args...);
     detail::is_locking<T...>() ? fmt::vprint_buffered(file_, fmt, vargs)
                                : fmt::vprint(file_, fmt, vargs);
   }
@@ -248,7 +248,7 @@ class FMT_API file {
   };
 
   // Constructs a file object which doesn't represent any file.
-  inline file() noexcept : fd_(-1) {}
+  file() noexcept : fd_(-1) {}
 
   // Opens a file and constructs a file object representing this file.
   file(cstring_view path, int oflag);
@@ -257,10 +257,10 @@ class FMT_API file {
   file(const file&) = delete;
   void operator=(const file&) = delete;
 
-  inline file(file&& other) noexcept : fd_(other.fd_) { other.fd_ = -1; }
+  file(file&& other) noexcept : fd_(other.fd_) { other.fd_ = -1; }
 
   // Move assignment is not noexcept because close may throw.
-  inline auto operator=(file&& other) -> file& {
+  auto operator=(file&& other) -> file& {
     close();
     fd_ = other.fd_;
     other.fd_ = -1;
@@ -271,7 +271,7 @@ class FMT_API file {
   ~file() noexcept;
 
   // Returns the file descriptor.
-  inline auto descriptor() const noexcept -> int { return fd_; }
+  auto descriptor() const noexcept -> int { return fd_; }
 
   // Closes the file.
   void close();
@@ -324,9 +324,9 @@ auto getpagesize() -> long;
 namespace detail {
 
 struct buffer_size {
-  constexpr buffer_size() = default;
+  buffer_size() = default;
   size_t value = 0;
-  FMT_CONSTEXPR auto operator=(size_t val) const -> buffer_size {
+  auto operator=(size_t val) const -> buffer_size {
     auto bs = buffer_size();
     bs.value = val;
     return bs;
@@ -337,7 +337,7 @@ struct ostream_params {
   int oflag = file::WRONLY | file::CREATE | file::TRUNC;
   size_t buffer_size = BUFSIZ > 32768 ? BUFSIZ : 32768;
 
-  constexpr ostream_params() {}
+  ostream_params() {}
 
   template <typename... T>
   ostream_params(T... params, int new_oflag) : ostream_params(params...) {
@@ -358,47 +358,59 @@ struct ostream_params {
 #  endif
 };
 
-}  // namespace detail
+class file_buffer final : public buffer<char> {
-
-FMT_INLINE_VARIABLE constexpr auto buffer_size = detail::buffer_size();
-
-/// A fast buffered output stream for writing from a single thread. Writing from
-/// multiple threads without external synchronization may result in a data race.
-class FMT_API ostream : private detail::buffer<char> {
  private:
   file file_;
 
-  ostream(cstring_view path, const detail::ostream_params& params);
+  FMT_API static void grow(buffer<char>& buf, size_t);
-
-  static void grow(buffer<char>& buf, size_t);
 
  public:
-  ostream(ostream&& other) noexcept;
+  FMT_API file_buffer(cstring_view path, const ostream_params& params);
-  ~ostream();
+  FMT_API file_buffer(file_buffer&& other) noexcept;
+  FMT_API ~file_buffer();
 
-  operator writer() {
+  void flush() {
-    detail::buffer<char>& buf = *this;
-    return buf;
-  }
-
-  inline void flush() {
     if (size() == 0) return;
     file_.write(data(), size() * sizeof(data()[0]));
     clear();
   }
 
-  template <typename... T>
+  void close() {
-  friend auto output_file(cstring_view path, T... params) -> ostream;
-
-  inline void close() {
     flush();
     file_.close();
   }
+};
+
+}  // namespace detail
+
+constexpr auto buffer_size = detail::buffer_size();
+
+/// A fast output stream for writing from a single thread. Writing from
+/// multiple threads without external synchronization may result in a data race.
+class FMT_API ostream {
+ private:
+  FMT_MSC_WARNING(suppress : 4251)
+  detail::file_buffer buffer_;
+
+  ostream(cstring_view path, const detail::ostream_params& params)
+      : buffer_(path, params) {}
+
+ public:
+  ostream(ostream&& other) : buffer_(std::move(other.buffer_)) {}
+
+  ~ostream();
+
+  void flush() { buffer_.flush(); }
+
+  template <typename... T>
+  friend auto output_file(cstring_view path, T... params) -> ostream;
+
+  void close() { buffer_.close(); }
 
   /// Formats `args` according to specifications in `fmt` and writes the
   /// output to the file.
   template <typename... T> void print(format_string<T...> fmt, T&&... args) {
-    vformat_to(appender(*this), fmt.str, vargs<T...>{{args...}});
+    vformat_to(appender(buffer_), fmt, fmt::make_format_args(args...));
   }
 };
 

3rd/spdlog/fmt/bundled/ostream.h

@@ -22,14 +22,6 @@
 
 #include "chrono.h"  // formatbuf
 
-#ifdef _MSVC_STL_UPDATE
-#  define FMT_MSVC_STL_UPDATE _MSVC_STL_UPDATE
-#elif defined(_MSC_VER) && _MSC_VER < 1912  // VS 15.5
-#  define FMT_MSVC_STL_UPDATE _MSVC_LANG
-#else
-#  define FMT_MSVC_STL_UPDATE 0
-#endif
-
 FMT_BEGIN_NAMESPACE
 namespace detail {
 
@@ -43,18 +35,53 @@ class file_access {
   friend auto get_file(BufType& obj) -> FILE* { return obj.*FileMemberPtr; }
 };
 
-#if FMT_MSVC_STL_UPDATE
+#if FMT_MSC_VERSION
 template class file_access<file_access_tag, std::filebuf,
                            &std::filebuf::_Myfile>;
 auto get_file(std::filebuf&) -> FILE*;
 #endif
 
+inline auto write_ostream_unicode(std::ostream& os, fmt::string_view data)
+    -> bool {
+  FILE* f = nullptr;
+#if FMT_MSC_VERSION && FMT_USE_RTTI
+  if (auto* buf = dynamic_cast<std::filebuf*>(os.rdbuf()))
+    f = get_file(*buf);
+  else
+    return false;
+#elif defined(_WIN32) && defined(__GLIBCXX__) && FMT_USE_RTTI
+  auto* rdbuf = os.rdbuf();
+  if (auto* sfbuf = dynamic_cast<__gnu_cxx::stdio_sync_filebuf<char>*>(rdbuf))
+    f = sfbuf->file();
+  else if (auto* fbuf = dynamic_cast<__gnu_cxx::stdio_filebuf<char>*>(rdbuf))
+    f = fbuf->file();
+  else
+    return false;
+#else
+  ignore_unused(os, data, f);
+#endif
+#ifdef _WIN32
+  if (f) {
+    int fd = _fileno(f);
+    if (_isatty(fd)) {
+      os.flush();
+      return write_console(fd, data);
+    }
+  }
+#endif
+  return false;
+}
+inline auto write_ostream_unicode(std::wostream&,
+                                  fmt::basic_string_view<wchar_t>) -> bool {
+  return false;
+}
+
 // Write the content of buf to os.
 // It is a separate function rather than a part of vprint to simplify testing.
 template <typename Char>
 void write_buffer(std::basic_ostream<Char>& os, buffer<Char>& buf) {
   const Char* buf_data = buf.data();
-  using unsigned_streamsize = make_unsigned_t<std::streamsize>;
+  using unsigned_streamsize = std::make_unsigned<std::streamsize>::type;
   unsigned_streamsize size = buf.size();
   unsigned_streamsize max_size = to_unsigned(max_value<std::streamsize>());
   do {
@@ -65,9 +92,21 @@ void write_buffer(std::basic_ostream<Char>& os, buffer<Char>& buf) {
   } while (size != 0);
 }
 
+template <typename Char, typename T>
+void format_value(buffer<Char>& buf, const T& value) {
+  auto&& format_buf = formatbuf<std::basic_streambuf<Char>>(buf);
+  auto&& output = std::basic_ostream<Char>(&format_buf);
+#if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)
+  output.imbue(std::locale::classic());  // The default is always unlocalized.
+#endif
+  output << value;
+  output.exceptions(std::ios_base::failbit | std::ios_base::badbit);
+}
+
 template <typename T> struct streamed_view {
   const T& value;
 };
+
 }  // namespace detail
 
 // Formats an object of type T that has an overloaded ostream operator<<.
@@ -78,11 +117,7 @@ struct basic_ostream_formatter : formatter<basic_string_view<Char>, Char> {
   template <typename T, typename Context>
   auto format(const T& value, Context& ctx) const -> decltype(ctx.out()) {
     auto buffer = basic_memory_buffer<Char>();
-    auto&& formatbuf = detail::formatbuf<std::basic_streambuf<Char>>(buffer);
+    detail::format_value(buffer, value);
-    auto&& output = std::basic_ostream<Char>(&formatbuf);
-    output.imbue(std::locale::classic());  // The default is always unlocalized.
-    output << value;
-    output.exceptions(std::ios_base::failbit | std::ios_base::badbit);
     return formatter<basic_string_view<Char>, Char>::format(
         {buffer.data(), buffer.size()}, ctx);
   }
@@ -113,30 +148,24 @@ constexpr auto streamed(const T& value) -> detail::streamed_view<T> {
   return {value};
 }
 
-inline void vprint(std::ostream& os, string_view fmt, format_args args) {
+namespace detail {
+
+inline void vprint_directly(std::ostream& os, string_view format_str,
+                            format_args args) {
   auto buffer = memory_buffer();
-  detail::vformat_to(buffer, fmt, args);
+  detail::vformat_to(buffer, format_str, args);
-  FILE* f = nullptr;
+  detail::write_buffer(os, buffer);
-#if FMT_MSVC_STL_UPDATE && FMT_USE_RTTI
+}
-  if (auto* buf = dynamic_cast<std::filebuf*>(os.rdbuf()))
+
-    f = detail::get_file(*buf);
+}  // namespace detail
-#elif defined(_WIN32) && defined(__GLIBCXX__) && FMT_USE_RTTI
+
-  auto* rdbuf = os.rdbuf();
+FMT_EXPORT template <typename Char>
-  if (auto* sfbuf = dynamic_cast<__gnu_cxx::stdio_sync_filebuf<char>*>(rdbuf))
+void vprint(std::basic_ostream<Char>& os,
-    f = sfbuf->file();
+            basic_string_view<type_identity_t<Char>> format_str,
-  else if (auto* fbuf = dynamic_cast<__gnu_cxx::stdio_filebuf<char>*>(rdbuf))
+            typename detail::vformat_args<Char>::type args) {
-    f = fbuf->file();
+  auto buffer = basic_memory_buffer<Char>();
-#endif
+  detail::vformat_to(buffer, format_str, args);
-#ifdef _WIN32
+  if (detail::write_ostream_unicode(os, {buffer.data(), buffer.size()})) return;
-  if (f) {
-    int fd = _fileno(f);
-    if (_isatty(fd)) {
-      os.flush();
-      if (detail::write_console(fd, {buffer.data(), buffer.size()})) return;
-    }
-  }
-#endif
-  detail::ignore_unused(f);
   detail::write_buffer(os, buffer);
 }
 
@@ -149,11 +178,19 @@ inline void vprint(std::ostream& os, string_view fmt, format_args args) {
  */
 FMT_EXPORT template <typename... T>
 void print(std::ostream& os, format_string<T...> fmt, T&&... args) {
-  fmt::vargs<T...> vargs = {{args...}};
+  const auto& vargs = fmt::make_format_args(args...);
-  if (detail::use_utf8) return vprint(os, fmt.str, vargs);
+  if (detail::use_utf8())
-  auto buffer = memory_buffer();
+    vprint(os, fmt, vargs);
-  detail::vformat_to(buffer, fmt.str, vargs);
+  else
-  detail::write_buffer(os, buffer);
+    detail::vprint_directly(os, fmt, vargs);
+}
+
+FMT_EXPORT
+template <typename... Args>
+void print(std::wostream& os,
+           basic_format_string<wchar_t, type_identity_t<Args>...> fmt,
+           Args&&... args) {
+  vprint(os, fmt, fmt::make_format_args<buffered_context<wchar_t>>(args...));
 }
 
 FMT_EXPORT template <typename... T>
@@ -161,6 +198,14 @@ void println(std::ostream& os, format_string<T...> fmt, T&&... args) {
   fmt::print(os, "{}\n", fmt::format(fmt, std::forward<T>(args)...));
 }
 
+FMT_EXPORT
+template <typename... Args>
+void println(std::wostream& os,
+             basic_format_string<wchar_t, type_identity_t<Args>...> fmt,
+             Args&&... args) {
+  print(os, L"{}\n", fmt::format(fmt, std::forward<Args>(args)...));
+}
+
 FMT_END_NAMESPACE
 
 #endif  // FMT_OSTREAM_H_

3rd/spdlog/fmt/bundled/printf.h

@@ -33,9 +33,8 @@ template <typename Char> class basic_printf_context {
 
  public:
   using char_type = Char;
-  using parse_context_type = parse_context<Char>;
+  using parse_context_type = basic_format_parse_context<Char>;
   template <typename T> using formatter_type = printf_formatter<T>;
-  enum { builtin_types = 1 };
 
   /// Constructs a `printf_context` object. References to the arguments are
   /// stored in the context object so make sure they have appropriate lifetimes.
@@ -55,23 +54,6 @@ template <typename Char> class basic_printf_context {
 
 namespace detail {
 
-// Return the result via the out param to workaround gcc bug 77539.
-template <bool IS_CONSTEXPR, typename T, typename Ptr = const T*>
-FMT_CONSTEXPR auto find(Ptr first, Ptr last, T value, Ptr& out) -> bool {
-  for (out = first; out != last; ++out) {
-    if (*out == value) return true;
-  }
-  return false;
-}
-
-template <>
-inline auto find<false, char>(const char* first, const char* last, char value,
-                              const char*& out) -> bool {
-  out =
-      static_cast<const char*>(memchr(first, value, to_unsigned(last - first)));
-  return out != nullptr;
-}
-
 // Checks if a value fits in int - used to avoid warnings about comparing
 // signed and unsigned integers.
 template <bool IsSigned> struct int_checker {
@@ -79,7 +61,7 @@ template <bool IsSigned> struct int_checker {
     unsigned max = to_unsigned(max_value<int>());
     return value <= max;
   }
-  inline static auto fits_in_int(bool) -> bool { return true; }
+  static auto fits_in_int(bool) -> bool { return true; }
 };
 
 template <> struct int_checker<true> {
@@ -87,7 +69,7 @@ template <> struct int_checker<true> {
     return value >= (std::numeric_limits<int>::min)() &&
            value <= max_value<int>();
   }
-  inline static auto fits_in_int(int) -> bool { return true; }
+  static auto fits_in_int(int) -> bool { return true; }
 };
 
 struct printf_precision_handler {
@@ -145,19 +127,25 @@ template <typename T, typename Context> class arg_converter {
     using target_type = conditional_t<std::is_same<T, void>::value, U, T>;
     if (const_check(sizeof(target_type) <= sizeof(int))) {
       // Extra casts are used to silence warnings.
-      using unsigned_type = typename make_unsigned_or_bool<target_type>::type;
+      if (is_signed) {
-      if (is_signed)
+        auto n = static_cast<int>(static_cast<target_type>(value));
-        arg_ = static_cast<int>(static_cast<target_type>(value));
+        arg_ = detail::make_arg<Context>(n);
-      else
+      } else {
-        arg_ = static_cast<unsigned>(static_cast<unsigned_type>(value));
+        using unsigned_type = typename make_unsigned_or_bool<target_type>::type;
+        auto n = static_cast<unsigned>(static_cast<unsigned_type>(value));
+        arg_ = detail::make_arg<Context>(n);
+      }
     } else {
-      // glibc's printf doesn't sign extend arguments of smaller types:
+      if (is_signed) {
-      //   std::printf("%lld", -42);  // prints "4294967254"
+        // glibc's printf doesn't sign extend arguments of smaller types:
-      // but we don't have to do the same because it's a UB.
+        //   std::printf("%lld", -42);  // prints "4294967254"
-      if (is_signed)
+        // but we don't have to do the same because it's a UB.
-        arg_ = static_cast<long long>(value);
+        auto n = static_cast<long long>(value);
-      else
+        arg_ = detail::make_arg<Context>(n);
-        arg_ = static_cast<typename make_unsigned_or_bool<U>::type>(value);
+      } else {
+        auto n = static_cast<typename make_unsigned_or_bool<U>::type>(value);
+        arg_ = detail::make_arg<Context>(n);
+      }
     }
   }
 
@@ -184,7 +172,8 @@ template <typename Context> class char_converter {
 
   template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
   void operator()(T value) {
-    arg_ = static_cast<typename Context::char_type>(value);
+    auto c = static_cast<typename Context::char_type>(value);
+    arg_ = detail::make_arg<Context>(c);
   }
 
   template <typename T, FMT_ENABLE_IF(!std::is_integral<T>::value)>
@@ -205,13 +194,13 @@ class printf_width_handler {
   format_specs& specs_;
 
  public:
-  inline explicit printf_width_handler(format_specs& specs) : specs_(specs) {}
+  explicit printf_width_handler(format_specs& specs) : specs_(specs) {}
 
   template <typename T, FMT_ENABLE_IF(std::is_integral<T>::value)>
   auto operator()(T value) -> unsigned {
     auto width = static_cast<uint32_or_64_or_128_t<T>>(value);
     if (detail::is_negative(value)) {
-      specs_.set_align(align::left);
+      specs_.align = align::left;
       width = 0 - width;
     }
     unsigned int_max = to_unsigned(max_value<int>());
@@ -245,74 +234,69 @@ class printf_arg_formatter : public arg_formatter<Char> {
 
   void write_null_pointer(bool is_string = false) {
     auto s = this->specs;
-    s.set_type(presentation_type::none);
+    s.type = presentation_type::none;
     write_bytes<Char>(this->out, is_string ? "(null)" : "(nil)", s);
   }
 
-  template <typename T> void write(T value) {
-    detail::write<Char>(this->out, value, this->specs, this->locale);
-  }
-
  public:
   printf_arg_formatter(basic_appender<Char> iter, format_specs& s,
                        context_type& ctx)
       : base(make_arg_formatter(iter, s)), context_(ctx) {}
 
-  void operator()(monostate value) { write(value); }
+  void operator()(monostate value) { base::operator()(value); }
 
   template <typename T, FMT_ENABLE_IF(detail::is_integral<T>::value)>
   void operator()(T value) {
     // MSVC2013 fails to compile separate overloads for bool and Char so use
     // std::is_same instead.
     if (!std::is_same<T, Char>::value) {
-      write(value);
+      base::operator()(value);
       return;
     }
     format_specs s = this->specs;
-    if (s.type() != presentation_type::none &&
+    if (s.type != presentation_type::none && s.type != presentation_type::chr) {
-        s.type() != presentation_type::chr) {
       return (*this)(static_cast<int>(value));
     }
-    s.set_sign(sign::none);
+    s.sign = sign::none;
-    s.clear_alt();
+    s.alt = false;
-    s.set_fill(' ');  // Ignore '0' flag for char types.
+    s.fill = ' ';  // Ignore '0' flag for char types.
     // align::numeric needs to be overwritten here since the '0' flag is
     // ignored for non-numeric types
-    if (s.align() == align::none || s.align() == align::numeric)
+    if (s.align == align::none || s.align == align::numeric)
-      s.set_align(align::right);
+      s.align = align::right;
-    detail::write<Char>(this->out, static_cast<Char>(value), s);
+    write<Char>(this->out, static_cast<Char>(value), s);
   }
 
   template <typename T, FMT_ENABLE_IF(std::is_floating_point<T>::value)>
   void operator()(T value) {
-    write(value);
+    base::operator()(value);
   }
 
   void operator()(const char* value) {
     if (value)
-      write(value);
+      base::operator()(value);
     else
-      write_null_pointer(this->specs.type() != presentation_type::pointer);
+      write_null_pointer(this->specs.type != presentation_type::pointer);
   }
 
   void operator()(const wchar_t* value) {
     if (value)
-      write(value);
+      base::operator()(value);
     else
-      write_null_pointer(this->specs.type() != presentation_type::pointer);
+      write_null_pointer(this->specs.type != presentation_type::pointer);
   }
 
-  void operator()(basic_string_view<Char> value) { write(value); }
+  void operator()(basic_string_view<Char> value) { base::operator()(value); }
 
   void operator()(const void* value) {
     if (value)
-      write(value);
+      base::operator()(value);
     else
       write_null_pointer();
   }
 
   void operator()(typename basic_format_arg<context_type>::handle handle) {
-    auto parse_ctx = parse_context<Char>({});
+    auto parse_ctx = basic_format_parse_context<Char>({});
     handle.format(parse_ctx, context_);
   }
 };
@@ -321,14 +305,23 @@ template <typename Char>
 void parse_flags(format_specs& specs, const Char*& it, const Char* end) {
   for (; it != end; ++it) {
     switch (*it) {
-    case '-': specs.set_align(align::left); break;
+    case '-':
-    case '+': specs.set_sign(sign::plus); break;
+      specs.align = align::left;
-    case '0': specs.set_fill('0'); break;
-    case ' ':
-      if (specs.sign() != sign::plus) specs.set_sign(sign::space);
       break;
-    case '#': specs.set_alt(); break;
+    case '+':
-    default:  return;
+      specs.sign = sign::plus;
+      break;
+    case '0':
+      specs.fill = '0';
+      break;
+    case ' ':
+      if (specs.sign != sign::plus) specs.sign = sign::space;
+      break;
+    case '#':
+      specs.alt = true;
+      break;
+    default:
+      return;
     }
   }
 }
@@ -346,7 +339,7 @@ auto parse_header(const Char*& it, const Char* end, format_specs& specs,
       ++it;
       arg_index = value != -1 ? value : max_value<int>();
     } else {
-      if (c == '0') specs.set_fill('0');
+      if (c == '0') specs.fill = '0';
       if (value != 0) {
         // Nonzero value means that we parsed width and don't need to
         // parse it or flags again, so return now.
@@ -376,22 +369,43 @@ inline auto parse_printf_presentation_type(char c, type t, bool& upper)
   using pt = presentation_type;
   constexpr auto integral_set = sint_set | uint_set | bool_set | char_set;
   switch (c) {
-  case 'd': return in(t, integral_set) ? pt::dec : pt::none;
+  case 'd':
-  case 'o': return in(t, integral_set) ? pt::oct : pt::none;
+    return in(t, integral_set) ? pt::dec : pt::none;
-  case 'X': upper = true; FMT_FALLTHROUGH;
+  case 'o':
-  case 'x': return in(t, integral_set) ? pt::hex : pt::none;
+    return in(t, integral_set) ? pt::oct : pt::none;
-  case 'E': upper = true; FMT_FALLTHROUGH;
+  case 'X':
-  case 'e': return in(t, float_set) ? pt::exp : pt::none;
+    upper = true;
-  case 'F': upper = true; FMT_FALLTHROUGH;
+    FMT_FALLTHROUGH;
-  case 'f': return in(t, float_set) ? pt::fixed : pt::none;
+  case 'x':
-  case 'G': upper = true; FMT_FALLTHROUGH;
+    return in(t, integral_set) ? pt::hex : pt::none;
-  case 'g': return in(t, float_set) ? pt::general : pt::none;
+  case 'E':
-  case 'A': upper = true; FMT_FALLTHROUGH;
+    upper = true;
-  case 'a': return in(t, float_set) ? pt::hexfloat : pt::none;
+    FMT_FALLTHROUGH;
-  case 'c': return in(t, integral_set) ? pt::chr : pt::none;
+  case 'e':
-  case 's': return in(t, string_set | cstring_set) ? pt::string : pt::none;
+    return in(t, float_set) ? pt::exp : pt::none;
-  case 'p': return in(t, pointer_set | cstring_set) ? pt::pointer : pt::none;
+  case 'F':
-  default:  return pt::none;
+    upper = true;
+    FMT_FALLTHROUGH;
+  case 'f':
+    return in(t, float_set) ? pt::fixed : pt::none;
+  case 'G':
+    upper = true;
+    FMT_FALLTHROUGH;
+  case 'g':
+    return in(t, float_set) ? pt::general : pt::none;
+  case 'A':
+    upper = true;
+    FMT_FALLTHROUGH;
+  case 'a':
+    return in(t, float_set) ? pt::hexfloat : pt::none;
+  case 'c':
+    return in(t, integral_set) ? pt::chr : pt::none;
+  case 's':
+    return in(t, string_set | cstring_set) ? pt::string : pt::none;
+  case 'p':
+    return in(t, pointer_set | cstring_set) ? pt::pointer : pt::none;
+  default:
+    return pt::none;
   }
 }
 
@@ -401,7 +415,7 @@ void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
   using iterator = basic_appender<Char>;
   auto out = iterator(buf);
   auto context = basic_printf_context<Char>(out, args);
-  auto parse_ctx = parse_context<Char>(format);
+  auto parse_ctx = basic_format_parse_context<Char>(format);
 
   // Returns the argument with specified index or, if arg_index is -1, the next
   // argument.
@@ -430,7 +444,7 @@ void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
     write(out, basic_string_view<Char>(start, to_unsigned(it - 1 - start)));
 
     auto specs = format_specs();
-    specs.set_align(align::right);
+    specs.align = align::right;
 
     // Parse argument index, flags and width.
     int arg_index = parse_header(it, end, specs, get_arg);
@@ -454,9 +468,9 @@ void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
     auto arg = get_arg(arg_index);
     // For d, i, o, u, x, and X conversion specifiers, if a precision is
     // specified, the '0' flag is ignored
-    if (specs.precision >= 0 && is_integral_type(arg.type())) {
+    if (specs.precision >= 0 && arg.is_integral()) {
       // Ignore '0' for non-numeric types or if '-' present.
-      specs.set_fill(' ');
+      specs.fill = ' ';
     }
     if (specs.precision >= 0 && arg.type() == type::cstring_type) {
       auto str = arg.visit(get_cstring<Char>());
@@ -464,16 +478,15 @@ void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
       auto nul = std::find(str, str_end, Char());
       auto sv = basic_string_view<Char>(
           str, to_unsigned(nul != str_end ? nul - str : specs.precision));
-      arg = sv;
+      arg = make_arg<basic_printf_context<Char>>(sv);
     }
-    if (specs.alt() && arg.visit(is_zero_int())) specs.clear_alt();
+    if (specs.alt && arg.visit(is_zero_int())) specs.alt = false;
-    if (specs.fill_unit<Char>() == '0') {
+    if (specs.fill.template get<Char>() == '0') {
-      if (is_arithmetic_type(arg.type()) && specs.align() != align::left) {
+      if (arg.is_arithmetic() && specs.align != align::left)
-        specs.set_align(align::numeric);
+        specs.align = align::numeric;
-      } else {
+      else
-        // Ignore '0' flag for non-numeric types or if '-' flag is also present.
+        specs.fill = ' ';  // Ignore '0' flag for non-numeric types or if '-'
-        specs.set_fill(' ');
+                           // flag is also present.
-      }
     }
 
     // Parse length and convert the argument to the required type.
@@ -498,34 +511,44 @@ void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
         convert_arg<long>(arg, t);
       }
       break;
-    case 'j': convert_arg<intmax_t>(arg, t); break;
+    case 'j':
-    case 'z': convert_arg<size_t>(arg, t); break;
+      convert_arg<intmax_t>(arg, t);
-    case 't': convert_arg<std::ptrdiff_t>(arg, t); break;
+      break;
+    case 'z':
+      convert_arg<size_t>(arg, t);
+      break;
+    case 't':
+      convert_arg<std::ptrdiff_t>(arg, t);
+      break;
     case 'L':
       // printf produces garbage when 'L' is omitted for long double, no
       // need to do the same.
       break;
-    default: --it; convert_arg<void>(arg, c);
+    default:
+      --it;
+      convert_arg<void>(arg, c);
     }
 
     // Parse type.
     if (it == end) report_error("invalid format string");
     char type = static_cast<char>(*it++);
-    if (is_integral_type(arg.type())) {
+    if (arg.is_integral()) {
       // Normalize type.
       switch (type) {
       case 'i':
-      case 'u': type = 'd'; break;
+      case 'u':
+        type = 'd';
+        break;
       case 'c':
         arg.visit(char_converter<basic_printf_context<Char>>(arg));
         break;
       }
     }
     bool upper = false;
-    specs.set_type(parse_printf_presentation_type(type, arg.type(), upper));
+    specs.type = parse_printf_presentation_type(type, arg.type(), upper);
-    if (specs.type() == presentation_type::none)
+    if (specs.type == presentation_type::none)
       report_error("invalid format specifier");
-    if (upper) specs.set_upper();
+    specs.upper = upper;
 
     start = it;
 
@@ -560,7 +583,7 @@ inline auto vsprintf(basic_string_view<Char> fmt,
     -> std::basic_string<Char> {
   auto buf = basic_memory_buffer<Char>();
   detail::vprintf(buf, fmt, args);
-  return {buf.data(), buf.size()};
+  return to_string(buf);
 }
 
 /**
@@ -571,7 +594,7 @@ inline auto vsprintf(basic_string_view<Char> fmt,
  *
  *     std::string message = fmt::sprintf("The answer is %d", 42);
  */
-template <typename S, typename... T, typename Char = detail::char_t<S>>
+template <typename S, typename... T, typename Char = char_t<S>>
 inline auto sprintf(const S& fmt, const T&... args) -> std::basic_string<Char> {
   return vsprintf(detail::to_string_view(fmt),
                   fmt::make_format_args<basic_printf_context<Char>>(args...));
@@ -596,7 +619,7 @@ inline auto vfprintf(std::FILE* f, basic_string_view<Char> fmt,
  *
  *     fmt::fprintf(stderr, "Don't %s!", "panic");
  */
-template <typename S, typename... T, typename Char = detail::char_t<S>>
+template <typename S, typename... T, typename Char = char_t<S>>
 inline auto fprintf(std::FILE* f, const S& fmt, const T&... args) -> int {
   return vfprintf(f, detail::to_string_view(fmt),
                   make_printf_args<Char>(args...));

3rd/spdlog/fmt/bundled/ranges.h

@@ -44,6 +44,18 @@ template <typename T> class is_set {
       !std::is_void<decltype(check<T>(nullptr))>::value && !is_map<T>::value;
 };
 
+template <typename... Ts> struct conditional_helper {};
+
+template <typename T, typename _ = void> struct is_range_ : std::false_type {};
+
+#if !FMT_MSC_VERSION || FMT_MSC_VERSION > 1800
+
+#  define FMT_DECLTYPE_RETURN(val)  \
+    ->decltype(val) { return val; } \
+    static_assert(                  \
+        true, "")  // This makes it so that a semicolon is required after the
+                   // macro, which helps clang-format handle the formatting.
+
 // C array overload
 template <typename T, std::size_t N>
 auto range_begin(const T (&arr)[N]) -> const T* {
@@ -64,13 +76,9 @@ struct has_member_fn_begin_end_t<T, void_t<decltype(*std::declval<T>().begin()),
 
 // Member function overloads.
 template <typename T>
-auto range_begin(T&& rng) -> decltype(static_cast<T&&>(rng).begin()) {
+auto range_begin(T&& rng) FMT_DECLTYPE_RETURN(static_cast<T&&>(rng).begin());
-  return static_cast<T&&>(rng).begin();
-}
 template <typename T>
-auto range_end(T&& rng) -> decltype(static_cast<T&&>(rng).end()) {
+auto range_end(T&& rng) FMT_DECLTYPE_RETURN(static_cast<T&&>(rng).end());
-  return static_cast<T&&>(rng).end();
-}
 
 // ADL overloads. Only participate in overload resolution if member functions
 // are not found.
@@ -107,16 +115,17 @@ struct has_mutable_begin_end<
               // SFINAE properly unless there are distinct types
               int>> : std::true_type {};
 
-template <typename T, typename _ = void> struct is_range_ : std::false_type {};
 template <typename T>
 struct is_range_<T, void>
     : std::integral_constant<bool, (has_const_begin_end<T>::value ||
                                     has_mutable_begin_end<T>::value)> {};
+#  undef FMT_DECLTYPE_RETURN
+#endif
 
 // tuple_size and tuple_element check.
 template <typename T> class is_tuple_like_ {
-  template <typename U, typename V = typename std::remove_cv<U>::type>
+  template <typename U>
-  static auto check(U* p) -> decltype(std::tuple_size<V>::value, 0);
+  static auto check(U* p) -> decltype(std::tuple_size<U>::value, int());
   template <typename> static void check(...);
 
  public:
@@ -257,12 +266,12 @@ template <range_format K>
 using range_format_constant = std::integral_constant<range_format, K>;
 
 // These are not generic lambdas for compatibility with C++11.
-template <typename Char> struct parse_empty_specs {
+template <typename ParseContext> struct parse_empty_specs {
   template <typename Formatter> FMT_CONSTEXPR void operator()(Formatter& f) {
     f.parse(ctx);
     detail::maybe_set_debug_format(f, true);
   }
-  parse_context<Char>& ctx;
+  ParseContext& ctx;
 };
 template <typename FormatContext> struct format_tuple_element {
   using char_type = typename FormatContext::char_type;
@@ -318,17 +327,11 @@ struct formatter<Tuple, Char,
     closing_bracket_ = close;
   }
 
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  template <typename ParseContext>
+  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
     auto it = ctx.begin();
-    auto end = ctx.end();
+    if (it != ctx.end() && *it != '}') report_error("invalid format specifier");
-    if (it != end && detail::to_ascii(*it) == 'n') {
+    detail::for_each(formatters_, detail::parse_empty_specs<ParseContext>{ctx});
-      ++it;
-      set_brackets({}, {});
-      set_separator({});
-    }
-    if (it != end && *it != '}') report_error("invalid format specifier");
-    ctx.advance_to(it);
-    detail::for_each(formatters_, detail::parse_empty_specs<Char>{ctx});
     return it;
   }
 
@@ -349,17 +352,38 @@ template <typename T, typename Char> struct is_range {
 };
 
 namespace detail {
+template <typename Context> struct range_mapper {
+  using mapper = arg_mapper<Context>;
+
+  template <typename T,
+            FMT_ENABLE_IF(has_formatter<remove_cvref_t<T>, Context>::value)>
+  static auto map(T&& value) -> T&& {
+    return static_cast<T&&>(value);
+  }
+  template <typename T,
+            FMT_ENABLE_IF(!has_formatter<remove_cvref_t<T>, Context>::value)>
+  static auto map(T&& value)
+      -> decltype(mapper().map(static_cast<T&&>(value))) {
+    return mapper().map(static_cast<T&&>(value));
+  }
+};
 
 template <typename Char, typename Element>
-using range_formatter_type = formatter<remove_cvref_t<Element>, Char>;
+using range_formatter_type =
+    formatter<remove_cvref_t<decltype(range_mapper<buffered_context<Char>>{}
+                                          .map(std::declval<Element>()))>,
+              Char>;
 
 template <typename R>
 using maybe_const_range =
     conditional_t<has_const_begin_end<R>::value, const R, R>;
 
+// Workaround a bug in MSVC 2015 and earlier.
+#if !FMT_MSC_VERSION || FMT_MSC_VERSION >= 1910
 template <typename R, typename Char>
 struct is_formattable_delayed
     : is_formattable<uncvref_type<maybe_const_range<R>>, Char> {};
+#endif
 }  // namespace detail
 
 template <typename...> struct conjunction : std::true_type {};
@@ -391,7 +415,7 @@ struct range_formatter<
     auto buf = basic_memory_buffer<Char>();
     for (; it != end; ++it) buf.push_back(*it);
     auto specs = format_specs();
-    specs.set_type(presentation_type::debug);
+    specs.type = presentation_type::debug;
     return detail::write<Char>(
         out, basic_string_view<Char>(buf.data(), buf.size()), specs);
   }
@@ -419,7 +443,8 @@ struct range_formatter<
     closing_bracket_ = close;
   }
 
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  template <typename ParseContext>
+  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
     auto it = ctx.begin();
     auto end = ctx.end();
     detail::maybe_set_debug_format(underlying_, true);
@@ -461,6 +486,7 @@ struct range_formatter<
 
   template <typename R, typename FormatContext>
   auto format(R&& range, FormatContext& ctx) const -> decltype(ctx.out()) {
+    auto mapper = detail::range_mapper<buffered_context<Char>>();
     auto out = ctx.out();
     auto it = detail::range_begin(range);
     auto end = detail::range_end(range);
@@ -472,7 +498,7 @@ struct range_formatter<
       if (i > 0) out = detail::copy<Char>(separator_, out);
       ctx.advance_to(out);
       auto&& item = *it;  // Need an lvalue
-      out = underlying_.format(item, ctx);
+      out = underlying_.format(mapper.map(item), ctx);
       ++i;
     }
     out = detail::copy<Char>(closing_bracket_, out);
@@ -495,8 +521,13 @@ struct formatter<
             range_format_kind<R, Char>::value != range_format::disabled &&
             range_format_kind<R, Char>::value != range_format::map &&
             range_format_kind<R, Char>::value != range_format::string &&
-            range_format_kind<R, Char>::value != range_format::debug_string>,
+            range_format_kind<R, Char>::value != range_format::debug_string>
-        detail::is_formattable_delayed<R, Char>>::value>> {
+// Workaround a bug in MSVC 2015 and earlier.
+#if !FMT_MSC_VERSION || FMT_MSC_VERSION >= 1910
+        ,
+        detail::is_formattable_delayed<R, Char>
+#endif
+        >::value>> {
  private:
   using range_type = detail::maybe_const_range<R>;
   range_formatter<detail::uncvref_type<range_type>, Char> range_formatter_;
@@ -512,7 +543,8 @@ struct formatter<
                                   detail::string_literal<Char, '}'>{});
   }
 
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  template <typename ParseContext>
+  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
     return range_formatter_.parse(ctx);
   }
 
@@ -539,7 +571,8 @@ struct formatter<
  public:
   FMT_CONSTEXPR formatter() {}
 
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  template <typename ParseContext>
+  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
     auto it = ctx.begin();
     auto end = ctx.end();
     if (it != end) {
@@ -553,7 +586,7 @@ struct formatter<
       }
       ctx.advance_to(it);
     }
-    detail::for_each(formatters_, detail::parse_empty_specs<Char>{ctx});
+    detail::for_each(formatters_, detail::parse_empty_specs<ParseContext>{ctx});
     return it;
   }
 
@@ -563,11 +596,12 @@ struct formatter<
     basic_string_view<Char> open = detail::string_literal<Char, '{'>{};
     if (!no_delimiters_) out = detail::copy<Char>(open, out);
     int i = 0;
+    auto mapper = detail::range_mapper<buffered_context<Char>>();
     basic_string_view<Char> sep = detail::string_literal<Char, ',', ' '>{};
     for (auto&& value : map) {
       if (i > 0) out = detail::copy<Char>(sep, out);
       ctx.advance_to(out);
-      detail::for_each2(formatters_, value,
+      detail::for_each2(formatters_, mapper.map(value),
                         detail::format_tuple_element<FormatContext>{
                             0, ctx, detail::string_literal<Char, ':', ' '>{}});
       ++i;
@@ -597,7 +631,8 @@ struct formatter<
   formatter<string_type, Char> underlying_;
 
  public:
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  template <typename ParseContext>
+  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
     return underlying_.parse(ctx);
   }
 
@@ -638,22 +673,22 @@ struct formatter<join_view<It, Sentinel, Char>, Char> {
 #endif
   formatter<remove_cvref_t<value_type>, Char> value_formatter_;
 
-  using view = conditional_t<std::is_copy_constructible<It>::value,
+  using view_ref = conditional_t<std::is_copy_constructible<It>::value,
-                             const join_view<It, Sentinel, Char>,
+                                 const join_view<It, Sentinel, Char>&,
-                             join_view<It, Sentinel, Char>>;
+                                 join_view<It, Sentinel, Char>&&>;
 
  public:
   using nonlocking = void;
 
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  template <typename ParseContext>
+  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> const Char* {
     return value_formatter_.parse(ctx);
   }
 
   template <typename FormatContext>
-  auto format(view& value, FormatContext& ctx) const -> decltype(ctx.out()) {
+  auto format(view_ref& value, FormatContext& ctx) const
-    using iter =
+      -> decltype(ctx.out()) {
-        conditional_t<std::is_copy_constructible<view>::value, It, It&>;
+    auto it = std::forward<view_ref>(value).begin;
-    iter it = value.begin;
     auto out = ctx.out();
     if (it == value.end) return out;
     out = value_formatter_.format(*it, ctx);
@@ -668,11 +703,39 @@ struct formatter<join_view<It, Sentinel, Char>, Char> {
   }
 };
 
-template <typename Char, typename Tuple> struct tuple_join_view : detail::view {
+/// Returns a view that formats the iterator range `[begin, end)` with elements
-  const Tuple& tuple;
+/// separated by `sep`.
+template <typename It, typename Sentinel>
+auto join(It begin, Sentinel end, string_view sep) -> join_view<It, Sentinel> {
+  return {std::move(begin), end, sep};
+}
+
+/**
+ * Returns a view that formats `range` with elements separated by `sep`.
+ *
+ * **Example**:
+ *
+ *     auto v = std::vector<int>{1, 2, 3};
+ *     fmt::print("{}", fmt::join(v, ", "));
+ *     // Output: 1, 2, 3
+ *
+ * `fmt::join` applies passed format specifiers to the range elements:
+ *
+ *     fmt::print("{:02}", fmt::join(v, ", "));
+ *     // Output: 01, 02, 03
+ */
+template <typename Range>
+auto join(Range&& r, string_view sep)
+    -> join_view<decltype(detail::range_begin(r)),
+                 decltype(detail::range_end(r))> {
+  return {detail::range_begin(r), detail::range_end(r), sep};
+}
+
+template <typename Char, typename... T> struct tuple_join_view : detail::view {
+  const std::tuple<T...>& tuple;
   basic_string_view<Char> sep;
 
-  tuple_join_view(const Tuple& t, basic_string_view<Char> s)
+  tuple_join_view(const std::tuple<T...>& t, basic_string_view<Char> s)
       : tuple(t), sep{s} {}
 };
 
@@ -683,36 +746,37 @@ template <typename Char, typename Tuple> struct tuple_join_view : detail::view {
 #  define FMT_TUPLE_JOIN_SPECIFIERS 0
 #endif
 
-template <typename Char, typename Tuple>
+template <typename Char, typename... T>
-struct formatter<tuple_join_view<Char, Tuple>, Char,
+struct formatter<tuple_join_view<Char, T...>, Char> {
-                 enable_if_t<is_tuple_like<Tuple>::value>> {
+  template <typename ParseContext>
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
-    return do_parse(ctx, std::tuple_size<Tuple>());
+    return do_parse(ctx, std::integral_constant<size_t, sizeof...(T)>());
   }
 
   template <typename FormatContext>
-  auto format(const tuple_join_view<Char, Tuple>& value,
+  auto format(const tuple_join_view<Char, T...>& value,
               FormatContext& ctx) const -> typename FormatContext::iterator {
-    return do_format(value, ctx, std::tuple_size<Tuple>());
+    return do_format(value, ctx,
+                     std::integral_constant<size_t, sizeof...(T)>());
   }
 
  private:
-  decltype(detail::tuple::get_formatters<Tuple, Char>(
+  std::tuple<formatter<typename std::decay<T>::type, Char>...> formatters_;
-      detail::tuple_index_sequence<Tuple>())) formatters_;
 
-  FMT_CONSTEXPR auto do_parse(parse_context<Char>& ctx,
+  template <typename ParseContext>
+  FMT_CONSTEXPR auto do_parse(ParseContext& ctx,
                               std::integral_constant<size_t, 0>)
-      -> const Char* {
+      -> decltype(ctx.begin()) {
     return ctx.begin();
   }
 
-  template <size_t N>
+  template <typename ParseContext, size_t N>
-  FMT_CONSTEXPR auto do_parse(parse_context<Char>& ctx,
+  FMT_CONSTEXPR auto do_parse(ParseContext& ctx,
                               std::integral_constant<size_t, N>)
-      -> const Char* {
+      -> decltype(ctx.begin()) {
     auto end = ctx.begin();
 #if FMT_TUPLE_JOIN_SPECIFIERS
-    end = std::get<std::tuple_size<Tuple>::value - N>(formatters_).parse(ctx);
+    end = std::get<sizeof...(T) - N>(formatters_).parse(ctx);
     if (N > 1) {
       auto end1 = do_parse(ctx, std::integral_constant<size_t, N - 1>());
       if (end != end1)
@@ -723,20 +787,18 @@ struct formatter<tuple_join_view<Char, Tuple>, Char,
   }
 
   template <typename FormatContext>
-  auto do_format(const tuple_join_view<Char, Tuple>&, FormatContext& ctx,
+  auto do_format(const tuple_join_view<Char, T...>&, FormatContext& ctx,
                  std::integral_constant<size_t, 0>) const ->
       typename FormatContext::iterator {
     return ctx.out();
   }
 
   template <typename FormatContext, size_t N>
-  auto do_format(const tuple_join_view<Char, Tuple>& value, FormatContext& ctx,
+  auto do_format(const tuple_join_view<Char, T...>& value, FormatContext& ctx,
                  std::integral_constant<size_t, N>) const ->
       typename FormatContext::iterator {
-    using std::get;
+    auto out = std::get<sizeof...(T) - N>(formatters_)
-    auto out =
+                   .format(std::get<sizeof...(T) - N>(value.tuple), ctx);
-        std::get<std::tuple_size<Tuple>::value - N>(formatters_)
-            .format(get<std::tuple_size<Tuple>::value - N>(value.tuple), ctx);
     if (N <= 1) return out;
     out = detail::copy<Char>(value.sep, out);
     ctx.advance_to(out);
@@ -784,34 +846,6 @@ struct formatter<
 
 FMT_BEGIN_EXPORT
 
-/// Returns a view that formats the iterator range `[begin, end)` with elements
-/// separated by `sep`.
-template <typename It, typename Sentinel>
-auto join(It begin, Sentinel end, string_view sep) -> join_view<It, Sentinel> {
-  return {std::move(begin), end, sep};
-}
-
-/**
- * Returns a view that formats `range` with elements separated by `sep`.
- *
- * **Example**:
- *
- *     auto v = std::vector<int>{1, 2, 3};
- *     fmt::print("{}", fmt::join(v, ", "));
- *     // Output: 1, 2, 3
- *
- * `fmt::join` applies passed format specifiers to the range elements:
- *
- *     fmt::print("{:02}", fmt::join(v, ", "));
- *     // Output: 01, 02, 03
- */
-template <typename Range, FMT_ENABLE_IF(!is_tuple_like<Range>::value)>
-auto join(Range&& r, string_view sep)
-    -> join_view<decltype(detail::range_begin(r)),
-                 decltype(detail::range_end(r))> {
-  return {detail::range_begin(r), detail::range_end(r), sep};
-}
-
 /**
  * Returns an object that formats `std::tuple` with elements separated by `sep`.
  *
@@ -821,9 +855,9 @@ auto join(Range&& r, string_view sep)
  *     fmt::print("{}", fmt::join(t, ", "));
  *     // Output: 1, a
  */
-template <typename Tuple, FMT_ENABLE_IF(is_tuple_like<Tuple>::value)>
+template <typename... T>
-FMT_CONSTEXPR auto join(const Tuple& tuple, string_view sep)
+FMT_CONSTEXPR auto join(const std::tuple<T...>& tuple, string_view sep)
-    -> tuple_join_view<char, Tuple> {
+    -> tuple_join_view<char, T...> {
   return {tuple, sep};
 }
 

3rd/spdlog/fmt/bundled/std.h

@@ -17,7 +17,6 @@
 #  include <complex>
 #  include <cstdlib>
 #  include <exception>
-#  include <functional>
 #  include <memory>
 #  include <thread>
 #  include <type_traits>
@@ -27,8 +26,7 @@
 
 // Check FMT_CPLUSPLUS to suppress a bogus warning in MSVC.
 #  if FMT_CPLUSPLUS >= 201703L
-#    if FMT_HAS_INCLUDE(<filesystem>) && \
+#    if FMT_HAS_INCLUDE(<filesystem>)
-        (!defined(FMT_CPP_LIB_FILESYSTEM) || FMT_CPP_LIB_FILESYSTEM != 0)
 #      include <filesystem>
 #    endif
 #    if FMT_HAS_INCLUDE(<variant>)
@@ -124,16 +122,14 @@ template <typename Char> struct formatter<std::filesystem::path, Char> {
  public:
   FMT_CONSTEXPR void set_debug_format(bool set = true) { debug_ = set; }
 
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) {
+  template <typename ParseContext> FMT_CONSTEXPR auto parse(ParseContext& ctx) {
     auto it = ctx.begin(), end = ctx.end();
     if (it == end) return it;
 
     it = detail::parse_align(it, end, specs_);
     if (it == end) return it;
 
-    Char c = *it;
+    it = detail::parse_dynamic_spec(it, end, specs_.width, width_ref_, ctx);
-    if ((c >= '0' && c <= '9') || c == '{')
-      it = detail::parse_width(it, end, specs_, width_ref_, ctx);
     if (it != end && *it == '?') {
       debug_ = true;
       ++it;
@@ -149,8 +145,8 @@ template <typename Char> struct formatter<std::filesystem::path, Char> {
         !path_type_ ? p.native()
                     : p.generic_string<std::filesystem::path::value_type>();
 
-    detail::handle_dynamic_spec(specs.dynamic_width(), specs.width, width_ref_,
+    detail::handle_dynamic_spec<detail::width_checker>(specs.width, width_ref_,
-                                ctx);
+                                                       ctx);
     if (!debug_) {
       auto s = detail::get_path_string<Char>(p, path_string);
       return detail::write(ctx.out(), basic_string_view<Char>(s), specs);
@@ -184,8 +180,7 @@ FMT_END_NAMESPACE
 FMT_BEGIN_NAMESPACE
 FMT_EXPORT
 template <std::size_t N, typename Char>
-struct formatter<std::bitset<N>, Char>
+struct formatter<std::bitset<N>, Char> : nested_formatter<string_view> {
-    : nested_formatter<basic_string_view<Char>, Char> {
  private:
   // Functor because C++11 doesn't support generic lambdas.
   struct writer {
@@ -205,7 +200,7 @@ struct formatter<std::bitset<N>, Char>
   template <typename FormatContext>
   auto format(const std::bitset<N>& bs, FormatContext& ctx) const
       -> decltype(ctx.out()) {
-    return this->write_padded(ctx, writer{bs});
+    return write_padded(ctx, writer{bs});
   }
 };
 
@@ -238,7 +233,7 @@ struct formatter<std::optional<T>, Char,
   FMT_CONSTEXPR static void maybe_set_debug_format(U&, ...) {}
 
  public:
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) {
+  template <typename ParseContext> FMT_CONSTEXPR auto parse(ParseContext& ctx) {
     maybe_set_debug_format(underlying_, true);
     return underlying_.parse(ctx);
   }
@@ -282,10 +277,10 @@ FMT_BEGIN_NAMESPACE
 FMT_EXPORT
 template <typename T, typename E, typename Char>
 struct formatter<std::expected<T, E>, Char,
-                 std::enable_if_t<(std::is_void<T>::value ||
+                 std::enable_if_t<is_formattable<T, Char>::value &&
-                                   is_formattable<T, Char>::value) &&
                                   is_formattable<E, Char>::value>> {
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  template <typename ParseContext>
+  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
     return ctx.begin();
   }
 
@@ -296,8 +291,7 @@ struct formatter<std::expected<T, E>, Char,
 
     if (value.has_value()) {
       out = detail::write<Char>(out, "expected(");
-      if constexpr (!std::is_void<T>::value)
+      out = detail::write_escaped_alternative<Char>(out, *value);
-        out = detail::write_escaped_alternative<Char>(out, *value);
     } else {
       out = detail::write<Char>(out, "unexpected(");
       out = detail::write_escaped_alternative<Char>(out, value.error());
@@ -313,7 +307,9 @@ FMT_END_NAMESPACE
 FMT_BEGIN_NAMESPACE
 FMT_EXPORT
 template <> struct formatter<std::source_location> {
-  FMT_CONSTEXPR auto parse(parse_context<>& ctx) { return ctx.begin(); }
+  template <typename ParseContext> FMT_CONSTEXPR auto parse(ParseContext& ctx) {
+    return ctx.begin();
+  }
 
   template <typename FormatContext>
   auto format(const std::source_location& loc, FormatContext& ctx) const
@@ -369,7 +365,8 @@ template <typename T, typename C> struct is_variant_formattable {
 
 FMT_EXPORT
 template <typename Char> struct formatter<std::monostate, Char> {
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  template <typename ParseContext>
+  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
     return ctx.begin();
   }
 
@@ -386,7 +383,8 @@ struct formatter<
     Variant, Char,
     std::enable_if_t<std::conjunction_v<
         is_variant_like<Variant>, is_variant_formattable<Variant, Char>>>> {
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  template <typename ParseContext>
+  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
     return ctx.begin();
   }
 
@@ -415,37 +413,20 @@ FMT_END_NAMESPACE
 
 FMT_BEGIN_NAMESPACE
 FMT_EXPORT
-template <> struct formatter<std::error_code> {
+template <typename Char> struct formatter<std::error_code, Char> {
- private:
+  template <typename ParseContext>
-  format_specs specs_;
+  FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
-  detail::arg_ref<char> width_ref_;
+    return ctx.begin();
-
- public:
-  FMT_CONSTEXPR auto parse(parse_context<>& ctx) -> const char* {
-    auto it = ctx.begin(), end = ctx.end();
-    if (it == end) return it;
-
-    it = detail::parse_align(it, end, specs_);
-    if (it == end) return it;
-
-    char c = *it;
-    if ((c >= '0' && c <= '9') || c == '{')
-      it = detail::parse_width(it, end, specs_, width_ref_, ctx);
-    return it;
   }
 
   template <typename FormatContext>
-  FMT_CONSTEXPR20 auto format(const std::error_code& ec,
+  FMT_CONSTEXPR auto format(const std::error_code& ec, FormatContext& ctx) const
-                              FormatContext& ctx) const -> decltype(ctx.out()) {
+      -> decltype(ctx.out()) {
-    auto specs = specs_;
+    auto out = ctx.out();
-    detail::handle_dynamic_spec(specs.dynamic_width(), specs.width, width_ref_,
+    out = detail::write_bytes<Char>(out, ec.category().name(), format_specs());
-                                ctx);
+    out = detail::write<Char>(out, Char(':'));
-    memory_buffer buf;
+    out = detail::write<Char>(out, ec.value());
-    buf.append(string_view(ec.category().name()));
+    return out;
-    buf.push_back(':');
-    detail::write<char>(appender(buf), ec.value());
-    return detail::write<char>(ctx.out(), string_view(buf.data(), buf.size()),
-                               specs);
   }
 };
 
@@ -525,7 +506,8 @@ template <typename Char>
 struct formatter<std::type_info, Char  // DEPRECATED! Mixing code unit types.
                  > {
  public:
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  FMT_CONSTEXPR auto parse(basic_format_parse_context<Char>& ctx)
+      -> decltype(ctx.begin()) {
     return ctx.begin();
   }
 
@@ -546,7 +528,8 @@ struct formatter<
   bool with_typename_ = false;
 
  public:
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  FMT_CONSTEXPR auto parse(basic_format_parse_context<Char>& ctx)
+      -> decltype(ctx.begin()) {
     auto it = ctx.begin();
     auto end = ctx.end();
     if (it == end || *it == '}') return it;
@@ -660,7 +643,7 @@ template <typename T, typename Char> struct formatter<std::complex<T>, Char> {
     if (c.real() != 0) {
       *out++ = Char('(');
       out = detail::write<Char>(out, c.real(), specs, ctx.locale());
-      specs.set_sign(sign::plus);
+      specs.sign = sign::plus;
       out = detail::write<Char>(out, c.imag(), specs, ctx.locale());
       if (!detail::isfinite(c.imag())) *out++ = Char(' ');
       *out++ = Char('i');
@@ -674,7 +657,8 @@ template <typename T, typename Char> struct formatter<std::complex<T>, Char> {
   }
 
  public:
-  FMT_CONSTEXPR auto parse(parse_context<Char>& ctx) -> const Char* {
+  FMT_CONSTEXPR auto parse(basic_format_parse_context<Char>& ctx)
+      -> decltype(ctx.begin()) {
     if (ctx.begin() == ctx.end() || *ctx.begin() == '}') return ctx.begin();
     return parse_format_specs(ctx.begin(), ctx.end(), specs_, ctx,
                               detail::type_constant<T, Char>::value);
@@ -684,11 +668,12 @@ template <typename T, typename Char> struct formatter<std::complex<T>, Char> {
   auto format(const std::complex<T>& c, FormatContext& ctx) const
       -> decltype(ctx.out()) {
     auto specs = specs_;
-    if (specs.dynamic()) {
+    if (specs.width_ref.kind != detail::arg_id_kind::none ||
-      detail::handle_dynamic_spec(specs.dynamic_width(), specs.width,
+        specs.precision_ref.kind != detail::arg_id_kind::none) {
-                                  specs.width_ref, ctx);
+      detail::handle_dynamic_spec<detail::width_checker>(specs.width,
-      detail::handle_dynamic_spec(specs.dynamic_precision(), specs.precision,
+                                                         specs.width_ref, ctx);
-                                  specs.precision_ref, ctx);
+      detail::handle_dynamic_spec<detail::precision_checker>(
+          specs.precision, specs.precision_ref, ctx);
     }
 
     if (specs.width == 0) return do_format(c, specs, ctx, ctx.out());
@@ -696,12 +681,12 @@ template <typename T, typename Char> struct formatter<std::complex<T>, Char> {
 
     auto outer_specs = format_specs();
     outer_specs.width = specs.width;
-    outer_specs.copy_fill_from(specs);
+    outer_specs.fill = specs.fill;
-    outer_specs.set_align(specs.align());
+    outer_specs.align = specs.align;
 
     specs.width = 0;
-    specs.set_fill({});
+    specs.fill = {};
-    specs.set_align(align::none);
+    specs.align = align::none;
 
     do_format(c, specs, ctx, basic_appender<Char>(buf));
     return detail::write<Char>(ctx.out(),
@@ -710,17 +695,5 @@ template <typename T, typename Char> struct formatter<std::complex<T>, Char> {
   }
 };
 
-FMT_EXPORT
-template <typename T, typename Char>
-struct formatter<std::reference_wrapper<T>, Char,
-                 enable_if_t<is_formattable<remove_cvref_t<T>, Char>::value>>
-    : formatter<remove_cvref_t<T>, Char> {
-  template <typename FormatContext>
-  auto format(std::reference_wrapper<T> ref, FormatContext& ctx) const
-      -> decltype(ctx.out()) {
-    return formatter<remove_cvref_t<T>, Char>::format(ref.get(), ctx);
-  }
-};
-
 FMT_END_NAMESPACE
 #endif  // FMT_STD_H_

3rd/spdlog/fmt/bundled/xchar.h

@@ -10,12 +10,11 @@
 
 #include "color.h"
 #include "format.h"
-#include "ostream.h"
 #include "ranges.h"
 
 #ifndef FMT_MODULE
 #  include <cwchar>
-#  if FMT_USE_LOCALE
+#  if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)
 #    include <locale>
 #  endif
 #endif
@@ -35,8 +34,7 @@ struct format_string_char<
 };
 
 template <typename S>
-struct format_string_char<
+struct format_string_char<S, enable_if_t<is_compile_string<S>::value>> {
-    S, enable_if_t<std::is_base_of<detail::compile_string, S>::value>> {
   using type = typename S::char_type;
 };
 
@@ -45,7 +43,7 @@ using format_string_char_t = typename format_string_char<S>::type;
 
 inline auto write_loc(basic_appender<wchar_t> out, loc_value value,
                       const format_specs& specs, locale_ref loc) -> bool {
-#if FMT_USE_LOCALE
+#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
   auto& numpunct =
       std::use_facet<std::numpunct<wchar_t>>(loc.get<std::locale>());
   auto separator = std::wstring();
@@ -60,64 +58,30 @@ inline auto write_loc(basic_appender<wchar_t> out, loc_value value,
 FMT_BEGIN_EXPORT
 
 using wstring_view = basic_string_view<wchar_t>;
-using wformat_parse_context = parse_context<wchar_t>;
+using wformat_parse_context = basic_format_parse_context<wchar_t>;
 using wformat_context = buffered_context<wchar_t>;
 using wformat_args = basic_format_args<wformat_context>;
 using wmemory_buffer = basic_memory_buffer<wchar_t>;
 
-template <typename Char, typename... T> struct basic_fstring {
+#if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
- private:
+// Workaround broken conversion on older gcc.
-  basic_string_view<Char> str_;
+template <typename... Args> using wformat_string = wstring_view;
-
+inline auto runtime(wstring_view s) -> wstring_view { return s; }
-  static constexpr int num_static_named_args =
+#else
-      detail::count_static_named_args<T...>();
+template <typename... Args>
-
+using wformat_string = basic_format_string<wchar_t, type_identity_t<Args>...>;
-  using checker = detail::format_string_checker<
-      Char, static_cast<int>(sizeof...(T)), num_static_named_args,
-      num_static_named_args != detail::count_named_args<T...>()>;
-
-  using arg_pack = detail::arg_pack<T...>;
-
- public:
-  using t = basic_fstring;
-
-  template <typename S,
-            FMT_ENABLE_IF(
-                std::is_convertible<const S&, basic_string_view<Char>>::value)>
-  FMT_CONSTEVAL FMT_ALWAYS_INLINE basic_fstring(const S& s) : str_(s) {
-    if (FMT_USE_CONSTEVAL)
-      detail::parse_format_string<Char>(s, checker(s, arg_pack()));
-  }
-  template <typename S,
-            FMT_ENABLE_IF(std::is_base_of<detail::compile_string, S>::value&&
-                              std::is_same<typename S::char_type, Char>::value)>
-  FMT_ALWAYS_INLINE basic_fstring(const S&) : str_(S()) {
-    FMT_CONSTEXPR auto sv = basic_string_view<Char>(S());
-    FMT_CONSTEXPR int ignore =
-        (parse_format_string(sv, checker(sv, arg_pack())), 0);
-    detail::ignore_unused(ignore);
-  }
-  basic_fstring(runtime_format_string<Char> fmt) : str_(fmt.str) {}
-
-  operator basic_string_view<Char>() const { return str_; }
-  auto get() const -> basic_string_view<Char> { return str_; }
-};
-
-template <typename Char, typename... T>
-using basic_format_string = basic_fstring<Char, T...>;
-
-template <typename... T>
-using wformat_string = typename basic_format_string<wchar_t, T...>::t;
 inline auto runtime(wstring_view s) -> runtime_format_string<wchar_t> {
   return {{s}};
 }
+#endif
 
 template <> struct is_char<wchar_t> : std::true_type {};
 template <> struct is_char<char16_t> : std::true_type {};
 template <> struct is_char<char32_t> : std::true_type {};
 
 #ifdef __cpp_char8_t
-template <> struct is_char<char8_t> : bool_constant<detail::is_utf8_enabled> {};
+template <>
+struct is_char<char8_t> : bool_constant<detail::is_utf8_enabled()> {};
 #endif
 
 template <typename... T>
@@ -126,13 +90,14 @@ constexpr auto make_wformat_args(T&... args)
   return fmt::make_format_args<wformat_context>(args...);
 }
 
-#if !FMT_USE_NONTYPE_TEMPLATE_ARGS
 inline namespace literals {
-inline auto operator""_a(const wchar_t* s, size_t) -> detail::udl_arg<wchar_t> {
+#if FMT_USE_USER_DEFINED_LITERALS && !FMT_USE_NONTYPE_TEMPLATE_ARGS
+constexpr auto operator""_a(const wchar_t* s, size_t)
+    -> detail::udl_arg<wchar_t> {
   return {s};
 }
-}  // namespace literals
 #endif
+}  // namespace literals
 
 template <typename It, typename Sentinel>
 auto join(It begin, Sentinel end, wstring_view sep)
@@ -140,9 +105,9 @@ auto join(It begin, Sentinel end, wstring_view sep)
   return {begin, end, sep};
 }
 
-template <typename Range, FMT_ENABLE_IF(!is_tuple_like<Range>::value)>
+template <typename Range>
 auto join(Range&& range, wstring_view sep)
-    -> join_view<decltype(std::begin(range)), decltype(std::end(range)),
+    -> join_view<detail::iterator_t<Range>, detail::sentinel_t<Range>,
                  wchar_t> {
   return join(std::begin(range), std::end(range), sep);
 }
@@ -153,19 +118,19 @@ auto join(std::initializer_list<T> list, wstring_view sep)
   return join(std::begin(list), std::end(list), sep);
 }
 
-template <typename Tuple, FMT_ENABLE_IF(is_tuple_like<Tuple>::value)>
+template <typename... T>
-auto join(const Tuple& tuple, basic_string_view<wchar_t> sep)
+auto join(const std::tuple<T...>& tuple, basic_string_view<wchar_t> sep)
-    -> tuple_join_view<wchar_t, Tuple> {
+    -> tuple_join_view<wchar_t, T...> {
   return {tuple, sep};
 }
 
 template <typename Char, FMT_ENABLE_IF(!std::is_same<Char, char>::value)>
-auto vformat(basic_string_view<Char> fmt,
+auto vformat(basic_string_view<Char> format_str,
              typename detail::vformat_args<Char>::type args)
     -> std::basic_string<Char> {
   auto buf = basic_memory_buffer<Char>();
-  detail::vformat_to(buf, fmt, args);
+  detail::vformat_to(buf, format_str, args);
-  return {buf.data(), buf.size()};
+  return to_string(buf);
 }
 
 template <typename... T>
@@ -186,8 +151,8 @@ template <typename S, typename... T,
           typename Char = detail::format_string_char_t<S>,
           FMT_ENABLE_IF(!std::is_same<Char, char>::value &&
                         !std::is_same<Char, wchar_t>::value)>
-auto format(const S& fmt, T&&... args) -> std::basic_string<Char> {
+auto format(const S& format_str, T&&... args) -> std::basic_string<Char> {
-  return vformat(detail::to_string_view(fmt),
+  return vformat(detail::to_string_view(format_str),
                  fmt::make_format_args<buffered_context<Char>>(args...));
 }
 
@@ -195,33 +160,31 @@ template <typename Locale, typename S,
           typename Char = detail::format_string_char_t<S>,
           FMT_ENABLE_IF(detail::is_locale<Locale>::value&&
                             detail::is_exotic_char<Char>::value)>
-inline auto vformat(const Locale& loc, const S& fmt,
+inline auto vformat(const Locale& loc, const S& format_str,
                     typename detail::vformat_args<Char>::type args)
     -> std::basic_string<Char> {
-  auto buf = basic_memory_buffer<Char>();
+  return detail::vformat(loc, detail::to_string_view(format_str), args);
-  detail::vformat_to(buf, detail::to_string_view(fmt), args,
-                     detail::locale_ref(loc));
-  return {buf.data(), buf.size()};
 }
 
 template <typename Locale, typename S, typename... T,
           typename Char = detail::format_string_char_t<S>,
           FMT_ENABLE_IF(detail::is_locale<Locale>::value&&
                             detail::is_exotic_char<Char>::value)>
-inline auto format(const Locale& loc, const S& fmt, T&&... args)
+inline auto format(const Locale& loc, const S& format_str, T&&... args)
     -> std::basic_string<Char> {
-  return vformat(loc, detail::to_string_view(fmt),
+  return detail::vformat(
-                 fmt::make_format_args<buffered_context<Char>>(args...));
+      loc, detail::to_string_view(format_str),
+      fmt::make_format_args<buffered_context<Char>>(args...));
 }
 
 template <typename OutputIt, typename S,
           typename Char = detail::format_string_char_t<S>,
           FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&&
                             detail::is_exotic_char<Char>::value)>
-auto vformat_to(OutputIt out, const S& fmt,
+auto vformat_to(OutputIt out, const S& format_str,
                 typename detail::vformat_args<Char>::type args) -> OutputIt {
   auto&& buf = detail::get_buffer<Char>(out);
-  detail::vformat_to(buf, detail::to_string_view(fmt), args);
+  detail::vformat_to(buf, detail::to_string_view(format_str), args);
   return detail::get_iterator(buf, out);
 }
 
@@ -240,35 +203,37 @@ template <typename Locale, typename S, typename OutputIt, typename... Args,
           FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&&
                             detail::is_locale<Locale>::value&&
                                 detail::is_exotic_char<Char>::value)>
-inline auto vformat_to(OutputIt out, const Locale& loc, const S& fmt,
+inline auto vformat_to(OutputIt out, const Locale& loc, const S& format_str,
                        typename detail::vformat_args<Char>::type args)
     -> OutputIt {
   auto&& buf = detail::get_buffer<Char>(out);
-  vformat_to(buf, detail::to_string_view(fmt), args, detail::locale_ref(loc));
+  vformat_to(buf, detail::to_string_view(format_str), args,
+             detail::locale_ref(loc));
   return detail::get_iterator(buf, out);
 }
 
-template <typename Locale, typename OutputIt, typename S, typename... T,
+template <typename OutputIt, typename Locale, typename S, typename... T,
           typename Char = detail::format_string_char_t<S>,
           bool enable = detail::is_output_iterator<OutputIt, Char>::value &&
                         detail::is_locale<Locale>::value &&
                         detail::is_exotic_char<Char>::value>
-inline auto format_to(OutputIt out, const Locale& loc, const S& fmt,
+inline auto format_to(OutputIt out, const Locale& loc, const S& format_str,
                       T&&... args) ->
     typename std::enable_if<enable, OutputIt>::type {
-  return vformat_to(out, loc, detail::to_string_view(fmt),
+  return vformat_to(out, loc, detail::to_string_view(format_str),
                     fmt::make_format_args<buffered_context<Char>>(args...));
 }
 
 template <typename OutputIt, typename Char, typename... Args,
           FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value&&
                             detail::is_exotic_char<Char>::value)>
-inline auto vformat_to_n(OutputIt out, size_t n, basic_string_view<Char> fmt,
+inline auto vformat_to_n(OutputIt out, size_t n,
+                         basic_string_view<Char> format_str,
                          typename detail::vformat_args<Char>::type args)
     -> format_to_n_result<OutputIt> {
   using traits = detail::fixed_buffer_traits;
   auto buf = detail::iterator_buffer<OutputIt, Char, traits>(out, n);
-  detail::vformat_to(buf, fmt, args);
+  detail::vformat_to(buf, format_str, args);
   return {buf.out(), buf.count()};
 }
 
@@ -326,7 +291,7 @@ inline auto vformat(const text_style& ts, wstring_view fmt, wformat_args args)
     -> std::wstring {
   auto buf = wmemory_buffer();
   detail::vformat_to(buf, ts, fmt, args);
-  return {buf.data(), buf.size()};
+  return fmt::to_string(buf);
 }
 
 template <typename... T>
@@ -347,22 +312,6 @@ FMT_DEPRECATED void print(const text_style& ts, wformat_string<T...> fmt,
   return print(stdout, ts, fmt, args...);
 }
 
-inline void vprint(std::wostream& os, wstring_view fmt, wformat_args args) {
-  auto buffer = basic_memory_buffer<wchar_t>();
-  detail::vformat_to(buffer, fmt, args);
-  detail::write_buffer(os, buffer);
-}
-
-template <typename... T>
-void print(std::wostream& os, wformat_string<T...> fmt, T&&... args) {
-  vprint(os, fmt, fmt::make_format_args<buffered_context<wchar_t>>(args...));
-}
-
-template <typename... T>
-void println(std::wostream& os, wformat_string<T...> fmt, T&&... args) {
-  print(os, L"{}\n", fmt::format(fmt, std::forward<T>(args)...));
-}
-
 /// Converts `value` to `std::wstring` using the default format for type `T`.
 template <typename T> inline auto to_wstring(const T& value) -> std::wstring {
   return format(FMT_STRING(L"{}"), value);

3rd/spdlog/fmt/chrono.h

@@ -0,0 +1,23 @@
+//
+// Copyright(c) 2016 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+//
+// include bundled or external copy of fmtlib's chrono support
+//
+#include <spdlog/tweakme.h>
+
+#if !defined(SPDLOG_USE_STD_FORMAT)
+    #if !defined(SPDLOG_FMT_EXTERNAL)
+        #ifdef SPDLOG_HEADER_ONLY
+            #ifndef FMT_HEADER_ONLY
+                #define FMT_HEADER_ONLY
+            #endif
+        #endif
+        #include <spdlog/fmt/bundled/chrono.h>
+    #else
+        #include <fmt/chrono.h>
+    #endif
+#endif

3rd/spdlog/fmt/compile.h

@@ -0,0 +1,23 @@
+//
+// Copyright(c) 2016 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+//
+// include bundled or external copy of fmtlib's compile-time support
+//
+#include <spdlog/tweakme.h>
+
+#if !defined(SPDLOG_USE_STD_FORMAT)
+    #if !defined(SPDLOG_FMT_EXTERNAL)
+        #ifdef SPDLOG_HEADER_ONLY
+            #ifndef FMT_HEADER_ONLY
+                #define FMT_HEADER_ONLY
+            #endif
+        #endif
+        #include <spdlog/fmt/bundled/compile.h>
+    #else
+        #include <fmt/compile.h>
+    #endif
+#endif

3rd/spdlog/fmt/fmt.h

@@ -0,0 +1,30 @@
+//
+// Copyright(c) 2016-2018 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+
+//
+// Include a bundled header-only copy of fmtlib or an external one.
+// By default spdlog include its own copy.
+//
+#include <spdlog/tweakme.h>
+
+#if defined(SPDLOG_USE_STD_FORMAT)  // SPDLOG_USE_STD_FORMAT is defined - use std::format
+    #include <format>
+#elif !defined(SPDLOG_FMT_EXTERNAL)
+    #if !defined(SPDLOG_COMPILED_LIB) && !defined(FMT_HEADER_ONLY)
+        #define FMT_HEADER_ONLY
+    #endif
+    #ifndef FMT_USE_WINDOWS_H
+        #define FMT_USE_WINDOWS_H 0
+    #endif
+
+    #include <spdlog/fmt/bundled/core.h>
+    #include <spdlog/fmt/bundled/format.h>
+
+#else  // SPDLOG_FMT_EXTERNAL is defined - use external fmtlib
+    #include <fmt/core.h>
+    #include <fmt/format.h>
+#endif

3rd/spdlog/fmt/ostr.h

@@ -0,0 +1,23 @@
+//
+// Copyright(c) 2016 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+//
+// include bundled or external copy of fmtlib's ostream support
+//
+#include <spdlog/tweakme.h>
+
+#if !defined(SPDLOG_USE_STD_FORMAT)
+    #if !defined(SPDLOG_FMT_EXTERNAL)
+        #ifdef SPDLOG_HEADER_ONLY
+            #ifndef FMT_HEADER_ONLY
+                #define FMT_HEADER_ONLY
+            #endif
+        #endif
+        #include <spdlog/fmt/bundled/ostream.h>
+    #else
+        #include <fmt/ostream.h>
+    #endif
+#endif

3rd/spdlog/fmt/ranges.h

@@ -0,0 +1,23 @@
+//
+// Copyright(c) 2016 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+//
+// include bundled or external copy of fmtlib's ranges support
+//
+#include <spdlog/tweakme.h>
+
+#if !defined(SPDLOG_USE_STD_FORMAT)
+    #if !defined(SPDLOG_FMT_EXTERNAL)
+        #ifdef SPDLOG_HEADER_ONLY
+            #ifndef FMT_HEADER_ONLY
+                #define FMT_HEADER_ONLY
+            #endif
+        #endif
+        #include <spdlog/fmt/bundled/ranges.h>
+    #else
+        #include <fmt/ranges.h>
+    #endif
+#endif

3rd/spdlog/fmt/std.h

@@ -0,0 +1,24 @@
+//
+// Copyright(c) 2016 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+//
+// include bundled or external copy of fmtlib's std support (for formatting e.g.
+// std::filesystem::path, std::thread::id, std::monostate, std::variant, ...)
+//
+#include <spdlog/tweakme.h>
+
+#if !defined(SPDLOG_USE_STD_FORMAT)
+    #if !defined(SPDLOG_FMT_EXTERNAL)
+        #ifdef SPDLOG_HEADER_ONLY
+            #ifndef FMT_HEADER_ONLY
+                #define FMT_HEADER_ONLY
+            #endif
+        #endif
+        #include <spdlog/fmt/bundled/std.h>
+    #else
+        #include <fmt/std.h>
+    #endif
+#endif

3rd/spdlog/fmt/xchar.h

@@ -0,0 +1,23 @@
+//
+// Copyright(c) 2016 Gabi Melman.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+//
+
+#pragma once
+//
+// include bundled or external copy of fmtlib's xchar support
+//
+#include <spdlog/tweakme.h>
+
+#if !defined(SPDLOG_USE_STD_FORMAT)
+    #if !defined(SPDLOG_FMT_EXTERNAL)
+        #ifdef SPDLOG_HEADER_ONLY
+            #ifndef FMT_HEADER_ONLY
+                #define FMT_HEADER_ONLY
+            #endif
+        #endif
+        #include <spdlog/fmt/bundled/xchar.h>
+    #else
+        #include <fmt/xchar.h>
+    #endif
+#endif

3rd/spdlog/formatter.h

@@ -0,0 +1,17 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/log_msg.h>
+#include <spdlog/fmt/fmt.h>
+
+namespace spdlog {
+
+class formatter {
+public:
+    virtual ~formatter() = default;
+    virtual void format(const details::log_msg &msg, memory_buf_t &dest) = 0;
+    virtual std::unique_ptr<formatter> clone() const = 0;
+};
+}  // namespace spdlog

3rd/spdlog/fwd.h

@@ -0,0 +1,18 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+namespace spdlog {
+class logger;
+class formatter;
+
+namespace sinks {
+class sink;
+}
+
+namespace level {
+enum level_enum : int;
+}
+
+}  // namespace spdlog

3rd/spdlog/logger-inl.h

@@ -0,0 +1,198 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/logger.h>
+#endif
+
+#include <spdlog/details/backtracer.h>
+#include <spdlog/pattern_formatter.h>
+#include <spdlog/sinks/sink.h>
+
+#include <cstdio>
+
+namespace spdlog {
+
+// public methods
+SPDLOG_INLINE logger::logger(const logger &other)
+    : name_(other.name_),
+      sinks_(other.sinks_),
+      level_(other.level_.load(std::memory_order_relaxed)),
+      flush_level_(other.flush_level_.load(std::memory_order_relaxed)),
+      custom_err_handler_(other.custom_err_handler_),
+      tracer_(other.tracer_) {}
+
+SPDLOG_INLINE logger::logger(logger &&other) SPDLOG_NOEXCEPT
+    : name_(std::move(other.name_)),
+      sinks_(std::move(other.sinks_)),
+      level_(other.level_.load(std::memory_order_relaxed)),
+      flush_level_(other.flush_level_.load(std::memory_order_relaxed)),
+      custom_err_handler_(std::move(other.custom_err_handler_)),
+      tracer_(std::move(other.tracer_))
+
+{}
+
+SPDLOG_INLINE logger &logger::operator=(logger other) SPDLOG_NOEXCEPT {
+    this->swap(other);
+    return *this;
+}
+
+SPDLOG_INLINE void logger::swap(spdlog::logger &other) SPDLOG_NOEXCEPT {
+    name_.swap(other.name_);
+    sinks_.swap(other.sinks_);
+
+    // swap level_
+    auto other_level = other.level_.load();
+    auto my_level = level_.exchange(other_level);
+    other.level_.store(my_level);
+
+    // swap flush level_
+    other_level = other.flush_level_.load();
+    my_level = flush_level_.exchange(other_level);
+    other.flush_level_.store(my_level);
+
+    custom_err_handler_.swap(other.custom_err_handler_);
+    std::swap(tracer_, other.tracer_);
+}
+
+SPDLOG_INLINE void swap(logger &a, logger &b) { a.swap(b); }
+
+SPDLOG_INLINE void logger::set_level(level::level_enum log_level) { level_.store(log_level); }
+
+SPDLOG_INLINE level::level_enum logger::level() const {
+    return static_cast<level::level_enum>(level_.load(std::memory_order_relaxed));
+}
+
+SPDLOG_INLINE const std::string &logger::name() const { return name_; }
+
+// set formatting for the sinks in this logger.
+// each sink will get a separate instance of the formatter object.
+SPDLOG_INLINE void logger::set_formatter(std::unique_ptr<formatter> f) {
+    for (auto it = sinks_.begin(); it != sinks_.end(); ++it) {
+        if (std::next(it) == sinks_.end()) {
+            // last element - we can be move it.
+            (*it)->set_formatter(std::move(f));
+            break;  // to prevent clang-tidy warning
+        } else {
+            (*it)->set_formatter(f->clone());
+        }
+    }
+}
+
+SPDLOG_INLINE void logger::set_pattern(std::string pattern, pattern_time_type time_type) {
+    auto new_formatter = details::make_unique<pattern_formatter>(std::move(pattern), time_type);
+    set_formatter(std::move(new_formatter));
+}
+
+// create new backtrace sink and move to it all our child sinks
+SPDLOG_INLINE void logger::enable_backtrace(size_t n_messages) { tracer_.enable(n_messages); }
+
+// restore orig sinks and level and delete the backtrace sink
+SPDLOG_INLINE void logger::disable_backtrace() { tracer_.disable(); }
+
+SPDLOG_INLINE void logger::dump_backtrace() { dump_backtrace_(); }
+
+// flush functions
+SPDLOG_INLINE void logger::flush() { flush_(); }
+
+SPDLOG_INLINE void logger::flush_on(level::level_enum log_level) { flush_level_.store(log_level); }
+
+SPDLOG_INLINE level::level_enum logger::flush_level() const {
+    return static_cast<level::level_enum>(flush_level_.load(std::memory_order_relaxed));
+}
+
+// sinks
+SPDLOG_INLINE const std::vector<sink_ptr> &logger::sinks() const { return sinks_; }
+
+SPDLOG_INLINE std::vector<sink_ptr> &logger::sinks() { return sinks_; }
+
+// error handler
+SPDLOG_INLINE void logger::set_error_handler(err_handler handler) {
+    custom_err_handler_ = std::move(handler);
+}
+
+// create new logger with same sinks and configuration.
+SPDLOG_INLINE std::shared_ptr<logger> logger::clone(std::string logger_name) {
+    auto cloned = std::make_shared<logger>(*this);
+    cloned->name_ = std::move(logger_name);
+    return cloned;
+}
+
+// protected methods
+SPDLOG_INLINE void logger::log_it_(const spdlog::details::log_msg &log_msg,
+                                   bool log_enabled,
+                                   bool traceback_enabled) {
+    if (log_enabled) {
+        sink_it_(log_msg);
+    }
+    if (traceback_enabled) {
+        tracer_.push_back(log_msg);
+    }
+}
+
+SPDLOG_INLINE void logger::sink_it_(const details::log_msg &msg) {
+    for (auto &sink : sinks_) {
+        if (sink->should_log(msg.level)) {
+            SPDLOG_TRY { sink->log(msg); }
+            SPDLOG_LOGGER_CATCH(msg.source)
+        }
+    }
+
+    if (should_flush_(msg)) {
+        flush_();
+    }
+}
+
+SPDLOG_INLINE void logger::flush_() {
+    for (auto &sink : sinks_) {
+        SPDLOG_TRY { sink->flush(); }
+        SPDLOG_LOGGER_CATCH(source_loc())
+    }
+}
+
+SPDLOG_INLINE void logger::dump_backtrace_() {
+    using details::log_msg;
+    if (tracer_.enabled() && !tracer_.empty()) {
+        sink_it_(
+            log_msg{name(), level::info, "****************** Backtrace Start ******************"});
+        tracer_.foreach_pop([this](const log_msg &msg) { this->sink_it_(msg); });
+        sink_it_(
+            log_msg{name(), level::info, "****************** Backtrace End ********************"});
+    }
+}
+
+SPDLOG_INLINE bool logger::should_flush_(const details::log_msg &msg) {
+    auto flush_level = flush_level_.load(std::memory_order_relaxed);
+    return (msg.level >= flush_level) && (msg.level != level::off);
+}
+
+SPDLOG_INLINE void logger::err_handler_(const std::string &msg) {
+    if (custom_err_handler_) {
+        custom_err_handler_(msg);
+    } else {
+        using std::chrono::system_clock;
+        static std::mutex mutex;
+        static std::chrono::system_clock::time_point last_report_time;
+        static size_t err_counter = 0;
+        std::lock_guard<std::mutex> lk{mutex};
+        auto now = system_clock::now();
+        err_counter++;
+        if (now - last_report_time < std::chrono::seconds(1)) {
+            return;
+        }
+        last_report_time = now;
+        auto tm_time = details::os::localtime(system_clock::to_time_t(now));
+        char date_buf[64];
+        std::strftime(date_buf, sizeof(date_buf), "%Y-%m-%d %H:%M:%S", &tm_time);
+#if defined(USING_R) && defined(R_R_H)  // if in R environment
+        REprintf("[*** LOG ERROR #%04zu ***] [%s] [%s] %s\n", err_counter, date_buf, name().c_str(),
+                 msg.c_str());
+#else
+        std::fprintf(stderr, "[*** LOG ERROR #%04zu ***] [%s] [%s] %s\n", err_counter, date_buf,
+                     name().c_str(), msg.c_str());
+#endif
+    }
+}
+}  // namespace spdlog

3rd/spdlog/logger.h

@@ -0,0 +1,379 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+// Thread safe logger (except for set_error_handler())
+// Has name, log level, vector of std::shared sink pointers and formatter
+// Upon each log write the logger:
+// 1. Checks if its log level is enough to log the message and if yes:
+// 2. Call the underlying sinks to do the job.
+// 3. Each sink use its own private copy of a formatter to format the message
+// and send to its destination.
+//
+// The use of private formatter per sink provides the opportunity to cache some
+// formatted data, and support for different format per sink.
+
+#include <spdlog/common.h>
+#include <spdlog/details/backtracer.h>
+#include <spdlog/details/log_msg.h>
+
+#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
+    #ifndef _WIN32
+        #error SPDLOG_WCHAR_TO_UTF8_SUPPORT only supported on windows
+    #endif
+    #include <spdlog/details/os.h>
+#endif
+
+#include <vector>
+
+#ifndef SPDLOG_NO_EXCEPTIONS
+    #define SPDLOG_LOGGER_CATCH(location)                                                 \
+        catch (const std::exception &ex) {                                                \
+            if (location.filename) {                                                      \
+                err_handler_(fmt_lib::format(SPDLOG_FMT_STRING("{} [{}({})]"), ex.what(), \
+                                             location.filename, location.line));          \
+            } else {                                                                      \
+                err_handler_(ex.what());                                                  \
+            }                                                                             \
+        }                                                                                 \
+        catch (...) {                                                                     \
+            err_handler_("Rethrowing unknown exception in logger");                       \
+            throw;                                                                        \
+        }
+#else
+    #define SPDLOG_LOGGER_CATCH(location)
+#endif
+
+namespace spdlog {
+
+class SPDLOG_API logger {
+public:
+    // Empty logger
+    explicit logger(std::string name)
+        : name_(std::move(name)),
+          sinks_() {}
+
+    // Logger with range on sinks
+    template <typename It>
+    logger(std::string name, It begin, It end)
+        : name_(std::move(name)),
+          sinks_(begin, end) {}
+
+    // Logger with single sink
+    logger(std::string name, sink_ptr single_sink)
+        : logger(std::move(name), {std::move(single_sink)}) {}
+
+    // Logger with sinks init list
+    logger(std::string name, sinks_init_list sinks)
+        : logger(std::move(name), sinks.begin(), sinks.end()) {}
+
+    virtual ~logger() = default;
+
+    logger(const logger &other);
+    logger(logger &&other) SPDLOG_NOEXCEPT;
+    logger &operator=(logger other) SPDLOG_NOEXCEPT;
+    void swap(spdlog::logger &other) SPDLOG_NOEXCEPT;
+
+    template <typename... Args>
+    void log(source_loc loc, level::level_enum lvl, format_string_t<Args...> fmt, Args &&...args) {
+        log_(loc, lvl, details::to_string_view(fmt), std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void log(level::level_enum lvl, format_string_t<Args...> fmt, Args &&...args) {
+        log(source_loc{}, lvl, fmt, std::forward<Args>(args)...);
+    }
+
+    template <typename T>
+    void log(level::level_enum lvl, const T &msg) {
+        log(source_loc{}, lvl, msg);
+    }
+
+    // T cannot be statically converted to format string (including string_view/wstring_view)
+    template <class T,
+              typename std::enable_if<!is_convertible_to_any_format_string<const T &>::value,
+                                      int>::type = 0>
+    void log(source_loc loc, level::level_enum lvl, const T &msg) {
+        log(loc, lvl, "{}", msg);
+    }
+
+    void log(log_clock::time_point log_time,
+             source_loc loc,
+             level::level_enum lvl,
+             string_view_t msg) {
+        bool log_enabled = should_log(lvl);
+        bool traceback_enabled = tracer_.enabled();
+        if (!log_enabled && !traceback_enabled) {
+            return;
+        }
+
+        details::log_msg log_msg(log_time, loc, name_, lvl, msg);
+        log_it_(log_msg, log_enabled, traceback_enabled);
+    }
+
+    void log(source_loc loc, level::level_enum lvl, string_view_t msg) {
+        bool log_enabled = should_log(lvl);
+        bool traceback_enabled = tracer_.enabled();
+        if (!log_enabled && !traceback_enabled) {
+            return;
+        }
+
+        details::log_msg log_msg(loc, name_, lvl, msg);
+        log_it_(log_msg, log_enabled, traceback_enabled);
+    }
+
+    void log(level::level_enum lvl, string_view_t msg) { log(source_loc{}, lvl, msg); }
+
+    template <typename... Args>
+    void trace(format_string_t<Args...> fmt, Args &&...args) {
+        log(level::trace, fmt, std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void debug(format_string_t<Args...> fmt, Args &&...args) {
+        log(level::debug, fmt, std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void info(format_string_t<Args...> fmt, Args &&...args) {
+        log(level::info, fmt, std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void warn(format_string_t<Args...> fmt, Args &&...args) {
+        log(level::warn, fmt, std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void error(format_string_t<Args...> fmt, Args &&...args) {
+        log(level::err, fmt, std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void critical(format_string_t<Args...> fmt, Args &&...args) {
+        log(level::critical, fmt, std::forward<Args>(args)...);
+    }
+
+#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
+    template <typename... Args>
+    void log(source_loc loc, level::level_enum lvl, wformat_string_t<Args...> fmt, Args &&...args) {
+        log_(loc, lvl, details::to_string_view(fmt), std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void log(level::level_enum lvl, wformat_string_t<Args...> fmt, Args &&...args) {
+        log(source_loc{}, lvl, fmt, std::forward<Args>(args)...);
+    }
+
+    void log(log_clock::time_point log_time,
+             source_loc loc,
+             level::level_enum lvl,
+             wstring_view_t msg) {
+        bool log_enabled = should_log(lvl);
+        bool traceback_enabled = tracer_.enabled();
+        if (!log_enabled && !traceback_enabled) {
+            return;
+        }
+
+        memory_buf_t buf;
+        details::os::wstr_to_utf8buf(wstring_view_t(msg.data(), msg.size()), buf);
+        details::log_msg log_msg(log_time, loc, name_, lvl, string_view_t(buf.data(), buf.size()));
+        log_it_(log_msg, log_enabled, traceback_enabled);
+    }
+
+    void log(source_loc loc, level::level_enum lvl, wstring_view_t msg) {
+        bool log_enabled = should_log(lvl);
+        bool traceback_enabled = tracer_.enabled();
+        if (!log_enabled && !traceback_enabled) {
+            return;
+        }
+
+        memory_buf_t buf;
+        details::os::wstr_to_utf8buf(wstring_view_t(msg.data(), msg.size()), buf);
+        details::log_msg log_msg(loc, name_, lvl, string_view_t(buf.data(), buf.size()));
+        log_it_(log_msg, log_enabled, traceback_enabled);
+    }
+
+    void log(level::level_enum lvl, wstring_view_t msg) { log(source_loc{}, lvl, msg); }
+
+    template <typename... Args>
+    void trace(wformat_string_t<Args...> fmt, Args &&...args) {
+        log(level::trace, fmt, std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void debug(wformat_string_t<Args...> fmt, Args &&...args) {
+        log(level::debug, fmt, std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void info(wformat_string_t<Args...> fmt, Args &&...args) {
+        log(level::info, fmt, std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void warn(wformat_string_t<Args...> fmt, Args &&...args) {
+        log(level::warn, fmt, std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void error(wformat_string_t<Args...> fmt, Args &&...args) {
+        log(level::err, fmt, std::forward<Args>(args)...);
+    }
+
+    template <typename... Args>
+    void critical(wformat_string_t<Args...> fmt, Args &&...args) {
+        log(level::critical, fmt, std::forward<Args>(args)...);
+    }
+#endif
+
+    template <typename T>
+    void trace(const T &msg) {
+        log(level::trace, msg);
+    }
+
+    template <typename T>
+    void debug(const T &msg) {
+        log(level::debug, msg);
+    }
+
+    template <typename T>
+    void info(const T &msg) {
+        log(level::info, msg);
+    }
+
+    template <typename T>
+    void warn(const T &msg) {
+        log(level::warn, msg);
+    }
+
+    template <typename T>
+    void error(const T &msg) {
+        log(level::err, msg);
+    }
+
+    template <typename T>
+    void critical(const T &msg) {
+        log(level::critical, msg);
+    }
+
+    // return true logging is enabled for the given level.
+    bool should_log(level::level_enum msg_level) const {
+        return msg_level >= level_.load(std::memory_order_relaxed);
+    }
+
+    // return true if backtrace logging is enabled.
+    bool should_backtrace() const { return tracer_.enabled(); }
+
+    void set_level(level::level_enum log_level);
+
+    level::level_enum level() const;
+
+    const std::string &name() const;
+
+    // set formatting for the sinks in this logger.
+    // each sink will get a separate instance of the formatter object.
+    void set_formatter(std::unique_ptr<formatter> f);
+
+    // set formatting for the sinks in this logger.
+    // equivalent to
+    //     set_formatter(make_unique<pattern_formatter>(pattern, time_type))
+    // Note: each sink will get a new instance of a formatter object, replacing the old one.
+    void set_pattern(std::string pattern, pattern_time_type time_type = pattern_time_type::local);
+
+    // backtrace support.
+    // efficiently store all debug/trace messages in a circular buffer until needed for debugging.
+    void enable_backtrace(size_t n_messages);
+    void disable_backtrace();
+    void dump_backtrace();
+
+    // flush functions
+    void flush();
+    void flush_on(level::level_enum log_level);
+    level::level_enum flush_level() const;
+
+    // sinks
+    const std::vector<sink_ptr> &sinks() const;
+
+    std::vector<sink_ptr> &sinks();
+
+    // error handler
+    void set_error_handler(err_handler);
+
+    // create new logger with same sinks and configuration.
+    virtual std::shared_ptr<logger> clone(std::string logger_name);
+
+protected:
+    std::string name_;
+    std::vector<sink_ptr> sinks_;
+    spdlog::level_t level_{level::info};
+    spdlog::level_t flush_level_{level::off};
+    err_handler custom_err_handler_{nullptr};
+    details::backtracer tracer_;
+
+    // common implementation for after templated public api has been resolved
+    template <typename... Args>
+    void log_(source_loc loc, level::level_enum lvl, string_view_t fmt, Args &&...args) {
+        bool log_enabled = should_log(lvl);
+        bool traceback_enabled = tracer_.enabled();
+        if (!log_enabled && !traceback_enabled) {
+            return;
+        }
+        SPDLOG_TRY {
+            memory_buf_t buf;
+#ifdef SPDLOG_USE_STD_FORMAT
+            fmt_lib::vformat_to(std::back_inserter(buf), fmt, fmt_lib::make_format_args(args...));
+#else
+            fmt::vformat_to(fmt::appender(buf), fmt, fmt::make_format_args(args...));
+#endif
+
+            details::log_msg log_msg(loc, name_, lvl, string_view_t(buf.data(), buf.size()));
+            log_it_(log_msg, log_enabled, traceback_enabled);
+        }
+        SPDLOG_LOGGER_CATCH(loc)
+    }
+
+#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
+    template <typename... Args>
+    void log_(source_loc loc, level::level_enum lvl, wstring_view_t fmt, Args &&...args) {
+        bool log_enabled = should_log(lvl);
+        bool traceback_enabled = tracer_.enabled();
+        if (!log_enabled && !traceback_enabled) {
+            return;
+        }
+        SPDLOG_TRY {
+            // format to wmemory_buffer and convert to utf8
+            wmemory_buf_t wbuf;
+            fmt_lib::vformat_to(std::back_inserter(wbuf), fmt,
+                                fmt_lib::make_format_args<fmt_lib::wformat_context>(args...));
+
+            memory_buf_t buf;
+            details::os::wstr_to_utf8buf(wstring_view_t(wbuf.data(), wbuf.size()), buf);
+            details::log_msg log_msg(loc, name_, lvl, string_view_t(buf.data(), buf.size()));
+            log_it_(log_msg, log_enabled, traceback_enabled);
+        }
+        SPDLOG_LOGGER_CATCH(loc)
+    }
+#endif  // SPDLOG_WCHAR_TO_UTF8_SUPPORT
+
+    // log the given message (if the given log level is high enough),
+    // and save backtrace (if backtrace is enabled).
+    void log_it_(const details::log_msg &log_msg, bool log_enabled, bool traceback_enabled);
+    virtual void sink_it_(const details::log_msg &msg);
+    virtual void flush_();
+    void dump_backtrace_();
+    bool should_flush_(const details::log_msg &msg);
+
+    // handle errors during logging.
+    // default handler prints the error to stderr at max rate of 1 message/sec.
+    void err_handler_(const std::string &msg);
+};
+
+void swap(logger &a, logger &b);
+
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "logger-inl.h"
+#endif

3rd/spdlog/mdc.h

@@ -0,0 +1,50 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#if defined(SPDLOG_NO_TLS)
+    #error "This header requires thread local storage support, but SPDLOG_NO_TLS is defined."
+#endif
+
+#include <map>
+#include <string>
+
+#include <spdlog/common.h>
+
+// MDC is a simple map of key->string values stored in thread local storage whose content will be printed by the loggers.
+// Note: Not supported in async mode (thread local storage - so the async thread pool have different copy).
+//
+// Usage example:
+// spdlog::mdc::put("mdc_key_1", "mdc_value_1");
+// spdlog::info("Hello, {}", "World!");  // => [2024-04-26 02:08:05.040] [info] [mdc_key_1:mdc_value_1] Hello, World!
+
+namespace spdlog {
+class SPDLOG_API mdc {
+public:
+    using mdc_map_t = std::map<std::string, std::string>;
+
+    static void put(const std::string &key, const std::string &value) {
+        get_context()[key] = value;
+    }
+
+    static std::string get(const std::string &key) {
+        auto &context = get_context();
+        auto it = context.find(key);
+        if (it != context.end()) {
+            return it->second;
+        }
+        return "";
+    }
+
+    static void remove(const std::string &key) { get_context().erase(key); }
+
+    static void clear() { get_context().clear(); }
+
+    static mdc_map_t &get_context() {
+        static thread_local mdc_map_t context;
+        return context;
+    }
+};
+
+}  // namespace spdlog

3rd/spdlog/pattern_formatter.h

@@ -0,0 +1,118 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/common.h>
+#include <spdlog/details/log_msg.h>
+#include <spdlog/details/os.h>
+#include <spdlog/formatter.h>
+
+#include <chrono>
+#include <ctime>
+#include <memory>
+
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+namespace spdlog {
+namespace details {
+
+// padding information.
+struct padding_info {
+    enum class pad_side { left, right, center };
+
+    padding_info() = default;
+    padding_info(size_t width, padding_info::pad_side side, bool truncate)
+        : width_(width),
+          side_(side),
+          truncate_(truncate),
+          enabled_(true) {}
+
+    bool enabled() const { return enabled_; }
+    size_t width_ = 0;
+    pad_side side_ = pad_side::left;
+    bool truncate_ = false;
+    bool enabled_ = false;
+};
+
+class SPDLOG_API flag_formatter {
+public:
+    explicit flag_formatter(padding_info padinfo)
+        : padinfo_(padinfo) {}
+    flag_formatter() = default;
+    virtual ~flag_formatter() = default;
+    virtual void format(const details::log_msg &msg,
+                        const std::tm &tm_time,
+                        memory_buf_t &dest) = 0;
+
+protected:
+    padding_info padinfo_;
+};
+
+}  // namespace details
+
+class SPDLOG_API custom_flag_formatter : public details::flag_formatter {
+public:
+    virtual std::unique_ptr<custom_flag_formatter> clone() const = 0;
+
+    void set_padding_info(const details::padding_info &padding) {
+        flag_formatter::padinfo_ = padding;
+    }
+};
+
+class SPDLOG_API pattern_formatter final : public formatter {
+public:
+    using custom_flags = std::unordered_map<char, std::unique_ptr<custom_flag_formatter>>;
+
+    explicit pattern_formatter(std::string pattern,
+                               pattern_time_type time_type = pattern_time_type::local,
+                               std::string eol = spdlog::details::os::default_eol,
+                               custom_flags custom_user_flags = custom_flags());
+
+    // use default pattern is not given
+    explicit pattern_formatter(pattern_time_type time_type = pattern_time_type::local,
+                               std::string eol = spdlog::details::os::default_eol);
+
+    pattern_formatter(const pattern_formatter &other) = delete;
+    pattern_formatter &operator=(const pattern_formatter &other) = delete;
+
+    std::unique_ptr<formatter> clone() const override;
+    void format(const details::log_msg &msg, memory_buf_t &dest) override;
+
+    template <typename T, typename... Args>
+    pattern_formatter &add_flag(char flag, Args &&...args) {
+        custom_handlers_[flag] = details::make_unique<T>(std::forward<Args>(args)...);
+        return *this;
+    }
+    void set_pattern(std::string pattern);
+    void need_localtime(bool need = true);
+
+private:
+    std::string pattern_;
+    std::string eol_;
+    pattern_time_type pattern_time_type_;
+    bool need_localtime_;
+    std::tm cached_tm_;
+    std::chrono::seconds last_log_secs_;
+    std::vector<std::unique_ptr<details::flag_formatter>> formatters_;
+    custom_flags custom_handlers_;
+
+    std::tm get_time_(const details::log_msg &msg);
+    template <typename Padder>
+    void handle_flag_(char flag, details::padding_info padding);
+
+    // Extract given pad spec (e.g. %8X)
+    // Advance the given it pass the end of the padding spec found (if any)
+    // Return padding.
+    static details::padding_info handle_padspec_(std::string::const_iterator &it,
+                                                 std::string::const_iterator end);
+
+    void compile_pattern_(const std::string &pattern);
+};
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "pattern_formatter-inl.h"
+#endif

3rd/spdlog/sinks/android_sink.h

@@ -0,0 +1,137 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifdef __ANDROID__
+
+    #include <spdlog/details/fmt_helper.h>
+    #include <spdlog/details/null_mutex.h>
+    #include <spdlog/details/os.h>
+    #include <spdlog/details/synchronous_factory.h>
+    #include <spdlog/sinks/base_sink.h>
+
+    #include <android/log.h>
+    #include <chrono>
+    #include <mutex>
+    #include <string>
+    #include <thread>
+    #include <type_traits>
+
+    #if !defined(SPDLOG_ANDROID_RETRIES)
+        #define SPDLOG_ANDROID_RETRIES 2
+    #endif
+
+namespace spdlog {
+namespace sinks {
+
+/*
+ * Android sink
+ * (logging using __android_log_write or __android_log_buf_write depending on the specified
+ * BufferID)
+ */
+template <typename Mutex, int BufferID = log_id::LOG_ID_MAIN>
+class android_sink final : public base_sink<Mutex> {
+public:
+    explicit android_sink(std::string tag = "spdlog", bool use_raw_msg = false)
+        : tag_(std::move(tag)),
+          use_raw_msg_(use_raw_msg) {}
+
+protected:
+    void sink_it_(const details::log_msg &msg) override {
+        const android_LogPriority priority = convert_to_android_(msg.level);
+        memory_buf_t formatted;
+        if (use_raw_msg_) {
+            details::fmt_helper::append_string_view(msg.payload, formatted);
+        } else {
+            base_sink<Mutex>::formatter_->format(msg, formatted);
+        }
+        formatted.push_back('\0');
+        const char *msg_output = formatted.data();
+
+        // See system/core/liblog/logger_write.c for explanation of return value
+        int ret = android_log(priority, tag_.c_str(), msg_output);
+        if (ret == -EPERM) {
+            return;  // !__android_log_is_loggable
+        }
+        int retry_count = 0;
+        while ((ret == -11 /*EAGAIN*/) && (retry_count < SPDLOG_ANDROID_RETRIES)) {
+            details::os::sleep_for_millis(5);
+            ret = android_log(priority, tag_.c_str(), msg_output);
+            retry_count++;
+        }
+
+        if (ret < 0) {
+            throw_spdlog_ex("logging to Android failed", ret);
+        }
+    }
+
+    void flush_() override {}
+
+private:
+    // There might be liblog versions used, that do not support __android_log_buf_write. So we only
+    // compile and link against
+    // __android_log_buf_write, if user explicitly provides a non-default log buffer. Otherwise,
+    // when using the default log buffer, always log via __android_log_write.
+    template <int ID = BufferID>
+    typename std::enable_if<ID == static_cast<int>(log_id::LOG_ID_MAIN), int>::type android_log(
+        int prio, const char *tag, const char *text) {
+        return __android_log_write(prio, tag, text);
+    }
+
+    template <int ID = BufferID>
+    typename std::enable_if<ID != static_cast<int>(log_id::LOG_ID_MAIN), int>::type android_log(
+        int prio, const char *tag, const char *text) {
+        return __android_log_buf_write(ID, prio, tag, text);
+    }
+
+    static android_LogPriority convert_to_android_(spdlog::level::level_enum level) {
+        switch (level) {
+            case spdlog::level::trace:
+                return ANDROID_LOG_VERBOSE;
+            case spdlog::level::debug:
+                return ANDROID_LOG_DEBUG;
+            case spdlog::level::info:
+                return ANDROID_LOG_INFO;
+            case spdlog::level::warn:
+                return ANDROID_LOG_WARN;
+            case spdlog::level::err:
+                return ANDROID_LOG_ERROR;
+            case spdlog::level::critical:
+                return ANDROID_LOG_FATAL;
+            default:
+                return ANDROID_LOG_DEFAULT;
+        }
+    }
+
+    std::string tag_;
+    bool use_raw_msg_;
+};
+
+using android_sink_mt = android_sink<std::mutex>;
+using android_sink_st = android_sink<details::null_mutex>;
+
+template <int BufferId = log_id::LOG_ID_MAIN>
+using android_sink_buf_mt = android_sink<std::mutex, BufferId>;
+template <int BufferId = log_id::LOG_ID_MAIN>
+using android_sink_buf_st = android_sink<details::null_mutex, BufferId>;
+
+}  // namespace sinks
+
+// Create and register android syslog logger
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> android_logger_mt(const std::string &logger_name,
+                                                 const std::string &tag = "spdlog") {
+    return Factory::template create<sinks::android_sink_mt>(logger_name, tag);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> android_logger_st(const std::string &logger_name,
+                                                 const std::string &tag = "spdlog") {
+    return Factory::template create<sinks::android_sink_st>(logger_name, tag);
+}
+
+}  // namespace spdlog
+
+#endif  // __ANDROID__

3rd/spdlog/sinks/ansicolor_sink-inl.h

@@ -0,0 +1,135 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/sinks/ansicolor_sink.h>
+#endif
+
+#include <spdlog/details/os.h>
+#include <spdlog/pattern_formatter.h>
+
+namespace spdlog {
+namespace sinks {
+
+template <typename ConsoleMutex>
+SPDLOG_INLINE ansicolor_sink<ConsoleMutex>::ansicolor_sink(FILE *target_file, color_mode mode)
+    : target_file_(target_file),
+      mutex_(ConsoleMutex::mutex()),
+      formatter_(details::make_unique<spdlog::pattern_formatter>())
+
+{
+    set_color_mode(mode);
+    colors_.at(level::trace) = to_string_(white);
+    colors_.at(level::debug) = to_string_(cyan);
+    colors_.at(level::info) = to_string_(green);
+    colors_.at(level::warn) = to_string_(yellow_bold);
+    colors_.at(level::err) = to_string_(red_bold);
+    colors_.at(level::critical) = to_string_(bold_on_red);
+    colors_.at(level::off) = to_string_(reset);
+}
+
+template <typename ConsoleMutex>
+SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::set_color(level::level_enum color_level,
+                                                           string_view_t color) {
+    std::lock_guard<mutex_t> lock(mutex_);
+    colors_.at(static_cast<size_t>(color_level)) = to_string_(color);
+}
+
+template <typename ConsoleMutex>
+SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::log(const details::log_msg &msg) {
+    // Wrap the originally formatted message in color codes.
+    // If color is not supported in the terminal, log as is instead.
+    std::lock_guard<mutex_t> lock(mutex_);
+    msg.color_range_start = 0;
+    msg.color_range_end = 0;
+    memory_buf_t formatted;
+    formatter_->format(msg, formatted);
+    if (should_do_colors_ && msg.color_range_end > msg.color_range_start) {
+        // before color range
+        print_range_(formatted, 0, msg.color_range_start);
+        // in color range
+        print_ccode_(colors_.at(static_cast<size_t>(msg.level)));
+        print_range_(formatted, msg.color_range_start, msg.color_range_end);
+        print_ccode_(reset);
+        // after color range
+        print_range_(formatted, msg.color_range_end, formatted.size());
+    } else  // no color
+    {
+        print_range_(formatted, 0, formatted.size());
+    }
+    fflush(target_file_);
+}
+
+template <typename ConsoleMutex>
+SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::flush() {
+    std::lock_guard<mutex_t> lock(mutex_);
+    fflush(target_file_);
+}
+
+template <typename ConsoleMutex>
+SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::set_pattern(const std::string &pattern) {
+    std::lock_guard<mutex_t> lock(mutex_);
+    formatter_ = std::unique_ptr<spdlog::formatter>(new pattern_formatter(pattern));
+}
+
+template <typename ConsoleMutex>
+SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::set_formatter(
+    std::unique_ptr<spdlog::formatter> sink_formatter) {
+    std::lock_guard<mutex_t> lock(mutex_);
+    formatter_ = std::move(sink_formatter);
+}
+
+template <typename ConsoleMutex>
+SPDLOG_INLINE bool ansicolor_sink<ConsoleMutex>::should_color() {
+    return should_do_colors_;
+}
+
+template <typename ConsoleMutex>
+SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::set_color_mode(color_mode mode) {
+    switch (mode) {
+        case color_mode::always:
+            should_do_colors_ = true;
+            return;
+        case color_mode::automatic:
+            should_do_colors_ =
+                details::os::in_terminal(target_file_) && details::os::is_color_terminal();
+            return;
+        case color_mode::never:
+            should_do_colors_ = false;
+            return;
+        default:
+            should_do_colors_ = false;
+    }
+}
+
+template <typename ConsoleMutex>
+SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::print_ccode_(const string_view_t &color_code) {
+    fwrite(color_code.data(), sizeof(char), color_code.size(), target_file_);
+}
+
+template <typename ConsoleMutex>
+SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::print_range_(const memory_buf_t &formatted,
+                                                              size_t start,
+                                                              size_t end) {
+    fwrite(formatted.data() + start, sizeof(char), end - start, target_file_);
+}
+
+template <typename ConsoleMutex>
+SPDLOG_INLINE std::string ansicolor_sink<ConsoleMutex>::to_string_(const string_view_t &sv) {
+    return std::string(sv.data(), sv.size());
+}
+
+// ansicolor_stdout_sink
+template <typename ConsoleMutex>
+SPDLOG_INLINE ansicolor_stdout_sink<ConsoleMutex>::ansicolor_stdout_sink(color_mode mode)
+    : ansicolor_sink<ConsoleMutex>(stdout, mode) {}
+
+// ansicolor_stderr_sink
+template <typename ConsoleMutex>
+SPDLOG_INLINE ansicolor_stderr_sink<ConsoleMutex>::ansicolor_stderr_sink(color_mode mode)
+    : ansicolor_sink<ConsoleMutex>(stderr, mode) {}
+
+}  // namespace sinks
+}  // namespace spdlog

3rd/spdlog/sinks/ansicolor_sink.h

@@ -0,0 +1,115 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <array>
+#include <memory>
+#include <mutex>
+#include <spdlog/details/console_globals.h>
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/sinks/sink.h>
+#include <string>
+
+namespace spdlog {
+namespace sinks {
+
+/**
+ * This sink prefixes the output with an ANSI escape sequence color code
+ * depending on the severity
+ * of the message.
+ * If no color terminal detected, omit the escape codes.
+ */
+
+template <typename ConsoleMutex>
+class ansicolor_sink : public sink {
+public:
+    using mutex_t = typename ConsoleMutex::mutex_t;
+    ansicolor_sink(FILE *target_file, color_mode mode);
+    ~ansicolor_sink() override = default;
+
+    ansicolor_sink(const ansicolor_sink &other) = delete;
+    ansicolor_sink(ansicolor_sink &&other) = delete;
+
+    ansicolor_sink &operator=(const ansicolor_sink &other) = delete;
+    ansicolor_sink &operator=(ansicolor_sink &&other) = delete;
+
+    void set_color(level::level_enum color_level, string_view_t color);
+    void set_color_mode(color_mode mode);
+    bool should_color();
+
+    void log(const details::log_msg &msg) override;
+    void flush() override;
+    void set_pattern(const std::string &pattern) final override;
+    void set_formatter(std::unique_ptr<spdlog::formatter> sink_formatter) override;
+
+    // Formatting codes
+    const string_view_t reset = "\033[m";
+    const string_view_t bold = "\033[1m";
+    const string_view_t dark = "\033[2m";
+    const string_view_t underline = "\033[4m";
+    const string_view_t blink = "\033[5m";
+    const string_view_t reverse = "\033[7m";
+    const string_view_t concealed = "\033[8m";
+    const string_view_t clear_line = "\033[K";
+
+    // Foreground colors
+    const string_view_t black = "\033[30m";
+    const string_view_t red = "\033[31m";
+    const string_view_t green = "\033[32m";
+    const string_view_t yellow = "\033[33m";
+    const string_view_t blue = "\033[34m";
+    const string_view_t magenta = "\033[35m";
+    const string_view_t cyan = "\033[36m";
+    const string_view_t white = "\033[37m";
+
+    /// Background colors
+    const string_view_t on_black = "\033[40m";
+    const string_view_t on_red = "\033[41m";
+    const string_view_t on_green = "\033[42m";
+    const string_view_t on_yellow = "\033[43m";
+    const string_view_t on_blue = "\033[44m";
+    const string_view_t on_magenta = "\033[45m";
+    const string_view_t on_cyan = "\033[46m";
+    const string_view_t on_white = "\033[47m";
+
+    /// Bold colors
+    const string_view_t yellow_bold = "\033[33m\033[1m";
+    const string_view_t red_bold = "\033[31m\033[1m";
+    const string_view_t bold_on_red = "\033[1m\033[41m";
+
+private:
+    FILE *target_file_;
+    mutex_t &mutex_;
+    bool should_do_colors_;
+    std::unique_ptr<spdlog::formatter> formatter_;
+    std::array<std::string, level::n_levels> colors_;
+    void print_ccode_(const string_view_t &color_code);
+    void print_range_(const memory_buf_t &formatted, size_t start, size_t end);
+    static std::string to_string_(const string_view_t &sv);
+};
+
+template <typename ConsoleMutex>
+class ansicolor_stdout_sink : public ansicolor_sink<ConsoleMutex> {
+public:
+    explicit ansicolor_stdout_sink(color_mode mode = color_mode::automatic);
+};
+
+template <typename ConsoleMutex>
+class ansicolor_stderr_sink : public ansicolor_sink<ConsoleMutex> {
+public:
+    explicit ansicolor_stderr_sink(color_mode mode = color_mode::automatic);
+};
+
+using ansicolor_stdout_sink_mt = ansicolor_stdout_sink<details::console_mutex>;
+using ansicolor_stdout_sink_st = ansicolor_stdout_sink<details::console_nullmutex>;
+
+using ansicolor_stderr_sink_mt = ansicolor_stderr_sink<details::console_mutex>;
+using ansicolor_stderr_sink_st = ansicolor_stderr_sink<details::console_nullmutex>;
+
+}  // namespace sinks
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "ansicolor_sink-inl.h"
+#endif

3rd/spdlog/sinks/base_sink-inl.h

@@ -0,0 +1,59 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/sinks/base_sink.h>
+#endif
+
+#include <spdlog/common.h>
+#include <spdlog/pattern_formatter.h>
+
+#include <memory>
+#include <mutex>
+
+template <typename Mutex>
+SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::base_sink()
+    : formatter_{details::make_unique<spdlog::pattern_formatter>()} {}
+
+template <typename Mutex>
+SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::base_sink(
+    std::unique_ptr<spdlog::formatter> formatter)
+    : formatter_{std::move(formatter)} {}
+
+template <typename Mutex>
+void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::log(const details::log_msg &msg) {
+    std::lock_guard<Mutex> lock(mutex_);
+    sink_it_(msg);
+}
+
+template <typename Mutex>
+void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::flush() {
+    std::lock_guard<Mutex> lock(mutex_);
+    flush_();
+}
+
+template <typename Mutex>
+void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::set_pattern(const std::string &pattern) {
+    std::lock_guard<Mutex> lock(mutex_);
+    set_pattern_(pattern);
+}
+
+template <typename Mutex>
+void SPDLOG_INLINE
+spdlog::sinks::base_sink<Mutex>::set_formatter(std::unique_ptr<spdlog::formatter> sink_formatter) {
+    std::lock_guard<Mutex> lock(mutex_);
+    set_formatter_(std::move(sink_formatter));
+}
+
+template <typename Mutex>
+void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::set_pattern_(const std::string &pattern) {
+    set_formatter_(details::make_unique<spdlog::pattern_formatter>(pattern));
+}
+
+template <typename Mutex>
+void SPDLOG_INLINE
+spdlog::sinks::base_sink<Mutex>::set_formatter_(std::unique_ptr<spdlog::formatter> sink_formatter) {
+    formatter_ = std::move(sink_formatter);
+}

3rd/spdlog/sinks/base_sink.h

@@ -0,0 +1,51 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+//
+// base sink templated over a mutex (either dummy or real)
+// concrete implementation should override the sink_it_() and flush_()  methods.
+// locking is taken care of in this class - no locking needed by the
+// implementers..
+//
+
+#include <spdlog/common.h>
+#include <spdlog/details/log_msg.h>
+#include <spdlog/sinks/sink.h>
+
+namespace spdlog {
+namespace sinks {
+template <typename Mutex>
+class SPDLOG_API base_sink : public sink {
+public:
+    base_sink();
+    explicit base_sink(std::unique_ptr<spdlog::formatter> formatter);
+    ~base_sink() override = default;
+
+    base_sink(const base_sink &) = delete;
+    base_sink(base_sink &&) = delete;
+
+    base_sink &operator=(const base_sink &) = delete;
+    base_sink &operator=(base_sink &&) = delete;
+
+    void log(const details::log_msg &msg) final override;
+    void flush() final override;
+    void set_pattern(const std::string &pattern) final override;
+    void set_formatter(std::unique_ptr<spdlog::formatter> sink_formatter) final override;
+
+protected:
+    // sink formatter
+    std::unique_ptr<spdlog::formatter> formatter_;
+    Mutex mutex_;
+
+    virtual void sink_it_(const details::log_msg &msg) = 0;
+    virtual void flush_() = 0;
+    virtual void set_pattern_(const std::string &pattern);
+    virtual void set_formatter_(std::unique_ptr<spdlog::formatter> sink_formatter);
+};
+}  // namespace sinks
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "base_sink-inl.h"
+#endif

3rd/spdlog/sinks/basic_file_sink-inl.h

@@ -0,0 +1,42 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/sinks/basic_file_sink.h>
+#endif
+
+#include <spdlog/common.h>
+#include <spdlog/details/os.h>
+
+namespace spdlog {
+namespace sinks {
+
+template <typename Mutex>
+SPDLOG_INLINE basic_file_sink<Mutex>::basic_file_sink(const filename_t &filename,
+                                                      bool truncate,
+                                                      const file_event_handlers &event_handlers)
+    : file_helper_{event_handlers} {
+    file_helper_.open(filename, truncate);
+}
+
+template <typename Mutex>
+SPDLOG_INLINE const filename_t &basic_file_sink<Mutex>::filename() const {
+    return file_helper_.filename();
+}
+
+template <typename Mutex>
+SPDLOG_INLINE void basic_file_sink<Mutex>::sink_it_(const details::log_msg &msg) {
+    memory_buf_t formatted;
+    base_sink<Mutex>::formatter_->format(msg, formatted);
+    file_helper_.write(formatted);
+}
+
+template <typename Mutex>
+SPDLOG_INLINE void basic_file_sink<Mutex>::flush_() {
+    file_helper_.flush();
+}
+
+}  // namespace sinks
+}  // namespace spdlog

3rd/spdlog/sinks/basic_file_sink.h

@@ -0,0 +1,65 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/file_helper.h>
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/details/synchronous_factory.h>
+#include <spdlog/sinks/base_sink.h>
+
+#include <mutex>
+#include <string>
+
+namespace spdlog {
+namespace sinks {
+/*
+ * Trivial file sink with single file as target
+ */
+template <typename Mutex>
+class basic_file_sink final : public base_sink<Mutex> {
+public:
+    explicit basic_file_sink(const filename_t &filename,
+                             bool truncate = false,
+                             const file_event_handlers &event_handlers = {});
+    const filename_t &filename() const;
+
+protected:
+    void sink_it_(const details::log_msg &msg) override;
+    void flush_() override;
+
+private:
+    details::file_helper file_helper_;
+};
+
+using basic_file_sink_mt = basic_file_sink<std::mutex>;
+using basic_file_sink_st = basic_file_sink<details::null_mutex>;
+
+}  // namespace sinks
+
+//
+// factory functions
+//
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> basic_logger_mt(const std::string &logger_name,
+                                               const filename_t &filename,
+                                               bool truncate = false,
+                                               const file_event_handlers &event_handlers = {}) {
+    return Factory::template create<sinks::basic_file_sink_mt>(logger_name, filename, truncate,
+                                                               event_handlers);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> basic_logger_st(const std::string &logger_name,
+                                               const filename_t &filename,
+                                               bool truncate = false,
+                                               const file_event_handlers &event_handlers = {}) {
+    return Factory::template create<sinks::basic_file_sink_st>(logger_name, filename, truncate,
+                                                               event_handlers);
+}
+
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "basic_file_sink-inl.h"
+#endif

3rd/spdlog/sinks/callback_sink.h

@@ -0,0 +1,56 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/details/synchronous_factory.h>
+#include <spdlog/sinks/base_sink.h>
+
+#include <mutex>
+#include <string>
+
+namespace spdlog {
+
+// callbacks type
+typedef std::function<void(const details::log_msg &msg)> custom_log_callback;
+
+namespace sinks {
+/*
+ * Trivial callback sink, gets a callback function and calls it on each log
+ */
+template <typename Mutex>
+class callback_sink final : public base_sink<Mutex> {
+public:
+    explicit callback_sink(const custom_log_callback &callback)
+        : callback_{callback} {}
+
+protected:
+    void sink_it_(const details::log_msg &msg) override { callback_(msg); }
+    void flush_() override{}
+
+private:
+    custom_log_callback callback_;
+};
+
+using callback_sink_mt = callback_sink<std::mutex>;
+using callback_sink_st = callback_sink<details::null_mutex>;
+
+}  // namespace sinks
+
+//
+// factory functions
+//
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> callback_logger_mt(const std::string &logger_name,
+                                                  const custom_log_callback &callback) {
+    return Factory::template create<sinks::callback_sink_mt>(logger_name, callback);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> callback_logger_st(const std::string &logger_name,
+                                                  const custom_log_callback &callback) {
+    return Factory::template create<sinks::callback_sink_st>(logger_name, callback);
+}
+
+}  // namespace spdlog

3rd/spdlog/sinks/daily_file_sink.h

@@ -0,0 +1,255 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/common.h>
+#include <spdlog/details/circular_q.h>
+#include <spdlog/details/file_helper.h>
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/details/os.h>
+#include <spdlog/details/synchronous_factory.h>
+#include <spdlog/fmt/chrono.h>
+#include <spdlog/fmt/fmt.h>
+#include <spdlog/sinks/base_sink.h>
+
+#include <chrono>
+#include <cstdio>
+#include <iomanip>
+#include <mutex>
+#include <sstream>
+#include <string>
+
+namespace spdlog {
+namespace sinks {
+
+/*
+ * Generator of daily log file names in format basename.YYYY-MM-DD.ext
+ */
+struct daily_filename_calculator {
+    // Create filename for the form basename.YYYY-MM-DD
+    static filename_t calc_filename(const filename_t &filename, const tm &now_tm) {
+        filename_t basename, ext;
+        std::tie(basename, ext) = details::file_helper::split_by_extension(filename);
+        return fmt_lib::format(SPDLOG_FMT_STRING(SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}{}")),
+                               basename, now_tm.tm_year + 1900, now_tm.tm_mon + 1, now_tm.tm_mday,
+                               ext);
+    }
+};
+
+/*
+ * Generator of daily log file names with strftime format.
+ * Usages:
+ *    auto sink =
+ * std::make_shared<spdlog::sinks::daily_file_format_sink_mt>("myapp-%Y-%m-%d:%H:%M:%S.log", hour,
+ * minute);" auto logger = spdlog::daily_logger_format_mt("loggername, "myapp-%Y-%m-%d:%X.log",
+ * hour,  minute)"
+ *
+ */
+struct daily_filename_format_calculator {
+    static filename_t calc_filename(const filename_t &file_path, const tm &now_tm) {
+#if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
+        std::wstringstream stream;
+#else
+        std::stringstream stream;
+#endif
+        stream << std::put_time(&now_tm, file_path.c_str());
+        return stream.str();
+    }
+};
+
+/*
+ * Rotating file sink based on date.
+ * If truncate != false , the created file will be truncated.
+ * If max_files > 0, retain only the last max_files and delete previous.
+ * If max_files > 0, retain only the last max_files and delete previous.
+ * Note that old log files from previous executions will not be deleted by this class,
+ * rotation and deletion is only applied while the program is running.
+ */
+template <typename Mutex, typename FileNameCalc = daily_filename_calculator>
+class daily_file_sink final : public base_sink<Mutex> {
+public:
+    // create daily file sink which rotates on given time
+    daily_file_sink(filename_t base_filename,
+                    int rotation_hour,
+                    int rotation_minute,
+                    bool truncate = false,
+                    uint16_t max_files = 0,
+                    const file_event_handlers &event_handlers = {})
+        : base_filename_(std::move(base_filename)),
+          rotation_h_(rotation_hour),
+          rotation_m_(rotation_minute),
+          file_helper_{event_handlers},
+          truncate_(truncate),
+          max_files_(max_files),
+          filenames_q_() {
+        if (rotation_hour < 0 || rotation_hour > 23 || rotation_minute < 0 ||
+            rotation_minute > 59) {
+            throw_spdlog_ex("daily_file_sink: Invalid rotation time in ctor");
+        }
+
+        auto now = log_clock::now();
+        auto filename = FileNameCalc::calc_filename(base_filename_, now_tm(now));
+        file_helper_.open(filename, truncate_);
+        rotation_tp_ = next_rotation_tp_();
+
+        if (max_files_ > 0) {
+            init_filenames_q_();
+        }
+    }
+
+    filename_t filename() {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        return file_helper_.filename();
+    }
+
+protected:
+    void sink_it_(const details::log_msg &msg) override {
+        auto time = msg.time;
+        bool should_rotate = time >= rotation_tp_;
+        if (should_rotate) {
+            auto filename = FileNameCalc::calc_filename(base_filename_, now_tm(time));
+            file_helper_.open(filename, truncate_);
+            rotation_tp_ = next_rotation_tp_();
+        }
+        memory_buf_t formatted;
+        base_sink<Mutex>::formatter_->format(msg, formatted);
+        file_helper_.write(formatted);
+
+        // Do the cleaning only at the end because it might throw on failure.
+        if (should_rotate && max_files_ > 0) {
+            delete_old_();
+        }
+    }
+
+    void flush_() override { file_helper_.flush(); }
+
+private:
+    void init_filenames_q_() {
+        using details::os::path_exists;
+
+        filenames_q_ = details::circular_q<filename_t>(static_cast<size_t>(max_files_));
+        std::vector<filename_t> filenames;
+        auto now = log_clock::now();
+        while (filenames.size() < max_files_) {
+            auto filename = FileNameCalc::calc_filename(base_filename_, now_tm(now));
+            if (!path_exists(filename)) {
+                break;
+            }
+            filenames.emplace_back(filename);
+            now -= std::chrono::hours(24);
+        }
+        for (auto iter = filenames.rbegin(); iter != filenames.rend(); ++iter) {
+            filenames_q_.push_back(std::move(*iter));
+        }
+    }
+
+    tm now_tm(log_clock::time_point tp) {
+        time_t tnow = log_clock::to_time_t(tp);
+        return spdlog::details::os::localtime(tnow);
+    }
+
+    log_clock::time_point next_rotation_tp_() {
+        auto now = log_clock::now();
+        tm date = now_tm(now);
+        date.tm_hour = rotation_h_;
+        date.tm_min = rotation_m_;
+        date.tm_sec = 0;
+        auto rotation_time = log_clock::from_time_t(std::mktime(&date));
+        if (rotation_time > now) {
+            return rotation_time;
+        }
+        return {rotation_time + std::chrono::hours(24)};
+    }
+
+    // Delete the file N rotations ago.
+    // Throw spdlog_ex on failure to delete the old file.
+    void delete_old_() {
+        using details::os::filename_to_str;
+        using details::os::remove_if_exists;
+
+        filename_t current_file = file_helper_.filename();
+        if (filenames_q_.full()) {
+            auto old_filename = std::move(filenames_q_.front());
+            filenames_q_.pop_front();
+            bool ok = remove_if_exists(old_filename) == 0;
+            if (!ok) {
+                filenames_q_.push_back(std::move(current_file));
+                throw_spdlog_ex("Failed removing daily file " + filename_to_str(old_filename),
+                                errno);
+            }
+        }
+        filenames_q_.push_back(std::move(current_file));
+    }
+
+    filename_t base_filename_;
+    int rotation_h_;
+    int rotation_m_;
+    log_clock::time_point rotation_tp_;
+    details::file_helper file_helper_;
+    bool truncate_;
+    uint16_t max_files_;
+    details::circular_q<filename_t> filenames_q_;
+};
+
+using daily_file_sink_mt = daily_file_sink<std::mutex>;
+using daily_file_sink_st = daily_file_sink<details::null_mutex>;
+using daily_file_format_sink_mt = daily_file_sink<std::mutex, daily_filename_format_calculator>;
+using daily_file_format_sink_st =
+    daily_file_sink<details::null_mutex, daily_filename_format_calculator>;
+
+}  // namespace sinks
+
+//
+// factory functions
+//
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> daily_logger_mt(const std::string &logger_name,
+                                               const filename_t &filename,
+                                               int hour = 0,
+                                               int minute = 0,
+                                               bool truncate = false,
+                                               uint16_t max_files = 0,
+                                               const file_event_handlers &event_handlers = {}) {
+    return Factory::template create<sinks::daily_file_sink_mt>(logger_name, filename, hour, minute,
+                                                               truncate, max_files, event_handlers);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> daily_logger_format_mt(
+    const std::string &logger_name,
+    const filename_t &filename,
+    int hour = 0,
+    int minute = 0,
+    bool truncate = false,
+    uint16_t max_files = 0,
+    const file_event_handlers &event_handlers = {}) {
+    return Factory::template create<sinks::daily_file_format_sink_mt>(
+        logger_name, filename, hour, minute, truncate, max_files, event_handlers);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> daily_logger_st(const std::string &logger_name,
+                                               const filename_t &filename,
+                                               int hour = 0,
+                                               int minute = 0,
+                                               bool truncate = false,
+                                               uint16_t max_files = 0,
+                                               const file_event_handlers &event_handlers = {}) {
+    return Factory::template create<sinks::daily_file_sink_st>(logger_name, filename, hour, minute,
+                                                               truncate, max_files, event_handlers);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> daily_logger_format_st(
+    const std::string &logger_name,
+    const filename_t &filename,
+    int hour = 0,
+    int minute = 0,
+    bool truncate = false,
+    uint16_t max_files = 0,
+    const file_event_handlers &event_handlers = {}) {
+    return Factory::template create<sinks::daily_file_format_sink_st>(
+        logger_name, filename, hour, minute, truncate, max_files, event_handlers);
+}
+}  // namespace spdlog

3rd/spdlog/sinks/dist_sink.h

@@ -0,0 +1,81 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include "base_sink.h"
+#include <spdlog/details/log_msg.h>
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/pattern_formatter.h>
+
+#include <algorithm>
+#include <memory>
+#include <mutex>
+#include <vector>
+
+// Distribution sink (mux). Stores a vector of sinks which get called when log
+// is called
+
+namespace spdlog {
+namespace sinks {
+
+template <typename Mutex>
+class dist_sink : public base_sink<Mutex> {
+public:
+    dist_sink() = default;
+    explicit dist_sink(std::vector<std::shared_ptr<sink>> sinks)
+        : sinks_(sinks) {}
+
+    dist_sink(const dist_sink &) = delete;
+    dist_sink &operator=(const dist_sink &) = delete;
+
+    void add_sink(std::shared_ptr<sink> sub_sink) {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        sinks_.push_back(sub_sink);
+    }
+
+    void remove_sink(std::shared_ptr<sink> sub_sink) {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        sinks_.erase(std::remove(sinks_.begin(), sinks_.end(), sub_sink), sinks_.end());
+    }
+
+    void set_sinks(std::vector<std::shared_ptr<sink>> sinks) {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        sinks_ = std::move(sinks);
+    }
+
+    std::vector<std::shared_ptr<sink>> &sinks() { return sinks_; }
+
+protected:
+    void sink_it_(const details::log_msg &msg) override {
+        for (auto &sub_sink : sinks_) {
+            if (sub_sink->should_log(msg.level)) {
+                sub_sink->log(msg);
+            }
+        }
+    }
+
+    void flush_() override {
+        for (auto &sub_sink : sinks_) {
+            sub_sink->flush();
+        }
+    }
+
+    void set_pattern_(const std::string &pattern) override {
+        set_formatter_(details::make_unique<spdlog::pattern_formatter>(pattern));
+    }
+
+    void set_formatter_(std::unique_ptr<spdlog::formatter> sink_formatter) override {
+        base_sink<Mutex>::formatter_ = std::move(sink_formatter);
+        for (auto &sub_sink : sinks_) {
+            sub_sink->set_formatter(base_sink<Mutex>::formatter_->clone());
+        }
+    }
+    std::vector<std::shared_ptr<sink>> sinks_;
+};
+
+using dist_sink_mt = dist_sink<std::mutex>;
+using dist_sink_st = dist_sink<details::null_mutex>;
+
+}  // namespace sinks
+}  // namespace spdlog

3rd/spdlog/sinks/dup_filter_sink.h

@@ -0,0 +1,92 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include "dist_sink.h"
+#include <spdlog/details/log_msg.h>
+#include <spdlog/details/null_mutex.h>
+
+#include <chrono>
+#include <cstdio>
+#include <mutex>
+#include <string>
+
+// Duplicate message removal sink.
+// Skip the message if previous one is identical and less than "max_skip_duration" have passed
+//
+// Example:
+//
+//     #include <spdlog/sinks/dup_filter_sink.h>
+//
+//     int main() {
+//         auto dup_filter = std::make_shared<dup_filter_sink_st>(std::chrono::seconds(5),
+//         level::info); dup_filter->add_sink(std::make_shared<stdout_color_sink_mt>());
+//         spdlog::logger l("logger", dup_filter);
+//         l.info("Hello");
+//         l.info("Hello");
+//         l.info("Hello");
+//         l.info("Different Hello");
+//     }
+//
+// Will produce:
+//       [2019-06-25 17:50:56.511] [logger] [info] Hello
+//       [2019-06-25 17:50:56.512] [logger] [info] Skipped 3 duplicate messages..
+//       [2019-06-25 17:50:56.512] [logger] [info] Different Hello
+
+namespace spdlog {
+namespace sinks {
+template <typename Mutex>
+class dup_filter_sink : public dist_sink<Mutex> {
+public:
+    template <class Rep, class Period>
+    explicit dup_filter_sink(std::chrono::duration<Rep, Period> max_skip_duration,
+                             level::level_enum notification_level = level::info)
+        : max_skip_duration_{max_skip_duration},
+          log_level_{notification_level} {}
+
+protected:
+    std::chrono::microseconds max_skip_duration_;
+    log_clock::time_point last_msg_time_;
+    std::string last_msg_payload_;
+    size_t skip_counter_ = 0;
+    level::level_enum log_level_;
+
+    void sink_it_(const details::log_msg &msg) override {
+        bool filtered = filter_(msg);
+        if (!filtered) {
+            skip_counter_ += 1;
+            return;
+        }
+
+        // log the "skipped.." message
+        if (skip_counter_ > 0) {
+            char buf[64];
+            auto msg_size = ::snprintf(buf, sizeof(buf), "Skipped %u duplicate messages..",
+                                       static_cast<unsigned>(skip_counter_));
+            if (msg_size > 0 && static_cast<size_t>(msg_size) < sizeof(buf)) {
+                details::log_msg skipped_msg{msg.source, msg.logger_name, log_level_,
+                                             string_view_t{buf, static_cast<size_t>(msg_size)}};
+                dist_sink<Mutex>::sink_it_(skipped_msg);
+            }
+        }
+
+        // log current message
+        dist_sink<Mutex>::sink_it_(msg);
+        last_msg_time_ = msg.time;
+        skip_counter_ = 0;
+        last_msg_payload_.assign(msg.payload.data(), msg.payload.data() + msg.payload.size());
+    }
+
+    // return whether the log msg should be displayed (true) or skipped (false)
+    bool filter_(const details::log_msg &msg) {
+        auto filter_duration = msg.time - last_msg_time_;
+        return (filter_duration > max_skip_duration_) || (msg.payload != last_msg_payload_);
+    }
+};
+
+using dup_filter_sink_mt = dup_filter_sink<std::mutex>;
+using dup_filter_sink_st = dup_filter_sink<details::null_mutex>;
+
+}  // namespace sinks
+}  // namespace spdlog

3rd/spdlog/sinks/hourly_file_sink.h

@@ -0,0 +1,193 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/common.h>
+#include <spdlog/details/circular_q.h>
+#include <spdlog/details/file_helper.h>
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/details/os.h>
+#include <spdlog/details/synchronous_factory.h>
+#include <spdlog/fmt/fmt.h>
+#include <spdlog/sinks/base_sink.h>
+
+#include <chrono>
+#include <cstdio>
+#include <ctime>
+#include <mutex>
+#include <string>
+
+namespace spdlog {
+namespace sinks {
+
+/*
+ * Generator of Hourly log file names in format basename.YYYY-MM-DD-HH.ext
+ */
+struct hourly_filename_calculator {
+    // Create filename for the form basename.YYYY-MM-DD-H
+    static filename_t calc_filename(const filename_t &filename, const tm &now_tm) {
+        filename_t basename, ext;
+        std::tie(basename, ext) = details::file_helper::split_by_extension(filename);
+        return fmt_lib::format(SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}_{:02d}{}"), basename,
+                               now_tm.tm_year + 1900, now_tm.tm_mon + 1, now_tm.tm_mday,
+                               now_tm.tm_hour, ext);
+    }
+};
+
+/*
+ * Rotating file sink based on time.
+ * If truncate != false , the created file will be truncated.
+ * If max_files > 0, retain only the last max_files and delete previous.
+ * Note that old log files from previous executions will not be deleted by this class,
+ * rotation and deletion is only applied while the program is running.
+ */
+template <typename Mutex, typename FileNameCalc = hourly_filename_calculator>
+class hourly_file_sink final : public base_sink<Mutex> {
+public:
+    // create hourly file sink which rotates on given time
+    hourly_file_sink(filename_t base_filename,
+                     bool truncate = false,
+                     uint16_t max_files = 0,
+                     const file_event_handlers &event_handlers = {})
+        : base_filename_(std::move(base_filename)),
+          file_helper_{event_handlers},
+          truncate_(truncate),
+          max_files_(max_files),
+          filenames_q_() {
+        auto now = log_clock::now();
+        auto filename = FileNameCalc::calc_filename(base_filename_, now_tm(now));
+        file_helper_.open(filename, truncate_);
+        remove_init_file_ = file_helper_.size() == 0;
+        rotation_tp_ = next_rotation_tp_();
+
+        if (max_files_ > 0) {
+            init_filenames_q_();
+        }
+    }
+
+    filename_t filename() {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        return file_helper_.filename();
+    }
+
+protected:
+    void sink_it_(const details::log_msg &msg) override {
+        auto time = msg.time;
+        bool should_rotate = time >= rotation_tp_;
+        if (should_rotate) {
+            if (remove_init_file_) {
+                file_helper_.close();
+                details::os::remove(file_helper_.filename());
+            }
+            auto filename = FileNameCalc::calc_filename(base_filename_, now_tm(time));
+            file_helper_.open(filename, truncate_);
+            rotation_tp_ = next_rotation_tp_();
+        }
+        remove_init_file_ = false;
+        memory_buf_t formatted;
+        base_sink<Mutex>::formatter_->format(msg, formatted);
+        file_helper_.write(formatted);
+
+        // Do the cleaning only at the end because it might throw on failure.
+        if (should_rotate && max_files_ > 0) {
+            delete_old_();
+        }
+    }
+
+    void flush_() override { file_helper_.flush(); }
+
+private:
+    void init_filenames_q_() {
+        using details::os::path_exists;
+
+        filenames_q_ = details::circular_q<filename_t>(static_cast<size_t>(max_files_));
+        std::vector<filename_t> filenames;
+        auto now = log_clock::now();
+        while (filenames.size() < max_files_) {
+            auto filename = FileNameCalc::calc_filename(base_filename_, now_tm(now));
+            if (!path_exists(filename)) {
+                break;
+            }
+            filenames.emplace_back(filename);
+            now -= std::chrono::hours(1);
+        }
+        for (auto iter = filenames.rbegin(); iter != filenames.rend(); ++iter) {
+            filenames_q_.push_back(std::move(*iter));
+        }
+    }
+
+    tm now_tm(log_clock::time_point tp) {
+        time_t tnow = log_clock::to_time_t(tp);
+        return spdlog::details::os::localtime(tnow);
+    }
+
+    log_clock::time_point next_rotation_tp_() {
+        auto now = log_clock::now();
+        tm date = now_tm(now);
+        date.tm_min = 0;
+        date.tm_sec = 0;
+        auto rotation_time = log_clock::from_time_t(std::mktime(&date));
+        if (rotation_time > now) {
+            return rotation_time;
+        }
+        return {rotation_time + std::chrono::hours(1)};
+    }
+
+    // Delete the file N rotations ago.
+    // Throw spdlog_ex on failure to delete the old file.
+    void delete_old_() {
+        using details::os::filename_to_str;
+        using details::os::remove_if_exists;
+
+        filename_t current_file = file_helper_.filename();
+        if (filenames_q_.full()) {
+            auto old_filename = std::move(filenames_q_.front());
+            filenames_q_.pop_front();
+            bool ok = remove_if_exists(old_filename) == 0;
+            if (!ok) {
+                filenames_q_.push_back(std::move(current_file));
+                SPDLOG_THROW(spdlog_ex(
+                    "Failed removing hourly file " + filename_to_str(old_filename), errno));
+            }
+        }
+        filenames_q_.push_back(std::move(current_file));
+    }
+
+    filename_t base_filename_;
+    log_clock::time_point rotation_tp_;
+    details::file_helper file_helper_;
+    bool truncate_;
+    uint16_t max_files_;
+    details::circular_q<filename_t> filenames_q_;
+    bool remove_init_file_;
+};
+
+using hourly_file_sink_mt = hourly_file_sink<std::mutex>;
+using hourly_file_sink_st = hourly_file_sink<details::null_mutex>;
+
+}  // namespace sinks
+
+//
+// factory functions
+//
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> hourly_logger_mt(const std::string &logger_name,
+                                                const filename_t &filename,
+                                                bool truncate = false,
+                                                uint16_t max_files = 0,
+                                                const file_event_handlers &event_handlers = {}) {
+    return Factory::template create<sinks::hourly_file_sink_mt>(logger_name, filename, truncate,
+                                                                max_files, event_handlers);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> hourly_logger_st(const std::string &logger_name,
+                                                const filename_t &filename,
+                                                bool truncate = false,
+                                                uint16_t max_files = 0,
+                                                const file_event_handlers &event_handlers = {}) {
+    return Factory::template create<sinks::hourly_file_sink_st>(logger_name, filename, truncate,
+                                                                max_files, event_handlers);
+}
+}  // namespace spdlog

3rd/spdlog/sinks/kafka_sink.h

@@ -0,0 +1,119 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+//
+// Custom sink for kafka
+// Building and using requires librdkafka library.
+// For building librdkafka library check the url below
+// https://github.com/confluentinc/librdkafka
+//
+
+#include "spdlog/async.h"
+#include "spdlog/details/log_msg.h"
+#include "spdlog/details/null_mutex.h"
+#include "spdlog/details/synchronous_factory.h"
+#include "spdlog/sinks/base_sink.h"
+#include <mutex>
+#include <spdlog/common.h>
+
+// kafka header
+#include <librdkafka/rdkafkacpp.h>
+
+namespace spdlog {
+namespace sinks {
+
+struct kafka_sink_config {
+    std::string server_addr;
+    std::string produce_topic;
+    int32_t flush_timeout_ms = 1000;
+
+    kafka_sink_config(std::string addr, std::string topic, int flush_timeout_ms = 1000)
+        : server_addr{std::move(addr)},
+          produce_topic{std::move(topic)},
+          flush_timeout_ms(flush_timeout_ms) {}
+};
+
+template <typename Mutex>
+class kafka_sink : public base_sink<Mutex> {
+public:
+    kafka_sink(kafka_sink_config config)
+        : config_{std::move(config)} {
+        try {
+            std::string errstr;
+            conf_.reset(RdKafka::Conf::create(RdKafka::Conf::CONF_GLOBAL));
+            RdKafka::Conf::ConfResult confRes =
+                conf_->set("bootstrap.servers", config_.server_addr, errstr);
+            if (confRes != RdKafka::Conf::CONF_OK) {
+                throw_spdlog_ex(
+                    fmt_lib::format("conf set bootstrap.servers failed err:{}", errstr));
+            }
+
+            tconf_.reset(RdKafka::Conf::create(RdKafka::Conf::CONF_TOPIC));
+            if (tconf_ == nullptr) {
+                throw_spdlog_ex(fmt_lib::format("create topic config failed"));
+            }
+
+            producer_.reset(RdKafka::Producer::create(conf_.get(), errstr));
+            if (producer_ == nullptr) {
+                throw_spdlog_ex(fmt_lib::format("create producer failed err:{}", errstr));
+            }
+            topic_.reset(RdKafka::Topic::create(producer_.get(), config_.produce_topic,
+                                                tconf_.get(), errstr));
+            if (topic_ == nullptr) {
+                throw_spdlog_ex(fmt_lib::format("create topic failed err:{}", errstr));
+            }
+        } catch (const std::exception &e) {
+            throw_spdlog_ex(fmt_lib::format("error create kafka instance: {}", e.what()));
+        }
+    }
+
+    ~kafka_sink() { producer_->flush(config_.flush_timeout_ms); }
+
+protected:
+    void sink_it_(const details::log_msg &msg) override {
+        producer_->produce(topic_.get(), 0, RdKafka::Producer::RK_MSG_COPY,
+                           (void *)msg.payload.data(), msg.payload.size(), NULL, NULL);
+    }
+
+    void flush_() override { producer_->flush(config_.flush_timeout_ms); }
+
+private:
+    kafka_sink_config config_;
+    std::unique_ptr<RdKafka::Producer> producer_ = nullptr;
+    std::unique_ptr<RdKafka::Conf> conf_ = nullptr;
+    std::unique_ptr<RdKafka::Conf> tconf_ = nullptr;
+    std::unique_ptr<RdKafka::Topic> topic_ = nullptr;
+};
+
+using kafka_sink_mt = kafka_sink<std::mutex>;
+using kafka_sink_st = kafka_sink<spdlog::details::null_mutex>;
+
+}  // namespace sinks
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> kafka_logger_mt(const std::string &logger_name,
+                                               spdlog::sinks::kafka_sink_config config) {
+    return Factory::template create<sinks::kafka_sink_mt>(logger_name, config);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> kafka_logger_st(const std::string &logger_name,
+                                               spdlog::sinks::kafka_sink_config config) {
+    return Factory::template create<sinks::kafka_sink_st>(logger_name, config);
+}
+
+template <typename Factory = spdlog::async_factory>
+inline std::shared_ptr<spdlog::logger> kafka_logger_async_mt(
+    std::string logger_name, spdlog::sinks::kafka_sink_config config) {
+    return Factory::template create<sinks::kafka_sink_mt>(logger_name, config);
+}
+
+template <typename Factory = spdlog::async_factory>
+inline std::shared_ptr<spdlog::logger> kafka_logger_async_st(
+    std::string logger_name, spdlog::sinks::kafka_sink_config config) {
+    return Factory::template create<sinks::kafka_sink_st>(logger_name, config);
+}
+
+}  // namespace spdlog

3rd/spdlog/sinks/mongo_sink.h

@@ -0,0 +1,108 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+//
+// Custom sink for mongodb
+// Building and using requires mongocxx library.
+// For building mongocxx library check the url below
+// http://mongocxx.org/mongocxx-v3/installation/
+//
+
+#include "spdlog/common.h"
+#include "spdlog/details/log_msg.h"
+#include "spdlog/sinks/base_sink.h"
+#include <spdlog/details/synchronous_factory.h>
+
+#include <bsoncxx/builder/stream/document.hpp>
+#include <bsoncxx/types.hpp>
+#include <bsoncxx/view_or_value.hpp>
+
+#include <mongocxx/client.hpp>
+#include <mongocxx/instance.hpp>
+#include <mongocxx/uri.hpp>
+
+namespace spdlog {
+namespace sinks {
+template <typename Mutex>
+class mongo_sink : public base_sink<Mutex> {
+public:
+    mongo_sink(const std::string &db_name,
+               const std::string &collection_name,
+               const std::string &uri = "mongodb://localhost:27017") try
+        : mongo_sink(std::make_shared<mongocxx::instance>(), db_name, collection_name, uri) {
+    } catch (const std::exception &e) {
+        throw_spdlog_ex(fmt_lib::format("Error opening database: {}", e.what()));
+    }
+
+    mongo_sink(std::shared_ptr<mongocxx::instance> instance,
+               const std::string &db_name,
+               const std::string &collection_name,
+               const std::string &uri = "mongodb://localhost:27017")
+        : instance_(std::move(instance)),
+          db_name_(db_name),
+          coll_name_(collection_name) {
+        try {
+            client_ = spdlog::details::make_unique<mongocxx::client>(mongocxx::uri{uri});
+        } catch (const std::exception &e) {
+            throw_spdlog_ex(fmt_lib::format("Error opening database: {}", e.what()));
+        }
+    }
+
+    ~mongo_sink() { flush_(); }
+
+protected:
+    void sink_it_(const details::log_msg &msg) override {
+        using bsoncxx::builder::stream::document;
+        using bsoncxx::builder::stream::finalize;
+
+        if (client_ != nullptr) {
+            auto doc = document{} << "timestamp" << bsoncxx::types::b_date(msg.time) << "level"
+                                  << level::to_string_view(msg.level).data() << "level_num"
+                                  << msg.level << "message"
+                                  << std::string(msg.payload.begin(), msg.payload.end())
+                                  << "logger_name"
+                                  << std::string(msg.logger_name.begin(), msg.logger_name.end())
+                                  << "thread_id" << static_cast<int>(msg.thread_id) << finalize;
+            client_->database(db_name_).collection(coll_name_).insert_one(doc.view());
+        }
+    }
+
+    void flush_() override {}
+
+private:
+    std::shared_ptr<mongocxx::instance> instance_;
+    std::string db_name_;
+    std::string coll_name_;
+    std::unique_ptr<mongocxx::client> client_ = nullptr;
+};
+
+#include "spdlog/details/null_mutex.h"
+#include <mutex>
+using mongo_sink_mt = mongo_sink<std::mutex>;
+using mongo_sink_st = mongo_sink<spdlog::details::null_mutex>;
+
+}  // namespace sinks
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> mongo_logger_mt(
+    const std::string &logger_name,
+    const std::string &db_name,
+    const std::string &collection_name,
+    const std::string &uri = "mongodb://localhost:27017") {
+    return Factory::template create<sinks::mongo_sink_mt>(logger_name, db_name, collection_name,
+                                                          uri);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> mongo_logger_st(
+    const std::string &logger_name,
+    const std::string &db_name,
+    const std::string &collection_name,
+    const std::string &uri = "mongodb://localhost:27017") {
+    return Factory::template create<sinks::mongo_sink_st>(logger_name, db_name, collection_name,
+                                                          uri);
+}
+
+}  // namespace spdlog

3rd/spdlog/sinks/msvc_sink.h

@@ -0,0 +1,68 @@
+// Copyright(c) 2016 Alexander Dalshov & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#if defined(_WIN32)
+
+    #include <spdlog/details/null_mutex.h>
+    #if defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
+        #include <spdlog/details/os.h>
+    #endif
+    #include <spdlog/sinks/base_sink.h>
+
+    #include <mutex>
+    #include <string>
+
+    // Avoid including windows.h (https://stackoverflow.com/a/30741042)
+    #if defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
+extern "C" __declspec(dllimport) void __stdcall OutputDebugStringW(const wchar_t *lpOutputString);
+    #else
+extern "C" __declspec(dllimport) void __stdcall OutputDebugStringA(const char *lpOutputString);
+    #endif
+extern "C" __declspec(dllimport) int __stdcall IsDebuggerPresent();
+
+namespace spdlog {
+namespace sinks {
+/*
+ * MSVC sink (logging using OutputDebugStringA)
+ */
+template <typename Mutex>
+class msvc_sink : public base_sink<Mutex> {
+public:
+    msvc_sink() = default;
+    msvc_sink(bool check_debugger_present)
+        : check_debugger_present_{check_debugger_present} {}
+
+protected:
+    void sink_it_(const details::log_msg &msg) override {
+        if (check_debugger_present_ && !IsDebuggerPresent()) {
+            return;
+        }
+        memory_buf_t formatted;
+        base_sink<Mutex>::formatter_->format(msg, formatted);
+        formatted.push_back('\0');  // add a null terminator for OutputDebugString
+    #if defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
+        wmemory_buf_t wformatted;
+        details::os::utf8_to_wstrbuf(string_view_t(formatted.data(), formatted.size()), wformatted);
+        OutputDebugStringW(wformatted.data());
+    #else
+        OutputDebugStringA(formatted.data());
+    #endif
+    }
+
+    void flush_() override {}
+
+    bool check_debugger_present_ = true;
+};
+
+using msvc_sink_mt = msvc_sink<std::mutex>;
+using msvc_sink_st = msvc_sink<details::null_mutex>;
+
+using windebug_sink_mt = msvc_sink_mt;
+using windebug_sink_st = msvc_sink_st;
+
+}  // namespace sinks
+}  // namespace spdlog
+
+#endif

3rd/spdlog/sinks/null_sink.h

@@ -0,0 +1,41 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/details/synchronous_factory.h>
+#include <spdlog/sinks/base_sink.h>
+
+#include <mutex>
+
+namespace spdlog {
+namespace sinks {
+
+template <typename Mutex>
+class null_sink : public base_sink<Mutex> {
+protected:
+    void sink_it_(const details::log_msg &) override {}
+    void flush_() override {}
+};
+
+using null_sink_mt = null_sink<details::null_mutex>;
+using null_sink_st = null_sink<details::null_mutex>;
+
+}  // namespace sinks
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> null_logger_mt(const std::string &logger_name) {
+    auto null_logger = Factory::template create<sinks::null_sink_mt>(logger_name);
+    null_logger->set_level(level::off);
+    return null_logger;
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> null_logger_st(const std::string &logger_name) {
+    auto null_logger = Factory::template create<sinks::null_sink_st>(logger_name);
+    null_logger->set_level(level::off);
+    return null_logger;
+}
+
+}  // namespace spdlog

3rd/spdlog/sinks/ostream_sink.h

@@ -0,0 +1,43 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/sinks/base_sink.h>
+
+#include <mutex>
+#include <ostream>
+
+namespace spdlog {
+namespace sinks {
+template <typename Mutex>
+class ostream_sink final : public base_sink<Mutex> {
+public:
+    explicit ostream_sink(std::ostream &os, bool force_flush = false)
+        : ostream_(os),
+          force_flush_(force_flush) {}
+    ostream_sink(const ostream_sink &) = delete;
+    ostream_sink &operator=(const ostream_sink &) = delete;
+
+protected:
+    void sink_it_(const details::log_msg &msg) override {
+        memory_buf_t formatted;
+        base_sink<Mutex>::formatter_->format(msg, formatted);
+        ostream_.write(formatted.data(), static_cast<std::streamsize>(formatted.size()));
+        if (force_flush_) {
+            ostream_.flush();
+        }
+    }
+
+    void flush_() override { ostream_.flush(); }
+
+    std::ostream &ostream_;
+    bool force_flush_;
+};
+
+using ostream_sink_mt = ostream_sink<std::mutex>;
+using ostream_sink_st = ostream_sink<details::null_mutex>;
+
+}  // namespace sinks
+}  // namespace spdlog

3rd/spdlog/sinks/qt_sinks.h

@@ -0,0 +1,304 @@
+// Copyright(c) 2015-present, Gabi Melman, mguludag and spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+//
+// Custom sink for QPlainTextEdit or QTextEdit and its children (QTextBrowser...
+// etc) Building and using requires Qt library.
+//
+// Warning: the qt_sink won't be notified if the target widget is destroyed.
+// If the widget's lifetime can be shorter than the logger's one, you should provide some permanent
+// QObject, and then use a standard signal/slot.
+//
+
+#include "spdlog/common.h"
+#include "spdlog/details/log_msg.h"
+#include "spdlog/details/synchronous_factory.h"
+#include "spdlog/sinks/base_sink.h"
+#include <array>
+
+#include <QPlainTextEdit>
+#include <QTextEdit>
+
+//
+// qt_sink class
+//
+namespace spdlog {
+namespace sinks {
+template <typename Mutex>
+class qt_sink : public base_sink<Mutex> {
+public:
+    qt_sink(QObject *qt_object, std::string meta_method)
+        : qt_object_(qt_object),
+          meta_method_(std::move(meta_method)) {
+        if (!qt_object_) {
+            throw_spdlog_ex("qt_sink: qt_object is null");
+        }
+    }
+
+    ~qt_sink() { flush_(); }
+
+protected:
+    void sink_it_(const details::log_msg &msg) override {
+        memory_buf_t formatted;
+        base_sink<Mutex>::formatter_->format(msg, formatted);
+        const string_view_t str = string_view_t(formatted.data(), formatted.size());
+        QMetaObject::invokeMethod(
+            qt_object_, meta_method_.c_str(), Qt::AutoConnection,
+            Q_ARG(QString, QString::fromUtf8(str.data(), static_cast<int>(str.size())).trimmed()));
+    }
+
+    void flush_() override {}
+
+private:
+    QObject *qt_object_ = nullptr;
+    std::string meta_method_;
+};
+
+// Qt color sink to QTextEdit.
+// Color location is determined by the sink log pattern like in the rest of spdlog sinks.
+// Colors can be modified if needed using sink->set_color(level, qtTextCharFormat).
+// max_lines is the maximum number of lines that the sink will hold before removing the oldest
+// lines. By default, only ascii (latin1) is supported by this sink. Set is_utf8 to true if utf8
+// support is needed.
+template <typename Mutex>
+class qt_color_sink : public base_sink<Mutex> {
+public:
+    qt_color_sink(QTextEdit *qt_text_edit,
+                  int max_lines,
+                  bool dark_colors = false,
+                  bool is_utf8 = false)
+        : qt_text_edit_(qt_text_edit),
+          max_lines_(max_lines),
+          is_utf8_(is_utf8) {
+        if (!qt_text_edit_) {
+            throw_spdlog_ex("qt_color_text_sink: text_edit is null");
+        }
+
+        default_color_ = qt_text_edit_->currentCharFormat();
+        // set colors
+        QTextCharFormat format;
+        // trace
+        format.setForeground(dark_colors ? Qt::darkGray : Qt::gray);
+        colors_.at(level::trace) = format;
+        // debug
+        format.setForeground(dark_colors ? Qt::darkCyan : Qt::cyan);
+        colors_.at(level::debug) = format;
+        // info
+        format.setForeground(dark_colors ? Qt::darkGreen : Qt::green);
+        colors_.at(level::info) = format;
+        // warn
+        format.setForeground(dark_colors ? Qt::darkYellow : Qt::yellow);
+        colors_.at(level::warn) = format;
+        // err
+        format.setForeground(Qt::red);
+        colors_.at(level::err) = format;
+        // critical
+        format.setForeground(Qt::white);
+        format.setBackground(Qt::red);
+        colors_.at(level::critical) = format;
+    }
+
+    ~qt_color_sink() { flush_(); }
+
+    void set_default_color(QTextCharFormat format) {
+        // std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        default_color_ = format;
+    }
+
+    void set_level_color(level::level_enum color_level, QTextCharFormat format) {
+        // std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        colors_.at(static_cast<size_t>(color_level)) = format;
+    }
+
+    QTextCharFormat &get_level_color(level::level_enum color_level) {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        return colors_.at(static_cast<size_t>(color_level));
+    }
+
+    QTextCharFormat &get_default_color() {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        return default_color_;
+    }
+
+protected:
+    struct invoke_params {
+        invoke_params(int max_lines,
+                      QTextEdit *q_text_edit,
+                      QString payload,
+                      QTextCharFormat default_color,
+                      QTextCharFormat level_color,
+                      int color_range_start,
+                      int color_range_end)
+            : max_lines(max_lines),
+              q_text_edit(q_text_edit),
+              payload(std::move(payload)),
+              default_color(default_color),
+              level_color(level_color),
+              color_range_start(color_range_start),
+              color_range_end(color_range_end) {}
+        int max_lines;
+        QTextEdit *q_text_edit;
+        QString payload;
+        QTextCharFormat default_color;
+        QTextCharFormat level_color;
+        int color_range_start;
+        int color_range_end;
+    };
+
+    void sink_it_(const details::log_msg &msg) override {
+        memory_buf_t formatted;
+        base_sink<Mutex>::formatter_->format(msg, formatted);
+
+        const string_view_t str = string_view_t(formatted.data(), formatted.size());
+        // apply the color to the color range in the formatted message.
+        QString payload;
+        int color_range_start = static_cast<int>(msg.color_range_start);
+        int color_range_end = static_cast<int>(msg.color_range_end);
+        if (is_utf8_) {
+            payload = QString::fromUtf8(str.data(), static_cast<int>(str.size()));
+            // convert color ranges from byte index to character index.
+            if (msg.color_range_start < msg.color_range_end) {
+                color_range_start = QString::fromUtf8(str.data(), msg.color_range_start).size();
+                color_range_end = QString::fromUtf8(str.data(), msg.color_range_end).size();
+            }
+        } else {
+            payload = QString::fromLatin1(str.data(), static_cast<int>(str.size()));
+        }
+
+        invoke_params params{max_lines_,             // max lines
+                             qt_text_edit_,          // text edit to append to
+                             std::move(payload),     // text to append
+                             default_color_,         // default color
+                             colors_.at(msg.level),  // color to apply
+                             color_range_start,      // color range start
+                             color_range_end};       // color range end
+
+        QMetaObject::invokeMethod(
+            qt_text_edit_, [params]() { invoke_method_(params); }, Qt::AutoConnection);
+    }
+
+    void flush_() override {}
+
+    // Add colored text to the text edit widget. This method is invoked in the GUI thread.
+    // It is a static method to ensure that it is handled correctly even if the sink is destroyed
+    // prematurely before it is invoked.
+
+    static void invoke_method_(invoke_params params) {
+        auto *document = params.q_text_edit->document();
+        QTextCursor cursor(document);
+
+        // remove first blocks if number of blocks exceeds max_lines
+        while (document->blockCount() > params.max_lines) {
+            cursor.select(QTextCursor::BlockUnderCursor);
+            cursor.removeSelectedText();
+            cursor.deleteChar();  // delete the newline after the block
+        }
+
+        cursor.movePosition(QTextCursor::End);
+        cursor.setCharFormat(params.default_color);
+
+        // if color range not specified or not not valid, just append the text with default color
+        if (params.color_range_end <= params.color_range_start) {
+            cursor.insertText(params.payload);
+            return;
+        }
+
+        // insert the text before the color range
+        cursor.insertText(params.payload.left(params.color_range_start));
+
+        // insert the colorized text
+        cursor.setCharFormat(params.level_color);
+        cursor.insertText(params.payload.mid(params.color_range_start,
+                                             params.color_range_end - params.color_range_start));
+
+        // insert the text after the color range with default format
+        cursor.setCharFormat(params.default_color);
+        cursor.insertText(params.payload.mid(params.color_range_end));
+    }
+
+    QTextEdit *qt_text_edit_;
+    int max_lines_;
+    bool is_utf8_;
+    QTextCharFormat default_color_;
+    std::array<QTextCharFormat, level::n_levels> colors_;
+};
+
+#include "spdlog/details/null_mutex.h"
+#include <mutex>
+
+using qt_sink_mt = qt_sink<std::mutex>;
+using qt_sink_st = qt_sink<details::null_mutex>;
+using qt_color_sink_mt = qt_color_sink<std::mutex>;
+using qt_color_sink_st = qt_color_sink<details::null_mutex>;
+}  // namespace sinks
+
+//
+// Factory functions
+//
+
+// log to QTextEdit
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> qt_logger_mt(const std::string &logger_name,
+                                            QTextEdit *qt_object,
+                                            const std::string &meta_method = "append") {
+    return Factory::template create<sinks::qt_sink_mt>(logger_name, qt_object, meta_method);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> qt_logger_st(const std::string &logger_name,
+                                            QTextEdit *qt_object,
+                                            const std::string &meta_method = "append") {
+    return Factory::template create<sinks::qt_sink_st>(logger_name, qt_object, meta_method);
+}
+
+// log to QPlainTextEdit
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> qt_logger_mt(const std::string &logger_name,
+                                            QPlainTextEdit *qt_object,
+                                            const std::string &meta_method = "appendPlainText") {
+    return Factory::template create<sinks::qt_sink_mt>(logger_name, qt_object, meta_method);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> qt_logger_st(const std::string &logger_name,
+                                            QPlainTextEdit *qt_object,
+                                            const std::string &meta_method = "appendPlainText") {
+    return Factory::template create<sinks::qt_sink_st>(logger_name, qt_object, meta_method);
+}
+// log to QObject
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> qt_logger_mt(const std::string &logger_name,
+                                            QObject *qt_object,
+                                            const std::string &meta_method) {
+    return Factory::template create<sinks::qt_sink_mt>(logger_name, qt_object, meta_method);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> qt_logger_st(const std::string &logger_name,
+                                            QObject *qt_object,
+                                            const std::string &meta_method) {
+    return Factory::template create<sinks::qt_sink_st>(logger_name, qt_object, meta_method);
+}
+
+// log to QTextEdit with colorized output
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> qt_color_logger_mt(const std::string &logger_name,
+                                                  QTextEdit *qt_text_edit,
+                                                  int max_lines,
+                                                  bool is_utf8 = false) {
+    return Factory::template create<sinks::qt_color_sink_mt>(logger_name, qt_text_edit, max_lines,
+                                                             false, is_utf8);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> qt_color_logger_st(const std::string &logger_name,
+                                                  QTextEdit *qt_text_edit,
+                                                  int max_lines,
+                                                  bool is_utf8 = false) {
+    return Factory::template create<sinks::qt_color_sink_st>(logger_name, qt_text_edit, max_lines,
+                                                             false, is_utf8);
+}
+
+}  // namespace spdlog

3rd/spdlog/sinks/ringbuffer_sink.h

@@ -0,0 +1,67 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include "spdlog/details/circular_q.h"
+#include "spdlog/details/log_msg_buffer.h"
+#include "spdlog/details/null_mutex.h"
+#include "spdlog/sinks/base_sink.h"
+
+#include <mutex>
+#include <string>
+#include <vector>
+
+namespace spdlog {
+namespace sinks {
+/*
+ * Ring buffer sink
+ */
+template <typename Mutex>
+class ringbuffer_sink final : public base_sink<Mutex> {
+public:
+    explicit ringbuffer_sink(size_t n_items)
+        : q_{n_items} {}
+
+    std::vector<details::log_msg_buffer> last_raw(size_t lim = 0) {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        auto items_available = q_.size();
+        auto n_items = lim > 0 ? (std::min)(lim, items_available) : items_available;
+        std::vector<details::log_msg_buffer> ret;
+        ret.reserve(n_items);
+        for (size_t i = (items_available - n_items); i < items_available; i++) {
+            ret.push_back(q_.at(i));
+        }
+        return ret;
+    }
+
+    std::vector<std::string> last_formatted(size_t lim = 0) {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        auto items_available = q_.size();
+        auto n_items = lim > 0 ? (std::min)(lim, items_available) : items_available;
+        std::vector<std::string> ret;
+        ret.reserve(n_items);
+        for (size_t i = (items_available - n_items); i < items_available; i++) {
+            memory_buf_t formatted;
+            base_sink<Mutex>::formatter_->format(q_.at(i), formatted);
+            ret.push_back(SPDLOG_BUF_TO_STRING(formatted));
+        }
+        return ret;
+    }
+
+protected:
+    void sink_it_(const details::log_msg &msg) override {
+        q_.push_back(details::log_msg_buffer{msg});
+    }
+    void flush_() override {}
+
+private:
+    details::circular_q<details::log_msg_buffer> q_;
+};
+
+using ringbuffer_sink_mt = ringbuffer_sink<std::mutex>;
+using ringbuffer_sink_st = ringbuffer_sink<details::null_mutex>;
+
+}  // namespace sinks
+
+}  // namespace spdlog

3rd/spdlog/sinks/rotating_file_sink-inl.h

@@ -0,0 +1,144 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/sinks/rotating_file_sink.h>
+#endif
+
+#include <spdlog/common.h>
+
+#include <spdlog/details/file_helper.h>
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/fmt/fmt.h>
+
+#include <cerrno>
+#include <chrono>
+#include <ctime>
+#include <mutex>
+#include <string>
+#include <tuple>
+
+namespace spdlog {
+namespace sinks {
+
+template <typename Mutex>
+SPDLOG_INLINE rotating_file_sink<Mutex>::rotating_file_sink(
+    filename_t base_filename,
+    std::size_t max_size,
+    std::size_t max_files,
+    bool rotate_on_open,
+    const file_event_handlers &event_handlers)
+    : base_filename_(std::move(base_filename)),
+      max_size_(max_size),
+      max_files_(max_files),
+      file_helper_{event_handlers} {
+    if (max_size == 0) {
+        throw_spdlog_ex("rotating sink constructor: max_size arg cannot be zero");
+    }
+
+    if (max_files > 200000) {
+        throw_spdlog_ex("rotating sink constructor: max_files arg cannot exceed 200000");
+    }
+    file_helper_.open(calc_filename(base_filename_, 0));
+    current_size_ = file_helper_.size();  // expensive. called only once
+    if (rotate_on_open && current_size_ > 0) {
+        rotate_();
+        current_size_ = 0;
+    }
+}
+
+// calc filename according to index and file extension if exists.
+// e.g. calc_filename("logs/mylog.txt, 3) => "logs/mylog.3.txt".
+template <typename Mutex>
+SPDLOG_INLINE filename_t rotating_file_sink<Mutex>::calc_filename(const filename_t &filename,
+                                                                  std::size_t index) {
+    if (index == 0u) {
+        return filename;
+    }
+
+    filename_t basename, ext;
+    std::tie(basename, ext) = details::file_helper::split_by_extension(filename);
+    return fmt_lib::format(SPDLOG_FMT_STRING(SPDLOG_FILENAME_T("{}.{}{}")), basename, index, ext);
+}
+
+template <typename Mutex>
+SPDLOG_INLINE filename_t rotating_file_sink<Mutex>::filename() {
+    std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+    return file_helper_.filename();
+}
+
+template <typename Mutex>
+SPDLOG_INLINE void rotating_file_sink<Mutex>::sink_it_(const details::log_msg &msg) {
+    memory_buf_t formatted;
+    base_sink<Mutex>::formatter_->format(msg, formatted);
+    auto new_size = current_size_ + formatted.size();
+
+    // rotate if the new estimated file size exceeds max size.
+    // rotate only if the real size > 0 to better deal with full disk (see issue #2261).
+    // we only check the real size when new_size > max_size_ because it is relatively expensive.
+    if (new_size > max_size_) {
+        file_helper_.flush();
+        if (file_helper_.size() > 0) {
+            rotate_();
+            new_size = formatted.size();
+        }
+    }
+    file_helper_.write(formatted);
+    current_size_ = new_size;
+}
+
+template <typename Mutex>
+SPDLOG_INLINE void rotating_file_sink<Mutex>::flush_() {
+    file_helper_.flush();
+}
+
+// Rotate files:
+// log.txt -> log.1.txt
+// log.1.txt -> log.2.txt
+// log.2.txt -> log.3.txt
+// log.3.txt -> delete
+template <typename Mutex>
+SPDLOG_INLINE void rotating_file_sink<Mutex>::rotate_() {
+    using details::os::filename_to_str;
+    using details::os::path_exists;
+
+    file_helper_.close();
+    for (auto i = max_files_; i > 0; --i) {
+        filename_t src = calc_filename(base_filename_, i - 1);
+        if (!path_exists(src)) {
+            continue;
+        }
+        filename_t target = calc_filename(base_filename_, i);
+
+        if (!rename_file_(src, target)) {
+            // if failed try again after a small delay.
+            // this is a workaround to a windows issue, where very high rotation
+            // rates can cause the rename to fail with permission denied (because of antivirus?).
+            details::os::sleep_for_millis(100);
+            if (!rename_file_(src, target)) {
+                file_helper_.reopen(
+                    true);  // truncate the log file anyway to prevent it to grow beyond its limit!
+                current_size_ = 0;
+                throw_spdlog_ex("rotating_file_sink: failed renaming " + filename_to_str(src) +
+                                    " to " + filename_to_str(target),
+                                errno);
+            }
+        }
+    }
+    file_helper_.reopen(true);
+}
+
+// delete the target if exists, and rename the src file  to target
+// return true on success, false otherwise.
+template <typename Mutex>
+SPDLOG_INLINE bool rotating_file_sink<Mutex>::rename_file_(const filename_t &src_filename,
+                                                           const filename_t &target_filename) {
+    // try to delete the target file in case it already exists.
+    (void)details::os::remove(target_filename);
+    return details::os::rename(src_filename, target_filename) == 0;
+}
+
+}  // namespace sinks
+}  // namespace spdlog

3rd/spdlog/sinks/rotating_file_sink.h

@@ -0,0 +1,89 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/file_helper.h>
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/details/synchronous_factory.h>
+#include <spdlog/sinks/base_sink.h>
+
+#include <chrono>
+#include <mutex>
+#include <string>
+
+namespace spdlog {
+namespace sinks {
+
+//
+// Rotating file sink based on size
+//
+template <typename Mutex>
+class rotating_file_sink final : public base_sink<Mutex> {
+public:
+    rotating_file_sink(filename_t base_filename,
+                       std::size_t max_size,
+                       std::size_t max_files,
+                       bool rotate_on_open = false,
+                       const file_event_handlers &event_handlers = {});
+    static filename_t calc_filename(const filename_t &filename, std::size_t index);
+    filename_t filename();
+
+protected:
+    void sink_it_(const details::log_msg &msg) override;
+    void flush_() override;
+
+private:
+    // Rotate files:
+    // log.txt -> log.1.txt
+    // log.1.txt -> log.2.txt
+    // log.2.txt -> log.3.txt
+    // log.3.txt -> delete
+    void rotate_();
+
+    // delete the target if exists, and rename the src file  to target
+    // return true on success, false otherwise.
+    bool rename_file_(const filename_t &src_filename, const filename_t &target_filename);
+
+    filename_t base_filename_;
+    std::size_t max_size_;
+    std::size_t max_files_;
+    std::size_t current_size_;
+    details::file_helper file_helper_;
+};
+
+using rotating_file_sink_mt = rotating_file_sink<std::mutex>;
+using rotating_file_sink_st = rotating_file_sink<details::null_mutex>;
+
+}  // namespace sinks
+
+//
+// factory functions
+//
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> rotating_logger_mt(const std::string &logger_name,
+                                                  const filename_t &filename,
+                                                  size_t max_file_size,
+                                                  size_t max_files,
+                                                  bool rotate_on_open = false,
+                                                  const file_event_handlers &event_handlers = {}) {
+    return Factory::template create<sinks::rotating_file_sink_mt>(
+        logger_name, filename, max_file_size, max_files, rotate_on_open, event_handlers);
+}
+
+template <typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> rotating_logger_st(const std::string &logger_name,
+                                                  const filename_t &filename,
+                                                  size_t max_file_size,
+                                                  size_t max_files,
+                                                  bool rotate_on_open = false,
+                                                  const file_event_handlers &event_handlers = {}) {
+    return Factory::template create<sinks::rotating_file_sink_st>(
+        logger_name, filename, max_file_size, max_files, rotate_on_open, event_handlers);
+}
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "rotating_file_sink-inl.h"
+#endif

3rd/spdlog/sinks/sink-inl.h

@@ -0,0 +1,22 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/sinks/sink.h>
+#endif
+
+#include <spdlog/common.h>
+
+SPDLOG_INLINE bool spdlog::sinks::sink::should_log(spdlog::level::level_enum msg_level) const {
+    return msg_level >= level_.load(std::memory_order_relaxed);
+}
+
+SPDLOG_INLINE void spdlog::sinks::sink::set_level(level::level_enum log_level) {
+    level_.store(log_level, std::memory_order_relaxed);
+}
+
+SPDLOG_INLINE spdlog::level::level_enum spdlog::sinks::sink::level() const {
+    return static_cast<spdlog::level::level_enum>(level_.load(std::memory_order_relaxed));
+}

3rd/spdlog/sinks/sink.h

@@ -0,0 +1,34 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/details/log_msg.h>
+#include <spdlog/formatter.h>
+
+namespace spdlog {
+
+namespace sinks {
+class SPDLOG_API sink {
+public:
+    virtual ~sink() = default;
+    virtual void log(const details::log_msg &msg) = 0;
+    virtual void flush() = 0;
+    virtual void set_pattern(const std::string &pattern) = 0;
+    virtual void set_formatter(std::unique_ptr<spdlog::formatter> sink_formatter) = 0;
+
+    void set_level(level::level_enum log_level);
+    level::level_enum level() const;
+    bool should_log(level::level_enum msg_level) const;
+
+protected:
+    // sink log level - default is all
+    level_t level_{level::trace};
+};
+
+}  // namespace sinks
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "sink-inl.h"
+#endif

3rd/spdlog/sinks/stdout_color_sinks-inl.h

@@ -0,0 +1,38 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifndef SPDLOG_HEADER_ONLY
+    #include <spdlog/sinks/stdout_color_sinks.h>
+#endif
+
+#include <spdlog/common.h>
+#include <spdlog/logger.h>
+
+namespace spdlog {
+
+template <typename Factory>
+SPDLOG_INLINE std::shared_ptr<logger> stdout_color_mt(const std::string &logger_name,
+                                                      color_mode mode) {
+    return Factory::template create<sinks::stdout_color_sink_mt>(logger_name, mode);
+}
+
+template <typename Factory>
+SPDLOG_INLINE std::shared_ptr<logger> stdout_color_st(const std::string &logger_name,
+                                                      color_mode mode) {
+    return Factory::template create<sinks::stdout_color_sink_st>(logger_name, mode);
+}
+
+template <typename Factory>
+SPDLOG_INLINE std::shared_ptr<logger> stderr_color_mt(const std::string &logger_name,
+                                                      color_mode mode) {
+    return Factory::template create<sinks::stderr_color_sink_mt>(logger_name, mode);
+}
+
+template <typename Factory>
+SPDLOG_INLINE std::shared_ptr<logger> stderr_color_st(const std::string &logger_name,
+                                                      color_mode mode) {
+    return Factory::template create<sinks::stderr_color_sink_st>(logger_name, mode);
+}
+}  // namespace spdlog

3rd/spdlog/sinks/stdout_color_sinks.h

@@ -0,0 +1,49 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#ifdef _WIN32
+    #include <spdlog/sinks/wincolor_sink.h>
+#else
+    #include <spdlog/sinks/ansicolor_sink.h>
+#endif
+
+#include <spdlog/details/synchronous_factory.h>
+
+namespace spdlog {
+namespace sinks {
+#ifdef _WIN32
+using stdout_color_sink_mt = wincolor_stdout_sink_mt;
+using stdout_color_sink_st = wincolor_stdout_sink_st;
+using stderr_color_sink_mt = wincolor_stderr_sink_mt;
+using stderr_color_sink_st = wincolor_stderr_sink_st;
+#else
+using stdout_color_sink_mt = ansicolor_stdout_sink_mt;
+using stdout_color_sink_st = ansicolor_stdout_sink_st;
+using stderr_color_sink_mt = ansicolor_stderr_sink_mt;
+using stderr_color_sink_st = ansicolor_stderr_sink_st;
+#endif
+}  // namespace sinks
+
+template <typename Factory = spdlog::synchronous_factory>
+std::shared_ptr<logger> stdout_color_mt(const std::string &logger_name,
+                                        color_mode mode = color_mode::automatic);
+
+template <typename Factory = spdlog::synchronous_factory>
+std::shared_ptr<logger> stdout_color_st(const std::string &logger_name,
+                                        color_mode mode = color_mode::automatic);
+
+template <typename Factory = spdlog::synchronous_factory>
+std::shared_ptr<logger> stderr_color_mt(const std::string &logger_name,
+                                        color_mode mode = color_mode::automatic);
+
+template <typename Factory = spdlog::synchronous_factory>
+std::shared_ptr<logger> stderr_color_st(const std::string &logger_name,
+                                        color_mode mode = color_mode::automatic);
+
+}  // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+    #include "stdout_color_sinks-inl.h"
+#endif