Fix example

example/example.cpp

@@ -31,10 +31,298 @@ void replace_default_logger_example();
 #include "spdlog/spdlog.h"
 #include "spdlog/version.h"
 
-#include "fmt/xchar.h"
-int main(int, char *[]) { 
-    std::wstring wideStr = L"Hello, Wide World!";
+int main(int, char *[]) {
+    // Log levels can be loaded from argv/env using "SPDLOG_LEVEL"
+    load_levels_example();
+    SPDLOG_INFO("This message should be displayed..");
+    spdlog::info("Welcome to spdlog version {}.{}.{} !", SPDLOG_VER_MAJOR, SPDLOG_VER_MINOR, SPDLOG_VER_PATCH);
+    spdlog::warn("Easy padding in numbers like {:08d}", 12);
+    spdlog::critical("Support for int: {0:d};  hex: {0:x};  oct: {0:o}; bin: {0:b}", 42);
+    spdlog::info("Support for floats {:03.2f}", 1.23456);
+    spdlog::info("Positional args are {1} {0}..", "too", "supported");
+    spdlog::info("{:>8} aligned, {:<8} aligned", "right", "left");
 
-    // Print directly to the console
-    fmt::print(L"{}\n", wideStr);
-}
+    // Runtime log levels
+    spdlog::set_level(spdlog::level::info);  // Set global log level to info
+    spdlog::debug("This message should not be displayed!");
+    spdlog::set_level(spdlog::level::trace);  // Set specific logger's log level
+    spdlog::debug("This message should be displayed..");
+
+    // Customize msg format for all loggers
+    spdlog::set_pattern("[%H:%M:%S %z] [%^%L%$] [thread %t] %v");
+    spdlog::info("This an info message with custom format");
+    spdlog::set_pattern("%+");  // back to default format
+    spdlog::set_level(spdlog::level::info);
+
+    try {
+        stdout_logger_example();
+        basic_example();
+        rotating_example();
+        daily_example();
+        callback_example();
+        async_example();
+        binary_example();
+        vector_example();
+        multi_sink_example();
+        user_defined_example();
+        err_handler_example();
+        trace_example();
+        stopwatch_example();
+        udp_example();
+        custom_flags_example();
+        file_events_example();
+        replace_default_logger_example();
+
+        // Flush all *registered* loggers using a worker thread every 3 seconds.
+        // note: registered loggers *must* be thread safe for this to work correctly!
+        spdlog::flush_every(std::chrono::seconds(3));
+
+        // Apply some function on all registered loggers
+        spdlog::apply_all([&](std::shared_ptr<spdlog::logger> l) { l->info("End of example."); });
+
+        // Release all spdlog resources, and drop all loggers in the registry.
+        // This is optional (only mandatory if using windows + async log).
+        spdlog::shutdown();
+    }
+
+    // Exceptions will only be thrown upon failed logger or sink construction (not during logging).
+    catch (const spdlog::spdlog_ex &ex) {
+        std::printf("Log initialization failed: %s\n", ex.what());
+        return 1;
+    }
+}
+
+#include "spdlog/sinks/stdout_color_sinks.h"
+// or #include "spdlog/sinks/stdout_sinks.h" if no colors needed.
+void stdout_logger_example() {
+    // Create color multithreading logger.
+    auto console = spdlog::stdout_color_mt("console");
+    // or for stderr:
+    // auto console = spdlog::stderr_color_mt("error-logger");
+}
+
+#include "spdlog/sinks/basic_file_sink.h"
+void basic_example() {
+    // Create basic file logger (not rotated).
+    auto my_logger = spdlog::basic_logger_mt("file_logger", "logs/basic-log.txt", true);
+}
+
+#include "spdlog/sinks/rotating_file_sink.h"
+void rotating_example() {
+    // Create a file rotating logger with 5mb size max and 3 rotated files.
+    auto rotating_logger = spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", 1048576 * 5, 3);
+}
+
+#include "spdlog/sinks/daily_file_sink.h"
+void daily_example() {
+    // Create a daily logger - a new file is created every day on 2:30am.
+    auto daily_logger = spdlog::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30);
+}
+
+#include "spdlog/sinks/callback_sink.h"
+void callback_example() {
+    // Create the logger
+    auto logger = spdlog::callback_logger_mt("custom_callback_logger", [](const spdlog::details::log_msg & /*msg*/) {
+        // do what you need to do with msg
+    });
+}
+
+void load_levels_example() {
+    // Set the log level to "info" and mylogger to "trace":
+    // SPDLOG_LEVEL=info,mylogger=trace && ./example
+    // must #include "spdlog/cfg/env.h"
+    spdlog::cfg::load_env_levels();
+    // or from command line:
+    // ./example SPDLOG_LEVEL=info,mylogger=trace
+    // #include "spdlog/cfg/argv.h" // for loading levels from argv
+    // spdlog::cfg::load_argv_levels(args, argv);
+}
+
+#include "spdlog/async.h"
+void async_example() {
+    // Default thread pool settings can be modified *before* creating the async logger:
+    // spdlog::init_thread_pool(32768, 1); // queue with max 32k items 1 backing thread.
+    auto async_file = spdlog::basic_logger_mt<spdlog::async_factory>("async_file_logger", "logs/async_log.txt");
+    // alternatively:
+    // auto async_file =
+    // spdlog::create_async<spdlog::sinks::basic_file_sink_mt>("async_file_logger",
+    // "logs/async_log.txt");
+
+    for (int i = 1; i < 101; ++i) {
+        async_file->info("Async message #{}", i);
+    }
+}
+
+// Log binary data as hex.
+// Many types of std::container<char> types can be used.
+// Iterator ranges are supported too.
+// Format flags:
+// {: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.
+
+#include "spdlog/fmt/bin_to_hex.h"
+void binary_example() {
+    std::vector<char> buf;
+    for (int i = 0; i < 80; i++) {
+        buf.push_back(static_cast<char>(i & 0xff));
+    }
+    spdlog::info("Binary example: {}", spdlog::to_hex(buf));
+    spdlog::info("Another binary example:{:n}", spdlog::to_hex(std::begin(buf), std::begin(buf) + 10));
+    // more examples:
+    // logger->info("uppercase: {:X}", spdlog::to_hex(buf));
+    // logger->info("uppercase, no delimiters: {:Xs}", spdlog::to_hex(buf));
+    // logger->info("uppercase, no delimiters, no position info: {:Xsp}", spdlog::to_hex(buf));
+    // logger->info("hexdump style: {:a}", spdlog::to_hex(buf));
+    // logger->info("hexdump style, 20 chars per line {:a}", spdlog::to_hex(buf, 20));
+}
+
+// Log a vector of numbers
+#include "fmt/ranges.h"
+void vector_example() {
+    std::vector<int> vec = {1, 2, 3};
+    spdlog::info("Vector example: {}", vec);
+}
+
+// Compile time log levels.
+// define SPDLOG_ACTIVE_LEVEL to required level (e.g. SPDLOG_LEVEL_TRACE)
+void trace_example() {
+    // trace from default logger
+    SPDLOG_TRACE("Some trace message.. {} ,{}", 1, 3.23);
+    // debug from default logger
+    SPDLOG_DEBUG("Some debug message.. {} ,{}", 1, 3.23);
+
+    // trace from logger object
+    auto logger = spdlog::get("file_logger");
+    SPDLOG_LOGGER_TRACE(logger, "another trace message");
+}
+
+// stopwatch example
+#include <thread>
+
+#include "spdlog/stopwatch.h"
+void stopwatch_example() {
+    spdlog::stopwatch sw;
+    std::this_thread::sleep_for(std::chrono::milliseconds(123));
+    spdlog::info("Stopwatch: {} seconds", sw);
+}
+
+#include "spdlog/sinks/udp_sink.h"
+void udp_example() {
+    spdlog::sinks::udp_sink_config cfg("127.0.0.1", 11091);
+    auto my_logger = spdlog::udp_logger_mt("udplog", cfg);
+    my_logger->set_level(spdlog::level::debug);
+    my_logger->info("hello world");
+}
+
+// A logger with multiple sinks (stdout and file) - each with a different format and log level.
+void multi_sink_example() {
+    auto console_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt>();
+    console_sink->set_level(spdlog::level::warn);
+    console_sink->set_pattern("[multi_sink_example] [%^%l%$] %v");
+
+    auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/multisink.txt", true);
+    file_sink->set_level(spdlog::level::trace);
+
+    spdlog::logger logger("multi_sink", {console_sink, file_sink});
+    logger.set_level(spdlog::level::debug);
+    logger.warn("this should appear in both console and file");
+    logger.info("this message should not appear in the console, only in the file");
+}
+
+// User defined types logging
+struct my_type {
+    int i = 0;
+    explicit my_type(int i)
+        : i(i) {}
+};
+
+template <>
+struct fmt::formatter<my_type> : fmt::formatter<std::string> {
+    auto format(my_type my, format_context &ctx) const -> decltype(ctx.out()) {
+        return fmt::format_to(ctx.out(), "[my_type i={}]", my.i);
+    }
+};
+
+void user_defined_example() { spdlog::info("user defined type: {}", my_type(14)); }
+
+// Custom error handler. Will be triggered on log failure.
+void err_handler_example() {
+    // can be set globally or per logger(logger->set_error_handler(..))
+    spdlog::set_error_handler([](const std::string &msg) { printf("*** Custom log error handler: %s ***\n", msg.c_str()); });
+}
+
+// syslog example (linux/osx/freebsd)
+#ifndef _WIN32
+    #include "spdlog/sinks/syslog_sink.h"
+void syslog_example() {
+    std::string ident = "spdlog-example";
+    auto syslog_logger = spdlog::syslog_logger_mt("syslog", ident, LOG_PID);
+    syslog_logger->warn("This is warning that will end up in syslog.");
+}
+#endif
+
+// Android example.
+#if defined(__ANDROID__)
+    #include "spdlog/sinks/android_sink.h"
+void android_example() {
+    std::string tag = "spdlog-android";
+    auto android_logger = spdlog::android_logger_mt("android", tag);
+    android_logger->critical("Use \"adb shell logcat\" to view this message.");
+}
+#endif
+
+// Log patterns can contain custom flags.
+// this will add custom flag '%*' which will be bound to a <my_formatter_flag> instance
+#include "spdlog/pattern_formatter.h"
+class my_formatter_flag : public spdlog::custom_flag_formatter {
+public:
+    void format(const spdlog::details::log_msg &, const std::tm &, spdlog::memory_buf_t &dest) override {
+        std::string some_txt = "custom-flag";
+        dest.append(some_txt.data(), some_txt.data() + some_txt.size());
+    }
+
+    [[nodiscard]]
+    std::unique_ptr<custom_flag_formatter> clone() const override {
+        return std::make_unique<my_formatter_flag>();
+    }
+};
+
+void custom_flags_example() {
+    auto formatter = std::make_unique<spdlog::pattern_formatter>();
+    formatter->add_flag<my_formatter_flag>('*').set_pattern("[%n] [%*] [%^%l%$] %v");
+    // set the new formatter using spdlog::set_formatter(formatter) or
+    // logger->set_formatter(formatter) spdlog::set_formatter(std::move(formatter));
+}
+
+void file_events_example() {
+    // pass the spdlog::file_event_handlers to file sinks for open/close log file notifications
+    spdlog::file_event_handlers handlers;
+    handlers.before_open = [](spdlog::filename_t filename) { spdlog::info("Before opening logfile"); };
+    handlers.after_open = [](spdlog::filename_t filename, std::FILE *fstream) {
+        spdlog::info("After opening logfile");
+        fputs("After opening\n", fstream);
+    };
+    handlers.before_close = [](spdlog::filename_t filename, std::FILE *fstream) {
+        spdlog::info("Before closing logfile");
+        fputs("Before closing\n", fstream);
+    };
+    handlers.after_close = [](spdlog::filename_t filename) { spdlog::info("After closing logfile"); };
+    auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>("logs/events-sample.txt", true, handlers);
+    spdlog::logger my_logger("some_logger", file_sink);
+    my_logger.info("Some log line");
+}
+
+void replace_default_logger_example() {
+    // store the old logger so we don't break other examples.
+    auto old_logger = spdlog::default_logger();
+
+    auto new_logger = spdlog::basic_logger_mt("new_default_logger", "logs/new-default-log.txt", true);
+    spdlog::set_default_logger(new_logger);
+    spdlog::set_level(spdlog::level::info);
+    spdlog::debug("This message should not be displayed!");
+    spdlog::set_level(spdlog::level::trace);
+    spdlog::debug("This message should be displayed..");
+    spdlog::set_default_logger(old_logger);
+}