Wip

example/example.cpp

@@ -4,231 +4,16 @@
 
 // spdlog usage example
 
-#include <cstdio>
 
-void stdout_logger_example();
-void basic_example();
-void rotating_example();
-void daily_example();
-void async_example();
-void binary_example();
-void trace_example();
-void multi_sink_example();
-void user_defined_example();
-void err_handler_example();
-void syslog_example();
 
-#include "spdlog/spdlog.h"
+#include <spdlog/spdlog.h>
+#include <spdlog/cfg/env.h>
 
-int main(int, char *[])
-{
-    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");
 
-    // 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);
-
-    // Backtrace support
-    // Loggers can store in a ring buffer all messages (including debug/trace) for later inspection.
-    // When needed, call dump_backtrace() to see what happened:
-    spdlog::enable_backtrace(10); // create ring buffer with capacity of 10  messages
-    for (int i = 0; i < 100; i++)
+int main(int, char *[]) {
+    auto cfg = spdlog::cfg::from_env();
+    for(auto &item:cfg)\
     {
-        spdlog::debug("Backtrace message {}", i); // not logged..
-    }
-    // e.g. if some error happened:
-    spdlog::dump_backtrace(); // log them now!
-
-    try
-    {
-        stdout_logger_example();
-        basic_example();
-        rotating_example();
-        daily_example();
-        async_example();
-        binary_example();
-        multi_sink_example();
-        user_defined_example();
-        err_handler_example();
-        trace_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;
+        spdlog::info("[{:>8}] level: {} pattern: {}", item.first, spdlog::level::to_string_view(item.second.level), item.second.pattern);
     }
 }
-
-#include "spdlog/sinks/stdout_color_sinks.h"
-// or #include "spdlog/sinks/stdout_sinks.h" if no colors needed.
-void stdout_logger_example()
-{
-    // Create color multi threaded 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");
-}
-
-#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/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(80);
-    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));
-}
-
-// 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");
-}
-
-// 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 by implementing operator<<
-#include "spdlog/fmt/ostr.h" // must be included
-struct my_type
-{
-    int i;
-    template<typename OStream>
-    friend OStream &operator<<(OStream &os, const my_type &c)
-    {
-        return os << "[my_type i=" << c.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

include/spdlog/details/os-inl.h

@@ -536,6 +536,20 @@ SPDLOG_INLINE filename_t dir_name(filename_t path)
     return pos != filename_t::npos ? path.substr(0, pos) : filename_t{};
 }
 
+std::string SPDLOG_INLINE getenv(const char* field)
+{
+#if defined(_MSC_VER) && !defined(__cplusplus_winrt)
+    size_t len = 0;
+    char buf[128];
+    bool ok = ::getenv_s(&len , buf, sizeof(buf), field) == 0;
+    return ok ? buf : std::string{};
+#else // revert to getenv
+    char *buf = ::getenv(field);
+    return buf ? buf : std::string{};
+#endif
+
+}
+
 } // namespace os
 } // namespace details
 } // namespace spdlog

include/spdlog/details/os.h

@@ -102,6 +102,10 @@ filename_t dir_name(filename_t path);
 // Return true if succeeded or if this dir already exists.
 bool create_dir(filename_t path);
 
+// non thread safe, cross platform getenv/getenv_s
+// return empty string if field not found
+std::string getenv(const char* field);
+
 } // namespace os
 } // namespace details
 } // namespace spdlog

src/spdlog.cpp

@@ -17,6 +17,7 @@
 #include "spdlog/sinks/sink-inl.h"
 #include "spdlog/sinks/base_sink-inl.h"
 #include "spdlog/details/null_mutex.h"
+#include "spdlog/cfg/env-inl.h"
 
 #include <mutex>