daily_file_sink with custom file name calculator

include/spdlog/sinks/file_sinks.h

@@ -139,10 +139,40 @@ private:
 typedef rotating_file_sink<std::mutex> rotating_file_sink_mt;
 typedef rotating_file_sink<details::null_mutex>rotating_file_sink_st;
 
+/*
+* Default generator of daily log file names.
+*/
+struct default_daily_file_name_calculator
+{
+    //Create filename for the form basename.YYYY-MM-DD_hh-mm.extension
+    static filename_t calc_filename(const filename_t& basename, const filename_t& extension)
+    {
+        std::tm tm = spdlog::details::os::localtime();
+        std::conditional<std::is_same<filename_t::value_type, char>::value, fmt::MemoryWriter, fmt::WMemoryWriter>::type w;
+        w.write(SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}_{:02d}-{:02d}.{}"), basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, extension);
+        return w.str();
+    }
+};
+
+/*
+* Generator of daily log file names in format basename.YYYY-MM-DD.extension
+*/
+struct dateonly_daily_file_name_calculator
+{
+    //Create filename for the form basename.YYYY-MM-DD.extension
+    static filename_t calc_filename(const filename_t& basename, const filename_t& extension)
+    {
+        std::tm tm = spdlog::details::os::localtime();
+        std::conditional<std::is_same<filename_t::value_type, char>::value, fmt::MemoryWriter, fmt::WMemoryWriter>::type w;
+        w.write(SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}.{}"), basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, extension);
+        return w.str();
+    }
+};
+
 /*
 * Rotating file sink based on date. rotates at midnight
 */
-template<class Mutex>
+template<class Mutex, class FileNameCalc = default_daily_file_name_calculator>
 class daily_file_sink :public base_sink < Mutex >
 {
 public:
@@ -161,7 +191,7 @@ public:
         if (rotation_hour < 0 || rotation_hour > 23 || rotation_minute < 0 || rotation_minute > 59)
             throw spdlog_ex("daily_file_sink: Invalid rotation time in ctor");
         _rotation_tp = _next_rotation_tp();
-        _file_helper.open(calc_filename(_base_filename, _extension));
+        _file_helper.open(FileNameCalc::calc_filename(_base_filename, _extension));
     }
 
     void flush() override
@@ -174,7 +204,7 @@ protected:
     {
         if (std::chrono::system_clock::now() >= _rotation_tp)
         {
-            _file_helper.open(calc_filename(_base_filename, _extension));
+            _file_helper.open(FileNameCalc::calc_filename(_base_filename, _extension));
             _rotation_tp = _next_rotation_tp();
         }
         _file_helper.write(msg);
@@ -197,15 +227,6 @@ private:
             return system_clock::time_point(rotation_time + hours(24));
     }
 
-    //Create filename for the form basename.YYYY-MM-DD.extension
-    static filename_t calc_filename(const filename_t& basename, const filename_t& extension)
-    {
-        std::tm tm = spdlog::details::os::localtime();
-        std::conditional<std::is_same<filename_t::value_type, char>::value, fmt::MemoryWriter, fmt::WMemoryWriter>::type w;
-        w.write(SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}_{:02d}-{:02d}.{}"), basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, extension);
-        return w.str();
-    }
-
     filename_t _base_filename;
     filename_t _extension;
     int _rotation_h;

tests/file_log.cpp

@@ -77,15 +77,56 @@ TEST_CASE("daily_logger", "[daily_logger]]")
 }
 
 
+TEST_CASE("daily_logger with dateonly calculator", "[daily_logger_dateonly]]")
+{
+    using sink_type = spdlog::sinks::daily_file_sink<
+        std::mutex,
+        spdlog::sinks::dateonly_daily_file_name_calculator>;
 
+    prepare_logdir();
+    //calculate filename (time based)
+    std::string basename = "logs/daily_dateonly";
+    std::tm tm = spdlog::details::os::localtime();
+    fmt::MemoryWriter w;
+    w.write("{}_{:04d}-{:02d}-{:02d}.txt", basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
 
+    auto logger = spdlog::create<sink_type>("logger", basename, "txt", 0, 0, true);
+    for (int i = 0; i < 10; ++i)
+        logger->info("Test message {}", i);
 
+    auto filename = w.str();
+    REQUIRE(count_lines(filename) == 10);
+}
 
+struct custom_daily_file_name_calculator
+{
+    static spdlog::filename_t calc_filename(const spdlog::filename_t& basename, const spdlog::filename_t& extension)
+    {
+        std::tm tm = spdlog::details::os::localtime();
+        fmt::MemoryWriter w;
+        w.write("{}{:04d}{:02d}{:02d}.{}", basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, extension);
+        return w.str();
+    }
+};
+
+TEST_CASE("daily_logger with custom calculator", "[daily_logger_custom]]")
+{
+    using sink_type = spdlog::sinks::daily_file_sink<
+        std::mutex,
+        custom_daily_file_name_calculator>;
 
+    prepare_logdir();
+    //calculate filename (time based)
+    std::string basename = "logs/daily_dateonly";
+    std::tm tm = spdlog::details::os::localtime();
+    fmt::MemoryWriter w;
+    w.write("{}{:04d}{:02d}{:02d}.txt", basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
 
+    auto logger = spdlog::create<sink_type>("logger", basename, "txt", 0, 0, true);
+    for (int i = 0; i < 10; ++i)
+        logger->info("Test message {}", i);
 
-
-
-
-
+    auto filename = w.str();
+    REQUIRE(count_lines(filename) == 10);
+}