commit 2d6bc609769eaa4a70a6dd384351f54c6633f3a9
Author: dentiny <dentinyhao@gmail.com>
Date:   Thu Dec 19 17:17:56 2024 +0000

    patch spdlog rotation filename

    Signed-off-by: dentiny <dentinyhao@gmail.com>

diff --git a/include/spdlog/sinks/rotating_file_sink-inl.h b/include/spdlog/sinks/rotating_file_sink-inl.h
index cf8b9d5c..7580c06f 100644
--- a/include/spdlog/sinks/rotating_file_sink-inl.h
+++ b/include/spdlog/sinks/rotating_file_sink-inl.h
@@ -49,7 +49,7 @@ SPDLOG_INLINE rotating_file_sink<Mutex>::rotating_file_sink(
 }
 
 // calc filename according to index and file extension if exists.
-// e.g. calc_filename("logs/mylog.txt, 3) => "logs/mylog.3.txt".
+// e.g. calc_filename("logs/mylog.txt, 3) => "logs/mylog.txt.3".
 template <typename Mutex>
 SPDLOG_INLINE filename_t rotating_file_sink<Mutex>::calc_filename(const filename_t &filename,
                                                                   std::size_t index) {
@@ -57,10 +57,7 @@ SPDLOG_INLINE filename_t rotating_file_sink<Mutex>::calc_filename(const filename
         return filename;
     }
 
-    filename_t basename;
-    filename_t 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);
+    return fmt_lib::format(SPDLOG_FMT_STRING(SPDLOG_FILENAME_T("{}.{}")), filename, index);
 }
 
 template <typename Mutex>