feat: 自动清理log目录 (#8)

Author: MistEO

include/MaaUtils/Logger.h

@@ -75,6 +75,7 @@ class MAA_UTILS_API Logger
     Logger() = default;
 
     void reinit();
+    void cleanup();
     bool rotate();
     void open(bool append = true);
     void close();

source/Logger/Logger.cpp

@@ -2,6 +2,8 @@
 
 #include "MaaUtils/Logger.h"
 
+#include <thread>
+
 #ifdef _WIN32
 #include "MaaUtils/SafeWindows.hpp"
 
@@ -109,11 +111,47 @@ void Logger::flush()
 
 void Logger::reinit()
 {
+    cleanup();
     bool rotated = rotate();
     open(!rotated);
     log_proc_info();
 }
 
+static void remove_old_files(const std::filesystem::path& dir)
+{
+    constexpr auto kMaxAge = std::chrono::hours(24 * 7); // 一周
+    const auto now = std::filesystem::file_time_type::clock::now();
+
+    std::error_code ec;
+    for (const auto& entry : std::filesystem::recursive_directory_iterator(dir, ec)) {
+        if (ec) {
+            break;
+        }
+        if (!entry.is_regular_file(ec) || ec) {
+            continue;
+        }
+
+        auto last_write = entry.last_write_time(ec);
+        if (ec) {
+            continue;
+        }
+
+        auto age = now - last_write;
+        if (age > kMaxAge) {
+            std::filesystem::remove(entry.path(), ec);
+        }
+    }
+}
+
+void Logger::cleanup()
+{
+    if (log_dir_.empty() || !std::filesystem::exists(log_dir_)) {
+        return;
+    }
+
+    std::thread(remove_old_files, log_dir_).detach();
+}
+
 bool Logger::rotate()
 {
     if (log_path_.empty() || !std::filesystem::exists(log_path_)) {