NEW: limit log files within 30 by deleting old files

Change-Id: I1bb5c827c7fb01d97b84a4a1bf3f905bb8e90448
(cherry picked from commit 065ef224357352851cbba2c0dcac131ea9acae82)

src/slic3r/GUI/GUI_App.cpp

@@ -1096,6 +1096,31 @@ void GUI_App::post_init()
     std::string functional_config_file = Slic3r::resources_dir() + "/config.json";
     DeviceManager::load_functional_config(encode_path(functional_config_file.c_str()));
 
+    // remove old log files over LOG_FILES_MAX_NUM
+    std::string log_addr = data_dir();
+    if (!log_addr.empty()) {
+        auto log_folder = boost::filesystem::path(log_addr) / "log";
+        if (boost::filesystem::exists(log_folder)) {
+           std::vector<std::pair<time_t, std::string>> files_vec;
+           for (auto& it : boost::filesystem::directory_iterator(log_folder)) {
+               auto temp_path = it.path();
+               std::time_t lw_t = boost::filesystem::last_write_time(temp_path) ;
+               files_vec.push_back({ lw_t, temp_path.filename().string() });
+           }
+           std::sort(files_vec.begin(), files_vec.end(), [](
+               std::pair<time_t, std::string> &a, std::pair<time_t, std::string> &b) {
+               return a.first > b.first;
+           });
+
+           while (files_vec.size() > LOG_FILES_MAX_NUM) {
+               auto full_path = log_folder / boost::filesystem::path(files_vec[files_vec.size() - 1].second);
+               BOOST_LOG_TRIVIAL(info) << "delete log file over " << LOG_FILES_MAX_NUM << ", filename: "<< files_vec[files_vec.size() - 1].second;
+               boost::filesystem::remove(full_path);
+               files_vec.pop_back();
+           }
+        }
+    }
+
     BOOST_LOG_TRIVIAL(info) << "finished post_init";
 //BBS: remove the single instance currently
 /*#ifdef _WIN32

src/slic3r/GUI/GUI_App.hpp

@@ -26,6 +26,7 @@
 
 #define BBL_HAS_FIRST_PAGE          1
 #define STUDIO_INACTIVE_TIMEOUT     15*60*1000
+#define LOG_FILES_MAX_NUM           30
 
 class wxMenuItem;
 class wxMenuBar;