add function for keeping old logs

components/openmw-mp/Log.cpp

@@ -9,6 +9,7 @@
 #include <cstdio>
 #include <sstream>
 #include <vector>
+#include <boost/lexical_cast.hpp>
 #include "Log.hpp"
 
 using namespace std;
@@ -104,3 +105,21 @@ void Log::print(int level, bool hasPrefix, const char *file, int line, const cha
     va_end(args);
     cout << buf.data() << flush;
 }
+
+string Log::copyOldLog(boost::filesystem::path path, string name, string extension)
+{
+    namespace fs = boost::filesystem;
+    fs::directory_iterator end_iter;
+
+    std::string fullname = name + "." + extension;
+
+    if (fs::exists(path / fullname))
+    {
+        std::string newname;
+        for (int i = 1; fs::exists(path / (newname = name + boost::lexical_cast<string>(i++) + "." + extension)););
+
+        fs::rename(path / fullname, path / newname);
+        return newname;
+    }
+    return fullname;
+}

components/openmw-mp/Log.hpp

@@ -5,6 +5,8 @@
 #ifndef OPENMW_LOG_HPP
 #define OPENMW_LOG_HPP
 
+#include <boost/filesystem.hpp>
+
 #ifdef __GNUC__
 #pragma GCC system_header
 #endif
@@ -44,6 +46,8 @@ public:
     static const Log &Get();
     static void SetLevel(int level);
     void print(int level, bool hasPrefix, const char *file, int line, const char *message, ...) const;
+
+    static std::string copyOldLog(boost::filesystem::path path, std::string name, std::string extension);
 private:
     Log(int logLevel);
     /// Not implemented