From c150d63d54ce97fea41ec1cfe9224864b2a4b56c Mon Sep 17 00:00:00 2001
From: pjft <paulo.j.tavares@gmail.com>
Date: Tue, 1 Aug 2017 11:34:49 +0100
Subject: [PATCH] Backup previous session's Log file
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Always keeps one session’s log backup file.
---
 es-app/src/main.cpp | 1 +
 es-core/src/Log.cpp | 9 +++++++++
 es-core/src/Log.h   | 1 +
 3 files changed, 11 insertions(+)

diff --git a/es-app/src/main.cpp b/es-app/src/main.cpp
index 49bd9c058..46085e591 100644
--- a/es-app/src/main.cpp
+++ b/es-app/src/main.cpp
@@ -222,6 +222,7 @@ int main(int argc, char* argv[])
 		return 1;
 
 	//start the logger
+	Log::init();
 	Log::open();
 	LOG(LogInfo) << "EmulationStation - v" << PROGRAM_VERSION_STRING << ", built " << PROGRAM_BUILT_STRING;
 
diff --git a/es-core/src/Log.cpp b/es-core/src/Log.cpp
index 643aef16a..811bbb8cc 100644
--- a/es-core/src/Log.cpp
+++ b/es-core/src/Log.cpp
@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <iostream>
+#include <stdio.h>
 #include "platform.h"
 
 LogLevel Log::reportingLevel = LogInfo;
@@ -23,6 +24,14 @@ void Log::setReportingLevel(LogLevel level)
 	reportingLevel = level;
 }
 
+void Log::init()
+{
+	remove((getLogPath() + ".bak").c_str());
+	// rename previous log file
+	rename(getLogPath().c_str(), (getLogPath() + ".bak").c_str());
+	return;
+}
+
 void Log::open()
 {
 	file = fopen(getLogPath().c_str(), "w");
diff --git a/es-core/src/Log.h b/es-core/src/Log.h
index fbc033d40..b0f985984 100644
--- a/es-core/src/Log.h
+++ b/es-core/src/Log.h
@@ -24,6 +24,7 @@ public:
 	static std::string getLogPath();
 
 	static void flush();
+	static void init();
 	static void open();
 	static void close();
 protected: