[Sessions] Last 2 sessions are now backuped in profile directory.

Closes #1100

CHANGELOG

@@ -17,6 +17,7 @@ Version 1.5.0
     * cancel upload when trying to upload non-readable files
     * select previous / next engines with ctrl+up/down in websearchbar
     * ask user first before closing all but the current tab from tabbar
+    * last 2 sessions are now backuped in profile directory
     * GreaseMonkey: added icon in statusbar
     * GreaseMonkey: added support for GM_Settings
     * GreaseMonkey: fixed userscripts when first loading plugin

src/lib/app/mainapplication.cpp

@@ -289,6 +289,9 @@ MainApplication::MainApplication(int &argc, char** argv)
         if (checkUpdates) {
             new Updater(qupzilla);
         }
+
+        backupSavedSessions();
+
         if (m_startingAfterCrash || afterLaunch == 3) {
             m_restoreManager = new RestoreManager(m_activeProfil + "session.dat");
             if (!m_restoreManager->isValid()) {
@@ -763,6 +766,27 @@ void MainApplication::translateApp()
     installTranslator(sys);
 }
 
+void MainApplication::backupSavedSessions()
+{
+    // session.dat      - current
+    // session.dat.old  - first backup
+    // session.dat.old1 - second backup
+
+    const QString sessionFile = m_activeProfil + "session.dat";
+
+    if (!QFile::exists(sessionFile)) {
+        return;
+    }
+
+    if (QFile::exists(sessionFile + ".old")) {
+        QFile::remove(sessionFile + ".old1");
+        QFile::copy(sessionFile + ".old", sessionFile + ".old1");
+    }
+
+    QFile::remove(sessionFile + ".old");
+    QFile::copy(sessionFile, sessionFile + ".old");
+}
+
 void MainApplication::quitApplication()
 {
     if (m_downloadManager && !m_downloadManager->canClose()) {

src/lib/app/mainapplication.h

@@ -163,6 +163,7 @@ private:
     void loadTheme(const QString &name);
     void translateApp();
     void restoreOtherWindows();
+    void backupSavedSessions();
 
     QUrl userStyleSheet(const QString &filePath) const;