App now can be safely restarted, fixed #61.

resources/text/CHANGELOG

@@ -13,6 +13,7 @@ Fixed:
 
 Added:
 <ul>
+<li>Application can now be safely restarted from within main menu.</li>
 <li>HTTP request for feed files now contains special "Accept" header.</li>
 <li>Recycle bin with ability to trash or restore the whole bin or individual messages.</li>
 <li>MySQL backend now allows to defragment/optimize RSS Guard database.</li>

src/gui/formmain.cpp

@@ -87,6 +87,7 @@ QList<QAction*> FormMain::allActions() {
   actions << m_ui->m_actionSettings;
   actions << m_ui->m_actionImportFeeds;
   actions << m_ui->m_actionExportFeeds;
+  actions << m_ui->m_actionRestart;
   actions << m_ui->m_actionQuit;
   actions << m_ui->m_actionFullscreen;
   actions << m_ui->m_actionAboutGuard;
@@ -202,6 +203,7 @@ void FormMain::setupIcons() {
   // Setup icons of this main window.
   m_ui->m_actionSettings->setIcon(icon_theme_factory->fromTheme("application-settings"));
   m_ui->m_actionQuit->setIcon(icon_theme_factory->fromTheme("application-exit"));
+  m_ui->m_actionRestart->setIcon(icon_theme_factory->fromTheme("go-refresh"));
   m_ui->m_actionAboutGuard->setIcon(icon_theme_factory->fromTheme("application-about"));
   m_ui->m_actionCheckForUpdates->setIcon(icon_theme_factory->fromTheme("check-for-updates"));
   m_ui->m_actionDefragmentDatabase->setIcon(icon_theme_factory->fromTheme("defragment-database"));
@@ -328,6 +330,7 @@ void FormMain::createConnections() {
   // Menu "File" connections.
   connect(m_ui->m_actionExportFeeds, SIGNAL(triggered()), this, SLOT(exportFeeds()));
   connect(m_ui->m_actionImportFeeds, SIGNAL(triggered()), this, SLOT(importFeeds()));
+  connect(m_ui->m_actionRestart, SIGNAL(triggered()), qApp, SLOT(restart()));
   connect(m_ui->m_actionQuit, SIGNAL(triggered()), qApp, SLOT(quit()));
 
   // Menu "View" connections.

src/gui/formmain.ui

@@ -58,6 +58,7 @@
     <addaction name="m_actionImportFeeds"/>
     <addaction name="m_actionExportFeeds"/>
     <addaction name="separator"/>
+    <addaction name="m_actionRestart"/>
     <addaction name="m_actionQuit"/>
    </widget>
    <widget class="QMenu" name="m_menuHelp">
@@ -609,6 +610,11 @@
     <string>Restore &amp;selected messages</string>
    </property>
   </action>
+  <action name="m_actionRestart">
+   <property name="text">
+    <string>&amp;Restart</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>

src/miscellaneous/application.cpp

@@ -32,7 +32,7 @@ Application::Application(const QString &id, int &argc, char **argv)
   : QtSingleApplication(id, argc, argv),
     m_closeLock(NULL), m_userActions(QList<QAction*>()), m_mainForm(NULL),
     m_trayIcon(NULL), m_settings(NULL), m_system(NULL), m_skins(NULL),
-    m_localization(NULL), m_icons(NULL), m_database(NULL) {
+    m_localization(NULL), m_icons(NULL), m_database(NULL), m_shouldRestart(false) {
   connect(this, SIGNAL(aboutToQuit()), this, SLOT(onAboutToQuit()));
   connect(this, SIGNAL(commitDataRequest(QSessionManager&)), this, SLOT(onCommitData(QSessionManager&)));
   connect(this, SIGNAL(saveStateRequest(QSessionManager&)), this, SLOT(onSaveState(QSessionManager&)));
@@ -159,4 +159,28 @@ void Application::onAboutToQuit() {
     // that some critical action can be processed right now.
     qDebug("Close lock timed-out.");
   }
+
+  // Now, we can check if application should just quit or restart itself.
+  if (m_shouldRestart) {
+    // TODO: Disable qtsinglepplication.
+    // TODO: Start new instance.
+    if (QProcess::startDetached(applicationFilePath())) {
+      finish();
+      qWarning("New application instance was not started successfully.");
+    }
+  }
 }
+
+bool Application::shouldRestart() const {
+  return m_shouldRestart;
+}
+
+void Application::setShouldRestart(bool shouldRestart) {
+  m_shouldRestart = shouldRestart;
+}
+
+void Application::restart() {
+  m_shouldRestart = true;
+  quit();
+}
+

src/miscellaneous/application.h

@@ -1,4 +1,4 @@
-// This file is part of RSS Guard.
+// This file is part of RSS Guard.
 //
 // Copyright (C) 2011-2014 by Martin Rotter <rotter.martinos@gmail.com>
 //
@@ -144,7 +144,12 @@ class Application : public QtSingleApplication {
       return static_cast<Application*>(QCoreApplication::instance());
     }
 
+    bool shouldRestart() const;
+    void setShouldRestart(bool shouldRestart);
+
   public slots:
+    void restart();
+
     // Processes incoming message from another RSS Guard instance.
     void processExecutionMessage(const QString &message);
 
@@ -177,6 +182,7 @@ class Application : public QtSingleApplication {
     Localization *m_localization;
     IconFactory *m_icons;
     DatabaseFactory *m_database;
+    bool m_shouldRestart;
 };
 
 #endif // APPLICATION_H

src/qtsingleapplication/qtsingleapplication.cpp

@@ -329,6 +329,10 @@ void QtSingleApplication::activateWindow()
     }
 }
 
+void QtSingleApplication::finish()
+{
+  delete peer; peer = 0;
+}
 
 /*!
     \fn void QtSingleApplication::messageReceived(const QString& message)

src/qtsingleapplication/qtsingleapplication.h

@@ -90,6 +90,7 @@ public:
 public Q_SLOTS:
     bool sendMessage(const QString &message, int timeout = 5000);
     void activateWindow();
+    void finish();
 
 
 Q_SIGNALS: