Add simple versioned autosave.

include/SetupDialog.h

@@ -93,6 +93,7 @@ private slots:
 	void resetAutoSave();
 	void toggleAutoSave(bool enabled);
 	void toggleRunningAutoSave(bool enabled);
+	void toggleVersionedAutoSave(bool enabled);
 	void toggleSmoothScroll(bool enabled);
 	void toggleAnimateAFP(bool enabled);
 	void vstEmbedMethodChanged();
@@ -156,10 +157,12 @@ private slots:
 	int m_saveInterval;
 	bool m_enableAutoSave;
 	bool m_enableRunningAutoSave;
+	bool m_enableVersionedAutoSave;
 	QSlider * m_saveIntervalSlider;
 	QLabel * m_saveIntervalLbl;
 	QCheckBox * m_autoSave;
 	QCheckBox * m_runningAutoSave;
+	QCheckBox * m_versionedAutoSave;
 	bool m_smoothScroll;
 	bool m_animateAFP;
 	QLabel * m_vstEmbedLbl;

include/Song.h

@@ -327,6 +327,12 @@ class LMMS_EXPORT Song : public TrackContainer
 		return m_modified;
 	}
 
+
+	bool isModifiedAutosave() const
+	{
+		return m_modifiedautosave;
+	}
+
 	QString nodeName() const override
 	{
 		return "song";
@@ -389,6 +395,7 @@ public slots:
 
 
 	void setModified();
+	void setModifiedAutosave(bool value);
 
 	void clearProject();
 
@@ -469,6 +476,7 @@ private slots:
 	QString m_fileName;
 	QString m_oldFileName;
 	bool m_modified;
+	bool m_modifiedautosave;
 	bool m_loadOnLaunch;
 
 	volatile bool m_recording;

src/core/Song.cpp

@@ -447,11 +447,25 @@ void Song::processMetronome(size_t bufferOffset)
 
 void Song::setModified(bool value)
 {
+	//Split in two for performance reasons?
 	if( !m_loadingProject && m_modified != value)
 	{
 		m_modified = value;
+		m_modifiedautosave = value;
 		emit modified();
 	}
+	else if ( !m_loadingProject && m_modified == value)
+	{
+		m_modifiedautosave = value;
+	}
+}
+
+void Song::setModifiedAutosave(bool value)
+{
+	if( !m_loadingProject && m_modifiedautosave != value)
+	{
+		m_modifiedautosave = value;
+	}
 }
 
 bool Song::isExportDone() const

src/gui/MainWindow.cpp

@@ -1363,15 +1363,30 @@ void MainWindow::browseHelp()
 
 void MainWindow::autoSave()
 {
-	if( !Engine::getSong()->isExporting() &&
+
+	if ( Engine::getSong()->isModifiedAutosave() &&
+		!Engine::getSong()->isExporting() &&
 		!Engine::getSong()->isLoadingProject() &&
 		!RemotePluginBase::isMainThreadWaiting() &&
 		!QApplication::mouseButtons() &&
 		( ConfigManager::inst()->value( "ui",
 				"enablerunningautosave" ).toInt() ||
 			! Engine::getSong()->isPlaying() ) )
 	{
+		//Recovery file is still needed for post-crash recovery dialog.
 		Engine::getSong()->saveProjectFile(ConfigManager::inst()->recoveryFile());
+		if (Engine::getSong()->projectFileName() != "" &&
+			ConfigManager::inst()->value( "ui", "enableversionedautosave" ).toInt())
+		{
+			QString currentProjectName = Engine::getSong()->projectFileName();
+			QString autoSaveTimestamp = QDateTime::currentDateTime().toString("dd-MM-yyyy-hh-mm-ss");
+			QString autoSaveVersionedName = currentProjectName.section('.', 0, 0).append(".autosave.")	//filename.autosave.
+											.append(autoSaveTimestamp).append(".")						//timestamp.
+											.append(currentProjectName.section('.', -1));				//extension
+
+			Engine::getSong()->saveProjectFile(autoSaveVersionedName);
+		}
+		Engine::getSong()->setModifiedAutosave(false);
 		autoSaveTimerReset();  // Reset timer
 	}
 	else
@@ -1473,7 +1488,6 @@ void MainWindow::exportProject(bool multiExport)
 	if( efd.exec() == QDialog::Accepted && !efd.selectedFiles().isEmpty() &&
 					 !efd.selectedFiles()[0].isEmpty() )
 	{
-
 		QString exportFileName = efd.selectedFiles()[0];
 		if ( !multiExport )
 		{

src/gui/modals/SetupDialog.cpp

@@ -130,6 +130,8 @@ SetupDialog::SetupDialog(ConfigTab tab_to_open) :
 			"ui", "enableautosave", "1").toInt()),
 	m_enableRunningAutoSave(ConfigManager::inst()->value(
 			"ui", "enablerunningautosave", "0").toInt()),
+	m_enableVersionedAutoSave(ConfigManager::inst()->value(
+			"ui", "enableversionedautosave", "0").toInt()),
 	m_smoothScroll(ConfigManager::inst()->value(
 			"ui", "smoothscroll").toInt()),
 	m_animateAFP(ConfigManager::inst()->value(
@@ -400,8 +402,12 @@ SetupDialog::SetupDialog(ConfigTab tab_to_open) :
 	m_runningAutoSave = addCheckBox(tr("Allow autosave while playing"), autoSaveBox, autoSaveLayout,
 		m_enableRunningAutoSave, SLOT(toggleRunningAutoSave(bool)), false);
 
+	m_versionedAutoSave = addCheckBox(tr("Create timestamped autosaves"), autoSaveBox, autoSaveLayout,
+		m_enableVersionedAutoSave, SLOT(toggleVersionedAutoSave(bool)), false);
+
 	m_saveIntervalSlider->setEnabled(m_enableAutoSave);
 	m_runningAutoSave->setVisible(m_enableAutoSave);
+	m_versionedAutoSave->setVisible(m_enableAutoSave);
 
 
 	// UI effect vs. performance tab.
@@ -998,6 +1004,8 @@ void SetupDialog::accept()
 					QString::number(m_enableAutoSave));
 	ConfigManager::inst()->setValue("ui", "enablerunningautosave",
 					QString::number(m_enableRunningAutoSave));
+	ConfigManager::inst()->setValue("ui", "enableversionedautosave",
+					QString::number(m_enableVersionedAutoSave));
 	ConfigManager::inst()->setValue("ui", "smoothscroll",
 					QString::number(m_smoothScroll));
 	ConfigManager::inst()->setValue("ui", "animateafp",
@@ -1166,6 +1174,7 @@ void SetupDialog::toggleAutoSave(bool enabled)
 	m_enableAutoSave = enabled;
 	m_saveIntervalSlider->setEnabled(enabled);
 	m_runningAutoSave->setVisible(enabled);
+	m_versionedAutoSave->setVisible(enabled);
 	setAutoSaveInterval(m_saveIntervalSlider->value());
 }
 
@@ -1175,12 +1184,18 @@ void SetupDialog::toggleRunningAutoSave(bool enabled)
 	m_enableRunningAutoSave = enabled;
 }
 
+void SetupDialog::toggleVersionedAutoSave(bool enabled)
+{
+	m_enableVersionedAutoSave = enabled;
+}
+
 
 void SetupDialog::resetAutoSave()
 {
 	setAutoSaveInterval(MainWindow::DEFAULT_SAVE_INTERVAL_MINUTES);
 	m_autoSave->setChecked(true);
 	m_runningAutoSave->setChecked(false);
+	m_versionedAutoSave->setChecked(false);
 }