gui: mainwindow: Add checkbox to remove current database

gui/mainwindow.cpp

@@ -408,6 +408,17 @@ void MainWindow::initSettingsTabs()
 
 void MainWindow::saveSettings()
 {
+	if(ui->chkRemoveOldDb->isChecked())
+	{
+		bool result = QFile::remove(Common::databasePath());
+		if(!result)
+		{
+			QMessageBox::critical(this, "Error removing database",
+								  "Failed to remove old database. Settings not saved.");
+			return;
+		}
+	}
+
 	QSettings settings;
 
 	QString pdfViewerCmd = ui->txtSettingPdfPreviewerCmd->text();

gui/mainwindow.ui

@@ -532,6 +532,13 @@
            <item>
             <widget class="QLineEdit" name="txtSettingDatabasePath"/>
            </item>
+           <item>
+            <widget class="QCheckBox" name="chkRemoveOldDb">
+             <property name="text">
+              <string>Remove old database on save</string>
+             </property>
+            </widget>
+           </item>
           </layout>
          </widget>
         </item>