class Application(Gtk.Application):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, application_id="org.example.myapp",
                         flags=Gio.ApplicationFlags.HANDLES_COMMAND_LINE,
                         **kwargs)
        self.window = None
        self.add_main_option("test", ord("t"), GLib.OptionFlags.NONE,
                             GLib.OptionArg.NONE, "Command line test", None)

    def do_startup(self):
        Gtk.Application.do_startup(self)
        action = Gio.SimpleAction.new("quit", None)
        action.connect("activate", self.on_quit)
        self.add_action(action)

    def do_activate(self):
        # We only allow a single window and raise any existing ones
        if not self.window:
            # Windows are associated with the application
            # when the last one is closed the application shuts down
            self.window = AppWindow(application=self, title="Main Window")
        self.window.present()

    def do_command_line(self, command_line):
        options = command_line.get_options_dict()
        if options.contains("test"):
            # This is printed on the main instance
            print("Test argument recieved")
        self.activate()
        return 0