How to use the hupper.get_reloader function in hupper

from hupper.watchdog import WatchdogFileMonitor

            kw['monitor_factory'] = WatchdogFileMonitor

        if opts.watchman:
            from hupper.watchman import WatchmanFileMonitor

            kw['monitor_factory'] = WatchmanFileMonitor

        if opts.reload_interval:
            kw['reload_interval'] = opts.reload_interval

        hupper.start_reloader(__name__ + '.main', **kw)

    if hupper.is_active():
        hupper.get_reloader().watch_files([os.path.join(here, 'foo.ini')])
        hupper.get_reloader().watch_files(opts.watch_files)

    if opts.callback_file:
        with open(opts.callback_file, 'ab') as fp:
            fp.write('{:d}\n'.format(int(time.time())).encode('utf8'))
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        pass

def register() -> None:
        if hupper.is_active():  # pragma: no cover
            hupper.get_reloader().watch_files([filepath])
        spec_dict = read_yaml_file(filepath)

        validate_spec(spec_dict)
        spec = create_spec(spec_dict)

        def spec_view(request: Request) -> FileResponse:
            return FileResponse(filepath, request=request, content_type="text/yaml")

        config.add_route(route_name, route)
        config.add_view(route_name=route_name, view=spec_view)

        custom_formatters = config.registry.settings.get("pyramid_openapi3_formatters")

        config.registry.settings["pyramid_openapi3"] = {
            "filepath": filepath,
            "spec_route_name": route_name,

if opts.reload and not hupper.is_active():
            if self.verbose > 1:
                self.out('Running reloading file monitor')
            reloader = hupper.reloader.Reloader(
                worker_path='gearbox.main.main',
                reload_interval=opts.reload_interval,
                monitor_factory=hupper.reloader.find_default_monitor_factory(
                    logging.getLogger('gearbox')
                ),
                logger=logging.getLogger('gearbox'),
            )
            reloader.run()

        if hupper.is_active():
            # Tack also config file changes
            hupper.get_reloader().watch_files([opts.config_file])

        if cmd == 'restart' or cmd == 'stop':
            result = self.stop_daemon(opts)
            if result:
                if cmd == 'restart':
                    self.out("Could not stop daemon; aborting")
                else:
                    self.out("Could not stop daemon")
                return result
            if cmd == 'stop':
                return result
            opts.daemon = True

        if cmd == 'start':
            opts.daemon = True