How to use the hupper.start_reloader function in hupper

kw['monitor_factory'] = lambda cb: PollingFileMonitor(cb, **pkw)

        if opts.watchdog:
            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

"""Serve up specified SQLite database files with a web UI"""
    if help_config:
        formatter = formatting.HelpFormatter()
        with formatter.section("Config options"):
            formatter.write_dl(
                [
                    (option.name, "{} (default={})".format(option.help, option.default))
                    for option in CONFIG_OPTIONS
                ]
            )
        click.echo(formatter.getvalue())
        sys.exit(0)
    if reload:
        import hupper

        reloader = hupper.start_reloader("datasette.cli.serve")
        reloader.watch_files(files)
        if metadata:
            reloader.watch_files([metadata.name])

    inspect_data = None
    if inspect_file:
        inspect_data = json.load(open(inspect_file))

    metadata_data = None
    if metadata:
        metadata_data = json.loads(metadata.read())

    click.echo(
        "Serve! files={} (immutables={}) on port {}".format(files, immutable, port)
    )
    ds = Datasette(

def serve(dbs, host, port, debug, reload, cache, max_workers, parse_module):
    if reload:
        import hupper
        hupper.start_reloader('csvapi.cli.serve')
    app.config.DB_ROOT_DIR = dbs
    app.config.CSV_CACHE_ENABLED = cache
    app.config.MAX_WORKERS = max_workers
    app.config.RESPONSE_TIMEOUT = RESPONSE_TIMEOUT
    app.config.PARSE_MODULE = parse_module
    app.run(host=host, port=port, debug=debug)