How to use the ghstack.submit.main function in ghstack

def gh(self, msg: str = 'Update',
           update_fields: bool = False,
           short: bool = False,
           no_skip: bool = False) -> List[ghstack.submit.DiffMeta]:
        return ghstack.submit.main(
            msg=msg,
            username='ezyang',
            github=self.github,
            sh=self.sh,
            update_fields=update_fields,
            stack_header='Stack',
            repo_owner='pytorch',
            repo_name='pytorch',
            short=short,
            no_skip=no_skip)

args.cmd = 'submit'

    with ghstack.logging.manager(debug=args.debug):

        sh = ghstack.shell.Shell()
        conf = ghstack.config.read_config()
        ghstack.logging.formatter.redact(conf.github_oauth, '')
        github = ghstack.github_real.RealGitHubEndpoint(
            oauth_token=conf.github_oauth,
            proxy=conf.proxy
        )

        if args.cmd == 'rage':
            ghstack.rage.main(latest=args.latest)
        elif args.cmd == 'submit':
            ghstack.submit.main(
                msg=args.message,
                username=conf.github_username,
                sh=sh,
                github=github,
                update_fields=args.update_fields,
                short=args.short,
                force=args.force,
                no_skip=args.no_skip,
            )
        elif args.cmd == 'unlink':
            ghstack.unlink.main(
                commits=args.COMMITS,
                sh=sh,
            )
        elif args.cmd == 'land':
            ghstack.land.main(