cli.py

def _split_args(f):
    @wraps(f)
    def dispatch(parsed_args, *args, **kwargs):
        parsed_args = vars(parsed_args)
        parsed_args.pop('_functions_stack', None)
        return f(**parsed_args)
    return dispatch


def register_commands(functions, namespace=None, namespace_kwargs=None,
                 func_kwargs=None, title=None, description=None, help=None):
    to_add = []
    for function in functions:
        spec = inspect.getfullargspec(function)

        if 'app' in spec.args:
            function = _split_args(expects_obj(function))

        if not spec.defaults:
            defaults = {}
        else:
            defaults = dict(zip(
                spec.args[-len(spec.defaults):],
                spec.defaults))

        for argument in spec.args:
            if argument == 'app':
                continue

            kwargs = {}
            with suppress(KeyError):
                kwargs['default'] = defaults[argument]
                kwargs['nargs'] = '?'
            with suppress(KeyError):
                kwargs['help'] = spec.annotations[argument]
            function = arg(argument, **kwargs)(function)

        to_add.append(function)

    parser.add_commands(to_add, namespace=namespace)