def is_incomplete_argument(current_params, cmd_param):
    """
    :param current_params: the current params and values for this argument as already entered
    :param cmd_param: the current command parameter
    :return: whether or not the last argument is incomplete and corresponds to this cmd_param. In
    other words whether or not the this cmd_param argument can still accept values
    """
    if not isinstance(cmd_param, Argument):
        return False
    current_param_values = current_params[cmd_param.name]
    if current_param_values is None:
        return True
    if cmd_param.nargs == -1:
        return True
    if isinstance(current_param_values, abc.Iterable) \
            and cmd_param.nargs > 1 and len(current_param_values) < cmd_param.nargs:
        return True
    return False