Invoke the command with standardized usage-help processing. Same
        calling convention as `Command.invoke()`, except here *args* is an
        un-parsed list of strings.

def invoke_with_usage (self, args, **kwargs):
        """Invoke the command with standardized usage-help processing. Same
        calling convention as `Command.invoke()`, except here *args* is an
        un-parsed list of strings.

        """
        ap = self.get_arg_parser (**kwargs)
        args = ap.parse_args (args)
        return self.invoke (args, **kwargs)