Currently when we use -h or --help flag to print help message, it would add additional pflag: help requested to the end of message; or when some other errors occurred, it would print the error message twice (front and end).

It was caused by those codes,

And in go's official flag package, it would explicitly ignore the ErrHelp error.

switch f.errorHandling {
case ContinueOnError:
	return err
case ExitOnError:
	if err == ErrHelp {
		os.Exit(0)
	}
	os.Exit(2)
case PanicOnError:
	panic(err)
}

I don't know if this was some kind of bug, but a little fixes might be better.🤗