package flag

func isShort(e string) bool {
	re := []rune(e)

	return e != "--" && len(re) == 2 && re[0] == '-'
}

func isLong(e string) bool {
	return len(e) > 2 && e[:2] == "--"
}

func isCombined(e string) bool {
	re := []rune(e)

	return len(re) > 2 && re[0] != '-'
}

func isUnixFlag(e string) bool {
	return isShort(e) || isLong(e)
}

func formatArg(e string) []string {
	if isCombined(e) {
		var out []string
		for _, r := range e[1:] {
			out = append(out, string([]rune{'-', r}))
		}
		return out
	}

	return []string{e}
}

func formatArgs(args []string) []string {
	var (
		out    []string
		ignore bool
	)

	for _, e := range args {
		if ignore {
			out = append(out, e)
		} else {
			ignore = e == "--"
			out = append(out, formatArg(e)...)
		}
	}

	return out
}

func containsUnixFlag(args []string) bool {
	for _, arg := range args {
		if isUnixFlag(arg) {
			return true
		}
	}

	return false
}