package urlutil

import (
	"path"
	"strings"
)

// ShiftPath splits off the first component of p, which will be cleaned of
// relative components before processing. head will never contain a slash and
// tail will always be a rooted path without trailing slash.
//
// See: https://blog.merovius.de/posts/2017-06-18-how-not-to-use-an-http-router/
func ShiftPath(p string) (head, tail string) {
	p = path.Clean("/" + p)

	i := strings.Index(p[1:], "/") + 1
	if i <= 0 {
		return p[1:], "/"
	}

	return p[1:i], p[i:]
}