Function splitPathOrOpaque

nix/flake/flakeref.go:515–540

splitPathOrOpaque splits a URL path by '/'. If the path is empty, it splits the opaque instead. Splitting happens before unescaping the path or opaque, ensuring that path elements with an encoded '/' (%2F) are not split. For example, "/dir/file%2Fname" becomes the elements "dir" and "file/name". The

(u *url.URL, n int)

// For example, "/dir/file%2Fname" becomes the elements "dir" and "file/name".
// The count limits the number of substrings per [strings.SplitN]
func splitPathOrOpaque(u *url.URL, n int) ([]string, error) {
	upath := u.EscapedPath()
	if upath == "" {
		upath = u.Opaque
	}
	upath = strings.TrimSpace(upath)
	if upath == "" {
		return nil, nil
	}

	// We don't want an empty element if the path is rooted.
	if upath[0] == '/' {
		upath = upath[1:]
	}
	upath = path.Clean(upath)

	var err error
	split := strings.SplitN(upath, "/", n)
	for i := range split {
		split[i], err = url.PathUnescape(split[i])
		if err != nil {
			return nil, err
		}
	}
	return split, nil
}

// buildEscapedPath escapes and joins path elements for a URL flake ref. The
// resulting path is cleaned according to url.JoinPath.