indent.go

package text

// Indent inserts prefix at the beginning of each non-empty line of s. The
// end-of-line marker is NL.
func Indent(s, prefix string) string {
	return string(IndentBytes([]byte(s), []byte(prefix)))
}

// IndentBytes inserts prefix at the beginning of each non-empty line of b.
// The end-of-line marker is NL.
func IndentBytes(b, prefix []byte) []byte {
	var res []byte
	bol := true
	for _, c := range b {
		if bol && c != '\n' {
			res = append(res, prefix...)
		}
		res = append(res, c)
		bol = c == '\n'
	}
	return res
}