gistfile1.go

// trunecateString trunecates a string up to a maximum of length characters.
func truncateString(s string, length int) string {
	l := utf8.RuneCountInString(s)
	if l < length {
		length = l
	}
	out := make([]string, length)
	var ch rune
	var size int
	i, curr := 0, 0
	for ; i < length; i++ {
		ch, size = utf8.DecodeRuneInString(s[curr:])
		if ch == utf8.RuneError {
			out[i] = string(utf8.RuneError)
		} else {
			out[i] = s[curr : curr+size]
		}
		curr += size
	}
	return strings.Join(out, "")
}