columnwidth.go

func columnWidth(s string) int {
	runes := []rune(s)
	w := 0
	for _, r := range runes {
		k := width.LookupRune(r).Kind()
		if k == width.EastAsianWide || k == width.EastAsianFullwidth {
			w = w + 2
		} else {
			w = w + 1
		}
	}
	return w
}