Function charWidth

cli/command/formatter/displayutils.go:20–29

charWidth returns the number of horizontal positions a character occupies, and is used to account for wide characters when displaying strings. In a broad sense, wide characters include East Asian Wide, East Asian Full-width, (when not in East Asian context) see http://unicode.org/reports/tr11/.

(r rune)

// In a broad sense, wide characters include East Asian Wide, East Asian Full-width,
// (when not in East Asian context) see http://unicode.org/reports/tr11/.
func charWidth(r rune) int {
	switch width.LookupRune(r).Kind() {
	case width.EastAsianWide, width.EastAsianFullwidth:
		return 2
	case width.Neutral, width.EastAsianAmbiguous, width.EastAsianNarrow, width.EastAsianHalfwidth:
		return 1
	default:
		return 1
	}
}

// TruncateID returns a shorthand version of a string identifier for presentation,
// after trimming digest algorithm prefix (if any).