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cli/command/formatter/displayutils.go
61 строка
1 KB
Chao Wang
Refactor stringutils and fix docker search output form when the description has CJK character
27 окт 2017, 06:15
27 окт 2017, 06:15
926b20f
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package formatter import ( "unicode/utf8" "golang.org/x/text/width" ) // 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/. func charWidth(r rune) int { switch width.LookupRune(r).Kind() { case width.EastAsianWide, width.EastAsianFullwidth: return 2 default: return 1 } } // Ellipsis truncates a string to fit within maxDisplayWidth, and appends ellipsis (…). // For maxDisplayWidth of 1 and lower, no ellipsis is appended. // For maxDisplayWidth of 1, first char of string will return even if its width > 1. func Ellipsis(s string, maxDisplayWidth int) string { if maxDisplayWidth <= 0 { return "" } rs := []rune(s) if maxDisplayWidth == 1 { return string(rs[0]) } byteLen := len(s) if byteLen == utf8.RuneCountInString(s) { if byteLen <= maxDisplayWidth { return s } return string(rs[:maxDisplayWidth-1]) + "…" } var ( display []int displayWidth int ) for _, r := range rs { cw := charWidth(r) displayWidth += cw display = append(display, displayWidth) } if displayWidth <= maxDisplayWidth { return s } for i := range display { if display[i] <= maxDisplayWidth-1 && display[i+1] > maxDisplayWidth-1 { return string(rs[:i+1]) + "…" } } return s }