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truncate.go
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63 lines (55 loc) · 1.02 KB
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package text
import (
"golang.org/x/text/width"
)
// DisplayWidth calculates what the rendered width of a string may be
func DisplayWidth(s string) int {
w := 0
for _, r := range s {
w += runeDisplayWidth(r)
}
return w
}
const (
ellipsisWidth = 3
minWidthForEllipsis = 5
)
// Truncate shortens a string to fit the maximum display width
func Truncate(max int, s string) string {
w := DisplayWidth(s)
if w <= max {
return s
}
useEllipsis := false
if max >= minWidthForEllipsis {
useEllipsis = true
max -= ellipsisWidth
}
cw := 0
ri := 0
for _, r := range s {
rw := runeDisplayWidth(r)
if cw+rw > max {
break
}
cw += rw
ri++
}
res := string([]rune(s)[:ri])
if useEllipsis {
res += "..."
}
if cw < max {
// compensate if truncating a wide character left an odd space
res += " "
}
return res
}
func runeDisplayWidth(r rune) int {
switch width.LookupRune(r).Kind() {
case width.EastAsianWide, width.EastAsianAmbiguous, width.EastAsianFullwidth:
return 2
default:
return 1
}
}