2 var stringWidth = require('string-width')
3 var stripAnsi = require('strip-ansi')
5 module.exports = wideTruncate
7 function wideTruncate (str, target) {
8 if (stringWidth(str) === 0) return str
9 if (target <= 0) return ''
10 if (stringWidth(str) <= target) return str
12 // We compute the number of bytes of ansi sequences here and add
13 // that to our initial truncation to ensure that we don't slice one
14 // that we want to keep in half.
15 var noAnsi = stripAnsi(str)
16 var ansiSize = str.length + noAnsi.length
17 var truncated = str.slice(0, target + ansiSize)
19 // we have to shrink the result to account for our ansi sequence buffer
20 // (if an ansi sequence was truncated) and double width characters.
21 while (stringWidth(truncated) > target) {
22 truncated = truncated.slice(0, -1)