1'use strict'
2var stringWidth = require('string-width')
3var stripAnsi = require('strip-ansi')
4
5module.exports = wideTruncate
6
7function wideTruncate (str, target) {
8  if (stringWidth(str) === 0) {
9    return str
10  }
11  if (target <= 0) {
12    return ''
13  }
14  if (stringWidth(str) <= target) {
15    return str
16  }
17
18  // We compute the number of bytes of ansi sequences here and add
19  // that to our initial truncation to ensure that we don't slice one
20  // that we want to keep in half.
21  var noAnsi = stripAnsi(str)
22  var ansiSize = str.length + noAnsi.length
23  var truncated = str.slice(0, target + ansiSize)
24
25  // we have to shrink the result to account for our ansi sequence buffer
26  // (if an ansi sequence was truncated) and double width characters.
27  while (stringWidth(truncated) > target) {
28    truncated = truncated.slice(0, -1)
29  }
30  return truncated
31}
32