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) return str 9 if (target <= 0) return '' 10 if (stringWidth(str) <= target) return str 11 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) 18 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) 23 } 24 return truncated 25} 26