'use strict'; var minimatch = require('minimatch'); var arrayUnion = require('array-union'); var arrayDiffer = require('array-differ'); var arrify = require('arrify'); module.exports = function (list, patterns, options) { list = arrify(list); patterns = arrify(patterns); if (list.length === 0 || patterns.length === 0) { return []; } options = options || {}; return patterns.reduce(function (ret, pattern) { var process = arrayUnion; if (pattern[0] === '!') { pattern = pattern.slice(1); process = arrayDiffer; } return process(ret, minimatch.match(list, pattern, options)); }, []); };