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'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) {
if (typeof pattern === 'function') {
return arrayUnion(ret, list.filter(pattern));
} else if (pattern instanceof RegExp) {
return arrayUnion(ret, list.filter(function(item) {
return pattern.test(item);
}));
} else {
var process = arrayUnion;
if (pattern[0] === '!') {
pattern = pattern.slice(1);
process = arrayDiffer;
}
return process(ret, minimatch.match(list, pattern, options));
}
}, []);
};
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