/*

MIT License http://www.opensource.org/licenses/mit-license.php

Author Tobias Koppers @sokra

*/

var path = require("path");

module.exports = function(cwd) {

var cwd = cwd;

var cwdParent = path.dirname(cwd);

var buildins = path.join(__dirname, "..");

cwd = cwd.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");

cwd = new RegExp("^" + cwd + "|(!)" + cwd, "g");

var buildinsAsModule = cwd.test(buildins);

cwdParent = cwdParent.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");

cwdParent = new RegExp("^" + cwdParent + "|(!)" + cwdParent, "g");

buildins = buildins.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");

buildins = new RegExp("^" + buildins + "|(!)" + buildins, "g");

var node_modulesRegExpA = /\/node_modules\//g;

var node_modulesRegExpB = /\\node_modules\\/g;

var index_jsRegExp = /[\\\/]index.js!/g;

function compressFilename(filename) {

if(!filename)

return filename;

if(buildinsAsModule)

filename = filename.replace(buildins, "!(webpack)");

filename = filename.replace(cwd, "!.");

if(!buildinsAsModule)

filename = filename.replace(buildins, "!(webpack)");

filename = filename.replace(node_modulesRegExpA, "/~/");

filename = filename.replace(node_modulesRegExpB, "\\~\\");

filename = filename.replace(index_jsRegExp, "!");

return filename.replace(/^!|!$/, "");

}

return compressFilename;

}