Gulp Compiler Helpers

Polymer Cache bust for dev

/*
Based on Cachebust
Fixes issue where the original cachebust doesn't see custom polymer elements. Ignores bower_components where polymer elements reside which will cause polymer issues.
*/
 var $ = require('cheerio'),
 MD5 = require('MD5');

 exports.busted = function(fileContents, options) {

    /* For elements in Polymer. Since Polymer
     *  doesn't use body or head tags (the $styles tag doesn't catch it) */
    var contents = $.load(fileContents);
    var links = contents("link");
    for (i = 0; i < links.length; i++) {
      var href = links[i].attribs.href;

      if ( href.indexOf("?t=") === -1 && href.indexOf("bower_components") === -1) {

        if (options.type === 'timestamp') {
              fileContents = fileContents.replace(href, href + '?t=' + timestamp);
        } else if (options.type === 'hash') {
              fileContents = fileContents.replace(href, href + '?hash=' + MD5(fileContents));
        } else {
              fileContents = fileContents.replace(href, href + '?cbust=' + options.id);
        }

      }

    }

    return fileContents;
  };