Replace PolymerElement bower components with their github equivalents

bower2git.js

#!/usr/bin/env node
/**
 * @license
 * Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 * Code distributed by Google as part of the polymer project is also
 * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */

var async = require('async');
var path = require('path');
var del = require('del');
var glob = require('glob');
var git = require('gift');

async.waterfall([
  // find all the bower metadata
  function(next) {
    glob('bower_components/*/.bower.json', next);
  },
  // generate replacement objects for elements
  function(files, next) {
    var replacements = [];
    files.forEach(function(file) {
      try {
        var json = require('./' + file);
        var source = json._originalSource;
        // only repos in PolymerElements
        if (source.split('/')[0].toLowerCase() !== 'polymerelements') {
          return;
        }
        // find the commit for the tag
        var commit = json._resolution.commit;
        // git repo
        var repo = json._source.replace('git://', 'https://');
        // folder in bower_comopnents
        var folder = path.dirname(file);
        replacements.push({
          repo: repo,
          commit: commit,
          folder: folder
        });
      } catch(_) {
      }
    });
    next(null, replacements);
  },
  function(replacements, next) {
    async.each(replacements, function(rep, cb) {
      console.log('swapping', rep.folder, 'with git version');
      async.series([
        // delete bower copy
        function(n) {
          del(rep.folder, n);
        },
        // clone git copy
        function(n) {
          git.clone(rep.repo, rep.folder, function(err, repo) {
            if (err) return n(err);
            // checkout tag
            repo.checkout(rep.commit, n);
          });
        }
      ], cb);
    }, next);
  },
], function(err) {
  if (err) {
    console.log(err);
  } else {
    console.log('DONE');
  }
});