bundler.js

var fs = require('fs');
var through = require('through');
var browserify = require('browserify');
var exorcist = require('exorcist');

function fixGherkinLexers(file) {
  var data = '';

  function write (buf) { data += buf; }

  function end () {
    var path = __dirname + '/node_modules/gherkin/lib';
    var lexersPath = path + '/gherkin/lexer';
    if (file === path + '/gherkin.js') {
      // Patch gherkin so that all lexers are available statically:
      var bufferPrefix = '';
      var dirFiles = fs.readdirSync(lexersPath);
      dirFiles.forEach(function (dirFile) {
        var matches = dirFile.match(/^(.*)\.js$/);
        if (matches && !dirFile.match(/\.min\.js$/)) {
          bufferPrefix += 'require("./gherkin/lexer/' + matches[1] + '");\n';
        }
      });
      data = bufferPrefix + data;
    }
    var ignoredFiles = [
      __dirname + '/lib/cucumber/cli.js'
    ];
    if (ignoredFiles.indexOf(file) > -1) {
      data = '';
    }
    this.queue(data);
    this.queue(null);
  }

  return through(write, end);
}

function Bundler(bundlePath) {
  var mapPath = bundlePath + '.map';

  var self = {
    bundle: function (callback) {
      var _callback = callback;
      callback = function (err) {
        if (_callback) _callback(err);
        _callback = null;
      };

      var operation = browserify({debug: true, standalone: 'Cucumber'})
          .transform({global: true}, fixGherkinLexers)
          .transform({global:true}, 'uglifyify')
          .exclude('./lib/cucumber/cli') // TODO: doesn't work, fix this
          .require('./bundle-main', { expose: 'cucumber' })
          .bundle()
          .pipe(exorcist(mapPath))
          .pipe(fs.createWriteStream(bundlePath, 'utf8'));

      operation.on('error', function (err) {
        callback(err);
      });

      operation.on('finish', function () {
        callback();
      });
    }
  };

  return self;
}

module.exports = Bundler;