Gulp environment config

env-config.js

gulp.task('config', function () {
  var parser = new xml2js.Parser();
  var builder = new xml2js.Builder({
    renderOpts: {
      pretty: true,
      indent: '    '
    },
    xmldec: {
      version: '1.0',
      encoding: 'utf-8'
    }
  });
  // read & parse file
  var xmlFile = fs.readFileSync('config.xml');
  parser.parseString(xmlFile, function (err, result) {
    // get values
    if (options.getWidgetAttr) {
      console.log(result.widget.$[options.getWidgetAttr]);
    }
    // update values
    if (options.setWidgetAttr) {
      var split = options.setWidgetAttr.split('=');
      var key = split[0];
      var value = split[1];
      result.widget.$[key] = value;
    }

    if (options.setName) {
      result.widget.name = options.setName;
    }
    if (options.setDescription) {
      result.widget.description = options.setDescription;
    }
    if (options.setAuthor) {
      var splits = options.setAuthor.split('---');
      if (splits[0]) {
        result.widget.author[0]._ = splits[0];
      }
      if (splits[1]) {
        result.widget.author[0].$.email = splits[1];
      }
      if (splits[2]) {
        result.widget.author[0].$.href = splits[2];
      }
    }
    // write file
    var xml = builder.buildObject(result);
    fs.writeFileSync('config.xml', xml);
  });
});