another version of gulp with duo

duo-2-gulpfile.js

var duo = require('duo');  // https://github.com/duojs/duo
var map = require('map-stream');  // https://github.com/dominictarr/map-stream
 
 
var paths = {
  build: {
    src: {
      jsApp: ['./src/js/main.js'],
      jsClient: ['./src/js/client.js']
    },
    dest: {
      js: './src'
    }
  }
};
 
 
gulp.task('js-build', function () {
  gulp.src(paths.build.src.jsApp)
    .pipe(duoify())
    .pipe(gulp.dest(paths.build.dest.js));
 
  gulp.src(paths.build.src.jsClient)
    .pipe(duoify())
    .pipe(gulp.dest(paths.build.dest.js));
});
 
 
function duoify(opts) {
  opts = opts || {};
 
  return map(function (file, cb) {
    duo(__dirname)
      .entry(file.path)
      .run(function (err, src) {
        if (err) {
          return cb(err);
        }
 
        file.contents = new Buffer(src);
        cb(null, file);
      });
  });
}