x.js

var uglifyJS = require('uglify-js');
var src = require('glob-stream').create;
var watch = require('glob-watcher');
var through = require('through');
var fs = require('fs');
var path = require('path');

// uglify -.- wtf. make stream kind of.
function uglify(fileName) {
  var stream = through()
  
  fs.readFile(fileName, function (err, file) {
    if (err) {
      return stream.emit('error', err)
    }

    var payload

    try {
      payload = uglifyJS.minify(String(file), { fromString: true }).code
    } catch (err) {
      return stream.emit('error', err)
    }

    stream.end(payload)
  })

  return stream
}


function dest(baseDir) {
  return through(function (file) {
    file.contents.pipe(fs.createWriteStream(
      path.join(baseDir, path.filename(file.path))
    ))
  })
}

var tasks = {
  'scripts': function () {
    src(['client/js/**/*.js', '!client/js/vendor/**'])
      .pipe(through(function (file) {
        return { contents: uglify(file.path), path: file.path };
      }))
      .pipe(dest('build/js'))

    src('client/js/vendor/**')
      .pipe(dest('build/js/vendor'))
  },
  'copy': function () {
    src('client/img/**')
      .pipe(dest('build/img'))

    src('client/css/**')
      .pipe(dest('build/css'))

    src('client/*.html')
      .pipe(dest('build'))
  },
  'default': function () {
    tasks.scripts()
    tasks.copy()

    watch('client/js/**', tasks.scripts)

    watch([
      'client/img/**',
      'client/css/**',
      'client/*.html'
    ], tasks.copy)
  }
}

var cmd = process.argv[3] || 'default';
tasks[cmd]();