AngularJS route builder that avoid declaration duplication

routes.coffee

_build = (callback) ->
  string = callback.toString()
  mathes = string.match /function\s?\(([\w,\s?\$]+)\)\s?\{/
  arr = mathes[1].split(', ')
  arr.push callback
  return arr

# using AngularUI Router
angular.module('app').config ($stateProvider) ->
  
  # before
  $stateProvider.state 'app.old',
    controller: ['$state', '$stateParams', 'MyService', ($state, $stateParams, MyService) ->
      MyService.do()
    ]
  
  # after    
  $stateProvider.state 'app',
    controller: _build ($state, $stateParams, MyService) ->
      MyService.do()