Easy function decorator in Coffeescript

decorator.coffee

extendStart = (func)->
 func ?= ()->

Function::extendEnd = (args...)=>

exemple.coffee

###
* Exemple de "décoration" de fonction d'autocompletion de Drupal 7
* /!\ C'est comme les galipeurs, j'ai pas testé, c'est pas garanti de marcher,
* mais en théorie ça le devrait !
*
* Pour ceux qui ne lisent pas le Coffeescript -> http://jashkenas.github.com/coffee-script/#try:%23%23%23%0A*%20Exemple%20de%20%22d%C3%A9coration%22%20de%20fonction%20d%27autocompletion%20de%20Drupal%207%0A%23%23%23%0A%28%28%24%29-%3E%0A%0A%20%20extendStart%20%3D%20%28func%29-%3E%0A%20%20%20%20func%20%3F%3D%20%28%29-%3E%0A%0A%20%20Function%3A%3AextendEnd%20%3D%20%28args...%29%3D%3E%0A%0A%20%20original_autocomplete%20%3D%20extendStart%20Drupal.behaviors.autocomplete.attach%0A%0A%20%20Drupal.behaviors.autocomplete.attach%20%3D%20%28context%2C%20settings%29-%3E%0A%20%20%20%20%23%20Traitement%20ici%0A%20%20%20%20original_autocomplete.extendEnd%20context%2C%20settings%0A%20%0A%0A%29.call%20window%2C%20jQuery
###

(($)->

  extendStart = (func)->
    func ?= ()->

  Function::extendEnd = (args...)=>

  original_autocomplete = extendStart Drupal.behaviors.autocomplete.attach

  Drupal.behaviors.autocomplete.attach = (context, settings)->
    # Traitement ici
    original_autocomplete.extendEnd context, settings
 

).call window, jQuery

Does not work anymore 😢