coffeescript version of thie highly configurable plugin pattern - http://markdalgleish.com/2011/05/creating-highly-configurable-jquery-plugins/

plugin-pattern.js.coffee

  class Plugin
    constructor: (elem, options) ->
      @elem = elem
      @$elem = $(elem)
      @options = options
      @metadata = @$elem.data('plugin-options')
      @

    defaults: 
      message: 'Hello world!'

    init: ->
      @config = $.extend {}, @defaults, @options, @metadata
      @displayMessage()
      @

    displayMessage: ->
      alert @config.message
    
  Plugin.defaults = Plugin.prototype.defaults;

  $.fn.plugin = (options) ->
    @each ->
      (new Plugin @, options).init()

  window.Plugin = Plugin