krambuhl/Struck

Struck.computed = (function () {
  function Computed() {
      var self = this;

    self.props = splitName(_.flatten(_.initial(arguments)));
    self.func = _.last(arguments);
    
    var setup = _.once(setupListeners);

    return function() {
        _.bind(setup, undefined, self, this)();

        if (!self.cached) {
                self.cached = self.func.apply(this);
        }

        return self.cached;
        };
  }

  function setupListeners(comp, obj) {
      _.each(comp.props, function(property) {
          obj.listenTo('set:' + property, function() {
              comp.cached = comp.func.apply(obj);
          });
      });
  }

  return Computed;
})();