var app = angular.module('app', []);

​

​

app.directive('derp', function () {

  return {

    restrict: 'A',

    controller: function ($scope) {

      $scope.logIt = function () {

        console.log('original ctrl');

      };

      $scope.logIt();

    },

    link: function (scope, el, attrs) {

      el.html('hai');

    }

  };

});

​

app.config(function ($provide) {

  $provide.decorator('derpDirective', function ($delegate, $controller) {

    var dir = $delegate[0];

    var origCtrl = dir.controller;

    dir.controller = function ($scope, $element, $attrs, $timeout) {

      var ctrl = $controller(origCtrl, { $scope: $scope });

      $scope.logLater = function () {

        $timeout(function () {

          console.log('log later');

          $element.html('bai');

        }, 1500);

      };

      $scope.logLater();

      return ctrl;

    };

    return $delegate;

  });

});