Loading an AngularJS controller dynamically

I’ve found a possible solution where I don’t need to know about the controller before bootstrapping:

// Make module Foo and store $controllerProvider in a global
var controllerProvider = null;
angular.module('Foo', [], function($controllerProvider) {
    controllerProvider = $controllerProvider;
});
// Bootstrap Foo
angular.bootstrap($('body'), ['Foo']);

// .. time passes ..

// Load javascript file with Ctrl controller
angular.module('Foo').controller('Ctrl', function($scope, $rootScope) {
    $scope.msg = "It works! rootScope is " + $rootScope.$id +
        ", should be " + $('body').scope().$id;
});
// Load html file with content that uses Ctrl controller
$('<div id="ctrl" ng-controller="Ctrl" ng-bind="msg">').appendTo('body');

// Register Ctrl controller manually
// If you can reference the controller function directly, just run:
// $controllerProvider.register(controllerName, controllerFunction);
// Note: I haven't found a way to get $controllerProvider at this stage
//    so I keep a reference from when I ran my module config
function registerController(moduleName, controllerName) {
    // Here I cannot get the controller function directly so I
    // need to loop through the module's _invokeQueue to get it
    var queue = angular.module(moduleName)._invokeQueue;
    for(var i=0;i<queue.length;i++) {
        var call = queue[i];
        if(call[0] == "$controllerProvider" &&
           call[1] == "register" &&
           call[2][0] == controllerName) {
            controllerProvider.register(controllerName, call[2][1]);
        }
    }
}
registerController("Foo", "Ctrl");
// compile the new element
$('body').injector().invoke(function($compile, $rootScope) {
    $compile($('#ctrl'))($rootScope);
    $rootScope.$apply();
});

Fiddle. Only problem is that you need to store the $controllerProvider and use it in a place where it really shouldn’t be used (after the bootstrap). Also there doesn’t seem to be an easy way to get at a function used to define a controller until it is registered, so I need to loop through the module’s _invokeQueue, which is undocumented.

UPDATE: To register directives and services, instead of $controllerProvider.register simply use $compileProvider.directive and $provide.factory respectively. Again, you’ll need to save references to these in your initial module config.

UDPATE 2: Here’s a fiddle which automatically registers all controllers/directives/services loaded without having to specify them individually.