Add view.

src/Silex/Application.php

@@ -18,6 +18,7 @@ use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\TerminableInterface;
 use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
 use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;
 use Symfony\Component\HttpKernel\Event\PostResponseEvent;
 use Symfony\Component\HttpKernel\EventListener\ResponseListener;
 use Symfony\Component\HttpKernel\EventListener\RouterListener;
@@ -404,6 +405,28 @@ class Application extends \Pimple implements HttpKernelInterface, TerminableInte
         $this->on(KernelEvents::EXCEPTION, new ExceptionListenerWrapper($this, $callback), $priority);
     }
 
+    /**
+     * Registers a view handler.
+     *
+     * View handlers are simple callables which take a single
+     * GetResponseForControllerResultEvent as an argument. They care called
+     * when a controller returns a value that is not an instance of Response.
+     *
+     * Call setResponse() to set the response that will be returned for the
+     * current request. The propagation of this event is stopped as soon as a
+     * response is set.
+     *
+     * @param mixed   $callback View handelr callback
+     * @param integer $priority The higher this value, the earlier an event
+     *                          listener will be triggered in the chain (defaults to 0)
+     */
+    public function view($callback, $priority = 0)
+    {
+        $this->on(KernelEvents::VIEW, function (GetResponseForControllerResultEvent $event) use ($callback) {
+            call_user_func($callback, $event);
+        }, $priority);
+    }
+
     /**
      * Flushes the controller collection.
      *

tests/Silex/Tests/ApplicationTest.php

@@ -559,6 +559,72 @@ class ApplicationTest extends \PHPUnit_Framework_TestCase
         $response = $app->handle(Request::create('/foo'));
         $this->assertEquals(301, $response->getStatusCode());
     }
+
+    public function testBeforeFilterOnMountedControllerGroupIsolatedToGroup()
+    {
+        $app = new Application();
+        $app->match('/', function() { return new Response('ok'); });
+        $mounted = $app['controllers_factory'];
+        $mounted->before(function() { return new Response('not ok'); });
+        $app->mount('/group', $mounted);
+
+        $response = $app->handle(Request::create('/'));
+        $this->assertEquals('ok', $response->getContent());
+    }
+
+    public function testViewListener()
+    {
+        $app = new Application();
+        $app->get('/foo', function() { return array('ok'); });
+        $app->view(function ($event) {
+            $view = $event->getControllerResult();
+
+            $event->setResponse(new Response($view[0]));
+        });
+
+        $response = $app->handle(Request::create('/foo'));
+
+        $this->assertEquals('ok', $response->getContent());
+    }
+
+    public function testDefaultPriorityStringResponseTriggerViewListener()
+    {
+        $app = new Application();
+        $app->get('/foo', function() { return 'not ok'; });
+        $app->view(function ($event) {
+            $event->setResponse(new Response('ok'));
+        });
+
+        $response = $app->handle(Request::create('/foo'));
+
+        $this->assertEquals('ok', $response->getContent());
+    }
+
+    public function testLowPriorityStringResponseDoesNotTriggerViewListener()
+    {
+        $app = new Application();
+        $app->get('/foo', function() { return 'ok'; });
+        $app->view(function ($event) {
+            $event->setResponse(new Response('not ok'));
+        }, -100);
+
+        $response = $app->handle(Request::create('/foo'));
+
+        $this->assertEquals('ok', $response->getContent());
+    }
+
+    public function testResponseInstanceResponseDoesNotTriggerViewListener()
+    {
+        $app = new Application();
+        $app->get('/foo', function() { return new Response('ok'); });
+        $app->view(function ($event) {
+            $event->setResponse(new Response('not ok'));
+        });
+
+        $response = $app->handle(Request::create('/foo'));
+
+        $this->assertEquals('ok', $response->getContent());
+    }
 }
 
 class FooController