In Silex, we can use an KernelEvents::VIEW eventlistener to catch the event that's triggered when a non Response object is returned by the controller. We can then fetch the controller from the request, generate a path to a view and render that. That way we can just return an array() in the controller method and still get a nice html view, just l…

hello.html.twig

{# Thanatos/Hello/hello.html.twig #}
Hi there {{ name }}!

HelloController.php

<?php

namespace Thanatos\Controller;

class HelloController
{
    public function helloAction($name)
    {
        return array(
            'name'  => $name,
        );
    }
}

index.php

<?php

use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;
use Symfony\Component\HttpFoundation\Response;

$app->get('/hello/{name}', 'Thanatos\Controller\HelloController::helloAction');

$dispatcher = $app['dispatcher'];
$dispatcher->addListener(KernelEvents::VIEW, function(GetResponseForControllerResultEvent $event) use ($app) {
    $controller = $app['request']->get('_controller');

    $viewPath = strtr($controller, array(
        'Controller'    => '',
        'Action'        => '',
        '::'            => '/',
        '\\'            => '/',
    ));
    $viewPath .= '.html.twig';

    $response = new Response($app['twig']->render($viewPath, $event->getControllerResult()));

    $event->setResponse($response);
});