Spaceless response based on Symfony2 environment

Question

What I am looking is the way to enable/disable {% spaceless %}{% endspaceless %} wrapper for the whole Response object based on current Symfony environment. I think I should listen to kernel.view event and modify response there, but I can't make it.

The reason for this is that it is better to debug with all those spaces, but keep it minified for production usage.

Has anybody done this?

Answer 1

The spaceless is a Twig tag, the response will never know about it.

You can't easily disable it as it's part of the Twig_Extension_Core and there is no option to disable it.

You have to find another way. Maybe directly from your template (using it or not the depending on the environnement).

Answer 2

Implement a ResponseListener in your bundle:

class ResponseListener
{
    private $container;

    public function __construct($container)
    {
        $this->container = $container;
    }

    public function onKernelResponse(FilterResponseEvent $event)
    {
        // Compress HTML on prod environment only
        if($this->container->get('kernel')->getEnvironment() == 'prod')
            $event->getResponse()->setContent(trim(preg_replace('/>\s+</', '><', $event->getResponse()->getContent())));
    }
}

Then declare in services.yml:

services:
    kernel.listener.response_listener:
        class: AppBundle\Listener\ResponseListener
        tags:
            - { name: kernel.event_listener, event: kernel.response, method: onKernelResponse }
        arguments: [@service_container]