I've seen a lot of questions about how to implement a Twig extension
successfully in a Symfony 2 project but no real answers (mostly snarky
comments (: ).
It took some figuring out. So here are the key steps:
* Write your Twig extension in a bundle of your choice, let's say SillyCMSBundle
* Namespace it, and make sure to 'use' the Twig classes you need so
you can still refer to them (you could also \ them every time):
namespace Application\SillyCMSBundle\Twig\Extensions;
use \Twig_Filter_Function;
use \Twig_Environment;
use \Twig_Extension;
For this to work, WikiText.php needs to live in the
src/SillyCMSBundle/Twig/Extensions folder, assuming that
src/SillyCMSBundle is where my app's kernel looks for that bundle.
* When you write your getFilters method, make sure you namespace the
string that gives the path to the filter:
public function getFilters()
{
return array(
'wiki_text' => new
Twig_Filter_Function('\Application\SillyCMSBundle\Twig\Extensions\twig_wikitext_filter',
array('is_safe' => array('html'), 'pre_escape' => 'html'))
);
}
Notice that the function name has a fully qualified path just like a
class in a namespace.
Now functions you write in this file, which are namespaced just like
classes in this file, can actually be found by Twig.
* Like the Symfony 2 Twig documentation says, register your extension
as a service in config.yml and tag it so that the Twig bundle knows to
look for it:
services:
twig.extension.WikiText:
class: Application\SillyCMSBundle\Twig\Extensions\WikiText
tags:
- { name: twig.extension }
If you have problems, triple-check that your namespace paths are consistent.
You can find the whole thing here:
https://github.com/boutell/SillyCMS
--
Tom Boutell
P'unk Avenue
215 755 1330
punkave.com
window.punkave.com
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