TemplateBundle/Twig/TemplateExtension.php

<?php

namespace TemplateBundle\Twig;

use TemplateBundle\Services\TemplateService;

class TemplateExtension extends \Twig_Extension
{

    /**
     * @var TemplateService
     */
    private $templateService;


    /**
     * @param TemplateService $templateService
     */
    public function __construct(TemplateService $templateService)
    {
        $this->templateService = $templateService;
    }

    /**
     * @return array
     */
    public function getFunctions()
    {
        return array(
            new \Twig_SimpleFunction('template_exists', array($this, 'templateExists')),
        );
    }

    /**
     * @param string $name
     *
     * @return boolean
     */
    public function templateExists($name)
    {
        return $this->templateService->exists($name);
    }

    /**
     * @return string
     */
    public function getName()
    {
        return 'template_extension';
    }

}