protected function validateTemplate(\Twig_Environment $twig, OutputInterface $output, $template, $file = null) { try { $twig->parse($twig->tokenize($template, $file ? (string) $file : null)); $output->ok($template, $file); } catch (\Twig_Error $e) { $output->error($template, $e, $file); return 1; } return 0; }