[TwigBridge] Show Twig's loader paths on debug:twig command

src/Symfony/Bridge/Twig/Command/DebugCommand.php

@@ -18,6 +18,7 @@ use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Twig\Environment;
+use Twig\Loader\FilesystemLoader;
 
 /**
  * Lists twig functions, filters, globals and tests present in the current project.
@@ -29,11 +30,13 @@ class DebugCommand extends Command
     protected static $defaultName = 'debug:twig';
 
     private $twig;
+    private $projectDir;
 
     /**
      * @param Environment $twig
+     * @param string|null $projectDir
      */
-    public function __construct($twig = null)
+    public function __construct($twig = null, $projectDir = null)
     {
         if (!$twig instanceof Environment) {
             @trigger_error(sprintf('Passing a command name as the first argument of "%s" is deprecated since version 3.4 and will be removed in 4.0. If the command was registered by convention, make it a service instead.', __METHOD__), E_USER_DEPRECATED);
@@ -46,6 +49,7 @@ class DebugCommand extends Command
         parent::__construct();
 
         $this->twig = $twig;
+        $this->projectDir = $projectDir;
     }
 
     public function setTwigEnvironment(Environment $twig)
@@ -120,6 +124,7 @@ EOF
                 }
             }
             $data['tests'] = array_keys($data['tests']);
+            $data['loader_paths'] = $this->getLoaderPaths();
             $io->writeln(json_encode($data));
 
             return 0;
@@ -145,9 +150,54 @@ EOF
             $io->listing($items);
         }
 
+        $rows = array();
+        foreach ($this->getLoaderPaths() as $namespace => $paths) {
+            if (count($paths) > 1) {
+                $rows[] = array('', '');
+            }
+            foreach ($paths as $path) {
+                $rows[] = array($namespace, '- '.$path);
+                $namespace = '';
+            }
+            if (count($paths) > 1) {
+                $rows[] = array('', '');
+            }
+        }
+        array_pop($rows);
+        $io->section('Loader Paths');
+        $io->table(array('Namespace', 'Paths'), $rows);
+
         return 0;
     }
 
+    private function getLoaderPaths()
+    {
+        if (!($loader = $this->twig->getLoader()) instanceof FilesystemLoader) {
+            return array();
+        }
+
+        $loaderPaths = array();
+        foreach ($loader->getNamespaces() as $namespace) {
+            $paths = array_map(function ($path) use ($namespace) {
+                if (null !== $this->projectDir && 0 === strpos($path, $this->projectDir)) {
+                    $path = ltrim(substr($path, strlen($this->projectDir)), DIRECTORY_SEPARATOR);
+                }
+
+                return $path;
+            }, $loader->getPaths($namespace));
+
+            if (FilesystemLoader::MAIN_NAMESPACE === $namespace) {
+                $namespace = '(None)';
+            } else {
+                $namespace = '@'.$namespace;
+            }
+
+            $loaderPaths[$namespace] = $paths;
+        }
+
+        return $loaderPaths;
+    }
+
     private function getMetadata($type, $entity)
     {
         if ($type === 'globals') {

src/Symfony/Bundle/TwigBundle/Resources/config/console.xml

@@ -9,6 +9,7 @@
 
         <service id="Symfony\Bridge\Twig\Command\DebugCommand">
             <argument type="service" id="twig" />
+            <argument>%kernel.project_dir%</argument>
             <tag name="console.command" command="debug:twig" />
         </service>