added suggestions for extra extensions

extra/twig-extra-bundle/src/DependencyInjection/Compiler/MissingExtensionSuggestorPass.php

@@ -0,0 +1,29 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Extra\TwigExtraBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+
+class MissingExtensionSuggestorPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container)
+    {
+        if ($container->getParameter('kernel.debug')) {
+            $container->getDefinition('twig')
+                ->addMethodCall('registerUndefinedFilterCallback', [[new Reference('twig.missing_extension_suggestor'), 'suggestFilter']])
+                ->addMethodCall('registerUndefinedFunctionCallback', [[new Reference('twig.missing_extension_suggestor'), 'suggestFunction']])
+            ;
+        }
+    }
+}

extra/twig-extra-bundle/src/DependencyInjection/TwigExtraExtension.php

@@ -27,6 +27,10 @@ class TwigExtraExtension extends Extension
         $configuration = $this->getConfiguration($configs, $container);
         $config = $this->processConfiguration($configuration, $configs);
 
+        if ($container->getParameter('kernel.debug')) {
+            $loader->load('suggestor.xml');
+        }
+
         if ($this->isConfigEnabled($container, $config['html'])) {
             $loader->load('html.xml');
         }

extra/twig-extra-bundle/src/MissingExtensionSuggestor.php

@@ -0,0 +1,45 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Extra\TwigExtraBundle;
+
+use Twig\Error\SyntaxError;
+
+final class MissingExtensionSuggestor
+{
+    private const FILTERS = [
+        'data_uri' => ['HtmlExtension', 'twig/html-extra'],
+        'markdown_to_html' => ['MarkdownExtension', 'twig/markdown-extra'],
+        'html_to_markdown' => ['MarkdownExtension', 'twig/markdown-extra'],
+    ];
+
+    private const FUNCTIONS = [
+        'html_classes' => ['HtmlExtension', 'twig/html-extra'],
+    ];
+
+    public function suggestFilter(string $name): bool
+    {
+        if (isset(self::FILTERS[$name])) {
+            throw new SyntaxError(sprintf('The "%s" filter is part of the %s, which is not installed/enabled; try running "composer require %s twig/extra-bundle".', $name, self::FILTERS[$name][0], self::FILTERS[$name][1]));
+        }
+
+        return false;
+    }
+
+    public function suggestFunction(string $name): bool
+    {
+        if (isset(self::FUNCTIONS[$name])) {
+            throw new SyntaxError(sprintf('The "%s" function is part of the %s, which is not installed/enabled; try running "composer require %s twig/extra-bundle".', $name, self::FILTERS[$name][0], self::FILTERS[$name][1]));
+        }
+
+        return false;
+    }
+}

extra/twig-extra-bundle/src/Resources/config/suggestor.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+
+<container xmlns="http://symfony.com/schema/dic/services"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
+
+    <services>
+        <defaults public="false" />
+
+        <service id="twig.missing_extension_suggestor" class="Twig\Extra\TwigExtraBundle\MissingExtensionSuggestor" />
+    </services>
+</container>

extra/twig-extra-bundle/src/TwigExtraBundle.php

@@ -11,12 +11,16 @@
 
 namespace Twig\Extra\TwigExtraBundle;
 
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpKernel\Bundle\Bundle;
+use Twig\Extra\TwigExtraBundle\DependencyInjection\Compiler\MissingExtensionSuggestorPass;
 
 class TwigExtraBundle extends Bundle
 {
-    public function getPath()
+    public function build(ContainerBuilder $container)
     {
-        return \dirname(__DIR__);
+        parent::build($container);
+
+        $container->addCompilerPass(new MissingExtensionSuggestorPass());
     }
 }