Add bundle classes generator

src/Drupal/Commands/core/drush.services.yml

@@ -21,6 +21,11 @@ services:
       arguments: ['@entity_type.manager']
       tags:
         -  { name: drush.command }
+  entity.generators:
+    class: Drush\Drupal\Generators\entity\EntityBundleClassesGenerator
+    arguments: ['@entity_type.bundle.info', '@entity_type.manager']
+    tags:
+      - { name: drush.generator.v2 }
   image.commands:
     class: \Drush\Drupal\Commands\core\ImageCommands
     tags:

src/Drupal/Generators/entity/EntityBundleClassesGenerator.php

@@ -0,0 +1,57 @@
+<?php
+namespace Drush\Drupal\Generators\entity;
+
+use Drupal\Core\Entity\EntityTypeBundleInfoInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use DrupalCodeGenerator\Command\ModuleGenerator;
+use DrupalCodeGenerator\Utils;
+use Symfony\Component\Console\Question\ChoiceQuestion;
+
+class EntityBundleClassesGenerator extends ModuleGenerator
+{
+    protected string $name = 'entity:bundle-classes';
+    protected string $description = 'Generate a bundle class for each content entity.';
+    protected string $alias = 'ebc';
+    protected string $templatePath = __DIR__;
+
+    protected $bundleInfo;
+    protected $entityTypeManager;
+
+    public function __construct(EntityTypeBundleInfoInterface $bundleInfo, EntityTypeManagerInterface $entityTypeManager)
+    {
+        parent::__construct($this->name);
+        $this->bundleInfo = $bundleInfo;
+        $this->entityTypeManager = $entityTypeManager;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function generate(array &$vars): void
+    {
+        $this->collectDefault($vars);
+        $vars['infos'] = $this->bundleInfo->getAllBundleInfo();
+        $choices = array_keys($vars['infos']);
+        $question = new ChoiceQuestion('Entity type(s). Use comma to delimit.', $choices, 'node');
+        $question->setValidator([static::class, 'validateRequired']);
+        $question->setMultiselect(true);
+        $vars['entity_type_ids'] = $this->io->askQuestion($question);
+        $this->addFile($vars['machine_name'] . '.module', 'hook_bundle_info.php')
+            // @todo When we require 2.1, use https://getcomposer.org/doc/07-runtime.md#installed-versions
+            // to get path to DCG so we use its templates/_lib/file-docs/module.twig instead of a copy of that file.
+            ->headerTemplate('module.twig')
+            ->appendIfExists()
+            ->headerSize(7);
+        foreach ($vars['entity_type_ids'] as $id) {
+            $base_class = $vars['base_class'] = Utils::camelize($id . 'BundleBase');
+            $vars['entity_class'] = $this->entityTypeManager->getStorage($id)->getEntityClass();
+            $vars['entity_type_id'] = $id;
+            $this->addFile("src/Bundle/$id/${base_class}.php", 'base_bundle_class.php.twig')->vars($vars);
+            foreach ($vars['infos'][$id] as $bundle => $info) {
+                $bundle_class = $vars['bundle_class'] = Utils::camelize($bundle);
+                $this->addFile("src/Bundle/$id/${bundle_class}.php", 'bundle_class.php.twig')->vars($vars);
+            }
+        }
+        $this->logger->warning('Run `drush cache:rebuild` so the bundle classes are recognized.');
+    }
+}

src/Drupal/Generators/entity/base_bundle_class.php.twig

@@ -0,0 +1,11 @@
+<?php
+namespace Drupal\{{ machine_name }}\Bundle\{{ entity_type_id }};
+
+use {{ entity_class }};
+
+/**
+ * A base bundle class for {{ entity_type_id }} entities.
+ */
+abstract class {{ base_class }} extends {{ entity_class|split('\\')|last }} {
+
+}

src/Drupal/Generators/entity/bundle_class.php.twig

@@ -0,0 +1,9 @@
+<?php
+namespace Drupal\{{ machine_name }}\Bundle\{{ entity_type_id }};
+
+/**
+ * A bundle class for {{ entity_type_id }} entities.
+ */
+class {{ bundle_class }} extends {{ base_class }} {
+
+}

src/Drupal/Generators/entity/hook_bundle_info.php.twig

@@ -0,0 +1,10 @@
+/**
+* Implements hook_entity_bundle_info_alter().
+*/
+function drush_empty_module_entity_bundle_info_alter(array &$bundles): void {
+{% for id in entity_type_ids %}
+  {% for bundle in infos[id]|keys %}
+    $bundles['{{ id }}']['{{ bundle }}']['class'] = \Drupal\{{ machine_name }}\Bundle\{{ id }}\{{ bundle|camelize }}::class;
+  {% endfor %}
+{% endfor %}
+}

src/Drupal/Generators/entity/module.twig

@@ -0,0 +1,6 @@
+<?php
+
+/**
+ * @file
+ * Primary module hooks for {{ machine_name }} module.
+ */