Added the command to generate the batch class.

src/Command/Batch.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DrupalCodeGenerator\Command;
+
+use DrupalCodeGenerator\Application;
+use DrupalCodeGenerator\Asset\AssetCollection;
+use DrupalCodeGenerator\Attribute\Generator;
+use DrupalCodeGenerator\GeneratorType;
+
+#[Generator(
+  name: 'batch',
+  description: 'Generates a batch',
+  templatePath: Application::TEMPLATE_PATH . '/_batch',
+  type: GeneratorType::MODULE_COMPONENT
+)]
+final class Batch extends BaseGenerator {
+
+  /**
+   * {@inheritDoc}
+   */
+  protected function generate(array &$vars, AssetCollection $assets): void {
+    $ir = $this->createInterviewer($vars);
+    $vars['machine_name'] = $ir->askMachineName();
+    $vars['class'] = $ir->askClass(default: '{machine_name|camelize}Batch');
+    $vars['operation_callback'] = $ir->ask('Operation callback method name', 'processItem');
+    $vars['finished_callback'] = $ir->ask('Finished callback method name', 'finished');
+    $assets->addFile('src/{class}.php', 'batch.twig');
+  }
+
+}

templates/_batch/batch.twig

@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\{{ machine_name }};
+
+use Drupal\Core\Batch\BatchBuilder;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+
+/**
+ * Service for batch processing.
+ */
+final class {{ class }} {
+  use StringTranslationTrait;
+
+  /**
+   * Builds a batch.
+   *
+   * @param array $items
+   *   The items to process.
+   *
+   * @return array
+   *   The batch definition.
+   */
+  public function buildBatch(array $items) {
+    $batch_builder = new BatchBuilder();
+    $batch_builder
+      ->setTitle($this->t('Processing items...'))
+      ->setFinishCallback([$this, '{{ finished_callback }}']);
+
+    foreach ($items as $item) {
+      $batch_builder->addOperation([$this, '{{ operation_callback }}'], [$item]);
+    }
+
+    return $batch_builder->toArray();
+  }
+
+  /**
+   * Processes a single batch item.
+   *
+   * @param mixed $item
+   *   The item to process.
+   * @param array $context
+   *   The batch context.
+   */
+  public function {{ operation_callback }}($item, array &$context) {
+    // @todo Implement batch processing logic.
+  }
+
+  /**
+   * Batch finish callback.
+   *
+   * @param bool $success
+   *   Indicates whether the batch process was successful.
+   * @param array $results
+   *   The results from the batch process.
+   * @param array $operations
+   *   The operations that were processed.
+   */
+  public function {{ finished_callback }}(bool $success, array $results, array $operations) {
+    if ($success) {
+      // @todo Implement batch processing logic.
+    }
+    else {
+      // @todo Implement batch processing logic.
+    }
+  }
+
+}

tests/functional/Generator/BatchTest.php

@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DrupalCodeGenerator\Tests\Functional\Generator;
+
+use DrupalCodeGenerator\Command\Batch;
+use DrupalCodeGenerator\Test\Functional\GeneratorTestBase;
+
+/**
+ * Tests batch generator.
+ */
+final class BatchTest extends GeneratorTestBase {
+
+  protected string $fixtureDir = __DIR__ . '/_batch';
+
+  /**
+   * Test callback.
+   */
+  public function testGenerator(): void {
+    $input = [
+      'example',
+      'ExampleBatch',
+      'processItem',
+      'finished',
+    ];
+    $this->execute(Batch::class, $input);
+
+    $expected_display = <<< 'TXT'
+
+     Welcome to batch generator!
+    –––––––––––––––––––––––––––––
+
+     Module machine name:
+     ➤ 
+
+     Class [ExampleBatch]:
+     ➤ 
+
+     Operation callback method name [processItem]:
+     ➤ 
+
+     Finished callback method name [finished]:
+     ➤ 
+
+     The following directories and files have been created or updated:
+    –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
+     • example.info.yml
+     • src/ExampleBatch.php
+
+    TXT;
+
+    $this->assertDisplay($expected_display);
+
+    $this->assertGeneratedFile('src/ExampleBatch.php');
+  }
+
+}

tests/functional/Generator/_batch/src/ExampleBatch.php

@@ -0,0 +1,69 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\example;
+
+use Drupal\Core\Batch\BatchBuilder;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+
+/**
+ * Service for batch processing.
+ */
+final class ExampleBatch {
+  use StringTranslationTrait;
+
+  /**
+   * Builds a batch.
+   *
+   * @param array $items
+   *   The items to process.
+   *
+   * @return array
+   *   The batch definition.
+   */
+  public function buildBatch(array $items) {
+    $batch_builder = new BatchBuilder();
+    $batch_builder
+      ->setTitle($this->t('Processing items...'))
+      ->setFinishCallback([$this, 'finished']);
+
+    foreach ($items as $item) {
+      $batch_builder->addOperation([$this, 'processItem'], [$item]);
+    }
+
+    return $batch_builder->toArray();
+  }
+
+  /**
+   * Processes a single batch item.
+   *
+   * @param mixed $item
+   *   The item to process.
+   * @param array $context
+   *   The batch context.
+   */
+  public function processItem($item, array &$context) {
+    // @todo Implement batch processing logic.
+  }
+
+  /**
+   * Batch finish callback.
+   *
+   * @param bool $success
+   *   Indicates whether the batch process was successful.
+   * @param array $results
+   *   The results from the batch process.
+   * @param array $operations
+   *   The operations that were processed.
+   */
+  public function finished(bool $success, array $results, array $operations) {
+    if ($success) {
+      // @todo Implement batch processing logic.
+    }
+    else {
+      // @todo Implement batch processing logic.
+    }
+  }
+
+}