Drush command to delete and reimporting default content

Interesting -- this works, but it creates a pretty ugly loop.

- default_content must be enabled for the command to be found.
- The content module must be enabled for content to be found.
- Trying to uninstall the two after delete disables the command.

We may be better off putting this in a custom module, except that we're using the State element to prevent re-import.

/**
 * Implements hook_modules_installed().
 */
function default_content_modules_installed($modules) {
  // @todo Move this to an event once we have HookEvent.
  $state = \Drupal::state();
  foreach ($modules as $module) {
    $delete_list = $state->get('default_content_delete') ?? [];
    if (!\Drupal::isConfigSyncing() && !in_array($module, $delete_list, TRUE)) {
      \Drupal::service('default_content.importer')->importContent($module);
    }
  }
}

-- Drush command --

  /**
   * Deletes all the content defined in a module info file.
   *
   * @param string $module_name
   *   The name of the module.
   * @param string $entity_type
   *   The entity type to delete (optional).
   *
   * @command default-content:delete-content
   * @aliases dcdel
   */
  public function contentDeleteModule($module_name, $entity_type = NULL) {
    // Store install / uninstall in state to stop import.
    $state = \Drupal::state();

    // The module must be installed to proceed.
    $module_list = \Drupal::moduleHandler()->getModuleList();
    if (!isset($module_list[$module_name])) {
      $state->set('default_content_delete', [$module_name]);
      \Drupal::service("module_installer")->install([$module_name]);
    }

    // Parse module info.
    $module = \Drupal::moduleHandler()->getModule($module_name);
    $info_file = $module->getPathname();
    $info = \Drupal::service('info_parser')->parse($info_file);
    // @todo Make this nicer later.
    if (!$info) {
      echo 'The module could not be found';
    }

    // Get the content list.
    $default_content = $info['default_content'];
    if ($entity_type) {
      $default_content = $info['default_content'][$entity_type] ?? [];
    }

    // Validate that items to be deleted exist as file definitions.
    $delete_list = [];
    $module_folder = $module->getPath() . '/content';
    foreach ($default_content as $type => $list) {
      $files = [];
      $file_folder = $module_folder . '/' . $type;
      foreach ($list as $filename) {
        $file = $file_folder . '/' . $filename . '.yml';
        if (file_exists($file)) {
          $files[$filename] = $file;
        }
      }
      $delete_list[$type] = array_keys($files);
    }
    if (empty($delete_list)) {
      echo 'No files were found that could be deleted.';
    }

    // Run the delete and get a count of affected entities.
    foreach ($delete_list as $entity_type_key => $uuid_list) {
      $count[$entity_type_key] = 0;
      foreach ($uuid_list as $uuid) {
        $entity = \Drupal::service('entity.repository')->loadEntityByUuid($entity_type_key, $uuid);
        if ($entity) {
          $entity->delete();
          $count[$entity_type_key]++;
        }
      }
    }

    // Report actions taken.
    echo "\nCompleted deletion of $module_name content.\n";
    foreach ($count as $key => $value) {
      echo "- Deleted $value entities of type $key.\n";
    }

    // Uninstall the module in all cases.
    \Drupal::service("module_installer")->uninstall([$module_name, 'default_content']);
    echo "Uninstalled $module_name and default_content.\n You may wish to uninstall hal and serializer as well.\n";
    echo "Run `drush pmu hal serializer -y` to do so.";
    // Delete state variable.
    $state->delete('default_content_delete');
  }

I figured out how to bypass the module enabled bit, patch coming.

OK, I officially hate the git workflow. It's not what I use everyday and I have screwed it up three times -- and I can't delete the branches?!?

Patch coming.

Still needs work, since the drush output is non-standard.

And thanks to GIT defaulting to the 8.x-1.x branch, this patch is malformed.

Please update the project.

New version against 2.0.x.

Notes:

* Still needs better message handling
* Requires that default_content be enabled but not the module that created the content.