pcb-8.x-2.2/pcb.module

<?php

/**
 * @file
 * Module file for pcb.
 */

use Drupal\Core\Cache\Cache;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Messenger\MessengerInterface;
use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function pcb_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.pcb':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('This module allows keeping site performance in check but not deleting caches which are not Drupal caches when doing drush cr. See README in module to get more details.') . '</p>';

      return $output;
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function pcb_form_system_performance_settings_alter(array &$form, FormStateInterface $form_state) {
  $bins = Cache::getBins();

  foreach ($bins as $bin => $object) {
    if (method_exists($object, 'deleteAllPermanent')) {
      $form['clear_cache'][$bin] = [
        '#name' => $bin,
        '#type' => 'submit',
        '#value' => t('Clear permanent cache for @bin', ['@bin' => $bin]),
        '#submit' => ['pcb_form_system_performance_settings_submit'],
      ];
    }
  }

}

/**
 * Submit callback for clearing specific permanent cache bins.
 */
function pcb_form_system_performance_settings_submit(array &$form, FormStateInterface $form_state) {
  $element = $form_state->getTriggeringElement();
  $bin = $element['#name'] ?? '';
  if (empty($bin)) {
    return;
  }

  $messenger = \Drupal::messenger();
  try {
    \Drupal::service('cache.' . $bin)->deleteAllPermanent();
    $messenger->addMessage(t('Flushed cache for @bin.', ['@bin' => $bin]));
  }
  catch (\Exception $e) {
    $messenger->addMessage($e->getMessage(), MessengerInterface::TYPE_ERROR);
  }
}