charts-8.x-4.x-dev/modules/charts_google/charts_google.install

<?php

/**
 * @file
 * Installation and uninstallation functions.
 */

/**
 * Implements hook_requirements().
 */
function charts_google_requirements($phase) {
  $requirements = [];

  switch ($phase) {
    case 'runtime':
      $library_path = charts_google_find_library();

      if (!$library_path) {
        $requirements['charts_google_js'] = [
          'title' => t('Google Charts Library'),
          'value' => t('Not Installed'),
          'severity' => REQUIREMENT_WARNING,
          'description' => t('You are missing the Google Charts library in your Drupal installation directory. Please see the README file inside charts_google for instructions to install the library.'),
        ];
      }
      else {
        $requirements['charts_google_js'] = [
          'title' => t('Google Charts Library'),
          'severity' => REQUIREMENT_OK,
          'value' => t('Installed'),
        ];
      }
      break;
  }

  return $requirements;
}

/**
 * Get the location of the Google Charts library.
 *
 * @return string
 *   The location of the library, or FALSE if the library isn't installed.
 */
function charts_google_find_library() {
  // The following logic is taken from libraries_get_libraries()
  $search_dir = [];

  // Similar to 'modules' and 'themes' directories inside an installation
  // profile, installation profiles may want to place libraries into a
  // 'libraries' directory.
  $search_dir[] = 'profiles/' . \Drupal::installProfile() . '/libraries';

  // Always search libraries.
  $search_dir[] = 'libraries';

  // Also search sites/<domain>/*.
  $container = \Drupal::getContainer();
  $site_path = $container->getParameter('site.path');
  $site_path = explode('/', $site_path);
  $site_name = $site_path[1];
  $search_dir[] = $site_name . '/libraries';

  foreach ($search_dir as $dir) {
    if (file_exists($dir . '/google_charts/loader.js')) {
      return $dir . '/google_charts';
    }
  }

  return FALSE;
}