sitestudio_gin.install

<?php

/**
 * @file
 * Site Studio Gin Installation Checks.
 *
 * "Borrowed" from gin_toolbar.
 */

use Drupal\Core\Installer\InstallerKernel;

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

  if ($phase !== 'install') {
    return $requirements;
  }

  // We need to check if Gin theme is installed.
  $installed = \Drupal::service('theme_handler')->themeExists('gin');

  // Gin is installed everything's fine.
  if ($installed) {
    return $requirements;
  }

  global $install_state;

  // Check if Drupal should be installed and gin in is in the install profile.
  if (
    InstallerKernel::installationAttempted()
    && isset($install_state['profile_info']['themes'])
    && in_array('gin', $install_state['profile_info']['themes'], TRUE)
  ) {
    return $requirements;
  }

  // Gin is not installed and it's not supposed to be installed.
  $requirements['gin'] = [
    'title' => t('Gin'),
    'description' => t('The Site Studio Gin module works with <a href="https://www.drupal.org/project/gin" target="_blank">Gin</a> theme only'),
    'severity' => REQUIREMENT_ERROR,
  ];

  return $requirements;
}