mathjax.install in MathJax: LaTeX for Drupal 8.2

MathJax module install.

File

mathjax.install

<?php

/**
 * @file
 * MathJax module install.
 */

/**
 * Implements hook_requirements().
 */
function mathjax_requirements($phase) {
  $requirements = array();
  if ($phase == 'runtime') {
    $config = Drupal::config('mathjax.settings');
    if (!$config
      ->get('use_cdn')) {
      if (!_mathjax_library_present()) {
        $requirements['mathjax_local_libraries'] = array(
          'title' => t('MathJax'),
          'value' => t('Missing JavaScript libraries'),
          'description' => t("MathJax is configured to use local library files but they could not be found. See the README."),
          'severity' => REQUIREMENT_ERROR,
        );
      }
    }
  }
  return $requirements;
}

/**
 * Determines whether the MathJax sources are present.
 *
 * @return bool
 *   True if MathJax is installed
 */
function _mathjax_library_present() {
  $path = Drupal::root() . '/libraries/MathJax/MathJax.js';
  return file_exists($path);
}

/**
 * Update the CDN URL.
 */
function mathjax_update_8201() {
  $config_factory = \Drupal::configFactory();
  $config = $config_factory
    ->getEditable('mathjax.settings');
  $url = $config
    ->get('cdn_url');
  $new = 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js';
  $old = 'https://cdn.mathjax.org/mathjax/latest/MathJax.js';
  if (strpos($url, $old) !== FALSE) {
    $url = str_replace($old, $new, $url);
    $config
      ->set('cdn_url', $url)
      ->save(TRUE);
  }
}

/**
 * Enable on admin to preserve backwards compatibility.
 */
function mathjax_update_8202() {
  $config_factory = \Drupal::configFactory();
  $config = $config_factory
    ->getEditable('mathjax.settings');
  $config
    ->set('enable_for_admin', 1)
    ->save(TRUE);
}

Functions

Name	Description
mathjax_requirements	Implements hook_requirements().
mathjax_update_8201	Update the CDN URL.
mathjax_update_8202	Enable on admin to preserve backwards compatibility.
_mathjax_library_present	Determines whether the MathJax sources are present.