mathjax.install

<?php
/**
 * @file
 * MathJax module install.
 */

/**
 * Implements hook_uninstall().
 */
function mathjax_uninstall() {
  variable_del('mathjax_config_type');
  variable_del('mathjax_config_string');
  variable_del('mathjax_use_cdn');
  variable_del('mathjax_cdn_url');
  cache_clear_all('variables', 'cache_bootstrap');
}


/**
 * Implements hook_requirements().
 */
function mathjax_requirements($phase) {
  $requirements = array();
  $t = get_t();
  if ($phase == 'runtime') {
    if (!variable_get('mathjax_use_cdn', TRUE)) {
      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,
        );
      }
      if (!function_exists('libraries_get_path')) {
        $requirements['mathjax_libraries_dependency'] = array(
          'title' => $t('MathJax'),
          'value' => $t('Missing libraries module'),
          'description' => $t("MathJax is configured to use local library files but the libraries module is not enabled. 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() {
  if (function_exists('libraries_get_path')) {
    $mathjax_path = libraries_get_path('mathjax');
    $jspath = $mathjax_path . '/MathJax.js';
    $jsp = file_exists($jspath);
    return $jsp;
  }
  return FALSE;
}

/**
 * Implements hook_update_N().
 *
 * Removes deprecated configuration variables.
 */
function mathjax_update_7001() {
  variable_del('mathjax_enabled');
  variable_del('mathjax_pages');
  variable_del('mathjax_active_type');
  variable_set('mathjax_config_type', 1);
  if (!variable_get('mathjax_config_string')) {
    $str = <<<EOD
MathJax.Hub.Config({
  extensions: ['tex2jax.js'],
  jax: ['input/TeX','output/HTML-CSS'],
  tex2jax: {
    inlineMath: [ ['$','$'], ['\\\\(','\\\\)'] ],
    processEscapes: true
  },
  showProcessingMessages: false,
  messageStyle: 'none'
});
EOD;
    variable_set('mathjax_config_string', $str);
  }
}