Make GeSHi Filter Caching Awesomer

The caching that the GeSHi Filter currently does is awesome. It reads in the language names, and then holds onto them throughout GeSHi execution. When we look at a function that does this caching, we see:

/**
 * List of enabled languages.
 */
function _geshifilter_get_enabled_languages() {
  static $enabled_languages = NULL;
  if ($enabled_languages == NULL) {
    $enabled_languages = array();
    $languages = _geshifilter_get_available_languages();
    foreach ($languages as $key => $language) {
      if (variable_get("geshifilter_language_enabled_{$language}", TRUE)) {
        $enabled_languages[$key] = $language;
      }
    }
  }
  return $enabled_languages;
}

As you can see, we use a static variable to hold the data. It would make the caching even awesomer (yes, awesomer is a word) if we used cache_get and cache_set in addition to this for some added database mastery. The end result would look something like this:

/**
* List of enabled languages.
*/
function _geshifilter_get_enabled_languages() {
static $enabled_languages = NULL;
if ($enabled_languages == NULL) {
$enabled_languages = cache_get('geshi_enabled_languages', 'cache_filter');
if ($enabled_languages == NULL) {
$enabled_languages = array();
$languages = _geshifilter_get_available_languages();
foreach ($languages as $key => $language) {
if (variable_get("geshifilter_language_enabled_{$language}", TRUE)) {
$enabled_languages[$key] = $language;
}
}
cache_set('geshi_enabled_languages', 'cache_filter', $enabled_languages);
}
return $enabled_languages;
}
?>

As you see in this pseudo code, not only do we use the static variable, we also use the database caching table to hold onto the enabled languages. This makes the method extremely fast, even when the static variable is lost. When the static variable is lost, and the database cache isn't there, it creates the cached item in the database, making it ready for action.