/**
* server() returns an instance of Leafo\ScssPhp\Server, constructing it if
* necessary.
*
* If you provide an instance of Server as argument, it uses that instead.
*
* @return Server
*/
public static function server($instance = null)
{
if ($instance !== null) {
static::$scss_server = $instance;
} elseif (static::$scss_server === null) {
$sass_cache_dir = craft()->path->getStoragePath() . '/scss_cache';
IOHelper::ensureFolderExists($sass_cache_dir);
static::$scss_server = new Server(dirname(craft()->request->getScriptFile()), $sass_cache_dir);
static::$scss_server->showErrorsAsCSS();
}
return static::$scss_server;
}