private function tasks($extensive)
 {
     $header = "\nAvailable tasks:\n---------------\n\n";
     $tasks = SourceTasks::show();
     $content = $extensive ? self::checks_extensive($this->color, $tasks) : self::checks_brief($this->color, $tasks);
     return $header . $content;
 }
 public static function show()
 {
     try {
         $return = Tasks::show();
     } catch (Exception $e) {
         throw new RpcException($e->getMessage(), -31001);
     }
     return $return;
 }