code: public function listTasks($ostr = STDOUT)
      {
          $this->findTasks();
          if (count($this->task_list) === 0)
          {
  			// @codeCoverageIgnoreStart
              fprintf($ostr, "No tasks available\n");
  			// @codeCoverageIgnoreEnd
          }
          else
          {
              fprintf($ostr, "Listing available tasks: \n");
  
              foreach ($this->task_list as $task => $desc)
              {
                  $task = str_replace('\\', ':', $task);
                  fprintf($ostr, "- %-30s", $task);
                  CLI::formatText(32, CLI::MAX_LINE_LENGTH, ' ' . $desc, $ostr);
              }
              printf("\n");
          }
      }
docs: List the registered tasks
  @param $ostr resource The output stream to write to. Defaults to STDOUT