docs: def set_up_dirs(proc_name, output_dir=None, work_dir=None, log_dir=None):
      """ Creates output_dir, work_dir, and sets up log
      """
      output_dir = safe_mkdir(adjust_path(output_dir or join(os.getcwd(), proc_name)), 'output_dir')
      debug('Saving results into ' + output_dir)
  
      work_dir = safe_mkdir(work_dir or join(output_dir, 'work'), 'working directory')
      info('Using work directory ' + work_dir)
  
      log_fpath = set_up_log(log_dir or safe_mkdir(join(work_dir, 'log')), proc_name + '.log')
  
      return output_dir, work_dir, log_fpath