docs: def _fastfood_build(args):
      """Run on `fastfood build`."""
      written_files, cookbook = food.build_cookbook(
          args.config_file, args.template_pack,
          args.cookbooks, args.force)
  
      if len(written_files) > 0:
          print("%s: %s files written" % (cookbook,
                                          len(written_files)))
      else:
          print("%s up to date" % cookbook)
  
      return written_files, cookbook