anchor.diff:    } on FormatException catch (e) {
       print(red.wrap(e.message));
       print('');
  -    _printUsage(parser);
  +    _printUsage();
       exitCode = ExitCode.usage.code;
       return;
     }
   
     if (options.help) {
  -    _printUsage(parser);
  +    _printUsage();
       return;
     }
   
  
positive.code:   if (command == null) {
      print(red.wrap("Specify a command: ${parser.commands.keys.join(', ')}"));
      print('');
      _printUsage(parser);
      exitCode = ExitCode.usage.code;
      return;
    }
  
negative.code: String _indent(String input) =>
      LineSplitter.split(input).map((l) => '  $l'.trimRight()).join('\n');
  
  void _printUsage() {
    print('''Usage: pubviz [<args>] <command> [<package path>]
  
  ${styleBold.wrap('Commands:')}
  