anchor.diff:  const String kZ = 'z';
   const String kCommit = 'commit';
   const String kOrigin = 'origin';
  +const String kJustPrint = 'just-print';
   const String kYes = 'yes';
   const String kHelp = 'help';
   
  
positive.code:     valueHelp: 'repository',
      defaultsTo: 'upstream',
    );
    argParser.addFlag(kYes, negatable: false, abbr: 'y', help: 'Skip the confirmation prompt.');
    argParser.addFlag(kHelp, negatable: false, help: 'Show this help message.', hide: true);
    ArgResults argResults;
  
negative.code:   final String level = argResults[kIncrement];
    final String commit = argResults[kCommit];
    final String origin = argResults[kOrigin];
    final bool justPrint = argResults[kJustPrint];
    final bool autoApprove = argResults[kYes];
    final bool help = argResults[kHelp];
  
  