anchor.diff:        ..addFlag('customers',
             abbr: 'c',
             defaultsTo: false,
  -          help: 'Only show issues with customer labels');
  +          help: 'Only show issues with customer labels')
  +      ..addOption('delta', abbr: 'd', help: 'delta between dates, default = 7');
  +
       try {
         _results = _parser.parse(args);
         if (_results['help']) _printUsage();
  
positive.code:     if (opts.summarize) {
        var openCount = HashMap<String, int>();
        var closeCount = HashMap<String, int>();
        // Mean time to close of issues closed this period (looks back)
        var meanUntilClosed = HashMap<String, Duration>();
        // Mean time to close of issues opened this period (looks forward)
  
negative.code:     }
  
      // Skip to the next period
      current = next;
    }
  }
  