anchor.diff:  import 'package:args/args.dart';
   import 'dart:io';
   
  -
  -
  -class Options  {
  +class Options {
     final _parser = ArgParser(allowTrailingOptions: false);
     ArgResults _results;
     DateTime get from => DateTime.parse(_results['from']);
     DateTime get to => DateTime.parse(_results['to']);
     int get exitCode => _results == null ? -1 : _results['help'] ? 0 : null;
  -
  +  bool get excludePerformance => _results['include-performance'] ?? false;
     Options(List<String> args) {
       _parser
  -      ..addFlag('help', defaultsTo: false, abbr: 'h', negatable: false, help: 'get usage')
  -      ..addOption('from', defaultsTo: DateTime.now().subtract(Duration(hours: 24 * 7)).toString(), abbr: 'f', help: 'from date, ISO format yyyy-mm-dd')
  -      ..addOption('to', defaultsTo: DateTime.now().toIso8601String(), abbr: 't', help: 'to date, ISO format yyyy-mm-dd');
  +      ..addFlag('help',
  +          defaultsTo: false, abbr: 'h', negatable: false, help: 'get usage')
  +      ..addOption('from',
  +          defaultsTo:
  +              DateTime.now().subtract(Duration(hours: 24 * 7)).toString(),
  +          abbr: 'f',
  +          help: 'from date, ISO format yyyy-mm-dd')
  +      ..addOption('to',
  +          defaultsTo: DateTime.now().toIso8601String(),
  +          abbr: 't',
  +          help: 'to date, ISO format yyyy-mm-dd')
  +      ..addOption('include-performance',
  +          abbr: 'p', help: 'include performance issues');
       try {
         _results = _parser.parse(args);
  -      if (_results['help'])  _printUsage();
  +      if (_results['help']) _printUsage();
       } on ArgParserException catch (e) {
         print(e.message);
         _printUsage();
  
positive.code:   }
  }
  
  void printHeader(Options opts) {
    var fromStamp = opts.from.toIso8601String().substring(0,10);
    var toStamp = opts.to.toIso8601String().substring(0,10);
  
    print('\n\nTo: flutter-team@google.com, flutter-dart-tpm@google.com\n\n');
    if (DateTime.now().weekday == DateTime.tuesday) print('Subject: Flutter TODAY Tuesday report!\n');
    if (DateTime.now().weekday == DateTime.thursday) print('Subject: Flutter TODAY Thursday report!\n');
    if (DateTime.now().weekday != DateTime.tuesday &&
        DateTime.now().weekday != DateTime.thursday) {
      print('Subject: TODAY issues from ${fromStamp} to ${toStamp}\n\n');
    }
    print('\n\n---\n\n');
  }
  
negative.code:   if (opts.exitCode != null) exit(opts.exitCode);
    final token = Platform.environment['GITHUB_TOKEN'];
    final github = GitHub(token);
    final closedRange =
        DateRange(DateRangeType.range, start: opts.from, end: opts.to);
    final openedRange = DateRange(DateRangeType.range,
        start: opts.to.subtract(Duration(hours: 24 * 7)), end: opts.to);
  
    var openIssues = await github.search(
      owner: 'flutter',
      name: 'flutter',
      type: GitHubIssueType.issue,
      state: GitHubIssueState.open,
      labels: ['P0'],
    );
  
    var closedIssues = await github.search(
      owner: 'flutter',
      name: 'flutter',
      type: GitHubIssueType.issue,
      state: GitHubIssueState.closed,
      labels: ['P0'],
  