ArgParser Dart

Links

• Dart

Standard

void usage(String message, ArgParser parser) {
  log('''
Usage: scrambler <command> <args_and_opts>'
  Modifies source code.''');
  log(parser.usage);
  log('''
scrambler codepoints <text1> [<text2> ...]
  Shows the codepoints of  <textN>.''');
  log(parser.commands['codepoints']!.usage);
  log('''
scrambler shuffle <input> <output>
  Reorders source code from file <input> into file <output>.''');
  log(parser.commands['shuffle']!.usage);
  error(message);
  exit(1);
}

void main(List<String> args) {
  final parser = ArgParser();
  //M1
  parser.addFlag(
    'verbose',
    abbr: 'v',
    help: 'shows more information',
  );
  final codepointParser = ArgParser();
  final shuffleParser = ArgParser();
  parser.addCommand('codepoints', codepointParser);
  parser.addCommand('shuffle', shuffleParser);
  shuffleParser.addFlag(
    'reverse',
    abbr: 'h',
    help: 'Sorts ranges in reverse order (for testing).',
  );
  final results = parser.parse(args);
  if (results.command == null) {
    usage('missing <command>', parser);
  }
  final mode = results.command!.name!;
  if ('codepoints'.startsWith(mode)) {
    codepoints(results.command!, parser);
  } else if ('decode'.startsWith(mode)) {
...
  }
}