String _getCommandUsage()

in lib/command_runner.dart [452:498]

• 36 lines of code
• 7 McCabe index (conditional complexity)

String _getCommandUsage(Map<String, Command> commands,
    {bool isSubcommand = false, int? lineLength}) {
  // Don't include aliases.
  var names =
      commands.keys.where((name) => !commands[name]!.aliases.contains(name));

  // Filter out hidden ones, unless they are all hidden.
  var visible = names.where((name) => !commands[name]!.hidden);
  if (visible.isNotEmpty) names = visible;

  // Show the commands alphabetically.
  names = names.toList()..sort();

  // Group the commands by category.
  var commandsByCategory = SplayTreeMap<String, List<Command>>();
  for (var name in names) {
    var category = commands[name]!.category;
    commandsByCategory.putIfAbsent(category, () => []).add(commands[name]!);
  }
  final categories = commandsByCategory.keys.toList();

  var length = names.map((name) => name.length).reduce(math.max);

  var buffer = StringBuffer('Available ${isSubcommand ? "sub" : ""}commands:');
  var columnStart = length + 5;
  for (var category in categories) {
    if (category != '') {
      buffer.writeln();
      buffer.writeln();
      buffer.write(category);
    }
    for (var command in commandsByCategory[category]!) {
      var lines = wrapTextAsLines(command.summary,
          start: columnStart, length: lineLength);
      buffer.writeln();
      buffer.write('  ${padRight(command.name, length)}   ${lines.first}');

      for (var line in lines.skip(1)) {
        buffer.writeln();
        buffer.write(' ' * columnStart);
        buffer.write(line);
      }
    }
  }

  return buffer.toString();
}