multiselect static method

List<String> multiselect(String question, List<String> options, { List<int> defaultIndices = const [], })

Display a multi-select prompt

Implementation

static List<String> multiselect(String question, List<String> options,
    {List<int> defaultIndices = const []}) {
  stdout.writeln('\x1B[36m?\x1B[0m $question');
  stdout.writeln('');
  stdout.writeln('Select items by typing numbers separated by commas (e.g., 1,3,5)');
  stdout.writeln('Press Enter to confirm');
  stdout.writeln('');

  for (var i = 0; i < options.length; i++) {
    final isSelected = defaultIndices.contains(i + 1);
    final mark = isSelected ? '☑' : '☐';
    stdout.writeln('  $mark [${i + 1}] ${options[i]}');
  }

  stdout.writeln('');

  while (true) {
    stdout.write('\x1B[36m?\x1B[0m Selection [${defaultIndices.join(',')}] ');
    final response = stdin.readLineSync()?.trim();

    // Use default if empty
    if (response == null || response.isEmpty) {
      return defaultIndices.map((i) => options[i - 1]).toList();
    }

    // Parse selection
    final indices = response.split(',').map((s) => int.tryParse(s.trim())).whereType<int>().toList();

    // Validate
    final valid = indices.every((i) => i > 0 && i <= options.length);
    if (valid && indices.isNotEmpty) {
      return indices.map((i) => options[i - 1]).toList();
    }

    error('Invalid selection. Please try again.');
  }
}