multiline static method

String? multiline({ required String title, int maxLines = 200, bool allowEmpty = true, })

Reads ordinary lines until a line containing only . submits. A line containing only :cancel cancels the prompt.

Implementation

static String? multiline({
  required String title,
  int maxLines = 200,
  bool allowEmpty = true,
}) {
  TerminalContext.output.writeln(
    '${terminalSafeLineText(title)} (enter . to submit, :cancel to cancel)',
  );
  final lines = <String>[];
  while (lines.length < maxLines) {
    final line = TerminalContext.input.readLineSync();
    if (line == null) {
      if (lines.any((value) => value.isNotEmpty)) return lines.join('\n');
      return allowEmpty ? '' : null;
    }
    if (line == ':cancel') return null;
    if (line == '.') {
      if (allowEmpty || lines.any((value) => value.isNotEmpty)) {
        return lines.join('\n');
      }
      _writeError('Input cannot be empty.');
      continue;
    }
    lines.add(line);
  }
  if (lines.any((value) => value.isNotEmpty)) return lines.join('\n');
  return allowEmpty ? '' : null;
}