getString function

String getString(ArgResults results, String name, String message, { required bool isInteractive, String? desc, String? validate(String)?, })

Implementation

String getString(
  ArgResults results,
  String name,
  String message, {
  required bool isInteractive,
  String? desc,
  String? Function(String)? validate,
}) {
  var value = results[name] as String?;
  if (!isInteractive) {
    if (value == null || value.isEmpty) {
      print('Missing parameter $name is required.');
      exit(1);
    }
    final error = validate?.call(value);
    if (error != null) {
      print('Invalid value $value provided: $error');
      exit(1);
    }
  }
  while (value == null || value.isEmpty) {
    if (desc != null) {
      stdout.write(ansi.darkGray.wrap('\n$desc\u{1B}[1A\r'));
    }
    value = prompts.get(
      message,
      validate: (e) {
        final error = validate?.call(e);
        if (error != null) {
          // clear the line
          stdout.write('\n\r\u{1B}[K');
          stdout.write(ansi.red.wrap('$error\u{1B}[1A\r'));
          return false;
        } else {
          stdout.write('\n\r\u{1B}[K');
          return true;
        }
      },
    );
    if (desc != null) {
      stdout.write('\r\u{1B}[K');
    }
  }
  return value;
}