walkToRootUntilFound function

File? walkToRootUntilFound(String folder, String filename)

Walks upward from folder until filename is found.

Returns null when no matching file exists up to the filesystem root.

Implementation

File? walkToRootUntilFound(String folder, String filename) {
  final Directory current = Directory(folder).absolute;
  final File candidate = File(
    '${current.path}${Platform.pathSeparator}$filename',
  );
  if (candidate.existsSync()) {
    return candidate;
  }

  final Directory parent = current.parent.absolute;
  if (parent.path == current.path) {
    return null;
  }
  return walkToRootUntilFound(parent.path, filename);
}