createDirectory method

@override Future<void> createDirectory(String path, { bool recursive = false, })

Creates a directory at path.

With recursive, missing parent directories are created and an existing directory is accepted. Without it, the parent must exist and an existing directory throws.

Implementation

@override
Future<void> createDirectory(String path, {bool recursive = false}) async {
  final String normalized = _normalize(path);
  if (_files.containsKey(normalized)) {
    throw StateError('a file already sits at "$path"');
  }
  if (_directories.contains(normalized)) {
    if (!recursive) {
      throw StateError('directory "$path" already exists');
    }
    return;
  }
  if (!recursive && !_directories.contains(_parentOf(normalized))) {
    throw StateError('no parent directory of "$path"');
  }
  _seedAncestorsOf(normalized);
  _directories.add(normalized);
}