File System Context

1// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
2// for details. All rights reserved. Use of this source code is governed by a
3// BSD-style license that can be found in the LICENSE file.
4
5import 'package:file/file.dart';
6import 'package:file/memory.dart';
7
8/// Lists subdirectory names using the [FileSystem]'s own path context
9/// rather than the host OS's global `p.*` functions.
10List<String> listSubdirectoryNames(Directory dir) {
11  final pathContext = dir.fileSystem.path;
12  return dir
13      .listSync()
14      .whereType<Directory>()
15      .map((d) => pathContext.basename(d.path))
16      .toList();
17}
18
19void main() {
20  // Simulates a Windows filesystem running inside a unit test on Linux/macOS.
21  final fs = MemoryFileSystem(style: FileSystemStyle.windows);
22  final projectDir = fs.directory(r'C:\workspace\app\lib')
23    ..createSync(recursive: true);
24  fs.directory(r'C:\workspace\app\lib\src').createSync();
25
26  final subdirs = listSubdirectoryNames(projectDir);
27  print('Subdirectories: $subdirs');
28}