pkg/analyzer_cli/test/utils.dart

// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:io';
import 'dart:isolate';

import 'package:path/path.dart' as pathos;

/// Gets the test directory in a way that works with package:test
/// See <https://github.com/dart-lang/test/issues/110> for more info.
final String testDirectory = pathos.join(
  pathos.dirname(
    pathos.dirname(
      Isolate.resolvePackageUriSync(
        Uri.parse('package:analyzer_cli/starter.dart'),
      )!.toFilePath(),
    ),
  ),
  'test',
);

/// Recursively copy the specified [src] directory (or file)
/// to the specified destination path.
Future<void> recursiveCopy(FileSystemEntity src, String dstPath) async {
  if (src is Directory) {
    await Directory(dstPath).create(recursive: true);
    for (var entity in src.listSync()) {
      await recursiveCopy(
        entity,
        pathos.join(dstPath, pathos.basename(entity.path)),
      );
    }
  } else if (src is File) {
    await src.copy(dstPath);
  }
}

/// Creates a temporary directory and passes its path to [fn]. Once [fn]
/// completes, the temporary directory and all its contents will be deleted.
///
/// Returns the return value of [fn].
Future<dynamic> withTempDirAsync(
  Future<dynamic> Function(String path) fn,
) async {
  var tempDir = (await Directory.systemTemp.createTemp('analyzer_')).path;
  try {
    return await fn(tempDir);
  } finally {
    await Directory(tempDir).delete(recursive: true);
  }
}