// Copyright (c) 2023, 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 'package:path/path.dart' as path;

String get linterPackageRoot => path.joinAll(_packageRoot);

List<String> get _packageRoot {
  var parts = path.split(path.dirname(path.fromUri(Platform.script.path)));
  while (parts.last != 'linter') {
    parts.removeLast();
    if (parts.isEmpty) {
      throw StateError("Script is not located inside a 'linter' directory? "
          "'${Platform.script.path}'");
    }
  }
  return parts;
}

String pathRelativeToPackageRoot(Iterable<String> parts) =>
    path.joinAll([..._packageRoot, ...parts]);

String pathRelativeToPkgDir(Iterable<String> parts) {
  var pathParts = _packageRoot;
  pathParts.replaceRange(pathParts.length - 1, pathParts.length, parts);
  return path.joinAll(pathParts);
}