Move pub into sdk/lib/_internal.

utils/pub/validator/directory.dart

-// Copyright (c) 2012, 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.
-
-library directory_validator;
-
-import 'dart:async';
-
-import 'package:pathos/path.dart' as path;
-
-import '../entrypoint.dart';
-import '../io.dart';
-import '../utils.dart';
-import '../validator.dart';
-
-/// A validator that validates a package's top-level directories.
-class DirectoryValidator extends Validator {
-  DirectoryValidator(Entrypoint entrypoint)
-    : super(entrypoint);
-
-  static final _PLURAL_NAMES = ["tools", "tests", "docs", "examples"];
-
-  Future validate() {
-    return new Future.sync(() {
-      for (var dir in listDir(entrypoint.root.dir)) {
-        if (!dirExists(dir)) continue;
-
-        dir = path.basename(dir);
-        if (_PLURAL_NAMES.contains(dir)) {
-          // Cut off the "s"
-          var singularName = dir.substring(0, dir.length - 1);
-          warnings.add('Rename the top-level "$dir" directory to '
-                  '"$singularName".\n'
-              'The Pub layout convention is to use singular directory '
-                  'names.\n'
-              'Plural names won\'t be correctly identified by Pub and other '
-                  'tools.');
-        }
-
-        if (dir.contains(new RegExp(r"^samples?$"))) {
-          warnings.add('Rename the top-level "$dir" directory to "example".\n'
-              'This allows Pub to find your examples and create "packages" '
-                  'directories for them.\n');
-        }
-      }
-    });
-  }
-}