Support directories other than "web" in pub build.

sdk/lib/_internal/pub/lib/src/barback/sources.dart

-// Copyright (c) 2013, 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 pub.barback.sources;
-
-import 'dart:async';
-
-import 'package:barback/barback.dart';
-import 'package:path/path.dart' as path;
-import 'package:watcher/watcher.dart';
-
-import '../entrypoint.dart';
-import '../io.dart';
-import '../package.dart';
-import '../package_graph.dart';
-
-/// Adds all of the source assets in the provided packages to barback and
-/// then watches the public directories for changes.
-///
-/// [watcherFactory] should return a [DirectoryWatcher] watching the given
-/// directory for changes.
-///
-/// Returns a Future that completes when the sources are loaded and the watchers
-/// are active.
-Future watchSources(PackageGraph graph, Barback barback,
-    WatcherType watcherType) {
-  return Future.wait(graph.packages.values.map((package) {
-    // If this package comes from a cached source, its contents won't change so
-    // we don't need to monitor it. `packageId` will be null for the application
-    // package, since that's not locked.
-    var packageId = graph.lockFile.packages[package.name];
-    if (packageId != null &&
-        graph.entrypoint.cache.sources[packageId.source].shouldCache) {
-      barback.updateSources(_listAssets(graph.entrypoint, package));
-      return new Future.value();
-    }
-
-    // Watch the visible package directories for changes.
-    return Future.wait(_getPublicDirectories(graph.entrypoint, package)
-        .map((name) {
-      var subdirectory = path.join(package.dir, name);
-      if (!dirExists(subdirectory)) return new Future.value();
-
-      // TODO(nweiz): close these watchers when [barback] is closed.
-      var watcher = watcherType.create(subdirectory);
-      watcher.events.listen((event) {
-        // Don't watch files symlinked into these directories.
-        // TODO(rnystrom): If pub gets rid of symlinks, remove this.
-        var parts = path.split(event.path);
-        if (parts.contains("packages") || parts.contains("assets")) return;
-
-        // Skip ".js" files that were (most likely) compiled from nearby ".dart"
-        // files. These are created by the Editor's "Run as JavaScript" command
-        // and are written directly into the package's directory. When pub's
-        // dart2js transformer then tries to create the same file name, we get
-        // a build error. To avoid that, just don't consider that file to be a
-        // source.
-        // TODO(rnystrom): Remove this when the Editor no longer generates .js
-        // files. See #15859.
-        if (event.path.endsWith(".dart.js")) return;
-
-        var id = new AssetId(package.name,
-            path.relative(event.path, from: package.dir));
-        if (event.type == ChangeType.REMOVE) {
-          barback.removeSources([id]);
-        } else {
-          barback.updateSources([id]);
-        }
-      });
-      return watcher.ready;
-    })).then((_) {
-      barback.updateSources(_listAssets(graph.entrypoint, package));
-    });
-  }));
-}
-
-/// Adds all of the source assets in the provided packages to barback.
-void loadSources(PackageGraph graph, Barback barback) {
-  for (var package in graph.packages.values) {
-    barback.updateSources(_listAssets(graph.entrypoint, package));
-  }
-}
-
-/// Lists all of the visible files in [package].
-///
-/// This is the recursive contents of the "asset" and "lib" directories (if
-/// present). If [package] is the entrypoint package, it also includes the
-/// contents of "web".
-List<AssetId> _listAssets(Entrypoint entrypoint, Package package) {
-  var files = <AssetId>[];
-
-  for (var dirPath in _getPublicDirectories(entrypoint, package)) {
-    var dir = path.join(package.dir, dirPath);
-    if (!dirExists(dir)) continue;
-    for (var entry in listDir(dir, recursive: true)) {
-      // Ignore "packages" symlinks if there.
-      if (path.split(entry).contains("packages")) continue;
-
-      // Skip directories.
-      if (!fileExists(entry)) continue;
-
-      // Skip ".js" files that were (most likely) compiled from nearby ".dart"
-      // files. These are created by the Editor's "Run as JavaScript" command
-      // and are written directly into the package's directory. When pub's
-      // dart2js transformer then tries to create the same file name, we get
-      // a build error. To avoid that, just don't consider that file to be a
-      // source.
-      // TODO(rnystrom): Remove this when the Editor no longer generates .js
-      // files. See #15859.
-      if (entry.endsWith(".dart.js")) continue;
-
-      var id = new AssetId(package.name,
-          path.relative(entry, from: package.dir));
-      files.add(id);
-    }
-  }
-
-  return files;
-}
-
-/// Gets the names of the top-level directories in [package] whose contents
-/// should be provided as source assets.
-Iterable<String> _getPublicDirectories(Entrypoint entrypoint, Package package) {
-  var directories = ["asset", "lib"];
-  if (package.name == entrypoint.root.name) directories.add("web");
-  return directories;
-}
-
-/// An enum describing different modes of constructing a [DirectoryWatcher].
-abstract class WatcherType {
-  /// A watcher that automatically chooses its type based on the operating
-  /// system.
-  static const AUTO = const _AutoWatcherType();
-
-  /// A watcher that always polls the filesystem for changes.
-  static const POLLING = const _PollingWatcherType();
-
-  /// No directory watcher at all.
-  static const NONE = const _NoneWatcherType();
-
-  /// Creates a new DirectoryWatcher.
-  DirectoryWatcher create(String directory);
-
-  String toString();
-}
-
-class _AutoWatcherType implements WatcherType {
-  const _AutoWatcherType();
-
-  DirectoryWatcher create(String directory) =>
-    new DirectoryWatcher(directory);
-
-  String toString() => "auto";
-}
-
-class _PollingWatcherType implements WatcherType {
-  const _PollingWatcherType();
-
-  DirectoryWatcher create(String directory) =>
-    new PollingDirectoryWatcher(directory);
-
-  String toString() => "polling";
-}
-
-class _NoneWatcherType implements WatcherType {
-  const _NoneWatcherType();
-
-  DirectoryWatcher create(String directory) => null;
-
-  String toString() => "none";
-}