Remove barback from the repo.

pkg/barback/lib/src/barback.dart

Index: pkg/barback/lib/src/barback.dart
diff --git a/pkg/barback/lib/src/barback.dart b/pkg/barback/lib/src/barback.dart
deleted file mode 100644
index 98d115466bd302a6dfb1381b0aaab5e320fc9fda..0000000000000000000000000000000000000000
--- a/pkg/barback/lib/src/barback.dart
+++ /dev/null
@@ -1,117 +0,0 @@
-// 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 barback.barback;
-
-import 'dart:async';
-
-import 'asset/asset.dart';
-import 'asset/asset_id.dart';
-import 'asset/asset_set.dart';
-import 'log.dart';
-import 'build_result.dart';
-import 'errors.dart';
-import 'graph/package_graph.dart';
-import 'package_provider.dart';
-import 'transformer/transformer.dart';
-
-/// A general-purpose asynchronous build dependency graph manager.
-///
-/// It consumes source assets (including Dart files) in a set of packages,
-/// runs transformations on them, and then tracks which sources have been
-/// modified and which transformations need to be re-run.
-///
-/// To do this, you give barback a [PackageProvider] which can yield a set of
-/// [Transformer]s and raw source [Asset]s. Then you tell it which input files
-/// have been added or modified by calling [updateSources]. Barback will
-/// automatically wire up the appropriate transformers to those inputs and
-/// start running them asynchronously. If a transformer produces outputs that
-/// can be consumed by other transformers, they will automatically be pipelined
-/// correctly.
-///
-/// You can then request assets (either source or generated) by calling
-/// [getAssetById]. This will wait for any necessary transformations and then
-/// return the asset.
-///
-/// When source files have been modified or removed, tell barback by calling
-/// [updateSources] and [removeSources] as appropriate. Barback will
-/// automatically track which transformations are affected by those changes and
-/// re-run them as needed.
-///
-/// Barback tries to be resilient to errors since assets are often in an
-/// in-progress state. When errors occur, they will be captured and emitted on
-/// the [errors] stream.
-class Barback {
-  /// The graph managed by this instance.
-  final PackageGraph _graph;
-
-  /// A stream that emits a [BuildResult] each time the build is completed,
-  /// whether or not it succeeded.
-  ///
-  /// This will emit a result only once every package's [AssetCascade] has
-  /// finished building.
-  ///
-  /// If an unexpected error in barback itself occurs, it will be emitted
-  /// through this stream's error channel.
-  Stream<BuildResult> get results => _graph.results;
-
-  /// A stream that emits any errors from the graph or the transformers.
-  ///
-  /// This emits errors as they're detected. If an error occurs in one part of
-  /// the graph, unrelated parts will continue building.
-  ///
-  /// This will not emit programming errors from barback itself. Those will be
-  /// emitted through the [results] stream's error channel.
-  Stream get errors => _graph.errors;
-
-  /// The stream of [LogEntry] objects used to report transformer log entries.
-  ///
-  /// If this stream has listeners, then log entries will go to that.
-  /// Otherwise, a default logger will display them.
-  Stream<LogEntry> get log => _graph.log;
-
-  Barback(PackageProvider provider)
-      : _graph = new PackageGraph(provider);
-
-  /// Gets the asset identified by [id].
-  ///
-  /// If [id] is for a generated or transformed asset, this will wait until
-  /// it has been created and return it. If the asset cannot be found, throws
-  /// [AssetNotFoundException].
-  Future<Asset> getAssetById(AssetId id) {
-    return _graph.getAssetNode(id).then((node) {
-      if (node == null) throw new AssetNotFoundException(id);
-      return node.asset;
-    });
-  }
-
-  /// Adds [sources] to the graph's known set of source assets.
-  ///
-  /// Begins applying any transforms that can consume any of the sources. If a
-  /// given source is already known, it is considered modified and all
-  /// transforms that use it will be re-applied.
-  void updateSources(Iterable<AssetId> sources) =>
-      _graph.updateSources(sources);
-
-  /// Removes [removed] from the graph's known set of source assets.
-  void removeSources(Iterable<AssetId> removed) =>
-      _graph.removeSources(removed);
-
-  /// Gets all output assets.
-  ///
-  /// If a build is currently in progress, waits until it completes. The
-  /// returned future will complete with a [BarbackException] if the build is
-  /// not successful.
-  Future<AssetSet> getAllAssets() => _graph.getAllAssets();
-
-  /// Sets the transformer phases for [package]'s assets to [transformers].
-  ///
-  /// To the extent that [transformers] is similar to the previous transformer
-  /// phases for [package], the existing asset graph will be preserved.
-  ///
-  /// Elements of the inner iterable of [transformers] must be [Transformer]s,
-  /// [TransformerGroup]s, or [AggregateTransformer]s.
-  void updateTransformers(String package, Iterable<Iterable> transformers) =>
-      _graph.updateTransformers(package, transformers);
-}