Rerun "pub list" when pubspec.lock changes.

pkg/analysis_server/lib/src/context_directory_manager.dart

 // Copyright (c) 2014, 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 context.directory.manager;
 
 import 'dart:async';
 import 'dart:collection';
 
+import 'package:analysis_server/src/package_map_provider.dart';
 import 'package:analysis_server/src/resource.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:watcher/watcher.dart';
 
 /**
  * Information tracked by the [ContextDirectoryManager] for each context.
  */
 class _ContextDirectoryInfo {
   /**
    * Stream subscription we are using to watch the context's directory for
    * changes.
    */
   StreamSubscription<WatchEvent> changeSubscription;
 
   /**
    * Map from full path to the [Source] object, for each source that has been
    * added to the context.
    */
   Map<String, Source> sources = new HashMap<String, Source>();
+
+  /**
+   * Dependencies of the context's package map.  If any of these files changes,
+   * the package map needs to be recomputed.
+   */
+  Set<String> packageMapDependencies;
 }
 
 /**
  * Class that maintains a mapping from included/excluded paths to a set of
  * folders that should correspond to analysis contexts.
  */
 abstract class ContextDirectoryManager {
   /**
    * File name of pubspec files.
    */
   static const String PUBSPEC_NAME = 'pubspec.yaml';
 
   /**
    * [_ContextDirectoryInfo] object for each included directory in the most
    * recent successful call to [setRoots].
    */
   Map<Folder, _ContextDirectoryInfo> _currentDirectoryInfo =
       new HashMap<Folder, _ContextDirectoryInfo>();
 
   /**
    * The [ResourceProvider] using which paths are converted into [Resource]s.
    */
   final ResourceProvider resourceProvider;
 
-  ContextDirectoryManager(this.resourceProvider);
+  /**
+   * Provider which is used to determine the mapping from package name to
+   * package folder.
+   */
+  final PackageMapProvider packageMapProvider;
+
+  ContextDirectoryManager(this.resourceProvider, this.packageMapProvider);
 
   /**
    * Change the set of paths which should be used as starting points to
    * determine the context directories.
    */
   void setRoots(List<String> includedPaths,
                 List<String> excludedPaths) {
     // included
     Set<Folder> includedFolders = new HashSet<Folder>();
     for (int i = 0; i < includedPaths.length; i++) {
@@ skipping 32 matching lines @@
   /**
    * Create a new context associated with the given folder.
    */
   void _createContext(Folder folder) {
     _ContextDirectoryInfo info = new _ContextDirectoryInfo();
     _currentDirectoryInfo[folder] = info;
     info.changeSubscription = folder.changes.listen((WatchEvent event) {
       _handleWatchEvent(folder, info, event);
     });
     File pubspecFile = folder.getChild(PUBSPEC_NAME);
-    addContext(folder);
+    PackageMapInfo packageMapInfo = packageMapProvider.computePackageMap(folder);
+    info.packageMapDependencies = packageMapInfo.dependencies;
+    // TODO(paulberry): if any of the dependencies is outside of [folder],
+    // we'll need to watch their parent folders as well.
+    addContext(folder, packageMapInfo.packageMap);
     ChangeSet changeSet = new ChangeSet();
     _addSourceFiles(changeSet, folder, info);
     applyChangesToContext(folder, changeSet);
   }
 
   /**
    * Clean up and destroy the context associated with the given folder.
    */
   void _destroyContext(Folder folder) {
     _currentDirectoryInfo[folder].changeSubscription.cancel();
@@ skipping 35 matching lines @@
         break;
       case ChangeType.MODIFY:
         Source source = info.sources[event.path];
         if (source != null) {
           ChangeSet changeSet = new ChangeSet();
           changeSet.changedSource(source);
           applyChangesToContext(folder, changeSet);
         }
         break;
     }
+
+    if (info.packageMapDependencies.contains(event.path)) {
+      // TODO(paulberry): when computePackageMap is changed into an
+      // asynchronous API call, we'll want to suspend analysis for this context
+      // while we're rerunning "pub list", since any analysis we complete while
+      // "pub list" is in progress is just going to get thrown away anyhow.
+      PackageMapInfo packageMapInfo = packageMapProvider.computePackageMap(folder);
+      info.packageMapDependencies = packageMapInfo.dependencies;
+      updateContextPackageMap(folder, packageMapInfo.packageMap);
+    }
   }
 
   /**
    * Determine if the path from [folder] to [path] contains a 'packages'
    * directory.
    */
   bool _isInPackagesDir(String path, Folder folder) {
     String relativePath = resourceProvider.pathContext.relative(path, from: folder.path);
     List<String> pathParts = resourceProvider.pathContext.split(relativePath);
     for (int i = 0; i < pathParts.length - 1; i++) {
@@ skipping 28 matching lines @@
   }
 
   static bool _shouldFileBeAnalyzed(String path) {
     return AnalysisEngine.isDartFileName(path)
             || AnalysisEngine.isHtmlFileName(path);
   }
 
   /**
    * Called when a new context needs to be created.
    */
-  void addContext(Folder folder);
+  void addContext(Folder folder, Map<String, List<Folder>> packageMap);
 
   /**
    * Called when the set of files associated with a context have changed (or
    * some of those files have been modified).  [changeSet] is the set of
    * changes that need to be applied to the context.
    */
   void applyChangesToContext(Folder contextFolder, ChangeSet changeSet);
 
   /**
    * Remove the context associated with the given [folder].
    */
   void removeContext(Folder folder);
+
+  /**
+   * Called when the package map for a context has changed.
+   */
+  void updateContextPackageMap(Folder contextFolder,
+                               Map<String, List<Folder>> packageMap);
 }