Don't add files inside "packages" subdir to context.

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 'package:analysis_server/src/resource.dart';
 import 'package:analyzer/src/generated/engine.dart';
@@ skipping 82 matching lines @@
       addContext(folder, pubspecFile.exists ? pubspecFile : null);
       ChangeSet changeSet = new ChangeSet();
       _addSourceFiles(changeSet, folder, info);
       applyChangesToContext(folder, changeSet);
     }
   }
 
   void _handleWatchEvent(Folder folder, _ContextDirectoryInfo info, WatchEvent event) {
     switch (event.type) {
       case ChangeType.ADD:
+        if (_isInPackagesDir(event.path, folder)) {
+          // TODO(paulberry): perhaps we should only skip packages dirs if
+          // there is a pubspec.yaml?
+          break;
+        }
         // TODO(paulberry): handle adding pubspec.yaml
         if (_shouldFileBeAnalyzed(event.path)) {
           ChangeSet changeSet = new ChangeSet();
           Resource resource = resourceProvider.getResource(event.path);
           // If the file went away and was replaced by a folder before we
           // had a chance to process the event, resource might be a Folder.  In
           // that case don't add it.
           if (resource is File) {
             File file = resource;
             Source source = file.createSource(UriKind.FILE_URI);
@@ skipping 13 matching lines @@
           info.sources.remove(event.path);
         }
         break;
       case ChangeType.MODIFY:
         // TODO(paulberry): handle modification events
         break;
     }
   }
 
   /**
+   * 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++) {
+      if (pathParts[i] == 'packages') {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  /**
    * Resursively adds all Dart and HTML files to the [changeSet].
    */
   static void _addSourceFiles(ChangeSet changeSet, Folder folder, _ContextDirectoryInfo info) {
     List<Resource> children = folder.getChildren();
     for (Resource child in children) {
       if (child is File) {
         if (_shouldFileBeAnalyzed(child.path)) {
           Source source = child.createSource(UriKind.FILE_URI);
           changeSet.addedSource(source);
           info.sources[child.path] = source;
         }
       } else if (child is Folder) {
+        if (child.shortName == 'packages') {
+          // TODO(paulberry): perhaps we should only skip packages dirs if
+          // there is a pubspec.yaml?
+          continue;
+        }
         _addSourceFiles(changeSet, child, info);
       }
     }
   }
 
   static bool _shouldFileBeAnalyzed(String path) {
     return AnalysisEngine.isDartFileName(path)
             || AnalysisEngine.isHtmlFileName(path);
   }
 
   /**
    * Called when a new context needs to be created.  If the context is
    * associated with a pubspec file, that file is passed in [pubspecFile];
    * otherwise it is null.
    */
   void addContext(Folder folder, File pubspecFile);
 
   /**
    * 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);
 }