Rerun "pub list" when pubspec.lock changes.

pkg/analysis_server/lib/src/package_map_provider.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 package.map.provider;
 
 import 'dart:convert';
 import 'dart:io' as io;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/resource.dart';
 import 'package:analyzer/src/generated/engine.dart';
 
 /**
  * A PackageMapProvider is an entity capable of determining the mapping from
  * package name to source directory for a given folder.
  */
 abstract class PackageMapProvider {
   /**
    * Compute a package map for the given folder, if possible.
    *
    * If a package map can't be computed, return null.
    */
-  Map<String, List<Folder>> computePackageMap(Folder folder);
+  PackageMapInfo computePackageMap(Folder folder);
 }
 
 /**
+ * Data structure output by PackageMapProvider.  This contains both the package
+ * map and dependency information.
+ */
+class PackageMapInfo {
+  /**
+   * The package map itself.  This is a map from package name to a list of
+   * the folders containing source code for the package.
+   */
+  Map<String, List<Folder>> packageMap;
+
+  /**
+   * Dependency information.  This is a set of the paths which were consulted
+   * in order to generate the package map.  If any of these files is
+   * modified, the package map will need to be regenerated.
+   */
+  Set<String> dependencies;
+
+  PackageMapInfo(this.packageMap, this.dependencies);
+}
+
+/**
  * Implementation of PackageMapProvider that operates by executing pub.
  */
 class PubPackageMapProvider implements PackageMapProvider {
   static const String PUB_LIST_COMMAND = 'list-package-dirs';
 
   /**
    * [ResourceProvider] that is used to create the [Folder]s that populate the
    * package map.
    */
   final ResourceProvider resourceProvider;
 
   PubPackageMapProvider(this.resourceProvider);
 
   @override
-  Map<String, List<Folder>> computePackageMap(Folder folder) {
+  PackageMapInfo computePackageMap(Folder folder) {
     // TODO(paulberry) make this asynchronous so that we can (a) do other
     // analysis while it's in progress, and (b) time out if it takes too long
     // to respond.
     String executable = SHARED_SDK.pubExecutable.getAbsolutePath();
     io.ProcessResult result;
     try {
       result = io.Process.runSync(
           executable, [PUB_LIST_COMMAND], workingDirectory: folder.path);
     } on io.ProcessException catch (exception, stackTrace) {
       AnalysisEngine.instance.logger.logInformation(
@@ skipping 10 matching lines @@
       AnalysisEngine.instance.logger.logError(
           "Malformed output from pub $PUB_LIST_COMMAND\n${exception}\n${stackTrace}");
     }
 
     return null;
   }
 
   /**
    * Decode the JSON output from pub into a package map.
    */
-  Map<String, List<Folder>> parsePackageMap(String jsonText) {
+  PackageMapInfo parsePackageMap(String jsonText) {
     // The output of pub looks like this:
     // {
     //   "packages": {
     //     "foo": "path/to/foo",
     //     "bar": ["path/to/bar1", "path/to/bar2"],
     //     "myapp": "path/to/myapp",  // self link is included
     //   },
     //   "input_files": [
     //     "path/to/myapp/pubspec.lock"
     //   ]
@@ skipping 15 matching lines @@
         packageMap[packageName] = folders;
       }
     }
     packages.forEach((key, value) {
       if (value is String) {
         processPaths(key, [value]);
       } else if (value is List) {
         processPaths(key, value);
       }
     });
-    return packageMap;
+    Set<String> dependencies = new Set<String>();
+    List inputFiles = obj['input_files'];
+    if (inputFiles != null) {
+      for (var path in inputFiles) {
+        if (path is String) {
+          dependencies.add(path);
+        }
+      }
+    }
+    return new PackageMapInfo(packageMap, dependencies);
   }
 }