Make Source.getDirectory synchronous.

lib/src/command/list_package_dirs.dart

Index: lib/src/command/list_package_dirs.dart
diff --git a/lib/src/command/list_package_dirs.dart b/lib/src/command/list_package_dirs.dart
index fe3627258846ab8e2ba1f6b2adc40edf4a9cff43..34d695273701d45ac1338937ec0d0b844c2216aa 100644
--- a/lib/src/command/list_package_dirs.dart
+++ b/lib/src/command/list_package_dirs.dart
@@ -4,8 +4,6 @@
 
 library pub.command.list_package_dirs;
 
-import 'dart:async';
-
 import 'package:path/path.dart' as p;
 
 import '../command.dart';
@@ -26,7 +24,7 @@ class ListPackageDirsCommand extends PubCommand {
         allowed: ["json"]);
   }
 
-  Future run() {
+  void run() {
     log.json.enabled = true;
 
     if (!entrypoint.lockFileExists) {
@@ -36,23 +34,20 @@ class ListPackageDirsCommand extends PubCommand {
     var output = {};
 
     // Include the local paths to all locked packages.
-    var packages = {};
-    var futures = [];
-    entrypoint.lockFile.packages.forEach((name, package) {
+    var packages = mapMap(entrypoint.lockFile.packages, value: (name, package) {
       var source = entrypoint.cache.sources[package.source];
-      futures.add(source.getDirectory(package).then((packageDir) {
-        // Normalize paths and make them absolute for backwards compatibility
-        // with the protocol used by the analyzer.
-        packages[name] = p.normalize(p.absolute(p.join(packageDir, "lib")));
-      }));
+      var packageDir = source.getDirectory(package);
+      // Normalize paths and make them absolute for backwards compatibility
+      // with the protocol used by the analyzer.
+      return p.normalize(p.absolute(p.join(packageDir, "lib")));
     });
 
-    output["packages"] = packages;
-
     // Include the self link.
     packages[entrypoint.root.name] =
         p.normalize(p.absolute(entrypoint.root.path("lib")));
 
+    output["packages"] = packages;
+
     // Include the file(s) which when modified will affect the results. For pub,
     // that's just the pubspec and lockfile.
     output["input_files"] = [
@@ -60,9 +55,7 @@ class ListPackageDirsCommand extends PubCommand {
       p.normalize(p.absolute(entrypoint.pubspecPath))
     ];
 
-    return Future.wait(futures).then((_) {
-      log.json.message(output);
-    });
+    log.json.message(output);
   }
 }