Include the SDK version with "pub deps" (#1833)

Closes #1827

Author: nex3

lib/src/command/deps.dart

@@ -10,8 +10,10 @@ import 'package:path/path.dart' as p;
 import '../ascii_tree.dart' as tree;
 import '../command.dart';
 import '../dart.dart';
+import '../flutter.dart' as flutter;
 import '../log.dart' as log;
 import '../package.dart';
+import '../sdk.dart' as sdk;
 import '../utils.dart';
 
 /// Returns `true` if [path] looks like a Dart entrypoint.
@@ -64,6 +66,12 @@ class DepsCommand extends PubCommand {
     if (argResults['executables']) {
       _outputExecutables();
     } else {
+      _buffer.writeln("${log.bold('Dart SDK')} ${sdk.version}");
+
+      if (flutter.isAvailable) {
+        _buffer.writeln("${log.bold('Flutter SDK')} ${flutter.version}");
+      }
+
       _buffer.writeln(_labelPackage(entrypoint.root));
 
       switch (argResults["style"]) {

test/deps_test.dart

@@ -2,6 +2,7 @@
 // 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.
 
+import 'package:path/path.dart' as p;
 import 'package:test/test.dart';
 
 import 'descriptor.dart' as d;
@@ -46,6 +47,7 @@ main() {
     test("in compact form", () async {
       await pubGet();
       await runPub(args: ['deps', '-s', 'compact'], output: '''
+          Dart SDK 0.1.2+3
           myapp 0.0.0
 
           dependencies:
@@ -73,6 +75,7 @@ main() {
     test("in list form", () async {
       await pubGet();
       await runPub(args: ['deps', '--style', 'list'], output: '''
+          Dart SDK 0.1.2+3
           myapp 0.0.0
 
           dependencies:
@@ -106,9 +109,10 @@ main() {
           ''');
     });
 
-    test("lists dependencies in tree form", () async {
+    test("in tree form", () async {
       await pubGet();
       await runPub(args: ['deps'], output: '''
+          Dart SDK 0.1.2+3
           myapp 0.0.0
           |-- from_path 1.2.3
           |-- normal 1.2.3
@@ -126,12 +130,23 @@ main() {
                       '-- myapp...
           ''');
     });
+
+    test("with the Flutter SDK, if applicable", () async {
+      await pubGet();
+
+      await d.dir('flutter', [d.file('version', '4.3.2+1')]).create();
+      await runPub(
+          args: ['deps'],
+          output: contains('Flutter SDK 4.3.2+1'),
+          environment: {"FLUTTER_ROOT": p.join(d.sandbox, 'flutter')});
+    });
   });
 
   group("lists non-dev dependencies", () {
     test("in compact form", () async {
       await pubGet();
       await runPub(args: ['deps', '-s', 'compact', '--no-dev'], output: '''
+          Dart SDK 0.1.2+3
           myapp 0.0.0
 
           dependencies:
@@ -155,6 +170,7 @@ main() {
     test("in list form", () async {
       await pubGet();
       await runPub(args: ['deps', '--style', 'list', '--no-dev'], output: '''
+          Dart SDK 0.1.2+3
           myapp 0.0.0
 
           dependencies:
@@ -185,6 +201,7 @@ main() {
     test("in tree form", () async {
       await pubGet();
       await runPub(args: ['deps', '--no-dev'], output: '''
+          Dart SDK 0.1.2+3
           myapp 0.0.0
           |-- from_path 1.2.3
           |-- normal 1.2.3