add a --machine mode to flutter config (#11112)

* add a --machine mode to flutter config

* review feedback

packages/flutter_tools/lib/executable.dart

@@ -68,7 +68,7 @@ Future<Null> main(List<String> args) async {
     new AnalyzeCommand(verboseHelp: verboseHelp),
     new BuildCommand(verboseHelp: verboseHelp),
     new ChannelCommand(),
-    new ConfigCommand(),
+    new ConfigCommand(verboseHelp: verboseHelp),
     new CreateCommand(),
     new DaemonCommand(hidden: !verboseHelp),
     new DevicesCommand(),

packages/flutter_tools/lib/src/android/android_studio.dart

@@ -128,7 +128,9 @@ class AndroidStudio implements Comparable<AndroidStudio> {
             .listSync()
             .where((FileSystemEntity e) => e is Directory);
         for (Directory directory in directories) {
-          if (directory.basename == 'Android Studio.app') {
+          final String name = directory.basename;
+          // An exact match, or something like 'Android Studio 3.0 Preview.app'.
+          if (name.startsWith('Android Studio') && name.endsWith('.app')) {
             candidatePaths.add(directory);
           } else if (!directory.path.endsWith('.app')) {
             _checkForStudio(directory.path);

packages/flutter_tools/lib/src/commands/analyze.dart

@@ -23,7 +23,7 @@ class AnalyzeCommand extends FlutterCommand {
     argParser.addOption('dart-sdk', valueHelp: 'path-to-sdk', help: 'The path to the Dart SDK.', hide: !verboseHelp);
 
     // Hidden option to enable a benchmarking mode.
-    argParser.addFlag('benchmark', negatable: false, hide: !verboseHelp, help: 'Also output the analysis time');
+    argParser.addFlag('benchmark', negatable: false, hide: !verboseHelp, help: 'Also output the analysis time.');
 
     usesPubOption();
 

packages/flutter_tools/lib/src/commands/config.dart

@@ -3,23 +3,27 @@
 // found in the LICENSE file.
 
 import 'dart:async';
+import 'dart:convert';
 
+import '../android/android_studio.dart';
 import '../globals.dart';
 import '../runner/flutter_command.dart';
 import '../usage.dart';
 
 class ConfigCommand extends FlutterCommand {
-  ConfigCommand() {
+  ConfigCommand({ bool verboseHelp: false }) {
     argParser.addFlag('analytics',
       negatable: true,
       help: 'Enable or disable reporting anonymously tool usage statistics and crash reports.');
-    argParser.addFlag(
-      'clear-ios-signing-cert',
+    argParser.addFlag('clear-ios-signing-cert',
       negatable: false,
-      help: 'Clear the saved development certificate choice used to sign apps for iOS device deployment'
-    );
+      help: 'Clear the saved development certificate choice used to sign apps for iOS device deployment.');
     argParser.addOption('gradle-dir', help: 'The gradle install directory.');
     argParser.addOption('android-studio-dir', help: 'The Android Studio install directory.');
+    argParser.addFlag('machine',
+      negatable: false,
+      hide: !verboseHelp,
+      help: 'Pring config values as json.');
   }
 
   @override
@@ -53,6 +57,9 @@ class ConfigCommand extends FlutterCommand {
 
   @override
   Future<Null> runCommand() async {
+    if (argResults['machine'])
+      return handleMachine();
+
     if (argResults.wasParsed('analytics')) {
       final bool value = argResults['analytics'];
       flutterUsage.enabled = value;
@@ -72,6 +79,21 @@ class ConfigCommand extends FlutterCommand {
       printStatus(usage);
   }
 
+  Future<Null> handleMachine() async {
+    // Get all the current values.
+    final Map<String, dynamic> results = <String, dynamic>{};
+    for (String key in config.keys) {
+      results[key] = config.getValue(key);
+    }
+
+    // Ensure we send any calculated ones, if overrides don't exist.
+    if (results['android-studio-dir'] == null && androidStudio != null) {
+      results['android-studio-dir'] = androidStudio.directory;
+    }
+
+    printStatus(JSON.encode(results));
+  }
+
   void _updateConfig(String keyName, String keyValue) {
     if (keyValue.isEmpty) {
       config.removeValue(keyName);

packages/flutter_tools/test/config_test.dart

@@ -2,17 +2,28 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'dart:convert';
+
+import 'package:flutter_tools/src/android/android_studio.dart';
 import 'package:flutter_tools/src/base/config.dart';
+import 'package:flutter_tools/src/base/context.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
+import 'package:flutter_tools/src/base/logger.dart';
+import 'package:flutter_tools/src/commands/config.dart';
+import 'package:mockito/mockito.dart';
 import 'package:test/test.dart';
 
+import 'src/context.dart';
+
 void main() {
   Config config;
+  MockAndroidStudio mockAndroidStudio;
 
   setUp(() {
-    final Directory tempDiretory = fs.systemTempDirectory.createTempSync('flutter_test');
-    final File file = fs.file(fs.path.join(tempDiretory.path, '.settings'));
+    final Directory tempDirectory = fs.systemTempDirectory.createTempSync('flutter_test');
+    final File file = fs.file(fs.path.join(tempDirectory.path, '.settings'));
     config = new Config(file);
+    mockAndroidStudio = new MockAndroidStudio();
   });
 
   group('config', () {
@@ -32,5 +43,24 @@ void main() {
       expect(config.getValue('foo'), null);
       expect(config.keys, isNot(contains('foo')));
     });
+
+    testUsingContext('machine flag', () async {
+      final BufferLogger logger = context[Logger];
+      final ConfigCommand command = new ConfigCommand();
+      await command.handleMachine();
+
+      expect(logger.statusText, isNotEmpty);
+      final dynamic json = JSON.decode(logger.statusText);
+      expect(json, isMap);
+      expect(json.containsKey('android-studio-dir'), true);
+      expect(json['android-studio-dir'], isNotNull);
+    }, overrides: <Type, Generator>{
+      AndroidStudio: () => mockAndroidStudio,
     });
+  });
+}
+
+class MockAndroidStudio extends Mock implements AndroidStudio, Comparable<AndroidStudio> {
+  @override
+  String get directory => 'path/to/android/stdio';
 }