[flutter_tools] flutter run should allow exit when make choose for devices. (#64403)

packages/flutter_tools/lib/src/base/terminal.dart

@@ -285,6 +285,7 @@ class AnsiTerminal implements Terminal {
         if (displayAcceptedCharacters) {
           logger.printStatus(' [${charactersToDisplay.join("|")}]', newline: false);
         }
+        // prompt ends with ': '
         logger.printStatus(': ', emphasis: true, newline: false);
       }
       choice = await keystrokes.first;

packages/flutter_tools/lib/src/base/user_messages.dart

@@ -256,7 +256,7 @@ class UserMessages {
       'Found $count devices with name or id matching $deviceId:';
   String get flutterMultipleDevicesFound => 'Multiple devices found:';
   String flutterChooseDevice(int option, String name, String deviceId) => '[$option]: $name ($deviceId)';
-  String get flutterChooseOne => 'Please choose one:';
+  String get flutterChooseOne => 'Please choose one (To quit, press "q/Q")';
   String get flutterSpecifyDeviceWithAllOption =>
       'More than one device connected; please specify a device with '
       "the '-d <deviceId>' flag, or use '-d all' to act on all devices.";

packages/flutter_tools/lib/src/device.dart

@@ -14,6 +14,7 @@ import 'android/android_sdk.dart';
 import 'android/android_workflow.dart';
 import 'application_package.dart';
 import 'artifacts.dart';
+import 'base/common.dart';
 import 'base/config.dart';
 import 'base/context.dart';
 import 'base/dds.dart';
@@ -283,6 +284,9 @@ abstract class DeviceManager {
   Future<Device> _chooseOneOfAvailableDevices(List<Device> devices) async {
     _displayDeviceOptions(devices);
     final String userInput =  await _readUserInput(devices.length);
+    if (userInput.toLowerCase() == 'q') {
+      throwToolExit('');
+    }
     return devices[int.parse(userInput)];
   }
 
@@ -297,7 +301,8 @@ abstract class DeviceManager {
   Future<String> _readUserInput(int deviceCount) async {
     globals.terminal.usesTerminalUi = true;
     final String result = await globals.terminal.promptForCharInput(
-        <String>[ for (int i = 0; i < deviceCount; i++) '$i' ],
+        <String>[ for (int i = 0; i < deviceCount; i++) '$i', 'q', 'Q'],
+        displayAcceptedCharacters: false,
         logger: globals.logger,
         prompt: userMessages.flutterChooseOne);
     return result;

packages/flutter_tools/test/general.shard/device_test.dart

@@ -4,6 +4,7 @@
 
 import 'dart:async';
 
+import 'package:flutter_tools/src/base/common.dart';
 import 'package:flutter_tools/src/base/logger.dart';
 import 'package:flutter_tools/src/base/terminal.dart';
 import 'package:flutter_tools/src/artifacts.dart';
@@ -208,7 +209,8 @@ void main() {
       ];
 
       when(mockStdio.stdinHasTerminal).thenReturn(true);
-      when(globals.terminal.promptForCharInput(<String>['0', '1'],
+      when(globals.terminal.promptForCharInput(<String>['0', '1', 'q', 'Q'],
+      displayAcceptedCharacters: false,
       logger: globals.logger,
       prompt: globals.userMessages.flutterChooseOne)
       ).thenAnswer((Invocation invocation) async => '0');
@@ -232,7 +234,8 @@ void main() {
       ];
 
       when(mockStdio.stdinHasTerminal).thenReturn(true);
-      when(globals.terminal.promptForCharInput(<String>['0', '1'],
+      when(globals.terminal.promptForCharInput(<String>['0', '1', 'q', 'Q'],
+          displayAcceptedCharacters: false,
           logger: globals.logger,
       prompt: globals.userMessages.flutterChooseOne)
       ).thenAnswer((Invocation invocation) async => '1');
@@ -256,7 +259,8 @@ void main() {
       ];
 
       when(mockStdio.stdinHasTerminal).thenReturn(true);
-      when(globals.terminal.promptForCharInput(<String>['0', '1'],
+      when(globals.terminal.promptForCharInput(<String>['0', '1', 'q', 'Q'],
+          displayAcceptedCharacters: false,
           logger: globals.logger,
         prompt: globals.userMessages.flutterChooseOne)
       ).thenAnswer((Invocation invocation) async => '0');
@@ -280,7 +284,8 @@ void main() {
       ];
 
       when(mockStdio.stdinHasTerminal).thenReturn(true);
-      when(globals.terminal.promptForCharInput(<String>['0', '1'],
+      when(globals.terminal.promptForCharInput(<String>['0', '1', 'q', 'Q'],
+          displayAcceptedCharacters: false,
           logger: globals.logger,
         prompt: globals.userMessages.flutterChooseOne)
       ).thenAnswer((Invocation invocation) async => '1');
@@ -307,7 +312,8 @@ void main() {
       ];
 
       when(mockStdio.stdinHasTerminal).thenReturn(true);
-      when(globals.terminal.promptForCharInput(<String>['0', '1', '2', '3'],
+      when(globals.terminal.promptForCharInput(<String>['0', '1', '2', '3', 'q', 'Q'],
+        displayAcceptedCharacters: false,
         logger: globals.logger,
         prompt: globals.userMessages.flutterChooseOne)
       ).thenAnswer((Invocation invocation) async => '2');
@@ -325,6 +331,33 @@ void main() {
       Cache: () => cache,
     });
 
+    testUsingContext('exit from choose one of available devices', () async {
+      final List<Device> devices = <Device>[
+        ephemeralOne,
+        ephemeralTwo,
+      ];
+
+      when(mockStdio.stdinHasTerminal).thenReturn(true);
+      when(globals.terminal.promptForCharInput(<String>['0', '1', 'q', 'Q'],
+          displayAcceptedCharacters: false,
+          logger: globals.logger,
+          prompt: globals.userMessages.flutterChooseOne)
+      ).thenAnswer((Invocation invocation) async => 'q');
+
+      try {
+        final DeviceManager deviceManager = TestDeviceManager(devices);
+        await deviceManager.findTargetDevices(FlutterProject.current());
+      } on ToolExit catch (e) {
+        expect(e.exitCode, null);
+        expect(e.message, '');
+      }
+    }, overrides: <Type, Generator>{
+      Stdio: () => mockStdio,
+      AnsiTerminal: () => MockTerminal(),
+      Artifacts: () => Artifacts.test(),
+      Cache: () => cache,
+    });
+
     testUsingContext('Removes a single unsupported device', () async {
       final List<Device> devices = <Device>[
         unsupported,