send supportsRestart flag when starting an app (#4513)

* send supportsRestart flag when starting an app

* remove unused imports

* review comments

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

@@ -388,6 +388,9 @@ class AndroidDevice extends Device {
     );
   }
 
+  @override
+  bool get supportsRestart => true;
+
   @override
   Future<bool> restartApp(
     ApplicationPackage package,

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

@@ -284,7 +284,7 @@ class AppDomain extends Domain {
   Future<Map<String, dynamic>> start(Map<String, dynamic> args) async {
     String deviceId = _getStringArg(args, 'deviceId', required: true);
     String projectDirectory = _getStringArg(args, 'projectDirectory', required: true);
-    bool startPaused = _getBoolArg(args, 'startPaused');
+    bool startPaused = _getBoolArg(args, 'startPaused') ?? false;
     String route = _getStringArg(args, 'route');
     String mode = _getStringArg(args, 'mode');
     String target = _getStringArg(args, 'target');
@@ -325,8 +325,9 @@ class AppDomain extends Domain {
     AppInstance app = new AppInstance(_getNextAppId(), runner);
     _apps.add(app);
     _sendAppEvent(app, 'start', <String, dynamic>{
+      'deviceId': deviceId,
       'directory': projectDirectory,
-      'deviceId': deviceId
+      'supportsRestart': device.supportsRestart
     });
 
     Completer<int> observatoryPortCompleter;
@@ -349,7 +350,12 @@ class AppDomain extends Domain {
       });
     });
 
-    return <String, dynamic>{ 'appId': app.id };
+    return <String, dynamic>{
+      'appId': app.id,
+      'deviceId': deviceId,
+      'directory': projectDirectory,
+      'supportsRestart': device.supportsRestart
+    };
   }
 
   Future<bool> restart(Map<String, dynamic> args) async {
@@ -585,17 +591,18 @@ class _AppRunLogger extends Logger {
 
   AppDomain domain;
   final AppInstance app;
+  int _nextProgressId = 0;
 
   @override
   void printError(String message, [StackTrace stackTrace]) {
     if (stackTrace != null) {
-      domain?._sendAppEvent(app, 'log', <String, dynamic>{
+      _sendLogEvent(<String, dynamic>{
         'log': message,
         'stackTrace': stackTrace.toString(),
         'error': true
       });
     } else {
-      domain?._sendAppEvent(app, 'log', <String, dynamic>{
+      _sendLogEvent(<String, dynamic>{
         'log': message,
         'error': true
       });
@@ -604,7 +611,7 @@ class _AppRunLogger extends Logger {
 
   @override
   void printStatus(String message, { bool emphasis: false, bool newline: true }) {
-    domain?._sendAppEvent(app, 'log', <String, dynamic>{ 'log': message });
+    _sendLogEvent(<String, dynamic>{ 'log': message });
   }
 
   @override
@@ -612,13 +619,52 @@ class _AppRunLogger extends Logger {
 
   @override
   Status startProgress(String message) {
-    printStatus(message);
-    return new Status();
+    int id = _nextProgressId++;
+
+    _sendLogEvent(<String, dynamic>{
+      'log': message,
+      'progress': true,
+      'id': id.toString()
+    });
+
+    return new _AppLoggerStatus(this, id);
   }
 
   void close() {
     domain = null;
   }
+
+  void _sendLogEvent(Map<String, dynamic> event) {
+    if (domain == null)
+      printStatus('event sent after app closed: $event');
+    else
+      domain._sendAppEvent(app, 'log', event);
+  }
+}
+
+class _AppLoggerStatus implements Status {
+  _AppLoggerStatus(this.logger, this.id);
+
+  final _AppRunLogger logger;
+  final int id;
+
+  @override
+  void stop({ bool showElapsedTime: false }) {
+    _sendFinished();
+  }
+
+  @override
+  void cancel() {
+    _sendFinished();
+  }
+
+  void _sendFinished() {
+    logger._sendLogEvent(<String, dynamic>{
+      'progress': true,
+      'id': id.toString(),
+      'finished': true
+    });
+  }
 }
 
 class LogMessage {

packages/flutter_tools/lib/src/device.dart

@@ -189,6 +189,8 @@ abstract class Device {
     Map<String, dynamic> platformArgs
   });
 
+  bool get supportsRestart => false;
+
   /// Restart the given app; the application will already have been launched with
   /// [startApp].
   Future<bool> restartApp(
@@ -196,7 +198,9 @@ abstract class Device {
     LaunchResult result, {
     String mainPath,
     Observatory observatory
-  });
+  }) async {
+    throw 'unsupported';
+  }
 
   /// Stop an app package on the current device.
   Future<bool> stopApp(ApplicationPackage app);

packages/flutter_tools/lib/src/ios/devices.dart

@@ -12,7 +12,6 @@ import '../base/process.dart';
 import '../build_info.dart';
 import '../device.dart';
 import '../globals.dart';
-import '../observatory.dart';
 import 'mac.dart';
 
 const String _ideviceinstallerInstructions =
@@ -213,21 +212,6 @@ class IOSDevice extends Device {
     return new LaunchResult.succeeded();
   }
 
-  @override
-  Future<bool> restartApp(
-    ApplicationPackage package,
-    LaunchResult result, {
-    String mainPath,
-    Observatory observatory
-  }) async {
-    return observatory.isolateReload(observatory.firstIsolateId).then((Response response) {
-      return true;
-    }).catchError((dynamic error) {
-      printError('Error restarting app: $error');
-      return false;
-    });
-  }
-
   @override
   Future<bool> stopApp(ApplicationPackage app) async {
     // Currently we don't have a way to stop an app running on iOS.

packages/flutter_tools/lib/src/ios/simulators.dart

@@ -16,7 +16,6 @@ import '../build_info.dart';
 import '../device.dart';
 import '../flx.dart' as flx;
 import '../globals.dart';
-import '../observatory.dart';
 import '../protocol_discovery.dart';
 import 'mac.dart';
 
@@ -574,21 +573,6 @@ class IOSSimulator extends Device {
     return (await flx.build(precompiledSnapshot: true)) == 0;
   }
 
-  @override
-  Future<bool> restartApp(
-    ApplicationPackage package,
-    LaunchResult result, {
-    String mainPath,
-    Observatory observatory
-  }) {
-    return observatory.isolateReload(observatory.firstIsolateId).then((Response response) {
-      return true;
-    }).catchError((dynamic error) {
-      printError('Error restarting app: $error');
-      return false;
-    });
-  }
-
   @override
   Future<bool> stopApp(ApplicationPackage app) async {
     // Currently we don't have a way to stop an app running on iOS.
@@ -780,7 +764,7 @@ class _IOSSimulatorLogReader extends DeviceLogReader {
       if (_lastLine != null) {
         int repeat = int.parse(multi.group(1));
         repeat = math.max(0, math.min(100, repeat));
-        for (int i = 0; i < repeat; i++)
+        for (int i = 1; i < repeat; i++)
           _linesController.add(_lastLine);
       }
     } else {

packages/flutter_tools/lib/src/run.dart

@@ -243,8 +243,10 @@ class RunAndStayResident {
             // F1, help
             _printHelp();
           } else if (lower == 'r' || code == AnsiTerminal.KEY_F5) {
-            // F5, restart
-            restart();
+            if (device.supportsRestart) {
+              // F5, restart
+              restart();
+            }
           } else if (lower == 'q' || code == AnsiTerminal.KEY_F10) {
             // F10, exit
             _stopApp();
@@ -287,7 +289,8 @@ class RunAndStayResident {
   }
 
   void _printHelp() {
-    printStatus('Type "h" or F1 for help, "r" or F5 to restart the app, and "q", F10, or ctrl-c to quit.');
+    String restartText = device.supportsRestart ? ', "r" or F5 to restart the app,' : '';
+    printStatus('Type "h" or F1 for help$restartText and "q", F10, or ctrl-c to quit.');
   }
 
   void _stopLogger() {

packages/flutter_tools/templates/create/.atom/launches.tmpl/main.yaml.tmpl

@@ -5,5 +5,3 @@ path: lib/main.dart
 flutter:
   # The starting route for the app.
   route:
-  # Additional args for the flutter run command.
-  args: