Launch named iOS simulators (#72323)

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

@@ -142,7 +142,7 @@ class AndroidEmulator extends Emulator {
   Category get category => Category.mobile;
 
   @override
-  PlatformType get platformType => PlatformType.android;
+  String get platformDisplay => PlatformType.android.toString();
 
   String _prop(String name) => _properties != null ? _properties[name] : null;
 

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

@@ -933,7 +933,7 @@ Map<String, dynamic> _emulatorToMap(Emulator emulator) {
     'id': emulator.id,
     'name': emulator.name,
     'category': emulator.category?.toString(),
-    'platformType': emulator.platformType?.toString(),
+    'platformType': emulator.platformDisplay,
   };
 }
 

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

@@ -27,7 +27,7 @@ class EmulatorsCommand extends FlutterCommand {
   final String description = 'List, launch and create emulators.';
 
   @override
-  final List<String> aliases = <String>['emulator'];
+  final List<String> aliases = <String>['emulator', 'simulators', 'simulator'];
 
   @override
   Future<FlutterCommandResult> runCommand() async {

packages/flutter_tools/lib/src/device.dart

@@ -614,10 +614,6 @@ abstract class Device {
   /// Check if the device is supported by Flutter.
   bool isSupported();
 
-  // String meant to be displayed to the user indicating if the device is
-  // supported by Flutter, and, if not, why.
-  String supportMessage() => isSupported() ? 'Supported' : 'Unsupported';
-
   /// The device's platform.
   Future<TargetPlatform> get targetPlatform;
 

packages/flutter_tools/lib/src/emulator.dart

@@ -252,7 +252,7 @@ abstract class Emulator {
   String get name;
   String get manufacturer;
   Category get category;
-  PlatformType get platformType;
+  String get platformDisplay;
 
   @override
   int get hashCode => id.hashCode;
@@ -283,7 +283,7 @@ abstract class Emulator {
           emulator.id ?? '',
           emulator.name ?? '',
           emulator.manufacturer ?? '',
-          emulator.platformType?.toString() ?? '',
+          emulator.platformDisplay ?? '',
         ],
     ];
 

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

@@ -16,17 +16,26 @@ class IOSEmulators extends EmulatorDiscovery {
   bool get canListAnything => globals.iosWorkflow.canListEmulators;
 
   @override
-  Future<List<Emulator>> get emulators async => getEmulators();
+  Future<List<Emulator>> get emulators async {
+    final List<IOSSimulator> simulators = await globals.iosSimulatorUtils.getAvailableDevices();
+    return simulators.map<Emulator>((IOSSimulator device) {
+      return IOSEmulator(device);
+    }).toList();
+  }
 
   @override
   bool get canLaunchAnything => canListAnything;
 }
 
 class IOSEmulator extends Emulator {
-  const IOSEmulator(String id) : super(id, true);
+  IOSEmulator(IOSSimulator simulator)
+      : _simulator = simulator,
+        super(simulator.id, true);
+
+  final IOSSimulator _simulator;
 
   @override
-  String get name => 'iOS Simulator';
+  String get name => _simulator.name;
 
   @override
   String get manufacturer => 'Apple';
@@ -35,43 +44,20 @@ class IOSEmulator extends Emulator {
   Category get category => Category.mobile;
 
   @override
-  PlatformType get platformType => PlatformType.ios;
+  String get platformDisplay =>
+      // com.apple.CoreSimulator.SimRuntime.iOS-10-3 => iOS-10-3
+      _simulator.simulatorCategory?.split('.')?.last ?? 'ios';
 
   @override
   Future<void> launch() async {
-    Future<bool> launchSimulator(List<String> additionalArgs) async {
-      final List<String> args = <String>[
-        'open',
-        ...additionalArgs,
-        '-a',
-        globals.xcode.getSimulatorPath(),
-      ];
-
-      final RunResult launchResult = await globals.processUtils.run(args);
-      if (launchResult.exitCode != 0) {
-        globals.printError('$launchResult');
-        return false;
-      }
-      return true;
-    }
-
-    // First run with `-n` to force a device to boot if there isn't already one
-    if (!await launchSimulator(<String>['-n'])) {
-      return;
+    final RunResult launchResult = await globals.processUtils.run(<String>[
+      'open',
+      '-a',
+      globals.xcode.getSimulatorPath(),
+    ]);
+    if (launchResult.exitCode != 0) {
+      globals.printError('$launchResult');
     }
-
-    // Run again to force it to Foreground (using -n doesn't force existing
-    // devices to the foreground)
-    await launchSimulator(<String>[]);
+    return _simulator.boot();
   }
 }
-
-/// Return the list of iOS Simulators (there can only be zero or one).
-List<IOSEmulator> getEmulators() {
-  final String simulatorPath = globals.xcode.getSimulatorPath();
-  if (simulatorPath == null) {
-    return <IOSEmulator>[];
-  }
-
-  return <IOSEmulator>[const IOSEmulator(iosSimulatorId)];
-}

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

@@ -66,7 +66,9 @@ class IOSSimulatorUtils {
       return <IOSSimulator>[];
     }
 
-    final List<SimDevice> connected = await _simControl.getConnectedDevices();
+    final List<SimDevice> connected = (await _simControl.getAvailableDevices())
+        .where((SimDevice device) => device.isBooted)
+        .toList();
     return connected.map<IOSSimulator>((SimDevice device) {
       return IOSSimulator(
         device.udid,
@@ -77,6 +79,26 @@ class IOSSimulatorUtils {
       );
     }).toList();
   }
+
+  Future<List<IOSSimulator>> getAvailableDevices() async {
+    if (!_xcode.isInstalledAndMeetsVersionCheck) {
+      return <IOSSimulator>[];
+    }
+
+    final List<SimDevice> available = await _simControl.getAvailableDevices();
+    return available
+        .map<IOSSimulator>((SimDevice device) {
+          return IOSSimulator(
+            device.udid,
+            name: device.name,
+            simControl: _simControl,
+            simulatorCategory: device.category,
+            xcode: _xcode,
+          );
+        })
+        .where((IOSSimulator simulator) => simulator.isSupported())
+        .toList();
+  }
 }
 
 /// A wrapper around the `simctl` command line tool.
@@ -89,6 +111,23 @@ class SimControl {
         _xcode = xcode,
         _processUtils = ProcessUtils(processManager: processManager, logger: logger);
 
+  /// Create a [SimControl] for testing.
+  ///
+  /// Defaults to a buffer logger.
+  @visibleForTesting
+  factory SimControl.test({
+    @required ProcessManager processManager,
+    Logger logger,
+    Xcode xcode,
+  }) {
+    logger ??= BufferLogger.test();
+    return SimControl(
+      logger: logger,
+      xcode: xcode,
+      processManager: processManager,
+    );
+  }
+
   final Logger _logger;
   final ProcessUtils _processUtils;
   final Xcode _xcode;
@@ -160,10 +199,10 @@ class SimControl {
     return devices;
   }
 
-  /// Returns all the connected simulator devices.
-  Future<List<SimDevice>> getConnectedDevices() async {
+  /// Returns all the available simulator devices.
+  Future<List<SimDevice>> getAvailableDevices() async {
     final List<SimDevice> simDevices = await getDevices();
-    return simDevices.where((SimDevice device) => device.isBooted).toList();
+    return simDevices.where((SimDevice device) => device.isAvailable).toList();
   }
 
   Future<bool> isInstalled(String deviceId, String appId) {
@@ -234,6 +273,17 @@ class SimControl {
     return result;
   }
 
+  Future<RunResult> boot(String deviceId) {
+    return _processUtils.run(
+      <String>[
+        ..._xcode.xcrunCommand(),
+        'simctl',
+        'boot',
+        deviceId,
+      ],
+    );
+  }
+
   Future<void> takeScreenshot(String deviceId, String outputPath) async {
     try {
       await _processUtils.run(
@@ -296,7 +346,11 @@ class SimDevice {
   final Map<String, dynamic> data;
 
   String get state => data['state']?.toString();
-  String get availability => data['availability']?.toString();
+
+  bool get isAvailable =>
+      data['isAvailable'] == true ||
+      data['availability']?.toString() == '(available)';
+
   String get name => data['name']?.toString();
   String get udid => data['udid']?.toString();
 
@@ -394,29 +448,32 @@ class IOSSimulator extends Device {
   @override
   bool isSupported() {
     if (!globals.platform.isMacOS) {
-      _supportMessage = 'iOS devices require a Mac host machine.';
       return false;
     }
 
     // Check if the device is part of a blocked category.
     // We do not yet support WatchOS or tvOS devices.
     final RegExp blocklist = RegExp(r'Apple (TV|Watch)', caseSensitive: false);
     if (blocklist.hasMatch(name)) {
-      _supportMessage = 'Flutter does not support Apple TV or Apple Watch.';
       return false;
     }
     return true;
   }
 
-  String _supportMessage;
+  Future<bool> boot() async {
+    final RunResult result = await _simControl.boot(id);
 
-  @override
-  String supportMessage() {
-    if (isSupported()) {
-      return 'Supported';
+    if (result.exitCode == 0) {
+      return true;
+    }
+    // 149 exit code means the device is already booted. Ignore this error.
+    if (result.exitCode == 149) {
+      globals.printTrace('Simulator "$id" already booted.');
+      return true;
     }
 
-    return _supportMessage ?? 'Unknown';
+    globals.logger.printError('$result');
+    return false;
   }
 
   @override

packages/flutter_tools/test/general.shard/android/android_emulator_test.dart

@@ -71,7 +71,7 @@ void main() {
       expect(emulator.name, displayName);
       expect(emulator.manufacturer, manufacturer);
       expect(emulator.category, Category.mobile);
-      expect(emulator.platformType, PlatformType.android);
+      expect(emulator.platformDisplay, 'android');
     });
 
     testWithoutContext('prefers displayname for name', () {