Introduce emulatur launch dialog

Summary:
Changelog: Flipper can now launch iOS simulators by using `File > Launch Emulator...`

In the Sandy designs the device selector dropdown no longer shows the option to launch an emulator. So added a button to app inspect and the main menu instead.

I found it always a bit funny that we can launch android emulators, but not iOS emulators. Turns out that launching them is actually not very complex, so added capabilities to launch ios emulators

Reviewed By: jknoxville

Differential Revision: D24021737

fbshipit-source-id: c106cc2246921e008f9c808ebb811d8e333aa93b

desktop/app/src/dispatcher/iOSDevice.tsx

@@ -30,7 +30,13 @@ type iOSSimulatorDevice = {
   udid: string;
 };
 
-type IOSDeviceParams = {udid: string; type: DeviceType; name: string};
+export type IOSDeviceParams = {
+  udid: string;
+  type: DeviceType;
+  name: string;
+  deviceTypeIdentifier?: string;
+  state?: string;
+};
 
 const exec = promisify(child_process.exec);
 
@@ -79,7 +85,7 @@ if (typeof window !== 'undefined') {
 async function queryDevices(store: Store, logger: Logger): Promise<any> {
   return Promise.all([
     checkXcodeVersionMismatch(store),
-    getActiveSimulators().then((devices) => {
+    getSimulators(true).then((devices) => {
       processDevices(store, logger, devices, 'emulator');
     }),
     getActiveDevices(store.getState().settingsState.idbPath).then(
@@ -144,36 +150,50 @@ function processDevices(
   }
 }
 
-function getActiveSimulators(): Promise<Array<IOSDeviceParams>> {
-  const deviceSetPath = process.env.DEVICE_SET_PATH
+function getDeviceSetPath() {
+  return process.env.DEVICE_SET_PATH
     ? ['--set', process.env.DEVICE_SET_PATH]
     : [];
+}
+
+export function getSimulators(
+  bootedOnly: boolean,
+): Promise<Array<IOSDeviceParams>> {
   return promisify(execFile)(
     'xcrun',
-    ['simctl', ...deviceSetPath, 'list', 'devices', '--json'],
+    ['simctl', ...getDeviceSetPath(), 'list', 'devices', '--json'],
     {
       encoding: 'utf8',
     },
   )
     .then(({stdout}) => JSON.parse(stdout).devices)
     .then((simulatorDevices: Array<iOSSimulatorDevice>) => {
-      const simulators: Array<iOSSimulatorDevice> = Object.values(
-        simulatorDevices,
-      ).reduce((acc: Array<iOSSimulatorDevice>, cv) => acc.concat(cv), []);
-
+      const simulators = Object.values(simulatorDevices).flat();
       return simulators
         .filter(
-          (simulator) => simulator.state === 'Booted' && isAvailable(simulator),
+          (simulator) =>
+            (!bootedOnly || simulator.state === 'Booted') &&
+            isAvailable(simulator),
         )
         .map((simulator) => {
           return {
-            udid: simulator.udid,
+            ...simulator,
             type: 'emulator',
-            name: simulator.name,
           } as IOSDeviceParams;
         });
     })
-    .catch((_) => []);
+    .catch((e) => {
+      console.error(e);
+      return Promise.resolve([]);
+    });
+}
+
+export function launchSimulator(udid: string): Promise<any> {
+  return promisify(execFile)(
+    'xcrun',
+    ['simctl', ...getDeviceSetPath(), 'boot', udid],
+    {encoding: 'utf8'},
+  );
 }
 
 function getActiveDevices(idbPath: string): Promise<Array<IOSDeviceParams>> {
@@ -232,7 +252,7 @@ export async function getActiveDevicesAndSimulators(
   store: Store,
 ): Promise<Array<IOSDevice>> {
   const activeDevices: Array<Array<IOSDeviceParams>> = await Promise.all([
-    getActiveSimulators(),
+    getSimulators(true),
     getActiveDevices(store.getState().settingsState.idbPath),
   ]);
   const allDevices = activeDevices[0].concat(activeDevices[1]);