fix(simulator): Boot orphan simulator

Fixes NativeScript/nativescript-cli#3324

Author: Fatme

lib/declarations.ts

@@ -28,6 +28,7 @@ interface IDevice {
 
 interface ISimctl {
 	launch(deviceId: string, applicationIdentifier: string): string;
+	boot(deviceId: string): void;
 	terminate(deviceId: string, appIdentifier: string): string;
 	install(deviceId: string, applicationPath: string): void;
 	uninstall(deviceId: string, applicationIdentifier: string, opts?: any): void;

lib/iphone-simulator-xcode-simctl.ts

@@ -230,6 +230,12 @@ export class XCodeSimctlSimulator extends IPhoneSimulatorNameGetter implements I
 				this.killSimulator();
 			}
 
+			// In case user closes simulator window but simulator app is still alive
+			if (!bootedDevice && this.isSimulatorAppRunning()) {
+				const defaultDevice = _.find(this.simctl.getDevices(), device => device.name === this.defaultDeviceIdentifier);
+				this.simctl.boot(defaultDevice.id);
+			}
+
 			common.startSimulator(device.id);
 			// startSimulaltor doesn't always finish immediately, and the subsequent
 			// install fails since the simulator is not running.
@@ -238,6 +244,15 @@ export class XCodeSimctlSimulator extends IPhoneSimulatorNameGetter implements I
 		}
 	}
 
+	private isSimulatorAppRunning() {
+		try {
+			const output = childProcess.execSync("ps cax | grep -w Simulator");
+			return output.indexOf('Simulator') !== -1;
+		} catch (e) {
+			return false;
+		}
+	}
+
 	private verifyDevice(device: IDevice): void {
 		const availableDevices = this.getDevices();
 		if (!_.find(availableDevices, { id: device.id })) {

lib/simctl.ts

@@ -28,6 +28,10 @@ export class Simctl implements ISimctl {
 		return result;
 	}
 
+	public boot(deviceId: string) {
+		return this.simctlExec("boot", [deviceId]);
+	}
+
 	public terminate(deviceId: string, appIdentifier: string): string {
 		return this.simctlExec("terminate", [deviceId, appIdentifier]);
 	}