Fix doctor command output

In case gradle is not setup correctly or some of the required Android Tools are missing, `tns doctor` command show the warnings, but at the end a "No issues detected" message is shown. Make sure to prevent such message when there are issues by modifying validateInfo's return type to boolean and use it in doctor service.

Author: rosen-vladimirov

lib/android-tools-info.ts

@@ -39,8 +39,9 @@ export class AndroidToolsInfo implements IAndroidToolsInfo {
 		}).future<IAndroidToolsInfoData>()();
 	}
 
-	public validateInfo(options?: {showWarningsAsErrors: boolean, validateTargetSdk: boolean}): IFuture<void> {
-		return (() => {
+	public validateInfo(options?: {showWarningsAsErrors: boolean, validateTargetSdk: boolean}): IFuture<boolean> {
+		return (() : boolean => {
+			let detectedErrors = false;
 			this.showWarningsAsErrors = options && options.showWarningsAsErrors;
 			let toolsInfoData = this.getToolsInfo().wait();
 			if(!toolsInfoData.androidHomeEnvVar || !this.$fs.exists(toolsInfoData.androidHomeEnvVar).wait()) {
@@ -51,6 +52,7 @@ export class AndroidToolsInfo implements IAndroidToolsInfo {
 			if(!toolsInfoData.compileSdkVersion) {
 				this.printMessage(`Cannot find a compatible Android SDK for compilation. To be able to build for Android, install Android SDK ${AndroidToolsInfo.MIN_REQUIRED_COMPILE_TARGET} or later.`,
 							"Run `$ android` to manage your Android SDK versions.");
+				detectedErrors = true;
 			}
 
 			if(!toolsInfoData.buildToolsVersion) {
@@ -65,11 +67,13 @@ export class AndroidToolsInfo implements IAndroidToolsInfo {
 
 				this.printMessage("You need to have the Android SDK Build-tools installed on your system. " + message,
 					'Run "android" from your command-line to install required Android Build Tools.');
+				detectedErrors = true;
 			}
 
 			if(!toolsInfoData.supportRepositoryVersion) {
 				this.printMessage(`You need to have the latest Android Support Repository installed on your system.`,
 					'Run `$ android`  to manage the Android Support Repository.');
+				detectedErrors = true;
 			}
 
 			if(options && options.validateTargetSdk) {
@@ -81,12 +85,15 @@ export class AndroidToolsInfo implements IAndroidToolsInfo {
 
 					if(targetSdk && (targetSdk < minSupportedVersion)) {
 						this.printMessage(`The selected Android target SDK ${newTarget} is not supported. You must target ${minSupportedVersion} or later.`);
+						detectedErrors = true;
 					} else if(!targetSdk || targetSdk > this.getMaxSupportedVersion()) {
 						this.$logger.warn(`Support for the selected Android target SDK ${newTarget} is not verified. Your Android app might not work as expected.`);
 					}
 				}
 			}
-		}).future<void>()();
+
+			return detectedErrors;
+		}).future<boolean>()();
 	}
 
 	/**

lib/declarations.ts

@@ -105,9 +105,9 @@ interface IAndroidToolsInfo {
 	/**
 	 * Validates the information about required Android tools and SDK versions.
 	 * @param {any} options Defines if the warning messages should treated as error and if the targetSdk value should be validated as well.
-	 * @return {void}
+	 * @return {boolean} True if there are detected issues, false otherwise.
 	 */
-	validateInfo(options?: {showWarningsAsErrors: boolean, validateTargetSdk: boolean}): IFuture<void>;
+	validateInfo(options?: {showWarningsAsErrors: boolean, validateTargetSdk: boolean}): IFuture<boolean>;
 }
 
 /**

lib/services/doctor-service.ts

@@ -69,23 +69,26 @@ class DoctorService implements IDoctorService {
 			this.$logger.warn("WARNING: Gradle is not installed or is not configured properly.");
 			this.$logger.out("You will not be able to build your projects for Android or run them in the emulator or on a connected device." + EOL
 				+ "To be able to build for Android and run apps in the emulator or on a connected device, verify that you have installed Gradle.");
+			result = true;
 		}
 
 		if(sysInfo.gradleVer && helpers.versionCompare(sysInfo.gradleVer, DoctorService.MIN_SUPPORTED_GRADLE_VERSION) === -1) {
 			this.$logger.warn(`WARNING: Gradle version is lower than ${DoctorService.MIN_SUPPORTED_GRADLE_VERSION}.`);
 			this.$logger.out("You will not be able to build your projects for Android or run them in the emulator or on a connected device." + EOL
 				+ `To be able to build for Android and run apps in the emulator or on a connected device, verify thqt you have at least ${DoctorService.MIN_SUPPORTED_GRADLE_VERSION} version installed.`);
+			result = true;
 		}
 
 		if(!sysInfo.javacVersion) {
 			this.$logger.warn("WARNING: Javac is not installed or is not configured properly.");
 			this.$logger.out("You will not be able to build your projects for Android." + EOL
 				+ "To be able to build for Android, verify that you have installed The Java Development Kit (JDK) and configured it according to system requirements as" + EOL +
 				" described in https://github.com/NativeScript/nativescript-cli#system-requirements.");
+			result = true;
 		}
 
-		this.$androidToolsInfo.validateInfo().wait();
-		return result;
+		let androidToolsIssues = this.$androidToolsInfo.validateInfo().wait();
+		return result || androidToolsIssues;
 	}
 
 	private printPackageManagerTip() {