Implement doctor coomand in AppBuilder CLI

See NativeScript/nativescript-cli#480 and http://teampulse.telerik.com/view#item/294290

Author: teobugslayer

docs/man_pages/general/doctor.md

@@ -0,0 +1,19 @@
+doctor
+==========
+
+Usage | Synopsis
+------|-------
+General | `$ tns doctor`
+
+Checks your system and reports potential problems which may prevent developing with AppBuilder CLI.
+
+
+<% if(isHtml) { %> 
+### Related Commands
+
+Command | Description
+----------|----------
+[feature-usage-tracking](feature-usage-tracking.html) | Configures anonymous usage statistics tracking for the NativeScript CLI.
+[autocomplete](autocomplete.html) | Prints your current command-line completion settings. If disabled, prompts you to enable it.
+[help](help.html) | Lists the available commands or shows information about the selected command.
+<% } %>

lib/bootstrap.ts

@@ -185,3 +185,5 @@ $injector.requireCommand("screenbuilder", "./commands/screenbuilder");
 $injector.require("webViewService", "./services/web-view-service");
 $injector.requireCommand("webview|*list", "./commands/web-view/list-web-views");
 $injector.requireCommand("webview|set", "./commands/web-view/set-web-view");
+
+$injector.require("doctorService", "./services/doctor-service");

lib/common

@@ -0,0 +1,72 @@
+///<reference path="../.d.ts"/>
+"use strict";
+import os = require("os");
+import helpers = require("../helpers");
+
+class DoctorService implements IDoctorService {
+
+	constructor(
+		private $hostInfo: IHostInfo,
+		private $sysInfo: ISysInfo,
+		private $logger: ILogger) {	}
+
+	public printWarnings(): boolean {
+		let result = false;
+		let sysInfo = this.$sysInfo.getSysInfo();
+
+		if (!sysInfo.adbVer) {
+			this.$logger.warn("WARNING: adb from the Android SDK is not installed or is not configured properly. ");
+			this.$logger.out("For Android-related operations, the AppBuilder CLI will use a built-in version of adb." + os.EOL
+				+ "To avoid possible issues with the native Android emulator, Genymotion or connected" + os.EOL
+				+ "Android devices, verify that you have installed the latest Android SDK and" + os.EOL
+				+ "its dependencies as described in http://developer.android.com/sdk/index.html#Requirements" + os.EOL);
+
+			this.printPackageManagerTip();
+			result = true;
+		}
+		if (!sysInfo.androidInstalled) {
+			this.$logger.warn("WARNING: The Android SDK is not installed or is not configured properly.");
+			this.$logger.out("You will not be able to run your apps in the native emulator. To be able to run apps" + os.EOL
+				+ "in the native Android emulator, verify that you have installed the latest Android SDK " + os.EOL
+				+ "and its dependencies as described in http://developer.android.com/sdk/index.html#Requirements" + os.EOL
+			);
+
+			this.printPackageManagerTip();
+			result = true;
+		}
+		if (!sysInfo.itunesInstalled) {
+			this.$logger.warn("WARNING: iTunes is not installed.");
+			this.$logger.out("You will not be able to work with iOS devices via cable connection." + os.EOL
+				+ "To be able to work with connected iOS devices," + os.EOL
+				+ "download and install iTunes from http://www.apple.com" + os.EOL);
+			result = true;
+		}
+		if(!sysInfo.javaVer) {
+			this.$logger.warn("WARNING: The Java Development Kit (JDK) is not installed or is not configured properly.");
+			this.$logger.out("You will not be able to work with the Android SDK and you might not be able" + os.EOL
+				+ "to perform some Android-related operations. To ensure that you can develop and" + os.EOL
+				+ "test your apps for Android, verify that you have installed the JDK as" + os.EOL
+				+ "described in http://docs.oracle.com/javase/8/docs/technotes/guides/install/install_overview.html (for JDK 8)" + os.EOL
+				+ "or http://docs.oracle.com/javase/7/docs/webnotes/install/ (for JDK 7)." + os.EOL);
+			result = true;
+		}
+		if(this.$hostInfo.isDarwin && (!sysInfo.monoVer || helpers.versionCompare(sysInfo.monoVer, "3.12.0") < 0)) {
+			this.$logger.warn("WARNING: Mono 3.12 or later is not installed or not configured properly.");
+			this.$logger.out("You will not be able to work with Android devices in the device simulator or debug on connected Android devices." + os.EOL
+				+ "To be able to work with Android in the device simulator and debug on connected Android devices," + os.EOL
+				+ "download and install Mono 3.12 or later from http://www.mono-project.com/download/" + os.EOL);
+			result = true;
+		}
+
+		return result;
+	}
+
+	private printPackageManagerTip() {
+		if (this.$hostInfo.isWindows) {
+			this.$logger.out("TIP: To avoid setting up the necessary environment variables, you can use the chocolatey package manager to install the Android SDK and its dependencies." + os.EOL);
+		} else if (this.$hostInfo.isDarwin) {
+			this.$logger.out("TIP: To avoid setting up the necessary environment variables, you can use the Homebrew package manager to install the Android SDK and its dependencies." + os.EOL);
+		}
+	}
+}
+$injector.register("doctorService", DoctorService);