Added tns update command

Author: Tsvetan Raikov

docs/man_pages/project/configuration/update.md

@@ -0,0 +1,20 @@
+platform update
+==========
+
+Usage | Synopsis
+------|-------
+Update with the latest version |`$ tns update`
+Update with specific version | `$ tns update <version>`
+
+Updates a NativeScript project to the latest (or specified) version.
+
+### Related Commands
+
+Command | Description
+----------|----------
+[install](install.html) | Installs all platforms and dependencies described in the `package.json` file in the current directory.
+[platform add](platform-add.html) | Configures the current project to target the selected platform.
+[platform remove](platform-remove.html) | Removes the selected platform from the platforms that the project currently targets.
+[platform](platform.html) | Lists all platforms that the project currently targets.
+[prepare](prepare.html) | Copies common and relevant platform-specific content from the app directory to the subdirectory for the selected target platform in the platforms directory.
+[platform update](platform-update.html) | Updates the NativeScript runtime for the specified platform.

lib/bootstrap.ts

@@ -117,5 +117,6 @@ $injector.require("messages", "./common/messages/messages");
 $injector.require("xmlValidator", "./xml-validator");
 
 $injector.requireCommand("devices", "./commands/devices");
+$injector.requireCommand("update", "./commands/update");
 
 $injector.require("iOSLogFilter", "./services/ios-log-filter");

lib/commands/update.ts

@@ -0,0 +1,49 @@
+import * as path from "path";
+
+export class UpdateCommand implements ICommand {
+	constructor(
+		private $projectData: IProjectData,
+		private $platformService: IPlatformService,
+		private $pluginsService: IPluginsService,
+        private $logger: ILogger,
+        private $fs: IFileSystem,
+		private $options: IOptions,
+		private $errors: IErrors) { }
+
+	public execute(args: string[]): IFuture<void> {
+        return (() => {
+			let platforms = this.$platformService.getInstalledPlatforms().wait();
+
+			this.$platformService.removePlatforms(platforms).wait();
+			this.$pluginsService.remove("tns-core-modules").wait();
+			this.$pluginsService.remove("tns-core-modules-widgets").wait();
+
+            this.$fs.deleteDirectory(path.join(this.$projectData.projectDir, "lib")).wait();
+            this.$fs.deleteDirectory(path.join(this.$projectData.projectDir, "hooks")).wait();
+            this.$fs.deleteDirectory(path.join(this.$projectData.projectDir, "platforms")).wait();
+            this.$fs.deleteDirectory(path.join(this.$projectData.projectDir, "node_modules")).wait();
+
+			if (args.length === 1) {
+				for (let platform of platforms) {
+					this.$platformService.addPlatforms([ platform+"@"+args[0] ]).wait();
+				}
+				this.$pluginsService.add("tns-core-modules@" + args[0]).wait();
+			}
+			else {
+				this.$platformService.addPlatforms(platforms).wait();
+				this.$pluginsService.add("tns-core-modules").wait();
+			}
+			this.$pluginsService.ensureAllDependenciesAreInstalled().wait();
+
+        }).future<void>()();
+	}
+
+	public canExecute(args: string[]): IFuture<boolean> {
+		return (() => {
+            return args.length < 2 && this.$projectData.projectDir !== "";
+		}).future<boolean>()();
+	}
+
+	allowedParameters: ICommandParameter[] = [];
+}
+$injector.registerCommand("update", UpdateCommand);