Share Progress indicator between the CLIs

See NativeScript/nativescript-cli#1294

Author: teobugslayer

bootstrap.ts

@@ -33,6 +33,7 @@ $injector.require("prompter", "./prompter");
 $injector.require("projectHelper", "./project-helper");
 $injector.require("pluginVariablesHelper", "./plugin-variables-helper");
 $injector.require("propertiesParser", "./properties-parser");
+$injector.require("progressIndicator", "./progress-indicator");
 
 $injector.requireCommand(["help", "/?"], "./commands/help");
 $injector.requireCommand("usage-reporting", "./commands/analytics");

declarations.d.ts

@@ -702,3 +702,17 @@ interface IWinReg {
 	 */
 	registryKeys: IHiveIds;
 }
+
+/**
+ * Used to show indication that a process is running
+ */
+interface IProgressIndicator {
+	/**
+	 * Prints indication that a process is running
+	 * @param  {IFuture<any>}	future		process
+	 * @param  {number}			timeout		time interval for printing indication
+	 * @param  {boolean}		options		whether to surpress the trailing new line printed after the process ends
+	 * @return {IFuture<void>}
+	 */
+	showProgressIndicator(future: IFuture<any>, timeout: number, options?: { surpressTrailingNewLine?: boolean }): IFuture<void>;
+}

progress-indicator.ts

@@ -0,0 +1,28 @@
+///<reference path=".d.ts"/>
+"use strict";
+
+export class ProgressIndicator implements IProgressIndicator {
+	constructor(private $logger: ILogger) { }
+
+	public showProgressIndicator(future: IFuture<any>, timeout: number, options?: { surpressTrailingNewLine?: boolean }): IFuture<void> {
+		return (() => {
+			let surpressTrailingNewLine = options && options.surpressTrailingNewLine;
+			try {
+				while(!future.isResolved()) {
+					this.$logger.printMsgWithTimeout(".", timeout).wait();
+				}
+
+				// Make sure future is not left behind and prevent "There are outstanding futures." error.
+				future.wait();
+			} catch (err) {
+				this.$logger.out();
+				throw err;
+			}
+
+			if (!surpressTrailingNewLine) {
+				this.$logger.out();
+			}
+		}).future<void>()();
+	}
+}
+$injector.register("progressIndicator", ProgressIndicator);