withStatusBarProgress API and implementation

src/vs/workbench/api/node/extHostProgress.ts

@@ -0,0 +1,46 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+import { Progress, CancellationToken } from 'vscode';
+import { MainThreadProgressShape } from './extHost.protocol';
+
+export class ExtHostProgress {
+
+	private _proxy: MainThreadProgressShape;
+	private _handles: number = 0;
+
+	constructor(proxy: MainThreadProgressShape) {
+		this._proxy = proxy;
+	}
+
+	withStatusBarProgress<R>(task: (progress: Progress<string>, token: CancellationToken) => Thenable<R>): Thenable<R> {
+		const handle = this._handles++;
+
+		this._proxy.$progressStart(handle);
+		const progress = {
+			report: (message: string) => {
+				this._proxy.$progressReport(handle, message);
+			}
+		};
+
+		let p: Thenable<R>;
+
+		try {
+			p = task(progress, null);
+		} catch (err) {
+			this._proxy.$progressEnd(handle);
+			throw err;
+		}
+
+		return p.then(result => {
+			this._proxy.$progressEnd(handle);
+			return result;
+		}, err => {
+			this._proxy.$progressEnd(handle, err);
+			throw err;
+		});
+	}
+}