first cut of option-less open, #13807

src/vs/workbench/api/node/extHost.api.impl.ts

@@ -52,6 +52,7 @@ import * as languageConfiguration from 'vs/editor/common/modes/languageConfigura
 import { TextEditorCursorStyle } from 'vs/editor/common/config/editorOptions';
 import { ExtHostThreadService } from "vs/workbench/services/thread/node/extHostThreadService";
 import { ProxyIdentifier } from "vs/workbench/services/thread/common/threadService";
+import { ExtHostDialogs } from "vs/workbench/api/node/extHostDialogs";
 
 export interface IExtensionApiFactory {
 	(extension: IExtensionDescription): typeof vscode;
@@ -105,6 +106,7 @@ export function createApiFactory(
 
 	// Other instances
 	const extHostMessageService = new ExtHostMessageService(threadService);
+	const extHostDialogs = new ExtHostDialogs(threadService);
 	const extHostStatusBar = new ExtHostStatusBar(threadService);
 	const extHostProgress = new ExtHostProgress(threadService.get(MainContext.MainThreadProgress));
 	const extHostOutputService = new ExtHostOutputService(threadService);
@@ -368,6 +370,9 @@ export function createApiFactory(
 			sampleFunction: proposedApiFunction(extension, () => {
 				return extHostMessageService.showMessage(extension.id, Severity.Info, 'Hello Proposed Api!', {}, []);
 			}),
+			showOpenDialog: proposedApiFunction(extension, () => {
+				return extHostDialogs.showOpenDialog();
+			})
 		};
 
 		// namespace: workspace

src/vs/workbench/api/node/extHost.protocol.ts

@@ -113,6 +113,10 @@ export interface MainThreadDiagnosticsShape extends IDisposable {
 	$clear(owner: string): TPromise<any>;
 }
 
+export interface MainThreadDiaglogsShape extends IDisposable {
+	$showOpenDialog(): TPromise<string[]>;
+}
+
 export interface MainThreadDocumentContentProvidersShape extends IDisposable {
 	$registerTextContentProvider(handle: number, scheme: string): void;
 	$unregisterTextContentProvider(handle: number): void;
@@ -532,6 +536,7 @@ export const MainContext = {
 	MainThreadConfiguration: createMainId<MainThreadConfigurationShape>('MainThreadConfiguration'),
 	MainThreadDebugService: createMainId<MainThreadDebugServiceShape>('MainThreadDebugService'),
 	MainThreadDiagnostics: createMainId<MainThreadDiagnosticsShape>('MainThreadDiagnostics'),
+	MainThreadDialogs: createMainId<MainThreadDiaglogsShape>('MainThreadDiaglogs'),
 	MainThreadDocuments: createMainId<MainThreadDocumentsShape>('MainThreadDocuments'),
 	MainThreadDocumentContentProviders: createMainId<MainThreadDocumentContentProvidersShape>('MainThreadDocumentContentProviders'),
 	MainThreadEditors: createMainId<MainThreadEditorsShape>('MainThreadEditors'),

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

@@ -0,0 +1,26 @@
+/*---------------------------------------------------------------------------------------------
+ *  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 { MainContext, MainThreadDiaglogsShape, IMainContext } from 'vs/workbench/api/node/extHost.protocol';
+import URI from "vs/base/common/uri";
+
+export class ExtHostDialogs {
+
+	private readonly _proxy: MainThreadDiaglogsShape;
+
+	constructor(mainContext: IMainContext) {
+		this._proxy = mainContext.get(MainContext.MainThreadDialogs);
+	}
+
+	showOpenDialog(): Thenable<URI[]> {
+		return this._proxy.$showOpenDialog().then(filepaths => {
+			if (!filepaths) {
+				return undefined;
+			}
+			return filepaths.map(URI.file);
+		});
+	}
+}