Add example to use a single server on a multi workspace folder setup

lsp-multi-root-sample/client/src/extension.ts

@@ -0,0 +1,89 @@
+/* --------------------------------------------------------------------------------------------
+ * 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 * as path from 'path';
+
+import { workspace, Disposable, ExtensionContext, WorkspaceConfiguration } from 'vscode';
+import { 
+	LanguageClient, LanguageClientOptions, SettingMonitor, ServerOptions, TransportKind, ProposedProtocol, Middleware, CancellationToken,
+	ConfigurationMiddleware, GetConfigurationParams
+} from 'vscode-languageclient';
+
+// The example settings
+interface MultiRootExampleSettings {
+	maxNumberOfProblems: number;
+}
+
+export function activate(context: ExtensionContext) {
+
+	// The server is implemented in node
+	let serverModule = context.asAbsolutePath(path.join('server', 'server.js'));
+	// The debug options for the server
+	let debugOptions = { execArgv: ["--nolazy", "--inspect=6009"] };
+	
+	// If the extension is launched in debug mode then the debug server options are used
+	// Otherwise the run options are used
+	let serverOptions: ServerOptions = {
+		run : { module: serverModule, transport: TransportKind.ipc },
+		debug: { module: serverModule, transport: TransportKind.ipc, options: debugOptions }
+	}
+
+	// Convert VS Code specific settings to a format acceptable by the server. Since
+	// both client and server do use JSON the conversion is trivial. 
+	let configurationMiddleware: ConfigurationMiddleware = {
+		configuration: (params: GetConfigurationParams, _token: CancellationToken, _next: Function): any[] => {
+			if (!params.items) {
+				return null;
+			}
+			let result: (MultiRootExampleSettings | null)[] = [];
+			for (let item of params.items) {
+				// The server asks the client for configuration settings without a section
+				// If a section is present we return null to indicate that the configuration
+				// is not supported.
+				if (item.section) {
+					result.push(null);
+					continue;
+				}
+				let config: WorkspaceConfiguration;
+				if (item.scopeUri) {
+					config = workspace.getConfiguration('lsp-multi-root-sample', client.protocol2CodeConverter.asUri(item.scopeUri));
+				} else {
+					config = workspace.getConfiguration('lsp-multi-root-sample');
+				}
+				result.push({
+					maxNumberOfProblems: config.get('maxNumberOfProblems')
+				});
+			}
+			return result;
+
+		}
+	};
+
+	// Options to control the language client
+	let clientOptions: LanguageClientOptions = {
+		// Register the server for plain text documents
+		documentSelector: [{scheme: 'file', language: 'plaintext'}],
+		synchronize: {
+			// Notify the server about file changes to '.clientrc files contain in the workspace
+			fileEvents: workspace.createFileSystemWatcher('**/.clientrc')
+		},
+		middleware: {
+			workspace: configurationMiddleware as any // cast to any due to proposed API
+		}
+	}
+	
+	// Create the language client and start the client.
+	let client = new LanguageClient('languageServerExample', 'Language Server Example', serverOptions, clientOptions);
+	// Register new propose protocol if available.
+	client.registerFeatures(ProposedProtocol(client));
+	
+	// Start the client. This will also launch the server
+	let disposable = client.start();
+	
+	// Push the disposable to the context's subscriptions so that the 
+	// client can be deactivated on extension deactivation
+	context.subscriptions.push(disposable);
+}