Improve custom data reading

extensions/css-language-features/client/src/cssMain.ts

@@ -11,6 +11,7 @@ const localize = nls.loadMessageBundle();
 
 import { languages, window, commands, ExtensionContext, Range, Position, CompletionItem, CompletionItemKind, TextEdit, SnippetString, workspace } from 'vscode';
 import { LanguageClient, LanguageClientOptions, ServerOptions, TransportKind, Disposable } from 'vscode-languageclient';
+import { getCustomDataPathsInAllWorkspaces } from './customData';
 
 // this method is called when vs code is activated
 export function activate(context: ExtensionContext) {
@@ -30,21 +31,7 @@ export function activate(context: ExtensionContext) {
 
 	let documentSelector = ['css', 'scss', 'less'];
 
-	let dataPaths: string[] = workspace.getConfiguration('css').get('experimental.customData', []);
-	if (dataPaths && dataPaths.length > 0) {
-		if (!workspace.workspaceFolders) {
-			dataPaths = [];
-		} else {
-			try {
-				const workspaceRoot = workspace.workspaceFolders[0].uri.fsPath;
-				dataPaths = dataPaths.map(d => {
-					return path.resolve(workspaceRoot, d);
-				});
-			} catch (err) {
-				dataPaths = [];
-			}
-		}
-	}
+	let dataPaths = getCustomDataPathsInAllWorkspaces(workspace.workspaceFolders);
 
 	// Options to control the language client
 	let clientOptions: LanguageClientOptions = {

extensions/css-language-features/client/src/customData.ts

@@ -0,0 +1,39 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as path from 'path';
+import { workspace, WorkspaceFolder } from 'vscode';
+
+interface ExperimentalConfig {
+	experimental?: {
+		customData?: string[]
+	};
+}
+
+export function getCustomDataPathsInAllWorkspaces(workspaceFolders: WorkspaceFolder[] | undefined): string[] {
+	const dataPaths: string[] = [];
+
+	if (!workspaceFolders) {
+		return dataPaths;
+	}
+
+	workspaceFolders.forEach(wf => {
+		const allCssConfig = workspace.getConfiguration(undefined, wf.uri);
+		const wfCSSConfig = allCssConfig.inspect<ExperimentalConfig>('css');
+		if (
+			wfCSSConfig &&
+			wfCSSConfig.workspaceFolderValue &&
+			wfCSSConfig.workspaceFolderValue.experimental &&
+			wfCSSConfig.workspaceFolderValue.experimental.customData
+		) {
+
+			wfCSSConfig.workspaceFolderValue.experimental.customData.forEach(p => [
+				dataPaths.push(path.resolve(wf.uri.fsPath, p))
+			]);
+		}
+	});
+
+	return dataPaths;
+}

extensions/css-language-features/package.json

@@ -34,7 +34,9 @@
         "properties": {
           "css.experimental.customData": {
             "type": "array",
-            "description": "A list of JSON file paths that define custom CSS data that loads custom properties, at directives, pseudo classes / elements."
+            "description": "A list of JSON file paths that define custom CSS data that loads custom properties, at directives, pseudo classes / elements.",
+            "default": [],
+            "scope": "resource"
           },
           "css.validate": {
             "type": "boolean",