enable markdown language server for prompt files (microsoft#252656)

Author: aeschli

extensions/markdown-language-features/package.json

@@ -17,6 +17,9 @@
   ],
   "activationEvents": [
     "onLanguage:markdown",
+    "onLanguage:prompt",
+    "onLanguage:instructions",
+    "onLanguage:chatmode",
     "onCommand:markdown.api.render",
     "onCommand:markdown.api.reloadPlugins",
     "onWebviewPanel:markdown.preview"

extensions/markdown-language-features/src/client/client.ts

@@ -7,7 +7,7 @@ import * as vscode from 'vscode';
 import { BaseLanguageClient, LanguageClientOptions, NotebookDocumentSyncRegistrationType, Range, TextEdit } from 'vscode-languageclient';
 import { IMdParser } from '../markdownEngine';
 import { IDisposable } from '../util/dispose';
-import { looksLikeMarkdownPath, markdownFileExtensions } from '../util/file';
+import { looksLikeMarkdownPath, markdownFileExtensions, markdownLanguageIds } from '../util/file';
 import { FileWatcherManager } from './fileWatchingManager';
 import { InMemoryDocument } from './inMemoryDocument';
 import * as proto from './protocol';
@@ -60,7 +60,7 @@ export async function startClient(factory: LanguageClientConstructor, parser: IM
 	const mdFileGlob = `**/*.{${markdownFileExtensions.join(',')}}`;
 
 	const clientOptions: LanguageClientOptions = {
-		documentSelector: [{ language: 'markdown' }],
+		documentSelector: markdownLanguageIds,
 		synchronize: {
 			configurationSection: ['markdown'],
 			fileEvents: vscode.workspace.createFileSystemWatcher(mdFileGlob),

extensions/markdown-language-features/src/util/file.ts

@@ -19,8 +19,10 @@ export const markdownFileExtensions = Object.freeze<string[]>([
 	'workbook',
 ]);
 
+export const markdownLanguageIds = ['markdown', 'prompt', 'instructions', 'chatmode'];
+
 export function isMarkdownFile(document: vscode.TextDocument) {
-	return document.languageId === 'markdown';
+	return markdownLanguageIds.indexOf(document.languageId) !== -1;
 }
 
 export function looksLikeMarkdownPath(resolvedHrefPath: vscode.Uri): boolean {