Optimization: chunk up all coding languages

Even though the service worker will proactively cache them in the
browser, the browser will not have to load them, parse them, interpret
them unless these languages are actually used. Less JS to load, less
waiting.

Author: zefhemel

client/codemirror/editor_state.ts

@@ -44,7 +44,11 @@ import { createSmartQuoteKeyBindings } from "./smart_quotes.ts";
 import { documentExtension, pasteLinkExtension } from "./editor_paste.ts";
 import type { TextChange } from "./change.ts";
 import { postScriptPrefacePlugin } from "./top_bottom_panels.ts";
-import { languageFor } from "../languages.ts";
+import {
+  lazyLanguages,
+  languageFor,
+  loadLanguageFor,
+} from "../languages.ts";
 import { plugLinter } from "./lint.ts";
 import { buildExtendedMarkdownLanguage } from "../markdown_parser/parser.ts";
 import { safeRun } from "@silverbulletmd/silverbullet/lib/async";
@@ -462,6 +466,13 @@ export function buildMarkdownLanguageExtension(client: Client): Extension[] {
             support: new LanguageSupport(lang),
           });
         }
+        if (info in lazyLanguages) {
+          return LanguageDescription.of({
+            name: info,
+            load: async () =>
+              new LanguageSupport((await loadLanguageFor(info))!),
+          });
+        }
         return null;
       },
       addKeymap: true,