Add nix language syntax highlight (#1081)

common/languages.ts

@@ -45,6 +45,7 @@ import {
   highlightingQueryParser,
 } from "./markdown_parser/parser.ts";
 import { cssLanguage } from "@codemirror/lang-css";
+import { nixLanguage } from "@replit/codemirror-lang-nix";
 
 const yamlStreamLanguage = StreamLanguage.define(yamlLanguage);
 
@@ -114,6 +115,7 @@ export const builtinLanguages: Record<string, Language> = {
   "dockerfile": StreamLanguage.define(dockerfileLanguage),
   "cmake": StreamLanguage.define(cmakeLanguage),
   "erlang": StreamLanguage.define(erlangLanguage),
+  "nix": nixLanguage,
   "query": LRLanguage.define({
     name: "query",
     parser: highlightingQueryParser,

deno.json

@@ -128,6 +128,7 @@
     "@lezer/lr": "https://esm.sh/@lezer/[email protected]?external=@lezer/common&target=es2022",
     "@lezer/markdown": "https://esm.sh/@lezer/[email protected]?external=@lezer/common,@codemirror/language,@lezer/highlight,@lezer/lr&target=es2022",
     "@luca/esbuild-deno-loader": "jsr:@luca/esbuild-deno-loader@^0.10.3",
+    "@replit/codemirror-lang-nix": "https://esm.sh/@replit/[email protected]?external=@codemirror/language,@codemirror/autocomplete,@codemirror/state,@lezer/highlight,@lezer/lr&target=es2022",
     "@replit/codemirror-vim": "https://esm.sh/@replit/[email protected]?external=@codemirror/state,@codemirror/language,@codemirror/view,@codemirror/search,@codemirror/commands",
     "@std/assert": "jsr:@std/assert@^1.0.1",
     "@std/cli": "jsr:@std/cli@^1.0.1",