feat: add Nix syntax highlighting (#3110)

* feat: add Nix syntax highlighting

* fix: update Nix dependency hash

* fix: update Nix dependency hash

---------

Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

nix/npm-deps.hash

@@ -1 +1 @@
-sha256-XSalbyEP7UNN13EVpnvQHPxvEoxSDKuYhiaRg4Tyez4=
+sha256-Ep6Z+J0urY1L66cXGe9bB6tQr8T3TY73GkLrvhf8FmA=

package-lock.json

@@ -2554,7 +2554,6 @@
       "resolved": "https://registry.npmjs.org/@codemirror/autocomplete/-/autocomplete-6.20.3.tgz",
       "integrity": "sha512-tlosUqb+3BbxCxZdu4tKeRghPFC+QM7q4X5YhKV2eCmPG+1r2F3f4AaSz5sCrFqUtX4Jh20VFTKecl16MgiV9g==",
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@codemirror/language": "^6.0.0",
         "@codemirror/state": "^6.0.0",
@@ -11155,6 +11154,21 @@
         "@lezer/lr": "^1.0.0"
       }
     },
+    "node_modules/@replit/codemirror-lang-nix": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/@replit/codemirror-lang-nix/-/codemirror-lang-nix-6.0.1.tgz",
+      "integrity": "sha512-lvzjoYn9nfJzBD5qdm3Ut6G3+Or2wEacYIDJ49h9+19WSChVnxv4ojf+rNmQ78ncuxIt/bfbMvDLMeMP0xze6g==",
+      "license": "MIT",
+      "peerDependencies": {
+        "@codemirror/autocomplete": "^6.0.0",
+        "@codemirror/language": "^6.0.0",
+        "@codemirror/state": "^6.0.0",
+        "@codemirror/view": "^6.0.0",
+        "@lezer/common": "^1.0.0",
+        "@lezer/highlight": "^1.0.0",
+        "@lezer/lr": "^1.0.0"
+      }
+    },
     "node_modules/@replit/codemirror-vim": {
       "version": "6.3.0",
       "resolved": "https://registry.npmjs.org/@replit/codemirror-vim/-/codemirror-vim-6.3.0.tgz",
@@ -38563,6 +38577,7 @@
       "name": "@getpaseo/highlight",
       "version": "0.4.0",
       "dependencies": {
+        "@codemirror/autocomplete": "6.20.3",
         "@codemirror/language": "6.12.4",
         "@codemirror/legacy-modes": "^6.5.3",
         "@lezer/common": "^1.5.0",
@@ -38581,6 +38596,7 @@
         "@lezer/xml": "^1.0.6",
         "@lezer/yaml": "^1.0.4",
         "@replit/codemirror-lang-csharp": "^6.2.0",
+        "@replit/codemirror-lang-nix": "^6.0.1",
         "lezer-elixir": "^1.1.2"
       },
       "devDependencies": {

packages/highlight/package.json

@@ -27,6 +27,7 @@
     "typecheck": "tsgo --noEmit"
   },
   "dependencies": {
+    "@codemirror/autocomplete": "6.20.3",
     "@codemirror/language": "6.12.4",
     "@codemirror/legacy-modes": "^6.5.3",
     "@lezer/common": "^1.5.0",
@@ -45,6 +46,7 @@
     "@lezer/xml": "^1.0.6",
     "@lezer/yaml": "^1.0.4",
     "@replit/codemirror-lang-csharp": "^6.2.0",
+    "@replit/codemirror-lang-nix": "^6.0.1",
     "lezer-elixir": "^1.1.2"
   },
   "devDependencies": {

packages/highlight/src/__tests__/highlighter.test.ts

@@ -75,6 +75,17 @@ describe("highlightCode", () => {
     expect(stringToken?.style).toBe("string");
   });
 
+  it("highlights Nix code", () => {
+    const code = 'let message = "hello"; in message';
+    const result = highlightCode(code, "default.nix");
+
+    const letToken = result[0].find((token) => token.text === "let");
+    expect(letToken?.style).toBe("keyword");
+
+    const stringToken = result[0].find((token) => token.text.includes("hello"));
+    expect(stringToken?.style).toBe("string");
+  });
+
   it("highlights TSX code with correct dialect", () => {
     const code = 'const el = <div className="test">hello</div>;';
     const result = highlightCode(code, "test.tsx");

packages/highlight/src/__tests__/parsers.test.ts

@@ -21,6 +21,7 @@ describe("isLanguageSupported", () => {
     expect(isLanguageSupported("test.swift")).toBe(true);
     expect(isLanguageSupported("test.dart")).toBe(true);
     expect(isLanguageSupported("test.cs")).toBe(true);
+    expect(isLanguageSupported("test.nix")).toBe(true);
     expect(isLanguageSupported("test.ex")).toBe(true);
   });
 
@@ -60,6 +61,7 @@ describe("getSupportedExtensions", () => {
     expect(extensions).toContain("swift");
     expect(extensions).toContain("dart");
     expect(extensions).toContain("cs");
+    expect(extensions).toContain("nix");
     expect(extensions).toContain("json");
   });
 });

packages/highlight/src/parsers.ts

@@ -15,6 +15,7 @@ import { parser as rustParser } from "@lezer/rust";
 import { parser as xmlParser } from "@lezer/xml";
 import { parser as yamlParser } from "@lezer/yaml";
 import { csharpLanguage } from "@replit/codemirror-lang-csharp";
+import { nixLanguage } from "@replit/codemirror-lang-nix";
 import { parser as elixirParser } from "lezer-elixir";
 import type { Parser } from "@lezer/common";
 
@@ -69,6 +70,8 @@ const languagesByExtension: Record<string, Language> = {
   dart: StreamLanguage.define(dart),
   // C#
   cs: csharpLanguage,
+  // Nix
+  nix: nixLanguage,
   // Elixir
   ex: language(elixirParser),
   exs: language(elixirParser),