Add tree-sitter grammars to emacs

Switch rnix to nil

home-manager/modules/programs/emacs.nix

@@ -30,7 +30,7 @@ in
     # For spelling
     myAspell
     # For nix
-    # rnix-lsp
+    nil
     manix
     nix-doc
     # For email
@@ -53,12 +53,20 @@ in
   programs.emacs = {
     enable = true;
     package = emacsPackage';
-    extraPackages = epkgs: [
-      epkgs.mu4e
-      epkgs.vterm
-      epkgs.pdf-tools
-      epkgs.emacsql
-      epkgs.emacsql-sqlite
-    ];
+    extraPackages =
+      epkgs: with pkgs; [
+        epkgs.mu4e
+        epkgs.vterm
+        epkgs.pdf-tools
+        epkgs.emacsql
+        epkgs.emacsql-sqlite
+        (tree-sitter.withPlugins (
+          grammars: with grammars; [
+            tree-sitter-nix
+            tree-sitter-rust
+            tree-sitter-toml
+          ]
+        ))
+      ];
   };
 }