Install swift-ts-mode and swift treesitter grammar

flakes/emacs/home.nix

@@ -1,7 +1,16 @@
 { pkgs, lib, ... }:
+let
+  swiftTreeSitterGrammar = pkgs.tree-sitter-grammars.tree-sitter-swift;
+  swiftTreeSitterLibraryName =
+    if pkgs.stdenv.hostPlatform.isDarwin then
+      "libtree-sitter-swift.dylib"
+    else
+      "libtree-sitter-swift.so";
+in
 {
   home.file.".emacs.d/early-init.el".source = ./config/early-init.el;
-  home.file.".emacs.d/tree-sitter/libtree-sitter-swift.dylib".source = ./config/tree-sitter/libtree-sitter-swift.dylib;
+  home.file.".emacs.d/tree-sitter/${swiftTreeSitterLibraryName}".source =
+    "${swiftTreeSitterGrammar}/parser";
   home.file.".emacs.d/snippets".source = ./config/snippets;
 
   programs.emacs = {
@@ -64,6 +73,7 @@
         restclient
         smartparens
         swift-mode
+        swift-ts-mode
         super-save
         terraform-mode
         treesit-auto