Install treesitter grammars with nix

flakes/emacs/config/init.el

@@ -709,7 +709,7 @@
 
 (use-package treesit-auto
   :custom
-  (treesit-auto-install 'prompt)
+  (treesit-auto-install nil)
   :config
   (setq treesit-auto-langs
         '(swift

flakes/emacs/home.nix

@@ -1,17 +1,29 @@
 { 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";
+  treeSitterLibraryExtension =
+    if pkgs.stdenv.hostPlatform.isDarwin then "dylib" else "so";
+
+  treeSitterGrammars = {
+    swift = pkgs.tree-sitter-grammars.tree-sitter-swift;
+    python = pkgs.tree-sitter-grammars.tree-sitter-python;
+    typescript = pkgs.tree-sitter-grammars.tree-sitter-typescript;
+    tsx = pkgs.tree-sitter-grammars.tree-sitter-tsx;
+    javascript = pkgs.tree-sitter-grammars.tree-sitter-javascript;
+    json = pkgs.tree-sitter-grammars.tree-sitter-json;
+  };
 in
 {
-  home.file.".emacs.d/early-init.el".source = ./config/early-init.el;
-  home.file.".emacs.d/tree-sitter/${swiftTreeSitterLibraryName}".source =
-    "${swiftTreeSitterGrammar}/parser";
-  home.file.".emacs.d/snippets".source = ./config/snippets;
+  home.file =
+    (lib.mapAttrs'
+      (language: grammar:
+        lib.nameValuePair
+          ".emacs.d/tree-sitter/libtree-sitter-${language}.${treeSitterLibraryExtension}"
+          { source = "${grammar}/parser"; })
+      treeSitterGrammars)
+    // {
+      ".emacs.d/early-init.el".source = ./config/early-init.el;
+      ".emacs.d/snippets".source = ./config/snippets;
+    };
 
   programs.emacs = {
     enable = true;