fix(gdscript): add interpreter-mode-alist entry

Upstream only adds this for gdscript-ts-mode?

modules/lang/gdscript/README.org

@@ -14,6 +14,9 @@ engine, to Doom Emacs, powered by [[https://github.com/GDQuest/emacs-gdscript-mo
 - +lsp ::
   Enable LSP support for ~gdscript-mode~. Requires [[doom-module::tools lsp]] and a langserver
   (Godot ~3.2.1~ or newer).
+- +tree-sitter ::
+  Leverages tree-sitter for better syntax highlighting and structural text
+  editing. Requires Emacs 29.1+ and [[doom-module::tools tree-sitter]].
 
 ** Packages
 - [[doom-package:gdscript-mode]]

modules/lang/gdscript/config.el

@@ -12,7 +12,7 @@
 ;;; Packages
 
 (use-package! gdscript-mode
-  :defer t
+  :interpreter "gdscript[0-9.]*"
   :config
   (set-lookup-handlers! 'gdscript-mode
     :documentation '(gdscript-docs-browse-symbol-at-point :async t))
@@ -56,3 +56,15 @@
         (:prefix ("h" . "help")
          :desc "Browse online API"   "b" #'gdscript-docs-browse-api
          :desc "Browse API at point" "f" #'gdscript-docs-browse-symbol-at-point)))
+
+
+(use-package! gdscript-ts-mode
+  :when (modulep! +tree-sitter)
+  :defer t
+  :init
+  (set-tree-sitter! 'gdscript-mode 'gdscript-ts-mode
+    `((gdscript :url "https://github.com/PrestonKnopp/tree-sitter-gdscript.git"
+                :rev ,(if (< (treesit-library-abi-version) 15) "v5.0.1" "v6.0.0")
+                :commit "598d483e150aca2d77ad8892923980144bed4919")))
+  :config
+  (advice-add 'gdscript-ts-mode :around #'+tree-sitter-ts-mode-inhibit-side-effects-a))