gnu: Add emacs-treesit-auto.

* gnu/packages/emacs-xyz.scm (emacs-treesit-auto): New variable.

Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>

gnu/packages/emacs-xyz.scm

@@ -28053,6 +28053,30 @@ subs, classes, etc.), and REPL interaction.")
        "This package provides an Emacs library to manage tree widgets.")
       (license license:gpl3+))))
 
+(define-public emacs-treesit-auto
+  (let ((commit "016bd286a1ba4628f833a626f8b9d497882ecdf3")) ; version bump
+    (package
+      (name "emacs-treesit-auto")
+      (version "1.0.7")
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/renzmann/treesit-auto")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32 "03bvam7cpxqp4idhd235n76qdqhsbgw7m2lphy8qqwslbmcq23m4"))))
+      (build-system emacs-build-system)
+      (arguments '(#:tests? #f)) ; no tests
+      (home-page "https://github.com/renzmann/treesit-auto")
+      (synopsis
+       "Automatically install and use tree-sitter major modes in Emacs 29+")
+      (description
+       "Install a tree-sitter major mode automatically.  If the tree-sitter
+version can't be used, fall back to the original major mode.")
+      (license license:gpl3))))
+
 (define-public emacs-md4rd
   (package
     (name "emacs-md4rd")