rosenthal: Add emacs-treesit-auto.

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

modules/rosenthal/packages/emacs-xyz.scm

@@ -32,6 +32,29 @@
 and it's subcommands.")
       (license license:gpl3+))))
 
+(define-public emacs-treesit-auto
+  (package
+    (name "emacs-treesit-auto")
+    ;; NOTE: Not tagged, also change commit when updating.
+    (version "1.0.7")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/renzmann/treesit-auto")
+             (commit "016bd286a1ba4628f833a626f8b9d497882ecdf3")))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "03bvam7cpxqp4idhd235n76qdqhsbgw7m2lphy8qqwslbmcq23m4"))))
+    (build-system emacs-build-system)
+    (home-page "https://github.com/renzmann/treesit-auto")
+    (synopsis "Automatically use tree-sitter major modes")
+    (description
+     "@code{treesit-auto} is an Emacs package for automatically using tree-sitter
+major modes and falling back to the original major mode when its tree-sitter
+counterpart is unavailable.")
+    (license license:gpl3+)))
+
 ;; https://issues.guix.gnu.org/59552
 (define-public emacs-wakatime-mode
   ;; No release since May 5, 2015.