gnu: Add emacs-gleam-mode.

* gnu/packages/emacs-xyz.scm (emacs-gleam-mode): New variable.

Change-Id: I8b43b618e7acf8d5064b28c83b8816d662be4ad2

gnu/packages/emacs-xyz.scm

@@ -40622,6 +40622,29 @@ sense in the @samp{To} and @samp{Cc} headers).  When in the message body, this
 executes a different function (default: @code{indent-relative}).")
       (license license:gpl2+))))
 
+(define-public emacs-gleam-mode
+  ;; No tag, version grabbed from source .el file.
+  (let ((commit "8e981614536f0e36fb14721a9fae8bf72c287a40")
+        (revision "0"))
+    (package
+      (name "emacs-gleam-mode")
+      (version (git-version "0.1.0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/gleam-lang/gleam-mode")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32 "0xspx3hpiw21pqcqpp82ngxzsdbc209cbp7yjl5i1j5rwj6d09r7"))))
+      (build-system emacs-build-system)
+      (home-page "https://github.com/gleam-lang/gleam-mode")
+      (synopsis "Gleam support for Emacs")
+      (description
+       "This package provides an Emacs major mode for the Gleam language.")
+      (license (list license:asl2.0 license:gpl3+)))))
+
 (define-public emacs-glsl-mode
   ;; No tag, version grabbed from source .el file.
   (let ((commit "b07112016436d9634cd4ef747f9af6b01366d136")