gnu: Add emacs-exwm-x. WIP

* gnu/packages/emacs.scm (emacs-exwm-x): New variable.

gnu/packages/emacs.scm

@@ -4525,6 +4525,34 @@ It should enable you to implement low-level X11 applications.")
 built on top of XELB.")
     (license license:gpl3+)))
 
+(define-public emacs-exwm-x
+  (package
+    (name "emacs-exwm-x")
+    (version "0.8.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "https://github.com/tumashu/exwm-x/archive/v"
+             version ".tar.gz"))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0k3kigkmb73mqqxhsj1jy6qbhvgya8qh2i7xa4qwrzqi1x877jy7"))))
+    (build-system emacs-build-system)
+    (propagated-inputs
+     `(("emacs-exwm" ,emacs-exwm)
+       ;; Optional, for dmenu
+       ;;("emacs-switch-window" ,emacs-switch-window)
+       ;;("emacs-swiper" ,emacs-swiper)
+       ))
+    (home-page "https://github.com/tumashu/exwm-x")
+    (synopsis
+     "Extensions for EXWM (Emacs X window manager)")
+    (description
+     "Exwm-X is a collection of extensions for EXWM (Emacs X window manager).")
+    (license license:gpl3+)))
+
 (define-public emacs-gnuplot
   (package
     (name "emacs-gnuplot")