gnu: Add emacs-racket-mode.

* gnu/packages/emacs.scm (emacs-racket-mode): New public variable.

gnu/packages/emacs.scm

@@ -9754,3 +9754,35 @@ (define-public emacs-faceup
 language-specific @code{font-lock} rules.  This package makes it possible to
 perform regression test for packages that provide font-lock rules.")
       (license license:gpl3+))))
+
+(define-public emacs-racket-mode
+  (let ((commit "33877b1bb24faea68842e0396bd5718b84e47451")
+        (revision "1"))
+    (package
+      (name "emacs-racket-mode")
+      (version (string-append "0.0.1" "-" revision "."
+                              (string-take commit 7)))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/greghendershott/racket-mode")
+               (commit commit)))
+         (file-name (string-append name "-" version "-checkout"))
+         (sha256
+          (base32
+           "0681mzwx08zwbh8qg3s26jw1jn4fw2ljp1akxqkhy08sxhafqvb1"))))
+      (build-system emacs-build-system)
+      (propagated-inputs
+       `(("emacs-faceup" ,emacs-faceup)
+         ("emacs-s" ,emacs-s)))
+      (home-page "https://github.com/greghendershott/racket-mode")
+      (synopsis "Major mode for Racket language")
+      (description "@code{racket-mode} provides:
+
+@itemize
+@item Focus on Racket (not various Schemes).
+@item Follow DrRacket concepts where applicable.
+@item Thorough font-lock and indent.
+@end itemize\n")
+      (license license:gpl3+))))