gnu: Add emacs-pretty-hydra.

* gnu/packages/emacs-xyz.scm (emacs-pretty-hydra): New variable.

Signed-off-by: Christopher Baines <mail@cbaines.net>

gnu/packages/emacs-xyz.scm

@@ -7126,6 +7126,35 @@ the Hydra very seamless; it's like a minor mode that disables itself
 automatically.")
     (license license:gpl3+)))
 
+(define-public emacs-pretty-hydra
+  (package
+    (name "emacs-pretty-hydra")
+    (version "0.2.2")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/jerrypnz/major-mode-hydra.el")
+             (commit version)))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "08a15knkdq35pzjq82imff016fbfdib5q4glg2xmdy2b5fnk7jqa"))))
+    (build-system emacs-build-system)
+    (propagated-inputs
+     `(("emacs-dash" ,emacs-dash)
+       ("emacs-hydra" ,emacs-hydra)
+       ("emacs-s" ,emacs-s)))
+    (arguments
+     `(#:exclude (cons "^major-mode-hydra\\.el" %default-exclude)))
+    (home-page "https://github.com/jerrypnz/major-mode-hydra.el")
+    (synopsis "Major mode keybindings managed by Hydra")
+    (description
+     "This package offers an hydra-based method of managing major
+mode-specific key bindings.  It is intended for use as a library only; see
+package @code{emacs-major-mode-hydra} for a user-friendly interface.")
+    (license license:gpl3+)))
+
 (define-public emacs-interleave
   (package
     (name "emacs-interleave")