gnu: Add emacs-leaf

* gnu/packages/emacs-xyz: (emacs-leaf): New variable.

Signed-off-by: Mathieu Othacehe <m.othacehe@gmail.com>

gnu/packages/emacs-xyz.scm

@@ -55,6 +55,7 @@
 ;;; Copyright © 2019 Jelle Licht <jlicht@fsfe.org>
 ;;; Copyright © 2019 Björn Höfling <bjoern.hoefling@bjoernhoefling.de>
 ;;; Copyright © 2019 Stephen Webber <montokapro@gmail.com>
+;;; Copyright © 2019 Leo Prikler <leo.prikler@student.tugraz.at>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -8959,6 +8960,36 @@ configuration in your @file{.emacs} file in a way that is both
 performance-oriented and tidy.")
     (license license:gpl2+)))
 
+(define-public emacs-leaf
+  (package
+    (name "emacs-leaf")
+    (version "3.5.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/conao3/leaf.el.git")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "1rgd59146wad92yc64las0qgx67k2ifgsw1vwhp40xvkd7kb0r6d"))))
+    (build-system emacs-build-system)
+    (home-page "https://github.com/conao3/leaf.el")
+    (arguments
+     `(#:tests? #t
+       #:test-command '("emacs" "--batch"
+                        "-l" "leaf-tests.el"
+                        "-f" "cort-test-run")))
+    (synopsis
+     "Simplify your init.el configuration, extended use-package")
+    (description
+     "This package provides macros that allows you to declaratively configure
+settings typical of an Elisp package with various keywords.  The syntax is
+similar, but not identical to use-package -- overall, leaf aims at a cleaner
+and more predictable implementation.")
+    (license license:agpl3+)))
+
 (define-public emacs-strace-mode
   (let* ((commit "6a69b4b06db6797af56f33eda5cb28af94e59f11")
          (revision "1"))