gnu: Add emacs-org-caldav.

* gnu/packages/emacs.scm (emacs-org-caldav): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/emacs.scm

@@ -10551,3 +10551,27 @@ well as take screenshots and lock your screen.  The package depends on the
 availability of shell commands to do the hard work for us.  These commands can
 be changed by customizing the appropriate variables.")
     (license license:gpl3+)))
+
+(define-public emacs-org-caldav
+  (package
+    (name "emacs-org-caldav")
+    (version "20180403")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "https://github.com/dengste/org-caldav/raw/"
+             "8d3492c27a09f437d2d94f2736c56d7652e87aa0"
+             "/org-caldav.el"))
+       (sha256
+        (base32
+         "1fh4gh68ddj0is99z2ccyh97v6psnyda61n2dsadzqhcxn51amlc"))))
+    (build-system emacs-build-system)
+    (propagated-inputs `(("emacs-org" ,emacs-org)))
+    (home-page "https://github.com/dengste/org-caldav")
+    (synopsis
+     "Sync Org files with external calendars via the CalDAV protocol")
+    (description
+     "Synchronize between events in Org-mode files and a CalDAV calendar.
+This code is still alpha.")
+    (license license:gpl3+)))