gnu: Add emacs-packed.

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

gnu/packages/emacs-xyz.scm

@@ -55,7 +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>
+;;; Copyright © 2019, 2021 Leo Prikler <leo.prikler@student.tugraz.at>
 ;;; Copyright © 2019 David Wilson <david@daviwil.com>
 ;;; Copyright © 2020 Paul Garlick <pgarlick@tourbillion-technology.com>
 ;;; Copyright © 2020 Robert Smith <robertsmith@posteo.net>
@@ -20485,6 +20485,36 @@ (define-public emacs-package-lint
 file.")
     (license license:gpl3+)))
 
+(define-public emacs-packed
+  (package
+    (name "emacs-packed")
+    (version "3.0.3")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/emacscollective/packed")
+             (commit version)))
+       (sha256
+        (base32
+         "06blk8parnpq3qi6y5628q3v59c8dyi41glb289a0l16248qwphk"))))
+    (build-system emacs-build-system)
+    (home-page "https://github.com/emacscollective/packed")
+    (synopsis "Package manager agnostic Emacs Lisp package utilities")
+    (description
+     "Packed provides some package manager agnostic utilities to work
+with Emacs Lisp packages.  As far as Packed is concerned packages
+are collections of Emacs Lisp libraries that are stored in a
+dedicated directory such as a Git repository.  And libraries are
+Emacs Lisp files that provide the correct feature (matching the
+filename).
+
+Where a package manager might depend on metadata, Packed instead
+uses some heuristics to get the same information---that is slower
+and might also fail at times but makes it unnecessary to maintain
+package recipes.")
+    (license license:gpl3+)))
+
 (define-public emacs-picpocket
   (let ((version "41")
         (commit "fa3a49f011b5ae139728548fec7375743f61c7c7"))