[bug#44796] [PATCH] gnu: Add emacs-undo-fu-session

[Niklas Eklund <niklas.eklund@posteo.net>]

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From 476d51e409163fdf86f0ec3fe86ca8f870cb8f08 Mon Sep 17 00:00:00 2001
From: Niklas Eklund <niklas.eklund@posteo.net>
Date: Sun, 22 Nov 2020 14:15:57 +0100
Subject: [PATCH] gnu: Add emacs-undo-fu-session.

* gnu/packages/emacs-xyz.scm (emacs-undo-fu-session): New variable.
---
 gnu/packages/emacs-xyz.scm | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/gnu/packages/emacs-xyz.scm b/gnu/packages/emacs-xyz.scm
index 885487bf17..2316d86081 100644
--- a/gnu/packages/emacs-xyz.scm
+++ b/gnu/packages/emacs-xyz.scm
@@ -3074,6 +3074,31 @@ adding convenient undo/redo without losing access to the full undo history,
 allowing you to visit all previous states of the document if you need.")
       (license license:gpl3+))))
 
+(define-public emacs-undo-fu-session
+  ;; There are no tagged releases upstream on gitlab, instead we are using
+  ;; the most recent commit.
+  (let ((commit "56cdd3538a058c6916bdf2d9010c2179f2505829")
+        (revision "0"))
+    (package
+      (name "emacs-undo-fu-session")
+      (version (git-version "0.2" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://gitlab.com/ideasman42/emacs-undo-fu-session")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32 "04wq1alrzzlidcb4mjb5j7pg68pks1vgv7kvvmi6dzb3l602mb2a"))))
+      (build-system emacs-build-system)
+      (home-page "https://gitlab.com/ideasman42/emacs-undo-fu-session")
+      (synopsis "Save & recover undo steps between Emacs sessions")
+      (description
+       "This package writes undo/redo information upon file save which is restored
+where possible when the file is loaded again.")
+      (license license:gpl3+))))
+
 (define-public emacs-s
   (package
     (name "emacs-s")
-- 
2.28.0