From f135fdad38ecacf7735aff89f66d78b865890d2b Mon Sep 17 00:00:00 2001
From: Brian Leung <leungbk@mailfence.com>
Date: Mon, 18 May 2020 11:45:16 -0700
Subject: [PATCH] emacsPackages.git-undo: init at 2019-10-13

---
 .../emacs/elisp-packages/git-undo/default.nix | 36 +++++++++++++++++++
 .../emacs/elisp-packages/manual-packages.nix  |  2 ++
 2 files changed, 38 insertions(+)
 create mode 100644 pkgs/applications/editors/emacs/elisp-packages/git-undo/default.nix

diff --git a/pkgs/applications/editors/emacs/elisp-packages/git-undo/default.nix b/pkgs/applications/editors/emacs/elisp-packages/git-undo/default.nix
new file mode 100644
index 000000000000..1b4da6340dc2
--- /dev/null
+++ b/pkgs/applications/editors/emacs/elisp-packages/git-undo/default.nix
@@ -0,0 +1,36 @@
+{ stdenv, fetchFromGitHub, emacs, lib }:
+
+stdenv.mkDerivation {
+  pname = "git-undo";
+  version = "2019-10-13";
+
+  src = fetchFromGitHub {
+    owner = "jwiegley";
+    repo = "git-undo-el";
+    rev = "cf31e38e7889e6ade7d2d2b9f8719fd44f52feb5";
+    sha256 = "sha256-cVkK9EF6qQyVV3uVqnBEjF8e9nEx/8ixnM8PvxqCyYE=";
+  };
+
+  buildInputs = [ emacs ];
+
+  buildPhase = ''
+    runHook preBuild
+    emacs -L . --batch -f batch-byte-compile *.el
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+    install -d $out/share/emacs/site-lisp
+    install *.el *.elc $out/share/emacs/site-lisp
+    runHook postInstall
+  '';
+
+  meta = {
+    description = "Revert region to most recent Git-historical version";
+    homepage = "https://github.com/jwiegley/git-undo-el";
+    license = lib.licenses.gpl2Plus;
+    maintainers = with lib.maintainers; [ leungbk ];
+    platforms = emacs.meta.platforms;
+  };
+}
diff --git a/pkgs/applications/editors/emacs/elisp-packages/manual-packages.nix b/pkgs/applications/editors/emacs/elisp-packages/manual-packages.nix
index 061d58fbc5bc..9e0631c5d112 100644
--- a/pkgs/applications/editors/emacs/elisp-packages/manual-packages.nix
+++ b/pkgs/applications/editors/emacs/elisp-packages/manual-packages.nix
@@ -88,6 +88,8 @@
     };
   };
 
+  git-undo = callPackage ./git-undo { };
+
   haskell-unicode-input-method = melpaBuild {
     pname = "emacs-haskell-unicode-input-method";
     version = "20110905.2307";