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;; Copyright (C) 2012-2013, 2020-2024 Free Software Foundation, Inc. -*- lexical-binding: t -*-
;; Author: Dmitry Gutov <dmitry@gutov.dev>
;; URL: https://github.com/dgutov/diff-hl
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Toggle in the current buffer with `M-x diff-hl-amend-mode'.
;; Toggle in all buffers with `M-x global-diff-hl-amend-mode'.
;;; Code:
(require 'diff-hl)
;;;###autoload
(define-minor-mode diff-hl-amend-mode
"Show changes against the second-last revision in `diff-hl-mode'.
Most useful with backends that support rewriting local commits,
and most importantly, \"amending\" the most recent one.
Currently only supports Git, Mercurial and Bazaar."
:lighter " Amend"
(if diff-hl-amend-mode
(progn
(diff-hl-amend-setup)
(add-hook 'after-revert-hook 'diff-hl-amend-setup nil t))
(remove-hook 'after-revert-hook 'diff-hl-amend-setup t)
(kill-local-variable 'diff-hl-reference-revision))
(when diff-hl-mode
(diff-hl-update)))
(defun diff-hl-amend-setup ()
(let ((backend (vc-backend buffer-file-name)))
(when backend
(setq-local diff-hl-reference-revision
(cl-case backend
(Git
"HEAD^")
(Hg
"-2")
(Bzr
"revno:-2"))))))
;;;###autoload
(define-globalized-minor-mode global-diff-hl-amend-mode diff-hl-amend-mode
turn-on-diff-hl-amend-mode
:group 'diff-hl)
(defun turn-on-diff-hl-amend-mode ()
"Turn on `diff-hl-amend-mode' in a buffer if appropriate."
(and buffer-file-name (diff-hl-amend-mode 1)))
(provide 'diff-hl-amend)
;;; diff-hl-amend.el ends here
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