--- /dev/null
+;; Author: Dmitry Gutov <dgutov@yandex.ru>
+;; URL: https://github.com/dgutov/diff-hl
+
+;; This file is not part of GNU Emacs.
+
+;; This file 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.
+
+;; This file 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 <http://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:
+
+;;;###autoload
+(define-minor-mode diff-hl-amend-mode
+ "Show changes against the second-last revision in `diff-hl-mode'.
+Most useful with VCSes that support rewriting local commits, and
+'amending' the most recent one in particular.
+Currently only supports Git, Mercurial and Bazaar."
+ :lighter " Amend"
+ (if diff-hl-amend-mode
+ (progn
+ (if vc-mode
+ (diff-hl-amend-set)
+ (add-hook 'find-file-hook 'diff-hl-amend-setup nil t))
+ (add-hook 'after-revert-hook 'diff-hl-amend-setup nil t))
+ (remove-hook 'find-file-hook 'diff-hl-amend-setup t)
+ (remove-hook 'after-revert-hook 'diff-hl-amend-setup t)
+ (setq-local diff-hl-reference-revision nil))
+ (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)
+
+(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)))
:group 'diff-hl\r
:type 'boolean)\r
\r
+(defvar diff-hl-reference-revision nil\r
+ "Revision to diff against. nil means the most recent one.")\r
+\r
(defun diff-hl-define-bitmaps ()\r
(let* ((scale (if (and (boundp 'text-scale-mode-amount)\r
(numberp text-scale-mode-amount))\r
((or (eq state 'edited)\r
(and (eq state 'up-to-date)\r
;; VC state is stale in after-revert-hook.\r
- revert-buffer-in-progress-p))\r
+ (or revert-buffer-in-progress-p\r
+ ;; Diffing against an older revision.\r
+ diff-hl-reference-revision)))\r
(let* ((buf-name " *diff-hl* ")\r
+ diff-auto-refine-mode\r
res)\r
(diff-hl-with-diff-switches\r
- (vc-call-backend backend 'diff (list file) nil nil buf-name))\r
+ (vc-call-backend backend 'diff (list file)\r
+ diff-hl-reference-revision nil\r
+ buf-name))\r
(with-current-buffer buf-name\r
(goto-char (point-min))\r
(unless (eobp)\r
(vc-buffer-sync)\r
(let* ((line (line-number-at-pos))\r
(buffer (current-buffer)))\r
- (vc-diff-internal t (vc-deduce-fileset) nil nil t)\r
+ (vc-diff-internal t (vc-deduce-fileset) diff-hl-reference-revision nil t)\r
(vc-exec-after `(if (< (line-number-at-pos (point-max)) 3)\r
(with-current-buffer ,buffer (diff-hl-remove-overlays))\r
(diff-hl-diff-skip-to ,line)\r
(fileset (vc-deduce-fileset)))\r
(unwind-protect\r
(progn\r
- (vc-diff-internal nil fileset nil nil nil diff-buffer)\r
+ (vc-diff-internal nil fileset diff-hl-reference-revision nil\r
+ nil diff-buffer)\r
(vc-exec-after\r
`(let (beg-line end-line)\r
(when (eobp)\r