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