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1359 lines
50 KiB
EmacsLisp
1359 lines
50 KiB
EmacsLisp
;;; diff-mode.el --- a mode for viewing/editing context diffs
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;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
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;; Free Software Foundation, Inc.
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;; Author: Stefan Monnier <monnier@cs.yale.edu>
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;; Keywords: convenience patch diff
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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 2, or (at your option)
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;; 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; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Provides support for font-lock, outline, navigation
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;; commands, editing and various conversions as well as jumping
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;; to the corresponding source file.
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;; Inspired by Pavel Machek's patch-mode.el (<pavel@@atrey.karlin.mff.cuni.cz>)
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;; Some efforts were spent to have it somewhat compatible with XEmacs'
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;; diff-mode as well as with compilation-minor-mode
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;; Bugs:
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;; - Reverse doesn't work with normal diffs.
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;; Todo:
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;; - Add a `delete-after-apply' so C-c C-a automatically deletes hunks.
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;; Also allow C-c C-a to delete already-applied hunks.
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;;
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;; - Try `diff <file> <hunk>' to try and fuzzily discover the source location
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;; of a hunk. Show then the changes between <file> and <hunk> and make it
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;; possible to apply them to <file>, <hunk-src>, or <hunk-dst>.
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;; Or maybe just make it into a ".rej to diff3-markers converter".
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;;
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;; - Refine hunk on a word-by-word basis.
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;;
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;; - Handle `diff -b' output in context->unified.
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;;; Code:
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(eval-when-compile (require 'cl))
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(defgroup diff-mode ()
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"Major mode for viewing/editing diffs"
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:version "21.1"
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:group 'tools
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:group 'diff)
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(defcustom diff-default-read-only nil
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"If non-nil, `diff-mode' buffers default to being read-only."
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:type 'boolean
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:group 'diff-mode)
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(defcustom diff-jump-to-old-file nil
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"*Non-nil means `diff-goto-source' jumps to the old file.
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Else, it jumps to the new file."
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:type '(boolean))
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(defcustom diff-update-on-the-fly t
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"*Non-nil means hunk headers are kept up-to-date on-the-fly.
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When editing a diff file, the line numbers in the hunk headers
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need to be kept consistent with the actual diff. This can
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either be done on the fly (but this sometimes interacts poorly with the
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undo mechanism) or whenever the file is written (can be slow
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when editing big diffs)."
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:type '(boolean))
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(defcustom diff-advance-after-apply-hunk t
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"*Non-nil means `diff-apply-hunk' will move to the next hunk after applying."
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:type 'boolean)
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(defcustom diff-mode-hook nil
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"Run after setting up the `diff-mode' major mode."
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:type 'hook
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:options '(diff-delete-empty-files diff-make-unified))
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(defvar diff-outline-regexp
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"\\([*+][*+][*+] [^0-9]\\|@@ ...\\|\\*\\*\\* [0-9].\\|--- [0-9]..\\)")
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;;;;
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;;;; keymap, menu, ...
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;;;;
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(easy-mmode-defmap diff-mode-shared-map
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'(;; From Pavel Machek's patch-mode.
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("n" . diff-hunk-next)
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("N" . diff-file-next)
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("p" . diff-hunk-prev)
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("P" . diff-file-prev)
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("k" . diff-hunk-kill)
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("K" . diff-file-kill)
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;; From compilation-minor-mode.
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("}" . diff-file-next)
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("{" . diff-file-prev)
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("\C-m" . diff-goto-source)
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([mouse-2] . diff-goto-source)
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;; From XEmacs' diff-mode.
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("W" . widen)
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;;("." . diff-goto-source) ;display-buffer
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;;("f" . diff-goto-source) ;find-file
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("o" . diff-goto-source) ;other-window
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;;("w" . diff-goto-source) ;other-frame
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;;("N" . diff-narrow)
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;;("h" . diff-show-header)
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;;("j" . diff-show-difference) ;jump to Nth diff
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;;("q" . diff-quit)
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(" " . scroll-up)
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("\177" . scroll-down)
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;; Our very own bindings.
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("A" . diff-ediff-patch)
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("r" . diff-restrict-view)
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("R" . diff-reverse-direction)
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("U" . diff-context->unified)
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("C" . diff-unified->context)
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("q" . quit-window))
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"Basic keymap for `diff-mode', bound to various prefix keys.")
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(easy-mmode-defmap diff-mode-map
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`(("\e" . ,diff-mode-shared-map)
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;; From compilation-minor-mode.
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("\C-c\C-c" . diff-goto-source)
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;; Misc operations.
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("\C-c\C-r" . diff-refine-hunk)
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("\C-c\C-s" . diff-split-hunk)
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("\C-c\C-a" . diff-apply-hunk)
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("\C-c\C-t" . diff-test-hunk)
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("\C-c\C-f" . next-error-follow-minor-mode))
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"Keymap for `diff-mode'. See also `diff-mode-shared-map'.")
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(easy-menu-define diff-mode-menu diff-mode-map
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"Menu for `diff-mode'."
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'("Diff"
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["Jump to Source" diff-goto-source t]
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["Apply hunk" diff-apply-hunk t]
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["Apply diff with Ediff" diff-ediff-patch t]
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["-----" nil nil]
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["Reverse direction" diff-reverse-direction t]
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["Context -> Unified" diff-context->unified t]
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["Unified -> Context" diff-unified->context t]
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;;["Fixup Headers" diff-fixup-modifs (not buffer-read-only)]
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))
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(defcustom diff-minor-mode-prefix "\C-c="
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"Prefix key for `diff-minor-mode' commands."
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:type '(choice (string "\e") (string "C-c=") string))
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(easy-mmode-defmap diff-minor-mode-map
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`((,diff-minor-mode-prefix . ,diff-mode-shared-map))
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"Keymap for `diff-minor-mode'. See also `diff-mode-shared-map'.")
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;;;;
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;;;; font-lock support
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;;;;
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(defface diff-header-face
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'((((class color) (min-colors 88) (background light))
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:background "grey85")
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(((class color) (min-colors 88) (background dark))
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:background "grey45")
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(((class color) (background light))
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:foreground "blue1" :weight bold)
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(((class color) (background dark))
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:foreground "green" :weight bold)
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(t :weight bold))
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"`diff-mode' face inherited by hunk and index header faces.")
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(defvar diff-header-face 'diff-header-face)
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(defface diff-file-header-face
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'((((class color) (min-colors 88) (background light))
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:background "grey70" :weight bold)
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(((class color) (min-colors 88) (background dark))
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:background "grey60" :weight bold)
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(((class color) (background light))
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:foreground "yellow" :weight bold)
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(((class color) (background dark))
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:foreground "cyan" :weight bold)
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(t :weight bold)) ; :height 1.3
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"`diff-mode' face used to highlight file header lines.")
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(defvar diff-file-header-face 'diff-file-header-face)
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(defface diff-index-face
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'((t :inherit diff-file-header-face))
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"`diff-mode' face used to highlight index header lines.")
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(defvar diff-index-face 'diff-index-face)
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(defface diff-hunk-header-face
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'((t :inherit diff-header-face))
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"`diff-mode' face used to highlight hunk header lines.")
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(defvar diff-hunk-header-face 'diff-hunk-header-face)
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(defface diff-removed-face
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'((t :inherit diff-changed-face))
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"`diff-mode' face used to highlight removed lines.")
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(defvar diff-removed-face 'diff-removed-face)
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(defface diff-added-face
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'((t :inherit diff-changed-face))
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"`diff-mode' face used to highlight added lines.")
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(defvar diff-added-face 'diff-added-face)
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(defface diff-changed-face
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'((((type tty pc) (class color) (background light))
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:foreground "magenta" :weight bold :slant italic)
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(((type tty pc) (class color) (background dark))
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:foreground "yellow" :weight bold :slant italic))
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"`diff-mode' face used to highlight changed lines.")
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(defvar diff-changed-face 'diff-changed-face)
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(defface diff-function-face
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'((t :inherit diff-context-face))
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"`diff-mode' face used to highlight function names produced by \"diff -p\".")
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(defvar diff-function-face 'diff-function-face)
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(defface diff-context-face
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'((((class color) (background light))
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:foreground "grey50")
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(((class color) (background dark))
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:foreground "grey70"))
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"`diff-mode' face used to highlight context and other side-information.")
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(defvar diff-context-face 'diff-context-face)
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(defface diff-nonexistent-face
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'((t :inherit diff-file-header-face))
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"`diff-mode' face used to highlight nonexistent files in recursive diffs.")
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(defvar diff-nonexistent-face 'diff-nonexistent-face)
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(defconst diff-yank-handler '(diff-yank-function))
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(defun diff-yank-function (text)
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;; FIXME: the yank-handler is now called separately on each piece of text
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;; with a yank-handler property, so the next-single-property-change call
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;; below will always return nil :-( --stef
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(let ((mixed (next-single-property-change 0 'yank-handler text))
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(start (point)))
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;; First insert the text.
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(insert text)
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;; If the text does not include any diff markers and if we're not
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;; yanking back into a diff-mode buffer, get rid of the prefixes.
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(unless (or mixed (derived-mode-p 'diff-mode))
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(undo-boundary) ; Just in case the user wanted the prefixes.
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(let ((re (save-excursion
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(if (re-search-backward "^[><!][ \t]" start t)
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(if (eq (char-after) ?!)
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"^[!+- ][ \t]" "^[<>][ \t]")
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"^[ <>!+-]"))))
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(save-excursion
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(while (re-search-backward re start t)
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(replace-match "" t t)))))))
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(defvar diff-font-lock-keywords
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`(("^\\(@@ -[0-9,]+ \\+[0-9,]+ @@\\)\\(.*\\)$" ;unified
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(1 diff-hunk-header-face)
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(2 diff-function-face))
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("^--- .+ ----$" . diff-hunk-header-face) ;context
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("^\\(\\*\\{15\\}\\)\\(.*\\)$" ;context
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(1 diff-hunk-header-face)
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(2 diff-function-face))
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("^\\*\\*\\* .+ \\*\\*\\*\\*". diff-hunk-header-face) ;context
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("^\\(---\\|\\+\\+\\+\\|\\*\\*\\*\\) \\(\\S-+\\)\\(.*[^*-]\\)?\n"
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(0 diff-header-face) (2 diff-file-header-face prepend))
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("^[0-9,]+[acd][0-9,]+$" . diff-hunk-header-face)
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("^!.*\n" (0 diff-changed-face))
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("^[+>].*\n" (0 diff-added-face))
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("^[-<].*\n" (0 diff-removed-face))
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("^Index: \\(.+\\).*\n" (0 diff-header-face) (1 diff-index-face prepend))
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("^Only in .*\n" . diff-nonexistent-face)
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("^#.*" . font-lock-string-face)
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("^[^-=+*!<>].*\n" (0 diff-context-face))))
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(defconst diff-font-lock-defaults
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'(diff-font-lock-keywords t nil nil nil (font-lock-multiline . nil)))
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(defvar diff-imenu-generic-expression
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;; Prefer second name as first is most likely to be a backup or
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;; version-control name. The [\t\n] at the end of the unidiff pattern
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;; catches Debian source diff files (which lack the trailing date).
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'((nil "\\+\\+\\+\\ \\([^\t\n]+\\)[\t\n]" 1) ; unidiffs
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(nil "^--- \\([^\t\n]+\\)\t.*\n\\*" 1))) ; context diffs
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;;;;
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;;;; Movement
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;;;;
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(defconst diff-hunk-header-re "^\\(@@ -[0-9,]+ \\+[0-9,]+ @@.*\\|\\*\\{15\\}.*\n\\*\\*\\* .+ \\*\\*\\*\\*\\|[0-9]+\\(,[0-9]+\\)?[acd][0-9]+\\(,[0-9]+\\)?\\)$")
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(defconst diff-file-header-re (concat "^\\(--- .+\n\\+\\+\\+ \\|\\*\\*\\* .+\n--- \\|[^-+!<>0-9@* ]\\).+\n" (substring diff-hunk-header-re 1)))
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(defvar diff-narrowed-to nil)
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(defun diff-end-of-hunk (&optional style)
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(when (looking-at diff-hunk-header-re)
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(unless style
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;; Especially important for unified (because headers are ambiguous).
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(setq style (cdr (assq (char-after) '((?@ . unified) (?* . context))))))
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(goto-char (match-end 0)))
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(let ((end (and (re-search-forward (case style
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;; A `unified' header is ambiguous.
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(unified (concat "^[^-+# \\]\\|"
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diff-file-header-re))
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(context "^[^-+#! \\]")
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(normal "^[^<>#\\]")
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(t "^[^-+#!<> \\]"))
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nil t)
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(match-beginning 0))))
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;; The return value is used by easy-mmode-define-navigation.
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(goto-char (or end (point-max)))))
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(defun diff-beginning-of-hunk ()
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(beginning-of-line)
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(unless (looking-at diff-hunk-header-re)
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(forward-line 1)
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(condition-case ()
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(re-search-backward diff-hunk-header-re)
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(error (error "Can't find the beginning of the hunk")))))
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(defun diff-beginning-of-file ()
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(beginning-of-line)
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(unless (looking-at diff-file-header-re)
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(forward-line 2)
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(condition-case ()
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(re-search-backward diff-file-header-re)
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(error (error "Can't find the beginning of the file")))))
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(defun diff-end-of-file ()
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(re-search-forward "^[-+#!<>0-9@* \\]" nil t)
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(re-search-forward (concat "^[^-+#!<>0-9@* \\]\\|" diff-file-header-re)
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nil 'move)
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(if (match-beginning 1)
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(goto-char (match-beginning 1))
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(beginning-of-line)))
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;; Define diff-{hunk,file}-{prev,next}
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(easy-mmode-define-navigation
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diff-hunk diff-hunk-header-re "hunk" diff-end-of-hunk diff-restrict-view)
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(easy-mmode-define-navigation
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diff-file diff-file-header-re "file" diff-end-of-hunk)
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(defun diff-restrict-view (&optional arg)
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"Restrict the view to the current hunk.
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If the prefix ARG is given, restrict the view to the current file instead."
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(interactive "P")
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(save-excursion
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(if arg (diff-beginning-of-file) (diff-beginning-of-hunk))
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(narrow-to-region (point)
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(progn (if arg (diff-end-of-file) (diff-end-of-hunk))
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(point)))
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(set (make-local-variable 'diff-narrowed-to) (if arg 'file 'hunk))))
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(defun diff-hunk-kill ()
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"Kill current hunk."
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(interactive)
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(diff-beginning-of-hunk)
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(let* ((start (point))
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(nexthunk (when (re-search-forward diff-hunk-header-re nil t)
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(match-beginning 0)))
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(firsthunk (ignore-errors
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(goto-char start)
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(diff-beginning-of-file) (diff-hunk-next) (point)))
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(nextfile (ignore-errors (diff-file-next) (point))))
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(goto-char start)
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(if (and firsthunk (= firsthunk start)
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(or (null nexthunk)
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(and nextfile (> nexthunk nextfile))))
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;; It's the only hunk for this file, so kill the file.
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(diff-file-kill)
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(diff-end-of-hunk)
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(kill-region start (point)))))
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(defun diff-file-kill ()
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"Kill current file's hunks."
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(interactive)
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(diff-beginning-of-file)
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(let* ((start (point))
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(prevhunk (save-excursion
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(ignore-errors
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(diff-hunk-prev) (point))))
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(index (save-excursion
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(re-search-backward "^Index: " prevhunk t))))
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(when index (setq start index))
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(diff-end-of-file)
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(if (looking-at "^\n") (forward-char 1)) ;`tla' generates such diffs.
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(kill-region start (point))))
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(defun diff-kill-junk ()
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"Kill spurious empty diffs."
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(interactive)
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(save-excursion
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(let ((inhibit-read-only t))
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(goto-char (point-min))
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(while (re-search-forward (concat "^\\(Index: .*\n\\)"
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"\\([^-+!* <>].*\n\\)*?"
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"\\(\\(Index:\\) \\|"
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diff-file-header-re "\\)")
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nil t)
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(delete-region (if (match-end 4) (match-beginning 0) (match-end 1))
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(match-beginning 3))
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(beginning-of-line)))))
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(defun diff-count-matches (re start end)
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(save-excursion
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(let ((n 0))
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(goto-char start)
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(while (re-search-forward re end t) (incf n))
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n)))
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(defun diff-split-hunk ()
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"Split the current (unified diff) hunk at point into two hunks."
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(interactive)
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(beginning-of-line)
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(let ((pos (point))
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(start (progn (diff-beginning-of-hunk) (point))))
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(unless (looking-at "@@ -\\([0-9]+\\),[0-9]+ \\+\\([0-9]+\\),[0-9]+ @@")
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(error "diff-split-hunk only works on unified context diffs"))
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(forward-line 1)
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(let* ((start1 (string-to-number (match-string 1)))
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||
(start2 (string-to-number (match-string 2)))
|
||
(newstart1 (+ start1 (diff-count-matches "^[- \t]" (point) pos)))
|
||
(newstart2 (+ start2 (diff-count-matches "^[+ \t]" (point) pos))))
|
||
(goto-char pos)
|
||
;; Hopefully the after-change-function will not screw us over.
|
||
(insert "@@ -" (number-to-string newstart1) ",1 +"
|
||
(number-to-string newstart2) ",1 @@\n")
|
||
;; Fix the original hunk-header.
|
||
(diff-fixup-modifs start pos))))
|
||
|
||
|
||
;;;;
|
||
;;;; jump to other buffers
|
||
;;;;
|
||
|
||
(defvar diff-remembered-files-alist nil)
|
||
|
||
(defun diff-filename-drop-dir (file)
|
||
(when (string-match "/" file) (substring file (match-end 0))))
|
||
|
||
(defun diff-merge-strings (ancestor from to)
|
||
"Merge the diff between ANCESTOR and FROM into TO.
|
||
Returns the merged string if successful or nil otherwise.
|
||
The strings are assumed not to contain any \"\\n\" (i.e. end of line).
|
||
If ANCESTOR = FROM, returns TO.
|
||
If ANCESTOR = TO, returns FROM.
|
||
The heuristic is simplistic and only really works for cases
|
||
like \(diff-merge-strings \"b/foo\" \"b/bar\" \"/a/c/foo\")."
|
||
;; Ideally, we want:
|
||
;; AMB ANB CMD -> CND
|
||
;; but that's ambiguous if `foo' or `bar' is empty:
|
||
;; a/foo a/foo1 b/foo.c -> b/foo1.c but not 1b/foo.c or b/foo.c1
|
||
(let ((str (concat ancestor "\n" from "\n" to)))
|
||
(when (and (string-match (concat
|
||
"\\`\\(.*?\\)\\(.*\\)\\(.*\\)\n"
|
||
"\\1\\(.*\\)\\3\n"
|
||
"\\(.*\\(\\2\\).*\\)\\'") str)
|
||
(equal to (match-string 5 str)))
|
||
(concat (substring str (match-beginning 5) (match-beginning 6))
|
||
(match-string 4 str)
|
||
(substring str (match-end 6) (match-end 5))))))
|
||
|
||
(defun diff-tell-file-name (old name)
|
||
"Tell Emacs where the find the source file of the current hunk.
|
||
If the OLD prefix arg is passed, tell the file NAME of the old file."
|
||
(interactive
|
||
(let* ((old current-prefix-arg)
|
||
(fs (diff-hunk-file-names current-prefix-arg)))
|
||
(unless fs (error "No file name to look for"))
|
||
(list old (read-file-name (format "File for %s: " (car fs))
|
||
nil (diff-find-file-name old) t))))
|
||
(let ((fs (diff-hunk-file-names old)))
|
||
(unless fs (error "No file name to look for"))
|
||
(push (cons fs name) diff-remembered-files-alist)))
|
||
|
||
(defun diff-hunk-file-names (&optional old)
|
||
"Give the list of file names textually mentioned for the current hunk."
|
||
(save-excursion
|
||
(unless (looking-at diff-file-header-re)
|
||
(or (ignore-errors (diff-beginning-of-file))
|
||
(re-search-forward diff-file-header-re nil t)))
|
||
(let ((limit (save-excursion
|
||
(condition-case ()
|
||
(progn (diff-hunk-prev) (point))
|
||
(error (point-min)))))
|
||
(header-files
|
||
(if (looking-at "[-*][-*][-*] \\(\\S-+\\)\\(\\s-.*\\)?\n[-+][-+][-+] \\(\\S-+\\)")
|
||
(list (if old (match-string 1) (match-string 3))
|
||
(if old (match-string 3) (match-string 1)))
|
||
(forward-line 1) nil)))
|
||
(delq nil
|
||
(append
|
||
(when (and (not old)
|
||
(save-excursion
|
||
(re-search-backward "^Index: \\(.+\\)" limit t)))
|
||
(list (match-string 1)))
|
||
header-files
|
||
(when (re-search-backward
|
||
"^diff \\(-\\S-+ +\\)*\\(\\S-+\\)\\( +\\(\\S-+\\)\\)?"
|
||
nil t)
|
||
(list (if old (match-string 2) (match-string 4))
|
||
(if old (match-string 4) (match-string 2)))))))))
|
||
|
||
(defun diff-find-file-name (&optional old)
|
||
"Return the file corresponding to the current patch.
|
||
Non-nil OLD means that we want the old file."
|
||
(save-excursion
|
||
(unless (looking-at diff-file-header-re)
|
||
(or (ignore-errors (diff-beginning-of-file))
|
||
(re-search-forward diff-file-header-re nil t)))
|
||
(let ((fs (diff-hunk-file-names old)))
|
||
(or
|
||
;; use any previously used preference
|
||
(cdr (assoc fs diff-remembered-files-alist))
|
||
;; try to be clever and use previous choices as an inspiration
|
||
(dolist (rf diff-remembered-files-alist)
|
||
(let ((newfile (diff-merge-strings (caar rf) (car fs) (cdr rf))))
|
||
(if (and newfile (file-exists-p newfile)) (return newfile))))
|
||
;; look for each file in turn. If none found, try again but
|
||
;; ignoring the first level of directory, ...
|
||
(do* ((files fs (delq nil (mapcar 'diff-filename-drop-dir files)))
|
||
(file nil nil))
|
||
((or (null files)
|
||
(setq file (do* ((files files (cdr files))
|
||
(file (car files) (car files)))
|
||
((or (null file) (file-exists-p file))
|
||
file))))
|
||
file))
|
||
;; <foo>.rej patches implicitly apply to <foo>
|
||
(and (string-match "\\.rej\\'" (or buffer-file-name ""))
|
||
(let ((file (substring buffer-file-name 0 (match-beginning 0))))
|
||
(when (file-exists-p file) file)))
|
||
;; if all else fails, ask the user
|
||
(let ((file (read-file-name (format "Use file %s: " (or (first fs) ""))
|
||
nil (first fs) t (first fs))))
|
||
(set (make-local-variable 'diff-remembered-files-alist)
|
||
(cons (cons fs file) diff-remembered-files-alist))
|
||
file)))))
|
||
|
||
|
||
(defun diff-ediff-patch ()
|
||
"Call `ediff-patch-file' on the current buffer."
|
||
(interactive)
|
||
(condition-case err
|
||
(ediff-patch-file nil (current-buffer))
|
||
(wrong-number-of-arguments (ediff-patch-file))))
|
||
|
||
;;;;
|
||
;;;; Conversion functions
|
||
;;;;
|
||
|
||
;;(defvar diff-inhibit-after-change nil
|
||
;; "Non-nil means inhibit `diff-mode's after-change functions.")
|
||
|
||
(defun diff-unified->context (start end)
|
||
"Convert unified diffs to context diffs.
|
||
START and END are either taken from the region (if a prefix arg is given) or
|
||
else cover the whole bufer."
|
||
(interactive (if current-prefix-arg
|
||
(list (mark) (point))
|
||
(list (point-min) (point-max))))
|
||
(unless (markerp end) (setq end (copy-marker end)))
|
||
(let (;;(diff-inhibit-after-change t)
|
||
(inhibit-read-only t))
|
||
(save-excursion
|
||
(goto-char start)
|
||
(while (and (re-search-forward "^\\(\\(---\\) .+\n\\(\\+\\+\\+\\) .+\\|@@ -\\([0-9]+\\),\\([0-9]+\\) \\+\\([0-9]+\\),\\([0-9]+\\) @@.*\\)$" nil t)
|
||
(< (point) end))
|
||
(combine-after-change-calls
|
||
(if (match-beginning 2)
|
||
;; we matched a file header
|
||
(progn
|
||
;; use reverse order to make sure the indices are kept valid
|
||
(replace-match "---" t t nil 3)
|
||
(replace-match "***" t t nil 2))
|
||
;; we matched a hunk header
|
||
(let ((line1 (match-string 4))
|
||
(lines1 (match-string 5))
|
||
(line2 (match-string 6))
|
||
(lines2 (match-string 7)))
|
||
(replace-match
|
||
(concat "***************\n*** " line1 ","
|
||
(number-to-string (+ (string-to-number line1)
|
||
(string-to-number lines1)
|
||
-1)) " ****"))
|
||
(forward-line 1)
|
||
(save-restriction
|
||
(narrow-to-region (point)
|
||
(progn (diff-end-of-hunk 'unified) (point)))
|
||
(let ((hunk (buffer-string)))
|
||
(goto-char (point-min))
|
||
(if (not (save-excursion (re-search-forward "^-" nil t)))
|
||
(delete-region (point) (point-max))
|
||
(goto-char (point-max))
|
||
(let ((modif nil) last-pt)
|
||
(while (progn (setq last-pt (point))
|
||
(= (forward-line -1) 0))
|
||
(case (char-after)
|
||
(? (insert " ") (setq modif nil) (backward-char 1))
|
||
(?+ (delete-region (point) last-pt) (setq modif t))
|
||
(?- (if (not modif)
|
||
(progn (forward-char 1)
|
||
(insert " "))
|
||
(delete-char 1)
|
||
(insert "! "))
|
||
(backward-char 2))
|
||
(?\\ (when (save-excursion (forward-line -1)
|
||
(= (char-after) ?+))
|
||
(delete-region (point) last-pt) (setq modif t)))
|
||
(t (setq modif nil))))))
|
||
(goto-char (point-max))
|
||
(save-excursion
|
||
(insert "--- " line2 ","
|
||
(number-to-string (+ (string-to-number line2)
|
||
(string-to-number lines2)
|
||
-1)) " ----\n" hunk))
|
||
;;(goto-char (point-min))
|
||
(forward-line 1)
|
||
(if (not (save-excursion (re-search-forward "^+" nil t)))
|
||
(delete-region (point) (point-max))
|
||
(let ((modif nil) (delete nil))
|
||
(while (not (eobp))
|
||
(case (char-after)
|
||
(? (insert " ") (setq modif nil) (backward-char 1))
|
||
(?- (setq delete t) (setq modif t))
|
||
(?+ (if (not modif)
|
||
(progn (forward-char 1)
|
||
(insert " "))
|
||
(delete-char 1)
|
||
(insert "! "))
|
||
(backward-char 2))
|
||
(?\\ (when (save-excursion (forward-line 1)
|
||
(not (eobp)))
|
||
(setq delete t) (setq modif t)))
|
||
(t (setq modif nil)))
|
||
(let ((last-pt (point)))
|
||
(forward-line 1)
|
||
(when delete
|
||
(delete-region last-pt (point))
|
||
(setq delete nil)))))))))))))))
|
||
|
||
(defun diff-context->unified (start end)
|
||
"Convert context diffs to unified diffs.
|
||
START and END are either taken from the region (if a prefix arg is given) or
|
||
else cover the whole bufer."
|
||
(interactive (if current-prefix-arg
|
||
(list (mark) (point))
|
||
(list (point-min) (point-max))))
|
||
(unless (markerp end) (setq end (copy-marker end)))
|
||
(let (;;(diff-inhibit-after-change t)
|
||
(inhibit-read-only t))
|
||
(save-excursion
|
||
(goto-char start)
|
||
(while (and (re-search-forward "^\\(\\(\\*\\*\\*\\) .+\n\\(---\\) .+\\|\\*\\{15\\}.*\n\\*\\*\\* \\([0-9]+\\),\\(-?[0-9]+\\) \\*\\*\\*\\*\\)$" nil t)
|
||
(< (point) end))
|
||
(combine-after-change-calls
|
||
(if (match-beginning 2)
|
||
;; we matched a file header
|
||
(progn
|
||
;; use reverse order to make sure the indices are kept valid
|
||
(replace-match "+++" t t nil 3)
|
||
(replace-match "---" t t nil 2))
|
||
;; we matched a hunk header
|
||
(let ((line1s (match-string 4))
|
||
(line1e (match-string 5))
|
||
(pt1 (match-beginning 0)))
|
||
(replace-match "")
|
||
(unless (re-search-forward
|
||
"^--- \\([0-9]+\\),\\(-?[0-9]+\\) ----$" nil t)
|
||
(error "Can't find matching `--- n1,n2 ----' line"))
|
||
(let ((line2s (match-string 1))
|
||
(line2e (match-string 2))
|
||
(pt2 (progn
|
||
(delete-region (progn (beginning-of-line) (point))
|
||
(progn (forward-line 1) (point)))
|
||
(point-marker))))
|
||
(goto-char pt1)
|
||
(forward-line 1)
|
||
(while (< (point) pt2)
|
||
(case (char-after)
|
||
((?! ?-) (delete-char 2) (insert "-") (forward-line 1))
|
||
(?\ ;merge with the other half of the chunk
|
||
(let* ((endline2
|
||
(save-excursion
|
||
(goto-char pt2) (forward-line 1) (point)))
|
||
(c (char-after pt2)))
|
||
(case c
|
||
((?! ?+)
|
||
(insert "+"
|
||
(prog1 (buffer-substring (+ pt2 2) endline2)
|
||
(delete-region pt2 endline2))))
|
||
(?\ ;FIXME: check consistency
|
||
(delete-region pt2 endline2)
|
||
(delete-char 1)
|
||
(forward-line 1))
|
||
(?\\ (forward-line 1))
|
||
(t (delete-char 1) (forward-line 1)))))
|
||
(t (forward-line 1))))
|
||
(while (looking-at "[+! ] ")
|
||
(if (/= (char-after) ?!) (forward-char 1)
|
||
(delete-char 1) (insert "+"))
|
||
(delete-char 1) (forward-line 1))
|
||
(save-excursion
|
||
(goto-char pt1)
|
||
(insert "@@ -" line1s ","
|
||
(number-to-string (- (string-to-number line1e)
|
||
(string-to-number line1s)
|
||
-1))
|
||
" +" line2s ","
|
||
(number-to-string (- (string-to-number line2e)
|
||
(string-to-number line2s)
|
||
-1)) " @@"))))))))))
|
||
|
||
(defun diff-reverse-direction (start end)
|
||
"Reverse the direction of the diffs.
|
||
START and END are either taken from the region (if a prefix arg is given) or
|
||
else cover the whole bufer."
|
||
(interactive (if current-prefix-arg
|
||
(list (mark) (point))
|
||
(list (point-min) (point-max))))
|
||
(unless (markerp end) (setq end (copy-marker end)))
|
||
(let (;;(diff-inhibit-after-change t)
|
||
(inhibit-read-only t))
|
||
(save-excursion
|
||
(goto-char start)
|
||
(while (and (re-search-forward "^\\(\\([-*][-*][-*] \\)\\(.+\\)\n\\([-+][-+][-+] \\)\\(.+\\)\\|\\*\\{15\\}.*\n\\*\\*\\* \\(.+\\) \\*\\*\\*\\*\\|@@ -\\([0-9,]+\\) \\+\\([0-9,]+\\) @@.*\\)$" nil t)
|
||
(< (point) end))
|
||
(combine-after-change-calls
|
||
(cond
|
||
;; a file header
|
||
((match-beginning 2) (replace-match "\\2\\5\n\\4\\3" nil))
|
||
;; a context-diff hunk header
|
||
((match-beginning 6)
|
||
(let ((pt-lines1 (match-beginning 6))
|
||
(lines1 (match-string 6)))
|
||
(replace-match "" nil nil nil 6)
|
||
(forward-line 1)
|
||
(let ((half1s (point)))
|
||
(while (looking-at "[-! \\][ \t]\\|#")
|
||
(when (= (char-after) ?-) (delete-char 1) (insert "+"))
|
||
(forward-line 1))
|
||
(let ((half1 (delete-and-extract-region half1s (point))))
|
||
(unless (looking-at "^--- \\([0-9]+,-?[0-9]+\\) ----$")
|
||
(insert half1)
|
||
(error "Can't find matching `--- n1,n2 ----' line"))
|
||
(let ((str1 (match-string 1)))
|
||
(replace-match lines1 nil nil nil 1)
|
||
(forward-line 1)
|
||
(let ((half2s (point)))
|
||
(while (looking-at "[!+ \\][ \t]\\|#")
|
||
(when (= (char-after) ?+) (delete-char 1) (insert "-"))
|
||
(forward-line 1))
|
||
(let ((half2 (delete-and-extract-region half2s (point))))
|
||
(insert (or half1 ""))
|
||
(goto-char half1s)
|
||
(insert (or half2 ""))))
|
||
(goto-char pt-lines1)
|
||
(insert str1))))))
|
||
;; a unified-diff hunk header
|
||
((match-beginning 7)
|
||
(replace-match "@@ -\\8 +\\7 @@" nil)
|
||
(forward-line 1)
|
||
(let ((c (char-after)) first last)
|
||
(while (case (setq c (char-after))
|
||
(?- (setq first (or first (point)))
|
||
(delete-char 1) (insert "+") t)
|
||
(?+ (setq last (or last (point)))
|
||
(delete-char 1) (insert "-") t)
|
||
((?\\ ?#) t)
|
||
(t (when (and first last (< first last))
|
||
(insert (delete-and-extract-region first last)))
|
||
(setq first nil last nil)
|
||
(equal ?\ c)))
|
||
(forward-line 1))))))))))
|
||
|
||
(defun diff-fixup-modifs (start end)
|
||
"Fixup the hunk headers (in case the buffer was modified).
|
||
START and END are either taken from the region (if a prefix arg is given) or
|
||
else cover the whole bufer."
|
||
(interactive (if current-prefix-arg
|
||
(list (mark) (point))
|
||
(list (point-min) (point-max))))
|
||
(let ((inhibit-read-only t))
|
||
(save-excursion
|
||
(goto-char end) (diff-end-of-hunk)
|
||
(let ((plus 0) (minus 0) (space 0) (bang 0))
|
||
(while (and (= (forward-line -1) 0) (<= start (point)))
|
||
(if (not (looking-at
|
||
(concat "@@ -[0-9,]+ \\+[0-9,]+ @@"
|
||
"\\|[-*][-*][-*] [0-9,]+ [-*][-*][-*][-*]$"
|
||
"\\|--- .+\n\\+\\+\\+ ")))
|
||
(case (char-after)
|
||
(?\s (incf space))
|
||
(?+ (incf plus))
|
||
(?- (incf minus))
|
||
(?! (incf bang))
|
||
((?\\ ?#) nil)
|
||
(t (setq space 0 plus 0 minus 0 bang 0)))
|
||
(cond
|
||
((looking-at "@@ -[0-9]+,\\([0-9]*\\) \\+[0-9]+,\\([0-9]*\\) @@.*$")
|
||
(let* ((old1 (match-string 1))
|
||
(old2 (match-string 2))
|
||
(new1 (number-to-string (+ space minus)))
|
||
(new2 (number-to-string (+ space plus))))
|
||
(unless (string= new2 old2) (replace-match new2 t t nil 2))
|
||
(unless (string= new1 old1) (replace-match new1 t t nil 1))))
|
||
((looking-at "--- \\([0-9]+\\),\\([0-9]*\\) ----$")
|
||
(when (> (+ space bang plus) 0)
|
||
(let* ((old1 (match-string 1))
|
||
(old2 (match-string 2))
|
||
(new (number-to-string
|
||
(+ space bang plus -1 (string-to-number old1)))))
|
||
(unless (string= new old2) (replace-match new t t nil 2)))))
|
||
((looking-at "\\*\\*\\* \\([0-9]+\\),\\(-?[0-9]*\\) \\*\\*\\*\\*$")
|
||
(when (> (+ space bang minus) 0)
|
||
(let* ((old (match-string 1))
|
||
(new (format
|
||
(concat "%0" (number-to-string (length old)) "d")
|
||
(+ space bang minus -1 (string-to-number old)))))
|
||
(unless (string= new old) (replace-match new t t nil 2))))))
|
||
(setq space 0 plus 0 minus 0 bang 0)))))))
|
||
|
||
;;;;
|
||
;;;; Hooks
|
||
;;;;
|
||
|
||
(defun diff-write-contents-hooks ()
|
||
"Fixup hunk headers if necessary."
|
||
(if (buffer-modified-p) (diff-fixup-modifs (point-min) (point-max)))
|
||
nil)
|
||
|
||
;; It turns out that making changes in the buffer from within an
|
||
;; *-change-function is asking for trouble, whereas making them
|
||
;; from a post-command-hook doesn't pose much problems
|
||
(defvar diff-unhandled-changes nil)
|
||
(defun diff-after-change-function (beg end len)
|
||
"Remember to fixup the hunk header.
|
||
See `after-change-functions' for the meaning of BEG, END and LEN."
|
||
;; Ignoring changes when inhibit-read-only is set is strictly speaking
|
||
;; incorrect, but it turns out that inhibit-read-only is normally not set
|
||
;; inside editing commands, while it tends to be set when the buffer gets
|
||
;; updated by an async process or by a conversion function, both of which
|
||
;; would rather not be uselessly slowed down by this hook.
|
||
(when (and (not undo-in-progress) (not inhibit-read-only))
|
||
(if diff-unhandled-changes
|
||
(setq diff-unhandled-changes
|
||
(cons (min beg (car diff-unhandled-changes))
|
||
(max end (cdr diff-unhandled-changes))))
|
||
(setq diff-unhandled-changes (cons beg end)))))
|
||
|
||
(defun diff-post-command-hook ()
|
||
"Fixup hunk headers if necessary."
|
||
(when (consp diff-unhandled-changes)
|
||
(ignore-errors
|
||
(save-excursion
|
||
(goto-char (car diff-unhandled-changes))
|
||
;; Maybe we've cut the end of the hunk before point.
|
||
(if (and (bolp) (not (bobp))) (backward-char 1))
|
||
;; We used to fixup modifs on all the changes, but it turns out
|
||
;; that it's safer not to do it on big changes, for example
|
||
;; when yanking a big diff, since we might then screw up perfectly
|
||
;; correct values. -stef
|
||
;; (unless (ignore-errors
|
||
;; (diff-beginning-of-hunk)
|
||
;; (save-excursion
|
||
;; (diff-end-of-hunk)
|
||
;; (> (point) (car diff-unhandled-changes))))
|
||
;; (goto-char (car diff-unhandled-changes))
|
||
;; (re-search-forward diff-hunk-header-re (cdr diff-unhandled-changes))
|
||
;; (diff-beginning-of-hunk))
|
||
;; (diff-fixup-modifs (point) (cdr diff-unhandled-changes))
|
||
(diff-beginning-of-hunk)
|
||
(when (save-excursion
|
||
(diff-end-of-hunk)
|
||
(>= (point) (cdr diff-unhandled-changes)))
|
||
(diff-fixup-modifs (point) (cdr diff-unhandled-changes)))))
|
||
(setq diff-unhandled-changes nil)))
|
||
|
||
(defun diff-next-error (arg reset)
|
||
;; Select a window that displays the current buffer so that point
|
||
;; movements are reflected in that window. Otherwise, the user might
|
||
;; never see the hunk corresponding to the source she's jumping to.
|
||
(pop-to-buffer (current-buffer))
|
||
(if reset (goto-char (point-min)))
|
||
(diff-hunk-next arg)
|
||
(diff-goto-source))
|
||
|
||
;;;###autoload
|
||
(define-derived-mode diff-mode fundamental-mode "Diff"
|
||
"Major mode for viewing/editing context diffs.
|
||
Supports unified and context diffs as well as (to a lesser extent)
|
||
normal diffs.
|
||
When the buffer is read-only, the ESC prefix is not necessary.
|
||
IF you edit the buffer manually, diff-mode will try to update the hunk
|
||
headers for you on-the-fly.
|
||
|
||
You can also switch between context diff and unified diff with \\[diff-context->unified],
|
||
or vice versa with \\[diff-unified->context] and you can also revert the direction of
|
||
a diff with \\[diff-reverse-direction]."
|
||
(set (make-local-variable 'font-lock-defaults) diff-font-lock-defaults)
|
||
(set (make-local-variable 'outline-regexp) diff-outline-regexp)
|
||
(set (make-local-variable 'imenu-generic-expression)
|
||
diff-imenu-generic-expression)
|
||
;; These are not perfect. They would be better done separately for
|
||
;; context diffs and unidiffs.
|
||
;; (set (make-local-variable 'paragraph-start)
|
||
;; (concat "@@ " ; unidiff hunk
|
||
;; "\\|\\*\\*\\* " ; context diff hunk or file start
|
||
;; "\\|--- [^\t]+\t")) ; context or unidiff file
|
||
;; ; start (first or second line)
|
||
;; (set (make-local-variable 'paragraph-separate) paragraph-start)
|
||
;; (set (make-local-variable 'page-delimiter) "--- [^\t]+\t")
|
||
;; compile support
|
||
(set (make-local-variable 'next-error-function) 'diff-next-error)
|
||
|
||
(when (and (> (point-max) (point-min)) diff-default-read-only)
|
||
(toggle-read-only t))
|
||
;; setup change hooks
|
||
(if (not diff-update-on-the-fly)
|
||
(add-hook 'write-contents-functions 'diff-write-contents-hooks nil t)
|
||
(make-local-variable 'diff-unhandled-changes)
|
||
(add-hook 'after-change-functions 'diff-after-change-function nil t)
|
||
(add-hook 'post-command-hook 'diff-post-command-hook nil t))
|
||
;; Neat trick from Dave Love to add more bindings in read-only mode:
|
||
(let ((ro-bind (cons 'buffer-read-only diff-mode-shared-map)))
|
||
(add-to-list 'minor-mode-overriding-map-alist ro-bind)
|
||
;; Turn off this little trick in case the buffer is put in view-mode.
|
||
(add-hook 'view-mode-hook
|
||
`(lambda ()
|
||
(setq minor-mode-overriding-map-alist
|
||
(delq ',ro-bind minor-mode-overriding-map-alist)))
|
||
nil t))
|
||
;; add-log support
|
||
(set (make-local-variable 'add-log-current-defun-function)
|
||
'diff-current-defun)
|
||
(set (make-local-variable 'add-log-buffer-file-name-function)
|
||
'diff-find-file-name))
|
||
|
||
;;;###autoload
|
||
(define-minor-mode diff-minor-mode
|
||
"Minor mode for viewing/editing context diffs.
|
||
\\{diff-minor-mode-map}"
|
||
:group 'diff-mode :lighter " Diff"
|
||
;; FIXME: setup font-lock
|
||
;; setup change hooks
|
||
(if (not diff-update-on-the-fly)
|
||
(add-hook 'write-contents-functions 'diff-write-contents-hooks nil t)
|
||
(make-local-variable 'diff-unhandled-changes)
|
||
(add-hook 'after-change-functions 'diff-after-change-function nil t)
|
||
(add-hook 'post-command-hook 'diff-post-command-hook nil t)))
|
||
|
||
;;; Handy hook functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
||
(defun diff-delete-if-empty ()
|
||
;; An empty diff file means there's no more diffs to integrate, so we
|
||
;; can just remove the file altogether. Very handy for .rej files if we
|
||
;; remove hunks as we apply them.
|
||
(when (and buffer-file-name
|
||
(eq 0 (nth 7 (file-attributes buffer-file-name))))
|
||
(delete-file buffer-file-name)))
|
||
|
||
(defun diff-delete-empty-files ()
|
||
"Arrange for empty diff files to be removed."
|
||
(add-hook 'after-save-hook 'diff-delete-if-empty nil t))
|
||
|
||
(defun diff-make-unified ()
|
||
"Turn context diffs into unified diffs if applicable."
|
||
(if (save-excursion
|
||
(goto-char (point-min))
|
||
(and (looking-at diff-hunk-header-re) (eq (char-after) ?*)))
|
||
(let ((mod (buffer-modified-p)))
|
||
(unwind-protect
|
||
(diff-context->unified (point-min) (point-max))
|
||
(restore-buffer-modified-p mod)))))
|
||
|
||
;;;
|
||
;;; Misc operations that have proved useful at some point.
|
||
;;;
|
||
|
||
(defun diff-next-complex-hunk ()
|
||
"Jump to the next \"complex\" hunk.
|
||
\"Complex\" is approximated by \"the hunk changes the number of lines\".
|
||
Only works for unified diffs."
|
||
(interactive)
|
||
(while
|
||
(and (re-search-forward "^@@ [-0-9]+,\\([0-9]+\\) [+0-9]+,\\([0-9]+\\) @@"
|
||
nil t)
|
||
(equal (match-string 1) (match-string 2)))))
|
||
|
||
(defun diff-hunk-text (hunk destp char-offset)
|
||
"Return the literal source text from HUNK as (TEXT . OFFSET).
|
||
if DESTP is nil TEXT is the source, otherwise the destination text.
|
||
CHAR-OFFSET is a char-offset in HUNK, and OFFSET is the corresponding
|
||
char-offset in TEXT."
|
||
(with-temp-buffer
|
||
(insert hunk)
|
||
(goto-char (point-min))
|
||
(let ((src-pos nil)
|
||
(dst-pos nil)
|
||
(divider-pos nil)
|
||
(num-pfx-chars 2))
|
||
;; Set the following variables:
|
||
;; SRC-POS buffer pos of the source part of the hunk or nil if none
|
||
;; DST-POS buffer pos of the destination part of the hunk or nil
|
||
;; DIVIDER-POS buffer pos of any divider line separating the src & dst
|
||
;; NUM-PFX-CHARS number of line-prefix characters used by this format"
|
||
(cond ((looking-at "^@@")
|
||
;; unified diff
|
||
(setq num-pfx-chars 1)
|
||
(forward-line 1)
|
||
(setq src-pos (point) dst-pos (point)))
|
||
((looking-at "^\\*\\*")
|
||
;; context diff
|
||
(forward-line 2)
|
||
(setq src-pos (point))
|
||
(re-search-forward "^--- " nil t)
|
||
(forward-line 0)
|
||
(setq divider-pos (point))
|
||
(forward-line 1)
|
||
(setq dst-pos (point)))
|
||
((looking-at "^[0-9]+a[0-9,]+$")
|
||
;; normal diff, insert
|
||
(forward-line 1)
|
||
(setq dst-pos (point)))
|
||
((looking-at "^[0-9,]+d[0-9]+$")
|
||
;; normal diff, delete
|
||
(forward-line 1)
|
||
(setq src-pos (point)))
|
||
((looking-at "^[0-9,]+c[0-9,]+$")
|
||
;; normal diff, change
|
||
(forward-line 1)
|
||
(setq src-pos (point))
|
||
(re-search-forward "^---$" nil t)
|
||
(forward-line 0)
|
||
(setq divider-pos (point))
|
||
(forward-line 1)
|
||
(setq dst-pos (point)))
|
||
(t
|
||
(error "Unknown diff hunk type")))
|
||
|
||
(if (if destp (null dst-pos) (null src-pos))
|
||
;; Implied empty text
|
||
(if char-offset '("" . 0) "")
|
||
|
||
;; For context diffs, either side can be empty, (if there's only
|
||
;; added or only removed text). We should then use the other side.
|
||
(cond ((equal src-pos divider-pos) (setq src-pos dst-pos))
|
||
((equal dst-pos (point-max)) (setq dst-pos src-pos)))
|
||
|
||
(when char-offset (goto-char (+ (point-min) char-offset)))
|
||
|
||
;; Get rid of anything except the desired text.
|
||
(save-excursion
|
||
;; Delete unused text region
|
||
(let ((keep (if destp dst-pos src-pos)))
|
||
(when (and divider-pos (> divider-pos keep))
|
||
(delete-region divider-pos (point-max)))
|
||
(delete-region (point-min) keep))
|
||
;; Remove line-prefix characters, and unneeded lines (unified diffs).
|
||
(let ((kill-char (if destp ?- ?+)))
|
||
(goto-char (point-min))
|
||
(while (not (eobp))
|
||
(if (eq (char-after) kill-char)
|
||
(delete-region (point) (progn (forward-line 1) (point)))
|
||
(delete-char num-pfx-chars)
|
||
(forward-line 1)))))
|
||
|
||
(let ((text (buffer-substring-no-properties (point-min) (point-max))))
|
||
(if char-offset (cons text (- (point) (point-min))) text))))))
|
||
|
||
|
||
(defun diff-find-text (text)
|
||
"Return the buffer position (BEG . END) of the nearest occurrence of TEXT.
|
||
If TEXT isn't found, nil is returned."
|
||
(let* ((orig (point))
|
||
(forw (and (search-forward text nil t)
|
||
(cons (match-beginning 0) (match-end 0))))
|
||
(back (and (goto-char (+ orig (length text)))
|
||
(search-backward text nil t)
|
||
(cons (match-beginning 0) (match-end 0)))))
|
||
;; Choose the closest match.
|
||
(if (and forw back)
|
||
(if (> (- (car forw) orig) (- orig (car back))) back forw)
|
||
(or back forw))))
|
||
|
||
(defun diff-find-approx-text (text)
|
||
"Return the buffer position (BEG . END) of the nearest occurrence of TEXT.
|
||
Whitespace differences are ignored."
|
||
(let* ((orig (point))
|
||
(re (concat "^[ \t\n ]*"
|
||
(mapconcat 'regexp-quote (split-string text) "[ \t\n ]+")
|
||
"[ \t\n ]*\n"))
|
||
(forw (and (re-search-forward re nil t)
|
||
(cons (match-beginning 0) (match-end 0))))
|
||
(back (and (goto-char (+ orig (length text)))
|
||
(re-search-backward re nil t)
|
||
(cons (match-beginning 0) (match-end 0)))))
|
||
;; Choose the closest match.
|
||
(if (and forw back)
|
||
(if (> (- (car forw) orig) (- orig (car back))) back forw)
|
||
(or back forw))))
|
||
|
||
(defsubst diff-xor (a b) (if a (not b) b))
|
||
|
||
(defun diff-find-source-location (&optional other-file reverse)
|
||
"Find out (BUF LINE-OFFSET POS SRC DST SWITCHED).
|
||
BUF is the buffer corresponding to the source file.
|
||
LINE-OFFSET is the offset between the expected and actual positions
|
||
of the text of the hunk or nil if the text was not found.
|
||
POS is a pair (BEG . END) indicating the position of the text in the buffer.
|
||
SRC and DST are the two variants of text as returned by `diff-hunk-text'.
|
||
SRC is the variant that was found in the buffer.
|
||
SWITCHED is non-nil if the patch is already applied."
|
||
(save-excursion
|
||
(let* ((other (diff-xor other-file diff-jump-to-old-file))
|
||
(char-offset (- (point) (progn (diff-beginning-of-hunk) (point))))
|
||
(hunk (buffer-substring (point)
|
||
(save-excursion (diff-end-of-hunk) (point))))
|
||
(old (diff-hunk-text hunk reverse char-offset))
|
||
(new (diff-hunk-text hunk (not reverse) char-offset))
|
||
;; Find the location specification.
|
||
(line (if (not (looking-at "\\(?:\\*\\{15\\}.*\n\\)?[-@* ]*\\([0-9,]+\\)\\([ acd+]+\\([0-9,]+\\)\\)?"))
|
||
(error "Can't find the hunk header")
|
||
(if other (match-string 1)
|
||
(if (match-end 3) (match-string 3)
|
||
(unless (re-search-forward "^--- \\([0-9,]+\\)" nil t)
|
||
(error "Can't find the hunk separator"))
|
||
(match-string 1)))))
|
||
(file (or (diff-find-file-name other) (error "Can't find the file")))
|
||
(buf (find-file-noselect file)))
|
||
;; Update the user preference if he so wished.
|
||
(when (> (prefix-numeric-value other-file) 8)
|
||
(setq diff-jump-to-old-file other))
|
||
(with-current-buffer buf
|
||
(goto-line (string-to-number line))
|
||
(let* ((orig-pos (point))
|
||
(switched nil)
|
||
;; FIXME: Check for case where both OLD and NEW are found.
|
||
(pos (or (diff-find-text (car old))
|
||
(progn (setq switched t) (diff-find-text (car new)))
|
||
(progn (setq switched nil)
|
||
(condition-case nil
|
||
(diff-find-approx-text (car old))
|
||
(invalid-regexp nil))) ;Regex too big.
|
||
(progn (setq switched t)
|
||
(condition-case nil
|
||
(diff-find-approx-text (car new))
|
||
(invalid-regexp nil))) ;Regex too big.
|
||
(progn (setq switched nil) nil))))
|
||
(nconc
|
||
(list buf)
|
||
(if pos
|
||
(list (count-lines orig-pos (car pos)) pos)
|
||
(list nil (cons orig-pos (+ orig-pos (length (car old))))))
|
||
(if switched (list new old t) (list old new))))))))
|
||
|
||
|
||
(defun diff-hunk-status-msg (line-offset reversed dry-run)
|
||
(let ((msg (if dry-run
|
||
(if reversed "already applied" "not yet applied")
|
||
(if reversed "undone" "applied"))))
|
||
(message (cond ((null line-offset) "Hunk text not found")
|
||
((= line-offset 0) "Hunk %s")
|
||
((= line-offset 1) "Hunk %s at offset %d line")
|
||
(t "Hunk %s at offset %d lines"))
|
||
msg line-offset)))
|
||
|
||
|
||
(defun diff-apply-hunk (&optional reverse)
|
||
"Apply the current hunk to the source file and go to the next.
|
||
By default, the new source file is patched, but if the variable
|
||
`diff-jump-to-old-file' is non-nil, then the old source file is
|
||
patched instead (some commands, such as `diff-goto-source' can change
|
||
the value of this variable when given an appropriate prefix argument).
|
||
|
||
With a prefix argument, REVERSE the hunk."
|
||
(interactive "P")
|
||
(destructuring-bind (buf line-offset pos old new &optional switched)
|
||
;; If REVERSE go to the new file, otherwise go to the old.
|
||
(diff-find-source-location (not reverse) reverse)
|
||
(cond
|
||
((null line-offset)
|
||
(error "Can't find the text to patch"))
|
||
((and switched
|
||
;; A reversed patch was detected, perhaps apply it in reverse.
|
||
(not (save-window-excursion
|
||
(pop-to-buffer buf)
|
||
(goto-char (+ (car pos) (cdr old)))
|
||
(y-or-n-p
|
||
(if reverse
|
||
"Hunk hasn't been applied yet; apply it now? "
|
||
"Hunk has already been applied; undo it? ")))))
|
||
(message "(Nothing done)"))
|
||
(t
|
||
;; Apply the hunk
|
||
(with-current-buffer buf
|
||
(goto-char (car pos))
|
||
(delete-region (car pos) (cdr pos))
|
||
(insert (car new)))
|
||
;; Display BUF in a window
|
||
(set-window-point (display-buffer buf) (+ (car pos) (cdr new)))
|
||
(diff-hunk-status-msg line-offset (diff-xor switched reverse) nil)
|
||
(when diff-advance-after-apply-hunk
|
||
(diff-hunk-next))))))
|
||
|
||
|
||
(defun diff-test-hunk (&optional reverse)
|
||
"See whether it's possible to apply the current hunk.
|
||
With a prefix argument, try to REVERSE the hunk."
|
||
(interactive "P")
|
||
(destructuring-bind (buf line-offset pos src dst &optional switched)
|
||
;; If REVERSE go to the new file, otherwise go to the old.
|
||
(diff-find-source-location (not reverse) reverse)
|
||
(set-window-point (display-buffer buf) (+ (car pos) (cdr src)))
|
||
(diff-hunk-status-msg line-offset (diff-xor reverse switched) t)))
|
||
|
||
|
||
(defalias 'diff-mouse-goto-source 'diff-goto-source)
|
||
|
||
(defun diff-goto-source (&optional other-file event)
|
||
"Jump to the corresponding source line.
|
||
`diff-jump-to-old-file' (or its opposite if the OTHER-FILE prefix arg
|
||
is given) determines whether to jump to the old or the new file.
|
||
If the prefix arg is bigger than 8 (for example with \\[universal-argument] \\[universal-argument])
|
||
then `diff-jump-to-old-file' is also set, for the next invocations."
|
||
(interactive (list current-prefix-arg last-input-event))
|
||
;; When pointing at a removal line, we probably want to jump to
|
||
;; the old location, and else to the new (i.e. as if reverting).
|
||
;; This is a convenient detail when using smerge-diff.
|
||
(if event (posn-set-point (event-end event)))
|
||
(let ((rev (not (save-excursion (beginning-of-line) (looking-at "[-<]")))))
|
||
(destructuring-bind (buf line-offset pos src dst &optional switched)
|
||
(diff-find-source-location other-file rev)
|
||
(pop-to-buffer buf)
|
||
(goto-char (+ (car pos) (cdr src)))
|
||
(diff-hunk-status-msg line-offset (diff-xor rev switched) t))))
|
||
|
||
|
||
(defun diff-current-defun ()
|
||
"Find the name of function at point.
|
||
For use in `add-log-current-defun-function'."
|
||
(save-excursion
|
||
(when (looking-at diff-hunk-header-re)
|
||
(forward-line 1)
|
||
(re-search-forward "^[^ ]" nil t))
|
||
(destructuring-bind (buf line-offset pos src dst &optional switched)
|
||
(diff-find-source-location)
|
||
(beginning-of-line)
|
||
(or (when (memq (char-after) '(?< ?-))
|
||
;; Cursor is pointing at removed text. This could be a removed
|
||
;; function, in which case, going to the source buffer will
|
||
;; not help since the function is now removed. Instead,
|
||
;; try to figure out the function name just from the code-fragment.
|
||
(let ((old (if switched dst src)))
|
||
(with-temp-buffer
|
||
(insert (car old))
|
||
(funcall (with-current-buffer buf major-mode))
|
||
(goto-char (+ (point-min) (cdr old)))
|
||
(add-log-current-defun))))
|
||
(with-current-buffer buf
|
||
(goto-char (+ (car pos) (cdr src)))
|
||
(add-log-current-defun))))))
|
||
|
||
(defun diff-refine-hunk ()
|
||
"Refine the current hunk by ignoring space differences."
|
||
(interactive)
|
||
(let* ((char-offset (- (point) (progn (diff-beginning-of-hunk) (point))))
|
||
(opts (case (char-after) (?@ "-bu") (?* "-bc") (t "-b")))
|
||
(line-nb (and (or (looking-at "[^0-9]+\\([0-9]+\\)")
|
||
(error "Can't find line number"))
|
||
(string-to-number (match-string 1))))
|
||
(hunk (delete-and-extract-region
|
||
(point) (save-excursion (diff-end-of-hunk) (point))))
|
||
(lead (make-string (1- line-nb) ?\n)) ;Line nums start at 1.
|
||
(file1 (make-temp-file "diff1"))
|
||
(file2 (make-temp-file "diff2"))
|
||
(coding-system-for-read buffer-file-coding-system)
|
||
old new)
|
||
(unwind-protect
|
||
(save-excursion
|
||
(setq old (diff-hunk-text hunk nil char-offset))
|
||
(setq new (diff-hunk-text hunk t char-offset))
|
||
(write-region (concat lead (car old)) nil file1 nil 'nomessage)
|
||
(write-region (concat lead (car new)) nil file2 nil 'nomessage)
|
||
(with-temp-buffer
|
||
(let ((status
|
||
(call-process diff-command nil t nil
|
||
opts file1 file2)))
|
||
(case status
|
||
(0 nil) ;Nothing to reformat.
|
||
(1 (goto-char (point-min))
|
||
;; Remove the file-header.
|
||
(when (re-search-forward diff-hunk-header-re nil t)
|
||
(delete-region (point-min) (match-beginning 0))))
|
||
(t (goto-char (point-max))
|
||
(unless (bolp) (insert "\n"))
|
||
(insert hunk)))
|
||
(setq hunk (buffer-string))
|
||
(unless (memq status '(0 1))
|
||
(error "Diff returned: %s" status)))))
|
||
;; Whatever happens, put back some equivalent text: either the new
|
||
;; one or the original one in case some error happened.
|
||
(insert hunk)
|
||
(delete-file file1)
|
||
(delete-file file2))))
|
||
|
||
;; provide the package
|
||
(provide 'diff-mode)
|
||
|
||
;;; Old Change Log from when diff-mode wasn't part of Emacs:
|
||
;; Revision 1.11 1999/10/09 23:38:29 monnier
|
||
;; (diff-mode-load-hook): dropped.
|
||
;; (auto-mode-alist): also catch *.diffs.
|
||
;; (diff-find-file-name, diff-mode): add smarts to find the right file
|
||
;; for *.rej files (that lack any file name indication).
|
||
;;
|
||
;; Revision 1.10 1999/09/30 15:32:11 monnier
|
||
;; added support for "\ No newline at end of file".
|
||
;;
|
||
;; Revision 1.9 1999/09/15 00:01:13 monnier
|
||
;; - added basic `compile' support.
|
||
;; - have diff-kill-hunk call diff-kill-file if it's the only hunk.
|
||
;; - diff-kill-file now tries to kill the leading garbage as well.
|
||
;;
|
||
;; Revision 1.8 1999/09/13 21:10:09 monnier
|
||
;; - don't use CL in the autoloaded code
|
||
;; - accept diffs using -T
|
||
;;
|
||
;; Revision 1.7 1999/09/05 20:53:03 monnier
|
||
;; interface to ediff-patch
|
||
;;
|
||
;; Revision 1.6 1999/09/01 20:55:13 monnier
|
||
;; (ediff=patch-file): add bindings to call ediff-patch.
|
||
;; (diff-find-file-name): taken out of diff-goto-source.
|
||
;; (diff-unified->context, diff-context->unified, diff-reverse-direction,
|
||
;; diff-fixup-modifs): only use the region if a prefix arg is given.
|
||
;;
|
||
;; Revision 1.5 1999/08/31 19:18:52 monnier
|
||
;; (diff-beginning-of-file, diff-prev-file): fixed wrong parenthesis.
|
||
;;
|
||
;; Revision 1.4 1999/08/31 13:01:44 monnier
|
||
;; use `combine-after-change-calls' to minimize the slowdown of font-lock.
|
||
;;
|
||
|
||
;; arch-tag: 2571d7ff-bc28-4cf9-8585-42e21890be66
|
||
;;; diff-mode.el ends here
|