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michaels  committed 4e8e201

Add diff-mode.
Approved by: Steve Youngs.

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  • Parent commits da297ba

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+2001-04-05  Mike Sperber <mike@xemacs.org>
+
+	* diff-mode.el: 
+	* diff-mode.el.upstream: Added.
+
+	* Makefile (ELCS): Add diff-mode.elc.
+
 2001-03-05  Alex Schroeder  <alex@gnu.org>
 
 	* sql.el (sql-interbase): New function.
 CATEGORY = prog
 
 ELCS = asm-mode.elc autoconf-mode.elc awk-mode.elc cl-indent.elc \
-	cperl-mode.elc cvs.elc eiffel3.elc f90.elc fortran-misc.elc \
-	fortran.elc icon.elc ksh-mode.elc m4-mode.elc make-mode.elc \
+	cperl-mode.elc cvs.elc diff-mode.elc eiffel3.elc \
+	f90.elc fortran-misc.elc fortran.elc \
+	icon.elc ksh-mode.elc m4-mode.elc make-mode.elc \
 	mode-compile.elc modula2.elc pascal.elc perl-mode.elc \
 	postscript.elc prolog.elc python-mode.elc rexx-mode.elc simula.elc \
 	sql.elc tcl.elc teco.elc verilog-mode.elc vrml-mode.elc

File diff-mode.el

+;;; diff-mode.el --- A mode for viewing/editing context diffs
+
+;; Copyright (C) 1998-1999  Stefan Monnier <monnier@cs.yale.edu>
+
+;; Author: Stefan Monnier <monnier@cs.yale.edu>
+;; Keywords: patch diff
+;; Version: v1_8
+;; Revision: diff-mode.el,v 1.11 1999/10/09 23:38:29 monnier Exp
+
+;; This program 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 2 of the License, or
+;; (at your option) any later version.
+;; 
+;; This program 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 this program; if not, write to the Free Software
+;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; Provides support for font-lock patterns, outline-regexps, navigation
+;; commands, editing and various conversions as well as jumping
+;; to the corresponding source file.
+
+;; History:
+
+;; inspired by Pavel Machek's patch-mode.el (<pavel@atrey.karlin.mff.cuni.cz>)
+;; some efforts were spent to have it somewhat compatible with XEmacs'
+;; diff-mode as well as with compilation-minor-mode
+
+;; to use it, simply add to your .emacs the following lines:
+;; 
+;; (autoload 'diff-mode "diff-mode" "Diff major mode" t)
+;; (add-to-list 'auto-mode-alist '("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode))
+
+;; Bugs:
+
+;; - reverse doesn't work with normal diffs.
+;; - (nitpick) the mark is not always quite right in diff-goto-source.
+
+;; Todo:
+
+;; - improve narrowed-view support.
+;; - improve diff-find-file-name.
+;; - improve the `compile' support.
+
+;;; Code:
+
+;; XEmacs change
+(if (featurep 'diff)
+    (error 'invalid-state
+	   "The diff and diff-mode packages are incompatible."))
+
+(eval-when-compile (require 'cl))
+
+
+(defgroup diff-mode ()
+  "Major-mode for viewing/editing diffs"
+  :group 'tools
+  :group 'diff)
+
+(defcustom diff-jump-to-old-file-flag nil
+  "*Non-nil means `diff-goto-source' jumps to the old file.
+Else, it jumps to the new file."
+  :group 'diff-mode
+  :type '(boolean))
+
+(defcustom diff-update-on-the-fly-flag t
+  "*Non-nil means hunk headers are kept up-to-date on-the-fly.
+When editing a diff file, the line numbers in the hunk headers
+need to be kept consistent with the actual diff.  This can
+either be done on the fly (but this sometimes interacts poorly with the
+undo mechanism) or whenever the file is written (can be slow
+when editing big diffs)."
+  :group 'diff-mode
+  :type '(boolean))
+
+(defvar diff-mode-hook nil
+  "Run after setting up the `diff-mode' major mode.")
+
+(defvar diff-outline-regexp
+  "\\([*+][*+][*+] [^0-9]\\|@@ ...\\|\\*\\*\\* [0-9].\\|--- [0-9]..\\)")
+
+;;;; 
+;;;; keymap, menu, ...
+;;;; 
+
+(defmacro diff-defmap (var bindings doc)
+  `(defvar ,var
+     (let ((m (make-keymap)))
+       (dolist (b ,bindings)
+	 (define-key m (car b) (cdr b)))
+       m)
+     ,doc))
+
+(diff-defmap diff-mode-shared-map
+  '(;; from Pavel Machek's patch-mode
+    ("n" . diff-next-hunk)
+    ("N" . diff-next-file)
+    ("p" . diff-prev-hunk)
+    ("P" . diff-prev-file)
+    ("k" . diff-kill-hunk)
+    ("K" . diff-kill-file)
+    ;; from compilation-minor-mode
+    ("}" . diff-next-file)
+    ("{" . diff-prev-file)
+    ("\C-m" . diff-goto-source)
+    ;; from XEmacs' diff-mode
+    ("W" . widen)
+    ;;("." . diff-goto-source)		;display-buffer
+    ;;("f" . diff-goto-source)		;find-file
+    ("o" . diff-goto-source)		;other-window
+    ;;("w" . diff-goto-source)		;other-frame
+    ;;("N" . diff-narrow)
+    ;;("h" . diff-show-header)
+    ;;("j" . diff-show-difference)	;jump to Nth diff
+    ;;("q" . diff-quit)
+    (" " . scroll-up)
+    ("\177" . scroll-down)
+    ;; our very own bindings
+    ("A" . diff-ediff-patch)
+    ("r" . diff-restrict-view)
+    ("R" . diff-reverse-direction)
+    ("U" . diff-context->unified)
+    ("C" . diff-unified->context))
+  "Keymap for read-only `diff-mode'. Only active in read-only mode.")
+
+(diff-defmap diff-mode-map
+  `(("\e" . ,diff-mode-shared-map)
+    ;; from compilation-minor-mode
+    ("\C-c\C-c" . diff-goto-source))
+  "Keymap for `diff-mode'.  See also `diff-mode-shared-map'.")
+
+(easy-menu-define diff-mode-menu diff-mode-map
+  "Menu for `diff-mode'."
+  '("Diff"
+    ["Jump to Source"		diff-goto-source	t]
+    ["Apply with Ediff"		diff-ediff-patch	t]
+    ["-----" nil nil]
+    ["Reverse direction"	diff-reverse-direction	t]
+    ["Context -> Unified"	diff-context->unified	t]
+    ["Unified -> Context"	diff-unified->context	t]
+    ;;["Fixup Headers"		diff-fixup-modifs	(not buffer-read-only)]
+    ))
+
+
+;;;; 
+;;;; font-lock support
+;;;; 
+
+(defface diff-file-header-face
+  '((((class color) (background light))
+     (:background "grey70" :bold t))
+    (t (:bold t)))
+  "diff-mode face used to highlight file header lines."
+  :group 'diff-mode)
+(defvar diff-file-header-face 'diff-file-header-face)
+
+(defface diff-index-face
+  '((((class color) (background light))
+     (:background "grey70" :bold t))
+    (t (:bold t)))
+  "diff-mode face used to highlight index header lines."
+  :group 'diff-mode)
+(defvar diff-index-face 'diff-index-face)
+
+(defface diff-hunk-header-face
+  '((((class color) (background light))
+     (:background "grey85"))
+    (t (:bold t)))
+  "diff-mode face used to highlight hunk header lines."
+  :group 'diff-mode)
+(defvar diff-hunk-header-face 'diff-hunk-header-face)
+
+(defface diff-removed-face
+  '((t ()))
+  "diff-mode face used to highlight removed lines."
+  :group 'diff-mode)
+(defvar diff-removed-face 'diff-removed-face)
+
+(defface diff-added-face
+  '((t ()))
+  "diff-mode face used to highlight added lines."
+  :group 'diff-mode)
+(defvar diff-added-face 'diff-added-face)
+
+(defface diff-changed-face
+  '((t ()))
+  "diff-mode face used to highlight changed lines."
+  :group 'diff-mode)
+(defvar diff-changed-face 'diff-changed-face)
+
+(defvar diff-font-lock-keywords
+  '(("^@@ .+ @@$" . diff-hunk-header-face) ;unified
+    ("^--- .+ ----$" . diff-hunk-header-face) ;context
+    ("^\\*\\*\\*.+\\*\\*\\*\n" . diff-hunk-header-face) ;context
+    ("^\\(---\\|\\+\\+\\+\\|\\*\\*\\*\\) .*\n" . diff-file-header-face)
+    ("^[0-9,]+[acd][0-9,]+$" . diff-hunk-header-face)
+    ("^!.*\n" . diff-changed-face)	;context
+    ("^[+>].*\n" . diff-added-face)
+    ("^[-<].*\n" . diff-removed-face)
+    ("^Index: .*\n" . diff-index-face)
+    ("^[^-=+*!<>].*\n" . font-lock-comment-face)))
+
+(defconst diff-font-lock-defaults
+  '(diff-font-lock-keywords t nil nil nil))
+
+;; XEmacs change
+(eval-when-compile
+  (if (boundp 'combine-after-change-calls)
+      (fset 'diff-mode-combine-after-change-calls 'combine-after-change-calls)
+    (defmacro diff-mode-combine-after-change-calls (&rest body)
+      "Execute `body'."
+      `(progn . ,body))))
+
+;;;;
+;;;; Compile support
+;;;;
+
+(defvar diff-file-regexp-alist
+  '(("Index: \\(.+\\)" 1)))
+
+(defvar diff-error-regexp-alist
+  '(("@@ -\\([0-9]+\\),[0-9]+ \\+\\([0-9]+\\),[0-9]+ @@" nil 2)
+    ("--- \\([0-9]+\\),[0-9]+ ----" nil 1)
+    ("\\([0-9]+\\)\\(,[0-9]+\\)?[adc]\\([0-9]+\\)" nil 3)))
+
+;;;; 
+;;;; Movement
+;;;; 
+
+(defconst diff-hunk-header-re "^\\(@@ .+ @@\\|\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\n\\*\\*\\* .+ \\*\\*\\*\\*\\|[0-9]+\\(,[0-9]+\\)?[acd][0-9]+\\(,[0-9]+\\)?\\)$")
+(defconst diff-file-header-re (concat "^\\(--- .+\n\\+\\+\\+\\|\\*\\*\\* .+\n---\\|[^-+!<>0-9@* ]\\).+\n" (substring diff-hunk-header-re 1)))
+(defvar diff-narrowed-to nil)
+
+(defun diff-end-of-hunk (&optional style)
+  (if (looking-at diff-hunk-header-re) (goto-char (match-end 0)))
+  (re-search-forward (case style
+		       (unified "^[^-+ \\]")
+		       (context "^\\([^-+! \\][ \t]\\|--- .+ ----\\)")
+		       (normal "^\\([<>\\][ \t]\\|---\\)")
+		       (t "^[^-+!<> \\]"))
+		     nil 'move)
+  (beginning-of-line))
+
+(defun diff-beginning-of-hunk ()
+  (beginning-of-line)
+  (unless (looking-at diff-hunk-header-re)
+    (forward-line 1)
+    (condition-case ()
+	(re-search-backward diff-hunk-header-re)
+      (error (error "Can't find the beginning of the hunk")))))
+
+(defun diff-beginning-of-file ()
+  (beginning-of-line)
+  (unless (looking-at diff-file-header-re)
+    (forward-line 2)
+    (condition-case ()
+	(re-search-backward diff-file-header-re)
+      (error (error "Can't find the beginning of the file")))))
+
+(defun diff-end-of-file ()
+  (re-search-forward "^[-+!<>0-9@* \\]" nil t)
+  (re-search-forward "^[^-+!<>0-9@* \\]" nil 'move)
+  (beginning-of-line))
+
+(defun diff-next-hunk (&optional count)
+  "Move to next (COUNT'th) hunk."
+  (interactive "p")
+  (unless count (setq count 1))
+  (if (< count 0) (diff-prev-hunk (- count))
+    (when (looking-at diff-hunk-header-re) (incf count))
+    (condition-case ()
+	(re-search-forward diff-hunk-header-re nil nil count)
+      (error (error "Can't find next hunk")))
+    (goto-char (match-beginning 0))))
+
+(defun diff-prev-hunk (&optional count)
+  "Move to previous (COUNT'th) hunk."
+  (interactive "p")
+  (unless count (setq count 1))
+  (if (< count 0) (diff-next-hunk (- count))
+    (condition-case ()
+	(re-search-backward diff-hunk-header-re nil nil count)
+      (error (error "Can't find previous hunk")))))
+
+(defun diff-next-file (&optional count)
+  "Move to next (COUNT'th) file header."
+  (interactive "p")
+  (unless count (setq count 1))
+  (if (< count 0) (diff-prev-file (- count))
+    (when (looking-at diff-file-header-re) (incf count))
+    (condition-case ()
+	(re-search-forward diff-file-header-re nil nil count)
+      (error (error "Can't find next file")))
+    (goto-char (match-beginning 0))))
+
+(defun diff-prev-file (&optional count)
+  "Move to (COUNT'th) previous file header."
+  (interactive "p")
+  (unless count (setq count 1))
+  (if (< count 0) (diff-next-file (- count))
+    (condition-case ()
+	(re-search-backward diff-file-header-re nil nil count)
+      (error (error "Can't find previous file")))))
+
+(defun diff-restrict-view (&optional arg)
+  "Restrict the view to the current hunk.
+If the prefix ARG is given, restrict the view to the current file instead."
+  (interactive "P")
+  (save-excursion
+    (if arg (diff-beginning-of-file) (diff-beginning-of-hunk))
+    (narrow-to-region (point)
+		      (progn (if arg (diff-end-of-file) (diff-end-of-hunk))
+			     (point)))
+    (set (make-local-variable 'diff-narrowed-to) (if arg 'file 'hunk))))
+
+
+(defun diff-kill-hunk ()
+  "Kill current hunk."
+  (interactive)
+  (diff-beginning-of-hunk)
+  (let ((start (point))
+	(firsthunk (save-excursion
+		     (ignore-errors
+		       (diff-beginning-of-file) (diff-next-hunk) (point))))
+	(nexthunk  (save-excursion
+		     (ignore-errors
+		       (diff-next-hunk) (point))))
+	(nextfile (save-excursion
+		    (ignore-errors
+		      (diff-next-file) (point)))))
+    (if (and firsthunk (= firsthunk start)
+	     (or (null nexthunk)
+		 (and nextfile (> nexthunk nextfile))))
+	;; we're the only hunk for this file, so kill the file
+	(diff-kill-file)
+      (diff-end-of-hunk)
+      (kill-region start (point)))))
+
+(defun diff-kill-file ()
+  "Kill current file's hunks."
+  (interactive)
+  (diff-beginning-of-file)
+  (let* ((start (point))
+	 (prevhunk (save-excursion
+		     (ignore-errors
+		       (diff-prev-hunk) (point))))
+	 (index (save-excursion
+		  (re-search-backward "^Index: " prevhunk t))))
+    (when index (setq start index))
+    (diff-end-of-file)
+    (kill-region start (point))))
+
+;;;;
+;;;; jump to other buffers
+;;;;
+
+(defun diff-filename-drop-dir (file)
+  (when (string-match "/" file) (substring file (match-end 0))))
+
+(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* ((limit (save-excursion
+		   (condition-case ()
+		       (progn (diff-prev-hunk) (point))
+		     (error (point-min)))))
+	   (fs (append
+		(when (looking-at "[-*][-*][-*] \\(\\S-+\\)\\s-.*\n[-+][-+][-+] \\(\\S-+\\)\\s-.*$")
+		  (list (if old (match-string 1) (match-string 2))
+			(if old (match-string 2) (match-string 1))))
+		(progn (forward-line 1) nil)
+		(when (save-excursion
+			(re-search-backward "^Index: \\(.+\\)" limit t))
+		  (list (match-string 1)))
+		(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))))))
+	   (fs (delq nil fs))
+	   (file
+	    ;; 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))))
+      (or
+       file
+       (and (string-match "\\.rej\\'" (or buffer-file-name ""))
+	    (let ((file (substring buffer-file-name 0 (match-beginning 0))))
+	      (when (file-exists-p file) file)))
+       ;; FIXME: use a more informative prompt
+       (let ((file (read-file-name "File: " nil (first fs) nil (first fs))))
+	 ;; FIXME: remember for the next invocation
+	 file)))))
+
+(defun diff-goto-source (&optional other-file)
+  "Jump to the corresponding source line.
+`diff-jump-to-old-file-flag' (or its opposite if the OTHER-FILE prefix arg
+is give) 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-flag' is also set, for the next invokations."
+  (interactive "P")
+  (save-excursion
+    (let ((old (if (not other-file) diff-jump-to-old-file-flag
+		 (not diff-jump-to-old-file-flag))))
+      (when (> (prefix-numeric-value other-file) 8)
+	(setq diff-jump-to-old-file-flag old))
+      (diff-beginning-of-hunk)
+      (let* ((loc (if (not (looking-at "[-@*\n ]*\\([0-9,]+\\)\\([ acd+]+\\([0-9,]+\\)\\)?"))
+		      (error "Can't find the hunk header")
+		    (if old (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)))))
+	     (lines (if (string-match "^\\([0-9]*\\),\\([0-9]*\\)" loc)
+			(cons (string-to-number (match-string 1 loc))
+			      (string-to-number (match-string 2 loc)))
+		      (cons (string-to-number loc) nil)))
+	     (file (diff-find-file-name old)))
+	(unless file (error "Can't find the file"))
+	(pop-to-buffer (find-file-noselect file))
+	(let* ((line (car lines))
+	       (span (if (or (null (cdr lines)) (< (cdr lines) 0)) 0
+		       (if (< (cdr lines) line) (cdr lines)
+			 (- (cdr lines) line)))))
+	  (ignore-errors
+	    (goto-line line)
+	    (forward-line span)
+	    (push-mark (point) t t)
+	    (goto-line line)))))))
+
+
+(defun diff-ediff-patch ()
+  "Call `ediff-patch-file' on the current buffer."
+  (interactive)
+  (condition-case err
+      (ediff-patch-file (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))
+	(diff-mode-combine-after-change-calls
+	 (if (match-beginning 2)
+	     ;;we matched a file header
+	     ;; XEmacs change: don't use `replace-match'
+	     ;; which has a different API there.
+	     (save-excursion
+	       ;; use reverse order to make sure the indices are kept valid
+	       (delete-region (match-beginning 3) (match-end 3))
+	       (goto-char (match-beginning 3))
+	       (insert-string "---")
+	       (delete-region (match-beginning 2) (match-end 2))
+	       (goto-char (match-beginning 2))
+	       (insert-string "***"))
+	   ;; 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\\(---\\) .+\\|\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\n\\*\\*\\* \\([0-9]+\\),\\(-?[0-9]+\\) \\*\\*\\*\\*\\)$" nil t)
+		  (< (point) end))
+	(diff-mode-combine-after-change-calls
+	  (if (match-beginning 2)
+	      ;; we matched a file header
+	     ;; XEmacs change: don't use `replace-match'
+	      ;; which has a different API there.
+	      (save-excursion
+	       ;; use reverse order to make sure the indices are kept valid
+		(delete-region (match-beginning 3) (match-end 3))
+		(goto-char (match-beginning 3))
+		(insert-string "+++")
+		(delete-region (match-beginning 2) (match-end 2))
+		(goto-char (match-beginning 2))
+		(insert-string "---"))
+	    ;; we matched a hunk header
+	    (let ((line1s (match-string 4))
+		  (line1e (match-string 5))
+		  (pt1 (match-beginning 0)))
+	      (replace-match "")
+	      (unless (re-search-forward
+		       "^--- \\([0-9]+\\),\\(-?[0-9]+\\) ----$" 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\\([-+][-+][-+] \\)\\(.+\\)\\|\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\n\\*\\*\\* \\(.+\\) \\*\\*\\*\\*\\|@@ -\\(.+\\) \\+\\(.+\\) @@\\)$" nil t)
+		  (< (point) end))
+	(diff-mode-combine-after-change-calls
+	  (cond
+	   ;; a file header
+	   ((match-beginning 2) (replace-match "\\2\\5\n\\4\\3" nil))
+	   ;; a context-diff hunk header
+	   ((match-beginning 6)
+	    (let ((pt-lines1 (match-beginning 6))
+		  (lines1 (match-string 6)))
+	      (replace-match "" nil nil nil 6)
+	      (forward-line 1)
+	      (let ((half1s (point)))
+		(while (looking-at "[-! \\][ \t]")
+		  (when (= (char-after) ?-) (delete-char 1) (insert "+"))
+		  (forward-line 1))
+		(let ((half1 (buffer-substring half1s (point))))
+		  (delete-region half1s (point))
+		  (unless (looking-at "^--- \\([0-9]+,-?[0-9]+\\) ----$")
+		    (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 (buffer-substring half2s (point))))
+			(delete-region half2s (point))
+			(insert half1)
+			(goto-char half1s)
+			(insert 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))
+			    (let ((str (buffer-substring first last)))
+			      (save-excursion (delete-region first last))
+			      (insert str)))
+			  (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 "\\(@@ .+ @@\\|[-*][-*][-*] .+ [-*][-*][-*][-*]\\)$"))
+	      (case (char-after)
+		(?\  (incf space))
+		(?+ (incf plus))
+		(?- (incf minus))
+		(?! (incf bang))
+		(?\\ nil)
+		(t  (setq space 0 plus 0 minus 0 bang 0)))
+	    (cond
+	     ((looking-at "@@ -[0-9]+,\\([0-9]*\\) \\+[0-9]+,\\([0-9]*\\) @@$")
+	      (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)
+
+;; XEmacs doesn't seem to have this feature
+(defvar undo-in-progress 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."
+  (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 beg (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)) (diff-beginning-of-hunk)
+	(diff-fixup-modifs (point) (cdr diff-unhandled-changes))))
+    (setq diff-unhandled-changes nil)))
+
+;;;###autoload
+(defadvice vc-backend-diff (around diff-mode-vc activate)
+  ;; BEWARE!! when this is autoloaded, CL might not be available
+  (condition-case ()
+      (with-current-buffer "*vc-diff*" (setq buffer-read-only nil))
+    (error nil))
+  ad-do-it
+  (condition-case ()
+      (with-current-buffer "*vc-diff*"
+	(if (memq major-mode '(fundamental-mode diff-mode)) (diff-mode)))
+    (error nil)))
+
+
+;;;; 
+;;;; The main function
+;;;; 
+
+;;(autoload 'diff-mode "diff-mode" "Major mode for viewing context diffs." t)
+;;;###autoload
+(defun diff-mode ()
+  "Major mode for viewing 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.
+This mode runs `diff-mode-hook'.
+\\{diff-mode-map}"
+  (interactive)
+  (kill-all-local-variables)
+  (setq major-mode 'diff-mode)
+  (setq mode-name "Diff")
+  (use-local-map diff-mode-map)
+  (set (make-local-variable 'font-lock-defaults) diff-font-lock-defaults)
+  (set (make-local-variable 'outline-regexp) diff-outline-regexp)
+  ;; compile support
+  (set (make-local-variable 'compilation-file-regexp-alist)
+       diff-file-regexp-alist)
+  (set (make-local-variable 'compilation-error-regexp-alist)
+       diff-error-regexp-alist)
+  (when (string-match "\\.rej\\'" (or buffer-file-name ""))
+    (set (make-local-variable 'compilation-current-file)
+	 (substring buffer-file-name 0 (match-beginning 0))))
+  (compilation-shell-minor-mode 1)
+  ;; 
+  (setq buffer-read-only t)
+  (if (not diff-update-on-the-fly-flag)
+      (add-hook 'write-contents-hooks 'diff-write-contents-hooks)
+    (make-local-variable 'diff-unhandled-changes)
+    (make-local-hook 'after-change-functions)
+    (add-hook 'after-change-functions 'diff-after-change-function nil t)
+    (make-local-hook 'post-command-hook)
+    (add-hook 'post-command-hook 'diff-post-command-hook nil t))
+  ;; Neat trick from Dave Love to add more bindings in read-only mode:
+  (add-to-list (make-local-variable 'minor-mode-map-alist)
+	       (cons 'buffer-read-only diff-mode-shared-map))
+  ;;
+  (run-hooks 'diff-mode-hook))
+
+;;;###autoload
+(add-to-list 'auto-mode-alist '("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode))
+
+;; provide the package
+(provide 'diff-mode)
+
+;;; Change Log:
+;; diff-mode.el,v
+;; 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.
+;;
+
+;;; diff-mode.el ends here

File diff-mode.el.upstream

+;;; diff-mode.el --- A mode for viewing/editing context diffs
+
+;; Copyright (C) 1998-1999  Stefan Monnier <monnier@cs.yale.edu>
+
+;; Author: Stefan Monnier <monnier@cs.yale.edu>
+;; Keywords: patch diff
+;; Version: v1_8
+;; Revision: diff-mode.el,v 1.11 1999/10/09 23:38:29 monnier Exp
+
+;; This program 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 2 of the License, or
+;; (at your option) any later version.
+;; 
+;; This program 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 this program; if not, write to the Free Software
+;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; Provides support for font-lock patterns, outline-regexps, navigation
+;; commands, editing and various conversions as well as jumping
+;; to the corresponding source file.
+
+;; History:
+
+;; inspired by Pavel Machek's patch-mode.el (<pavel@atrey.karlin.mff.cuni.cz>)
+;; some efforts were spent to have it somewhat compatible with XEmacs'
+;; diff-mode as well as with compilation-minor-mode
+
+;; to use it, simply add to your .emacs the following lines:
+;; 
+;; (autoload 'diff-mode "diff-mode" "Diff major mode" t)
+;; (add-to-list 'auto-mode-alist '("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode))
+
+;; Bugs:
+
+;; - reverse doesn't work with normal diffs.
+;; - (nitpick) the mark is not always quite right in diff-goto-source.
+
+;; Todo:
+
+;; - improve narrowed-view support.
+;; - improve diff-find-file-name.
+;; - improve the `compile' support.
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
+
+
+(defgroup diff-mode ()
+  "Major-mode for viewing/editing diffs"
+  :group 'tools
+  :group 'diff)
+
+(defcustom diff-jump-to-old-file-flag nil
+  "*Non-nil means `diff-goto-source' jumps to the old file.
+Else, it jumps to the new file."
+  :group 'diff-mode
+  :type '(boolean))
+
+(defcustom diff-update-on-the-fly-flag t
+  "*Non-nil means hunk headers are kept up-to-date on-the-fly.
+When editing a diff file, the line numbers in the hunk headers
+need to be kept consistent with the actual diff.  This can
+either be done on the fly (but this sometimes interacts poorly with the
+undo mechanism) or whenever the file is written (can be slow
+when editing big diffs)."
+  :group 'diff-mode
+  :type '(boolean))
+
+(defvar diff-mode-hook nil
+  "Run after setting up the `diff-mode' major mode.")
+
+(defvar diff-outline-regexp
+  "\\([*+][*+][*+] [^0-9]\\|@@ ...\\|\\*\\*\\* [0-9].\\|--- [0-9]..\\)")
+
+;;;; 
+;;;; keymap, menu, ...
+;;;; 
+
+(defmacro diff-defmap (var bindings doc)
+  `(defvar ,var
+     (let ((m (make-keymap)))
+       (dolist (b ,bindings)
+	 (define-key m (car b) (cdr b)))
+       m)
+     ,doc))
+
+(diff-defmap diff-mode-shared-map
+  '(;; from Pavel Machek's patch-mode
+    ("n" . diff-next-hunk)
+    ("N" . diff-next-file)
+    ("p" . diff-prev-hunk)
+    ("P" . diff-prev-file)
+    ("k" . diff-kill-hunk)
+    ("K" . diff-kill-file)
+    ;; from compilation-minor-mode
+    ("}" . diff-next-file)
+    ("{" . diff-prev-file)
+    ("\C-m" . diff-goto-source)
+    ;; from XEmacs' diff-mode
+    ("W" . widen)
+    ;;("." . diff-goto-source)		;display-buffer
+    ;;("f" . diff-goto-source)		;find-file
+    ("o" . diff-goto-source)		;other-window
+    ;;("w" . diff-goto-source)		;other-frame
+    ;;("N" . diff-narrow)
+    ;;("h" . diff-show-header)
+    ;;("j" . diff-show-difference)	;jump to Nth diff
+    ;;("q" . diff-quit)
+    (" " . scroll-up)
+    ("\177" . scroll-down)
+    ;; our very own bindings
+    ("A" . diff-ediff-patch)
+    ("r" . diff-restrict-view)
+    ("R" . diff-reverse-direction)
+    ("U" . diff-context->unified)
+    ("C" . diff-unified->context))
+  "Keymap for read-only `diff-mode'. Only active in read-only mode.")
+
+(diff-defmap diff-mode-map
+  `(("\e" . ,diff-mode-shared-map)
+    ;; from compilation-minor-mode
+    ("\C-c\C-c" . diff-goto-source))
+  "Keymap for `diff-mode'.  See also `diff-mode-shared-map'.")
+
+(easy-menu-define diff-mode-menu diff-mode-map
+  "Menu for `diff-mode'."
+  '("Diff"
+    ["Jump to Source"		diff-goto-source	t]
+    ["Apply with Ediff"		diff-ediff-patch	t]
+    ["-----" nil nil]
+    ["Reverse direction"	diff-reverse-direction	t]
+    ["Context -> Unified"	diff-context->unified	t]
+    ["Unified -> Context"	diff-unified->context	t]
+    ;;["Fixup Headers"		diff-fixup-modifs	(not buffer-read-only)]
+    ))
+
+
+;;;; 
+;;;; font-lock support
+;;;; 
+
+(defface diff-file-header-face
+  '((((class color) (background light))
+     (:background "grey70" :bold t))
+    (t (:bold t)))
+  "diff-mode face used to highlight file header lines."
+  :group 'diff-mode)
+(defvar diff-file-header-face 'diff-file-header-face)
+
+(defface diff-index-face
+  '((((class color) (background light))
+     (:background "grey70" :bold t))
+    (t (:bold t)))
+  "diff-mode face used to highlight index header lines."
+  :group 'diff-mode)
+(defvar diff-index-face 'diff-index-face)
+
+(defface diff-hunk-header-face
+  '((((class color) (background light))
+     (:background "grey85"))
+    (t (:bold t)))
+  "diff-mode face used to highlight hunk header lines."
+  :group 'diff-mode)
+(defvar diff-hunk-header-face 'diff-hunk-header-face)
+
+(defface diff-removed-face
+  '((t ()))
+  "diff-mode face used to highlight removed lines."
+  :group 'diff-mode)
+(defvar diff-removed-face 'diff-removed-face)
+
+(defface diff-added-face
+  '((t ()))
+  "diff-mode face used to highlight added lines."
+  :group 'diff-mode)
+(defvar diff-added-face 'diff-added-face)
+
+(defface diff-changed-face
+  '((t ()))
+  "diff-mode face used to highlight changed lines."
+  :group 'diff-mode)
+(defvar diff-changed-face 'diff-changed-face)
+
+(defvar diff-font-lock-keywords
+  '(("^@@ .+ @@$" . diff-hunk-header-face) ;unified
+    ("^--- .+ ----$" . diff-hunk-header-face) ;context
+    ("^\\*\\*\\*.+\\*\\*\\*\n" . diff-hunk-header-face) ;context
+    ("^\\(---\\|\\+\\+\\+\\|\\*\\*\\*\\) .*\n" . diff-file-header-face)
+    ("^[0-9,]+[acd][0-9,]+$" . diff-hunk-header-face)
+    ("^!.*\n" . diff-changed-face)	;context
+    ("^[+>].*\n" . diff-added-face)
+    ("^[-<].*\n" . diff-removed-face)
+    ("^Index: .*\n" . diff-index-face)
+    ("^[^-=+*!<>].*\n" . font-lock-comment-face)))
+
+(defconst diff-font-lock-defaults
+  '(diff-font-lock-keywords t nil nil nil))
+
+;;;;
+;;;; Compile support
+;;;;
+
+(defvar diff-file-regexp-alist
+  '(("Index: \\(.+\\)" 1)))
+
+(defvar diff-error-regexp-alist
+  '(("@@ -\\([0-9]+\\),[0-9]+ \\+\\([0-9]+\\),[0-9]+ @@" nil 2)
+    ("--- \\([0-9]+\\),[0-9]+ ----" nil 1)
+    ("\\([0-9]+\\)\\(,[0-9]+\\)?[adc]\\([0-9]+\\)" nil 3)))
+
+;;;; 
+;;;; Movement
+;;;; 
+
+(defconst diff-hunk-header-re "^\\(@@ .+ @@\\|\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\n\\*\\*\\* .+ \\*\\*\\*\\*\\|[0-9]+\\(,[0-9]+\\)?[acd][0-9]+\\(,[0-9]+\\)?\\)$")
+(defconst diff-file-header-re (concat "^\\(--- .+\n\\+\\+\\+\\|\\*\\*\\* .+\n---\\|[^-+!<>0-9@* ]\\).+\n" (substring diff-hunk-header-re 1)))
+(defvar diff-narrowed-to nil)
+
+(defun diff-end-of-hunk (&optional style)
+  (if (looking-at diff-hunk-header-re) (goto-char (match-end 0)))
+  (re-search-forward (case style
+		       (unified "^[^-+ \\]")
+		       (context "^\\([^-+! \\][ \t]\\|--- .+ ----\\)")
+		       (normal "^\\([<>\\][ \t]\\|---\\)")
+		       (t "^[^-+!<> \\]"))
+		     nil 'move)
+  (beginning-of-line))
+
+(defun diff-beginning-of-hunk ()
+  (beginning-of-line)
+  (unless (looking-at diff-hunk-header-re)
+    (forward-line 1)
+    (condition-case ()
+	(re-search-backward diff-hunk-header-re)
+      (error (error "Can't find the beginning of the hunk")))))
+
+(defun diff-beginning-of-file ()
+  (beginning-of-line)
+  (unless (looking-at diff-file-header-re)
+    (forward-line 2)
+    (condition-case ()
+	(re-search-backward diff-file-header-re)
+      (error (error "Can't find the beginning of the file")))))
+
+(defun diff-end-of-file ()
+  (re-search-forward "^[-+!<>0-9@* \\]" nil t)
+  (re-search-forward "^[^-+!<>0-9@* \\]" nil 'move)
+  (beginning-of-line))
+
+(defun diff-next-hunk (&optional count)
+  "Move to next (COUNT'th) hunk."
+  (interactive "p")
+  (unless count (setq count 1))
+  (if (< count 0) (diff-prev-hunk (- count))
+    (when (looking-at diff-hunk-header-re) (incf count))
+    (condition-case ()
+	(re-search-forward diff-hunk-header-re nil nil count)
+      (error (error "Can't find next hunk")))
+    (goto-char (match-beginning 0))))
+
+(defun diff-prev-hunk (&optional count)
+  "Move to previous (COUNT'th) hunk."
+  (interactive "p")
+  (unless count (setq count 1))
+  (if (< count 0) (diff-next-hunk (- count))
+    (condition-case ()
+	(re-search-backward diff-hunk-header-re nil nil count)
+      (error (error "Can't find previous hunk")))))
+
+(defun diff-next-file (&optional count)
+  "Move to next (COUNT'th) file header."
+  (interactive "p")
+  (unless count (setq count 1))
+  (if (< count 0) (diff-prev-file (- count))
+    (when (looking-at diff-file-header-re) (incf count))
+    (condition-case ()
+	(re-search-forward diff-file-header-re nil nil count)
+      (error (error "Can't find next file")))
+    (goto-char (match-beginning 0))))
+
+(defun diff-prev-file (&optional count)
+  "Move to (COUNT'th) previous file header."
+  (interactive "p")
+  (unless count (setq count 1))
+  (if (< count 0) (diff-next-file (- count))
+    (condition-case ()
+	(re-search-backward diff-file-header-re nil nil count)
+      (error (error "Can't find previous file")))))
+
+(defun diff-restrict-view (&optional arg)
+  "Restrict the view to the current hunk.
+If the prefix ARG is given, restrict the view to the current file instead."
+  (interactive "P")
+  (save-excursion
+    (if arg (diff-beginning-of-file) (diff-beginning-of-hunk))
+    (narrow-to-region (point)
+		      (progn (if arg (diff-end-of-file) (diff-end-of-hunk))
+			     (point)))
+    (set (make-local-variable 'diff-narrowed-to) (if arg 'file 'hunk))))
+
+
+(defun diff-kill-hunk ()
+  "Kill current hunk."
+  (interactive)
+  (diff-beginning-of-hunk)
+  (let ((start (point))
+	(firsthunk (save-excursion
+		     (ignore-errors
+		       (diff-beginning-of-file) (diff-next-hunk) (point))))
+	(nexthunk  (save-excursion
+		     (ignore-errors
+		       (diff-next-hunk) (point))))
+	(nextfile (save-excursion
+		    (ignore-errors
+		      (diff-next-file) (point)))))
+    (if (and firsthunk (= firsthunk start)
+	     (or (null nexthunk)
+		 (and nextfile (> nexthunk nextfile))))
+	;; we're the only hunk for this file, so kill the file
+	(diff-kill-file)
+      (diff-end-of-hunk)
+      (kill-region start (point)))))
+
+(defun diff-kill-file ()
+  "Kill current file's hunks."
+  (interactive)
+  (diff-beginning-of-file)
+  (let* ((start (point))
+	 (prevhunk (save-excursion
+		     (ignore-errors
+		       (diff-prev-hunk) (point))))
+	 (index (save-excursion
+		  (re-search-backward "^Index: " prevhunk t))))
+    (when index (setq start index))
+    (diff-end-of-file)
+    (kill-region start (point))))
+
+;;;;
+;;;; jump to other buffers
+;;;;
+
+(defun diff-filename-drop-dir (file)
+  (when (string-match "/" file) (substring file (match-end 0))))
+
+(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* ((limit (save-excursion
+		   (condition-case ()
+		       (progn (diff-prev-hunk) (point))
+		     (error (point-min)))))
+	   (fs (append
+		(when (looking-at "[-*][-*][-*] \\(\\S-+\\)\\s-.*\n[-+][-+][-+] \\(\\S-+\\)\\s-.*$")
+		  (list (if old (match-string 1) (match-string 2))
+			(if old (match-string 2) (match-string 1))))
+		(progn (forward-line 1) nil)
+		(when (save-excursion
+			(re-search-backward "^Index: \\(.+\\)" limit t))
+		  (list (match-string 1)))
+		(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))))))
+	   (fs (delq nil fs))
+	   (file
+	    ;; 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))))
+      (or
+       file
+       (and (string-match "\\.rej\\'" (or buffer-file-name ""))
+	    (let ((file (substring buffer-file-name 0 (match-beginning 0))))
+	      (when (file-exists-p file) file)))
+       ;; FIXME: use a more informative prompt
+       (let ((file (read-file-name "File: " nil (first fs) nil (first fs))))
+	 ;; FIXME: remember for the next invocation
+	 file)))))
+
+(defun diff-goto-source (&optional other-file)
+  "Jump to the corresponding source line.
+`diff-jump-to-old-file-flag' (or its opposite if the OTHER-FILE prefix arg
+is give) 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-flag' is also set, for the next invokations."
+  (interactive "P")
+  (save-excursion
+    (let ((old (if (not other-file) diff-jump-to-old-file-flag
+		 (not diff-jump-to-old-file-flag))))
+      (when (> (prefix-numeric-value other-file) 8)
+	(setq diff-jump-to-old-file-flag old))
+      (diff-beginning-of-hunk)
+      (let* ((loc (if (not (looking-at "[-@*\n ]*\\([0-9,]+\\)\\([ acd+]+\\([0-9,]+\\)\\)?"))
+		      (error "Can't find the hunk header")
+		    (if old (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)))))
+	     (lines (if (string-match "^\\([0-9]*\\),\\([0-9]*\\)" loc)
+			(cons (string-to-number (match-string 1 loc))
+			      (string-to-number (match-string 2 loc)))
+		      (cons (string-to-number loc) nil)))
+	     (file (diff-find-file-name old)))
+	(unless file (error "Can't find the file"))
+	(pop-to-buffer (find-file-noselect file))
+	(let* ((line (car lines))
+	       (span (if (or (null (cdr lines)) (< (cdr lines) 0)) 0
+		       (if (< (cdr lines) line) (cdr lines)
+			 (- (cdr lines) line)))))
+	  (ignore-errors
+	    (goto-line line)
+	    (forward-line span)
+	    (push-mark (point) t t)
+	    (goto-line line)))))))
+
+
+(defun diff-ediff-patch ()
+  "Call `ediff-patch-file' on the current buffer."
+  (interactive)
+  (condition-case err
+      (ediff-patch-file (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\\(---\\) .+\\|\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\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\\([-+][-+][-+] \\)\\(.+\\)\\|\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\\*\n\\*\\*\\* \\(.+\\) \\*\\*\\*\\*\\|@@ -\\(.+\\) \\+\\(.+\\) @@\\)$" nil t)
+		  (< (point) end))
+	(combine-after-change-calls
+	  (cond
+	   ;; a file header
+	   ((match-beginning 2) (replace-match "\\2\\5\n\\4\\3" nil))
+	   ;; a context-diff hunk header
+	   ((match-beginning 6)
+	    (let ((pt-lines1 (match-beginning 6))
+		  (lines1 (match-string 6)))
+	      (replace-match "" nil nil nil 6)
+	      (forward-line 1)
+	      (let ((half1s (point)))
+		(while (looking-at "[-! \\][ \t]")
+		  (when (= (char-after) ?-) (delete-char 1) (insert "+"))
+		  (forward-line 1))
+		(let ((half1 (buffer-substring half1s (point))))
+		  (delete-region half1s (point))
+		  (unless (looking-at "^--- \\([0-9]+,-?[0-9]+\\) ----$")
+		    (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 (buffer-substring half2s (point))))
+			(delete-region half2s (point))
+			(insert half1)
+			(goto-char half1s)
+			(insert 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))
+			    (let ((str (buffer-substring first last)))
+			      (save-excursion (delete-region first last))
+			      (insert str)))
+			  (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 "\\(@@ .+ @@\\|[-*][-*][-*] .+ [-*][-*][-*][-*]\\)$"))
+	      (case (char-after)
+		(?\  (incf space))
+		(?+ (incf plus))
+		(?- (incf minus))
+		(?! (incf bang))
+		(?\\ nil)
+		(t  (setq space 0 plus 0 minus 0 bang 0)))
+	    (cond
+	     ((looking-at "@@ -[0-9]+,\\([0-9]*\\) \\+[0-9]+,\\([0-9]*\\) @@$")
+	      (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)
+
+;; XEmacs doesn't seem to have this feature
+(defvar undo-in-progress 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."
+  (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 beg (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)) (diff-beginning-of-hunk)
+	(diff-fixup-modifs (point) (cdr diff-unhandled-changes))))
+    (setq diff-unhandled-changes nil)))
+
+;;;###autoload
+(defadvice vc-backend-diff (around diff-mode-vc activate)
+  ;; BEWARE!! when this is autoloaded, CL might not be available
+  (condition-case ()
+      (with-current-buffer "*vc-diff*" (setq buffer-read-only nil))
+    (error nil))
+  ad-do-it
+  (condition-case ()
+      (with-current-buffer "*vc-diff*"
+	(if (memq major-mode '(fundamental-mode diff-mode)) (diff-mode)))
+    (error nil)))
+
+
+;;;; 
+;;;; The main function
+;;;; 
+
+;;(autoload 'diff-mode "diff-mode" "Major mode for viewing context diffs." t)
+;;;###autoload
+(defun diff-mode ()
+  "Major mode for viewing 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.
+This mode runs `diff-mode-hook'.
+\\{diff-mode-map}"
+  (interactive)
+  (kill-all-local-variables)
+  (setq major-mode 'diff-mode)
+  (setq mode-name "Diff")
+  (use-local-map diff-mode-map)
+  (set (make-local-variable 'font-lock-defaults) diff-font-lock-defaults)
+  (set (make-local-variable 'outline-regexp) diff-outline-regexp)
+  ;; compile support
+  (set (make-local-variable 'compilation-file-regexp-alist)
+       diff-file-regexp-alist)
+  (set (make-local-variable 'compilation-error-regexp-alist)
+       diff-error-regexp-alist)
+  (when (string-match "\\.rej\\'" (or buffer-file-name ""))
+    (set (make-local-variable 'compilation-current-file)
+	 (substring buffer-file-name 0 (match-beginning 0))))
+  (compilation-shell-minor-mode 1)
+  ;; 
+  (setq buffer-read-only t)
+  (if (not diff-update-on-the-fly-flag)
+      (add-hook 'write-contents-hooks 'diff-write-contents-hooks)
+    (make-local-variable 'diff-unhandled-changes)
+    (make-local-hook 'after-change-functions)
+    (add-hook 'after-change-functions 'diff-after-change-function nil t)
+    (make-local-hook 'post-command-hook)
+    (add-hook 'post-command-hook 'diff-post-command-hook nil t))
+  ;; Neat trick from Dave Love to add more bindings in read-only mode:
+  (add-to-list (make-local-variable 'minor-mode-map-alist)
+	       (cons 'buffer-read-only diff-mode-shared-map))
+  ;;
+  (run-hooks 'diff-mode-hook))
+
+;;;###autoload
+(add-to-list 'auto-mode-alist '("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode))
+
+;; provide the package
+(provide 'diff-mode)
+
+;;; Change Log:
+;; diff-mode.el,v
+;; 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.
+;;
+
+;;; diff-mode.el ends here