| blob | a9d124700b89f78d89b7ee5f4ba933c0a9dc9692 |
1 ;;; diff-mode.el --- a mode for viewing/editing context diffs -*- lexical-binding: t -*-
3 ;; Copyright (C) 1998-2012 Free Software Foundation, Inc.
5 ;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
6 ;; Keywords: convenience patch diff vc
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software: you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation, either version 3 of the License, or
13 ;; (at your option) any later version.
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
23 ;;; Commentary:
25 ;; Provides support for font-lock, outline, navigation
26 ;; commands, editing and various conversions as well as jumping
27 ;; to the corresponding source file.
29 ;; Inspired by Pavel Machek's patch-mode.el (<pavel@@atrey.karlin.mff.cuni.cz>)
30 ;; Some efforts were spent to have it somewhat compatible with XEmacs's
31 ;; diff-mode as well as with compilation-minor-mode
33 ;; Bugs:
35 ;; - Reverse doesn't work with normal diffs.
37 ;; Todo:
39 ;; - Improve `diff-add-change-log-entries-other-window',
40 ;; it is very simplistic now.
41 ;;
42 ;; - Add a `delete-after-apply' so C-c C-a automatically deletes hunks.
43 ;; Also allow C-c C-a to delete already-applied hunks.
44 ;;
45 ;; - Try `diff <file> <hunk>' to try and fuzzily discover the source location
46 ;; of a hunk. Show then the changes between <file> and <hunk> and make it
47 ;; possible to apply them to <file>, <hunk-src>, or <hunk-dst>.
48 ;; Or maybe just make it into a ".rej to diff3-markers converter".
49 ;; Maybe just use `wiggle' (by Neil Brown) to do it for us.
50 ;;
51 ;; - in diff-apply-hunk, strip context in replace-match to better
52 ;; preserve markers and spacing.
53 ;; - Handle `diff -b' output in context->unified.
55 ;;; Code:
62 "Major mode for viewing/editing diffs."
68 "If non-nil, `diff-mode' buffers default to being read-only."
73 "Non-nil means `diff-goto-source' jumps to the old file.
74 Else, it jumps to the new file."
79 "Non-nil means hunk headers are kept up-to-date on-the-fly.
80 When editing a diff file, the line numbers in the hunk headers
81 need to be kept consistent with the actual diff. This can
82 either be done on the fly (but this sometimes interacts poorly with the
83 undo mechanism) or whenever the file is written (can be slow
84 when editing big diffs)."
89 "Non-nil means `diff-apply-hunk' will move to the next hunk after applying."
94 "Run after setting up the `diff-mode' major mode."
105 ;;;;
106 ;;;; keymap, menu, ...
107 ;;;;
116 ("k" . diff-hunk-kill)
117 ("K" . diff-file-kill)
118 ("}" . diff-file-next) ; From compilation-minor-mode.
119 ("{" . diff-file-prev)
120 ("\C-m" . diff-goto-source)
121 ([mouse-2] . diff-goto-source)
122 ("W" . widen)
123 ("o" . diff-goto-source) ; other-window
124 ("A" . diff-ediff-patch)
125 ("r" . diff-restrict-view)
126 ("R" . diff-reverse-direction)
127 ("/" . diff-undo)
128 ([remap undo] . diff-undo))
129 "Basic keymap for `diff-mode', bound to various prefix keys."
130 :inherit special-mode-map)
132 (easy-mmode-defmap diff-mode-map
133 `(("\e" . ,(let ((map (make-sparse-keymap)))
134 ;; We want to inherit most bindings from diff-mode-shared-map,
135 ;; but not all since they may hide useful M-<foo> global
136 ;; bindings when editing.
137 (set-keymap-parent map diff-mode-shared-map)
138 (dolist (key '("A" "r" "R" "g" "q" "W" "z"))
139 (define-key map key nil))
140 map))
141 ;; From compilation-minor-mode.
142 ("\C-c\C-c" . diff-goto-source)
143 ;; By analogy with the global C-x 4 a binding.
144 ("\C-x4A" . diff-add-change-log-entries-other-window)
145 ;; Misc operations.
146 ("\C-c\C-a" . diff-apply-hunk)
147 ("\C-c\C-e" . diff-ediff-patch)
148 ("\C-c\C-n" . diff-restrict-view)
149 ("\C-c\C-s" . diff-split-hunk)
150 ("\C-c\C-t" . diff-test-hunk)
151 ("\C-c\C-r" . diff-reverse-direction)
152 ("\C-c\C-u" . diff-context->unified)
153 ;; `d' because it duplicates the context :-( --Stef
154 ("\C-c\C-d" . diff-unified->context)
155 ("\C-c\C-w" . diff-ignore-whitespace-hunk)
156 ("\C-c\C-b" . diff-refine-hunk) ;No reason for `b' :-(
157 ("\C-c\C-f" . next-error-follow-minor-mode))
158 "Keymap for `diff-mode'. See also `diff-mode-shared-map'.")
160 (easy-menu-define diff-mode-menu diff-mode-map
161 "Menu for `diff-mode'."
162 '("Diff"
163 ["Jump to Source" diff-goto-source
164 :help "Jump to the corresponding source line"]
165 ["Apply hunk" diff-apply-hunk
166 :help "Apply the current hunk to the source file and go to the next"]
167 ["Test applying hunk" diff-test-hunk
168 :help "See whether it's possible to apply the current hunk"]
169 ["Apply diff with Ediff" diff-ediff-patch
170 :help "Call `ediff-patch-file' on the current buffer"]
171 ["Create Change Log entries" diff-add-change-log-entries-other-window
172 :help "Create ChangeLog entries for the changes in the diff buffer"]
173 "-----"
174 ["Reverse direction" diff-reverse-direction
175 :help "Reverse the direction of the diffs"]
176 ["Context -> Unified" diff-context->unified
177 :help "Convert context diffs to unified diffs"]
178 ["Unified -> Context" diff-unified->context
179 :help "Convert unified diffs to context diffs"]
180 ;;["Fixup Headers" diff-fixup-modifs (not buffer-read-only)]
181 ["Show trailing whitespace" whitespace-mode
182 :style toggle :selected (bound-and-true-p whitespace-mode)
183 :help "Show trailing whitespace in modified lines"]
184 "-----"
185 ["Split hunk" diff-split-hunk
186 :active (diff-splittable-p)
187 :help "Split the current (unified diff) hunk at point into two hunks"]
188 ["Ignore whitespace changes" diff-ignore-whitespace-hunk
189 :help "Re-diff the current hunk, ignoring whitespace differences"]
190 ["Highlight fine changes" diff-refine-hunk
191 :help "Highlight changes of hunk at point at a finer granularity"]
192 ["Kill current hunk" diff-hunk-kill
193 :help "Kill current hunk"]
194 ["Kill current file's hunks" diff-file-kill
195 :help "Kill all current file's hunks"]
196 "-----"
197 ["Previous Hunk" diff-hunk-prev
198 :help "Go to the previous count'th hunk"]
199 ["Next Hunk" diff-hunk-next
200 :help "Go to the next count'th hunk"]
201 ["Previous File" diff-file-prev
202 :help "Go to the previous count'th file"]
203 ["Next File" diff-file-next
204 :help "Go to the next count'th file"]
205 ))
207 (defcustom diff-minor-mode-prefix "\C-c="
208 "Prefix key for `diff-minor-mode' commands."
209 :type '(choice (string "\e") (string "C-c=") string)
210 :group 'diff-mode)
212 (easy-mmode-defmap diff-minor-mode-map
213 `((,diff-minor-mode-prefix . ,diff-mode-shared-map))
214 "Keymap for `diff-minor-mode'. See also `diff-mode-shared-map'.")
216 (define-minor-mode diff-auto-refine-mode
217 "Toggle automatic diff hunk highlighting (Diff Auto Refine mode).
218 With a prefix argument ARG, enable Diff Auto Refine mode if ARG
219 is positive, and disable it otherwise. If called from Lisp,
220 enable the mode if ARG is omitted or nil.
222 Diff Auto Refine mode is a buffer-local minor mode used with
223 `diff-mode'. When enabled, Emacs automatically highlights
224 changes in detail as the user visits hunks. When transitioning
225 from disabled to enabled, it tries to refine the current hunk, as
226 well."
227 :group 'diff-mode :init-value t :lighter nil ;; " Auto-Refine"
228 (when diff-auto-refine-mode
229 (condition-case-unless-debug nil (diff-refine-hunk) (error nil))))
231 ;;;;
232 ;;;; font-lock support
233 ;;;;
235 (defface diff-header
236 '((((class color) (min-colors 88) (background light))
237 :background "grey80")
238 (((class color) (min-colors 88) (background dark))
239 :background "grey45")
240 (((class color))
241 :foreground "blue1" :weight bold)
242 (t :weight bold))
243 "`diff-mode' face inherited by hunk and index header faces."
244 :group 'diff-mode)
245 (define-obsolete-face-alias 'diff-header-face 'diff-header "22.1")
246 (defvar diff-header-face 'diff-header)
248 (defface diff-file-header
249 '((((class color) (min-colors 88) (background light))
250 :background "grey70" :weight bold)
251 (((class color) (min-colors 88) (background dark))
252 :background "grey60" :weight bold)
253 (((class color))
254 :foreground "cyan" :weight bold)
255 (t :weight bold)) ; :height 1.3
256 "`diff-mode' face used to highlight file header lines."
257 :group 'diff-mode)
258 (define-obsolete-face-alias 'diff-file-header-face 'diff-file-header "22.1")
259 (defvar diff-file-header-face 'diff-file-header)
261 (defface diff-index
262 '((t :inherit diff-file-header))
263 "`diff-mode' face used to highlight index header lines."
264 :group 'diff-mode)
265 (define-obsolete-face-alias 'diff-index-face 'diff-index "22.1")
266 (defvar diff-index-face 'diff-index)
268 (defface diff-hunk-header
269 '((t :inherit diff-header))
270 "`diff-mode' face used to highlight hunk header lines."
271 :group 'diff-mode)
272 (define-obsolete-face-alias 'diff-hunk-header-face 'diff-hunk-header "22.1")
273 (defvar diff-hunk-header-face 'diff-hunk-header)
275 (defface diff-removed
276 '((default
277 :inherit diff-changed)
278 (((class color) (min-colors 88) (background light))
279 :background "#ffdddd")
280 (((class color) (min-colors 88) (background dark))
281 :background "#553333")
282 (((class color))
283 :foreground "red"))
284 "`diff-mode' face used to highlight removed lines."
285 :group 'diff-mode)
286 (define-obsolete-face-alias 'diff-removed-face 'diff-removed "22.1")
287 (defvar diff-removed-face 'diff-removed)
289 (defface diff-added
290 '((default
291 :inherit diff-changed)
292 (((class color) (min-colors 88) (background light))
293 :background "#ddffdd")
294 (((class color) (min-colors 88) (background dark))
295 :background "#335533")
296 (((class color))
297 :foreground "green"))
298 "`diff-mode' face used to highlight added lines."
299 :group 'diff-mode)
300 (define-obsolete-face-alias 'diff-added-face 'diff-added "22.1")
301 (defvar diff-added-face 'diff-added)
303 (defface diff-changed
304 ;; We normally apply a `shadow'-based face on the `diff-context'
305 ;; face, and keep `diff-changed' the default.
306 '((((class color grayscale) (min-colors 88)))
307 ;; If the terminal lacks sufficient colors for shadowing,
308 ;; highlight changed lines explicitly.
309 (((class color))
310 :foreground "yellow"))
311 "`diff-mode' face used to highlight changed lines."
312 :group 'diff-mode)
313 (define-obsolete-face-alias 'diff-changed-face 'diff-changed "22.1")
314 (defvar diff-changed-face 'diff-changed)
316 (defface diff-indicator-removed
317 '((t :inherit diff-removed))
318 "`diff-mode' face used to highlight indicator of removed lines (-, <)."
319 :group 'diff-mode
320 :version "22.1")
321 (defvar diff-indicator-removed-face 'diff-indicator-removed)
323 (defface diff-indicator-added
324 '((t :inherit diff-added))
325 "`diff-mode' face used to highlight indicator of added lines (+, >)."
326 :group 'diff-mode
327 :version "22.1")
328 (defvar diff-indicator-added-face 'diff-indicator-added)
330 (defface diff-indicator-changed
331 '((t :inherit diff-changed))
332 "`diff-mode' face used to highlight indicator of changed lines."
333 :group 'diff-mode
334 :version "22.1")
335 (defvar diff-indicator-changed-face 'diff-indicator-changed)
337 (defface diff-function
338 '((t :inherit diff-header))
340 :group 'diff-mode)
341 (define-obsolete-face-alias 'diff-function-face 'diff-function "22.1")
342 (defvar diff-function-face 'diff-function)
344 (defface diff-context
345 '((((class color grayscale) (min-colors 88)) :inherit shadow))
346 "`diff-mode' face used to highlight context and other side-information."
347 :group 'diff-mode)
348 (define-obsolete-face-alias 'diff-context-face 'diff-context "22.1")
349 (defvar diff-context-face 'diff-context)
351 (defface diff-nonexistent
352 '((t :inherit diff-file-header))
353 "`diff-mode' face used to highlight nonexistent files in recursive diffs."
354 :group 'diff-mode)
355 (define-obsolete-face-alias 'diff-nonexistent-face 'diff-nonexistent "22.1")
356 (defvar diff-nonexistent-face 'diff-nonexistent)
358 (defconst diff-yank-handler '(diff-yank-function))
359 (defun diff-yank-function (text)
360 ;; FIXME: the yank-handler is now called separately on each piece of text
361 ;; with a yank-handler property, so the next-single-property-change call
362 ;; below will always return nil :-( --stef
363 (let ((mixed (next-single-property-change 0 'yank-handler text))
364 (start (point)))
365 ;; First insert the text.
366 (insert text)
367 ;; If the text does not include any diff markers and if we're not
368 ;; yanking back into a diff-mode buffer, get rid of the prefixes.
369 (unless (or mixed (derived-mode-p 'diff-mode))
370 (undo-boundary) ; Just in case the user wanted the prefixes.
371 (let ((re (save-excursion
373 (if (eq (char-after) ?!)
375 "^[ <>!+-]"))))
376 (save-excursion
377 (while (re-search-backward re start t)
378 (replace-match "" t t)))))))
380 (defconst diff-hunk-header-re-unified
382 (defconst diff-context-mid-hunk-header-re
385 (defvar diff-use-changed-face (and (face-differs-from-default-p diff-changed-face)
386 (not (face-equal diff-changed-face diff-added-face))
387 (not (face-equal diff-changed-face diff-removed-face)))
388 "If non-nil, use the face `diff-changed' for changed lines in context diffs.
389 Otherwise, use the face `diff-removed' for removed lines,
390 and the face `diff-added' for added lines.")
392 (defvar diff-font-lock-keywords
394 (1 diff-hunk-header-face) (6 diff-function-face))
396 (1 diff-hunk-header-face) (2 diff-function-face))
398 (,diff-context-mid-hunk-header-re . diff-hunk-header-face) ;context
399 ("^[0-9,]+[acd][0-9,]+$" . diff-hunk-header-face) ;normal
400 ("^---$" . diff-hunk-header-face) ;normal
401 ;; For file headers, accept files with spaces, but be careful to rule
402 ;; out false-positives when matching hunk headers.
403 ("^\\(---\\|\\+\\+\\+\\|\\*\\*\\*\\) \\([^\t\n]+?\\)\\(?:\t.*\\| \\(\\*\\*\\*\\*\\|----\\)\\)?\n"
404 (0 diff-header-face)
405 (2 (if (not (match-end 3)) diff-file-header-face) prepend))
407 (1 diff-indicator-removed-face) (2 diff-removed-face))
409 (1 diff-indicator-added-face) (2 diff-added-face))
411 (1 (if diff-use-changed-face
412 diff-indicator-changed-face
413 ;; Otherwise, search for `diff-context-mid-hunk-header-re' and
414 ;; if the line of context diff is above, use `diff-removed-face';
415 ;; if below, use `diff-added-face'.
416 (save-match-data
417 (let ((limit (save-excursion (diff-beginning-of-hunk))))
418 (if (save-excursion (re-search-backward diff-context-mid-hunk-header-re limit t))
419 diff-indicator-added-face
420 diff-indicator-removed-face)))))
421 (2 (if diff-use-changed-face
422 diff-changed-face
423 ;; Otherwise, use the same method as above.
424 (save-match-data
425 (let ((limit (save-excursion (diff-beginning-of-hunk))))
426 (if (save-excursion (re-search-backward diff-context-mid-hunk-header-re limit t))
427 diff-added-face
428 diff-removed-face))))))
430 (0 diff-header-face) (1 diff-index-face prepend))
433 (1 font-lock-comment-delimiter-face)
434 (2 font-lock-comment-face))
437 (defconst diff-font-lock-defaults
438 '(diff-font-lock-keywords t nil nil nil (font-lock-multiline . nil)))
440 (defvar diff-imenu-generic-expression
441 ;; Prefer second name as first is most likely to be a backup or
443 ;; catches Debian source diff files (which lack the trailing date).
447 ;;;;
448 ;;;; Movement
449 ;;;;
451 (defvar diff-valid-unified-empty-line t
452 "If non-nil, empty lines are valid in unified diffs.
453 Some versions of diff replace all-blank context lines in unified format with
454 empty lines. This makes the format less robust, but is tolerated.
455 See http://lists.gnu.org/archive/html/emacs-devel/2007-11/msg01990.html")
457 (defconst diff-hunk-header-re
458 (concat "^\\(?:" diff-hunk-header-re-unified ".*\\|\\*\\{15\\}.*\n\\*\\*\\* .+ \\*\\*\\*\\*\\|[0-9]+\\(,[0-9]+\\)?[acd][0-9]+\\(,[0-9]+\\)?\\)$"))
459 (defconst diff-file-header-re (concat "^\\(--- .+\n\\+\\+\\+ \\|\\*\\*\\* .+\n--- \\|[^-+!<>0-9@* \n]\\).+\n" (substring diff-hunk-header-re 1)))
460 (defvar diff-narrowed-to nil)
462 (defun diff-hunk-style (&optional style)
463 (when (looking-at diff-hunk-header-re)
464 (setq style (cdr (assq (char-after) '((?@ . unified) (?* . context)))))
465 (goto-char (match-end 0)))
466 style)
468 (defun diff-end-of-hunk (&optional style donttrustheader)
469 "Advance to the end of the current hunk, and return its position."
470 (let (end)
471 (when (looking-at diff-hunk-header-re)
472 ;; Especially important for unified (because headers are ambiguous).
473 (setq style (diff-hunk-style style))
474 (goto-char (match-end 0))
475 (when (and (not donttrustheader) (match-end 2))
476 (let* ((nold (string-to-number (or (match-string 2) "1")))
477 (nnew (string-to-number (or (match-string 4) "1")))
478 (endold
479 (save-excursion
480 (re-search-forward (if diff-valid-unified-empty-line
482 nil t nold)
483 (line-beginning-position 2)))
484 (endnew
485 ;; The hunk may end with a bunch of "+" lines, so the `end' is
486 ;; then further than computed above.
487 (save-excursion
488 (re-search-forward (if diff-valid-unified-empty-line
490 nil t nnew)
491 (line-beginning-position 2))))
492 (setq end (max endold endnew)))))
493 ;; We may have a first evaluation of `end' thanks to the hunk header.
494 (unless end
495 (setq end (and (re-search-forward
496 (pcase style
497 (`unified
498 (concat (if diff-valid-unified-empty-line
500 ;; A `unified' header is ambiguous.
501 diff-file-header-re))
505 nil t)
506 (match-beginning 0)))
507 (when diff-valid-unified-empty-line
508 ;; While empty lines may be valid inside hunks, they are also likely
509 ;; to be unrelated to the hunk.
510 (goto-char (or end (point-max)))
512 (forward-char -1)
513 (setq end (point)))))
514 ;; The return value is used by easy-mmode-define-navigation.
515 (goto-char (or end (point-max)))))
517 (defun diff-beginning-of-hunk (&optional try-harder)
518 "Move back to the previous hunk beginning, and return its position.
519 If point is in a file header rather than a hunk, advance to the
520 next hunk if TRY-HARDER is non-nil; otherwise signal an error."
521 (beginning-of-line)
522 (if (looking-at diff-hunk-header-re)
523 (point)
524 (forward-line 1)
525 (condition-case ()
526 (re-search-backward diff-hunk-header-re)
527 (error
528 (unless try-harder
529 (error "Can't find the beginning of the hunk"))
530 (diff-beginning-of-file-and-junk)
531 (diff-hunk-next)
532 (point)))))
534 (defun diff-unified-hunk-p ()
535 (save-excursion
536 (ignore-errors
537 (diff-beginning-of-hunk)
538 (looking-at "^@@"))))
540 (defun diff-beginning-of-file ()
541 (beginning-of-line)
542 (unless (looking-at diff-file-header-re)
543 (let ((start (point))
544 res)
545 ;; diff-file-header-re may need to match up to 4 lines, so in case
546 ;; we're inside the header, we need to move up to 3 lines forward.
547 (forward-line 3)
548 (if (and (setq res (re-search-backward diff-file-header-re nil t))
549 ;; Maybe the 3 lines forward were too much and we matched
550 ;; a file header after our starting point :-(
551 (or (<= (point) start)
552 (setq res (re-search-backward diff-file-header-re nil t))))
553 res
554 (goto-char start)
555 (error "Can't find the beginning of the file")))))
558 (defun diff-end-of-file ()
561 nil 'move)
562 (if (match-beginning 1)
563 (goto-char (match-beginning 1))
564 (beginning-of-line)))
566 ;; Define diff-{hunk,file}-{prev,next}
567 (easy-mmode-define-navigation
568 diff-hunk diff-hunk-header-re "hunk" diff-end-of-hunk diff-restrict-view
569 (if diff-auto-refine-mode
570 (condition-case-unless-debug nil (diff-refine-hunk) (error nil))))
572 (easy-mmode-define-navigation
573 diff-file diff-file-header-re "file" diff-end-of-file)
575 (defun diff-bounds-of-hunk ()
576 "Return the bounds of the diff hunk at point.
577 The return value is a list (BEG END), which are the hunk's start
578 and end positions. Signal an error if no hunk is found. If
579 point is in a file header, return the bounds of the next hunk."
580 (save-excursion
581 (let ((pos (point))
582 (beg (diff-beginning-of-hunk t))
583 (end (diff-end-of-hunk)))
584 (cond ((>= end pos)
585 (list beg end))
586 ;; If this hunk ends above POS, consider the next hunk.
587 ((re-search-forward diff-hunk-header-re nil t)
588 (list (match-beginning 0) (diff-end-of-hunk)))
589 (t (error "No hunk found"))))))
591 (defun diff-bounds-of-file ()
592 "Return the bounds of the file segment at point.
593 The return value is a list (BEG END), which are the segment's
594 start and end positions."
595 (save-excursion
596 (let ((pos (point))
597 (beg (progn (diff-beginning-of-file-and-junk)
598 (point))))
599 (diff-end-of-file)
600 ;; bzr puts a newline after the last hunk.
602 (forward-char 1))
603 (if (> pos (point))
604 (error "Not inside a file diff"))
605 (list beg (point)))))
607 (defun diff-restrict-view (&optional arg)
608 "Restrict the view to the current hunk.
609 If the prefix ARG is given, restrict the view to the current file instead."
610 (interactive "P")
611 (apply 'narrow-to-region
612 (if arg (diff-bounds-of-file) (diff-bounds-of-hunk)))
613 (set (make-local-variable 'diff-narrowed-to) (if arg 'file 'hunk)))
615 (defun diff-hunk-kill ()
616 "Kill the hunk at point."
617 (interactive)
618 (let* ((hunk-bounds (diff-bounds-of-hunk))
619 (file-bounds (ignore-errors (diff-bounds-of-file)))
620 ;; If the current hunk is the only one for its file, kill the
621 ;; file header too.
622 (bounds (if (and file-bounds
623 (progn (goto-char (car file-bounds))
624 (= (progn (diff-hunk-next) (point))
625 (car hunk-bounds)))
626 (progn (goto-char (cadr hunk-bounds))
627 ;; bzr puts a newline after the last hunk.
629 (forward-char 1))
630 (= (point) (cadr file-bounds))))
631 file-bounds
632 hunk-bounds))
633 (inhibit-read-only t))
634 (apply 'kill-region bounds)
635 (goto-char (car bounds))))
637 ;; "index ", "old mode", "new mode", "new file mode" and
638 ;; "deleted file mode" are output by git-diff.
639 (defconst diff-file-junk-re
642 (defun diff-beginning-of-file-and-junk ()
643 "Go to the beginning of file-related diff-info.
644 This is like `diff-beginning-of-file' except it tries to skip back over leading
646 (let* ((orig (point))
647 ;; Skip forward over what might be "leading junk" so as to get
648 ;; closer to the actual diff.
649 (_ (progn (beginning-of-line)
650 (while (looking-at diff-file-junk-re)
651 (forward-line 1))))
652 (start (point))
653 (prevfile (condition-case err
654 (save-excursion (diff-beginning-of-file) (point))
655 (error err)))
656 (err (if (consp prevfile) prevfile))
657 (nextfile (ignore-errors
658 (save-excursion
659 (goto-char start) (diff-file-next) (point))))
660 ;; prevhunk is one of the limits.
661 (prevhunk (save-excursion
662 (ignore-errors
663 (if (numberp prevfile) (goto-char prevfile))
664 (diff-hunk-prev) (point))))
665 (previndex (save-excursion
666 (forward-line 1) ;In case we're looking at "Index:".
667 (re-search-backward "^Index: " prevhunk t))))
668 ;; If we're in the junk, we should use nextfile instead of prevfile.
669 (if (and (numberp nextfile)
670 (or (not (numberp prevfile))
671 (and previndex (> previndex prevfile))))
672 (setq prevfile nextfile))
673 (if (and previndex (numberp prevfile) (< previndex prevfile))
674 (setq prevfile previndex))
675 (if (and (numberp prevfile) (<= prevfile start))
676 (progn
677 (goto-char prevfile)
678 ;; Now skip backward over the leading junk we may have before the
679 ;; diff itself.
680 (while (save-excursion
681 (and (zerop (forward-line -1))
682 (looking-at diff-file-junk-re)))
683 (forward-line -1)))
684 ;; File starts *after* the starting point: we really weren't in
685 ;; a file diff but elsewhere.
686 (goto-char orig)
687 (signal (car err) (cdr err)))))
689 (defun diff-file-kill ()
690 "Kill current file's hunks."
691 (interactive)
692 (let ((inhibit-read-only t))
693 (apply 'kill-region (diff-bounds-of-file))))
695 (defun diff-kill-junk ()
696 "Kill spurious empty diffs."
697 (interactive)
698 (save-excursion
699 (let ((inhibit-read-only t))
700 (goto-char (point-min))
705 nil t)
706 (delete-region (if (match-end 4) (match-beginning 0) (match-end 1))
707 (match-beginning 3))
708 (beginning-of-line)))))
710 (defun diff-count-matches (re start end)
711 (save-excursion
712 (let ((n 0))
713 (goto-char start)
714 (while (re-search-forward re end t) (cl-incf n))
715 n)))
717 (defun diff-splittable-p ()
718 (save-excursion
719 (beginning-of-line)
720 (and (looking-at "^[-+ ]")
721 (progn (forward-line -1) (looking-at "^[-+ ]"))
722 (diff-unified-hunk-p))))
724 (defun diff-split-hunk ()
725 "Split the current (unified diff) hunk at point into two hunks."
726 (interactive)
727 (beginning-of-line)
728 (let ((pos (point))
729 (start (diff-beginning-of-hunk)))
730 (unless (looking-at diff-hunk-header-re-unified)
731 (error "diff-split-hunk only works on unified context diffs"))
732 (forward-line 1)
733 (let* ((start1 (string-to-number (match-string 1)))
734 (start2 (string-to-number (match-string 3)))
737 (inhibit-read-only t))
738 (goto-char pos)
739 ;; Hopefully the after-change-function will not screw us over.
740 (insert "@@ -" (number-to-string newstart1) ",1 +"
742 ;; Fix the original hunk-header.
743 (diff-fixup-modifs start pos))))
746 ;;;;
747 ;;;; jump to other buffers
748 ;;;;
750 (defvar diff-remembered-files-alist nil)
751 (defvar diff-remembered-defdir nil)
753 (defun diff-filename-drop-dir (file)
754 (when (string-match "/" file) (substring file (match-end 0))))
756 (defun diff-merge-strings (ancestor from to)
757 "Merge the diff between ANCESTOR and FROM into TO.
758 Returns the merged string if successful or nil otherwise.
760 If ANCESTOR = FROM, returns TO.
761 If ANCESTOR = TO, returns FROM.
762 The heuristic is simplistic and only really works for cases
764 ;; Ideally, we want:
765 ;; AMB ANB CMD -> CND
766 ;; but that's ambiguous if `foo' or `bar' is empty:
767 ;; a/foo a/foo1 b/foo.c -> b/foo1.c but not 1b/foo.c or b/foo.c1
769 (when (and (string-match (concat
773 (equal to (match-string 5 str)))
774 (concat (substring str (match-beginning 5) (match-beginning 6))
775 (match-string 4 str)
776 (substring str (match-end 6) (match-end 5))))))
778 (defun diff-tell-file-name (old name)
779 "Tell Emacs where the find the source file of the current hunk.
780 If the OLD prefix arg is passed, tell the file NAME of the old file."
781 (interactive
782 (let* ((old current-prefix-arg)
783 (fs (diff-hunk-file-names current-prefix-arg)))
784 (unless fs (error "No file name to look for"))
785 (list old (read-file-name (format "File for %s: " (car fs))
786 nil (diff-find-file-name old 'noprompt) t))))
787 (let ((fs (diff-hunk-file-names old)))
788 (unless fs (error "No file name to look for"))
789 (push (cons fs name) diff-remembered-files-alist)))
791 (defun diff-hunk-file-names (&optional old)
792 "Give the list of file names textually mentioned for the current hunk."
793 (save-excursion
794 (unless (looking-at diff-file-header-re)
795 (or (ignore-errors (diff-beginning-of-file))
796 (re-search-forward diff-file-header-re nil t)))
797 (let ((limit (save-excursion
798 (condition-case ()
799 (progn (diff-hunk-prev) (point))
800 (error (point-min)))))
801 (header-files
803 (list (if old (match-string 1) (match-string 3))
804 (if old (match-string 3) (match-string 1)))
805 (forward-line 1) nil)))
806 (delq nil
807 (append
808 (when (and (not old)
809 (save-excursion
811 (list (match-string 1)))
812 header-files
813 (when (re-search-backward
815 nil t)
816 (list (if old (match-string 2) (match-string 4))
817 (if old (match-string 4) (match-string 2)))))))))
819 (defun diff-find-file-name (&optional old noprompt prefix)
820 "Return the file corresponding to the current patch.
821 Non-nil OLD means that we want the old file.
822 Non-nil NOPROMPT means to prefer returning nil than to prompt the user.
823 PREFIX is only used internally: don't use it."
824 (unless (equal diff-remembered-defdir default-directory)
825 ;; Flush diff-remembered-files-alist if the default-directory is changed.
826 (set (make-local-variable 'diff-remembered-defdir) default-directory)
827 (set (make-local-variable 'diff-remembered-files-alist) nil))
828 (save-excursion
829 (unless (looking-at diff-file-header-re)
830 (or (ignore-errors (diff-beginning-of-file))
831 (re-search-forward diff-file-header-re nil t)))
832 (let ((fs (diff-hunk-file-names old)))
833 (if prefix (setq fs (mapcar (lambda (f) (concat prefix f)) fs)))
834 (or
835 ;; use any previously used preference
836 (cdr (assoc fs diff-remembered-files-alist))
837 ;; try to be clever and use previous choices as an inspiration
838 (cl-dolist (rf diff-remembered-files-alist)
839 (let ((newfile (diff-merge-strings (caar rf) (car fs) (cdr rf))))
840 (if (and newfile (file-exists-p newfile)) (cl-return newfile))))
841 ;; look for each file in turn. If none found, try again but
842 ;; ignoring the first level of directory, ...
843 (cl-do* ((files fs (delq nil (mapcar 'diff-filename-drop-dir files)))
844 (file nil nil))
845 ((or (null files)
846 (setq file (cl-do* ((files files (cdr files))
847 (file (car files) (car files)))
848 ;; Use file-regular-p to avoid
849 ;; /dev/null, directories, etc.
850 ((or (null file) (file-regular-p file))
851 file))))
852 file))
853 ;; <foo>.rej patches implicitly apply to <foo>
855 (let ((file (substring buffer-file-name 0 (match-beginning 0))))
856 (when (file-exists-p file) file)))
857 ;; If we haven't found the file, maybe it's because we haven't paid
858 ;; attention to the PCL-CVS hint.
859 (and (not prefix)
860 (boundp 'cvs-pcl-cvs-dirchange-re)
861 (save-excursion
862 (re-search-backward cvs-pcl-cvs-dirchange-re nil t))
863 (diff-find-file-name old noprompt (match-string 1)))
864 ;; if all else fails, ask the user
865 (unless noprompt
866 (let ((file (expand-file-name (or (car fs) ""))))
867 (setq file
868 (read-file-name (format "Use file %s: " file)
869 (file-name-directory file) file t
870 (file-name-nondirectory file)))
871 (set (make-local-variable 'diff-remembered-files-alist)
872 (cons (cons fs file) diff-remembered-files-alist))
873 file))))))
876 (defun diff-ediff-patch ()
877 "Call `ediff-patch-file' on the current buffer."
878 (interactive)
879 (condition-case nil
880 (ediff-patch-file nil (current-buffer))
881 (wrong-number-of-arguments (ediff-patch-file))))
883 ;;;;
884 ;;;; Conversion functions
885 ;;;;
887 ;;(defvar diff-inhibit-after-change nil
888 ;; "Non-nil means inhibit `diff-mode's after-change functions.")
890 (defun diff-unified->context (start end)
891 "Convert unified diffs to context diffs.
892 START and END are either taken from the region (if a prefix arg is given) or
893 else cover the whole buffer."
894 (interactive (if (or current-prefix-arg (and transient-mark-mode mark-active))
895 (list (region-beginning) (region-end))
896 (list (point-min) (point-max))))
897 (unless (markerp end) (setq end (copy-marker end t)))
898 (let (;;(diff-inhibit-after-change t)
899 (inhibit-read-only t))
900 (save-excursion
901 (goto-char start)
902 (while (and (re-search-forward
905 nil t)
906 (< (point) end))
907 (combine-after-change-calls
908 (if (match-beginning 2)
909 ;; we matched a file header
910 (progn
911 ;; use reverse order to make sure the indices are kept valid
912 (replace-match "---" t t nil 3)
913 (replace-match "***" t t nil 2))
914 ;; we matched a hunk header
915 (let ((line1 (match-string 4))
916 (lines1 (or (match-string 5) "1"))
917 (line2 (match-string 6))
918 (lines2 (or (match-string 7) "1"))
919 ;; Variables to use the special undo function.
920 (old-undo buffer-undo-list)
921 (old-end (marker-position end))
922 (start (match-beginning 0))
923 (reversible t))
924 (replace-match
926 (number-to-string (+ (string-to-number line1)
927 (string-to-number lines1)
928 -1))
929 " ****"))
930 (save-restriction
931 (narrow-to-region (line-beginning-position 2)
932 ;; Call diff-end-of-hunk from just before
933 ;; the hunk header so it can use the hunk
934 ;; header info.
935 (progn (diff-end-of-hunk 'unified) (point)))
936 (let ((hunk (buffer-string)))
937 (goto-char (point-min))
938 (if (not (save-excursion (re-search-forward "^-" nil t)))
939 (delete-region (point) (point-max))
940 (goto-char (point-max))
941 (let ((modif nil) last-pt)
942 (while (progn (setq last-pt (point))
943 (= (forward-line -1) 0))
944 (pcase (char-after)
945 (?\s (insert " ") (setq modif nil) (backward-char 1))
946 (?+ (delete-region (point) last-pt) (setq modif t))
947 (?- (if (not modif)
948 (progn (forward-char 1)
949 (insert " "))
950 (delete-char 1)
951 (insert "! "))
952 (backward-char 2))
954 (= (char-after) ?+))
955 (delete-region (point) last-pt)
956 (setq modif t)))
957 ;; diff-valid-unified-empty-line.
959 (backward-char 2))
960 (_ (setq modif nil))))))
961 (goto-char (point-max))
962 (save-excursion
963 (insert "--- " line2 ","
964 (number-to-string (+ (string-to-number line2)
965 (string-to-number lines2)
966 -1))
968 ;;(goto-char (point-min))
969 (forward-line 1)
970 (if (not (save-excursion (re-search-forward "^+" nil t)))
971 (delete-region (point) (point-max))
972 (let ((modif nil) (delete nil))
974 nil t))
975 ;; Normally, lines in a substitution come with
976 ;; first the removals and then the additions, and
977 ;; the context->unified function follows this
978 ;; convention, of course. Yet, other alternatives
979 ;; are valid as well, but they preclude the use of
980 ;; context->unified as an undo command.
981 (setq reversible nil))
982 (while (not (eobp))
983 (pcase (char-after)
984 (?\s (insert " ") (setq modif nil) (backward-char 1))
985 (?- (setq delete t) (setq modif t))
986 (?+ (if (not modif)
987 (progn (forward-char 1)
988 (insert " "))
989 (delete-char 1)
990 (insert "! "))
991 (backward-char 2))
993 (not (eobp)))
994 (setq delete t) (setq modif t)))
995 ;; diff-valid-unified-empty-line.
997 (setq reversible nil))
998 (_ (setq modif nil)))
999 (let ((last-pt (point)))
1000 (forward-line 1)
1001 (when delete
1002 (delete-region last-pt (point))
1003 (setq delete nil)))))))
1004 (unless (or (not reversible) (eq buffer-undo-list t))
1005 ;; Drop the many undo entries and replace them with
1006 ;; a single entry that uses diff-context->unified to do
1007 ;; the work.
1008 (setq buffer-undo-list
1009 (cons (list 'apply (- old-end end) start (point-max)
1010 'diff-context->unified start (point-max))
1011 old-undo)))))))))))
1013 (defun diff-context->unified (start end &optional to-context)
1014 "Convert context diffs to unified diffs.
1015 START and END are either taken from the region
1016 \(when it is highlighted) or else cover the whole buffer.
1017 With a prefix argument, convert unified format to context format."
1018 (interactive (if (and transient-mark-mode mark-active)
1019 (list (region-beginning) (region-end) current-prefix-arg)
1020 (list (point-min) (point-max) current-prefix-arg)))
1021 (if to-context
1022 (diff-unified->context start end)
1023 (unless (markerp end) (setq end (copy-marker end t)))
1024 (let ( ;;(diff-inhibit-after-change t)
1025 (inhibit-read-only t))
1026 (save-excursion
1027 (goto-char start)
1028 (while (and (re-search-forward "^\\(\\(\\*\\*\\*\\) .+\n\\(---\\) .+\\|\\*\\{15\\}.*\n\\*\\*\\* \\([0-9]+\\),\\(-?[0-9]+\\) \\*\\*\\*\\*\\)$" nil t)
1029 (< (point) end))
1030 (combine-after-change-calls
1031 (if (match-beginning 2)
1032 ;; we matched a file header
1033 (progn
1034 ;; use reverse order to make sure the indices are kept valid
1035 (replace-match "+++" t t nil 3)
1036 (replace-match "---" t t nil 2))
1037 ;; we matched a hunk header
1038 (let ((line1s (match-string 4))
1039 (line1e (match-string 5))
1040 (pt1 (match-beginning 0))
1041 ;; Variables to use the special undo function.
1042 (old-undo buffer-undo-list)
1043 (old-end (marker-position end))
1044 (reversible t))
1045 (replace-match "")
1046 (unless (re-search-forward
1047 diff-context-mid-hunk-header-re nil t)
1048 (error "Can't find matching `--- n1,n2 ----' line"))
1049 (let ((line2s (match-string 1))
1050 (line2e (match-string 2))
1051 (pt2 (progn
1052 (delete-region (progn (beginning-of-line) (point))
1053 (progn (forward-line 1) (point)))
1054 (point-marker))))
1055 (goto-char pt1)
1056 (forward-line 1)
1057 (while (< (point) pt2)
1058 (pcase (char-after)
1059 (?! (delete-char 2) (insert "-") (forward-line 1))
1060 (?- (forward-char 1) (delete-char 1) (forward-line 1))
1061 (?\s ;merge with the other half of the chunk
1062 (let* ((endline2
1063 (save-excursion
1064 (goto-char pt2) (forward-line 1) (point))))
1065 (pcase (char-after pt2)
1066 ((or ?! ?+)
1067 (insert "+"
1068 (prog1
1069 (buffer-substring (+ pt2 2) endline2)
1070 (delete-region pt2 endline2))))
1071 (?\s
1072 (unless (= (- endline2 pt2)
1073 (- (line-beginning-position 2) (point)))
1074 ;; If the two lines we're merging don't have the
1075 ;; same length (can happen with "diff -b"), then
1076 ;; diff-unified->context will not properly undo
1077 ;; this operation.
1078 (setq reversible nil))
1079 (delete-region pt2 endline2)
1080 (delete-char 1)
1081 (forward-line 1))
1083 (_ (setq reversible nil)
1084 (delete-char 1) (forward-line 1)))))
1085 (_ (setq reversible nil) (forward-line 1))))
1086 (while (looking-at "[+! ] ")
1087 (if (/= (char-after) ?!) (forward-char 1)
1088 (delete-char 1) (insert "+"))
1089 (delete-char 1) (forward-line 1))
1090 (save-excursion
1091 (goto-char pt1)
1092 (insert "@@ -" line1s ","
1093 (number-to-string (- (string-to-number line1e)
1094 (string-to-number line1s)
1095 -1))
1096 " +" line2s ","
1097 (number-to-string (- (string-to-number line2e)
1098 (string-to-number line2s)
1099 -1)) " @@"))
1100 (set-marker pt2 nil)
1101 ;; The whole procedure succeeded, let's replace the myriad
1102 ;; of undo elements with just a single special one.
1103 (unless (or (not reversible) (eq buffer-undo-list t))
1104 (setq buffer-undo-list
1105 (cons (list 'apply (- old-end end) pt1 (point)
1106 'diff-unified->context pt1 (point))
1107 old-undo)))
1108 )))))))))
1110 (defun diff-reverse-direction (start end)
1111 "Reverse the direction of the diffs.
1112 START and END are either taken from the region (if a prefix arg is given) or
1113 else cover the whole buffer."
1114 (interactive (if (or current-prefix-arg (and transient-mark-mode mark-active))
1115 (list (region-beginning) (region-end))
1116 (list (point-min) (point-max))))
1117 (unless (markerp end) (setq end (copy-marker end t)))
1118 (let (;;(diff-inhibit-after-change t)
1119 (inhibit-read-only t))
1120 (save-excursion
1121 (goto-char start)
1122 (while (and (re-search-forward "^\\(\\([-*][-*][-*] \\)\\(.+\\)\n\\([-+][-+][-+] \\)\\(.+\\)\\|\\*\\{15\\}.*\n\\*\\*\\* \\(.+\\) \\*\\*\\*\\*\\|@@ -\\([0-9,]+\\) \\+\\([0-9,]+\\) @@.*\\)$" nil t)
1123 (< (point) end))
1124 (combine-after-change-calls
1125 (cond
1126 ;; a file header
1128 ;; a context-diff hunk header
1129 ((match-beginning 6)
1130 (let ((pt-lines1 (match-beginning 6))
1131 (lines1 (match-string 6)))
1132 (replace-match "" nil nil nil 6)
1133 (forward-line 1)
1134 (let ((half1s (point)))
1136 (when (= (char-after) ?-) (delete-char 1) (insert "+"))
1137 (forward-line 1))
1138 (let ((half1 (delete-and-extract-region half1s (point))))
1139 (unless (looking-at diff-context-mid-hunk-header-re)
1140 (insert half1)
1141 (error "Can't find matching `--- n1,n2 ----' line"))
1142 (let* ((str1end (or (match-end 2) (match-end 1)))
1143 (str1 (buffer-substring (match-beginning 1) str1end)))
1144 (goto-char str1end)
1145 (insert lines1)
1146 (delete-region (match-beginning 1) str1end)
1147 (forward-line 1)
1148 (let ((half2s (point)))
1150 (when (= (char-after) ?+) (delete-char 1) (insert "-"))
1151 (forward-line 1))
1152 (let ((half2 (delete-and-extract-region half2s (point))))
1153 (insert (or half1 ""))
1154 (goto-char half1s)
1155 (insert (or half2 ""))))
1156 (goto-char pt-lines1)
1157 (insert str1))))))
1158 ;; a unified-diff hunk header
1159 ((match-beginning 7)
1161 (forward-line 1)
1162 (let ((c (char-after)) first last)
1163 (while (pcase (setq c (char-after))
1164 (?- (setq first (or first (point)))
1165 (delete-char 1) (insert "+") t)
1166 (?+ (setq last (or last (point)))
1167 (delete-char 1) (insert "-") t)
1169 (_ (when (and first last (< first last))
1170 (insert (delete-and-extract-region first last)))
1171 (setq first nil last nil)
1172 (memq c (if diff-valid-unified-empty-line
1174 (forward-line 1))))))))))
1176 (defun diff-fixup-modifs (start end)
1177 "Fixup the hunk headers (in case the buffer was modified).
1178 START and END are either taken from the region (if a prefix arg is given) or
1179 else cover the whole buffer."
1180 (interactive (if (or current-prefix-arg (and transient-mark-mode mark-active))
1181 (list (region-beginning) (region-end))
1182 (list (point-min) (point-max))))
1183 (let ((inhibit-read-only t))
1184 (save-excursion
1185 (goto-char end) (diff-end-of-hunk nil 'donttrustheader)
1186 (let ((plus 0) (minus 0) (space 0) (bang 0))
1187 (while (and (= (forward-line -1) 0) (<= start (point)))
1188 (if (not (looking-at
1189 (concat diff-hunk-header-re-unified
1192 (pcase (char-after)
1193 (?\s (cl-incf space))
1194 (?+ (cl-incf plus))
1195 (?- (cl-incf minus))
1196 (?! (cl-incf bang))
1198 (_ (setq space 0 plus 0 minus 0 bang 0)))
1199 (cond
1200 ((looking-at diff-hunk-header-re-unified)
1201 (let* ((old1 (match-string 2))
1202 (old2 (match-string 4))
1203 (new1 (number-to-string (+ space minus)))
1204 (new2 (number-to-string (+ space plus))))
1205 (if old2
1206 (unless (string= new2 old2) (replace-match new2 t t nil 4))
1207 (goto-char (match-end 3))
1208 (insert "," new2))
1209 (if old1
1210 (unless (string= new1 old1) (replace-match new1 t t nil 2))
1211 (goto-char (match-end 1))
1212 (insert "," new1))))
1213 ((looking-at diff-context-mid-hunk-header-re)
1214 (when (> (+ space bang plus) 0)
1215 (let* ((old1 (match-string 1))
1216 (old2 (match-string 2))
1217 (new (number-to-string
1218 (+ space bang plus -1 (string-to-number old1)))))
1219 (unless (string= new old2) (replace-match new t t nil 2)))))
1221 (when (> (+ space bang minus) 0)
1222 (let* ((old (match-string 1))
1223 (new (format
1224 (concat "%0" (number-to-string (length old)) "d")
1225 (+ space bang minus -1 (string-to-number old)))))
1226 (unless (string= new old) (replace-match new t t nil 2))))))
1227 (setq space 0 plus 0 minus 0 bang 0)))))))
1229 ;;;;
1230 ;;;; Hooks
1231 ;;;;
1233 (defun diff-write-contents-hooks ()
1234 "Fixup hunk headers if necessary."
1235 (if (buffer-modified-p) (diff-fixup-modifs (point-min) (point-max)))
1236 nil)
1238 ;; It turns out that making changes in the buffer from within an
1239 ;; *-change-function is asking for trouble, whereas making them
1240 ;; from a post-command-hook doesn't pose much problems
1241 (defvar diff-unhandled-changes nil)
1242 (defun diff-after-change-function (beg end _len)
1243 "Remember to fixup the hunk header.
1244 See `after-change-functions' for the meaning of BEG, END and LEN."
1245 ;; Ignoring changes when inhibit-read-only is set is strictly speaking
1246 ;; incorrect, but it turns out that inhibit-read-only is normally not set
1247 ;; inside editing commands, while it tends to be set when the buffer gets
1248 ;; updated by an async process or by a conversion function, both of which
1249 ;; would rather not be uselessly slowed down by this hook.
1250 (when (and (not undo-in-progress) (not inhibit-read-only))
1251 (if diff-unhandled-changes
1252 (setq diff-unhandled-changes
1253 (cons (min beg (car diff-unhandled-changes))
1254 (max end (cdr diff-unhandled-changes))))
1255 (setq diff-unhandled-changes (cons beg end)))))
1257 (defun diff-post-command-hook ()
1258 "Fixup hunk headers if necessary."
1259 (when (consp diff-unhandled-changes)
1260 (ignore-errors
1261 (save-excursion
1262 (goto-char (car diff-unhandled-changes))
1263 ;; Maybe we've cut the end of the hunk before point.
1264 (if (and (bolp) (not (bobp))) (backward-char 1))
1265 ;; We used to fixup modifs on all the changes, but it turns out that
1266 ;; it's safer not to do it on big changes, e.g. when yanking a big
1267 ;; diff, or when the user edits the header, since we might then
1268 ;; screw up perfectly correct values. --Stef
1269 (diff-beginning-of-hunk)
1271 (start (line-beginning-position (if (eq style 'context) 3 2)))
1272 (mid (if (eq style 'context)
1273 (save-excursion
1274 (re-search-forward diff-context-mid-hunk-header-re
1275 nil t)))))
1276 (when (and ;; Don't try to fixup changes in the hunk header.
1277 (> (car diff-unhandled-changes) start)
1278 ;; Don't try to fixup changes in the mid-hunk header either.
1279 (or (not mid)
1280 (< (cdr diff-unhandled-changes) (match-beginning 0))
1281 (> (car diff-unhandled-changes) (match-end 0)))
1282 (save-excursion
1283 (diff-end-of-hunk nil 'donttrustheader)
1284 ;; Don't try to fixup changes past the end of the hunk.
1285 (>= (point) (cdr diff-unhandled-changes))))
1286 (diff-fixup-modifs (point) (cdr diff-unhandled-changes)))))
1287 (setq diff-unhandled-changes nil))))
1289 (defun diff-next-error (arg reset)
1290 ;; Select a window that displays the current buffer so that point
1291 ;; movements are reflected in that window. Otherwise, the user might
1292 ;; never see the hunk corresponding to the source she's jumping to.
1293 (pop-to-buffer (current-buffer))
1294 (if reset (goto-char (point-min)))
1295 (diff-hunk-next arg)
1296 (diff-goto-source))
1298 (defvar whitespace-style)
1299 (defvar whitespace-trailing-regexp)
1301 ;;;###autoload
1302 (define-derived-mode diff-mode fundamental-mode "Diff"
1303 "Major mode for viewing/editing context diffs.
1304 Supports unified and context diffs as well as (to a lesser extent)
1305 normal diffs.
1307 When the buffer is read-only, the ESC prefix is not necessary.
1308 If you edit the buffer manually, diff-mode will try to update the hunk
1309 headers for you on-the-fly.
1317 (set (make-local-variable 'font-lock-defaults) diff-font-lock-defaults)
1318 (set (make-local-variable 'outline-regexp) diff-outline-regexp)
1319 (set (make-local-variable 'imenu-generic-expression)
1320 diff-imenu-generic-expression)
1321 ;; These are not perfect. They would be better done separately for
1322 ;; context diffs and unidiffs.
1323 ;; (set (make-local-variable 'paragraph-start)
1324 ;; (concat "@@ " ; unidiff hunk
1327 ;; ; start (first or second line)
1328 ;; (set (make-local-variable 'paragraph-separate) paragraph-start)
1330 ;; compile support
1331 (set (make-local-variable 'next-error-function) 'diff-next-error)
1333 (set (make-local-variable 'beginning-of-defun-function)
1334 'diff-beginning-of-file-and-junk)
1335 (set (make-local-variable 'end-of-defun-function)
1336 'diff-end-of-file)
1338 (diff-setup-whitespace)
1340 (setq buffer-read-only diff-default-read-only)
1341 ;; setup change hooks
1342 (if (not diff-update-on-the-fly)
1343 (add-hook 'write-contents-functions 'diff-write-contents-hooks nil t)
1344 (make-local-variable 'diff-unhandled-changes)
1345 (add-hook 'after-change-functions 'diff-after-change-function nil t)
1346 (add-hook 'post-command-hook 'diff-post-command-hook nil t))
1347 ;; Neat trick from Dave Love to add more bindings in read-only mode:
1348 (let ((ro-bind (cons 'buffer-read-only diff-mode-shared-map)))
1349 (add-to-list 'minor-mode-overriding-map-alist ro-bind)
1350 ;; Turn off this little trick in case the buffer is put in view-mode.
1351 (add-hook 'view-mode-hook
1352 (lambda ()
1353 (setq minor-mode-overriding-map-alist
1354 (delq ro-bind minor-mode-overriding-map-alist)))
1355 nil t))
1356 ;; add-log support
1357 (set (make-local-variable 'add-log-current-defun-function)
1358 'diff-current-defun)
1359 (set (make-local-variable 'add-log-buffer-file-name-function)
1360 (lambda () (diff-find-file-name nil 'noprompt)))
1361 (unless (buffer-file-name)
1362 (hack-dir-local-variables-non-file-buffer)))
1364 ;;;###autoload
1365 (define-minor-mode diff-minor-mode
1366 "Toggle Diff minor mode.
1367 With a prefix argument ARG, enable Diff minor mode if ARG is
1368 positive, and disable it otherwise. If called from Lisp, enable
1369 the mode if ARG is omitted or nil.
1372 :group 'diff-mode :lighter " Diff"
1373 ;; FIXME: setup font-lock
1374 ;; setup change hooks
1375 (if (not diff-update-on-the-fly)
1376 (add-hook 'write-contents-functions 'diff-write-contents-hooks nil t)
1377 (make-local-variable 'diff-unhandled-changes)
1378 (add-hook 'after-change-functions 'diff-after-change-function nil t)
1379 (add-hook 'post-command-hook 'diff-post-command-hook nil t)))
1381 ;;; Handy hook functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1383 (defun diff-setup-whitespace ()
1384 "Set up Whitespace mode variables for the current Diff mode buffer.
1385 This sets `whitespace-style' and `whitespace-trailing-regexp' so
1386 that Whitespace mode shows trailing whitespace problems on the
1387 modified lines of the diff."
1388 (set (make-local-variable 'whitespace-style) '(face trailing))
1389 (let ((style (save-excursion
1390 (goto-char (point-min))
1391 (when (re-search-forward diff-hunk-header-re nil t)
1392 (goto-char (match-beginning 0))
1393 (diff-hunk-style)))))
1394 (set (make-local-variable 'whitespace-trailing-regexp)
1395 (if (eq style 'context)
1399 (defun diff-delete-if-empty ()
1400 ;; An empty diff file means there's no more diffs to integrate, so we
1401 ;; can just remove the file altogether. Very handy for .rej files if we
1402 ;; remove hunks as we apply them.
1403 (when (and buffer-file-name
1404 (eq 0 (nth 7 (file-attributes buffer-file-name))))
1405 (delete-file buffer-file-name)))
1407 (defun diff-delete-empty-files ()
1408 "Arrange for empty diff files to be removed."
1409 (add-hook 'after-save-hook 'diff-delete-if-empty nil t))
1411 (defun diff-make-unified ()
1412 "Turn context diffs into unified diffs if applicable."
1413 (if (save-excursion
1414 (goto-char (point-min))
1415 (and (looking-at diff-hunk-header-re) (eq (char-after) ?*)))
1416 (let ((mod (buffer-modified-p)))
1417 (unwind-protect
1418 (diff-context->unified (point-min) (point-max))
1419 (restore-buffer-modified-p mod)))))
1421 ;;;
1422 ;;; Misc operations that have proved useful at some point.
1423 ;;;
1425 (defun diff-next-complex-hunk ()
1428 Only works for unified diffs."
1429 (interactive)
1430 (while
1431 (and (re-search-forward diff-hunk-header-re-unified nil t)
1432 (equal (match-string 2) (match-string 4)))))
1434 (defun diff-sanity-check-context-hunk-half (lines)
1435 (let ((count lines))
1436 (while
1437 (cond
1438 ((and (memq (char-after) '(?\s ?! ?+ ?-))
1440 (cl-decf count) t)
1441 ((or (zerop count) (= count lines)) nil)
1442 ((memq (char-after) '(?! ?+ ?-))
1444 (y-or-n-p "Try to auto-fix whitespace loss damage? ")))
1445 (error "End of hunk ambiguously marked")
1446 (forward-char 1) (insert " ") (forward-line -1) t))
1447 ((< lines 0)
1448 (error "End of hunk ambiguously marked"))
1449 ((not (y-or-n-p "Try to auto-fix whitespace loss and word-wrap damage? "))
1450 (error "Abort!"))
1451 ((eolp) (insert " ") (forward-line -1) t)
1452 (t (insert " ") (delete-region (- (point) 2) (- (point) 1)) t))
1453 (forward-line))))
1455 (defun diff-sanity-check-hunk ()
1456 (let (;; Every modification is protected by a y-or-n-p, so it's probably
1457 ;; OK to override a read-only setting.
1458 (inhibit-read-only t))
1459 (save-excursion
1460 (cond
1461 ((not (looking-at diff-hunk-header-re))
1462 (error "Not recognizable hunk header"))
1464 ;; A context diff.
1465 ((eq (char-after) ?*)
1466 (if (not (looking-at "\\*\\{15\\}\\(?: .*\\)?\n\\*\\*\\* \\([0-9]+\\)\\(?:,\\([0-9]+\\)\\)? \\*\\*\\*\\*"))
1467 (error "Unrecognized context diff first hunk header format")
1468 (forward-line 2)
1469 (diff-sanity-check-context-hunk-half
1470 (if (match-end 2)
1471 (1+ (- (string-to-number (match-string 2))
1472 (string-to-number (match-string 1))))
1473 1))
1474 (if (not (looking-at diff-context-mid-hunk-header-re))
1475 (error "Unrecognized context diff second hunk header format")
1476 (forward-line)
1477 (diff-sanity-check-context-hunk-half
1478 (if (match-end 2)
1479 (1+ (- (string-to-number (match-string 2))
1480 (string-to-number (match-string 1))))
1481 1)))))
1483 ;; A unified diff.
1484 ((eq (char-after) ?@)
1485 (if (not (looking-at diff-hunk-header-re-unified))
1486 (error "Unrecognized unified diff hunk header format")
1487 (let ((before (string-to-number (or (match-string 2) "1")))
1488 (after (string-to-number (or (match-string 4) "1"))))
1489 (forward-line)
1490 (while
1491 (pcase (char-after)
1492 (?\s (cl-decf before) (cl-decf after) t)
1493 (?-
1494 (if (and (looking-at diff-file-header-re)
1495 (zerop before) (zerop after))
1496 ;; No need to query: this is a case where two patches
1497 ;; are concatenated and only counting the lines will
1498 ;; give the right result. Let's just add an empty
1499 ;; line so that our code which doesn't count lines
1500 ;; will not get confused.
1502 (cl-decf before) t))
1503 (?+ (cl-decf after) t)
1504 (_
1505 (cond
1506 ((and diff-valid-unified-empty-line
1507 ;; Not just (eolp) so we don't infloop at eob.
1509 (> before 0) (> after 0))
1510 (cl-decf before) (cl-decf after) t)
1511 ((and (zerop before) (zerop after)) nil)
1512 ((or (< before 0) (< after 0))
1513 (error (if (or (zerop before) (zerop after))
1514 "End of hunk ambiguously marked"
1515 "Hunk seriously messed up")))
1516 ((not (y-or-n-p (concat "Try to auto-fix " (if (eolp) "whitespace loss" "word-wrap damage") "? ")))
1517 (error "Abort!"))
1518 ((eolp) (insert " ") (forward-line -1) t)
1519 (t (insert " ")
1520 (delete-region (- (point) 2) (- (point) 1)) t))))
1521 (forward-line)))))
1523 ;; A plain diff.
1524 (t
1525 ;; TODO.
1526 )))))
1528 (defun diff-hunk-text (hunk destp char-offset)
1529 "Return the literal source text from HUNK as (TEXT . OFFSET).
1530 If DESTP is nil, TEXT is the source, otherwise the destination text.
1531 CHAR-OFFSET is a char-offset in HUNK, and OFFSET is the corresponding
1532 char-offset in TEXT."
1533 (with-temp-buffer
1534 (insert hunk)
1535 (goto-char (point-min))
1536 (let ((src-pos nil)
1537 (dst-pos nil)
1538 (divider-pos nil)
1539 (num-pfx-chars 2))
1540 ;; Set the following variables:
1541 ;; SRC-POS buffer pos of the source part of the hunk or nil if none
1542 ;; DST-POS buffer pos of the destination part of the hunk or nil
1543 ;; DIVIDER-POS buffer pos of any divider line separating the src & dst
1544 ;; NUM-PFX-CHARS number of line-prefix characters used by this format"
1545 (cond ((looking-at "^@@")
1546 ;; unified diff
1547 (setq num-pfx-chars 1)
1548 (forward-line 1)
1549 (setq src-pos (point) dst-pos (point)))
1551 ;; context diff
1552 (forward-line 2)
1553 (setq src-pos (point))
1554 (re-search-forward diff-context-mid-hunk-header-re nil t)
1555 (forward-line 0)
1556 (setq divider-pos (point))
1557 (forward-line 1)
1558 (setq dst-pos (point)))
1559 ((looking-at "^[0-9]+a[0-9,]+$")
1560 ;; normal diff, insert
1561 (forward-line 1)
1562 (setq dst-pos (point)))
1563 ((looking-at "^[0-9,]+d[0-9]+$")
1564 ;; normal diff, delete
1565 (forward-line 1)
1566 (setq src-pos (point)))
1567 ((looking-at "^[0-9,]+c[0-9,]+$")
1568 ;; normal diff, change
1569 (forward-line 1)
1570 (setq src-pos (point))
1571 (re-search-forward "^---$" nil t)
1572 (forward-line 0)
1573 (setq divider-pos (point))
1574 (forward-line 1)
1575 (setq dst-pos (point)))
1576 (t
1577 (error "Unknown diff hunk type")))
1579 (if (if destp (null dst-pos) (null src-pos))
1580 ;; Implied empty text
1581 (if char-offset '("" . 0) "")
1583 ;; For context diffs, either side can be empty, (if there's only
1584 ;; added or only removed text). We should then use the other side.
1585 (cond ((equal src-pos divider-pos) (setq src-pos dst-pos))
1586 ((equal dst-pos (point-max)) (setq dst-pos src-pos)))
1588 (when char-offset (goto-char (+ (point-min) char-offset)))
1590 ;; Get rid of anything except the desired text.
1591 (save-excursion
1592 ;; Delete unused text region
1593 (let ((keep (if destp dst-pos src-pos)))
1594 (when (and divider-pos (> divider-pos keep))
1595 (delete-region divider-pos (point-max)))
1596 (delete-region (point-min) keep))
1597 ;; Remove line-prefix characters, and unneeded lines (unified diffs).
1598 (let ((kill-char (if destp ?- ?+)))
1599 (goto-char (point-min))
1600 (while (not (eobp))
1601 (if (eq (char-after) kill-char)
1602 (delete-region (point) (progn (forward-line 1) (point)))
1603 (delete-char num-pfx-chars)
1604 (forward-line 1)))))
1606 (let ((text (buffer-substring-no-properties (point-min) (point-max))))
1607 (if char-offset (cons text (- (point) (point-min))) text))))))
1610 (defun diff-find-text (text)
1611 "Return the buffer position (BEG . END) of the nearest occurrence of TEXT.
1612 If TEXT isn't found, nil is returned."
1613 (let* ((orig (point))
1614 (forw (and (search-forward text nil t)
1615 (cons (match-beginning 0) (match-end 0))))
1616 (back (and (goto-char (+ orig (length text)))
1617 (search-backward text nil t)
1618 (cons (match-beginning 0) (match-end 0)))))
1619 ;; Choose the closest match.
1620 (if (and forw back)
1621 (if (> (- (car forw) orig) (- orig (car back))) back forw)
1622 (or back forw))))
1624 (defun diff-find-approx-text (text)
1625 "Return the buffer position (BEG . END) of the nearest occurrence of TEXT.
1626 Whitespace differences are ignored."
1627 (let* ((orig (point))
1631 (forw (and (re-search-forward re nil t)
1632 (cons (match-beginning 0) (match-end 0))))
1633 (back (and (goto-char (+ orig (length text)))
1634 (re-search-backward re nil t)
1635 (cons (match-beginning 0) (match-end 0)))))
1636 ;; Choose the closest match.
1637 (if (and forw back)
1638 (if (> (- (car forw) orig) (- orig (car back))) back forw)
1639 (or back forw))))
1641 (defsubst diff-xor (a b) (if a (if (not b) a) b))
1643 (defun diff-find-source-location (&optional other-file reverse noprompt)
1644 "Find out (BUF LINE-OFFSET POS SRC DST SWITCHED).
1645 BUF is the buffer corresponding to the source file.
1646 LINE-OFFSET is the offset between the expected and actual positions
1647 of the text of the hunk or nil if the text was not found.
1648 POS is a pair (BEG . END) indicating the position of the text in the buffer.
1649 SRC and DST are the two variants of text as returned by `diff-hunk-text'.
1650 SRC is the variant that was found in the buffer.
1651 SWITCHED is non-nil if the patch is already applied.
1652 NOPROMPT, if non-nil, means not to prompt the user."
1653 (save-excursion
1654 (let* ((other (diff-xor other-file diff-jump-to-old-file))
1655 (char-offset (- (point) (diff-beginning-of-hunk t)))
1656 ;; Check that the hunk is well-formed. Otherwise diff-mode and
1657 ;; the user may disagree on what constitutes the hunk
1658 ;; (e.g. because an empty line truncates the hunk mid-course),
1659 ;; leading to potentially nasty surprises for the user.
1660 ;;
1661 ;; Suppress check when NOPROMPT is non-nil (Bug#3033).
1662 (_ (unless noprompt (diff-sanity-check-hunk)))
1663 (hunk (buffer-substring
1664 (point) (save-excursion (diff-end-of-hunk) (point))))
1665 (old (diff-hunk-text hunk reverse char-offset))
1666 (new (diff-hunk-text hunk (not reverse) char-offset))
1667 ;; Find the location specification.
1668 (line (if (not (looking-at "\\(?:\\*\\{15\\}.*\n\\)?[-@* ]*\\([0-9,]+\\)\\([ acd+]+\\([0-9,]+\\)\\)?"))
1669 (error "Can't find the hunk header")
1670 (if other (match-string 1)
1671 (if (match-end 3) (match-string 3)
1672 (unless (re-search-forward
1673 diff-context-mid-hunk-header-re nil t)
1674 (error "Can't find the hunk separator"))
1675 (match-string 1)))))
1676 (file (or (diff-find-file-name other noprompt)
1677 (error "Can't find the file")))
1678 (buf (find-file-noselect file)))
1679 ;; Update the user preference if he so wished.
1680 (when (> (prefix-numeric-value other-file) 8)
1681 (setq diff-jump-to-old-file other))
1682 (with-current-buffer buf
1683 (goto-char (point-min)) (forward-line (1- (string-to-number line)))
1684 (let* ((orig-pos (point))
1685 (switched nil)
1686 ;; FIXME: Check for case where both OLD and NEW are found.
1687 (pos (or (diff-find-text (car old))
1688 (progn (setq switched t) (diff-find-text (car new)))
1689 (progn (setq switched nil)
1690 (condition-case nil
1691 (diff-find-approx-text (car old))
1692 (invalid-regexp nil))) ;Regex too big.
1693 (progn (setq switched t)
1694 (condition-case nil
1695 (diff-find-approx-text (car new))
1696 (invalid-regexp nil))) ;Regex too big.
1697 (progn (setq switched nil) nil))))
1698 (nconc
1699 (list buf)
1700 (if pos
1701 (list (count-lines orig-pos (car pos)) pos)
1702 (list nil (cons orig-pos (+ orig-pos (length (car old))))))
1703 (if switched (list new old t) (list old new))))))))
1706 (defun diff-hunk-status-msg (line-offset reversed dry-run)
1707 (let ((msg (if dry-run
1708 (if reversed "already applied" "not yet applied")
1709 (if reversed "undone" "applied"))))
1710 (message (cond ((null line-offset) "Hunk text not found")
1711 ((= line-offset 0) "Hunk %s")
1712 ((= line-offset 1) "Hunk %s at offset %d line")
1713 (t "Hunk %s at offset %d lines"))
1714 msg line-offset)))
1716 (defvar diff-apply-hunk-to-backup-file nil)
1718 (defun diff-apply-hunk (&optional reverse)
1719 "Apply the current hunk to the source file and go to the next.
1720 By default, the new source file is patched, but if the variable
1721 `diff-jump-to-old-file' is non-nil, then the old source file is
1722 patched instead (some commands, such as `diff-goto-source' can change
1723 the value of this variable when given an appropriate prefix argument).
1725 With a prefix argument, REVERSE the hunk."
1726 (interactive "P")
1727 (pcase-let ((`(,buf ,line-offset ,pos ,old ,new ,switched)
1728 ;; Sometimes we'd like to have the following behavior: if
1729 ;; REVERSE go to the new file, otherwise go to the old.
1730 ;; But that means that by default we use the old file, which is
1731 ;; the opposite of the default for diff-goto-source, and is thus
1732 ;; confusing. Also when you don't know about it it's
1733 ;; pretty surprising.
1734 ;; TODO: make it possible to ask explicitly for this behavior.
1735 ;;
1736 ;; This is duplicated in diff-test-hunk.
1737 (diff-find-source-location nil reverse)))
1738 (cond
1739 ((null line-offset)
1740 (error "Can't find the text to patch"))
1741 ((with-current-buffer buf
1742 (and buffer-file-name
1743 (backup-file-name-p buffer-file-name)
1744 (not diff-apply-hunk-to-backup-file)
1745 (not (set (make-local-variable 'diff-apply-hunk-to-backup-file)
1746 (yes-or-no-p (format "Really apply this hunk to %s? "
1747 (file-name-nondirectory
1748 buffer-file-name)))))))
1749 (error "%s"
1750 (substitute-command-keys
1753 ((and switched
1754 ;; A reversed patch was detected, perhaps apply it in reverse.
1755 (not (save-window-excursion
1756 (pop-to-buffer buf)
1757 (goto-char (+ (car pos) (cdr old)))
1758 (y-or-n-p
1759 (if reverse
1760 "Hunk hasn't been applied yet; apply it now? "
1761 "Hunk has already been applied; undo it? ")))))
1762 (message "(Nothing done)"))
1763 (t
1764 ;; Apply the hunk
1765 (with-current-buffer buf
1766 (goto-char (car pos))
1767 (delete-region (car pos) (cdr pos))
1768 (insert (car new)))
1769 ;; Display BUF in a window
1770 (set-window-point (display-buffer buf) (+ (car pos) (cdr new)))
1771 (diff-hunk-status-msg line-offset (diff-xor switched reverse) nil)
1772 (when diff-advance-after-apply-hunk
1773 (diff-hunk-next))))))
1776 (defun diff-test-hunk (&optional reverse)
1777 "See whether it's possible to apply the current hunk.
1778 With a prefix argument, try to REVERSE the hunk."
1779 (interactive "P")
1780 (pcase-let ((`(,buf ,line-offset ,pos ,src ,_dst ,switched)
1781 (diff-find-source-location nil reverse)))
1782 (set-window-point (display-buffer buf) (+ (car pos) (cdr src)))
1783 (diff-hunk-status-msg line-offset (diff-xor reverse switched) t)))
1786 (defalias 'diff-mouse-goto-source 'diff-goto-source)
1788 (defun diff-goto-source (&optional other-file event)
1789 "Jump to the corresponding source line.
1790 `diff-jump-to-old-file' (or its opposite if the OTHER-FILE prefix arg
1791 is given) determines whether to jump to the old or the new file.
1792 If the prefix arg is bigger than 8 (for example with \\[universal-argument] \\[universal-argument])
1793 then `diff-jump-to-old-file' is also set, for the next invocations."
1794 (interactive (list current-prefix-arg last-input-event))
1795 ;; When pointing at a removal line, we probably want to jump to
1796 ;; the old location, and else to the new (i.e. as if reverting).
1797 ;; This is a convenient detail when using smerge-diff.
1798 (if event (posn-set-point (event-end event)))
1799 (let ((rev (not (save-excursion (beginning-of-line) (looking-at "[-<]")))))
1800 (pcase-let ((`(,buf ,line-offset ,pos ,src ,_dst ,switched)
1801 (diff-find-source-location other-file rev)))
1802 (pop-to-buffer buf)
1803 (goto-char (+ (car pos) (cdr src)))
1804 (diff-hunk-status-msg line-offset (diff-xor rev switched) t))))
1807 (defun diff-current-defun ()
1808 "Find the name of function at point.
1809 For use in `add-log-current-defun-function'."
1810 ;; Kill change-log-default-name so it gets recomputed each time, since
1811 ;; each hunk may belong to another file which may belong to another
1812 ;; directory and hence have a different ChangeLog file.
1813 (kill-local-variable 'change-log-default-name)
1814 (save-excursion
1815 (when (looking-at diff-hunk-header-re)
1816 (forward-line 1)
1817 (re-search-forward "^[^ ]" nil t))
1818 (pcase-let ((`(,buf ,_line-offset ,pos ,src ,dst ,switched)
1819 (ignore-errors ;Signals errors in place of prompting.
1820 ;; Use `noprompt' since this is used in which-func-mode
1821 ;; and such.
1822 (diff-find-source-location nil nil 'noprompt))))
1823 (when buf
1824 (beginning-of-line)
1825 (or (when (memq (char-after) '(?< ?-))
1826 ;; Cursor is pointing at removed text. This could be a removed
1827 ;; function, in which case, going to the source buffer will
1828 ;; not help since the function is now removed. Instead,
1829 ;; try to figure out the function name just from the
1830 ;; code-fragment.
1831 (let ((old (if switched dst src)))
1832 (with-temp-buffer
1833 (insert (car old))
1834 (funcall (buffer-local-value 'major-mode buf))
1835 (goto-char (+ (point-min) (cdr old)))
1836 (add-log-current-defun))))
1837 (with-current-buffer buf
1838 (goto-char (+ (car pos) (cdr src)))
1839 (add-log-current-defun)))))))
1841 (defun diff-ignore-whitespace-hunk ()
1842 "Re-diff the current hunk, ignoring whitespace differences."
1843 (interactive)
1844 (let* ((char-offset (- (point) (diff-beginning-of-hunk t)))
1845 (opts (pcase (char-after) (?@ "-bu") (?* "-bc") (_ "-b")))
1847 (error "Can't find line number"))
1848 (string-to-number (match-string 1))))
1849 (inhibit-read-only t)
1850 (hunk (delete-and-extract-region
1851 (point) (save-excursion (diff-end-of-hunk) (point))))
1853 (file1 (make-temp-file "diff1"))
1854 (file2 (make-temp-file "diff2"))
1855 (coding-system-for-read buffer-file-coding-system)
1856 old new)
1857 (unwind-protect
1858 (save-excursion
1859 (setq old (diff-hunk-text hunk nil char-offset))
1860 (setq new (diff-hunk-text hunk t char-offset))
1861 (write-region (concat lead (car old)) nil file1 nil 'nomessage)
1862 (write-region (concat lead (car new)) nil file2 nil 'nomessage)
1863 (with-temp-buffer
1864 (let ((status
1865 (call-process diff-command nil t nil
1866 opts file1 file2)))
1867 (pcase status
1868 (0 nil) ;Nothing to reformat.
1869 (1 (goto-char (point-min))
1870 ;; Remove the file-header.
1871 (when (re-search-forward diff-hunk-header-re nil t)
1872 (delete-region (point-min) (match-beginning 0))))
1873 (_ (goto-char (point-max))
1875 (insert hunk)))
1876 (setq hunk (buffer-string))
1877 (unless (memq status '(0 1))
1878 (error "Diff returned: %s" status)))))
1879 ;; Whatever happens, put back some equivalent text: either the new
1880 ;; one or the original one in case some error happened.
1881 (insert hunk)
1882 (delete-file file1)
1883 (delete-file file2))))
1885 ;;; Fine change highlighting.
1887 (defface diff-refine-change
1888 '((((class color) (min-colors 88) (background light))
1889 :background "#ffff55")
1890 (((class color) (min-colors 88) (background dark))
1891 :background "#aaaa22")
1892 (t :inverse-video t))
1893 "Face used for char-based changes shown by `diff-refine-hunk'."
1894 :group 'diff-mode)
1896 (defface diff-refine-removed
1897 '((default
1898 :inherit diff-refine-change)
1899 (((class color) (min-colors 88) (background light))
1900 :background "#ffaaaa")
1901 (((class color) (min-colors 88) (background dark))
1902 :background "#aa2222"))
1903 "Face used for removed characters shown by `diff-refine-hunk'."
1904 :group 'diff-mode
1905 :version "24.2")
1907 (defface diff-refine-added
1908 '((default
1909 :inherit diff-refine-change)
1910 (((class color) (min-colors 88) (background light))
1911 :background "#aaffaa")
1912 (((class color) (min-colors 88) (background dark))
1913 :background "#22aa22"))
1914 "Face used for added characters shown by `diff-refine-hunk'."
1915 :group 'diff-mode
1916 :version "24.2")
1918 (defun diff-refine-preproc ()
1919 (while (re-search-forward "^[+>]" nil t)
1920 ;; Remove spurious changes due to the fact that one side of the hunk is
1921 ;; marked with leading + or > and the other with leading - or <.
1922 ;; We used to replace all the prefix chars with " " but this only worked
1923 ;; when we did char-based refinement (or when using
1924 ;; smerge-refine-weight-hack) since otherwise, the `forward' motion done
1925 ;; in chopup do not necessarily do the same as the ones in highlight
1926 ;; since the "_" is not treated the same as " ".
1927 (replace-match (cdr (assq (char-before) '((?+ . "-") (?> . "<"))))))
1928 )
1930 (declare-function smerge-refine-subst "smerge-mode"
1931 (beg1 end1 beg2 end2 props-c &optional preproc props-r props-a))
1933 (defun diff-refine-hunk ()
1934 "Highlight changes of hunk at point at a finer granularity."
1935 (interactive)
1936 (require 'smerge-mode)
1937 (save-excursion
1938 (diff-beginning-of-hunk t)
1939 (let* ((start (point))
1940 (style (diff-hunk-style)) ;Skips the hunk header as well.
1941 (beg (point))
1942 (props-c '((diff-mode . fine) (face diff-refine-change)))
1943 (props-r '((diff-mode . fine) (face diff-refine-removed)))
1944 (props-a '((diff-mode . fine) (face diff-refine-added)))
1945 ;; Be careful to go back to `start' so diff-end-of-hunk gets
1946 ;; to read the hunk header's line info.
1947 (end (progn (goto-char start) (diff-end-of-hunk) (point))))
1949 (remove-overlays beg end 'diff-mode 'fine)
1951 (goto-char beg)
1952 (pcase style
1953 (`unified
1955 end t)
1956 (smerge-refine-subst (match-beginning 0) (match-end 1)
1957 (match-end 1) (match-end 0)
1958 nil 'diff-refine-preproc props-r props-a)))
1959 (`context
1960 (let* ((middle (save-excursion (re-search-forward "^---")))
1961 (other middle))
1963 (smerge-refine-subst (match-beginning 0) (match-end 0)
1964 (save-excursion
1965 (goto-char other)
1967 (setq other (match-end 0))
1968 (match-beginning 0))
1969 other
1970 (if diff-use-changed-face props-c)
1971 'diff-refine-preproc
1972 (unless diff-use-changed-face props-r)
1973 (unless diff-use-changed-face props-a)))))
1974 (_ ;; Normal diffs.
1975 (let ((beg1 (1+ (point))))
1977 ;; It's a combined add&remove, so there's something to do.
1978 (smerge-refine-subst beg1 (match-beginning 0)
1979 (match-end 0) end
1980 nil 'diff-refine-preproc props-r props-a))))))))
1982 (defun diff-undo (&optional arg)
1983 "Perform `undo', ignoring the buffer's read-only status."
1984 (interactive "P")
1985 (let ((inhibit-read-only t))
1986 (undo arg)))
1988 (defun diff-add-change-log-entries-other-window ()
1989 "Iterate through the current diff and create ChangeLog entries.
1990 I.e. like `add-change-log-entry-other-window' but applied to all hunks."
1991 (interactive)
1992 ;; XXX: Currently add-change-log-entry-other-window is only called
1993 ;; once per hunk. Some hunks have multiple changes, it would be
1994 ;; good to call it for each change.
1995 (save-excursion
1996 (goto-char (point-min))
1997 (condition-case nil
1998 ;; Call add-change-log-entry-other-window for each hunk in
1999 ;; the diff buffer.
2000 (while (progn
2001 (diff-hunk-next)
2002 ;; Move to where the changes are,
2003 ;; `add-change-log-entry-other-window' works better in
2004 ;; that case.
2005 (re-search-forward
2007 ;; If the hunk is a context hunk with an empty first
2008 ;; half, recognize the "--- NNN,MMM ----" line
2010 ;; and skip to the next non-context line.
2012 nil t))
2013 (save-excursion
2014 ;; FIXME: this pops up windows of all the buffers.
2015 (add-change-log-entry nil nil t nil t)))
2016 ;; When there's no more hunks, diff-hunk-next signals an error.
2017 (error nil))))
2019 ;; provide the package
2020 (provide 'diff-mode)
2022 ;;; Old Change Log from when diff-mode wasn't part of Emacs:
2023 ;; Revision 1.11 1999/10/09 23:38:29 monnier
2024 ;; (diff-mode-load-hook): dropped.
2025 ;; (auto-mode-alist): also catch *.diffs.
2026 ;; (diff-find-file-name, diff-mode): add smarts to find the right file
2027 ;; for *.rej files (that lack any file name indication).
2028 ;;
2029 ;; Revision 1.10 1999/09/30 15:32:11 monnier
2030 ;; added support for "\ No newline at end of file".
2031 ;;
2032 ;; Revision 1.9 1999/09/15 00:01:13 monnier
2033 ;; - added basic `compile' support.
2034 ;; - have diff-kill-hunk call diff-kill-file if it's the only hunk.
2035 ;; - diff-kill-file now tries to kill the leading garbage as well.
2036 ;;
2037 ;; Revision 1.8 1999/09/13 21:10:09 monnier
2038 ;; - don't use CL in the autoloaded code
2039 ;; - accept diffs using -T
2040 ;;
2041 ;; Revision 1.7 1999/09/05 20:53:03 monnier
2042 ;; interface to ediff-patch
2043 ;;
2044 ;; Revision 1.6 1999/09/01 20:55:13 monnier
2045 ;; (ediff=patch-file): add bindings to call ediff-patch.
2046 ;; (diff-find-file-name): taken out of diff-goto-source.
2047 ;; (diff-unified->context, diff-context->unified, diff-reverse-direction,
2048 ;; diff-fixup-modifs): only use the region if a prefix arg is given.
2049 ;;
2050 ;; Revision 1.5 1999/08/31 19:18:52 monnier
2051 ;; (diff-beginning-of-file, diff-prev-file): fixed wrong parenthesis.
2052 ;;
2053 ;; Revision 1.4 1999/08/31 13:01:44 monnier
2054 ;; use `combine-after-change-calls' to minimize the slowdown of font-lock.
2055 ;;
2057 ;;; diff-mode.el ends here