mirrored from git://git.sv.gnu.org/emacs.git
-
Notifications
You must be signed in to change notification settings - Fork 1.3k
/
smerge-mode.el
1485 lines (1369 loc) · 57.7 KB
/
smerge-mode.el
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
;;; smerge-mode.el --- Minor mode to resolve diff3 conflicts -*- lexical-binding: t -*-
;; Copyright (C) 1999-2024 Free Software Foundation, Inc.
;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
;; Keywords: vc, tools, revision control, merge, diff3, cvs, conflict
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Provides a lightweight alternative to emerge/ediff.
;;
;; To use it, simply type `M-x smerge-mode'.
;;
;; You can even have it turned on automatically with the following
;; piece of code in your .emacs:
;;
;; (defun sm-try-smerge ()
;; (save-excursion
;; (goto-char (point-min))
;; (when (re-search-forward "^<<<<<<< " nil t)
;; (smerge-mode 1))))
;; (add-hook 'find-file-hook 'sm-try-smerge t)
;;; Todo:
;; - if requested, ask the user whether he wants to call ediff right away
;;; Code:
(eval-when-compile (require 'cl-lib))
(require 'diff) ;For diff-check-labels.
(require 'diff-mode) ;For diff-refine.
(require 'newcomment)
(require 'easy-mmode)
;;; The real definition comes later.
(defvar smerge-mode)
(defgroup smerge ()
"Minor mode to highlight and resolve diff3 conflicts."
:group 'tools
:prefix "smerge-")
(defcustom smerge-diff-buffer-name "*vc-diff*"
"Buffer name to use for displaying diffs."
:type '(choice
(const "*vc-diff*")
(const "*cvs-diff*")
(const "*smerge-diff*")
string))
(defcustom smerge-diff-switches
(append '("-d" "-b")
(if (listp diff-switches) diff-switches (list diff-switches)))
"A list of strings specifying switches to be passed to diff.
Used in `smerge-diff-base-upper' and related functions."
:type '(repeat string))
(defcustom smerge-auto-leave t
"Non-nil means to leave `smerge-mode' when the last conflict is resolved."
:type 'boolean)
(defface smerge-upper
'((((class color) (min-colors 88) (background light))
:background "#ffdddd" :extend t)
(((class color) (min-colors 88) (background dark))
:background "#553333" :extend t)
(((class color))
:foreground "red" :extend))
"Face for the `upper' version of a conflict.")
(define-obsolete-face-alias 'smerge-mine 'smerge-upper "26.1")
(defvar smerge-upper-face 'smerge-upper)
(defface smerge-lower
'((((class color) (min-colors 88) (background light))
:background "#ddffdd" :extend t)
(((class color) (min-colors 88) (background dark))
:background "#335533" :extend t)
(((class color))
:foreground "green" :extend))
"Face for the `lower' version of a conflict.")
(define-obsolete-face-alias 'smerge-other 'smerge-lower "26.1")
(defvar smerge-lower-face 'smerge-lower)
(defface smerge-base
'((((class color) (min-colors 88) (background light))
:background "#ffffaa" :extend t)
(((class color) (min-colors 88) (background dark))
:background "#888833" :extend t)
(((class color))
:foreground "yellow" :extend t))
"Face for the base code.")
(defvar smerge-base-face 'smerge-base)
(defface smerge-markers
'((((background light))
(:background "grey85" :extend t))
(((background dark))
(:background "grey30" :extend t)))
"Face for the conflict markers.")
(defvar smerge-markers-face 'smerge-markers)
(defface smerge-refined-changed
'((t nil))
"Face used for char-based changes shown by `smerge-refine'.")
(define-obsolete-face-alias 'smerge-refined-change 'smerge-refined-changed "24.5")
(defface smerge-refined-removed
'((default
:inherit smerge-refined-change)
(((class color) (min-colors 88) (background light))
:background "#ffbbbb")
(((class color) (min-colors 88) (background dark))
:background "#aa2222")
(t :inverse-video t))
"Face used for removed characters shown by `smerge-refine'."
:version "24.3")
(defface smerge-refined-added
'((default
:inherit smerge-refined-change)
(((class color) (min-colors 88) (background light))
:background "#aaffaa")
(((class color) (min-colors 88) (background dark))
:background "#22aa22")
(t :inverse-video t))
"Face used for added characters shown by `smerge-refine'."
:version "24.3")
(defvar-keymap smerge-basic-map
"n" #'smerge-next
"p" #'smerge-prev
"r" #'smerge-resolve
"a" #'smerge-keep-all
"b" #'smerge-keep-base
"o" #'smerge-keep-lower ; for the obsolete keep-other
"l" #'smerge-keep-lower
"m" #'smerge-keep-upper ; for the obsolete keep-mine
"u" #'smerge-keep-upper
"E" #'smerge-ediff
"C" #'smerge-combine-with-next
"R" #'smerge-refine
"C-m" #'smerge-keep-current
"=" (define-keymap :name "Diff"
"<" (cons "base-upper" #'smerge-diff-base-upper)
">" (cons "base-lower" #'smerge-diff-base-lower)
"=" (cons "upper-lower" #'smerge-diff-upper-lower)))
(defcustom smerge-command-prefix "\C-c^"
"Prefix for `smerge-mode' commands."
:type '(choice (const :tag "ESC" "\e")
(const :tag "C-c ^" "\C-c^")
(const :tag "none" "")
string))
(defvar-keymap smerge-mode-map
(key-description smerge-command-prefix) smerge-basic-map)
(defvar-local smerge-check-cache nil)
(defun smerge-check (n)
(condition-case nil
(let ((state (cons (point) (buffer-modified-tick))))
(unless (equal (cdr smerge-check-cache) state)
(smerge-match-conflict)
(setq smerge-check-cache (cons (match-data) state)))
(nth (* 2 n) (car smerge-check-cache)))
(error nil)))
(easy-menu-define smerge-mode-menu smerge-mode-map
"Menu for `smerge-mode'."
'("SMerge"
["Next" smerge-next :help "Go to next conflict"]
["Previous" smerge-prev :help "Go to previous conflict"]
"--"
["Keep All" smerge-keep-all :help "Keep all three versions"
:active (smerge-check 1)]
["Keep Current" smerge-keep-current :help "Use current (at point) version"
:active (and (smerge-check 1) (> (smerge-get-current) 0))]
"--"
["Revert to Base" smerge-keep-base :help "Revert to base version"
:active (smerge-check 2)]
["Keep Upper" smerge-keep-upper :help "Keep `upper' version"
:active (smerge-check 1)]
["Keep Lower" smerge-keep-lower :help "Keep `lower' version"
:active (smerge-check 3)]
"--"
["Diff Base/Upper" smerge-diff-base-upper
:help "Diff `base' and `upper' for current conflict"
:active (smerge-check 2)]
["Diff Base/Lower" smerge-diff-base-lower
:help "Diff `base' and `lower' for current conflict"
:active (smerge-check 2)]
["Diff Upper/Lower" smerge-diff-upper-lower
:help "Diff `upper' and `lower' for current conflict"
:active (smerge-check 1)]
"--"
["Invoke Ediff" smerge-ediff
:help "Use Ediff to resolve the conflicts"
:active (smerge-check 1)]
["Refine" smerge-refine
:help "Highlight different words of the conflict"
:active (smerge-check 1)]
["Auto Resolve" smerge-resolve
:help "Try auto-resolution heuristics"
:active (smerge-check 1)]
["Combine" smerge-combine-with-next
:help "Combine current conflict with next"
:active (smerge-check 1)]
))
(easy-menu-define smerge-context-menu nil
"Context menu for upper area in `smerge-mode'."
'(nil
["Keep Current" smerge-keep-current :help "Use current (at point) version"]
["Kill Current" smerge-kill-current :help "Remove current (at point) version"]
["Keep All" smerge-keep-all :help "Keep all three versions"]
"---"
["More..." (popup-menu smerge-mode-menu) :help "Show full SMerge mode menu"]
))
(defconst smerge-font-lock-keywords
'((smerge-find-conflict
(1 smerge-upper-face prepend t)
(2 smerge-base-face prepend t)
(3 smerge-lower-face prepend t)
;; FIXME: `keep' doesn't work right with syntactic fontification.
(0 smerge-markers-face keep)
(4 nil t t)
(5 nil t t)))
"Font lock patterns for `smerge-mode'.")
(defconst smerge-begin-re "^<<<<<<< \\(.*\\)\n")
(defconst smerge-end-re "^>>>>>>> \\(.*\\)\n")
(defconst smerge-base-re "^||||||| \\(.*\\)\n")
(defconst smerge-lower-re "^=======\n")
(defvar smerge-conflict-style nil
"Keep track of which style of conflict is in use.
Can be nil if the style is undecided, or else:
- `diff3-E'
- `diff3-A'")
;;;;
;;;; Actual code
;;;;
;; Define smerge-next and smerge-prev
(easy-mmode-define-navigation smerge smerge-begin-re "conflict" nil nil
(if diff-refine
(condition-case nil (smerge-refine) (error nil))))
(defconst smerge-match-names ["conflict" "upper" "base" "lower"])
(defun smerge-ensure-match (n)
(unless (match-end n)
(error "No `%s'" (aref smerge-match-names n))))
(defun smerge-auto-leave ()
(when (and smerge-auto-leave
(save-excursion (goto-char (point-min))
(not (re-search-forward smerge-begin-re nil t))))
(when (and (listp buffer-undo-list) smerge-mode)
(push (list 'apply 'smerge-mode 1) buffer-undo-list))
(smerge-mode -1)))
(defun smerge-keep-all ()
"Concatenate all versions."
(interactive)
(smerge-match-conflict)
(let ((mb2 (or (match-beginning 2) (point-max)))
(me2 (or (match-end 2) (point-min))))
(delete-region (match-end 3) (match-end 0))
(delete-region (max me2 (match-end 1)) (match-beginning 3))
(if (and (match-end 2) (/= (match-end 1) (match-end 3)))
(delete-region (match-end 1) (match-beginning 2)))
(delete-region (match-beginning 0) (min (match-beginning 1) mb2))
(smerge-auto-leave)))
(defun smerge-keep-n (n)
(smerge-remove-props (match-beginning 0) (match-end 0))
;; We used to use replace-match, but that did not preserve markers so well.
(delete-region (match-end n) (match-end 0))
(delete-region (match-beginning 0) (match-beginning n)))
(defun smerge-combine-with-next ()
"Combine the current conflict with the next one."
;; `smerge-auto-combine' relies on the finish position (at the beginning
;; of the closing marker).
(interactive)
(smerge-match-conflict)
(let ((ends nil))
(dolist (i '(3 2 1 0))
(push (if (match-end i) (copy-marker (match-end i) t)) ends))
(setq ends (apply 'vector ends))
(goto-char (aref ends 0))
(if (not (re-search-forward smerge-begin-re nil t))
(error "No next conflict")
(smerge-match-conflict)
(let ((match-data (mapcar (lambda (m) (if m (copy-marker m)))
(match-data))))
;; First copy the in-between text in each alternative.
(dolist (i '(1 2 3))
(when (aref ends i)
(goto-char (aref ends i))
(insert-buffer-substring (current-buffer)
(aref ends 0) (car match-data))))
(delete-region (aref ends 0) (car match-data))
;; Then move the second conflict's alternatives into the first.
(dolist (i '(1 2 3))
(set-match-data match-data)
(when (and (aref ends i) (match-end i))
(goto-char (aref ends i))
(insert-buffer-substring (current-buffer)
(match-beginning i) (match-end i))))
(delete-region (car match-data) (cadr match-data))
;; Free the markers.
(dolist (m match-data) (if m (move-marker m nil)))
(mapc (lambda (m) (if m (move-marker m nil))) ends)))))
(defvar smerge-auto-combine-max-separation 2
"Max number of lines between conflicts that should be combined.")
(defun smerge-auto-combine ()
"Automatically combine conflicts that are near each other."
(interactive)
(save-excursion
(goto-char (point-min))
(while (smerge-find-conflict)
;; 2 is 1 (default) + 1 (the begin markers).
(while (save-excursion
(smerge-find-conflict
(line-beginning-position
(+ 2 smerge-auto-combine-max-separation))))
(forward-line -1) ;Go back inside the conflict.
(smerge-combine-with-next)
(forward-line 1) ;Move past the end of the conflict.
))))
(defvar smerge-resolve-function
(lambda () (user-error "Don't know how to resolve"))
"Mode-specific merge function.
The function is called with zero or one argument (non-nil if the resolution
function should only apply safe heuristics) and with the match data set
according to `smerge-match-conflict'.")
(defvar smerge-text-properties
'(help-echo "merge conflict: mouse-3 shows a menu"
;; mouse-face highlight
keymap (keymap (down-mouse-3 . smerge-popup-context-menu))))
(defun smerge-remove-props (beg end)
(remove-overlays beg end 'smerge 'refine)
(remove-overlays beg end 'smerge 'conflict)
;; Now that we use overlays rather than text-properties, this function
;; does not cause refontification any more. It can be seen very clearly
;; in buffers where jit-lock-contextually is not t, in which case deleting
;; the "<<<<<<< foobar" leading line leaves the rest of the conflict
;; highlighted as if it were still a valid conflict. Note that in many
;; important cases (such as the previous example) we're actually called
;; during font-locking so inhibit-modification-hooks is non-nil, so we
;; can't just modify the buffer and expect font-lock to be triggered as in:
;; (put-text-property beg end 'smerge-force-highlighting nil)
(with-silent-modifications
(remove-text-properties beg end '(fontified nil))))
(defun smerge-popup-context-menu (event)
"Pop up the Smerge mode context menu under mouse."
(interactive "e")
(if (and smerge-mode
(save-excursion (posn-set-point (event-end event)) (smerge-check 1)))
(progn
(posn-set-point (event-end event))
(smerge-match-conflict)
(let ((i (smerge-get-current))
o)
(if (<= i 0)
;; Out of range
(popup-menu smerge-mode-menu)
;; Install overlay.
(setq o (make-overlay (match-beginning i) (match-end i)))
(unwind-protect
(progn
(overlay-put o 'face 'highlight)
(sit-for 0) ;Display the new highlighting.
(popup-menu smerge-context-menu))
;; Delete overlay.
(delete-overlay o)))))
;; There's no conflict at point, the text-props are just obsolete.
(save-excursion
(let ((beg (re-search-backward smerge-end-re nil t))
(end (re-search-forward smerge-begin-re nil t)))
(smerge-remove-props (or beg (point-min)) (or end (point-max)))
(push event unread-command-events)))))
(defun smerge-apply-resolution-patch (buf m0b m0e m3b m3e &optional m2b)
"Replace the conflict with a bunch of subconflicts.
BUF contains a plain diff between match-1 and match-3."
(let ((line 1)
(textbuf (current-buffer))
(name1 (progn (goto-char m0b)
(buffer-substring (+ (point) 8) (line-end-position))))
(name2 (when m2b (goto-char m2b) (forward-line -1)
(buffer-substring (+ (point) 8) (line-end-position))))
(name3 (progn (goto-char m0e) (forward-line -1)
(buffer-substring (+ (point) 8) (line-end-position)))))
(smerge-remove-props m0b m0e)
(delete-region m3e m0e)
(delete-region m0b m3b)
(setq m3b m0b)
(setq m3e (- m3e (- m3b m0b)))
(goto-char m3b)
(with-current-buffer buf
(goto-char (point-min))
(while (not (eobp))
(if (not (looking-at "\\([0-9]+\\)\\(?:,\\([0-9]+\\)\\)?\\([acd]\\)\\([0-9]+\\)\\(?:,\\([0-9]+\\)\\)?$"))
(error "Unexpected patch hunk header: %s"
(buffer-substring (point) (line-end-position)))
(let* ((op (char-after (match-beginning 3)))
(startline (+ (string-to-number (match-string 1))
;; No clue why this is the way it is, but line
;; numbers seem to be off-by-one for `a' ops.
(if (eq op ?a) 1 0)))
(endline (if (eq op ?a) startline
(1+ (if (match-end 2)
(string-to-number (match-string 2))
startline))))
(lines (- endline startline))
(otherlines (cond
((eq op ?d) nil)
((null (match-end 5)) 1)
(t (- (string-to-number (match-string 5))
(string-to-number (match-string 4)) -1))))
othertext)
(forward-line 1) ;Skip header.
(forward-line lines) ;Skip deleted text.
(if (eq op ?c) (forward-line 1)) ;Skip separator.
(setq othertext
(if (null otherlines) ""
(let ((pos (point)))
(dotimes (_i otherlines) (delete-char 2) (forward-line 1))
(buffer-substring pos (point)))))
(with-current-buffer textbuf
(forward-line (- startline line))
(insert "<<<<<<< " name1 "\n" othertext
(if name2 (concat "||||||| " name2 "\n") "")
"=======\n")
(forward-line lines)
(insert ">>>>>>> " name3 "\n")
(setq line endline))))))))
(defconst smerge-resolve--normalize-re "[\n\t][ \t\n]*\\| [ \t\n]+")
(defun smerge-resolve--extract-comment (beg end)
"Extract the text within the comments that span BEG..END."
(save-excursion
(let ((comments ())
combeg)
(goto-char beg)
(while (and (< (point) end)
(setq combeg (comment-search-forward end t)))
(let ((beg (point)))
(goto-char combeg)
(comment-forward 1)
(save-excursion
(comment-enter-backward)
(push " " comments)
(push (buffer-substring-no-properties beg (point)) comments))))
(push " " comments)
(with-temp-buffer
(apply #'insert (nreverse comments))
(goto-char (point-min))
(while (re-search-forward smerge-resolve--normalize-re
nil t)
(replace-match " "))
(buffer-string)))))
(defun smerge-resolve--normalize (beg end)
(replace-regexp-in-string
smerge-resolve--normalize-re " "
(concat " " (buffer-substring-no-properties beg end) " ")))
(defun smerge-resolve (&optional safe)
"Resolve the conflict at point intelligently.
This relies on mode-specific knowledge and thus only works in some
major modes. Uses `smerge-resolve-function' to do the actual work."
(interactive)
(smerge-match-conflict)
(smerge-remove-props (match-beginning 0) (match-end 0))
(let ((md (match-data))
(m0b (match-beginning 0))
(m1b (match-beginning 1))
(m2b (match-beginning 2))
(m3b (match-beginning 3))
(m0e (match-end 0))
(m1e (match-end 1))
(m2e (match-end 2))
(m3e (match-end 3))
(buf (generate-new-buffer " *smerge*"))
m b o
choice)
(unwind-protect
(progn
(cond
;; Trivial diff3 -A non-conflicts.
((and (eq (match-end 1) (match-end 3))
(eq (match-beginning 1) (match-beginning 3)))
(smerge-keep-n 3))
;; Mode-specific conflict resolution.
((condition-case nil
(atomic-change-group
(if safe
(funcall smerge-resolve-function safe)
(funcall smerge-resolve-function))
t)
(error nil))
;; Nothing to do: the resolution function has done it already.
nil)
;; Non-conflict.
((and (eq m1e m3e) (eq m1b m3b))
(set-match-data md) (smerge-keep-n 3))
;; Refine a 2-way conflict using "diff -b".
;; In case of a 3-way conflict with an empty base
;; (i.e. 2 conflicting additions), we do the same, presuming
;; that the 2 additions should be somehow merged rather
;; than concatenated.
((let ((lines (count-lines m3b m3e)))
(setq m (make-temp-file "smm"))
(write-region m1b m1e m nil 'silent)
(setq o (make-temp-file "smo"))
(write-region m3b m3e o nil 'silent)
(not (or (eq m1b m1e) (eq m3b m3e)
(and (not (zerop (call-process diff-command
nil buf nil "-b" o m)))
;; TODO: We don't know how to do the refinement
;; if there's a non-empty ancestor and m1 and m3
;; aren't just plain equal.
m2b (not (eq m2b m2e)))
(with-current-buffer buf
(goto-char (point-min))
;; Make sure there's some refinement.
(looking-at
(concat "1," (number-to-string lines) "c"))))))
(smerge-apply-resolution-patch buf m0b m0e m3b m3e m2b))
;; "Mere whitespace changes" conflicts.
((when m2e
(setq b (make-temp-file "smb"))
(write-region m2b m2e b nil 'silent)
(with-current-buffer buf (erase-buffer))
;; Only minor whitespace changes made locally.
;; BEWARE: pass "-c" 'cause the output is reused in the next test.
(zerop (call-process diff-command nil buf nil "-bc" b m)))
(set-match-data md)
(smerge-keep-n 3))
;; Try "diff -b BASE UPPER | patch LOWER".
((when (and (not safe) m2e b
;; If the BASE is empty, this would just concatenate
;; the two, which is rarely right.
(not (eq m2b m2e)))
;; BEWARE: we're using here the patch of the previous test.
(with-current-buffer buf
(zerop (call-process-region
(point-min) (point-max) "patch" t nil nil
"-r" null-device "--no-backup-if-mismatch"
"-fl" o))))
(save-restriction
(narrow-to-region m0b m0e)
(smerge-remove-props m0b m0e)
(insert-file-contents o nil nil nil t)))
;; Try "diff -b BASE LOWER | patch UPPER".
((when (and (not safe) m2e b
;; If the BASE is empty, this would just concatenate
;; the two, which is rarely right.
(not (eq m2b m2e)))
(write-region m3b m3e o nil 'silent)
(call-process diff-command nil buf nil "-bc" b o)
(with-current-buffer buf
(zerop (call-process-region
(point-min) (point-max) "patch" t nil nil
"-r" null-device "--no-backup-if-mismatch"
"-fl" m))))
(save-restriction
(narrow-to-region m0b m0e)
(smerge-remove-props m0b m0e)
(insert-file-contents m nil nil nil t)))
;; If the conflict is only made of comments, and one of the two
;; changes is only rearranging spaces (e.g. reflowing text) while
;; the other is a real change, drop the space-rearrangement.
((and m2e
(comment-only-p m1b m1e)
(comment-only-p m2b m2e)
(comment-only-p m3b m3e)
(let ((t1 (smerge-resolve--extract-comment m1b m1e))
(t2 (smerge-resolve--extract-comment m2b m2e))
(t3 (smerge-resolve--extract-comment m3b m3e)))
(cond
((and (equal t1 t2) (not (equal t2 t3)))
(setq choice 3))
((and (not (equal t1 t2)) (equal t2 t3))
(setq choice 1)))))
(set-match-data md)
(smerge-keep-n choice))
;; Idem, when the conflict is contained within a single comment.
((save-excursion
(and m2e
(nth 4 (syntax-ppss m0b))
;; If there's a conflict earlier in the file,
;; syntax-ppss is not reliable.
(not (re-search-backward smerge-begin-re nil t))
(progn (goto-char (nth 8 (syntax-ppss m0b)))
(forward-comment 1)
(> (point) m0e))
(let ((t1 (smerge-resolve--normalize m1b m1e))
(t2 (smerge-resolve--normalize m2b m2e))
(t3 (smerge-resolve--normalize m3b m3e)))
(cond
((and (equal t1 t2) (not (equal t2 t3)))
(setq choice 3))
((and (not (equal t1 t2)) (equal t2 t3))
(setq choice 1))))))
(set-match-data md)
(smerge-keep-n choice))
(t
(user-error "Don't know how to resolve"))))
(if (buffer-name buf) (kill-buffer buf))
(if m (delete-file m))
(if b (delete-file b))
(if o (delete-file o))))
(smerge-auto-leave))
(defun smerge-resolve-all ()
"Perform automatic resolution on all conflicts."
(interactive)
(save-excursion
(goto-char (point-min))
(while (re-search-forward smerge-begin-re nil t)
(condition-case nil
(progn
(smerge-match-conflict)
(smerge-resolve 'safe))
(error nil)))))
(defun smerge-batch-resolve ()
;; command-line-args-left is what is left of the command line.
(if (not noninteractive)
(error "`smerge-batch-resolve' is to be used only with -batch"))
(while command-line-args-left
(let ((file (pop command-line-args-left)))
(if (string-match "\\.rej\\'" file)
;; .rej files should never contain diff3 markers, on the other hand,
;; in Arch, .rej files are sometimes used to indicate that the
;; main file has diff3 markers. So you can pass **/*.rej and
;; it will DTRT.
(setq file (substring file 0 (match-beginning 0))))
(message "Resolving conflicts in %s..." file)
(when (file-readable-p file)
(with-current-buffer (find-file-noselect file)
(smerge-resolve-all)
(save-buffer)
(kill-buffer (current-buffer)))))))
(defun smerge-keep-base ()
"Revert to the base version."
(interactive)
(smerge-match-conflict)
(smerge-ensure-match 2)
(smerge-keep-n 2)
(smerge-auto-leave))
(defun smerge-keep-lower ()
"Keep the \"lower\" version of a merge conflict.
In a conflict that looks like:
<<<<<<<
UUU
=======
LLL
>>>>>>>
this keeps \"LLL\"."
(interactive)
(smerge-match-conflict)
;;(smerge-ensure-match 3)
(smerge-keep-n 3)
(smerge-auto-leave))
(define-obsolete-function-alias 'smerge-keep-other 'smerge-keep-lower "26.1")
(defun smerge-keep-upper ()
"Keep the \"upper\" version of a merge conflict.
In a conflict that looks like:
<<<<<<<
UUU
=======
LLL
>>>>>>>
this keeps \"UUU\"."
(interactive)
(smerge-match-conflict)
;;(smerge-ensure-match 1)
(smerge-keep-n 1)
(smerge-auto-leave))
(define-obsolete-function-alias 'smerge-keep-mine 'smerge-keep-upper "26.1")
(defun smerge-get-current ()
(let ((i 3))
(while (or (not (match-end i))
(< (point) (match-beginning i))
(> (point) (match-end i)))
(cl-decf i))
i))
(defun smerge-keep-current ()
"Use the current (under the cursor) version."
(interactive)
(smerge-match-conflict)
(let ((i (smerge-get-current)))
(if (<= i 0) (error "Not inside a version")
(smerge-keep-n i)
(smerge-auto-leave))))
(defun smerge-kill-current ()
"Remove the current (under the cursor) version."
(interactive)
(smerge-match-conflict)
(let ((i (smerge-get-current)))
(if (<= i 0) (error "Not inside a version")
(let ((left nil))
(dolist (n '(3 2 1))
(if (and (match-end n) (/= (match-end n) (match-end i)))
(push n left)))
(if (and (cdr left)
(/= (match-end (car left)) (match-end (cadr left))))
(ding) ;We don't know how to do that.
(smerge-keep-n (car left))
(smerge-auto-leave))))))
(defun smerge-diff-base-upper ()
"Diff `base' and `upper' version in current conflict region."
(interactive)
(smerge-diff 2 1))
(define-obsolete-function-alias 'smerge-diff-base-mine
'smerge-diff-base-upper "26.1")
(defun smerge-diff-base-lower ()
"Diff `base' and `lower' version in current conflict region."
(interactive)
(smerge-diff 2 3))
(define-obsolete-function-alias 'smerge-diff-base-other
'smerge-diff-base-lower "26.1")
(defun smerge-diff-upper-lower ()
"Diff `upper' and `lower' version in current conflict region."
(interactive)
(smerge-diff 1 3))
(define-obsolete-function-alias 'smerge-diff-mine-other
'smerge-diff-upper-lower "26.1")
(defun smerge-match-conflict ()
"Get info about the conflict. Puts the info in the `match-data'.
The submatches contain:
0: the whole conflict.
1: upper version of the code.
2: base version of the code.
3: lower version of the code.
An error is raised if not inside a conflict."
(save-excursion
(condition-case nil
(let* ((orig-point (point))
(_ (forward-line 1))
(_ (re-search-backward smerge-begin-re))
(start (match-beginning 0))
(upper-start (match-end 0))
(filename (or (match-string 1) ""))
(_ (re-search-forward smerge-end-re))
(_ (when (< (match-end 0) orig-point)
;; Point is not within the conflict we found,
;; so this conflict is not ours.
(signal 'search-failed (list smerge-begin-re))))
(lower-end (match-beginning 0))
(end (match-end 0))
(_ (re-search-backward smerge-lower-re start))
(upper-end (match-beginning 0))
(lower-start (match-end 0))
base-start base-end)
;; handle the various conflict styles
(cond
((save-excursion
(goto-char upper-start)
(re-search-forward smerge-begin-re end t))
;; There's a nested conflict and we're after the beginning
;; of the outer one but before the beginning of the inner one.
;; Of course, maybe this is not a nested conflict but in that
;; case it can only be something nastier that we don't know how
;; to handle, so may as well arbitrarily decide to treat it as
;; a nested conflict. --Stef
(error "There is a nested conflict"))
((re-search-backward smerge-base-re start t)
;; a 3-parts conflict
(setq-local smerge-conflict-style 'diff3-A)
(setq base-end upper-end)
(setq upper-end (match-beginning 0))
(setq base-start (match-end 0)))
((string= filename (file-name-nondirectory
(or buffer-file-name "")))
;; a 2-parts conflict
(setq-local smerge-conflict-style 'diff3-E))
((and (not base-start)
(or (eq smerge-conflict-style 'diff3-A)
(equal filename "ANCESTOR")
(string-match "\\`[.0-9]+\\'" filename)))
;; a same-diff conflict
(setq base-start upper-start)
(setq base-end upper-end)
(setq upper-start lower-start)
(setq upper-end lower-end)))
(store-match-data (list start end
upper-start upper-end
base-start base-end
lower-start lower-end
(when base-start (1- base-start)) base-start
(1- lower-start) lower-start))
t)
(search-failed (user-error "Point not in conflict region")))))
(defun smerge-conflict-overlay (pos)
"Return the conflict overlay at POS if any."
(let ((ols (overlays-at pos))
conflict)
(dolist (ol ols)
(if (and (eq (overlay-get ol 'smerge) 'conflict)
(> (overlay-end ol) pos))
(setq conflict ol)))
conflict))
(defun smerge-find-conflict (&optional limit)
"Find and match a conflict region. Intended as a font-lock MATCHER.
The submatches are the same as in `smerge-match-conflict'.
Returns non-nil if a match is found between point and LIMIT.
Point is moved to the end of the conflict."
(let ((found nil)
(pos (point))
conflict)
;; First check to see if point is already inside a conflict, using
;; the conflict overlays.
(while (and (not found) (setq conflict (smerge-conflict-overlay pos)))
;; Check the overlay's validity and kill it if it's out of date.
(condition-case nil
(progn
(goto-char (overlay-start conflict))
(smerge-match-conflict)
(goto-char (match-end 0))
(if (<= (point) pos)
(error "Matching backward!")
(setq found t)))
(error (smerge-remove-props
(overlay-start conflict) (overlay-end conflict))
(goto-char pos))))
;; If we're not already inside a conflict, look for the next conflict
;; and add/update its overlay.
(while (and (not found) (re-search-forward smerge-begin-re limit t))
(condition-case nil
(progn
(smerge-match-conflict)
(goto-char (match-end 0))
(let ((conflict (smerge-conflict-overlay (1- (point)))))
(if conflict
;; Update its location, just in case it got messed up.
(move-overlay conflict (match-beginning 0) (match-end 0))
(setq conflict (make-overlay (match-beginning 0) (match-end 0)
nil 'front-advance nil))
(overlay-put conflict 'evaporate t)
(overlay-put conflict 'smerge 'conflict)
(let ((props smerge-text-properties))
(while props
(overlay-put conflict (pop props) (pop props))))))
(setq found t))
(error nil)))
found))
;;; Refined change highlighting
(defvar smerge-refine-forward-function #'smerge--refine-forward
"Function used to determine an \"atomic\" element.
You can set it to `forward-char' to get char-level granularity.
Its behavior has mainly two restrictions:
- if this function encounters a newline, it's important that it stops right
after the newline.
This only matters if `smerge-refine-ignore-whitespace' is nil.
- it needs to be unaffected by changes performed by the `preproc' argument
to `smerge-refine-regions'.
This only matters if `smerge-refine-weight-hack' is nil.")
(defcustom smerge-refine-ignore-whitespace t
"If non-nil, `smerge-refine' should try to ignore change in whitespace."
:type 'boolean
:version "29.1"
:group 'diff)
(defvar smerge-refine-weight-hack t
"If non-nil, pass to diff as many lines as there are chars in the region.
I.e. each atomic element (e.g. word) will be copied as many times (on different
lines) as it has chars. This has two advantages:
- if `diff' tries to minimize the number *lines* (rather than chars)
added/removed, this adjust the weights so that adding/removing long
symbols is considered correspondingly more costly.
- `smerge-refine-forward-function' only needs to be called when chopping up
the regions, and `forward-char' can be used afterwards.
It has the following disadvantages:
- cannot use `diff -w' because the weighting causes added spaces in a line
to be represented as added copies of some line, so `diff -w' can't do the
right thing any more.
- Is a bit more costly (may in degenerate cases use temp files that are 10x
larger than the refined regions).")
(defun smerge--refine-forward (n)
(let ((case-fold-search nil)
(re "[[:upper:]]?[[:lower:]]+\\|[[:upper:]]+\\|[[:digit:]]+\\|.\\|\n"))
(when (and smerge-refine-ignore-whitespace
;; smerge-refine-weight-hack causes additional spaces to
;; appear as additional lines as well, so even if diff ignores
;; whitespace changes, it'll report added/removed lines :-(
(not smerge-refine-weight-hack))
(setq re (concat "[ \t]*\\(?:" re "\\)")))
(dotimes (_i n)
(unless (looking-at re) (error "Smerge refine internal error"))
(goto-char (match-end 0)))))
(defvar smerge--refine-long-words)
(defun smerge--refine-chopup-region (beg end file &optional preproc)
"Chopup the region from BEG to END into small elements, one per line.
Save the result into FILE.
If non-nil, PREPROC is called with no argument in a buffer that contains
a copy of the text, just before chopping it up. It can be used to replace
chars to try and eliminate some spurious differences."
;; We used to chop up char-by-char rather than word-by-word like ediff
;; does. It had the benefit of simplicity and very fine results, but it
;; often suffered from problem that diff would find correlations where
;; there aren't any, so the resulting "change" didn't make much sense.
;; You can still get this behavior by setting
;; `smerge-refine-forward-function' to `forward-char'.
(with-temp-buffer
(insert-buffer-substring (marker-buffer beg) beg end)
(when preproc (goto-char (point-min)) (funcall preproc))
(when smerge-refine-ignore-whitespace
;; It doesn't make much of a difference for diff-fine-highlight
;; because we still have the _/+/</>/! prefix anyway. Can still be
;; useful in other circumstances.
(subst-char-in-region (point-min) (point-max) ?\n ?\s))
(goto-char (point-min))
(while (not (eobp))
(cl-assert (bolp))
(let ((start (point)))
(funcall smerge-refine-forward-function 1)
(let ((len (- (point) start)))
(cl-assert (>= len 1))
;; We add \n after each chunk except after \n, so we get
;; one line per text chunk, where each line contains
;; just one chunk, except for \n chars which are
;; represented by the empty line.
(unless (bolp) (insert ?\n))
(when (and smerge-refine-weight-hack (> len 1))
(let ((s (buffer-substring-no-properties start (point))))
;; The weight-hack inserts N copies of words of size N,
;; so it naturally suffers from an O(N²) blow up.
;; To circumvent this, we map each long word
;; to a shorter (but still unique) replacement.
;; Another option would be to change smerge--refine-forward
;; so it chops up long words into smaller ones.
(when (> len 8)