summaryrefslogtreecommitdiff
path: root/lisp/vc/vc-git.el
blob: c67028001619b59588ea96744e95a44ef1a8b357 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
;;; vc-git.el --- VC backend for the git version control system -*- lexical-binding: t -*-

;; Copyright (C) 2006-2017 Free Software Foundation, Inc.

;; Author: Alexandre Julliard <julliard@winehq.org>
;; Keywords: vc tools
;; Package: vc

;; 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 <http://www.gnu.org/licenses/>.

;;; Commentary:

;; This file contains a VC backend for the git version control
;; system.
;;

;;; Installation:

;; To install: put this file on the load-path and add Git to the list
;; of supported backends in `vc-handled-backends'; the following line,
;; placed in your init file, will accomplish this:
;;
;;     (add-to-list 'vc-handled-backends 'Git)

;;; Todo:
;;  - check if more functions could use vc-git-command instead
;;     of start-process.
;;  - changelog generation

;; Implement the rest of the vc interface. See the comment at the
;; beginning of vc.el. The current status is:
;; ("??" means: "figure out what to do about it")
;;
;; FUNCTION NAME                                   STATUS
;; BACKEND PROPERTIES
;; * revision-granularity                          OK
;; STATE-QUERYING FUNCTIONS
;; * registered (file)                             OK
;; * state (file)                                  OK
;; - dir-status-files (dir files uf)               OK
;; * working-revision (file)                       OK
;; * checkout-model (files)                        OK
;; - mode-line-string (file)                       OK
;; STATE-CHANGING FUNCTIONS
;; * create-repo ()                                OK
;; * register (files &optional rev comment)        OK
;; - responsible-p (file)                          OK
;; - receive-file (file rev)                       NOT NEEDED
;; - unregister (file)                             OK
;; * checkin (files rev comment)                   OK
;; * find-revision (file rev buffer)               OK
;; * checkout (file &optional rev)                 OK
;; * revert (file &optional contents-done)         OK
;; - merge-file (file rev1 rev2)            It would be possible to merge
;;                                          changes into a single file, but
;;                                          when committing they wouldn't
;;                                          be identified as a merge
;;                                          by git, so it's probably
;;                                          not a good idea.
;; - merge-news (file)                      see `merge-file'
;; - steal-lock (file &optional revision)          NOT NEEDED
;; HISTORY FUNCTIONS
;; * print-log (files buffer &optional shortlog start-revision limit)   OK
;; - log-view-mode ()                              OK
;; - show-log-entry (revision)                     OK
;; - comment-history (file)                        ??
;; - update-changelog (files)                      COULD BE SUPPORTED
;; * diff (file &optional rev1 rev2 buffer async)  OK
;; - revision-completion-table (files)             OK
;; - annotate-command (file buf &optional rev)     OK
;; - annotate-time ()                              OK
;; - annotate-current-time ()                      NOT NEEDED
;; - annotate-extract-revision-at-line ()          OK
;; TAG SYSTEM
;; - create-tag (dir name branchp)                 OK
;; - retrieve-tag (dir name update)                OK
;; MISCELLANEOUS
;; - make-version-backups-p (file)                 NOT NEEDED
;; - previous-revision (file rev)                  OK
;; - next-revision (file rev)                      OK
;; - check-headers ()                              COULD BE SUPPORTED
;; - delete-file (file)                            OK
;; - rename-file (old new)                         OK
;; - find-file-hook ()                             OK
;; - conflicted-files                              OK

;;; Code:

(eval-when-compile
  (require 'cl-lib)
  (require 'vc)
  (require 'vc-dir)
  (require 'grep))

(defgroup vc-git nil
  "VC Git backend."
  :version "24.1"
  :group 'vc)

(defcustom vc-git-diff-switches t
  "String or list of strings specifying switches for Git diff under VC.
If nil, use the value of `vc-diff-switches'.  If t, use no switches."
  :type '(choice (const :tag "Unspecified" nil)
		 (const :tag "None" t)
		 (string :tag "Argument String")
		 (repeat :tag "Argument List" :value ("") string))
  :version "23.1")

(defcustom vc-git-annotate-switches nil
  "String or list of strings specifying switches for Git blame under VC.
If nil, use the value of `vc-annotate-switches'.  If t, use no switches."
  :type '(choice (const :tag "Unspecified" nil)
		 (const :tag "None" t)
		 (string :tag "Argument String")
		 (repeat :tag "Argument List" :value ("") string))
  :version "25.1")

(defcustom vc-git-resolve-conflicts t
  "When non-nil, mark conflicted file as resolved upon saving.
That is performed after all conflict markers in it have been
removed.  If the value is `unstage-maybe', and no merge is in
progress, then after the last conflict is resolved, also clear
the staging area."
  :type '(choice (const :tag "Don't resolve" nil)
                 (const :tag "Resolve" t)
                 (const :tag "Resolve and maybe unstage all files"
                        unstage-maybe))
  :version "25.1")

(defcustom vc-git-program "git"
  "Name of the Git executable (excluding any arguments)."
  :version "24.1"
  :type 'string)

(defcustom vc-git-root-log-format
  '("%d%h..: %an %ad %s"
    ;; The first shy group matches the characters drawn by --graph.
    ;; We use numbered groups because `log-view-message-re' wants the
    ;; revision number to be group 1.
    "^\\(?:[*/\\| ]+ \\)?\\(?2: ([^)]+)\\)?\\(?1:[0-9a-z]+\\)..: \
\\(?3:.*?\\)[ \t]+\\(?4:[0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\}\\)"
    ((1 'log-view-message-face)
     (2 'change-log-list nil lax)
     (3 'change-log-name)
     (4 'change-log-date)))
  "Git log format for `vc-print-root-log'.
This should be a list (FORMAT REGEXP KEYWORDS), where FORMAT is a
format string (which is passed to \"git log\" via the argument
\"--pretty=tformat:FORMAT\"), REGEXP is a regular expression
matching the resulting Git log output, and KEYWORDS is a list of
`font-lock-keywords' for highlighting the Log View buffer."
  :type '(list string string (repeat sexp))
  :version "24.1")

(defcustom vc-git-commits-coding-system 'utf-8
  "Default coding system for sending commit log messages to Git.

Should be consistent with the Git config value i18n.commitEncoding,
and should also be consistent with `locale-coding-system'."
  :type '(coding-system :tag "Coding system to encode Git commit logs")
  :version "25.1")

(defcustom vc-git-log-output-coding-system 'utf-8
  "Default coding system for receiving log output from Git.

Should be consistent with the Git config value i18n.logOutputEncoding."
  :type '(coding-system :tag "Coding system to decode Git log output")
  :version "25.1")

;; History of Git commands.
(defvar vc-git-history nil)

;;; BACKEND PROPERTIES

(defun vc-git-revision-granularity () 'repository)
(defun vc-git-checkout-model (_files) 'implicit)

;;; STATE-QUERYING FUNCTIONS

;;;###autoload (defun vc-git-registered (file)
;;;###autoload   "Return non-nil if FILE is registered with git."
;;;###autoload   (if (vc-find-root file ".git")       ; Short cut.
;;;###autoload       (progn
;;;###autoload         (load "vc-git" nil t)
;;;###autoload         (vc-git-registered file))))

(defun vc-git-registered (file)
  "Check whether FILE is registered with git."
  (let ((dir (vc-git-root file)))
    (when dir
      (with-temp-buffer
        (let* (process-file-side-effects
               ;; Do not use the `file-name-directory' here: git-ls-files
               ;; sometimes fails to return the correct status for relative
               ;; path specs.
               ;; See also: http://marc.info/?l=git&m=125787684318129&w=2
               (name (file-relative-name file dir))
               (str (ignore-errors
                      (cd dir)
                      (vc-git--out-ok "ls-files" "-c" "-z" "--" name)
                      ;; If result is empty, use ls-tree to check for deleted
                      ;; file.
                      (when (eq (point-min) (point-max))
                        (vc-git--out-ok "ls-tree" "--name-only" "-z" "HEAD"
                                        "--" name))
                      (buffer-string))))
          (and str
               (> (length str) (length name))
               (string= (substring str 0 (1+ (length name)))
                        (concat name "\0"))))))))

(defun vc-git--state-code (code)
  "Convert from a string to a added/deleted/modified state."
  (pcase (string-to-char code)
    (?M 'edited)
    (?A 'added)
    (?D 'removed)
    (?U 'edited)     ;; FIXME
    (?T 'edited)))   ;; FIXME

(defun vc-git-state (file)
  "Git-specific version of `vc-state'."
  ;; FIXME: This can't set 'ignored or 'conflict yet
  ;; The 'ignored state could be detected with `git ls-files -i -o
  ;; --exclude-standard` It also can't set 'needs-update or
  ;; 'needs-merge. The rough equivalent would be that upstream branch
  ;; for current branch is in fast-forward state i.e. current branch
  ;; is direct ancestor of corresponding upstream branch, and the file
  ;; was modified upstream.  But we can't check that without a network
  ;; operation.
  ;; This assumes that status is known to be not `unregistered' because
  ;; we've been successfully dispatched here from `vc-state', that
  ;; means `vc-git-registered' returned t earlier once.  Bug#11757
  (let ((diff (vc-git--run-command-string
               file "diff-index" "-p" "--raw" "-z" "HEAD" "--")))
    (if (and diff
             (string-match ":[0-7]\\{6\\} [0-7]\\{6\\} [0-9a-f]\\{40\\} [0-9a-f]\\{40\\} \\([ADMUT]\\)\0[^\0]+\0\\(.*\n.\\)?"
                           diff))
        (let ((diff-letter (match-string 1 diff)))
          (if (not (match-beginning 2))
              ;; Empty diff: file contents is the same as the HEAD
              ;; revision, but timestamps are different (eg, file
              ;; was "touch"ed).  Update timestamp in index:
              (prog1 'up-to-date
                (vc-git--call nil "add" "--refresh" "--"
                              (file-relative-name file)))
            (vc-git--state-code diff-letter)))
      (if (vc-git--empty-db-p) 'added 'up-to-date))))

(defun vc-git-working-revision (_file)
  "Git-specific version of `vc-working-revision'."
  (let (process-file-side-effects)
    (vc-git--rev-parse "HEAD")))

(defun vc-git--symbolic-ref (file)
  (or
   (vc-file-getprop file 'vc-git-symbolic-ref)
   (let* (process-file-side-effects
          (str (vc-git--run-command-string nil "symbolic-ref" "HEAD")))
     (vc-file-setprop file 'vc-git-symbolic-ref
                      (if str
                          (if (string-match "^\\(refs/heads/\\)?\\(.+\\)$" str)
                              (match-string 2 str)
                            str))))))

(defun vc-git-mode-line-string (file)
  "Return a string for `vc-mode-line' to put in the mode line for FILE."
  (let* ((rev (vc-working-revision file 'Git))
         (disp-rev (or (vc-git--symbolic-ref file)
                       (substring rev 0 7)))
         (def-ml (vc-default-mode-line-string 'Git file))
         (help-echo (get-text-property 0 'help-echo def-ml))
         (face   (get-text-property 0 'face def-ml)))
    (propertize (concat (substring def-ml 0 4) disp-rev)
                'face face
                'help-echo (concat help-echo "\nCurrent revision: " rev))))

(cl-defstruct (vc-git-extra-fileinfo
            (:copier nil)
            (:constructor vc-git-create-extra-fileinfo
                          (old-perm new-perm &optional rename-state orig-name))
            (:conc-name vc-git-extra-fileinfo->))
  old-perm new-perm   ;; Permission flags.
  rename-state        ;; Rename or copy state.
  orig-name)          ;; Original name for renames or copies.

(defun vc-git-escape-file-name (name)
  "Escape a file name if necessary."
  (if (string-match "[\n\t\"\\]" name)
      (concat "\""
              (mapconcat (lambda (c)
                   (pcase c
                     (?\n "\\n")
                     (?\t "\\t")
                     (?\\ "\\\\")
                     (?\" "\\\"")
                     (_ (char-to-string c))))
                 name "")
              "\"")
    name))

(defun vc-git-file-type-as-string (old-perm new-perm)
  "Return a string describing the file type based on its permissions."
  (let* ((old-type (lsh (or old-perm 0) -9))
	 (new-type (lsh (or new-perm 0) -9))
	 (str (pcase new-type
		(?\100  ;; File.
		 (pcase old-type
		   (?\100 nil)
		   (?\120 "   (type change symlink -> file)")
		   (?\160 "   (type change subproject -> file)")))
		 (?\120  ;; Symlink.
		  (pcase old-type
		    (?\100 "   (type change file -> symlink)")
		    (?\160 "   (type change subproject -> symlink)")
		    (_ "   (symlink)")))
		  (?\160  ;; Subproject.
		   (pcase old-type
		     (?\100 "   (type change file -> subproject)")
		     (?\120 "   (type change symlink -> subproject)")
		     (_ "   (subproject)")))
                  (?\110 nil)  ;; Directory (internal, not a real git state).
		  (?\000  ;; Deleted or unknown.
		   (pcase old-type
		     (?\120 "   (symlink)")
		     (?\160 "   (subproject)")))
		  (_ (format "   (unknown type %o)" new-type)))))
    (cond (str (propertize str 'face 'font-lock-comment-face))
          ((eq new-type ?\110) "/")
          (t ""))))

(defun vc-git-rename-as-string (state extra)
  "Return a string describing the copy or rename associated with INFO,
or an empty string if none."
  (let ((rename-state (when extra
			(vc-git-extra-fileinfo->rename-state extra))))
    (if rename-state
        (propertize
         (concat "   ("
                 (if (eq rename-state 'copy) "copied from "
                   (if (eq state 'added) "renamed from "
                     "renamed to "))
                 (vc-git-escape-file-name
                  (vc-git-extra-fileinfo->orig-name extra))
                 ")")
         'face 'font-lock-comment-face)
      "")))

(defun vc-git-permissions-as-string (old-perm new-perm)
  "Format a permission change as string."
  (propertize
   (if (or (not old-perm)
           (not new-perm)
           (eq 0 (logand ?\111 (logxor old-perm new-perm))))
       "  "
     (if (eq 0 (logand ?\111 old-perm)) "+x" "-x"))
  'face 'font-lock-type-face))

(defun vc-git-dir-printer (info)
  "Pretty-printer for the vc-dir-fileinfo structure."
  (let* ((isdir (vc-dir-fileinfo->directory info))
	 (state (if isdir "" (vc-dir-fileinfo->state info)))
         (extra (vc-dir-fileinfo->extra info))
         (old-perm (when extra (vc-git-extra-fileinfo->old-perm extra)))
         (new-perm (when extra (vc-git-extra-fileinfo->new-perm extra))))
    (insert
     "  "
     (propertize (format "%c" (if (vc-dir-fileinfo->marked info) ?* ? ))
                 'face 'font-lock-type-face)
     "  "
     (propertize
      (format "%-12s" state)
      'face (cond ((eq state 'up-to-date) 'font-lock-builtin-face)
		  ((eq state 'missing) 'font-lock-warning-face)
		  (t 'font-lock-variable-name-face))
      'mouse-face 'highlight)
     "  " (vc-git-permissions-as-string old-perm new-perm)
     "    "
     (propertize (vc-git-escape-file-name (vc-dir-fileinfo->name info))
                 'face (if isdir 'font-lock-comment-delimiter-face
                         'font-lock-function-name-face)
		 'help-echo
		 (if isdir
		     "Directory\nVC operations can be applied to it\nmouse-3: Pop-up menu"
		   "File\nmouse-3: Pop-up menu")
		 'keymap vc-dir-filename-mouse-map
		 'mouse-face 'highlight)
     (vc-git-file-type-as-string old-perm new-perm)
     (vc-git-rename-as-string state extra))))

(defun vc-git-after-dir-status-stage (stage files update-function)
  "Process sentinel for the various dir-status stages."
  (let (next-stage result)
    (goto-char (point-min))
    (pcase stage
      (`update-index
       (setq next-stage (if (vc-git--empty-db-p) 'ls-files-added 'diff-index)))
      (`ls-files-added
       (setq next-stage 'ls-files-unknown)
       (while (re-search-forward "\\([0-7]\\{6\\}\\) [0-9a-f]\\{40\\} 0\t\\([^\0]+\\)\0" nil t)
         (let ((new-perm (string-to-number (match-string 1) 8))
               (name (match-string 2)))
           (push (list name 'added (vc-git-create-extra-fileinfo 0 new-perm))
                 result))))
      (`ls-files-up-to-date
       (setq next-stage 'ls-files-unknown)
       (while (re-search-forward "\\([0-7]\\{6\\}\\) [0-9a-f]\\{40\\} 0\t\\([^\0]+\\)\0" nil t)
         (let ((perm (string-to-number (match-string 1) 8))
               (name (match-string 2)))
           (push (list name 'up-to-date
                       (vc-git-create-extra-fileinfo perm perm))
                 result))))
      (`ls-files-unknown
       (when files (setq next-stage 'ls-files-ignored))
       (while (re-search-forward "\\([^\0]*?\\)\0" nil t 1)
         (push (list (match-string 1) 'unregistered
                     (vc-git-create-extra-fileinfo 0 0))
               result)))
      (`ls-files-ignored
       (while (re-search-forward "\\([^\0]*?\\)\0" nil t 1)
         (push (list (match-string 1) 'ignored
                     (vc-git-create-extra-fileinfo 0 0))
               result)))
      (`diff-index
       (setq next-stage (if files 'ls-files-up-to-date 'ls-files-unknown))
       (while (re-search-forward
               ":\\([0-7]\\{6\\}\\) \\([0-7]\\{6\\}\\) [0-9a-f]\\{40\\} [0-9a-f]\\{40\\} \\(\\([ADMUT]\\)\0\\([^\0]+\\)\\|\\([CR]\\)[0-9]*\0\\([^\0]+\\)\0\\([^\0]+\\)\\)\0"
               nil t 1)
         (let ((old-perm (string-to-number (match-string 1) 8))
               (new-perm (string-to-number (match-string 2) 8))
               (state (or (match-string 4) (match-string 6)))
               (name (or (match-string 5) (match-string 7)))
               (new-name (match-string 8)))
           (if new-name  ; Copy or rename.
               (if (eq ?C (string-to-char state))
                   (push (list new-name 'added
                               (vc-git-create-extra-fileinfo old-perm new-perm
                                                             'copy name))
                         result)
                 (push (list name 'removed
                             (vc-git-create-extra-fileinfo 0 0
                                                           'rename new-name))
                       result)
                 (push (list new-name 'added
                             (vc-git-create-extra-fileinfo old-perm new-perm
                                                           'rename name))
                       result))
             (push (list name (vc-git--state-code state)
                         (vc-git-create-extra-fileinfo old-perm new-perm))
                   result))))))
    (when result
      (setq result (nreverse result))
      (when files
        (dolist (entry result) (setq files (delete (car entry) files)))
        (unless files (setq next-stage nil))))
    (when (or result (not next-stage))
      (funcall update-function result next-stage))
    (when next-stage
      (vc-git-dir-status-goto-stage next-stage files update-function))))

;; Follows vc-git-command (or vc-do-async-command), which uses vc-do-command
;; from vc-dispatcher.
(declare-function vc-exec-after "vc-dispatcher" (code))
;; Follows vc-exec-after.
(declare-function vc-set-async-update "vc-dispatcher" (process-buffer))

(defun vc-git-dir-status-goto-stage (stage files update-function)
  (erase-buffer)
  (pcase stage
    (`update-index
     (if files
         (vc-git-command (current-buffer) 'async files "add" "--refresh" "--")
       (vc-git-command (current-buffer) 'async nil
                       "update-index" "--refresh")))
    (`ls-files-added
     (vc-git-command (current-buffer) 'async files
                     "ls-files" "-z" "-c" "-s" "--"))
    (`ls-files-up-to-date
     (vc-git-command (current-buffer) 'async files
                     "ls-files" "-z" "-c" "-s" "--"))
    (`ls-files-unknown
     (vc-git-command (current-buffer) 'async files
                     "ls-files" "-z" "-o" "--directory"
                     "--no-empty-directory" "--exclude-standard" "--"))
    (`ls-files-ignored
     (vc-git-command (current-buffer) 'async files
                     "ls-files" "-z" "-o" "-i" "--directory"
                     "--no-empty-directory" "--exclude-standard" "--"))
    ;; --relative added in Git 1.5.5.
    (`diff-index
     (vc-git-command (current-buffer) 'async files
                     "diff-index" "--relative" "-z" "-M" "HEAD" "--")))
  (vc-run-delayed
   (vc-git-after-dir-status-stage stage files update-function)))

(defun vc-git-dir-status-files (_dir files update-function)
  "Return a list of (FILE STATE EXTRA) entries for DIR."
  ;; Further things that would have to be fixed later:
  ;; - how to handle unregistered directories
  ;; - how to support vc-dir on a subdir of the project tree
  (vc-git-dir-status-goto-stage 'update-index files update-function))

(defvar vc-git-stash-map
  (let ((map (make-sparse-keymap)))
    ;; Turn off vc-dir marking
    (define-key map [mouse-2] 'ignore)

    (define-key map [down-mouse-3] 'vc-git-stash-menu)
    (define-key map "\C-k" 'vc-git-stash-delete-at-point)
    (define-key map "=" 'vc-git-stash-show-at-point)
    (define-key map "\C-m" 'vc-git-stash-show-at-point)
    (define-key map "A" 'vc-git-stash-apply-at-point)
    (define-key map "P" 'vc-git-stash-pop-at-point)
    (define-key map "S" 'vc-git-stash-snapshot)
    map))

(defvar vc-git-stash-menu-map
  (let ((map (make-sparse-keymap "Git Stash")))
    (define-key map [de]
      '(menu-item "Delete Stash" vc-git-stash-delete-at-point
		  :help "Delete the current stash"))
    (define-key map [ap]
      '(menu-item "Apply Stash" vc-git-stash-apply-at-point
		  :help "Apply the current stash and keep it in the stash list"))
    (define-key map [po]
      '(menu-item "Apply and Remove Stash (Pop)" vc-git-stash-pop-at-point
		  :help "Apply the current stash and remove it"))
    (define-key map [sh]
      '(menu-item "Show Stash" vc-git-stash-show-at-point
		  :help "Show the contents of the current stash"))
    map))

(defun vc-git-dir-extra-headers (dir)
  (let ((str (with-output-to-string
               (with-current-buffer standard-output
                 (vc-git--out-ok "symbolic-ref" "HEAD"))))
	(stash (vc-git-stash-list))
	(stash-help-echo "Use M-x vc-git-stash to create stashes.")
	branch remote remote-url)
    (if (string-match "^\\(refs/heads/\\)?\\(.+\\)$" str)
	(progn
	  (setq branch (match-string 2 str))
	  (setq remote
		(with-output-to-string
		  (with-current-buffer standard-output
		    (vc-git--out-ok "config"
                                    (concat "branch." branch ".remote")))))
	  (when (string-match "\\([^\n]+\\)" remote)
	    (setq remote (match-string 1 remote)))
	  (when remote
	    (setq remote-url
		  (with-output-to-string
		    (with-current-buffer standard-output
		      (vc-git--out-ok "config"
                                      (concat "remote." remote ".url"))))))
	  (when (string-match "\\([^\n]+\\)" remote-url)
	    (setq remote-url (match-string 1 remote-url))))
      (setq branch "not (detached HEAD)"))
    ;; FIXME: maybe use a different face when nothing is stashed.
    (concat
     (propertize "Branch     : " 'face 'font-lock-type-face)
     (propertize branch
		 'face 'font-lock-variable-name-face)
     (when remote
       (concat
	"\n"
	(propertize "Remote     : " 'face 'font-lock-type-face)
	(propertize remote-url
		    'face 'font-lock-variable-name-face)))
     "\n"
     ;; For now just a heading, key bindings can be added later for various bisect actions
     (when (file-exists-p (expand-file-name ".git/BISECT_START" (vc-git-root dir)))
       (propertize  "Bisect     : in progress\n" 'face 'font-lock-warning-face))
     (when (file-exists-p (expand-file-name ".git/rebase-apply" (vc-git-root dir)))
       (propertize  "Rebase     : in progress\n" 'face 'font-lock-warning-face))
     (if stash
       (concat
	(propertize "Stash      :\n" 'face 'font-lock-type-face
		    'help-echo stash-help-echo)
	(mapconcat
	 (lambda (x)
	   (propertize x
		       'face 'font-lock-variable-name-face
		       'mouse-face 'highlight
		       'help-echo "mouse-3: Show stash menu\nRET: Show stash\nA: Apply stash\nP: Apply and remove stash (pop)\nC-k: Delete stash"
		       'keymap vc-git-stash-map))
	 stash "\n"))
       (concat
	(propertize "Stash      : " 'face 'font-lock-type-face
		    'help-echo stash-help-echo)
	(propertize "Nothing stashed"
		    'help-echo stash-help-echo
		    'face 'font-lock-variable-name-face))))))

(defun vc-git-branches ()
  "Return the existing branches, as a list of strings.
The car of the list is the current branch."
  (with-temp-buffer
    (vc-git--call t "branch")
    (goto-char (point-min))
    (let (current-branch branches)
      (while (not (eobp))
	(when (looking-at "^\\([ *]\\) \\(.+\\)$")
	  (if (string-equal (match-string 1) "*")
	      (setq current-branch (match-string 2))
	    (push (match-string 2) branches)))
	(forward-line 1))
      (cons current-branch (nreverse branches)))))

;;; STATE-CHANGING FUNCTIONS

(defun vc-git-create-repo ()
  "Create a new Git repository."
  (vc-git-command nil 0 nil "init"))

(defun vc-git-register (files &optional _comment)
  "Register FILES into the git version-control system."
  (let (flist dlist)
    (dolist (crt files)
      (if (file-directory-p crt)
	  (push crt dlist)
	(push crt flist)))
    (when flist
      (vc-git-command nil 0 flist "update-index" "--add" "--"))
    (when dlist
      (vc-git-command nil 0 dlist "add"))))

(defalias 'vc-git-responsible-p 'vc-git-root)

(defun vc-git-unregister (file)
  (vc-git-command nil 0 file "rm" "-f" "--cached" "--"))

(declare-function log-edit-mode "log-edit" ())
(declare-function log-edit-toggle-header "log-edit" (header value))
(declare-function log-edit-extract-headers "log-edit" (headers string))
(declare-function log-edit-set-header "log-edit" (header value &optional toggle))

(defun vc-git-log-edit-toggle-signoff ()
  "Toggle whether to add the \"Signed-off-by\" line at the end of
the commit message."
  (interactive)
  (log-edit-toggle-header "Sign-Off" "yes"))

(defun vc-git-log-edit-toggle-amend ()
  "Toggle whether this will amend the previous commit.
If toggling on, also insert its message into the buffer."
  (interactive)
  (when (log-edit-toggle-header "Amend" "yes")
    (goto-char (point-max))
    (unless (bolp) (insert "\n"))
    (insert (with-output-to-string
              (vc-git-command
               standard-output 1 nil
               "log" "--max-count=1" "--pretty=format:%B" "HEAD")))
    (save-excursion
      (rfc822-goto-eoh)
      (forward-line 1)
      (let ((pt (point)))
        (and (zerop (forward-line 1))
             (looking-at "\n\\|\\'")
             (let ((summary (buffer-substring-no-properties pt (1- (point)))))
               (skip-chars-forward " \n")
               (delete-region pt (point))
               (log-edit-set-header "Summary" summary)))))))

(defvar vc-git-log-edit-mode-map
  (let ((map (make-sparse-keymap "Git-Log-Edit")))
    (define-key map "\C-c\C-s" 'vc-git-log-edit-toggle-signoff)
    (define-key map "\C-c\C-e" 'vc-git-log-edit-toggle-amend)
    map))

(define-derived-mode vc-git-log-edit-mode log-edit-mode "Log-Edit/git"
  "Major mode for editing Git log messages.
It is based on `log-edit-mode', and has Git-specific extensions.")

(defun vc-git-checkin (files comment &optional _rev)
  (let* ((file1 (or (car files) default-directory))
         (root (vc-git-root file1))
         (default-directory (expand-file-name root))
         (only (or (cdr files)
                   (not (equal root (abbreviate-file-name file1)))))
         (pcsw coding-system-for-write)
         (coding-system-for-write
          ;; On MS-Windows, we must encode command-line arguments in
          ;; the system codepage.
          (if (eq system-type 'windows-nt)
              locale-coding-system
            (or coding-system-for-write vc-git-commits-coding-system)))
         (msg-file
          ;; On MS-Windows, pass the commit log message through a
          ;; file, to work around the limitation that command-line
          ;; arguments must be in the system codepage, and therefore
          ;; might not support the non-ASCII characters in the log
          ;; message.  Handle also remote files.
          (if (eq system-type 'windows-nt)
              (let ((default-directory (file-name-directory file1)))
                (file-local-name (make-nearby-temp-file "git-msg"))))))
    (cl-flet ((boolean-arg-fn
               (argument)
               (lambda (value) (when (equal value "yes") (list argument)))))
      ;; When operating on the whole tree, better pass "-a" than ".", since "."
      ;; fails when we're committing a merge.
      (apply 'vc-git-command nil 0 (if only files)
             (nconc (if msg-file (list "commit" "-F" msg-file)
                      (list "commit" "-m"))
                    (let ((args
                           (log-edit-extract-headers
                            `(("Author" . "--author")
                              ("Date" . "--date")
                              ("Amend" . ,(boolean-arg-fn "--amend"))
                              ("Sign-Off" . ,(boolean-arg-fn "--signoff")))
                            comment)))
                      (when msg-file
                        (let ((coding-system-for-write
                               (or pcsw vc-git-commits-coding-system)))
                          (write-region (car args) nil msg-file))
                        (setq args (cdr args)))
                      args)
		    (if only (list "--only" "--") '("-a")))))
    (if (and msg-file (file-exists-p msg-file)) (delete-file msg-file))))

(defun vc-git-find-revision (file rev buffer)
  (let* (process-file-side-effects
	 (coding-system-for-read 'binary)
	 (coding-system-for-write 'binary)
	 (fullname
	  (let ((fn (vc-git--run-command-string
		     file "ls-files" "-z" "--full-name" "--")))
	    ;; ls-files does not return anything when looking for a
	    ;; revision of a file that has been renamed or removed.
	    (if (string= fn "")
		(file-relative-name file (vc-git-root default-directory))
	      (substring fn 0 -1)))))
    (vc-git-command
     buffer 0
     nil
     "cat-file" "blob" (concat (if rev rev "HEAD") ":" fullname))))

(defun vc-git-find-ignore-file (file)
  "Return the git ignore file that controls FILE."
  (expand-file-name ".gitignore"
		    (vc-git-root file)))

(defun vc-git-checkout (file &optional rev)
  (vc-git-command nil 0 file "checkout" (or rev "HEAD")))

(defun vc-git-revert (file &optional contents-done)
  "Revert FILE to the version stored in the git repository."
  (if contents-done
      (vc-git-command nil 0 file "update-index" "--")
    (vc-git-command nil 0 file "reset" "-q" "--")
    (vc-git-command nil nil file "checkout" "-q" "--")))

(defvar vc-git-error-regexp-alist
  '(("^ \\(.+\\) |" 1 nil nil 0))
  "Value of `compilation-error-regexp-alist' in *vc-git* buffers.")

;; To be called via vc-pull from vc.el, which requires vc-dispatcher.
(declare-function vc-compilation-mode "vc-dispatcher" (backend))

(defun vc-git--pushpull (command prompt)
  "Run COMMAND (a string; either push or pull) on the current Git branch.
If PROMPT is non-nil, prompt for the Git command to run."
  (let* ((root (vc-git-root default-directory))
	 (buffer (format "*vc-git : %s*" (expand-file-name root)))
	 (git-program vc-git-program)
	 args)
    ;; If necessary, prompt for the exact command.
    ;; TODO if pushing, prompt if no default push location - cf bzr.
    (when prompt
      (setq args (split-string
		  (read-shell-command
                   (format "Git %s command: " command)
                   (format "%s %s" git-program command)
                   'vc-git-history)
		  " " t))
      (setq git-program (car  args)
	    command     (cadr args)
	    args        (cddr args)))
    (require 'vc-dispatcher)
    (apply 'vc-do-async-command buffer root git-program command args)
    (with-current-buffer buffer
      (vc-run-delayed
        (vc-compilation-mode 'git)
        (setq-local compile-command
                    (concat git-program " " command " "
                            (if args (mapconcat 'identity args " ") "")))))
    (vc-set-async-update buffer)))

(defun vc-git-pull (prompt)
  "Pull changes into the current Git branch.
Normally, this runs \"git pull\".  If PROMPT is non-nil, prompt
for the Git command to run."
  (vc-git--pushpull "pull" prompt))

(defun vc-git-push (prompt)
  "Push changes from the current Git branch.
Normally, this runs \"git push\".  If PROMPT is non-nil, prompt
for the Git command to run."
  (vc-git--pushpull "push" prompt))

(defun vc-git-merge-branch ()
  "Merge changes into the current Git branch.
This prompts for a branch to merge from."
  (let* ((root (vc-git-root default-directory))
	 (buffer (format "*vc-git : %s*" (expand-file-name root)))
	 (branches (cdr (vc-git-branches)))
	 (merge-source
	  (completing-read "Merge from branch: "
			   (if (or (member "FETCH_HEAD" branches)
				   (not (file-readable-p
					 (expand-file-name ".git/FETCH_HEAD"
							   root))))
			       branches
			     (cons "FETCH_HEAD" branches))
			   nil t)))
    (apply 'vc-do-async-command buffer root vc-git-program "merge"
	   (list merge-source))
    (with-current-buffer buffer (vc-run-delayed (vc-compilation-mode 'git)))
    (vc-set-async-update buffer)))

(defun vc-git-conflicted-files (directory)
  "Return the list of files with conflicts in DIRECTORY."
  (let* ((status
          (vc-git--run-command-string directory "status" "--porcelain" "--"))
         (lines (when status (split-string status "\n" 'omit-nulls)))
         files)
    ;; TODO: Look into reimplementing `vc-git-state', as well as
    ;; `vc-git-dir-status-files', based on this output, thus making the
    ;; extra process call in `vc-git-find-file-hook' unnecessary.
    (dolist (line lines files)
      (when (string-match "\\([ MADRCU?!][ MADRCU?!]\\) \\(.+\\)\\(?: -> \\(.+\\)\\)?"
                          line)
        (let ((state (match-string 1 line))
              (file (match-string 2 line)))
          ;; See git-status(1).
          (when (member state '("AU" "UD" "UA" ;; "DD"
                                "DU" "AA" "UU"))
            (push (expand-file-name file directory) files)))))))

(defun vc-git-resolve-when-done ()
  "Call \"git add\" if the conflict markers have been removed."
  (save-excursion
    (goto-char (point-min))
    (unless (re-search-forward "^<<<<<<< " nil t)
      (vc-git-command nil 0 buffer-file-name "add")
      (unless (or
               (not (eq vc-git-resolve-conflicts 'unstage-maybe))
               ;; Doing a merge, so bug#20292 doesn't apply.
               (file-exists-p (expand-file-name ".git/MERGE_HEAD"
                                                (vc-git-root buffer-file-name)))
               (vc-git-conflicted-files (vc-git-root buffer-file-name)))
        (vc-git-command nil 0 nil "reset"))
      ;; Remove the hook so that it is not called multiple times.
      (remove-hook 'after-save-hook 'vc-git-resolve-when-done t))))

(defun vc-git-find-file-hook ()
  "Activate `smerge-mode' if there is a conflict."
  (when (and buffer-file-name
             ;; FIXME
             ;; 1) the net result is to call git twice per file.
             ;; 2) v-g-c-f is documented to take a directory.
             ;; http://lists.gnu.org/archive/html/emacs-devel/2014-01/msg01126.html
             (vc-git-conflicted-files buffer-file-name)
             (save-excursion
               (goto-char (point-min))
               (re-search-forward "^<<<<<<< " nil 'noerror)))
    (vc-file-setprop buffer-file-name 'vc-state 'conflict)
    (smerge-start-session)
    (when vc-git-resolve-conflicts
      (add-hook 'after-save-hook 'vc-git-resolve-when-done nil 'local))
    (vc-message-unresolved-conflicts buffer-file-name)))

;;; HISTORY FUNCTIONS

(autoload 'vc-setup-buffer "vc-dispatcher")

(defcustom vc-git-print-log-follow nil
  "If true, follow renames in Git logs for files."
  :type 'boolean
  :version "26.1")

(defun vc-git-print-log (files buffer &optional shortlog start-revision limit)
  "Print commit log associated with FILES into specified BUFFER.
If SHORTLOG is non-nil, use a short format based on `vc-git-root-log-format'.
\(This requires at least Git version 1.5.6, for the --graph option.)
If START-REVISION is non-nil, it is the newest revision to show.
If LIMIT is non-nil, show no more than this many entries."
  (let ((coding-system-for-read
         (or coding-system-for-read vc-git-log-output-coding-system)))
    ;; `vc-do-command' creates the buffer, but we need it before running
    ;; the command.
    (vc-setup-buffer buffer)
    ;; If the buffer exists from a previous invocation it might be
    ;; read-only.
    (let ((inhibit-read-only t))
      (with-current-buffer
          buffer
	(apply 'vc-git-command buffer
	       'async files
	       (append
		'("log" "--no-color")
                (when (and vc-git-print-log-follow
                           (not (cl-some #'file-directory-p files)))
                  ;; "--follow" on directories is broken
                  ;; https://debbugs.gnu.org/cgi/bugreport.cgi?bug=8756
                  ;; https://debbugs.gnu.org/cgi/bugreport.cgi?bug=16422
                  (list "--follow"))
		(when shortlog
		  `("--graph" "--decorate" "--date=short"
                    ,(format "--pretty=tformat:%s"
			     (car vc-git-root-log-format))
		    "--abbrev-commit"))
		(when limit (list "-n" (format "%s" limit)))
		(when start-revision (list start-revision))
		'("--")))))))

(defun vc-git-log-outgoing (buffer remote-location)
  (interactive)
  (vc-git-command
   buffer 0 nil
   "log"
   "--no-color" "--graph" "--decorate" "--date=short"
   (format "--pretty=tformat:%s" (car vc-git-root-log-format))
   "--abbrev-commit"
   (concat (if (string= remote-location "")
	       "@{upstream}"
	     remote-location)
	   "..HEAD")))

(defun vc-git-log-incoming (buffer remote-location)
  (interactive)
  (vc-git-command nil 0 nil "fetch")
  (vc-git-command
   buffer 0 nil
   "log"
   "--no-color" "--graph" "--decorate" "--date=short"
   (format "--pretty=tformat:%s" (car vc-git-root-log-format))
   "--abbrev-commit"
   (concat "HEAD.." (if (string= remote-location "")
			"@{upstream}"
		      remote-location))))

(defvar log-view-message-re)
(defvar log-view-file-re)
(defvar log-view-font-lock-keywords)
(defvar log-view-per-file-logs)
(defvar log-view-expanded-log-entry-function)

(define-derived-mode vc-git-log-view-mode log-view-mode "Git-Log-View"
  (require 'add-log) ;; We need the faces add-log.
  ;; Don't have file markers, so use impossible regexp.
  (set (make-local-variable 'log-view-file-re) "\\`a\\`")
  (set (make-local-variable 'log-view-per-file-logs) nil)
  (set (make-local-variable 'log-view-message-re)
       (if (not (eq vc-log-view-type 'long))
	   (cadr vc-git-root-log-format)
	 "^commit *\\([0-9a-z]+\\)"))
  ;; Allow expanding short log entries.
  (when (eq vc-log-view-type 'short)
    (setq truncate-lines t)
    (set (make-local-variable 'log-view-expanded-log-entry-function)
	 'vc-git-expanded-log-entry))
  (set (make-local-variable 'log-view-font-lock-keywords)
       (if (not (eq vc-log-view-type 'long))
	   (list (cons (nth 1 vc-git-root-log-format)
		       (nth 2 vc-git-root-log-format)))
	 (append
	  `((,log-view-message-re (1 'change-log-acknowledgment)))
	  ;; Handle the case:
	  ;; user: foo@bar
	  '(("^Author:[ \t]+\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)"
	     (1 'change-log-email))
	    ;; Handle the case:
	    ;; user: FirstName LastName <foo@bar>
	    ("^Author:[ \t]+\\([^<(]+?\\)[ \t]*[(<]\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)[>)]"
	     (1 'change-log-name)
	     (2 'change-log-email))
	    ("^ +\\(?:\\(?:[Aa]cked\\|[Ss]igned-[Oo]ff\\)-[Bb]y:\\)[ \t]+\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)"
	     (1 'change-log-name))
	    ("^ +\\(?:\\(?:[Aa]cked\\|[Ss]igned-[Oo]ff\\)-[Bb]y:\\)[ \t]+\\([^<(]+?\\)[ \t]*[(<]\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)[>)]"
	     (1 'change-log-name)
	     (2 'change-log-email))
	    ("^Merge: \\([0-9a-z]+\\) \\([0-9a-z]+\\)"
	     (1 'change-log-acknowledgment)
	     (2 'change-log-acknowledgment))
	    ("^Date:   \\(.+\\)" (1 'change-log-date))
	    ("^summary:[ \t]+\\(.+\\)" (1 'log-view-message)))))))


(defun vc-git-show-log-entry (revision)
  "Move to the log entry for REVISION.
REVISION may have the form BRANCH, BRANCH~N,
or BRANCH^ (where \"^\" can be repeated)."
  (goto-char (point-min))
  (prog1
      (when revision
        (search-forward
         (format "\ncommit %s" revision) nil t
         (cond ((string-match "~\\([0-9]\\)\\'" revision)
                (1+ (string-to-number (match-string 1 revision))))
               ((string-match "\\^+\\'" revision)
                (1+ (length (match-string 0 revision))))
               (t nil))))
    (beginning-of-line)))

(defun vc-git-expanded-log-entry (revision)
  (with-temp-buffer
    (apply 'vc-git-command t nil nil (list "log" revision "-1" "--"))
    (goto-char (point-min))
    (unless (eobp)
      ;; Indent the expanded log entry.
      (while (re-search-forward "^  " nil t)
        (replace-match "")
        (forward-line))
      (buffer-string))))

(defun vc-git-region-history (file buffer lfrom lto)
  "Insert into BUFFER the history of FILE for lines LFROM to LTO.
This requires git 1.8.4 or later, for the \"-L\" option of \"git log\"."
  ;; The "git log" command below interprets the line numbers as applying
  ;; to the HEAD version of the file, not to the current state of the file.
  ;; So we need to look at all the local changes and adjust lfrom/lto
  ;; accordingly.
  ;; FIXME: Maybe this should be done in vc.el (i.e. for all backends), but
  ;; since Git is the only backend to support this operation so far, it's hard
  ;; to tell.
  (with-temp-buffer
    (vc-call-backend 'git 'diff file "HEAD" nil (current-buffer))
    (goto-char (point-min))
    (let ((last-offset 0)
          (from-offset nil)
          (to-offset nil))
      (while (re-search-forward
              "^@@ -\\([0-9]+\\),\\([0-9]+\\) \\+\\([0-9]+\\),\\([0-9]+\\) @@" nil t)
        (let ((headno (string-to-number (match-string 1)))
              (headcnt (string-to-number (match-string 2)))
              (curno (string-to-number (match-string 3)))
              (curcnt (string-to-number (match-string 4))))
          (cl-assert (equal (- curno headno) last-offset))
          (and (null from-offset) (> curno lfrom)
               (setq from-offset last-offset))
          (and (null to-offset) (> curno lto)
               (setq to-offset last-offset))
          (setq last-offset
                (- (+ curno curcnt) (+ headno headcnt)))))
      (setq lto (- lto (or to-offset last-offset)))
      (setq lfrom (- lfrom (or to-offset last-offset)))))
  (vc-git-command buffer 'async nil "log" "-p" ;"--follow" ;FIXME: not supported?
                  (format "-L%d,%d:%s" lfrom lto (file-relative-name file))))

(require 'diff-mode)

(defvar vc-git-region-history-mode-map
  (let ((map (make-composed-keymap
              nil (make-composed-keymap
                   (list diff-mode-map vc-git-log-view-mode-map)))))
    map))

(defvar vc-git--log-view-long-font-lock-keywords nil)
(defvar font-lock-keywords)
(defvar vc-git-region-history-font-lock-keywords
  `((vc-git-region-history-font-lock)))

(defun vc-git-region-history-font-lock (limit)
  (let ((in-diff (save-excursion
                   (beginning-of-line)
                   (or (looking-at "^\\(?:diff\\|commit\\)\\>")
                       (re-search-backward "^\\(?:diff\\|commit\\)\\>" nil t))
                   (eq ?d (char-after (match-beginning 0))))))
    (while
        (let ((end (save-excursion
                     (if (re-search-forward "\n\\(diff\\|commit\\)\\>"
                                            limit t)
                         (match-beginning 1)
                       limit))))
          (let ((font-lock-keywords (if in-diff diff-font-lock-keywords
                                      vc-git--log-view-long-font-lock-keywords)))
            (font-lock-fontify-keywords-region (point) end))
          (goto-char end)
          (prog1 (< (point) limit)
            (setq in-diff (eq ?d (char-after))))))
    nil))

(define-derived-mode vc-git-region-history-mode
    vc-git-log-view-mode "Git-Region-History"
  "Major mode to browse Git's \"log -p\" output."
  (setq-local vc-git--log-view-long-font-lock-keywords
              log-view-font-lock-keywords)
  (setq-local font-lock-defaults
              (cons 'vc-git-region-history-font-lock-keywords
                    (cdr font-lock-defaults))))

(defun vc-git--asciify-coding-system ()
  ;; Try to reconcile the content encoding with the encoding of Git's
  ;; auxiliary output (which is ASCII or ASCII-compatible), bug#23595.
  (unless (let ((samp "Binary files differ"))
            (string-equal samp (decode-coding-string
                                samp coding-system-for-read t)))
    (setq coding-system-for-read 'undecided)))

(autoload 'vc-switches "vc")

(defun vc-git-diff (files &optional rev1 rev2 buffer _async)
  "Get a difference report using Git between two revisions of FILES."
  (let (process-file-side-effects
        (command "diff-tree"))
    (vc-git--asciify-coding-system)
    (if rev2
        ;; Diffing against the empty tree.
        (unless rev1 (setq rev1 "4b825dc642cb6eb9a060e54bf8d69288fbee4904"))
      (setq command "diff-index")
      (unless rev1 (setq rev1 "HEAD")))
    (if vc-git-diff-switches
        (apply #'vc-git-command (or buffer "*vc-diff*")
	       1 ; bug#21969
	       files
               command
               "--exit-code"
               (append (vc-switches 'git 'diff)
                       (list "-p" (or rev1 "HEAD") rev2 "--")))
      (vc-git-command (or buffer "*vc-diff*") 1 files
                      "difftool" "--exit-code" "--no-prompt" "-x"
                      (concat "diff "
                              (mapconcat 'identity
                                         (vc-switches nil 'diff) " "))
                      rev1 rev2 "--"))))

(defun vc-git-revision-table (_files)
  ;; What about `files'?!?  --Stef
  (let (process-file-side-effects
	(table (list "HEAD")))
    (with-temp-buffer
      (vc-git-command t nil nil "for-each-ref" "--format=%(refname)")
      (goto-char (point-min))
      (while (re-search-forward "^refs/\\(heads\\|tags\\|remotes\\)/\\(.*\\)$"
                                nil t)
        (push (match-string 2) table)))
    table))

(defun vc-git-revision-completion-table (files)
  (letrec ((table (lazy-completion-table
                   table (lambda () (vc-git-revision-table files)))))
    table))

(defun vc-git-annotate-command (file buf &optional rev)
  (vc-git--asciify-coding-system)
  (let ((name (file-relative-name file)))
    (apply #'vc-git-command buf 'async nil "blame" "--date=short"
	   (append (vc-switches 'git 'annotate)
		   (list rev "--" name)))))

(declare-function vc-annotate-convert-time "vc-annotate" (&optional time))

(defun vc-git-annotate-time ()
  (and (re-search-forward "^[0-9a-f^]+[^()]+(.*?\\([0-9]+\\)-\\([0-9]+\\)-\\([0-9]+\\) \\(:?\\([0-9]+\\):\\([0-9]+\\):\\([0-9]+\\) \\([-+0-9]+\\)\\)? *[0-9]+) " nil t)
       (vc-annotate-convert-time
        (apply #'encode-time (mapcar (lambda (match)
                                       (if (match-beginning match)
                                           (string-to-number (match-string match))
                                         0))
                                     '(6 5 4 3 2 1 7))))))

(defun vc-git-annotate-extract-revision-at-line ()
  (save-excursion
    (beginning-of-line)
    (when (looking-at "\\^?\\([0-9a-f]+\\) \\(\\([^(]+\\) \\)?")
      (let ((revision (match-string-no-properties 1)))
	(if (match-beginning 2)
	    (let ((fname (match-string-no-properties 3)))
	      ;; Remove trailing whitespace from the file name.
	      (when (string-match " +\\'" fname)
		(setq fname (substring fname 0 (match-beginning 0))))
	      (cons revision
		    (expand-file-name fname (vc-git-root default-directory))))
	  revision)))))

;;; TAG SYSTEM

(defun vc-git-create-tag (dir name branchp)
  (let ((default-directory dir))
    (and (vc-git-command nil 0 nil "update-index" "--refresh")
         (if branchp
             (vc-git-command nil 0 nil "checkout" "-b" name)
           (vc-git-command nil 0 nil "tag" name)))))

(defun vc-git-retrieve-tag (dir name _update)
  (let ((default-directory dir))
    (vc-git-command nil 0 nil "checkout" name)
    ;; FIXME: update buffers if `update' is true
    ))


;;; MISCELLANEOUS

(defun vc-git-previous-revision (file rev)
  "Git-specific version of `vc-previous-revision'."
  (if file
      (let* ((fname (file-relative-name file))
             (prev-rev (with-temp-buffer
                         (and
                          (vc-git--out-ok "rev-list" "-2" rev "--" fname)
                          (goto-char (point-max))
                          (bolp)
                          (zerop (forward-line -1))
                          (not (bobp))
                          (buffer-substring-no-properties
                           (point)
                           (1- (point-max)))))))
        (or (vc-git-symbolic-commit prev-rev) prev-rev))
    ;; We used to use "^" here, but that fails on MS-Windows if git is
    ;; invoked via a batch file, in which case cmd.exe strips the "^"
    ;; because it is a special character for cmd which process-file
    ;; does not (and cannot) quote.
    (vc-git--rev-parse (concat rev "~1"))))

(defun vc-git--rev-parse (rev)
  (with-temp-buffer
    (and
     (vc-git--out-ok "rev-parse" rev)
     (buffer-substring-no-properties (point-min) (+ (point-min) 40)))))

(defun vc-git-next-revision (file rev)
  "Git-specific version of `vc-next-revision'."
  (let* ((default-directory (file-name-directory
			     (expand-file-name file)))
         (file (file-name-nondirectory file))
         (current-rev
          (with-temp-buffer
            (and
             (vc-git--out-ok "rev-list" "-1" rev "--" file)
             (goto-char (point-max))
             (bolp)
             (zerop (forward-line -1))
             (bobp)
             (buffer-substring-no-properties
              (point)
              (1- (point-max))))))
         (next-rev
          (and current-rev
               (with-temp-buffer
                 (and
                  (vc-git--out-ok "rev-list" "HEAD" "--" file)
                  (goto-char (point-min))
                  (search-forward current-rev nil t)
                  (zerop (forward-line -1))
                  (buffer-substring-no-properties
                   (point)
                   (progn (forward-line 1) (1- (point)))))))))
    (or (vc-git-symbolic-commit next-rev) next-rev)))

(defun vc-git-delete-file (file)
  (vc-git-command nil 0 file "rm" "-f" "--"))

(defun vc-git-rename-file (old new)
  (vc-git-command nil 0 (list old new) "mv" "-f" "--"))

(defvar vc-git-extra-menu-map
  (let ((map (make-sparse-keymap)))
    (define-key map [git-grep]
      '(menu-item "Git grep..." vc-git-grep
		  :help "Run the `git grep' command"))
    (define-key map [git-sn]
      '(menu-item "Stash a Snapshot" vc-git-stash-snapshot
		  :help "Stash the current state of the tree and keep the current state"))
    (define-key map [git-st]
      '(menu-item "Create Stash..." vc-git-stash
		  :help "Stash away changes"))
    (define-key map [git-ss]
      '(menu-item "Show Stash..." vc-git-stash-show
		  :help "Show stash contents"))
    map))

(defun vc-git-extra-menu () vc-git-extra-menu-map)

(defun vc-git-extra-status-menu () vc-git-extra-menu-map)

(defun vc-git-root (file)
  (or (vc-file-getprop file 'git-root)
      (vc-file-setprop file 'git-root (vc-find-root file ".git"))))

;; grep-compute-defaults autoloads grep.
(declare-function grep-read-regexp "grep" ())
(declare-function grep-read-files "grep" (regexp))
(declare-function grep-expand-template "grep"
                 (template &optional regexp files dir excl))

;; Derived from `lgrep'.
(defun vc-git-grep (regexp &optional files dir)
  "Run git grep, searching for REGEXP in FILES in directory DIR.
The search is limited to file names matching shell pattern FILES.
FILES may use abbreviations defined in `grep-files-aliases', e.g.
entering `ch' is equivalent to `*.[ch]'.

With \\[universal-argument] prefix, you can edit the constructed shell command line
before it is executed.
With two \\[universal-argument] prefixes, directly edit and run `grep-command'.

Collect output in a buffer.  While git grep runs asynchronously, you
can use \\[next-error] (M-x next-error), or \\<grep-mode-map>\\[compile-goto-error] \
in the grep output buffer,
to go to the lines where grep found matches.

This command shares argument histories with \\[rgrep] and \\[grep]."
  (interactive
   (progn
     (grep-compute-defaults)
     (cond
      ((equal current-prefix-arg '(16))
       (list (read-from-minibuffer "Run: " "git grep"
				   nil nil 'grep-history)
	     nil))
      (t (let* ((regexp (grep-read-regexp))
		(files (grep-read-files regexp))
		(dir (read-directory-name "In directory: "
					  nil default-directory t)))
	   (list regexp files dir))))))
  (require 'grep)
  (when (and (stringp regexp) (> (length regexp) 0))
    (let ((command regexp))
      (if (null files)
	  (if (string= command "git grep")
	      (setq command nil))
	(setq dir (file-name-as-directory (expand-file-name dir)))
	(setq command
	      (grep-expand-template "git --no-pager grep -n -e <R> -- <F>"
                                    regexp files))
	(when command
	  (if (equal current-prefix-arg '(4))
	      (setq command
		    (read-from-minibuffer "Confirm: "
					  command nil nil 'grep-history))
	    (add-to-history 'grep-history command))))
      (when command
	(let ((default-directory dir)
	      (compilation-environment (cons "PAGER=" compilation-environment)))
	  ;; Setting process-setup-function makes exit-message-function work
	  ;; even when async processes aren't supported.
	  (compilation-start command 'grep-mode))
	(if (eq next-error-last-buffer (current-buffer))
	    (setq default-directory dir))))))

;; Everywhere but here, follows vc-git-command, which uses vc-do-command
;; from vc-dispatcher.
(autoload 'vc-resynch-buffer "vc-dispatcher")

(defun vc-git-stash (name)
  "Create a stash."
  (interactive "sStash name: ")
  (let ((root (vc-git-root default-directory)))
    (when root
      (vc-git--call nil "stash" "save" name)
      (vc-resynch-buffer root t t))))

(defun vc-git-stash-show (name)
  "Show the contents of stash NAME."
  (interactive "sStash name: ")
  (vc-setup-buffer "*vc-git-stash*")
  (vc-git-command "*vc-git-stash*" 'async nil "stash" "show" "-p" name)
  (set-buffer "*vc-git-stash*")
  (diff-mode)
  (setq buffer-read-only t)
  (pop-to-buffer (current-buffer)))

(defun vc-git-stash-apply (name)
  "Apply stash NAME."
  (interactive "sApply stash: ")
  (vc-git-command "*vc-git-stash*" 0 nil "stash" "apply" "-q" name)
  (vc-resynch-buffer (vc-git-root default-directory) t t))

(defun vc-git-stash-pop (name)
  "Pop stash NAME."
  (interactive "sPop stash: ")
  (vc-git-command "*vc-git-stash*" 0 nil "stash" "pop" "-q" name)
  (vc-resynch-buffer (vc-git-root default-directory) t t))

(defun vc-git-stash-snapshot ()
  "Create a stash with the current tree state."
  (interactive)
  (vc-git--call nil "stash" "save"
		(let ((ct (current-time)))
		  (concat
		   (format-time-string "Snapshot on %Y-%m-%d" ct)
		   (format-time-string " at %H:%M" ct))))
  (vc-git-command "*vc-git-stash*" 0 nil "stash" "apply" "-q" "stash@{0}")
  (vc-resynch-buffer (vc-git-root default-directory) t t))

(defun vc-git-stash-list ()
  (delete
   ""
   (split-string
    (replace-regexp-in-string
     "^stash@" "             " (vc-git--run-command-string nil "stash" "list"))
    "\n")))

(defun vc-git-stash-get-at-point (point)
  (save-excursion
    (goto-char point)
    (beginning-of-line)
    (if (looking-at "^ +\\({[0-9]+}\\):")
	(match-string 1)
      (error "Cannot find stash at point"))))

;; vc-git-stash-delete-at-point must be called from a vc-dir buffer.
(declare-function vc-dir-refresh "vc-dir" ())

(defun vc-git-stash-delete-at-point ()
  (interactive)
  (let ((stash (vc-git-stash-get-at-point (point))))
    (when (y-or-n-p (format "Remove stash %s ? " stash))
      (vc-git--run-command-string nil "stash" "drop" (format "stash@%s" stash))
      (vc-dir-refresh))))

(defun vc-git-stash-show-at-point ()
  (interactive)
  (vc-git-stash-show (format "stash@%s" (vc-git-stash-get-at-point (point)))))

(defun vc-git-stash-apply-at-point ()
  (interactive)
  (let (vc-dir-buffers) ; Small optimization.
    (vc-git-stash-apply (format "stash@%s" (vc-git-stash-get-at-point (point)))))
  (vc-dir-refresh))

(defun vc-git-stash-pop-at-point ()
  (interactive)
  (let (vc-dir-buffers) ; Likewise.
    (vc-git-stash-pop (format "stash@%s" (vc-git-stash-get-at-point (point)))))
  (vc-dir-refresh))

(defun vc-git-stash-menu (e)
  (interactive "e")
  (vc-dir-at-event e (popup-menu vc-git-stash-menu-map e)))


;;; Internal commands

(defun vc-git-command (buffer okstatus file-or-list &rest flags)
  "A wrapper around `vc-do-command' for use in vc-git.el.
The difference to vc-do-command is that this function always invokes
`vc-git-program'."
  (let ((coding-system-for-read
         (or coding-system-for-read vc-git-log-output-coding-system))
	(coding-system-for-write
         (or coding-system-for-write vc-git-commits-coding-system))
        (process-environment (cons "GIT_DIR" process-environment)))
    (apply 'vc-do-command (or buffer "*vc*") okstatus vc-git-program
	   ;; http://debbugs.gnu.org/16897
	   (unless (and (not (cdr-safe file-or-list))
			(let ((file (or (car-safe file-or-list)
					file-or-list)))
			  (and file
			       (eq ?/ (aref file (1- (length file))))
			       (equal file (vc-git-root file)))))
	     file-or-list)
	   (cons "--no-pager" flags))))

(defun vc-git--empty-db-p ()
  "Check if the git db is empty (no commit done yet)."
  (let (process-file-side-effects)
    (not (eq 0 (vc-git--call nil "rev-parse" "--verify" "HEAD")))))

(defun vc-git--call (buffer command &rest args)
  ;; We don't need to care the arguments.  If there is a file name, it
  ;; is always a relative one.  This works also for remote
  ;; directories.  We enable `inhibit-null-byte-detection', otherwise
  ;; Tramp's eol conversion might be confused.
  (let ((inhibit-null-byte-detection t)
	(coding-system-for-read
         (or coding-system-for-read vc-git-log-output-coding-system))
	(coding-system-for-write
         (or coding-system-for-write vc-git-commits-coding-system))
	(process-environment (cons "PAGER=" process-environment)))
    (push "GIT_DIR" process-environment)
    (apply 'process-file vc-git-program nil buffer nil command args)))

(defun vc-git--out-ok (command &rest args)
  (zerop (apply 'vc-git--call '(t nil) command args)))

(defun vc-git--run-command-string (file &rest args)
  "Run a git command on FILE and return its output as string.
FILE can be nil."
  (let* ((ok t)
         (str (with-output-to-string
                (with-current-buffer standard-output
                  (unless (apply 'vc-git--out-ok
				 (if file
				     (append args (list (file-relative-name
							 file)))
				   args))
                    (setq ok nil))))))
    (and ok str)))

(defun vc-git-symbolic-commit (commit)
  "Translate COMMIT string into symbolic form.
Returns nil if not possible."
  (and commit
       (let ((name (with-temp-buffer
                     (and
                      (vc-git--out-ok "name-rev" "--name-only" commit)
                      (goto-char (point-min))
                      (= (forward-line 2) 1)
                      (bolp)
                      (buffer-substring-no-properties (point-min)
                                                      (1- (point-max)))))))
         (and name (not (string= name "undefined")) name))))

(provide 'vc-git)

;;; vc-git.el ends here