aboutsummaryrefslogtreecommitdiff
path: root/contrib/emacs/git.el
blob: 8c70ad8b7f462c7f87224798485a5ea46a865622 (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
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
;;; git.el --- A user interface for git

;; Copyright (C) 2005, 2006, 2007, 2008, 2009 Alexandre Julliard <julliard@winehq.org>

;; Version: 1.0

;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2 of
;; the License, or (at your option) any later version.
;;
;; This program is distributed in the hope that it will be
;; useful, but WITHOUT ANY WARRANTY; without even the implied
;; warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;; PURPOSE.  See the GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public
;; License along with this program; if not, write to the Free
;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
;; MA 02111-1307 USA

;;; Commentary:

;; This file contains an interface for the git version control
;; system. It provides easy access to the most frequently used git
;; commands. The user interface is as far as possible identical to
;; that of the PCL-CVS mode.
;;
;; To install: put this file on the load-path and place the following
;; in your .emacs file:
;;
;;    (require 'git)
;;
;; To start: `M-x git-status'
;;
;; TODO
;;  - diff against other branch
;;  - renaming files from the status buffer
;;  - creating tags
;;  - fetch/pull
;;  - revlist browser
;;  - git-show-branch browser
;;

;;; Compatibility:
;;
;; This file works on GNU Emacs 21 or later. It may work on older
;; versions but this is not guaranteed.
;;
;; It may work on XEmacs 21, provided that you first install the ewoc
;; and log-edit packages.
;;

(eval-when-compile (require 'cl))
(require 'ewoc)
(require 'log-edit)
(require 'easymenu)


;;;; Customizations
;;;; ------------------------------------------------------------

(defgroup git nil
  "A user interface for the git versioning system."
  :group 'tools)

(defcustom git-committer-name nil
  "User name to use for commits.
The default is to fall back to the repository config,
then to `add-log-full-name' and then to `user-full-name'."
  :group 'git
  :type '(choice (const :tag "Default" nil)
                 (string :tag "Name")))

(defcustom git-committer-email nil
  "Email address to use for commits.
The default is to fall back to the git repository config,
then to `add-log-mailing-address' and then to `user-mail-address'."
  :group 'git
  :type '(choice (const :tag "Default" nil)
                 (string :tag "Email")))

(defcustom git-commits-coding-system nil
  "Default coding system for the log message of git commits."
  :group 'git
  :type '(choice (const :tag "From repository config" nil)
                 (coding-system)))

(defcustom git-append-signed-off-by nil
  "Whether to append a Signed-off-by line to the commit message before editing."
  :group 'git
  :type 'boolean)

(defcustom git-reuse-status-buffer t
  "Whether `git-status' should try to reuse an existing buffer
if there is already one that displays the same directory."
  :group 'git
  :type 'boolean)

(defcustom git-per-dir-ignore-file ".gitignore"
  "Name of the per-directory ignore file."
  :group 'git
  :type 'string)

(defcustom git-show-uptodate nil
  "Whether to display up-to-date files."
  :group 'git
  :type 'boolean)

(defcustom git-show-ignored nil
  "Whether to display ignored files."
  :group 'git
  :type 'boolean)

(defcustom git-show-unknown t
  "Whether to display unknown files."
  :group 'git
  :type 'boolean)


(defface git-status-face
  '((((class color) (background light)) (:foreground "purple"))
    (((class color) (background dark)) (:foreground "salmon")))
  "Git mode face used to highlight added and modified files."
  :group 'git)

(defface git-unmerged-face
  '((((class color) (background light)) (:foreground "red" :bold t))
    (((class color) (background dark)) (:foreground "red" :bold t)))
  "Git mode face used to highlight unmerged files."
  :group 'git)

(defface git-unknown-face
  '((((class color) (background light)) (:foreground "goldenrod" :bold t))
    (((class color) (background dark)) (:foreground "goldenrod" :bold t)))
  "Git mode face used to highlight unknown files."
  :group 'git)

(defface git-uptodate-face
  '((((class color) (background light)) (:foreground "grey60"))
    (((class color) (background dark)) (:foreground "grey40")))
  "Git mode face used to highlight up-to-date files."
  :group 'git)

(defface git-ignored-face
  '((((class color) (background light)) (:foreground "grey60"))
    (((class color) (background dark)) (:foreground "grey40")))
  "Git mode face used to highlight ignored files."
  :group 'git)

(defface git-mark-face
  '((((class color) (background light)) (:foreground "red" :bold t))
    (((class color) (background dark)) (:foreground "tomato" :bold t)))
  "Git mode face used for the file marks."
  :group 'git)

(defface git-header-face
  '((((class color) (background light)) (:foreground "blue"))
    (((class color) (background dark)) (:foreground "blue")))
  "Git mode face used for commit headers."
  :group 'git)

(defface git-separator-face
  '((((class color) (background light)) (:foreground "brown"))
    (((class color) (background dark)) (:foreground "brown")))
  "Git mode face used for commit separator."
  :group 'git)

(defface git-permission-face
  '((((class color) (background light)) (:foreground "green" :bold t))
    (((class color) (background dark)) (:foreground "green" :bold t)))
  "Git mode face used for permission changes."
  :group 'git)


;;;; Utilities
;;;; ------------------------------------------------------------

(defconst git-log-msg-separator "--- log message follows this line ---")

(defvar git-log-edit-font-lock-keywords
  `(("^\\(Author:\\|Date:\\|Merge:\\|Signed-off-by:\\)\\(.*\\)$"
     (1 font-lock-keyword-face)
     (2 font-lock-function-name-face))
    (,(concat "^\\(" (regexp-quote git-log-msg-separator) "\\)$")
     (1 font-lock-comment-face))))

(defun git-get-env-strings (env)
  "Build a list of NAME=VALUE strings from a list of environment strings."
  (mapcar (lambda (entry) (concat (car entry) "=" (cdr entry))) env))

(defun git-call-process (buffer &rest args)
  "Wrapper for call-process that sets environment strings."
  (apply #'call-process "git" nil buffer nil args))

(defun git-call-process-display-error (&rest args)
  "Wrapper for call-process that displays error messages."
  (let* ((dir default-directory)
         (buffer (get-buffer-create "*Git Command Output*"))
         (ok (with-current-buffer buffer
               (let ((default-directory dir)
                     (buffer-read-only nil))
                 (erase-buffer)
                 (eq 0 (apply #'git-call-process (list buffer t) args))))))
    (unless ok (display-message-or-buffer buffer))
    ok))

(defun git-call-process-string (&rest args)
  "Wrapper for call-process that returns the process output as a string,
or nil if the git command failed."
  (with-temp-buffer
    (and (eq 0 (apply #'git-call-process t args))
         (buffer-string))))

(defun git-call-process-string-display-error (&rest args)
  "Wrapper for call-process that displays error message and returns
the process output as a string, or nil if the git command failed."
  (with-temp-buffer
    (if (eq 0 (apply #'git-call-process (list t t) args))
        (buffer-string)
      (display-message-or-buffer (current-buffer))
      nil)))

(defun git-run-process-region (buffer start end program args)
  "Run a git process with a buffer region as input."
  (let ((output-buffer (current-buffer))
        (dir default-directory))
    (with-current-buffer buffer
      (cd dir)
      (apply #'call-process-region start end program
             nil (list output-buffer t) nil args))))

(defun git-run-command-buffer (buffer-name &rest args)
  "Run a git command, sending the output to a buffer named BUFFER-NAME."
  (let ((dir default-directory)
        (buffer (get-buffer-create buffer-name)))
    (message "Running git %s..." (car args))
    (with-current-buffer buffer
      (let ((default-directory dir)
            (buffer-read-only nil))
        (erase-buffer)
        (apply #'git-call-process buffer args)))
    (message "Running git %s...done" (car args))
    buffer))

(defun git-run-command-region (buffer start end env &rest args)
  "Run a git command with specified buffer region as input."
  (with-temp-buffer
    (if (eq 0 (if env
                  (git-run-process-region
                   buffer start end "env"
                   (append (git-get-env-strings env) (list "git") args))
                (git-run-process-region buffer start end "git" args)))
        (buffer-string)
      (display-message-or-buffer (current-buffer))
      nil)))

(defun git-run-hook (hook env &rest args)
  "Run a git hook and display its output if any."
  (let ((dir default-directory)
        (hook-name (expand-file-name (concat ".git/hooks/" hook))))
    (or (not (file-executable-p hook-name))
        (let (status (buffer (get-buffer-create "*Git Hook Output*")))
          (with-current-buffer buffer
            (erase-buffer)
            (cd dir)
            (setq status
                  (if env
                      (apply #'call-process "env" nil (list buffer t) nil
                             (append (git-get-env-strings env) (list hook-name) args))
                    (apply #'call-process hook-name nil (list buffer t) nil args))))
          (display-message-or-buffer buffer)
          (eq 0 status)))))

(defun git-get-string-sha1 (string)
  "Read a SHA1 from the specified string."
  (and string
       (string-match "[0-9a-f]\\{40\\}" string)
       (match-string 0 string)))

(defun git-get-committer-name ()
  "Return the name to use as GIT_COMMITTER_NAME."
  ; copied from log-edit
  (or git-committer-name
      (git-config "user.name")
      (and (boundp 'add-log-full-name) add-log-full-name)
      (and (fboundp 'user-full-name) (user-full-name))
      (and (boundp 'user-full-name) user-full-name)))

(defun git-get-committer-email ()
  "Return the email address to use as GIT_COMMITTER_EMAIL."
  ; copied from log-edit
  (or git-committer-email
      (git-config "user.email")
      (and (boundp 'add-log-mailing-address) add-log-mailing-address)
      (and (fboundp 'user-mail-address) (user-mail-address))
      (and (boundp 'user-mail-address) user-mail-address)))

(defun git-get-commits-coding-system ()
  "Return the coding system to use for commits."
  (let ((repo-config (git-config "i18n.commitencoding")))
    (or git-commits-coding-system
        (and repo-config
             (fboundp 'locale-charset-to-coding-system)
             (locale-charset-to-coding-system repo-config))
      'utf-8)))

(defun git-get-logoutput-coding-system ()
  "Return the coding system used for git-log output."
  (let ((repo-config (or (git-config "i18n.logoutputencoding")
                         (git-config "i18n.commitencoding"))))
    (or git-commits-coding-system
        (and repo-config
             (fboundp 'locale-charset-to-coding-system)
             (locale-charset-to-coding-system repo-config))
      'utf-8)))

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

(defun git-success-message (text files)
  "Print a success message after having handled FILES."
  (let ((n (length files)))
    (if (equal n 1)
        (message "%s %s" text (car files))
      (message "%s %d files" text n))))

(defun git-get-top-dir (dir)
  "Retrieve the top-level directory of a git tree."
  (let ((cdup (with-output-to-string
                (with-current-buffer standard-output
                  (cd dir)
                  (unless (eq 0 (git-call-process t "rev-parse" "--show-cdup"))
                    (error "cannot find top-level git tree for %s." dir))))))
    (expand-file-name (concat (file-name-as-directory dir)
                              (car (split-string cdup "\n"))))))

;stolen from pcl-cvs
(defun git-append-to-ignore (file)
  "Add a file name to the ignore file in its directory."
  (let* ((fullname (expand-file-name file))
         (dir (file-name-directory fullname))
         (name (file-name-nondirectory fullname))
         (ignore-name (expand-file-name git-per-dir-ignore-file dir))
         (created (not (file-exists-p ignore-name))))
  (save-window-excursion
    (set-buffer (find-file-noselect ignore-name))
    (goto-char (point-max))
    (unless (zerop (current-column)) (insert "\n"))
    (insert "/" name "\n")
    (sort-lines nil (point-min) (point-max))
    (save-buffer))
  (when created
    (git-call-process nil "update-index" "--add" "--" (file-relative-name ignore-name)))
  (git-update-status-files (list (file-relative-name ignore-name)))))

; propertize definition for XEmacs, stolen from erc-compat
(eval-when-compile
  (unless (fboundp 'propertize)
    (defun propertize (string &rest props)
      (let ((string (copy-sequence string)))
        (while props
          (put-text-property 0 (length string) (nth 0 props) (nth 1 props) string)
          (setq props (cddr props)))
        string))))

;;;; Wrappers for basic git commands
;;;; ------------------------------------------------------------

(defun git-rev-parse (rev)
  "Parse a revision name and return its SHA1."
  (git-get-string-sha1
   (git-call-process-string "rev-parse" rev)))

(defun git-config (key)
  "Retrieve the value associated to KEY in the git repository config file."
  (let ((str (git-call-process-string "config" key)))
    (and str (car (split-string str "\n")))))

(defun git-symbolic-ref (ref)
  "Wrapper for the git-symbolic-ref command."
  (let ((str (git-call-process-string "symbolic-ref" ref)))
    (and str (car (split-string str "\n")))))

(defun git-update-ref (ref newval &optional oldval reason)
  "Update a reference by calling git-update-ref."
  (let ((args (and oldval (list oldval))))
    (when newval (push newval args))
    (push ref args)
    (when reason
     (push reason args)
     (push "-m" args))
    (unless newval (push "-d" args))
    (apply 'git-call-process-display-error "update-ref" args)))

(defun git-for-each-ref (&rest specs)
  "Return a list of refs using git-for-each-ref.
Each entry is a cons of (SHORT-NAME . FULL-NAME)."
  (let (refs)
    (with-temp-buffer
      (apply #'git-call-process t "for-each-ref" "--format=%(refname)" specs)
      (goto-char (point-min))
      (while (re-search-forward "^[^/\n]+/[^/\n]+/\\(.+\\)$" nil t)
	(push (cons (match-string 1) (match-string 0)) refs)))
    (nreverse refs)))

(defun git-read-tree (tree &optional index-file)
  "Read a tree into the index file."
  (let ((process-environment
         (append (and index-file (list (concat "GIT_INDEX_FILE=" index-file))) process-environment)))
    (apply 'git-call-process-display-error "read-tree" (if tree (list tree)))))

(defun git-write-tree (&optional index-file)
  "Call git-write-tree and return the resulting tree SHA1 as a string."
  (let ((process-environment
         (append (and index-file (list (concat "GIT_INDEX_FILE=" index-file))) process-environment)))
    (git-get-string-sha1
     (git-call-process-string-display-error "write-tree"))))

(defun git-commit-tree (buffer tree parent)
  "Create a commit and possibly update HEAD.
Create a commit with the message in BUFFER using the tree with hash TREE.
Use PARENT as the parent of the new commit. If PARENT is the current \"HEAD\",
update the \"HEAD\" reference to the new commit."
  (let ((author-name (git-get-committer-name))
        (author-email (git-get-committer-email))
        (subject "commit (initial): ")
        author-date log-start log-end args coding-system-for-write)
    (when parent
      (setq subject "commit: ")
      (push "-p" args)
      (push parent args))
    (with-current-buffer buffer
      (goto-char (point-min))
      (if
          (setq log-start (re-search-forward (concat "^" (regexp-quote git-log-msg-separator) "\n") nil t))
          (save-restriction
            (narrow-to-region (point-min) log-start)
            (goto-char (point-min))
            (when (re-search-forward "^Author: +\\(.*?\\) *<\\(.*\\)> *$" nil t)
              (setq author-name (match-string 1)
                    author-email (match-string 2)))
            (goto-char (point-min))
            (when (re-search-forward "^Date: +\\(.*\\)$" nil t)
              (setq author-date (match-string 1)))
            (goto-char (point-min))
            (when (re-search-forward "^Merge: +\\(.*\\)" nil t)
              (setq subject "commit (merge): ")
              (dolist (parent (split-string (match-string 1) " +" t))
                (push "-p" args)
                (push parent args))))
        (setq log-start (point-min)))
      (setq log-end (point-max))
      (goto-char log-start)
      (when (re-search-forward ".*$" nil t)
        (setq subject (concat subject (match-string 0))))
      (setq coding-system-for-write buffer-file-coding-system))
    (let ((commit
           (git-get-string-sha1
            (let ((env `(("GIT_AUTHOR_NAME" . ,author-name)
                         ("GIT_AUTHOR_EMAIL" . ,author-email)
                         ("GIT_COMMITTER_NAME" . ,(git-get-committer-name))
                         ("GIT_COMMITTER_EMAIL" . ,(git-get-committer-email)))))
              (when author-date (push `("GIT_AUTHOR_DATE" . ,author-date) env))
              (apply #'git-run-command-region
                     buffer log-start log-end env
                     "commit-tree" tree (nreverse args))))))
      (when commit (git-update-ref "HEAD" commit parent subject))
      commit)))

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

(defun git-get-merge-heads ()
  "Retrieve the merge heads from the MERGE_HEAD file if present."
  (let (heads)
    (when (file-readable-p ".git/MERGE_HEAD")
      (with-temp-buffer
        (insert-file-contents ".git/MERGE_HEAD" nil nil nil t)
        (goto-char (point-min))
        (while (re-search-forward "[0-9a-f]\\{40\\}" nil t)
          (push (match-string 0) heads))))
    (nreverse heads)))

(defun git-get-commit-description (commit)
  "Get a one-line description of COMMIT."
  (let ((coding-system-for-read (git-get-logoutput-coding-system)))
    (let ((descr (git-call-process-string "log" "--max-count=1" "--pretty=oneline" commit)))
      (if (and descr (string-match "\\`\\([0-9a-f]\\{40\\}\\) *\\(.*\\)$" descr))
          (concat (substring (match-string 1 descr) 0 10) " - " (match-string 2 descr))
        descr))))

;;;; File info structure
;;;; ------------------------------------------------------------

; fileinfo structure stolen from pcl-cvs
(defstruct (git-fileinfo
            (:copier nil)
            (:constructor git-create-fileinfo (state name &optional old-perm new-perm rename-state orig-name marked))
            (:conc-name git-fileinfo->))
  marked              ;; t/nil
  state               ;; current state
  name                ;; file name
  old-perm new-perm   ;; permission flags
  rename-state        ;; rename or copy state
  orig-name           ;; original name for renames or copies
  needs-update        ;; whether file needs to be updated
  needs-refresh)      ;; whether file needs to be refreshed

(defvar git-status nil)

(defun git-set-fileinfo-state (info state)
  "Set the state of a file info."
  (unless (eq (git-fileinfo->state info) state)
    (setf (git-fileinfo->state info) state
	  (git-fileinfo->new-perm info) (git-fileinfo->old-perm info)
          (git-fileinfo->rename-state info) nil
          (git-fileinfo->orig-name info) nil
          (git-fileinfo->needs-update info) nil
          (git-fileinfo->needs-refresh info) t)))

(defun git-status-filenames-map (status func files &rest args)
  "Apply FUNC to the status files names in the FILES list.
The list must be sorted."
  (when files
    (let ((file (pop files))
          (node (ewoc-nth status 0)))
      (while (and file node)
        (let* ((info (ewoc-data node))
               (name (git-fileinfo->name info)))
          (if (string-lessp name file)
              (setq node (ewoc-next status node))
            (if (string-equal name file)
                (apply func info args))
            (setq file (pop files))))))))

(defun git-set-filenames-state (status files state)
  "Set the state of a list of named files. The list must be sorted"
  (when files
    (git-status-filenames-map status #'git-set-fileinfo-state files state)
    (unless state  ;; delete files whose state has been set to nil
      (ewoc-filter status (lambda (info) (git-fileinfo->state info))))))

(defun git-state-code (code)
  "Convert from a string to a added/deleted/modified state."
  (case (string-to-char code)
    (?M 'modified)
    (?? 'unknown)
    (?A 'added)
    (?D 'deleted)
    (?U 'unmerged)
    (?T 'modified)
    (t nil)))

(defun git-status-code-as-string (code)
  "Format a git status code as string."
  (case code
    ('modified (propertize "Modified" 'face 'git-status-face))
    ('unknown  (propertize "Unknown " 'face 'git-unknown-face))
    ('added    (propertize "Added   " 'face 'git-status-face))
    ('deleted  (propertize "Deleted " 'face 'git-status-face))
    ('unmerged (propertize "Unmerged" 'face 'git-unmerged-face))
    ('uptodate (propertize "Uptodate" 'face 'git-uptodate-face))
    ('ignored  (propertize "Ignored " 'face 'git-ignored-face))
    (t "?       ")))

(defun 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 (case new-type
		(64  ;; file
		 (case old-type
		   (64 nil)
		   (80 "   (type change symlink -> file)")
		   (112 "   (type change subproject -> file)")))
		 (80  ;; symlink
		  (case old-type
		    (64 "   (type change file -> symlink)")
		    (112 "   (type change subproject -> symlink)")
		    (t "   (symlink)")))
		  (112  ;; subproject
		   (case old-type
		     (64 "   (type change file -> subproject)")
		     (80 "   (type change symlink -> subproject)")
		     (t "   (subproject)")))
                  (72 nil)  ;; directory (internal, not a real git state)
		  (0  ;; deleted or unknown
		   (case old-type
		     (80 "   (symlink)")
		     (112 "   (subproject)")))
		  (t (format "   (unknown type %o)" new-type)))))
    (cond (str (propertize str 'face 'git-status-face))
          ((eq new-type 72) "/")
          (t ""))))

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

(defun 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 'git-permission-face))

(defun git-fileinfo-prettyprint (info)
  "Pretty-printer for the git-fileinfo structure."
  (let ((old-perm (git-fileinfo->old-perm info))
	(new-perm (git-fileinfo->new-perm info)))
    (insert (concat "   " (if (git-fileinfo->marked info) (propertize "*" 'face 'git-mark-face) " ")
		    " " (git-status-code-as-string (git-fileinfo->state info))
		    " " (git-permissions-as-string old-perm new-perm)
		    "  " (git-escape-file-name (git-fileinfo->name info))
		    (git-file-type-as-string old-perm new-perm)
		    (git-rename-as-string info)))))

(defun git-update-node-fileinfo (node info)
  "Update the fileinfo of the specified node. The names are assumed to match already."
  (let ((data (ewoc-data node)))
    (setf
     ;; preserve the marked flag
     (git-fileinfo->marked info) (git-fileinfo->marked data)
     (git-fileinfo->needs-update data) nil)
    (when (not (equal info data))
      (setf (git-fileinfo->needs-refresh info) t
            (ewoc-data node) info))))

(defun git-insert-info-list (status infolist files)
  "Insert a sorted list of file infos in the status buffer, replacing existing ones if any."
  (let* ((info (pop infolist))
         (node (ewoc-nth status 0))
         (name (and info (git-fileinfo->name info)))
         remaining)
    (while info
      (let ((nodename (and node (git-fileinfo->name (ewoc-data node)))))
        (while (and files (string-lessp (car files) name))
          (push (pop files) remaining))
        (when (and files (string-equal (car files) name))
          (setq files (cdr files)))
        (cond ((not nodename)
               (setq node (ewoc-enter-last status info))
               (setq info (pop infolist))
               (setq name (and info (git-fileinfo->name info))))
              ((string-lessp nodename name)
               (setq node (ewoc-next status node)))
              ((string-equal nodename name)
               ;; preserve the marked flag
               (git-update-node-fileinfo node info)
               (setq info (pop infolist))
               (setq name (and info (git-fileinfo->name info))))
              (t
               (setq node (ewoc-enter-before status node info))
               (setq info (pop infolist))
               (setq name (and info (git-fileinfo->name info)))))))
    (nconc (nreverse remaining) files)))

(defun git-run-diff-index (status files)
  "Run git-diff-index on FILES and parse the results into STATUS.
Return the list of files that haven't been handled."
  (let (infolist)
    (with-temp-buffer
      (apply #'git-call-process t "diff-index" "-z" "-M" "HEAD" "--" files)
      (goto-char (point-min))
      (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 (git-create-fileinfo 'added new-name old-perm new-perm 'copy name) infolist)
                (push (git-create-fileinfo 'deleted name 0 0 'rename new-name) infolist)
                (push (git-create-fileinfo 'added new-name old-perm new-perm 'rename name) infolist))
            (push (git-create-fileinfo (git-state-code state) name old-perm new-perm) infolist)))))
    (setq infolist (sort (nreverse infolist)
                         (lambda (info1 info2)
                           (string-lessp (git-fileinfo->name info1)
                                         (git-fileinfo->name info2)))))
    (git-insert-info-list status infolist files)))

(defun git-find-status-file (status file)
  "Find a given file in the status ewoc and return its node."
  (let ((node (ewoc-nth status 0)))
    (while (and node (not (string= file (git-fileinfo->name (ewoc-data node)))))
      (setq node (ewoc-next status node)))
    node))

(defun git-run-ls-files (status files default-state &rest options)
  "Run git-ls-files on FILES and parse the results into STATUS.
Return the list of files that haven't been handled."
  (let (infolist)
    (with-temp-buffer
      (apply #'git-call-process t "ls-files" "-z" (append options (list "--") files))
      (goto-char (point-min))
      (while (re-search-forward "\\([^\0]*?\\)\\(/?\\)\0" nil t 1)
        (let ((name (match-string 1)))
          (push (git-create-fileinfo default-state name 0
                                     (if (string-equal "/" (match-string 2)) (lsh ?\110 9) 0))
                infolist))))
    (setq infolist (nreverse infolist))  ;; assume it is sorted already
    (git-insert-info-list status infolist files)))

(defun git-run-ls-files-cached (status files default-state)
  "Run git-ls-files -c on FILES and parse the results into STATUS.
Return the list of files that haven't been handled."
  (let (infolist)
    (with-temp-buffer
      (apply #'git-call-process t "ls-files" "-z" "-s" "-c" "--" files)
      (goto-char (point-min))
      (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))
	       (old-perm (if (eq default-state 'added) 0 new-perm))
	       (name (match-string 2)))
	  (push (git-create-fileinfo default-state name old-perm new-perm) infolist))))
    (setq infolist (nreverse infolist))  ;; assume it is sorted already
    (git-insert-info-list status infolist files)))

(defun git-run-ls-unmerged (status files)
  "Run git-ls-files -u on FILES and parse the results into STATUS."
  (with-temp-buffer
    (apply #'git-call-process t "ls-files" "-z" "-u" "--" files)
    (goto-char (point-min))
    (let (unmerged-files)
      (while (re-search-forward "[0-7]\\{6\\} [0-9a-f]\\{40\\} [123]\t\\([^\0]+\\)\0" nil t)
        (push (match-string 1) unmerged-files))
      (setq unmerged-files (nreverse unmerged-files))  ;; assume it is sorted already
      (git-set-filenames-state status unmerged-files 'unmerged))))

(defun git-get-exclude-files ()
  "Get the list of exclude files to pass to git-ls-files."
  (let (files
        (config (git-config "core.excludesfile")))
    (when (file-readable-p ".git/info/exclude")
      (push ".git/info/exclude" files))
    (when (and config (file-readable-p config))
      (push config files))
    files))

(defun git-run-ls-files-with-excludes (status files default-state &rest options)
  "Run git-ls-files on FILES with appropriate --exclude-from options."
  (let ((exclude-files (git-get-exclude-files)))
    (apply #'git-run-ls-files status files default-state "--directory" "--no-empty-directory"
           (concat "--exclude-per-directory=" git-per-dir-ignore-file)
           (append options (mapcar (lambda (f) (concat "--exclude-from=" f)) exclude-files)))))

(defun git-update-status-files (&optional files mark-files)
  "Update the status of FILES from the index.
The FILES list must be sorted."
  (unless git-status (error "Not in git-status buffer."))
  ;; set the needs-update flag on existing files
  (if files
      (git-status-filenames-map
       git-status (lambda (info) (setf (git-fileinfo->needs-update info) t)) files)
    (ewoc-map (lambda (info) (setf (git-fileinfo->needs-update info) t) nil) git-status)
    (git-call-process nil "update-index" "--refresh")
    (when git-show-uptodate
      (git-run-ls-files-cached git-status nil 'uptodate)))
  (let ((remaining-files
          (if (git-empty-db-p) ; we need some special handling for an empty db
	      (git-run-ls-files-cached git-status files 'added)
            (git-run-diff-index git-status files))))
    (git-run-ls-unmerged git-status files)
    (when (or remaining-files (and git-show-unknown (not files)))
      (setq remaining-files (git-run-ls-files-with-excludes git-status remaining-files 'unknown "-o")))
    (when (or remaining-files (and git-show-ignored (not files)))
      (setq remaining-files (git-run-ls-files-with-excludes git-status remaining-files 'ignored "-o" "-i")))
    (unless files
      (setq remaining-files (git-get-filenames (ewoc-collect git-status #'git-fileinfo->needs-update))))
    (when remaining-files
      (setq remaining-files (git-run-ls-files-cached git-status remaining-files 'uptodate)))
    (git-set-filenames-state git-status remaining-files nil)
    (when mark-files (git-mark-files git-status files))
    (git-refresh-files)
    (git-refresh-ewoc-hf git-status)))

(defun git-mark-files (status files)
  "Mark all the specified FILES, and unmark the others."
  (let ((file (and files (pop files)))
        (node (ewoc-nth status 0)))
    (while node
      (let ((info (ewoc-data node)))
        (if (and file (string-equal (git-fileinfo->name info) file))
            (progn
              (unless (git-fileinfo->marked info)
                (setf (git-fileinfo->marked info) t)
                (setf (git-fileinfo->needs-refresh info) t))
              (setq file (pop files))
              (setq node (ewoc-next status node)))
          (when (git-fileinfo->marked info)
            (setf (git-fileinfo->marked info) nil)
            (setf (git-fileinfo->needs-refresh info) t))
          (if (and file (string-lessp file (git-fileinfo->name info)))
              (setq file (pop files))
            (setq node (ewoc-next status node))))))))

(defun git-marked-files ()
  "Return a list of all marked files, or if none a list containing just the file at cursor position."
  (unless git-status (error "Not in git-status buffer."))
  (or (ewoc-collect git-status (lambda (info) (git-fileinfo->marked info)))
      (list (ewoc-data (ewoc-locate git-status)))))

(defun git-marked-files-state (&rest states)
  "Return a sorted list of marked files that are in the specified states."
  (let ((files (git-marked-files))
        result)
    (dolist (info files)
      (when (memq (git-fileinfo->state info) states)
        (push info result)))
    (nreverse result)))

(defun git-refresh-files ()
  "Refresh all files that need it and clear the needs-refresh flag."
  (unless git-status (error "Not in git-status buffer."))
  (ewoc-map
   (lambda (info)
     (let ((refresh (git-fileinfo->needs-refresh info)))
       (setf (git-fileinfo->needs-refresh info) nil)
       refresh))
   git-status)
  ; move back to goal column
  (when goal-column (move-to-column goal-column)))

(defun git-refresh-ewoc-hf (status)
  "Refresh the ewoc header and footer."
  (let ((branch (git-symbolic-ref "HEAD"))
        (head (if (git-empty-db-p) "Nothing committed yet"
                (git-get-commit-description "HEAD")))
        (merge-heads (git-get-merge-heads)))
    (ewoc-set-hf status
                 (format "Directory:  %s\nBranch:     %s\nHead:       %s%s\n"
                         default-directory
                         (if branch
                             (if (string-match "^refs/heads/" branch)
                                 (substring branch (match-end 0))
                               branch)
                           "none (detached HEAD)")
                         head
                         (if merge-heads
                             (concat "\nMerging:    "
                                     (mapconcat (lambda (str) (git-get-commit-description str)) merge-heads "\n            "))
                           ""))
                 (if (ewoc-nth status 0) "" "    No changes."))))

(defun git-get-filenames (files)
  (mapcar (lambda (info) (git-fileinfo->name info)) files))

(defun git-update-index (index-file files)
  "Run git-update-index on a list of files."
  (let ((process-environment (append (and index-file (list (concat "GIT_INDEX_FILE=" index-file)))
                                     process-environment))
        added deleted modified)
    (dolist (info files)
      (case (git-fileinfo->state info)
        ('added (push info added))
        ('deleted (push info deleted))
        ('modified (push info modified))))
    (and
     (or (not added) (apply #'git-call-process-display-error "update-index" "--add" "--" (git-get-filenames added)))
     (or (not deleted) (apply #'git-call-process-display-error "update-index" "--remove" "--" (git-get-filenames deleted)))
     (or (not modified) (apply #'git-call-process-display-error "update-index" "--" (git-get-filenames modified))))))

(defun git-run-pre-commit-hook ()
  "Run the pre-commit hook if any."
  (unless git-status (error "Not in git-status buffer."))
  (let ((files (git-marked-files-state 'added 'deleted 'modified)))
    (or (not files)
        (not (file-executable-p ".git/hooks/pre-commit"))
        (let ((index-file (make-temp-file "gitidx")))
          (unwind-protect
            (let ((head-tree (unless (git-empty-db-p) (git-rev-parse "HEAD^{tree}"))))
              (git-read-tree head-tree index-file)
              (git-update-index index-file files)
              (git-run-hook "pre-commit" `(("GIT_INDEX_FILE" . ,index-file))))
          (delete-file index-file))))))

(defun git-do-commit ()
  "Perform the actual commit using the current buffer as log message."
  (interactive)
  (let ((buffer (current-buffer))
        (index-file (make-temp-file "gitidx")))
    (with-current-buffer log-edit-parent-buffer
      (if (git-marked-files-state 'unmerged)
          (message "You cannot commit unmerged files, resolve them first.")
        (unwind-protect
            (let ((files (git-marked-files-state 'added 'deleted 'modified))
                  head tree head-tree)
              (unless (git-empty-db-p)
                (setq head (git-rev-parse "HEAD")
                      head-tree (git-rev-parse "HEAD^{tree}")))
              (message "Running git commit...")
              (when
                  (and
                   (git-read-tree head-tree index-file)
                   (git-update-index nil files)         ;update both the default index
                   (git-update-index index-file files)  ;and the temporary one
                   (setq tree (git-write-tree index-file)))
                (if (or (not (string-equal tree head-tree))
                        (yes-or-no-p "The tree was not modified, do you really want to perform an empty commit? "))
                    (let ((commit (git-commit-tree buffer tree head)))
                      (when commit
                        (condition-case nil (delete-file ".git/MERGE_HEAD") (error nil))
                        (condition-case nil (delete-file ".git/MERGE_MSG") (error nil))
                        (with-current-buffer buffer (erase-buffer))
                        (git-update-status-files (git-get-filenames files))
                        (git-call-process nil "rerere")
                        (git-call-process nil "gc" "--auto")
                        (message "Committed %s." commit)
                        (git-run-hook "post-commit" nil)))
                  (message "Commit aborted."))))
          (delete-file index-file))))))


;;;; Interactive functions
;;;; ------------------------------------------------------------

(defun git-mark-file ()
  "Mark the file that the cursor is on and move to the next one."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (let* ((pos (ewoc-locate git-status))
         (info (ewoc-data pos)))
    (setf (git-fileinfo->marked info) t)
    (ewoc-invalidate git-status pos)
    (ewoc-goto-next git-status 1)))

(defun git-unmark-file ()
  "Unmark the file that the cursor is on and move to the next one."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (let* ((pos (ewoc-locate git-status))
         (info (ewoc-data pos)))
    (setf (git-fileinfo->marked info) nil)
    (ewoc-invalidate git-status pos)
    (ewoc-goto-next git-status 1)))

(defun git-unmark-file-up ()
  "Unmark the file that the cursor is on and move to the previous one."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (let* ((pos (ewoc-locate git-status))
         (info (ewoc-data pos)))
    (setf (git-fileinfo->marked info) nil)
    (ewoc-invalidate git-status pos)
    (ewoc-goto-prev git-status 1)))

(defun git-mark-all ()
  "Mark all files."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (ewoc-map (lambda (info) (unless (git-fileinfo->marked info)
                             (setf (git-fileinfo->marked info) t))) git-status)
  ; move back to goal column after invalidate
  (when goal-column (move-to-column goal-column)))

(defun git-unmark-all ()
  "Unmark all files."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (ewoc-map (lambda (info) (when (git-fileinfo->marked info)
                             (setf (git-fileinfo->marked info) nil)
                             t)) git-status)
  ; move back to goal column after invalidate
  (when goal-column (move-to-column goal-column)))

(defun git-toggle-all-marks ()
  "Toggle all file marks."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (ewoc-map (lambda (info) (setf (git-fileinfo->marked info) (not (git-fileinfo->marked info))) t) git-status)
  ; move back to goal column after invalidate
  (when goal-column (move-to-column goal-column)))

(defun git-next-file (&optional n)
  "Move the selection down N files."
  (interactive "p")
  (unless git-status (error "Not in git-status buffer."))
  (ewoc-goto-next git-status n))

(defun git-prev-file (&optional n)
  "Move the selection up N files."
  (interactive "p")
  (unless git-status (error "Not in git-status buffer."))
  (ewoc-goto-prev git-status n))

(defun git-next-unmerged-file (&optional n)
  "Move the selection down N unmerged files."
  (interactive "p")
  (unless git-status (error "Not in git-status buffer."))
  (let* ((last (ewoc-locate git-status))
         (node (ewoc-next git-status last)))
    (while (and node (> n 0))
      (when (eq 'unmerged (git-fileinfo->state (ewoc-data node)))
        (setq n (1- n))
        (setq last node))
      (setq node (ewoc-next git-status node)))
    (ewoc-goto-node git-status last)))

(defun git-prev-unmerged-file (&optional n)
  "Move the selection up N unmerged files."
  (interactive "p")
  (unless git-status (error "Not in git-status buffer."))
  (let* ((last (ewoc-locate git-status))
         (node (ewoc-prev git-status last)))
    (while (and node (> n 0))
      (when (eq 'unmerged (git-fileinfo->state (ewoc-data node)))
        (setq n (1- n))
        (setq last node))
      (setq node (ewoc-prev git-status node)))
    (ewoc-goto-node git-status last)))

(defun git-insert-file (file)
  "Insert file(s) into the git-status buffer."
  (interactive "fInsert file: ")
  (git-update-status-files (list (file-relative-name file))))

(defun git-add-file ()
  "Add marked file(s) to the index cache."
  (interactive)
  (let ((files (git-get-filenames (git-marked-files-state 'unknown 'ignored))))
    ;; FIXME: add support for directories
    (unless files
      (push (file-relative-name (read-file-name "File to add: " nil nil t)) files))
    (when (apply 'git-call-process-display-error "update-index" "--add" "--" files)
      (git-update-status-files files)
      (git-success-message "Added" files))))

(defun git-ignore-file ()
  "Add marked file(s) to the ignore list."
  (interactive)
  (let ((files (git-get-filenames (git-marked-files-state 'unknown))))
    (unless files
      (push (file-relative-name (read-file-name "File to ignore: " nil nil t)) files))
    (dolist (f files) (git-append-to-ignore f))
    (git-update-status-files files)
    (git-success-message "Ignored" files)))

(defun git-remove-file ()
  "Remove the marked file(s)."
  (interactive)
  (let ((files (git-get-filenames (git-marked-files-state 'added 'modified 'unknown 'uptodate 'ignored))))
    (unless files
      (push (file-relative-name (read-file-name "File to remove: " nil nil t)) files))
    (if (yes-or-no-p
         (if (cdr files)
             (format "Remove %d files? " (length files))
           (format "Remove %s? " (car files))))
        (progn
          (dolist (name files)
            (ignore-errors
              (if (file-directory-p name)
                  (delete-directory name)
                (delete-file name))))
          (when (apply 'git-call-process-display-error "update-index" "--remove" "--" files)
            (git-update-status-files files)
            (git-success-message "Removed" files)))
      (message "Aborting"))))

(defun git-revert-file ()
  "Revert changes to the marked file(s)."
  (interactive)
  (let ((files (git-marked-files-state 'added 'deleted 'modified 'unmerged))
        added modified)
    (when (and files
               (yes-or-no-p
                (if (cdr files)
                    (format "Revert %d files? " (length files))
                  (format "Revert %s? " (git-fileinfo->name (car files))))))
      (dolist (info files)
        (case (git-fileinfo->state info)
          ('added (push (git-fileinfo->name info) added))
          ('deleted (push (git-fileinfo->name info) modified))
          ('unmerged (push (git-fileinfo->name info) modified))
          ('modified (push (git-fileinfo->name info) modified))))
      ;; check if a buffer contains one of the files and isn't saved
      (dolist (file modified)
        (let ((buffer (get-file-buffer file)))
          (when (and buffer (buffer-modified-p buffer))
            (error "Buffer %s is modified. Please kill or save modified buffers before reverting." (buffer-name buffer)))))
      (let ((ok (and
                 (or (not added)
                     (apply 'git-call-process-display-error "update-index" "--force-remove" "--" added))
                 (or (not modified)
                     (apply 'git-call-process-display-error "checkout" "HEAD" modified))))
            (names (git-get-filenames files)))
        (git-update-status-files names)
        (when ok
          (dolist (file modified)
            (let ((buffer (get-file-buffer file)))
              (when buffer (with-current-buffer buffer (revert-buffer t t t)))))
          (git-success-message "Reverted" names))))))

(defun git-resolve-file ()
  "Resolve conflicts in marked file(s)."
  (interactive)
  (let ((files (git-get-filenames (git-marked-files-state 'unmerged))))
    (when files
      (when (apply 'git-call-process-display-error "update-index" "--" files)
        (git-update-status-files files)
        (git-success-message "Resolved" files)))))

(defun git-remove-handled ()
  "Remove handled files from the status list."
  (interactive)
  (ewoc-filter git-status
               (lambda (info)
                 (case (git-fileinfo->state info)
                   ('ignored git-show-ignored)
                   ('uptodate git-show-uptodate)
                   ('unknown git-show-unknown)
                   (t t))))
  (unless (ewoc-nth git-status 0)  ; refresh header if list is empty
    (git-refresh-ewoc-hf git-status)))

(defun git-toggle-show-uptodate ()
  "Toogle the option for showing up-to-date files."
  (interactive)
  (if (setq git-show-uptodate (not git-show-uptodate))
      (git-refresh-status)
    (git-remove-handled)))

(defun git-toggle-show-ignored ()
  "Toogle the option for showing ignored files."
  (interactive)
  (if (setq git-show-ignored (not git-show-ignored))
      (progn
        (message "Inserting ignored files...")
        (git-run-ls-files-with-excludes git-status nil 'ignored "-o" "-i")
        (git-refresh-files)
        (git-refresh-ewoc-hf git-status)
        (message "Inserting ignored files...done"))
    (git-remove-handled)))

(defun git-toggle-show-unknown ()
  "Toogle the option for showing unknown files."
  (interactive)
  (if (setq git-show-unknown (not git-show-unknown))
      (progn
        (message "Inserting unknown files...")
        (git-run-ls-files-with-excludes git-status nil 'unknown "-o")
        (git-refresh-files)
        (git-refresh-ewoc-hf git-status)
        (message "Inserting unknown files...done"))
    (git-remove-handled)))

(defun git-expand-directory (info)
  "Expand the directory represented by INFO to list its files."
  (when (eq (lsh (git-fileinfo->new-perm info) -9) ?\110)
    (let ((dir (git-fileinfo->name info)))
      (git-set-filenames-state git-status (list dir) nil)
      (git-run-ls-files-with-excludes git-status (list (concat dir "/")) 'unknown "-o")
      (git-refresh-files)
      (git-refresh-ewoc-hf git-status)
      t)))

(defun git-setup-diff-buffer (buffer)
  "Setup a buffer for displaying a diff."
  (let ((dir default-directory))
    (with-current-buffer buffer
      (diff-mode)
      (goto-char (point-min))
      (setq default-directory dir)
      (setq buffer-read-only t)))
  (display-buffer buffer)
  ; shrink window only if it displays the status buffer
  (when (eq (window-buffer) (current-buffer))
    (shrink-window-if-larger-than-buffer)))

(defun git-diff-file ()
  "Diff the marked file(s) against HEAD."
  (interactive)
  (let ((files (git-marked-files)))
    (git-setup-diff-buffer
     (apply #'git-run-command-buffer "*git-diff*" "diff-index" "-p" "-M" "HEAD" "--" (git-get-filenames files)))))

(defun git-diff-file-merge-head (arg)
  "Diff the marked file(s) against the first merge head (or the nth one with a numeric prefix)."
  (interactive "p")
  (let ((files (git-marked-files))
        (merge-heads (git-get-merge-heads)))
    (unless merge-heads (error "No merge in progress"))
    (git-setup-diff-buffer
     (apply #'git-run-command-buffer "*git-diff*" "diff-index" "-p" "-M"
            (or (nth (1- arg) merge-heads) "HEAD") "--" (git-get-filenames files)))))

(defun git-diff-unmerged-file (stage)
  "Diff the marked unmerged file(s) against the specified stage."
  (let ((files (git-marked-files)))
    (git-setup-diff-buffer
     (apply #'git-run-command-buffer "*git-diff*" "diff-files" "-p" stage "--" (git-get-filenames files)))))

(defun git-diff-file-base ()
  "Diff the marked unmerged file(s) against the common base file."
  (interactive)
  (git-diff-unmerged-file "-1"))

(defun git-diff-file-mine ()
  "Diff the marked unmerged file(s) against my pre-merge version."
  (interactive)
  (git-diff-unmerged-file "-2"))

(defun git-diff-file-other ()
  "Diff the marked unmerged file(s) against the other's pre-merge version."
  (interactive)
  (git-diff-unmerged-file "-3"))

(defun git-diff-file-combined ()
  "Do a combined diff of the marked unmerged file(s)."
  (interactive)
  (git-diff-unmerged-file "-c"))

(defun git-diff-file-idiff ()
  "Perform an interactive diff on the current file."
  (interactive)
  (let ((files (git-marked-files-state 'added 'deleted 'modified)))
    (unless (eq 1 (length files))
      (error "Cannot perform an interactive diff on multiple files."))
    (let* ((filename (car (git-get-filenames files)))
           (buff1 (find-file-noselect filename))
           (buff2 (git-run-command-buffer (concat filename ".~HEAD~") "cat-file" "blob" (concat "HEAD:" filename))))
      (ediff-buffers buff1 buff2))))

(defun git-log-file ()
  "Display a log of changes to the marked file(s)."
  (interactive)
  (let* ((files (git-marked-files))
         (coding-system-for-read git-commits-coding-system)
         (buffer (apply #'git-run-command-buffer "*git-log*" "rev-list" "--pretty" "HEAD" "--" (git-get-filenames files))))
    (with-current-buffer buffer
      ; (git-log-mode)  FIXME: implement log mode
      (goto-char (point-min))
      (setq buffer-read-only t))
    (display-buffer buffer)))

(defun git-log-edit-files ()
  "Return a list of marked files for use in the log-edit buffer."
  (with-current-buffer log-edit-parent-buffer
    (git-get-filenames (git-marked-files-state 'added 'deleted 'modified))))

(defun git-log-edit-diff ()
  "Run a diff of the current files being committed from a log-edit buffer."
  (with-current-buffer log-edit-parent-buffer
    (git-diff-file)))

(defun git-append-sign-off (name email)
  "Append a Signed-off-by entry to the current buffer, avoiding duplicates."
  (let ((sign-off (format "Signed-off-by: %s <%s>" name email))
        (case-fold-search t))
    (goto-char (point-min))
    (unless (re-search-forward (concat "^" (regexp-quote sign-off)) nil t)
      (goto-char (point-min))
      (unless (re-search-forward "^Signed-off-by: " nil t)
        (setq sign-off (concat "\n" sign-off)))
      (goto-char (point-max))
      (insert sign-off "\n"))))

(defun git-setup-log-buffer (buffer &optional merge-heads author-name author-email subject date msg)
  "Setup the log buffer for a commit."
  (unless git-status (error "Not in git-status buffer."))
  (let ((dir default-directory)
        (committer-name (git-get-committer-name))
        (committer-email (git-get-committer-email))
        (sign-off git-append-signed-off-by))
    (with-current-buffer buffer
      (cd dir)
      (erase-buffer)
      (insert
       (propertize
        (format "Author: %s <%s>\n%s%s"
                (or author-name committer-name)
                (or author-email committer-email)
                (if date (format "Date: %s\n" date) "")
                (if merge-heads
                    (format "Merge: %s\n"
                            (mapconcat 'identity merge-heads " "))
                  ""))
        'face 'git-header-face)
       (propertize git-log-msg-separator 'face 'git-separator-face)
       "\n")
      (when subject (insert subject "\n\n"))
      (cond (msg (insert msg "\n"))
            ((file-readable-p ".git/rebase-apply/msg")
             (insert-file-contents ".git/rebase-apply/msg"))
            ((file-readable-p ".git/MERGE_MSG")
             (insert-file-contents ".git/MERGE_MSG")))
      ; delete empty lines at end
      (goto-char (point-min))
      (when (re-search-forward "\n+\\'" nil t)
        (replace-match "\n" t t))
      (when sign-off (git-append-sign-off committer-name committer-email)))
    buffer))

(defun git-commit-file ()
  "Commit the marked file(s), asking for a commit message."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (when (git-run-pre-commit-hook)
    (let ((buffer (get-buffer-create "*git-commit*"))
          (coding-system (git-get-commits-coding-system))
          author-name author-email subject date)
      (when (eq 0 (buffer-size buffer))
        (when (file-readable-p ".git/rebase-apply/info")
          (with-temp-buffer
            (insert-file-contents ".git/rebase-apply/info")
            (goto-char (point-min))
            (when (re-search-forward "^Author: \\(.*\\)\nEmail: \\(.*\\)$" nil t)
              (setq author-name (match-string 1))
              (setq author-email (match-string 2)))
            (goto-char (point-min))
            (when (re-search-forward "^Subject: \\(.*\\)$" nil t)
              (setq subject (match-string 1)))
            (goto-char (point-min))
            (when (re-search-forward "^Date: \\(.*\\)$" nil t)
              (setq date (match-string 1)))))
        (git-setup-log-buffer buffer (git-get-merge-heads) author-name author-email subject date))
      (if (boundp 'log-edit-diff-function)
	  (log-edit 'git-do-commit nil '((log-edit-listfun . git-log-edit-files)
					 (log-edit-diff-function . git-log-edit-diff)) buffer)
	(log-edit 'git-do-commit nil 'git-log-edit-files buffer))
      (setq font-lock-keywords (font-lock-compile-keywords git-log-edit-font-lock-keywords))
      (setq paragraph-separate (concat (regexp-quote git-log-msg-separator) "$\\|Author: \\|Date: \\|Merge: \\|Signed-off-by: \\|\f\\|[ 	]*$"))
      (setq buffer-file-coding-system coding-system)
      (re-search-forward (regexp-quote (concat git-log-msg-separator "\n")) nil t))))

(defun git-setup-commit-buffer (commit)
  "Setup the commit buffer with the contents of COMMIT."
  (let (parents author-name author-email subject date msg)
    (with-temp-buffer
      (let ((coding-system (git-get-logoutput-coding-system)))
        (git-call-process t "log" "-1" "--pretty=medium" "--abbrev=40" commit)
        (goto-char (point-min))
        (when (re-search-forward "^Merge: *\\(.*\\)$" nil t)
          (setq parents (cdr (split-string (match-string 1) " +"))))
        (when (re-search-forward "^Author: *\\(.*\\) <\\(.*\\)>$" nil t)
          (setq author-name (match-string 1))
          (setq author-email (match-string 2)))
        (when (re-search-forward "^Date: *\\(.*\\)$" nil t)
          (setq date (match-string 1)))
        (while (re-search-forward "^    \\(.*\\)$" nil t)
          (push (match-string 1) msg))
        (setq msg (nreverse msg))
        (setq subject (pop msg))
        (while (and msg (zerop (length (car msg))) (pop msg)))))
    (git-setup-log-buffer (get-buffer-create "*git-commit*")
                          parents author-name author-email subject date
                          (mapconcat #'identity msg "\n"))))

(defun git-get-commit-files (commit)
  "Retrieve a sorted list of files modified by COMMIT."
  (let (files)
    (with-temp-buffer
      (git-call-process t "diff-tree" "-m" "-r" "-z" "--name-only" "--no-commit-id" "--root" commit)
      (goto-char (point-min))
      (while (re-search-forward "\\([^\0]*\\)\0" nil t 1)
        (push (match-string 1) files)))
    (sort files #'string-lessp)))

(defun git-read-commit-name (prompt &optional default)
  "Ask for a commit name, with completion for local branch, remote branch and tag."
  (completing-read prompt
                   (list* "HEAD" "ORIG_HEAD" "FETCH_HEAD" (mapcar #'car (git-for-each-ref)))
		   nil nil nil nil default))

(defun git-checkout (branch &optional merge)
  "Checkout a branch, tag, or any commit.
Use a prefix arg if git should merge while checking out."
  (interactive
   (list (git-read-commit-name "Checkout: ")
         current-prefix-arg))
  (unless git-status (error "Not in git-status buffer."))
  (let ((args (list branch "--")))
    (when merge (push "-m" args))
    (when (apply #'git-call-process-display-error "checkout" args)
      (git-update-status-files))))

(defun git-branch (branch)
  "Create a branch from the current HEAD and switch to it."
  (interactive (list (git-read-commit-name "Branch: ")))
  (unless git-status (error "Not in git-status buffer."))
  (if (git-rev-parse (concat "refs/heads/" branch))
      (if (yes-or-no-p (format "Branch %s already exists, replace it? " branch))
          (and (git-call-process-display-error "branch" "-f" branch)
               (git-call-process-display-error "checkout" branch))
        (message "Canceled."))
    (git-call-process-display-error "checkout" "-b" branch))
    (git-refresh-ewoc-hf git-status))

(defun git-amend-commit ()
  "Undo the last commit on HEAD, and set things up to commit an
amended version of it."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (when (git-empty-db-p) (error "No commit to amend."))
  (let* ((commit (git-rev-parse "HEAD"))
         (files (git-get-commit-files commit)))
    (when (if (git-rev-parse "HEAD^")
              (git-call-process-display-error "reset" "--soft" "HEAD^")
            (and (git-update-ref "ORIG_HEAD" commit)
                 (git-update-ref "HEAD" nil commit)))
      (git-update-status-files files t)
      (git-setup-commit-buffer commit)
      (git-commit-file))))

(defun git-cherry-pick-commit (arg)
  "Cherry-pick a commit."
  (interactive (list (git-read-commit-name "Cherry-pick commit: ")))
  (unless git-status (error "Not in git-status buffer."))
  (let ((commit (git-rev-parse (concat arg "^0"))))
    (unless commit (error "Not a valid commit '%s'." arg))
    (when (git-rev-parse (concat commit "^2"))
      (error "Cannot cherry-pick a merge commit."))
    (let ((files (git-get-commit-files commit))
          (ok (git-call-process-display-error "cherry-pick" "-n" commit)))
      (git-update-status-files files ok)
      (with-current-buffer (git-setup-commit-buffer commit)
        (goto-char (point-min))
        (if (re-search-forward "^\n*Signed-off-by:" nil t 1)
            (goto-char (match-beginning 0))
          (goto-char (point-max)))
        (insert "(cherry picked from commit " commit ")\n"))
      (when ok (git-commit-file)))))

(defun git-revert-commit (arg)
  "Revert a commit."
  (interactive (list (git-read-commit-name "Revert commit: ")))
  (unless git-status (error "Not in git-status buffer."))
  (let ((commit (git-rev-parse (concat arg "^0"))))
    (unless commit (error "Not a valid commit '%s'." arg))
    (when (git-rev-parse (concat commit "^2"))
      (error "Cannot revert a merge commit."))
    (let ((files (git-get-commit-files commit))
          (subject (git-get-commit-description commit))
          (ok (git-call-process-display-error "revert" "-n" commit)))
      (git-update-status-files files ok)
      (when (string-match "^[0-9a-f]+ - \\(.*\\)$" subject)
        (setq subject (match-string 1 subject)))
      (git-setup-log-buffer (get-buffer-create "*git-commit*")
                            (git-get-merge-heads) nil nil (format "Revert \"%s\"" subject) nil
                            (format "This reverts commit %s.\n" commit))
      (when ok (git-commit-file)))))

(defun git-find-file ()
  "Visit the current file in its own buffer."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (let ((info (ewoc-data (ewoc-locate git-status))))
    (unless (git-expand-directory info)
      (find-file (git-fileinfo->name info))
      (when (eq 'unmerged (git-fileinfo->state info))
        (smerge-mode 1)))))

(defun git-find-file-other-window ()
  "Visit the current file in its own buffer in another window."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (let ((info (ewoc-data (ewoc-locate git-status))))
    (find-file-other-window (git-fileinfo->name info))
    (when (eq 'unmerged (git-fileinfo->state info))
      (smerge-mode))))

(defun git-find-file-imerge ()
  "Visit the current file in interactive merge mode."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (let ((info (ewoc-data (ewoc-locate git-status))))
    (find-file (git-fileinfo->name info))
    (smerge-ediff)))

(defun git-view-file ()
  "View the current file in its own buffer."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (let ((info (ewoc-data (ewoc-locate git-status))))
    (view-file (git-fileinfo->name info))))

(defun git-refresh-status ()
  "Refresh the git status buffer."
  (interactive)
  (unless git-status (error "Not in git-status buffer."))
  (message "Refreshing git status...")
  (git-update-status-files)
  (message "Refreshing git status...done"))

(defun git-status-quit ()
  "Quit git-status mode."
  (interactive)
  (bury-buffer))

;;;; Major Mode
;;;; ------------------------------------------------------------

(defvar git-status-mode-hook nil
  "Run after `git-status-mode' is setup.")

(defvar git-status-mode-map nil
  "Keymap for git major mode.")

(defvar git-status nil
  "List of all files managed by the git-status mode.")

(unless git-status-mode-map
  (let ((map (make-keymap))
        (commit-map (make-sparse-keymap))
        (diff-map (make-sparse-keymap))
        (toggle-map (make-sparse-keymap)))
    (suppress-keymap map)
    (define-key map "?"   'git-help)
    (define-key map "h"   'git-help)
    (define-key map " "   'git-next-file)
    (define-key map "a"   'git-add-file)
    (define-key map "c"   'git-commit-file)
    (define-key map "\C-c" commit-map)
    (define-key map "d"    diff-map)
    (define-key map "="   'git-diff-file)
    (define-key map "f"   'git-find-file)
    (define-key map "\r"  'git-find-file)
    (define-key map "g"   'git-refresh-status)
    (define-key map "i"   'git-ignore-file)
    (define-key map "I"   'git-insert-file)
    (define-key map "l"   'git-log-file)
    (define-key map "m"   'git-mark-file)
    (define-key map "M"   'git-mark-all)
    (define-key map "n"   'git-next-file)
    (define-key map "N"   'git-next-unmerged-file)
    (define-key map "o"   'git-find-file-other-window)
    (define-key map "p"   'git-prev-file)
    (define-key map "P"   'git-prev-unmerged-file)
    (define-key map "q"   'git-status-quit)
    (define-key map "r"   'git-remove-file)
    (define-key map "R"   'git-resolve-file)
    (define-key map "t"    toggle-map)
    (define-key map "T"   'git-toggle-all-marks)
    (define-key map "u"   'git-unmark-file)
    (define-key map "U"   'git-revert-file)
    (define-key map "v"   'git-view-file)
    (define-key map "x"   'git-remove-handled)
    (define-key map "\C-?" 'git-unmark-file-up)
    (define-key map "\M-\C-?" 'git-unmark-all)
    ; the commit submap
    (define-key commit-map "\C-a" 'git-amend-commit)
    (define-key commit-map "\C-b" 'git-branch)
    (define-key commit-map "\C-o" 'git-checkout)
    (define-key commit-map "\C-p" 'git-cherry-pick-commit)
    (define-key commit-map "\C-v" 'git-revert-commit)
    ; the diff submap
    (define-key diff-map "b" 'git-diff-file-base)
    (define-key diff-map "c" 'git-diff-file-combined)
    (define-key diff-map "=" 'git-diff-file)
    (define-key diff-map "e" 'git-diff-file-idiff)
    (define-key diff-map "E" 'git-find-file-imerge)
    (define-key diff-map "h" 'git-diff-file-merge-head)
    (define-key diff-map "m" 'git-diff-file-mine)
    (define-key diff-map "o" 'git-diff-file-other)
    ; the toggle submap
    (define-key toggle-map "u" 'git-toggle-show-uptodate)
    (define-key toggle-map "i" 'git-toggle-show-ignored)
    (define-key toggle-map "k" 'git-toggle-show-unknown)
    (define-key toggle-map "m" 'git-toggle-all-marks)
    (setq git-status-mode-map map))
  (easy-menu-define git-menu git-status-mode-map
    "Git Menu"
    `("Git"
      ["Refresh" git-refresh-status t]
      ["Commit" git-commit-file t]
      ["Checkout..." git-checkout t]
      ["New Branch..." git-branch t]
      ["Cherry-pick Commit..." git-cherry-pick-commit t]
      ["Revert Commit..." git-revert-commit t]
      ("Merge"
	["Next Unmerged File" git-next-unmerged-file t]
	["Prev Unmerged File" git-prev-unmerged-file t]
	["Mark as Resolved" git-resolve-file t]
	["Interactive Merge File" git-find-file-imerge t]
	["Diff Against Common Base File" git-diff-file-base t]
	["Diff Combined" git-diff-file-combined t]
	["Diff Against Merge Head" git-diff-file-merge-head t]
	["Diff Against Mine" git-diff-file-mine t]
	["Diff Against Other" git-diff-file-other t])
      "--------"
      ["Add File" git-add-file t]
      ["Revert File" git-revert-file t]
      ["Ignore File" git-ignore-file t]
      ["Remove File" git-remove-file t]
      ["Insert File" git-insert-file t]
      "--------"
      ["Find File" git-find-file t]
      ["View File" git-view-file t]
      ["Diff File" git-diff-file t]
      ["Interactive Diff File" git-diff-file-idiff t]
      ["Log" git-log-file t]
      "--------"
      ["Mark" git-mark-file t]
      ["Mark All" git-mark-all t]
      ["Unmark" git-unmark-file t]
      ["Unmark All" git-unmark-all t]
      ["Toggle All Marks" git-toggle-all-marks t]
      ["Hide Handled Files" git-remove-handled t]
      "--------"
      ["Show Uptodate Files" git-toggle-show-uptodate :style toggle :selected git-show-uptodate]
      ["Show Ignored Files" git-toggle-show-ignored :style toggle :selected git-show-ignored]
      ["Show Unknown Files" git-toggle-show-unknown :style toggle :selected git-show-unknown]
      "--------"
      ["Quit" git-status-quit t])))


;; git mode should only run in the *git status* buffer
(put 'git-status-mode 'mode-class 'special)

(defun git-status-mode ()
  "Major mode for interacting with Git.
Commands:
\\{git-status-mode-map}"
  (kill-all-local-variables)
  (buffer-disable-undo)
  (setq mode-name "git status"
        major-mode 'git-status-mode
        goal-column 17
        buffer-read-only t)
  (use-local-map git-status-mode-map)
  (let ((buffer-read-only nil))
    (erase-buffer)
  (let ((status (ewoc-create 'git-fileinfo-prettyprint "" "")))
    (set (make-local-variable 'git-status) status))
  (set (make-local-variable 'list-buffers-directory) default-directory)
  (make-local-variable 'git-show-uptodate)
  (make-local-variable 'git-show-ignored)
  (make-local-variable 'git-show-unknown)
  (run-hooks 'git-status-mode-hook)))

(defun git-find-status-buffer (dir)
  "Find the git status buffer handling a specified directory."
  (let ((list (buffer-list))
        (fulldir (expand-file-name dir))
        found)
    (while (and list (not found))
      (let ((buffer (car list)))
        (with-current-buffer buffer
          (when (and list-buffers-directory
                     (string-equal fulldir (expand-file-name list-buffers-directory))
		     (eq major-mode 'git-status-mode))
            (setq found buffer))))
      (setq list (cdr list)))
    found))

(defun git-status (dir)
  "Entry point into git-status mode."
  (interactive "DSelect directory: ")
  (setq dir (git-get-top-dir dir))
  (if (file-directory-p (concat (file-name-as-directory dir) ".git"))
      (let ((buffer (or (and git-reuse-status-buffer (git-find-status-buffer dir))
                        (create-file-buffer (expand-file-name "*git-status*" dir)))))
        (switch-to-buffer buffer)
        (cd dir)
        (git-status-mode)
        (git-refresh-status)
        (goto-char (point-min))
        (add-hook 'after-save-hook 'git-update-saved-file))
    (message "%s is not a git working tree." dir)))

(defun git-update-saved-file ()
  "Update the corresponding git-status buffer when a file is saved.
Meant to be used in `after-save-hook'."
  (let* ((file (expand-file-name buffer-file-name))
         (dir (condition-case nil (git-get-top-dir (file-name-directory file)) (error nil)))
         (buffer (and dir (git-find-status-buffer dir))))
    (when buffer
      (with-current-buffer buffer
        (let ((filename (file-relative-name file dir)))
          ; skip files located inside the .git directory
          (unless (string-match "^\\.git/" filename)
            (git-call-process nil "add" "--refresh" "--" filename)
            (git-update-status-files (list filename))))))))

(defun git-help ()
  "Display help for Git mode."
  (interactive)
  (describe-function 'git-status-mode))

(provide 'git)
;;; git.el ends here