summaryrefslogtreecommitdiff
path: root/contrib/emacs/git.el
blob: 5f22dec5f71bfe2cb983dd9eabbb1b848b252eba (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
;;; git.el --- A user interface for git
 
;; Copyright (C) 2005, 2006, 2007 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
;;  - portability to XEmacs
;;  - better handling of subprocess errors
;;  - hook into file save (after-save-hook)
;;  - diff against other branch
;;  - renaming files from the status buffer
;;  - creating tags
;;  - fetch/pull
;;  - switching branches
;;  - revlist browser
;;  - git-show-branch browser
;;  - menus
;;
 
(eval-when-compile (require 'cl))
(require 'ewoc)
(require 'log-edit)
 
 
;;;; 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)
 
 
(defface git-status-face
  '((((class color) (background light)) (:foreground "purple")))
  "Git mode face used to highlight added and modified files."
  :group 'git)
 
(defface git-unmerged-face
  '((((class color) (background light)) (: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)))
  "Git mode face used to highlight unknown files."
  :group 'git)
 
(defface git-uptodate-face
  '((((class color) (background light)) (:foreground "grey60")))
  "Git mode face used to highlight up-to-date files."
  :group 'git)
 
(defface git-ignored-face
  '((((class color) (background light)) (:foreground "grey60")))
  "Git mode face used to highlight ignored files."
  :group 'git)
 
(defface git-mark-face
  '((((class color) (background light)) (:foreground "red" :bold t)))
  "Git mode face used for the file marks."
  :group 'git)
 
(defface git-header-face
  '((((class color) (background light)) (:foreground "blue")))
  "Git mode face used for commit headers."
  :group 'git)
 
(defface git-separator-face
  '((((class color) (background light)) (:foreground "brown")))
  "Git mode face used for commit separator."
  :group 'git)
 
(defface git-permission-face
  '((((class color) (background light)) (: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:\\|Parent:\\|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-env (buffer env &rest args)
  "Wrapper for call-process that sets environment strings."
  (if env
      (apply #'call-process "env" nil buffer nil
             (append (git-get-env-strings env) (list "git") args))
    (apply #'call-process "git" nil buffer nil args)))
 
(defun git-call-process-env-string (env &rest args)
  "Wrapper for call-process that sets environment strings,
and returns the process output as a string."
  (with-temp-buffer
    (and (eq 0 (apply #' git-call-process-env t env args))
         (buffer-string))))
 
(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 nil) 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-env buffer nil args)))
    (message "Running git %s...done" (car args))
    buffer))
 
(defun git-run-command (buffer env &rest args)
  (message "Running git %s..." (car args))
  (apply #'git-call-process-env buffer env args)
  (message "Running git %s...done" (car args)))
 
(defun git-run-command-region (buffer start end env &rest args)
  "Run a git command with specified buffer region as input."
  (message "Running git %s..." (car args))
  (unless (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)))
    (error "Failed to run \"git %s\":\n%s" (mapconcat (lambda (x) x) args " ") (buffer-string)))
  (message "Running git %s...done" (car args)))
 
(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-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-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 (call-process "git" nil t nil "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-run-command nil nil "update-index" "--info-only" "--add" "--" (file-relative-name ignore-name)))
  (git-add-status-file (if created 'added 'modified) (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-env-string nil "rev-parse" rev)))
 
(defun git-config (key)
  "Retrieve the value associated to KEY in the git repository config file."
  (let ((str (git-call-process-env-string nil "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-env-string nil "symbolic-ref" ref)))
    (and str (car (split-string str "\n")))))
 
(defun git-update-ref (ref val &optional oldval)
  "Update a reference by calling git-update-ref."
  (apply #'git-call-process-env nil nil "update-ref" ref val (if oldval (list oldval))))
 
(defun git-read-tree (tree &optional index-file)
  "Read a tree into the index file."
  (apply #'git-call-process-env nil
         (if index-file `(("GIT_INDEX_FILE" . ,index-file)) nil)
         "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."
  (git-get-string-sha1
   (git-call-process-env-string (and index-file `(("GIT_INDEX_FILE" . ,index-file))) "write-tree")))
 
(defun git-commit-tree (buffer tree head)
  "Call git-commit-tree with buffer as input and return the resulting commit SHA1."
  (let ((author-name (git-get-committer-name))
        (author-email (git-get-committer-email))
        author-date log-start log-end args coding-system-for-write)
    (when head
      (push "-p" args)
      (push head 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))
            (while (re-search-forward "^Parent: +\\([0-9a-f]+\\)" nil t)
              (unless (string-equal head (match-string 1))
                (push "-p" args)
                (push (match-string 1) args))))
        (setq log-start (point-min)))
      (setq log-end (point-max))
      (setq coding-system-for-write buffer-file-coding-system))
    (git-get-string-sha1
     (with-output-to-string
       (with-current-buffer standard-output
         (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))))))))
 
(defun git-empty-db-p ()
  "Check if the git db is empty (no commit done yet)."
  (not (eq 0 (call-process "git" nil nil 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)))
 
;;;; 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-refresh)      ;; whether file needs to be refreshed
 
(defvar git-status nil)
 
(defun git-clear-status (status)
  "Remove everything from the status list."
  (ewoc-filter status (lambda (info) nil)))
 
(defun git-set-files-state (files state)
  "Set the state of a list of files."
  (dolist (info files)
    (unless (eq (git-fileinfo->state info) state)
      (setf (git-fileinfo->state info) state)
      (setf (git-fileinfo->rename-state info) nil)
      (setf (git-fileinfo->orig-name info) nil)
      (setf (git-fileinfo->needs-refresh info) t))))
 
(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 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-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."
  (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 (git-fileinfo->old-perm info) (git-fileinfo->new-perm info))
                  "  " (git-escape-file-name (git-fileinfo->name info))
                  (git-rename-as-string info))))
 
(defun git-parse-status (status)
  "Parse the output of git-diff-index in the current buffer."
  (goto-char (point-min))
  (while (re-search-forward
          ":\\([0-7]\\{6\\}\\) \\([0-7]\\{6\\}\\) [0-9a-f]\\{40\\} [0-9a-f]\\{40\\} \\(\\([ADMU]\\)\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))
              (ewoc-enter-last status (git-create-fileinfo 'added new-name old-perm new-perm 'copy name))
            (ewoc-enter-last status (git-create-fileinfo 'deleted name 0 0 'rename new-name))
            (ewoc-enter-last status (git-create-fileinfo 'added new-name old-perm new-perm 'rename name)))
        (ewoc-enter-last status (git-create-fileinfo (git-state-code state) name old-perm new-perm))))))
 
(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-parse-ls-files (status default-state &optional skip-existing)
  "Parse the output of git-ls-files in the current buffer."
  (goto-char (point-min))
  (let (infolist)
    (while (re-search-forward "\\([HMRCK?]\\) \\([^\0]*\\)\0" nil t 1)
      (let ((state (match-string 1))
            (name (match-string 2)))
        (unless (and skip-existing (git-find-status-file status name))
          (push (git-create-fileinfo (or (git-state-code state) default-state) name) infolist))))
    (dolist (info (nreverse infolist))
      (ewoc-enter-last status info))))
 
(defun git-parse-ls-unmerged (status)
  "Parse the output of git-ls-files -u in the current buffer."
  (goto-char (point-min))
  (let (files)
    (while (re-search-forward "[0-7]\\{6\\} [0-9a-f]\\{40\\} [123]\t\\([^\0]+\\)\0" nil t)
      (let ((node (git-find-status-file status (match-string 1))))
        (when node (push (ewoc-data node) files))))
    (git-set-files-state files 'unmerged)))
 
(defun git-add-status-file (state name)
  "Add a new file to the status list (if not existing already) and return its node."
  (unless git-status (error "Not in git-status buffer."))
  (or (git-find-status-file git-status name)
      (ewoc-enter-last git-status (git-create-fileinfo state name))))
 
(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 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)))
    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"
                (substring (git-rev-parse "HEAD") 0 10)))
        (merge-heads (git-get-merge-heads)))
    (ewoc-set-hf status
                 (format "Directory:  %s\nBranch:     %s\nHead:       %s%s\n"
                         default-directory
                         (if (string-match "^refs/heads/" branch)
                             (substring branch (match-end 0))
                           branch)
                         head
                         (if merge-heads
                             (concat "\nMerging:    "
                                     (mapconcat (lambda (str) (substring str 0 10)) merge-heads " "))
                           ""))
                 (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 ((env (and index-file `(("GIT_INDEX_FILE" . ,index-file))))
        added deleted modified)
    (dolist (info files)
      (case (git-fileinfo->state info)
        ('added (push info added))
        ('deleted (push info deleted))
        ('modified (push info modified))))
    (when added
      (apply #'git-run-command nil env "update-index" "--add" "--" (git-get-filenames added)))
    (when deleted
      (apply #'git-run-command nil env "update-index" "--remove" "--" (git-get-filenames deleted)))
    (when modified
      (apply #'git-run-command nil env "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 head-tree)
              (unless (git-empty-db-p)
                (setq head (git-rev-parse "HEAD")
                      head-tree (git-rev-parse "HEAD^{tree}")))
              (if files
                  (progn
                    (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
                    (let ((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)))
                            (git-update-ref "HEAD" commit head)
                            (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-set-files-state files 'uptodate)
                            (when (file-directory-p ".git/rr-cache")
                              (git-run-command nil nil "rerere"))
                            (git-refresh-files)
                            (git-refresh-ewoc-hf git-status)
                            (message "Committed %s." commit)
                            (git-run-hook "post-commit" nil))
                        (message "Commit aborted."))))
                (message "No files to commit.")))
          (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) (setf (git-fileinfo->marked info) t) 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) (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-add-file ()
  "Add marked file(s) to the index cache."
  (interactive)
  (let ((files (git-marked-files-state 'unknown)))
    (unless files
      (push (ewoc-data
             (git-add-status-file 'added (file-relative-name
                                          (read-file-name "File to add: " nil nil t))))
            files))
    (apply #'git-run-command nil nil "update-index" "--info-only" "--add" "--" (git-get-filenames files))
    (git-set-files-state files 'added)
    (git-refresh-files)))
 
(defun git-ignore-file ()
  "Add marked file(s) to the ignore list."
  (interactive)
  (let ((files (git-marked-files-state 'unknown)))
    (unless files
      (push (ewoc-data
             (git-add-status-file 'unknown (file-relative-name
                                            (read-file-name "File to ignore: " nil nil t))))
            files))
    (dolist (info files) (git-append-to-ignore (git-fileinfo->name info)))
    (git-set-files-state files 'ignored)
    (git-refresh-files)))
 
(defun git-remove-file ()
  "Remove the marked file(s)."
  (interactive)
  (let ((files (git-marked-files-state 'added 'modified 'unknown 'uptodate)))
    (unless files
      (push (ewoc-data
             (git-add-status-file 'unknown (file-relative-name
                                            (read-file-name "File to remove: " nil nil t))))
            files))
    (if (yes-or-no-p
         (format "Remove %d file%s? " (length files) (if (> (length files) 1) "s" "")))
        (progn
          (dolist (info files)
            (let ((name (git-fileinfo->name info)))
              (when (file-exists-p name) (delete-file name))))
          (apply #'git-run-command nil nil "update-index" "--info-only" "--remove" "--" (git-get-filenames files))
          ; remove unknown files from the list, set the others to deleted
          (ewoc-filter git-status
                       (lambda (info files)
                         (not (and (memq info files) (eq (git-fileinfo->state info) 'unknown))))
                       files)
          (git-set-files-state files 'deleted)
          (git-refresh-files)
          (unless (ewoc-nth git-status 0)  ; refresh header if list is empty
            (git-refresh-ewoc-hf git-status)))
      (message "Aborting"))))
 
(defun git-revert-file ()
  "Revert changes to the marked file(s)."
  (interactive)
  (let ((files (git-marked-files))
        added modified)
    (when (and files
               (yes-or-no-p
                (format "Revert %d file%s? " (length files) (if (> (length files) 1) "s" ""))))
      (dolist (info files)
        (case (git-fileinfo->state info)
          ('added (push info added))
          ('deleted (push info modified))
          ('unmerged (push info modified))
          ('modified (push info modified))))
      (when added
          (apply #'git-run-command nil nil "update-index" "--force-remove" "--" (git-get-filenames added))
          (git-set-files-state added 'unknown))
      (when modified
          (apply #'git-run-command nil nil "checkout" "HEAD" (git-get-filenames modified))
          (git-set-files-state modified 'uptodate))
      (git-refresh-files))))
 
(defun git-resolve-file ()
  "Resolve conflicts in marked file(s)."
  (interactive)
  (let ((files (git-marked-files-state 'unmerged)))
    (when files
      (apply #'git-run-command nil nil "update-index" "--" (git-get-filenames files))
      (git-set-files-state files 'modified)
      (git-refresh-files))))
 
(defun git-remove-handled ()
  "Remove handled files from the status list."
  (interactive)
  (ewoc-filter git-status
               (lambda (info)
                 (not (or (eq (git-fileinfo->state info) 'ignored)
                          (eq (git-fileinfo->state info) 'uptodate)))))
  (unless (ewoc-nth git-status 0)  ; refresh header if list is empty
    (git-refresh-ewoc-hf git-status)))
 
(defun git-setup-diff-buffer (buffer)
  "Setup a buffer for displaying a diff."
  (with-current-buffer buffer
    (diff-mode)
    (goto-char (point-min))
    (setq buffer-read-only t))
  (display-buffer 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)
  (error "Interactive diffs not implemented yet."))
 
(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-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 author-name author-email subject date msg)
  "Setup the log buffer for a commit."
  (unless git-status (error "Not in git-status buffer."))
  (let ((merge-heads (git-get-merge-heads))
        (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 "Parent: %s\n%s\n"
                            (git-rev-parse "HEAD")
                            (mapconcat (lambda (str) (concat "Parent: " str)) merge-heads "\n"))
                  ""))
        '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 ".dotest/msg")
             (insert-file-contents ".dotest/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)))))
 
(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 ".dotest/info")
          (with-temp-buffer
            (insert-file-contents ".dotest/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 author-name author-email subject date))
      (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 buffer-file-coding-system coding-system)
      (re-search-forward (regexp-quote (concat git-log-msg-separator "\n")) nil t))))
 
(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))))
    (find-file (git-fileinfo->name info))
    (when (eq 'unmerged (git-fileinfo->state info))
      (smerge-mode))))
 
(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)
  (let* ((status git-status)
         (pos (ewoc-locate status))
         (cur-name (and pos (git-fileinfo->name (ewoc-data pos)))))
    (unless status (error "Not in git-status buffer."))
    (git-clear-status status)
    (git-run-command nil nil "update-index" "--info-only" "--refresh")
    (if (git-empty-db-p)
        ; we need some special handling for an empty db
        (with-temp-buffer
          (git-run-command t nil "ls-files" "-z" "-t" "-c")
          (git-parse-ls-files status 'added))
      (with-temp-buffer
        (git-run-command t nil "diff-index" "-z" "-M" "HEAD")
        (git-parse-status status)))
      (with-temp-buffer
        (git-run-command t nil "ls-files" "-z" "-u")
        (git-parse-ls-unmerged status))
      (when (file-readable-p ".git/info/exclude")
        (with-temp-buffer
          (git-run-command t nil "ls-files" "-z" "-t" "-o"
                           "--exclude-from=.git/info/exclude"
                           (concat "--exclude-per-directory=" git-per-dir-ignore-file))
          (git-parse-ls-files status 'unknown)))
    (git-refresh-files)
    (git-refresh-ewoc-hf status)
    ; move point to the current file name if any
    (let ((node (and cur-name (git-find-status-file status cur-name))))
      (when node (ewoc-goto-node status node)))))
 
(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))
        (diff-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 "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 "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"   '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 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)
    (setq git-status-mode-map map)))
 
;; 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)
  (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))
                     (string-match "\\*git-status\\*$" (buffer-name buffer)))
            (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)))
    (message "%s is not a git working tree." dir)))
 
(defun git-help ()
  "Display help for Git mode."
  (interactive)
  (describe-function 'git-status-mode))
 
(provide 'git)
;;; git.el ends here