summaryrefslogtreecommitdiff
path: root/lisp/vc-dispatcher.el
blob: ffe3582763d041891419bf52e0d792fa872b5f9e (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
;;; vc-dispatcher.el -- generic command-dispatcher facility.

;; Copyright (C) 2008
;;   Free Software Foundation, Inc.

;; Author:     FSF (see below for full credits)
;; Maintainer: Eric S. Raymond <esr@thyrsus.com>
;; Keywords: tools

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Credits:

;; Designed and implemented by Eric S. Raymond, originally as part of VC mode.
;; Stefan Monnier and Dan Nicolaescu contributed substantial work on the
;; vc-dir front end.

;;; Commentary:

;; Goals:
;;
;; There is a class of front-ending problems that Emacs might be used
;; to address that involves selecting sets of files, or possibly
;; directories, and passing the selection set to slave commands.  The
;; prototypical example, from which this code is derived, is talking
;; to version-control systems. 
;;
;; vc-dispatcher.el is written to decouple the UI issues in such front
;; ends from their application-specific logic. It also provides a
;; service layer for running the slave commands either synchronously
;; or asynchronously and managing the message/error logs from the
;; command runs.
;;
;; Similar UI problems can be expected to come up in applications
;; areas other than VCSes; IDEs and document search are two obvious ones.
;; This mode is intended to ensure that the Emacs interfaces for all such
;; beasts are consistent and carefully designed.  But even if nothing
;; but VC ever uses it, getting the layer separation right will be
;; a valuable thing.

;; Dispatcher's universe:
;;
;; The universe consists of the file tree rooted at the current
;; directory. The dispatcher's upper layer deduces some subset 
;; of the file tree from the state of the currently visited buffer 
;; and returns that subset, presumably to a client mode.
;;
;; The user may be attempting to select one of three contexts: an
;; explicitly selected fileset, the current working directory, or a
;; global (null) context.  The user may be looking at either of two
;; different views; a buffer visiting a file, or a directory buffer
;; generated by vc-dispatcher.  The main UI problem connected with
;; this mode is that the user may need to be able to select any of
;; these three contexts from either view.
;;
;; The lower layer of this mode runs commands in subprocesses, either
;; synchronously or asynchronously.  Commands may be launched in one
;; of two ways: they may be run immediately, or the calling mode can
;; create a closure associated with a text-entry buffer, to be
;; executed when the user types C-c to ship the buffer contents. In
;; either case the command messages and error (if any) will remain
;; available in a status buffer.

;; Special behavior of dispatcher directory buffers:
;;
;; In dispatcher directory buffers, facilities to perform basic
;; navigation and selection operations are provided by keymap and menu
;; entries that dispatcher sets up itself, so they'll be uniform
;; across all dispatcher-using client modes.  Client modes are
;; expected to append to these to provide mode-specific bindings.
;;
;; The standard map associates a 'state' slot (that the client mode
;; may set) with each directory entry.  The dispatcher knows nothing
;; about the semantics of individual states, but mark and unmark commands
;; treat all entries with the same state as the currently selected one as 
;; a unit.

;; The interface
;;
;; The main interface to the lower level is vc-do-command.  This launches a
;; comand, synchronously or asynchronously, making the output available
;; in a command log buffer.  Two other functions, (vc-start-annotation) and
;; (vc-finish-logentry), allow you to associate a command closure with an
;; abbotation buffer so that when the user confirms the comment the closure
;; is run (with the comment as part of its context).
;;
;; The interface to the upper level has the two main entry points (vc-dir)
;; and (vc-dispatcher-selection-set) and a couple of convenience functions.
;; (vc-dir) sets up a dispatcher browsing buffer; (vc-dispatcher-selection-set)
;; returns a selection set of files, either the marked files in a browsing
;; buffer or the singleton set consisting of the file visited by the current
;; buffer (when that is appropriate).  It also does what is needed to ensure 
;; that on-disk files and the contents of their visiting Emacs buffers 
;; coincide.
;;
;; When the client mode adds a local mode-line-hook to a buffer, it
;; will be called with the buffer file name as argument whenever the
;; dispatcher resynchs the buffer.

;; To do:
;;
;; - vc-dir-kill-dir-status-process should not be specific to dir-status,
;;   it should work for other async commands as well (pull/push/...).
;;
;; - the *VC-log* buffer needs font-locking.
;;
;; - vc-dir needs mouse bindings.
;;
;; - vc-dir needs more key bindings for VC actions.
;;
;; - vc-dir toolbar needs more icons.
;;
;; - vc-dir-next-line should not print an "end of buffer" message when
;;   invoked with the cursor on the last file.
;;
;; - add commands to move to the prev/next directory in vc-dir.
;;
;; - document vc-dir in the manual.
;;

(provide 'vc-dispatcher)

(eval-when-compile
  (require 'cl))

;; General customization

(defcustom vc-logentry-check-hook nil
  "Normal hook run by `vc-finish-logentry'.
Use this to impose your own rules on the entry in addition to any the
dispatcher client mode imposes itself."
  :type 'hook
  :group 'vc)

(defcustom vc-delete-logbuf-window t
  "If non-nil, delete the *VC-log* buffer and window after each logical action.
If nil, bury that buffer instead.
This is most useful if you have multiple windows on a frame and would like to
preserve the setting."
  :type 'boolean
  :group 'vc)

(defcustom vc-command-messages nil
  "If non-nil, display run messages from back-end commands."
  :type 'boolean
  :group 'vc)

(defcustom vc-suppress-confirm nil
  "If non-nil, treat user as expert; suppress yes-no prompts on some things."
  :type 'boolean
  :group 'vc)

;; Variables the user doesn't need to know about.

(defvar vc-log-operation nil)
(defvar vc-log-after-operation-hook nil)
(defvar vc-log-fileset)
(defvar vc-log-extra)

;; In a log entry buffer, this is a local variable
;; that points to the buffer for which it was made
;; (either a file, or a VC directory buffer).
(defvar vc-parent-buffer nil)
(put 'vc-parent-buffer 'permanent-local t)
(defvar vc-parent-buffer-name nil)
(put 'vc-parent-buffer-name 'permanent-local t)

;; Common command execution logic

(defun vc-process-filter (p s)
  "An alternative output filter for async process P.
One difference with the default filter is that this inserts S after markers.
Another is that undo information is not kept."
  (let ((buffer (process-buffer p)))
    (when (buffer-live-p buffer)
      (with-current-buffer buffer
        (save-excursion
          (let ((buffer-undo-list t)
                (inhibit-read-only t))
            (goto-char (process-mark p))
            (insert s)
            (set-marker (process-mark p) (point))))))))

(defun vc-setup-buffer (buf)
  "Prepare BUF for executing a slave command and make it current."
  (let ((camefrom (current-buffer))
	(olddir default-directory))
    (set-buffer (get-buffer-create buf))
    (kill-all-local-variables)
    (set (make-local-variable 'vc-parent-buffer) camefrom)
    (set (make-local-variable 'vc-parent-buffer-name)
	 (concat " from " (buffer-name camefrom)))
    (setq default-directory olddir)
    (let ((buffer-undo-list t)
          (inhibit-read-only t))
      (erase-buffer))))

(defvar vc-sentinel-movepoint)          ;Dynamically scoped.

(defun vc-process-sentinel (p s)
  (let ((previous (process-get p 'vc-previous-sentinel))
        (buf (process-buffer p)))
    ;; Impatient users sometime kill "slow" buffers; check liveness
    ;; to avoid "error in process sentinel: Selecting deleted buffer".
    (when (buffer-live-p buf)
      (when previous (funcall previous p s))
      (with-current-buffer buf
        (setq mode-line-process
              (let ((status (process-status p)))
                ;; Leave mode-line uncluttered, normally.
                (unless (eq 'exit status)
                  (format " (%s)" status))))
        (let (vc-sentinel-movepoint)
          ;; Normally, we want async code such as sentinels to not move point.
          (save-excursion
            (goto-char (process-mark p))
            (let ((cmds (process-get p 'vc-sentinel-commands)))
              (process-put p 'vc-sentinel-commands nil)
              (dolist (cmd cmds)
                ;; Each sentinel may move point and the next one should be run
                ;; at that new point.  We could get the same result by having
                ;; each sentinel read&set process-mark, but since `cmd' needs
                ;; to work both for async and sync processes, this would be
                ;; difficult to achieve.
                (vc-exec-after cmd))))
          ;; But sometimes the sentinels really want to move point.
          (when vc-sentinel-movepoint
	    (let ((win (get-buffer-window (current-buffer) 0)))
	      (if (not win)
		  (goto-char vc-sentinel-movepoint)
		(with-selected-window win
		  (goto-char vc-sentinel-movepoint))))))))))

(defun vc-set-mode-line-busy-indicator ()
  (setq mode-line-process
	(concat " " (propertize "[waiting...]"
                                'face 'mode-line-emphasis
                                'help-echo
                                "A VC command is in progress in this buffer"))))

(defun vc-exec-after (code)
  "Eval CODE when the current buffer's process is done.
If the current buffer has no process, just evaluate CODE.
Else, add CODE to the process' sentinel."
  (let ((proc (get-buffer-process (current-buffer))))
    (cond
     ;; If there's no background process, just execute the code.
     ;; We used to explicitly call delete-process on exited processes,
     ;; but this led to timing problems causing process output to be
     ;; lost.  Terminated processes get deleted automatically
     ;; anyway. -- cyd
     ((or (null proc) (eq (process-status proc) 'exit))
      ;; Make sure we've read the process's output before going further.
      (when proc (accept-process-output proc))
      (eval code))
     ;; If a process is running, add CODE to the sentinel
     ((eq (process-status proc) 'run)
      (vc-set-mode-line-busy-indicator)
      (let ((previous (process-sentinel proc)))
        (unless (eq previous 'vc-process-sentinel)
          (process-put proc 'vc-previous-sentinel previous))
        (set-process-sentinel proc 'vc-process-sentinel))
      (process-put proc 'vc-sentinel-commands
                   ;; We keep the code fragments in the order given
                   ;; so that vc-diff-finish's message shows up in
                   ;; the presence of non-nil vc-command-messages.
                   (append (process-get proc 'vc-sentinel-commands)
                           (list code))))
     (t (error "Unexpected process state"))))
  nil)

(defvar vc-post-command-functions nil
  "Hook run at the end of `vc-do-command'.
Each function is called inside the buffer in which the command was run
and is passed 3 arguments: the COMMAND, the FILES and the FLAGS.")

(defvar w32-quote-process-args)

(defun vc-delistify (filelist)
  "Smash a FILELIST into a file list string suitable for info messages."
  ;; FIXME what about file names with spaces?
  (if (not filelist) "."  (mapconcat 'identity filelist " ")))

;;;###autoload
(defun vc-do-command (buffer okstatus command file-or-list &rest flags)
  "Execute a VC command, notifying user and checking for errors.
Output from COMMAND goes to BUFFER, or *vc* if BUFFER is nil or the
current buffer if BUFFER is t.  If the destination buffer is not
already current, set it up properly and erase it.  The command is
considered successful if its exit status does not exceed OKSTATUS (if
OKSTATUS is nil, that means to ignore error status, if it is `async', that
means not to wait for termination of the subprocess; if it is t it means to
ignore all execution errors).  FILE-OR-LIST is the name of a working file;
it may be a list of files or be nil (to execute commands that don't expect
a file name or set of files).  If an optional list of FLAGS is present,
that is inserted into the command line before the filename."
  ;; FIXME: file-relative-name can return a bogus result because
  ;; it doesn't look at the actual file-system to see if symlinks
  ;; come into play.
  (let* ((files
	  (mapcar (lambda (f) (file-relative-name (expand-file-name f)))
		  (if (listp file-or-list) file-or-list (list file-or-list))))
	 (full-command
	  ;; What we're doing here is preparing a version of the command
	  ;; for display in a debug-progess message.  If it's fewer than
	  ;; 20 characters display the entire command (without trailing
	  ;; newline).  Otherwise display the first 20 followed by an ellipsis.
	  (concat (if (string= (substring command -1) "\n")
		      (substring command 0 -1)
		    command)
		  " "
		  (vc-delistify (mapcar (lambda (s) (if (> (length s) 20) (concat (substring s 0 2) "...")  s)) flags))
		  " " (vc-delistify files))))
    (save-current-buffer
      (unless (or (eq buffer t)
		  (and (stringp buffer)
		       (string= (buffer-name) buffer))
		  (eq buffer (current-buffer)))
	(vc-setup-buffer (or buffer "*vc*")))
      ;; If there's some previous async process still running, just kill it.
      (let ((oldproc (get-buffer-process (current-buffer))))
        ;; If we wanted to wait for oldproc to finish before doing
        ;; something, we'd have used vc-eval-after.
        ;; Use `delete-process' rather than `kill-process' because we don't
        ;; want any of its output to appear from now on.
        (if oldproc (delete-process oldproc)))
      (let ((squeezed (remq nil flags))
	    (inhibit-read-only t)
	    (status 0))
	(when files
	  (setq squeezed (nconc squeezed files)))
	(let ((exec-path (append vc-path exec-path))
	      ;; Add vc-path to PATH for the execution of this command.
	      (process-environment
	       (cons (concat "PATH=" (getenv "PATH")
			     path-separator
			     (mapconcat 'identity vc-path path-separator))
		     process-environment))
	      (w32-quote-process-args t))
	  (when (and (eq okstatus 'async) (file-remote-p default-directory))
	    ;; start-process does not support remote execution
	    (setq okstatus nil))
	  (if (eq okstatus 'async)
	      ;; Run asynchronously.
	      (let ((proc
		     (let ((process-connection-type nil))
		       (apply 'start-file-process command (current-buffer)
                              command squeezed))))
		(if vc-command-messages
		    (message "Running %s in background..." full-command))
		;;(set-process-sentinel proc (lambda (p msg) (delete-process p)))
		(set-process-filter proc 'vc-process-filter)
		(vc-exec-after
		 `(if vc-command-messages
		      (message "Running %s in background... done" ',full-command))))
	    ;; Run synchrously
	    (when vc-command-messages
	      (message "Running %s in foreground..." full-command))
	    (let ((buffer-undo-list t))
	      (setq status (apply 'process-file command nil t nil squeezed)))
	    (when (and (not (eq t okstatus))
		       (or (not (integerp status))
			   (and okstatus (< okstatus status))))
              (unless (eq ?\s (aref (buffer-name (current-buffer)) 0))
                (pop-to-buffer (current-buffer))
                (goto-char (point-min))
                (shrink-window-if-larger-than-buffer))
	      (error "Running %s...FAILED (%s)" full-command
		     (if (integerp status) (format "status %d" status) status))))
	  ;; We're done.  But don't emit a status message if running
	  ;; asychronously, it would just mislead.
	  (if (and vc-command-messages (not (eq okstatus 'async)))
	      (message "Running %s...OK = %d" full-command status)))
	(vc-exec-after
	 `(run-hook-with-args 'vc-post-command-functions
			      ',command ',file-or-list ',flags))
	status))))

;; These functions are used to ensure that the view the user sees is up to date
;; even if the dispatcher client mode has messed with file contents (as in, 
;; for example, VCS keyword expansion).

(declare-function view-mode-exit "view" (&optional return-to-alist exit-action all-win))

(defun vc-position-context (posn)
  "Save a bit of the text around POSN in the current buffer.
Used to help us find the corresponding position again later
if markers are destroyed or corrupted."
  ;; A lot of this was shamelessly lifted from Sebastian Kremer's
  ;; rcs.el mode.
  (list posn
	(buffer-size)
	(buffer-substring posn
			  (min (point-max) (+ posn 100)))))

(defun vc-find-position-by-context (context)
  "Return the position of CONTEXT in the current buffer.
If CONTEXT cannot be found, return nil."
  (let ((context-string (nth 2 context)))
    (if (equal "" context-string)
	(point-max)
      (save-excursion
	(let ((diff (- (nth 1 context) (buffer-size))))
	  (when (< diff 0) (setq diff (- diff)))
	  (goto-char (nth 0 context))
	  (if (or (search-forward context-string nil t)
		  ;; Can't use search-backward since the match may continue
		  ;; after point.
		  (progn (goto-char (- (point) diff (length context-string)))
			 ;; goto-char doesn't signal an error at
			 ;; beginning of buffer like backward-char would
			 (search-forward context-string nil t)))
	      ;; to beginning of OSTRING
	      (- (point) (length context-string))))))))

(defun vc-context-matches-p (posn context)
  "Return t if POSN matches CONTEXT, nil otherwise."
  (let* ((context-string (nth 2 context))
	 (len (length context-string))
	 (end (+ posn len)))
    (if (> end (1+ (buffer-size)))
	nil
      (string= context-string (buffer-substring posn end)))))

(defun vc-buffer-context ()
  "Return a list (POINT-CONTEXT MARK-CONTEXT REPARSE).
Used by `vc-restore-buffer-context' to later restore the context."
  (let ((point-context (vc-position-context (point)))
	;; Use mark-marker to avoid confusion in transient-mark-mode.
	(mark-context (when (eq (marker-buffer (mark-marker)) (current-buffer))
			 (vc-position-context (mark-marker))))
	;; Make the right thing happen in transient-mark-mode.
	(mark-active nil))
    (list point-context mark-context nil)))

(defun vc-restore-buffer-context (context)
  "Restore point/mark, and reparse any affected compilation buffers.
CONTEXT is that which `vc-buffer-context' returns."
  (let ((point-context (nth 0 context))
	(mark-context (nth 1 context)))
    ;; if necessary, restore point and mark
    (if (not (vc-context-matches-p (point) point-context))
	(let ((new-point (vc-find-position-by-context point-context)))
	  (when new-point (goto-char new-point))))
    (and mark-active
         mark-context
         (not (vc-context-matches-p (mark) mark-context))
         (let ((new-mark (vc-find-position-by-context mark-context)))
           (when new-mark (set-mark new-mark))))))

(defun vc-revert-buffer-internal (&optional arg no-confirm)
  "Revert buffer, keeping point and mark where user expects them.
Try to be clever in the face of changes due to expanded version-control
key words.  This is important for typeahead to work as expected.
ARG and NO-CONFIRM are passed on to `revert-buffer'."
  (interactive "P")
  (widen)
  (let ((context (vc-buffer-context)))
    ;; Use save-excursion here, because it may be able to restore point
    ;; and mark properly even in cases where vc-restore-buffer-context
    ;; would fail.  However, save-excursion might also get it wrong --
    ;; in this case, vc-restore-buffer-context gives it a second try.
    (save-excursion
      ;; t means don't call normal-mode;
      ;; that's to preserve various minor modes.
      (revert-buffer arg no-confirm t))
    (vc-restore-buffer-context context)))

(defun vc-resynch-window (file &optional keep noquery)
  "If FILE is in the current buffer, either revert or unvisit it.
The choice between revert (to see expanded keywords) and unvisit
depends on KEEP.  NOQUERY if non-nil inhibits confirmation for
reverting.  NOQUERY should be t *only* if it is known the only
difference between the buffer and the file is due to
modifications by the dispatcher client code, rather than user
editing!"
  (and (string= buffer-file-name file)
       (if keep
	   (progn
	     (vc-revert-buffer-internal t noquery)
             ;; TODO: Adjusting view mode might no longer be necessary
             ;; after RMS change to files.el of 1999-08-08.  Investigate
             ;; this when we install the new VC.
             (and view-read-only
                  (if (file-writable-p file)
                      (and view-mode
                           (let ((view-old-buffer-read-only nil))
                             (view-mode-exit)))
                    (and (not view-mode)
                         (not (eq (get major-mode 'mode-class) 'special))
                         (view-mode-enter))))
	     (run-hook-with-args 'modeline-hook buffer-file-name))
	 (kill-buffer (current-buffer)))))

(defun vc-resynch-buffer (file &optional keep noquery)
  "If FILE is currently visited, resynch its buffer."
  (if (string= buffer-file-name file)
      (vc-resynch-window file keep noquery)
    (let ((buffer (get-file-buffer file)))
      (when buffer
	(with-current-buffer buffer
	  (vc-resynch-window file keep noquery)))))
  (vc-directory-resynch-file file))

;; Command closures

(defun vc-start-logentry (files extra comment initial-contents msg action &optional after-hook)
  "Accept a comment for an operation on FILES with extra data EXTRA.
If COMMENT is nil, pop up a VC-log buffer, emit MSG, and set the
action on close to ACTION.  If COMMENT is a string and
INITIAL-CONTENTS is non-nil, then COMMENT is used as the initial
contents of the log entry buffer.  If COMMENT is a string and
INITIAL-CONTENTS is nil, do action immediately as if the user had
entered COMMENT.  If COMMENT is t, also do action immediately with an
empty comment.  Remember the file's buffer in `vc-parent-buffer'
\(current one if no file).  AFTER-HOOK specifies the local value
for `vc-log-after-operation-hook'."
  (let ((parent
         (if (vc-dispatcher-browsing)
             ;; If we are called from a directory browser, the parent buffer is
             ;; the current buffer.
             (current-buffer)
           (if (and files (equal (length files) 1))
               (get-file-buffer (car files))
             (current-buffer)))))
    (if (and comment (not initial-contents))
	(set-buffer (get-buffer-create "*VC-log*"))
      (pop-to-buffer (get-buffer-create "*VC-log*")))
    (set (make-local-variable 'vc-parent-buffer) parent)
    (set (make-local-variable 'vc-parent-buffer-name)
	 (concat " from " (buffer-name vc-parent-buffer)))
    (vc-log-edit files)
    (make-local-variable 'vc-log-after-operation-hook)
    (when after-hook
      (setq vc-log-after-operation-hook after-hook))
    (setq vc-log-operation action)
    (setq vc-log-extra extra)
    (when comment
      (erase-buffer)
      (when (stringp comment) (insert comment)))
    (if (or (not comment) initial-contents)
	(message "%s  Type C-c C-c when done" msg)
      (vc-finish-logentry (eq comment t)))))

(defun vc-finish-logentry (&optional nocomment)
  "Complete the operation implied by the current log entry.
Use the contents of the current buffer as a check-in or registration
comment.  If the optional arg NOCOMMENT is non-nil, then don't check
the buffer contents as a comment."
  (interactive)
  ;; Check and record the comment, if any.
  (unless nocomment
    (run-hooks 'vc-logentry-check-hook))
  ;; Sync parent buffer in case the user modified it while editing the comment.
  ;; But not if it is a vc-directory buffer.
  (with-current-buffer vc-parent-buffer
    (or (vc-dispatcher-browsing) (vc-buffer-sync)))
  (unless vc-log-operation
    (error "No log operation is pending"))
  ;; save the parameters held in buffer-local variables
  (let ((log-operation vc-log-operation)
	(log-fileset vc-log-fileset)
	(log-extra vc-log-extra)
	(log-entry (buffer-string))
	(after-hook vc-log-after-operation-hook)
	(tmp-vc-parent-buffer vc-parent-buffer))
    (pop-to-buffer vc-parent-buffer)
    ;; OK, do it to it
    (save-excursion
      (funcall log-operation
	       log-fileset
	       log-extra
	       log-entry))
    ;; Remove checkin window (after the checkin so that if that fails
    ;; we don't zap the *VC-log* buffer and the typing therein).
    ;; -- IMO this should be replaced with quit-window
    (let ((logbuf (get-buffer "*VC-log*")))
      (cond ((and logbuf vc-delete-logbuf-window)
	     (delete-windows-on logbuf (selected-frame))
	     ;; Kill buffer and delete any other dedicated windows/frames.
	     (kill-buffer logbuf))
	    (logbuf (pop-to-buffer "*VC-log*")
		    (bury-buffer)
		    (pop-to-buffer tmp-vc-parent-buffer))))
    ;; Now make sure we see the expanded headers
    (when log-fileset
      (mapc
       (lambda (file) (vc-resynch-buffer file vc-keep-workfiles t))
       log-fileset))
    (when (vc-dispatcher-browsing)
      (vc-dir-move-to-goal-column))
    (run-hooks after-hook 'vc-finish-logentry-hook)))

;; The ewoc-based vc-directory implementation

(defcustom vc-dir-mode-hook nil
  "Normal hook run by `vc-dir-mode'.
See `run-hooks'."
  :type 'hook
  :group 'vc)

;; Used to store information for the files displayed in the *VC status* buffer.
;; Each item displayed corresponds to one of these defstructs.
(defstruct (vc-dir-fileinfo
            (:copier nil)
            (:type list)            ;So we can use `member' on lists of FIs.
            (:constructor
             ;; We could define it as an alias for `list'.
	     vc-dir-create-fileinfo (name state &optional extra marked directory))
            (:conc-name vc-dir-fileinfo->))
  name                                  ;Keep it as first, for `member'.
  state
  ;; For storing client-mode specific information.
  extra
  marked
  ;; To keep track of not updated files during a global refresh
  needs-update
  ;; To distinguish files and directories.
  directory)

;; Used to describe a dispatcher client mode.  
(defstruct (vc-client-object
            (:copier nil)
            (:constructor
	     vc-create-client-object (name 
				      headers 
				      file-to-info
				      file-to-state 
				      file-to-extra
				      updater))
            (:conc-name vc-client-object->))
  name 
  headers
  file-to-info
  file-to-state 
  file-to-extra
  updater)

(defvar vc-ewoc nil)
(defvar vc-dir-process-buffer nil
  "The buffer used for the asynchronous call that computes the VC status.")

(defun vc-dir-move-to-goal-column ()
  ;; Used to keep the cursor on the file name column.
  (beginning-of-line)
  ;; Must be in sync with vc-default-status-printer.
  (forward-char 25))

(defun vc-dir-prepare-status-buffer (dir &optional create-new)
  "Find a *vc-dir* buffer showing DIR, or create a new one."
  (setq dir (expand-file-name dir))
  (let* ((bname "*vc-dir*")
	 ;; Look for another *vc-dir* buffer visiting the same directory.
	 (buf (save-excursion
		(unless create-new
		  (dolist (buffer (buffer-list))
		    (set-buffer buffer)
		    (when (and (vc-dispatcher-browsing)
			       (string= (expand-file-name default-directory) dir))
		      (return buffer)))))))
    (or buf
        ;; Create a new *vc-dir* buffer.
        (with-current-buffer (create-file-buffer bname)
          (cd dir)
          (vc-setup-buffer (current-buffer))
          ;; Reset the vc-parent-buffer-name so that it does not appear
          ;; in the mode-line.
          (setq vc-parent-buffer-name nil)
          (current-buffer)))))

(defvar vc-dir-menu-map
  (let ((map (make-sparse-keymap "VC-dir")))
    (define-key map [quit]
      '(menu-item "Quit" quit-window
		  :help "Quit"))
    (define-key map [kill]
      '(menu-item "Kill Update Command" vc-dir-kill-dir-status-process
		  :enable (vc-dir-busy)
		  :help "Kill the command that updates VC status buffer"))
    (define-key map [refresh]
      '(menu-item "Refresh" vc-dir-refresh
		  :enable (not (vc-dir-busy))
		  :help "Refresh the contents of the VC status buffer"))
    ;; Movement.
    (define-key map [sepmv] '("--"))
    (define-key map [next-line]
      '(menu-item "Next line" vc-dir-next-line
		  :help "Go to the next line" :keys "n"))
    (define-key map [previous-line]
      '(menu-item "Previous line" vc-dir-previous-line
		  :help "Go to the previous line"))
    ;; Marking.
    (define-key map [sepmrk] '("--"))
    (define-key map [unmark-all]
      '(menu-item "Unmark All" vc-dir-unmark-all-files
		  :help "Unmark all files that are in the same state as the current file\
\nWith prefix argument unmark all files"))
    (define-key map [unmark-previous]
      '(menu-item "Unmark previous " vc-dir-unmark-file-up
		  :help "Move to the previous line and unmark the file"))

    (define-key map [mark-all]
      '(menu-item "Mark All" vc-dir-mark-all-files
		  :help "Mark all files that are in the same state as the current file\
\nWith prefix argument mark all files"))
    (define-key map [unmark]
      '(menu-item "Unmark" vc-dir-unmark
		  :help "Unmark the current file or all files in the region"))

    (define-key map [mark]
      '(menu-item "Mark" vc-dir-mark
		  :help "Mark the current file or all files in the region"))

    (define-key map [sepopn] '("--"))
    (define-key map [open-other]
      '(menu-item "Open in other window" vc-dir-find-file-other-window
		  :help "Find the file on the current line, in another window"))
    (define-key map [open]
      '(menu-item "Open file" vc-dir-find-file
		  :help "Find the file on the current line"))
    map)
  "Menu for dispatcher status")

(defalias 'vc-dir-menu-map vc-dir-menu-map)

(defvar vc-dir-mode-map
  (let ((map (make-keymap)))
    (suppress-keymap map)
    ;; Marking.
    (define-key map "m" 'vc-dir-mark)
    (define-key map "M" 'vc-dir-mark-all-files)
    (define-key map "u" 'vc-dir-unmark)
    (define-key map "U" 'vc-dir-unmark-all-files)
    (define-key map "\C-?" 'vc-dir-unmark-file-up)
    (define-key map "\M-\C-?" 'vc-dir-unmark-all-files)
    ;; Movement.
    (define-key map "n" 'vc-dir-next-line)
    (define-key map " " 'vc-dir-next-line)
    (define-key map "\t" 'vc-dir-next-line)
    (define-key map "p" 'vc-dir-previous-line)
    (define-key map [backtab] 'vc-dir-previous-line)
    ;; The remainder.
    (define-key map "f" 'vc-dir-find-file)
    (define-key map "\C-m" 'vc-dir-find-file)
    (define-key map "o" 'vc-dir-find-file-other-window)
    (define-key map "q" 'quit-window)
    (define-key map "g" 'vc-dir-refresh)
    (define-key map "\C-c\C-c" 'vc-dir-kill-dir-status-process)
    (define-key map [(down-mouse-3)] 'vc-dir-menu)
    (define-key map [(mouse-2)] 'vc-dir-toggle-mark)

    ;; FIXME: Calls back into vc.el
    ;; Hook up the menu.
    (define-key map [menu-bar vc-dir-mode]
      '(menu-item
	;; This is used so that client modes can add mode-specific
	;; menu items to vc-dir-menu-map.
	"VC Status" vc-dir-menu-map :filter vc-dir-menu-map-filter))
    map)
  "Keymap for VC status")

(defmacro vc-at-event (event &rest body)
  "Evaluate `body' wich point located at event-start of `event'.
If `body' uses `event', it should be a variable,
 otherwise it will be evaluated twice."
  (let ((posn (gensym "vc-at-event-posn")))
    `(let ((,posn (event-start ,event)))
       (save-excursion
         (set-buffer (window-buffer (posn-window ,posn)))
         (goto-char (posn-point ,posn))
         ,@body))))

(defun vc-dir-menu (e)
  "Popup the VC status menu."
  (interactive "e")
  (vc-at-event e (popup-menu vc-dir-menu-map e)))

(defvar vc-dir-tool-bar-map
  (let ((map (make-sparse-keymap)))
    (tool-bar-local-item-from-menu 'vc-dir-find-file "open"
				   map vc-dir-mode-map)
    (tool-bar-local-item "bookmark_add"
			 'vc-dir-toggle-mark 'vc-dir-toggle-mark map
			 :help "Toggle mark on current item")
    (tool-bar-local-item-from-menu 'vc-dir-previous-line "left-arrow"
				   map vc-dir-mode-map
				   :rtl "right-arrow")
    (tool-bar-local-item-from-menu 'vc-dir-next-line "right-arrow"
				   map vc-dir-mode-map
				   :rtl "left-arrow")
    (tool-bar-local-item-from-menu 'vc-print-log "info"
				   map vc-dir-mode-map)
    (tool-bar-local-item-from-menu 'vc-dir-refresh "refresh"
				   map vc-dir-mode-map)
    (tool-bar-local-item-from-menu 'nonincremental-search-forward
				   "search" map)
    (tool-bar-local-item-from-menu 'vc-dir-kill-dir-status-process "cancel"
				   map vc-dir-mode-map)
    (tool-bar-local-item-from-menu 'quit-window "exit"
				   map vc-dir-mode-map)
    map))

(defun vc-dir-update (entries buffer &optional noinsert)
  "Update BUFFER's ewoc from the list of ENTRIES.
If NOINSERT, ignore elements on ENTRIES which are not in the ewoc."
  ;; Add ENTRIES to the vc-dir buffer BUFFER.
  (with-current-buffer buffer
    ;; Insert the entries sorted by name into the ewoc.
    ;; We assume the ewoc is sorted too, which should be the
    ;; case if we always add entries with vc-dir-update.
    (setq entries
	  ;; Sort: first files and then subdirectories.
	  ;; XXX: this is VERY inefficient, it computes the directory
	  ;; names too many times
	  (sort entries
		(lambda (entry1 entry2)
		  (let ((dir1 (file-name-directory (expand-file-name (car entry1))))
			(dir2 (file-name-directory (expand-file-name (car entry2)))))
		    (cond
		     ((string< dir1 dir2) t)
		     ((not (string= dir1 dir2)) nil)
		     ((string< (car entry1) (car entry2))))))))
    ;; Insert directory entries in the right places.
    (let ((entry (car entries))
	  (node (ewoc-nth vc-ewoc 0)))
      ;; Insert . if it is not present.
      (unless node
	(let ((rd (file-relative-name default-directory)))
	  (ewoc-enter-last
	   vc-ewoc (vc-dir-create-fileinfo
		    rd nil nil nil (expand-file-name default-directory))))
	(setq node (ewoc-nth vc-ewoc 0)))

      (while (and entry node)
	(let* ((entryfile (car entry))
	       (entrydir (file-name-directory (expand-file-name entryfile)))
	       (nodedir
		(or (vc-dir-fileinfo->directory (ewoc-data node))
		    (file-name-directory
		     (expand-file-name
		      (vc-dir-fileinfo->name (ewoc-data node)))))))
	  (cond
	   ;; First try to find the directory.
	   ((string-lessp nodedir entrydir)
	    (setq node (ewoc-next vc-ewoc node)))
	   ((string-equal nodedir entrydir)
	    ;; Found the directory, find the place for the file name.
	    (let ((nodefile (vc-dir-fileinfo->name (ewoc-data node))))
	      (cond
	       ((string-lessp nodefile entryfile)
		(setq node (ewoc-next vc-ewoc node)))
	       ((string-equal nodefile entryfile)
		(setf (vc-dir-fileinfo->state (ewoc-data node)) (nth 1 entry))
		(setf (vc-dir-fileinfo->extra (ewoc-data node)) (nth 2 entry))
		(setf (vc-dir-fileinfo->needs-update (ewoc-data node)) nil)
		(ewoc-invalidate vc-ewoc node)
		(setq entries (cdr entries) entry (car entries))
		(setq node (ewoc-next vc-ewoc node)))
	       (t
		(ewoc-enter-before vc-ewoc node
				   (apply 'vc-dir-create-fileinfo entry))
		(setq entries (cdr entries) entry (car entries))))))
	   (t
	    ;; We need to insert a directory node
	    (let ((rd (file-relative-name entrydir)))
	      (ewoc-enter-last
	       vc-ewoc (vc-dir-create-fileinfo rd nil nil nil entrydir)))
	    ;; Now insert the node itself.
	    (ewoc-enter-before vc-ewoc node
			       (apply 'vc-dir-create-fileinfo entry))
	    (setq entries (cdr entries) entry (car entries))))))
      ;; We're past the last node, all remaining entries go to the end.
      (unless (or node noinsert)
	(let* ((lastnode (ewoc-nth vc-ewoc -1))
	       (lastdir
		(or (vc-dir-fileinfo->directory (ewoc-data lastnode))
		    (file-name-directory
		     (expand-file-name
		      (vc-dir-fileinfo->name (ewoc-data lastnode)))))))
	  (dolist (entry entries)
	    (let ((entrydir (file-name-directory (expand-file-name (car entry)))))
	      ;; Insert a directory node if needed.
	      (unless (string-equal lastdir entrydir)
		(setq lastdir entrydir)
		(let ((rd (file-relative-name entrydir)))
		  (ewoc-enter-last
		   vc-ewoc (vc-dir-create-fileinfo rd nil nil nil entrydir))))
	      ;; Now insert the node itself.
	      (ewoc-enter-last vc-ewoc
			       (apply 'vc-dir-create-fileinfo entry)))))))))

(defun vc-dir-busy ()
  (and (buffer-live-p vc-dir-process-buffer)
       (get-buffer-process vc-dir-process-buffer)))

(defun vc-dir-kill-dir-status-process ()
  "Kill the temporary buffer and associated process."
  (interactive)
  (when (buffer-live-p vc-dir-process-buffer)
    (let ((proc (get-buffer-process vc-dir-process-buffer)))
      (when proc (delete-process proc))
      (setq vc-dir-process-buffer nil)
      (setq mode-line-process nil))))

(defun vc-dir-kill-query ()
  ;; Make sure that when the VC status buffer is killed the update
  ;; process running in background is also killed.
  (if (vc-dir-busy)
    (when (y-or-n-p "Status update process running, really kill status buffer?")
      (vc-dir-kill-dir-status-process)
      t)
    t))

(defun vc-dir-next-line (arg)
  "Go to the next line.
If a prefix argument is given, move by that many lines."
  (interactive "p")
  (ewoc-goto-next vc-ewoc arg)
  (vc-dir-move-to-goal-column))

(defun vc-dir-previous-line (arg)
  "Go to the previous line.
If a prefix argument is given, move by that many lines."
  (interactive "p")
  (ewoc-goto-prev vc-ewoc arg)
  (vc-dir-move-to-goal-column))

(defun vc-dir-mark-unmark (mark-unmark-function)
  (if (use-region-p)
      (let ((firstl (line-number-at-pos (region-beginning)))
	    (lastl (line-number-at-pos (region-end))))
	(save-excursion
	  (goto-char (region-beginning))
	  (while (<= (line-number-at-pos) lastl)
	    (funcall mark-unmark-function))))
    (funcall mark-unmark-function)))

(defun vc-dir-parent-marked-p (arg)
  ;; Return nil if none of the parent directories of arg is marked.
  (let* ((argdata (ewoc-data arg))
	 (argdir
	  (let ((crtdir (vc-dir-fileinfo->directory argdata)))
	    (if crtdir
		crtdir
	      (file-name-directory (expand-file-name
				    (vc-dir-fileinfo->name argdata))))))
	 (arglen (length argdir))
	 (crt arg)
	 data dir)
    ;; Go through the predecessors, checking if any directory that is
    ;; a parent is marked.
    (while (setq crt (ewoc-prev vc-ewoc crt))
      (setq data (ewoc-data crt))
      (setq dir
	    (let ((crtdir (vc-dir-fileinfo->directory data)))
	      (if crtdir
		  crtdir
		(file-name-directory (expand-file-name
				      (vc-dir-fileinfo->name data))))))

      (when (and (vc-dir-fileinfo->directory data)
		 (string-equal (substring argdir 0 (length dir)) dir))
	(when (vc-dir-fileinfo->marked data)
	  (error "Cannot mark `%s', parent directory `%s' marked"
		 (vc-dir-fileinfo->name argdata)
		 (vc-dir-fileinfo->name data)))))
    nil))

(defun vc-dir-children-marked-p (arg)
  ;; Return nil if none of the children of arg is marked.
  (let* ((argdata (ewoc-data arg))
	 (argdir (vc-dir-fileinfo->directory argdata))
	 (arglen (length argdir))
	 (is-child t)
	 (crt arg)
	 data dir)
    (while (and is-child (setq crt (ewoc-next vc-ewoc crt)))
      (setq data (ewoc-data crt))
      (setq dir
	    (let ((crtdir (vc-dir-fileinfo->directory data)))
	      (if crtdir
		  crtdir
		(file-name-directory (expand-file-name
				      (vc-dir-fileinfo->name data))))))
      (if (string-equal argdir (substring dir 0 arglen))
	  (when (vc-dir-fileinfo->marked data)
	    (error "Cannot mark `%s', child `%s' marked"
		   (vc-dir-fileinfo->name argdata)
		   (vc-dir-fileinfo->name data)))
	;; We are done, we got to an entry that is not a child of `arg'.
	(setq is-child nil)))
    nil))

(defun vc-dir-mark-file (&optional arg)
  ;; Mark ARG or the current file and move to the next line.
  (let* ((crt (or arg (ewoc-locate vc-ewoc)))
         (file (ewoc-data crt))
	 (isdir (vc-dir-fileinfo->directory file)))
    (when (or (and isdir (not (vc-dir-children-marked-p crt)))
	      (and (not isdir) (not (vc-dir-parent-marked-p crt))))
      (setf (vc-dir-fileinfo->marked file) t)
      (ewoc-invalidate vc-ewoc crt)
      (unless (or arg (mouse-event-p last-command-event))
	(vc-dir-next-line 1)))))

(defun vc-dir-mark ()
  "Mark the current file or all files in the region.
If the region is active, mark all the files in the region.
Otherwise mark the file on the current line and move to the next
line."
  (interactive)
  (vc-dir-mark-unmark 'vc-dir-mark-file))

(defun vc-dir-mark-all-files (arg)
  "Mark all files with the same state as the current one.
With a prefix argument mark all files.
If the current entry is a directory, mark all child files.

The VC commands operate on files that are on the same state.
This command is intended to make it easy to select all files that
share the same state."
  (interactive "P")
  (if arg
      ;; Mark all files.
      (progn
	;; First check that no directory is marked, we can't mark
	;; files in that case.
	(ewoc-map
	 (lambda (filearg)
	   (when (and (vc-dir-fileinfo->directory filearg)
		      (vc-dir-fileinfo->directory filearg))
	     (error "Cannot mark all files, directory `%s' marked"
		    (vc-dir-fileinfo->name filearg))))
	 vc-ewoc)
	(ewoc-map
	 (lambda (filearg)
	   (unless (vc-dir-fileinfo->marked filearg)
	     (setf (vc-dir-fileinfo->marked filearg) t)
	     t))
	 vc-ewoc))
    (let ((data (ewoc-data (ewoc-locate vc-ewoc))))
      (if (vc-dir-fileinfo->directory data)
	  ;; It's a directory, mark child files.
	  (let ((crt (ewoc-locate vc-ewoc)))
	    (unless (vc-dir-children-marked-p crt)
	      (while (setq crt (ewoc-next vc-ewoc crt))
		(let ((crt-data (ewoc-data crt)))
		  (unless (vc-dir-fileinfo->directory crt-data)
		    (setf (vc-dir-fileinfo->marked crt-data) t)
		    (ewoc-invalidate vc-ewoc crt))))))
	;; It's a file
	(let ((state (vc-dir-fileinfo->state data))
	      (crt (ewoc-nth vc-ewoc 0)))
	  (while crt
	    (let ((crt-data (ewoc-data crt)))
	      (when (and (not (vc-dir-fileinfo->marked crt-data))
			 (eq (vc-dir-fileinfo->state crt-data) state)
			 (not (vc-dir-fileinfo->directory crt-data)))
		(vc-dir-mark-file crt)))
	    (setq crt (ewoc-next vc-ewoc crt))))))))

(defun vc-dir-unmark-file ()
  ;; Unmark the current file and move to the next line.
  (let* ((crt (ewoc-locate vc-ewoc))
         (file (ewoc-data crt)))
    (setf (vc-dir-fileinfo->marked file) nil)
    (ewoc-invalidate vc-ewoc crt)
    (unless (mouse-event-p last-command-event)
      (vc-dir-next-line 1))))

(defun vc-dir-unmark ()
  "Unmark the current file or all files in the region.
If the region is active, unmark all the files in the region.
Otherwise mark the file on the current line and move to the next
line."
  (interactive)
  (vc-dir-mark-unmark 'vc-dir-unmark-file))

(defun vc-dir-unmark-file-up ()
  "Move to the previous line and unmark the file."
  (interactive)
  ;; If we're on the first line, we won't move up, but we will still
  ;; remove the mark.  This seems a bit odd but it is what buffer-menu
  ;; does.
  (let* ((prev (ewoc-goto-prev vc-ewoc 1))
	 (file (ewoc-data prev)))
    (setf (vc-dir-fileinfo->marked file) nil)
    (ewoc-invalidate vc-ewoc prev)
    (vc-dir-move-to-goal-column)))

(defun vc-dir-unmark-all-files (arg)
  "Unmark all files with the same state as the current one.
With a prefix argument unmark all files.
If the current entry is a directory, unmark all the child files.

The VC commands operate on files that are on the same state.
This command is intended to make it easy to deselect all files
that share the same state."
  (interactive "P")
  (if arg
      (ewoc-map
       (lambda (filearg)
	 (when (vc-dir-fileinfo->marked filearg)
	   (setf (vc-dir-fileinfo->marked filearg) nil)
	   t))
       vc-ewoc)
    (let* ((crt (ewoc-locate vc-ewoc))
	   (data (ewoc-data crt)))
      (if (vc-dir-fileinfo->directory data)
	  ;; It's a directory, unmark child files.
	  (while (setq crt (ewoc-next vc-ewoc crt))
	    (let ((crt-data (ewoc-data crt)))
	      (unless (vc-dir-fileinfo->directory crt-data)
		(setf (vc-dir-fileinfo->marked crt-data) nil)
		(ewoc-invalidate vc-ewoc crt))))
	;; It's a file
	(let ((crt-state (vc-dir-fileinfo->state (ewoc-data crt))))
	  (ewoc-map
	   (lambda (filearg)
	     (when (and (vc-dir-fileinfo->marked filearg)
			(eq (vc-dir-fileinfo->state filearg) crt-state))
	       (setf (vc-dir-fileinfo->marked filearg) nil)
	       t))
	   vc-ewoc))))))

(defun vc-dir-toggle-mark-file ()
  (let* ((crt (ewoc-locate vc-ewoc))
         (file (ewoc-data crt)))
    (if (vc-dir-fileinfo->marked file)
	(vc-dir-unmark-file)
      (vc-dir-mark-file))))

(defun vc-dir-toggle-mark (e)
  (interactive "e")
  (vc-at-event e (vc-dir-mark-unmark 'vc-dir-toggle-mark-file)))

(defun vc-dir-delete-file ()
  "Delete the marked files, or the current file if no marks."
  (interactive)
  (mapc 'vc-delete-file (or (vc-dir-marked-files)
                            (list (vc-dir-current-file)))))

(defun vc-dir-find-file ()
  "Find the file on the current line."
  (interactive)
  (find-file (vc-dir-current-file)))

(defun vc-dir-find-file-other-window ()
  "Find the file on the current line, in another window."
  (interactive)
  (find-file-other-window (vc-dir-current-file)))

(defun vc-dir-current-file ()
  (let ((node (ewoc-locate vc-ewoc)))
    (unless node
      (error "No file available."))
    (expand-file-name (vc-dir-fileinfo->name (ewoc-data node)))))

(defun vc-dir-marked-files ()
  "Return the list of marked files."
  (mapcar
   (lambda (elem) (expand-file-name (vc-dir-fileinfo->name elem)))
   (ewoc-collect vc-ewoc 'vc-dir-fileinfo->marked)))

(defun vc-dir-marked-only-files ()
  "Return the list of marked files, For marked directories return child files."
  (let ((crt (ewoc-nth vc-ewoc 0))
	result)
    (while crt
      (let ((crt-data (ewoc-data crt)))
	(if (vc-dir-fileinfo->marked crt-data)
	    (if (vc-dir-fileinfo->directory crt-data)
		(let* ((dir (vc-dir-fileinfo->directory crt-data))
		       (dirlen (length dir))
		       data)
		  (while
		      (and (setq crt (ewoc-next vc-ewoc crt))
			   (string-equal
			    (substring
			     (progn
			       (setq data (ewoc-data crt))
			       (let ((crtdir (vc-dir-fileinfo->directory data)))
				 (if crtdir
				     crtdir
				   (file-name-directory
				    (expand-file-name
				     (vc-dir-fileinfo->name data))))))
			     0 dirlen)
			    dir))
		    (unless (vc-dir-fileinfo->directory data)
		      (push (vc-dir-fileinfo->name data) result))))
	      (push (expand-file-name (vc-dir-fileinfo->name crt-data)) result)
	      (setq crt (ewoc-next vc-ewoc crt)))
	  (setq crt (ewoc-next vc-ewoc crt)))))
    result))
 
(defun vc-directory-resynch-file (&optional fname)
  "Update the entries for FILE in any directory buffers that list it."
  (let ((file (or fname (expand-file-name buffer-file-name))))
    ;; The vc-dir case
    (let ((found-vc-dir-buf nil))
      (save-excursion
	(dolist (status-buf (buffer-list))
	  (set-buffer status-buf)
	  ;; look for a vc-dir buffer that might show this file.
	  (when (eq major-mode 'vc-dir-mode)
	    (setq found-vc-dir-buf t)
	    (let ((ddir (expand-file-name default-directory)))
	      ;; This test is cvs-string-prefix-p
	      (when (eq t (compare-strings file nil (length ddir) ddir nil nil))
		(let*
		    ((file-short (substring file (length ddir)))
		     (state
		      (funcall (vc-client-object->file-to-state vc-client-mode)
			       file))
		     (extra
		      (funcall (vc-client-object->file-to-extra vc-client-mode)
			       file))
		     (entry
		      (list file-short state extra)))
		  (vc-dir-update (list entry) status-buf))))))
	;; We didn't find any vc-dir buffers, remove the hook, it is
	;; not needed.
	(unless found-vc-dir-buf (remove-hook 'after-save-hook 'vc-directory-resynch-file))))))

(defun vc-dir-mode (client-object)
  "Major mode for showing the VC status for a directory.
Marking/Unmarking key bindings and actions:
m - marks a file/directory or if the region is active, mark all the files
     in region.
    Restrictions: - a file cannot be marked if any parent directory is marked
                  - a directory cannot be marked if any child file or
                    directory is marked
u - marks a file/directory or if the region is active, unmark all the files
     in region.
M - if the cursor is on a file: mark all the files with the same VC state as
      the current file
  - if the cursor is on a directory: mark all child files
  - with a prefix argument: mark all files
U - if the cursor is on a file: unmark all the files with the same VC state
      as the current file
  - if the cursor is on a directory: unmark all child files
  - with a prefix argument: unmark all files


\\{vc-dir-mode-map}"
  (setq mode-name (vc-client-object->name client-object))
  (setq major-mode 'vc-dir-mode)
  (setq buffer-read-only t)
  (use-local-map vc-dir-mode-map)
  (set (make-local-variable 'tool-bar-map) vc-dir-tool-bar-map)
  (set (make-local-variable 'vc-client-mode) client-object)
  (let ((buffer-read-only nil))
    (erase-buffer)
    (set (make-local-variable 'vc-dir-process-buffer) nil)
    (set (make-local-variable 'vc-ewoc)
	 (ewoc-create (vc-client-object->file-to-info client-object)
		      (vc-client-object->headers client-object)))
    (add-hook 'after-save-hook 'vc-directory-resynch-file)
    ;; Make sure that if the VC status buffer is killed, the update
    ;; process running in the background is also killed.
    (add-hook 'kill-buffer-query-functions 'vc-dir-kill-query nil t)
    (funcall (vc-client-object->updater client-object)))
  (run-hooks 'vc-dir-mode-hook))

(put 'vc-dir-mode 'mode-class 'special)

(defun vc-buffer-sync (&optional not-urgent)
  "Make sure the current buffer and its working file are in sync.
NOT-URGENT means it is ok to continue if the user says not to save."
  (when (buffer-modified-p)
    (if (or vc-suppress-confirm
	    (y-or-n-p (format "Buffer %s modified; save it? " (buffer-name))))
	(save-buffer)
      (unless not-urgent
	(error "Aborted")))))

(defun vc-dispatcher-browsing ()
  "Are we in a directory browser buffer?"
  (derived-mode-p 'vc-dir-mode))

(defun vc-dispatcher-in-fileset-p (fileset)
  (let ((member nil))
    (while (and (not member) fileset)
      (let ((elem (pop fileset)))
        (if (if (file-directory-p elem)
                (eq t (compare-strings buffer-file-name nil (length elem)
                                       elem nil nil))
              (eq (current-buffer) (get-file-buffer elem)))
            (setq member t))))
    member))

(defun vc-dispatcher-selection-set ()
  "Deduce a set of files to which to apply an operation.  Return the fileset.
If we're in a directory display, the fileset is the list of marked files (if
there is one) else the file on the curreent line.  If not in a directory
display, but the current buffer visits a file, the fileset is a singleton
containing that file.  Otherwise, throw an error."
  (let ((files
         (cond
          ;; Browsing with vc-dir
          ((vc-dispatcher-browsing)
           (or (vc-dir-marked-files) (list (vc-dir-current-file))))
          ;; Visiting an eligible file
          ((buffer-file-name)
           (list buffer-file-name))
          ;; No eligible file -- if there's a parent buffer, deduce from there
          ((and vc-parent-buffer (or (buffer-file-name vc-parent-buffer)
                                     (with-current-buffer vc-parent-buffer
                                       (vc-dispatcher-browsing))))
           (with-current-buffer vc-parent-buffer
             (vc-dispatcher-selection-set)))
          ;; No good set here, throw error
          (t (error "No fileset is available here")))))
    ;; We assume, in order to avoid unpleasant surprises to the user,
    ;; that a fileset is not in good shape to be handed to the user if the
    ;; buffers visiting the fileset don't match the on-disk contents.
    ;; This is actually untrue for operations like `print-log' (or `diff'
    ;; between two revisions), so maybe this should be moved elsewhere.
    (save-some-buffers
     nil (lambda () (vc-dispatcher-in-fileset-p files)))
    files))

;; arch-tag: 7d08b17f-5470-4799-914b-bfb9fcf6a246
;;; vc-dispatcher.el ends here