unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob 4a64caa36b8205ade483d644d157d11b0596111c 61624 bytes (raw)
name: lisp/vc/vc-hg.el 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
 
;;; vc-hg.el --- VC backend for the mercurial version control system  -*- lexical-binding: t -*-

;; Copyright (C) 2006-2021 Free Software Foundation, Inc.

;; Author: Ivan Kanis
;; Maintainer: emacs-devel@gnu.org
;; Keywords: vc tools
;; Package: vc

;; This file is part of GNU Emacs.

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

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

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

;;; Commentary:

;; This is a mercurial version control backend

;;; Todo:

;; 1) Implement the rest of the vc interface. See the comment at the
;; beginning of vc.el. The current status is:

;; FUNCTION NAME                               STATUS
;; BACKEND PROPERTIES
;; * revision-granularity                      OK
;; - update-on-retrieve-tag                    OK
;; STATE-QUERYING FUNCTIONS
;; * registered (file)                         OK
;; * state (file)                              OK
;; - dir-status-files (dir files uf)           OK
;; - dir-extra-headers (dir)                   OK
;; - dir-printer (fileinfo)                    OK
;; * working-revision (file)                   OK
;; * checkout-model (files)                    OK
;; - mode-line-string (file)                   OK
;; STATE-CHANGING FUNCTIONS
;; * register (files &optional rev comment)    OK
;; * create-repo ()                            OK
;; - responsible-p (file)                      OK
;; - receive-file (file rev)                   ?? PROBABLY NOT NEEDED
;; - unregister (file)                         OK
;; * checkin (files rev comment)               OK
;; * find-revision (file rev buffer)           OK
;; * checkout (file &optional rev)             OK
;; * revert (file &optional contents-done)     OK
;; - merge (file rev1 rev2)                    NEEDED
;; - merge-news (file)                         NEEDED
;; - steal-lock (file &optional revision)      NOT NEEDED
;; HISTORY FUNCTIONS
;; * print-log (files buffer &optional shortlog start-revision limit) OK
;; - log-view-mode ()                          OK
;; - show-log-entry (revision)                 NOT NEEDED, DEFAULT IS GOOD
;; - comment-history (file)                    NOT NEEDED
;; - update-changelog (files)                  NOT NEEDED
;; * diff (files &optional rev1 rev2 buffer)   OK
;; - revision-completion-table (files)         OK?
;; - annotate-command (file buf &optional rev) OK
;; - annotate-time ()                          OK
;; - annotate-current-time ()                  NOT NEEDED
;; - annotate-extract-revision-at-line ()      OK
;; TAG SYSTEM
;; - create-tag (dir name branchp)             OK
;; - retrieve-tag (dir name update)            OK
;; MISCELLANEOUS
;; - make-version-backups-p (file)             ??
;; - previous-revision (file rev)              OK
;; - next-revision (file rev)                  OK
;; - check-headers ()                          ??
;; - delete-file (file)                        TEST IT
;; - rename-file (old new)                     OK
;; - find-file-hook ()                         added for bug#10709

;; 2) Implement Stefan Monnier's advice:
;; vc-hg-registered and vc-hg-state
;; Both of those functions should be super extra careful to fail gracefully in
;; unexpected circumstances. The reason this is important is that any error
;; there will prevent the user from even looking at the file :-(
;; Ideally, just like in vc-arch and vc-cvs, checking that the file is under
;; mercurial's control and extracting the current revision should be done
;; without even using `hg' (this way even if you don't have `hg' installed,
;; Emacs is able to tell you this file is under mercurial's control).

;;; Code:

(require 'cl-lib)

(eval-when-compile
  (require 'vc)
  (require 'vc-dir))

(declare-function vc-compilation-mode "vc-dispatcher" (backend))
(declare-function vc-read-revision "vc"
                  (prompt &optional files backend default initial-input))

;;; Customization options

(defgroup vc-hg nil
  "VC Mercurial (hg) backend."
  :version "24.1"
  :group 'vc)

(defcustom vc-hg-global-switches nil
  "Global switches to pass to any Hg command."
  :type '(choice (const :tag "None" nil)
         (string :tag "Argument String")
         (repeat :tag "Argument List" :value ("") string))
  :version "22.2")

(defcustom vc-hg-diff-switches t ; Hg doesn't support common args like -u
  "String or list of strings specifying switches for Hg diff under VC.
If nil, use the value of `vc-diff-switches'.  If t, use no switches."
  :type '(choice (const :tag "Unspecified" nil)
                 (const :tag "None" t)
                 (string :tag "Argument String")
                 (repeat :tag "Argument List" :value ("") string))
  :version "23.1")

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

(defcustom vc-hg-revert-switches nil
  "String or list of strings specifying switches for hg revert
under VC."
  :type '(choice (const :tag "None" nil)
		 (string :tag "Argument String")
		 (repeat :tag "Argument List" :value ("") string))
  :version "27.1")

(defcustom vc-hg-program "hg"
  "Name of the Mercurial executable (excluding any arguments)."
  :type 'string)

(defcustom vc-hg-root-log-format
  `(,(concat "{rev}:{ifeq(branch, 'default','', '{branch}')}"
             ":{bookmarks}:{tags}:{author|person}"
             " {date|shortdate} {desc|firstline}\\n")
    ,(concat "^\\(?:[+@o x|-]*\\)"      ;Graph data.
             "\\([0-9]+\\):\\([^:]*\\)"
             ":\\([^:]*\\):\\([^:]*\\):\\(.*?\\)"
             "[ \t]+\\([0-9]\\{4\\}-[0-9]\\{2\\}-[0-9]\\{2\\}\\)")
    ((1 'log-view-message)
     (2 'change-log-file)
     (3 'change-log-list)
     (4 'change-log-conditionals)
     (5 'change-log-name)
     (6 'change-log-date)))
  "Mercurial log template for `vc-hg-print-log' short format.
This should be a list (TEMPLATE REGEXP KEYWORDS), where TEMPLATE
is the \"--template\" argument string to pass to Mercurial,
REGEXP is a regular expression matching the resulting Mercurial
output, and KEYWORDS is a list of `font-lock-keywords' for
highlighting the Log View buffer."
  :type '(list string regexp (repeat sexp))
  :version "24.5")

(defcustom vc-hg-create-bookmark t
  "This controls whether `vc-create-tag' will create a bookmark or branch.
If nil, named branch will be created.
If t, bookmark will be created.
If `ask', you will be prompted for a branch type."
  :type '(choice (const :tag "No" nil)
                 (const :tag "Yes" t)
                 (const :tag "Ask" ask))
  :version "28.1")

\f
;; Clear up the cache to force vc-call to check again and discover
;; new functions when we reload this file.
(put 'Hg 'vc-functions nil)

;;; Properties of the backend

(defvar vc-hg-history nil)

(defun vc-hg-revision-granularity () 'repository)
(defun vc-hg-checkout-model (_files) 'implicit)
(defun vc-hg-update-on-retrieve-tag () nil)

;;; State querying functions

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

;; Modeled after the similar function in vc-bzr.el
(defun vc-hg-registered (file)
  "Return non-nil if FILE is registered with hg."
  (when (vc-hg-root file)           ; short cut
    (let ((state (vc-state file 'Hg)))  ; expensive
      (if (memq state '(ignored unregistered nil))
          ;; Clear the cache for proper fallback to another backend.
          (ignore (vc-file-setprop file 'vc-state nil))
        t))))

(defun vc-hg-state (file)
  "Hg-specific version of `vc-state'."
  (let ((state (vc-hg-state-fast file)))
    (if (eq state 'unsupported) (vc-hg-state-slow file) state)))

(defun vc-hg-state-slow (file)
  "Determine status of FILE by running hg."
  (setq file (expand-file-name file))
  (let*
      ((status nil)
       (default-directory (file-name-directory file))
       (out
        (with-output-to-string
          (with-current-buffer
              standard-output
            (setq status
                  (condition-case nil
                      ;; Ignore all errors.
		      (let ((process-environment
			     ;; Avoid localization of messages so we
			     ;; can parse the output.  Disable pager.
			     (append
			      (list "TERM=dumb" "LANGUAGE=C" "HGPLAIN=1")
			      process-environment)))
			(process-file
			 vc-hg-program nil t nil
                         "--config" "ui.report_untrusted=0"
			 "--config" "alias.status=status"
			 "--config" "defaults.status="
			 "status" "-A" (file-relative-name file)))
                    ;; Some problem happened.  E.g. We can't find an `hg'
                    ;; executable.
                    (error nil)))))))
    (when (and (eq 0 status)
	       (> (length out) 0)
	       (null (string-match ".*: No such file or directory$" out)))
      (let ((state (aref out 0)))
	(cond
	 ((eq state ?=) 'up-to-date)
	 ((eq state ?A) 'added)
	 ((eq state ?M) 'edited)
	 ((eq state ?I) 'ignored)
	 ((eq state ?R) 'removed)
	 ((eq state ?!) 'missing)
	 ((eq state ??) 'unregistered)
	 ((eq state ?C) 'up-to-date) ;; Older mercurial versions use this.
	 (t 'up-to-date))))))

(defun vc-hg-working-revision (_file)
  "Hg-specific version of `vc-working-revision'."
  (ignore-errors
    (with-output-to-string
      (vc-hg-command standard-output 0 nil
                     "log" "-r" "." "--template" "{rev}"))))

(defcustom vc-hg-symbolic-revision-styles
  '(builtin-active-bookmark
    "{if(bookmarks,sub(' ',',',bookmarks),if(phabdiff,phabdiff,shortest(node,6)))}")
  "List of ways to present versions symbolically.  The version
that we use is the first one that successfully produces a
non-empty string.

Each entry in the list can be either:

- The symbol `builtin-active-bookmark', which indicates that we
should use the active bookmark if one exists.  A template can
supply this information as well, but `builtin-active-bookmark' is
handled entirely inside Emacs and so is more efficient than using
the generic Mercurial mechanism.

- A string giving the Mercurial template to supply to \"hg
parent\".  \"hg help template\" may be useful reading.

- A function to call; it should accept two arguments (a revision
and an optional path to which to limit history) and produce a
string.  The function is called with `default-directory' set to
within the repository.

If no list entry produces a useful revision, return `nil'."
  :type '(repeat (choice
                  (const :tag "Active bookmark" builtin-active-bookmark)
                  (string :tag "Hg template")
                  (function :tag "Custom")))
  :version "26.1")

(defcustom vc-hg-use-file-version-for-mode-line-version nil
  "When enabled, the modeline contains revision information for the visited file.
When not, the revision in the modeline is for the repository
working copy.  `nil' is the much faster setting for
large repositories."
  :type 'boolean
  :version "26.1")

(defun vc-hg--active-bookmark-internal (rev)
  (when (equal rev ".")
    (let* ((current-bookmarks-file ".hg/bookmarks.current"))
      (when (file-exists-p current-bookmarks-file)
        (ignore-errors
          (with-temp-buffer
            (insert-file-contents current-bookmarks-file)
            (buffer-substring-no-properties
             (point-min) (point-max))))))))

(defun vc-hg--run-log (template rev path)
  (ignore-errors
    (with-output-to-string
      (if path
          (vc-hg-command
           standard-output 0 nil
           "log" "-f" "-l1" "--template" template path)
        (vc-hg-command
         standard-output 0 nil
         "log" "-r" rev "-l1" "--template" template)))))

(defun vc-hg--symbolic-revision (rev &optional path)
  "Make a Mercurial revision human-readable.
REV is a Mercurial revision.  `default-directory' is assumed to
be in the repository root of interest.  PATH, if set, is a
specific file to query."
  (let ((symbolic-revision nil)
        (styles vc-hg-symbolic-revision-styles))
    (while (and (not symbolic-revision) styles)
      (let ((style (pop styles)))
        (setf symbolic-revision
              (cond ((and (null path) (eq style 'builtin-active-bookmark))
                     (vc-hg--active-bookmark-internal rev))
                    ((stringp style)
                     (vc-hg--run-log style rev path))
                    ((functionp style)
                     (funcall style rev path))))))
    symbolic-revision))

(defun vc-hg-mode-line-string (file)
  "Hg-specific version of `vc-mode-line-string'."
  (let* ((backend-name "Hg")
         (truename (file-truename file))
         (state (vc-state truename))
         (state-echo nil)
         (face nil)
         (rev (and state
                   (let ((default-directory
                          (expand-file-name (vc-hg-root truename))))
                     (vc-hg--symbolic-revision
                      "."
                      (and vc-hg-use-file-version-for-mode-line-version
                           truename)))))
         (rev (or rev "???")))
    (propertize
     (cond ((or (eq state 'up-to-date)
                (eq state 'needs-update))
            (setq state-echo "Up to date file")
            (setq face 'vc-up-to-date-state)
            (concat backend-name "-" rev))
           ((eq state 'added)
            (setq state-echo "Locally added file")
            (setq face 'vc-locally-added-state)
            (concat backend-name "@" rev))
           ((eq state 'conflict)
            (setq state-echo "File contains conflicts after the last merge")
            (setq face 'vc-conflict-state)
            (concat backend-name "!" rev))
           ((eq state 'removed)
            (setq state-echo "File removed from the VC system")
            (setq face 'vc-removed-state)
            (concat backend-name "!" rev))
           ((eq state 'missing)
            (setq state-echo "File tracked by the VC system, but missing from the file system")
            (setq face 'vc-missing-state)
            (concat backend-name "?" rev))
           (t
            (setq state-echo "Locally modified file")
            (setq face 'vc-edited-state)
            (concat backend-name ":" rev)))
     'face face
     'help-echo (concat state-echo " under the " backend-name
                        " version control system"))))

;;; History functions

(defcustom vc-hg-log-switches nil
  "String or list of strings specifying switches for hg log under VC."
  :type '(choice (const :tag "None" nil)
                 (string :tag "Argument String")
                 (repeat :tag "Argument List" :value ("") string)))

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

(defvar vc-hg-log-graph nil
  "If non-nil, use `--graph' in the short log output.")

(defvar vc-hg-log-format (concat "changeset:   {rev}:{node|short}\n"
                                 "{tags % 'tag:         {tag}\n'}"
                                 "{if(parents, 'parents:     {parents}\n')}"
                                 "user:        {author}\n"
                                 "Date:        {date|date}\n"
                                 "summary:     {desc|tabindent}\n\n")
  "Mercurial log template for `vc-hg-print-log' long format.")

(defun vc-hg-print-log (files buffer &optional shortlog start-revision limit)
  "Print commit log associated with FILES into specified BUFFER.
If SHORTLOG is non-nil, use a short format based on `vc-hg-root-log-format'.
If START-REVISION is non-nil, it is the newest revision to show.
If LIMIT is non-nil, show no more than this many entries."
  ;; `vc-do-command' creates the buffer, but we need it before running
  ;; the command.
  (vc-setup-buffer buffer)
  ;; If the buffer exists from a previous invocation it might be
  ;; read-only.
  (let ((inhibit-read-only t))
    (with-current-buffer
	buffer
      (apply #'vc-hg-command buffer 'async files "log"
	     (nconc
	      (when start-revision (list (format "-r%s:0" start-revision)))
	      (when limit (list "-l" (format "%s" limit)))
              (when (eq vc-log-view-type 'with-diff)
                (list "-p"))
	      (if shortlog
                  `(,@(if vc-hg-log-graph '("--graph"))
                    "--template"
                    ,(car vc-hg-root-log-format))
                `("--template" ,vc-hg-log-format))
	      vc-hg-log-switches)))))

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

(define-derived-mode vc-hg-log-view-mode log-view-mode "Hg-Log-View"
  (require 'add-log) ;; we need the add-log faces
  (setq-local log-view-file-re regexp-unmatchable)
  (setq-local log-view-per-file-logs nil)
  (setq-local log-view-message-re
              (if (eq vc-log-view-type 'short)
                  (cadr vc-hg-root-log-format)
                "^changeset:[ \t]*\\([0-9]+\\):\\(.+\\)"))
  (setq-local tab-width 2)
  ;; Allow expanding short log entries
  (when (eq vc-log-view-type 'short)
    (setq truncate-lines t)
    (setq-local log-view-expanded-log-entry-function
                'vc-hg-expanded-log-entry))
  (setq-local log-view-font-lock-keywords
       (if (eq vc-log-view-type 'short)
	   (list (cons (nth 1 vc-hg-root-log-format)
		       (nth 2 vc-hg-root-log-format)))
	 (append
	  log-view-font-lock-keywords
	  '(
	    ;; Handle the case:
	    ;; user: FirstName LastName <foo@bar>
	    ("^user:[ \t]+\\([^<(]+?\\)[ \t]*[(<]\\([A-Za-z0-9_.+-]+@[A-Za-z0-9_.-]+\\)[>)]"
	     (1 'change-log-name)
	     (2 'change-log-email))
	    ;; Handle the cases:
	    ;; user: foo@bar
	    ;; and
	    ;; user: foo
	    ("^user:[ \t]+\\([A-Za-z0-9_.+-]+\\(?:@[A-Za-z0-9_.-]+\\)?\\)"
	     (1 'change-log-email))
	    ("^date: \\(.+\\)" (1 'change-log-date))
	    ("^tag: +\\([^ ]+\\)$" (1 'highlight))
	    ("^summary:[ \t]+\\(.+\\)" (1 'log-view-message)))))))

(autoload 'vc-switches "vc")

(defun vc-hg-region-history (file buffer lfrom lto)
  "Insert into BUFFER the history of FILE for lines LFROM to LTO.
This requires hg 4.4 or later, for the \"-L\" option of \"hg log\"."
  (vc-hg-command buffer 'async nil "log" "-f" "-p" "-L"
                  (format "%s,%d:%d" (file-relative-name file) lfrom lto)))

(require 'diff-mode)

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

(defvar vc-hg--log-view-long-font-lock-keywords nil)
(defvar font-lock-keywords)
(defvar vc-hg-region-history-font-lock-keywords
  '((vc-hg-region-history-font-lock)))

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

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

(defun vc-hg-diff (files &optional oldvers newvers buffer _async)
  "Get a difference report using hg between two revisions of FILES."
  (let* ((firstfile (car files))
         (working (and firstfile (vc-working-revision firstfile))))
    (when (and (equal oldvers working) (not newvers))
      (setq oldvers nil))
    (when (and (not oldvers) newvers)
      (setq oldvers working))
    (apply #'vc-hg-command
	   (or buffer "*vc-diff*")
           nil ; bug#21969
           files "diff"
           (append
            (vc-switches 'hg 'diff)
            (when oldvers
              (if newvers
                  (list "-r" oldvers "-r" newvers)
                (list "-r" oldvers)))))))

(defun vc-hg-expanded-log-entry (revision)
  (with-temp-buffer
    (vc-hg-command t nil nil "log" "-r" revision "--template" vc-hg-log-format)
    (goto-char (point-min))
    (unless (eobp)
      ;; Indent the expanded log entry.
      (indent-region (point-min) (point-max) 2)
      (goto-char (point-max))
      (buffer-string))))

(defun vc-hg-revision-table (files)
  (let ((default-directory (file-name-directory (car files))))
    (with-temp-buffer
      (vc-hg-command t nil nil "branches" "-q")
      (vc-hg-command t nil nil "bookmarks" "-q")
      (vc-hg-command t nil nil "tags" "-q")
      (split-string
       (buffer-substring-no-properties (point-min) (point-max))))))

;; Modeled after the similar function in vc-cvs.el
(defun vc-hg-revision-completion-table (files)
  (letrec ((table (lazy-completion-table
                   table (lambda () (vc-hg-revision-table files)))))
    table))

(defun vc-hg-annotate-command (file buffer &optional revision)
  "Execute \"hg annotate\" on FILE, inserting the contents in BUFFER.
Optional arg REVISION is a revision to annotate from."
  (apply #'vc-hg-command buffer 0 file "annotate" "-dq" "-n"
	 (append (vc-switches 'hg 'annotate)
                 (if revision (list (concat "-r" revision))))))

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

;; One line printed by "hg annotate -dq -n -u --follow" looks like this:
;;   b56girard 114590 2012-03-13 CLOBBER: Lorem ipsum dolor sit
;; i.e. AUTHOR REVISION DATE FILENAME: CONTENTS
;; The user can omit options "-u" and/or "--follow".  Then it'll look like:
;;   114590 2012-03-13 CLOBBER:
;; or
;;   b56girard 114590 2012-03-13:
(defconst vc-hg-annotate-re
  (concat
   "^\\(?: *[^ ]+ +\\)?\\([0-9]+\\) "   ;User and revision.
   "\\([0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]\\)" ;Date.
   "\\(?: +\\([^:]+\\)\\)?:"))                        ;Filename.

(defun vc-hg-annotate-time ()
  (when (looking-at vc-hg-annotate-re)
    (goto-char (match-end 0))
    (vc-annotate-convert-time
     (let ((str (match-string-no-properties 2)))
       (encode-time 0 0 0
                    (string-to-number (substring str 6 8))
                    (string-to-number (substring str 4 6))
                    (string-to-number (substring str 0 4)))))))

(defun vc-hg-annotate-extract-revision-at-line ()
  (save-excursion
    (beginning-of-line)
    (when (looking-at vc-hg-annotate-re)
      (if (match-beginning 3)
          (cons (match-string-no-properties 1)
                (expand-file-name (match-string-no-properties 3)
                                  (vc-hg-root default-directory)))
        (match-string-no-properties 1)))))

;;; Tag system

(defun vc-hg-create-tag (dir name branchp)
  "Create tag NAME in repo in DIR.  Create branch if BRANCHP.
Variable `vc-hg-create-bookmark' controls what kind of branch will be created."
  (let ((default-directory dir))
    (vc-hg-command nil 0 nil
                   (if branchp
                       (if (if (eq vc-hg-create-bookmark 'ask)
                               (yes-or-no-p "Create bookmark instead of branch? ")
                             vc-hg-create-bookmark)
                           "bookmark"
                         "branch")
                     "tag")
                   name)))

(defun vc-hg-retrieve-tag (dir name _update)
  "Retrieve the version tagged by NAME of all registered files at or below DIR."
  (let ((default-directory dir))
    (vc-hg-command nil 0 nil "update" (and (not (equal name ""))
                                           name))
    ;; TODO: update *vc-change-log* buffer so can see @ if --graph
    ))

;;; Native data structure reading

(defcustom vc-hg-parse-hg-data-structures t
  "If true, try directly parsing Mercurial data structures
directly instead of always running Mercurial.  We try to be safe
against Mercurial data structure format changes and always fall
back to running Mercurial directly."
  :type 'boolean
  :version "26.1")

(defsubst vc-hg--read-u8 ()
  "Read and advance over an unsigned byte.
Return the byte's value as an integer."
  (prog1 (char-after)
    (forward-char)))

(defsubst vc-hg--read-u32-be ()
  "Read and advance over a big-endian unsigned 32-bit integer."
  ;; Because elisp bytecode has an instruction for multiply and
  ;; doesn't have one for shift, it's somewhat counter-intuitively
  ;; faster to multiply than to shift.
  (+ (* (vc-hg--read-u8) (* 256 256 256))
     (* (vc-hg--read-u8) (* 256 256))
     (* (vc-hg--read-u8) 256)
     (identity (vc-hg--read-u8))))

(defun vc-hg--raw-dirstate-search (dirstate fname)
  (with-temp-buffer
    (set-buffer-multibyte nil)
    (insert-file-contents-literally dirstate)
    (let* ((result nil)
           (flen (length fname))
           (case-fold-search nil)
           (inhibit-changing-match-data t)
           ;; Find a conservative bound for the loop below by using
           ;; Boyer-Moore on the raw dirstate without parsing it; we
           ;; know we can't possibly find fname _after_ the last place
           ;; it appears, so we can bail out early if we try to parse
           ;; past it, which especially helps when the file we're
           ;; trying to find isn't in dirstate at all.  There's no way
           ;; to similarly bound the starting search position, since
           ;; the file format is such that we need to parse it from
           ;; the beginning to find record boundaries.
           (search-limit
            (progn
              (goto-char (point-max))
              (or (search-backward fname (+ (point-min) 40) t)
                  (point-min)))))
      ;; 40 is just after the header, which contains the working
      ;; directory parents
      (goto-char (+ (point-min) 40))
      ;; Iterate over all dirstate entries; we might run this loop
      ;; hundreds of thousands of times, so performance is important
      ;; here
      (while (< (point) search-limit)
        ;; 1+4*4 is the length of the dirstate item header.
        (forward-char (1+ (* 3 4)))
        (let ((this-flen (vc-hg--read-u32-be)))
          (if (and (or (eq this-flen flen)
                       (and (> this-flen flen)
                            (eq (char-after (+ (point) flen)) 0)))
                   (search-forward fname (+ (point) flen) t))
              (progn
                (backward-char (+ flen (1+ (* 4 4))))
                (setf result
                      (list (vc-hg--read-u8)     ; status
                            (vc-hg--read-u32-be) ; mode
                            (vc-hg--read-u32-be) ; size (of file)
                            (vc-hg--read-u32-be) ; mtime
                            ))
                (goto-char (point-max)))
            (forward-char this-flen))))
      result)))

(define-error 'vc-hg-unsupported-syntax "unsupported hgignore syntax")

(defconst vc-hg--pcre-c-escapes
  '((?a . ?\a)
    (?b . ?\b)
    (?f . ?\f)
    (?n . ?\n)
    (?r . ?\r)
    (?t . ?\t)
    (?n . ?\n)
    (?r . ?\r)
    (?t . ?\t)
    (?v . ?\v)))

(defconst vc-hg--pcre-metacharacters
  '(?. ?^ ?$ ?* ?+ ?? ?{ ?\\ ?\[ ?\| ?\())

(defconst vc-hg--elisp-metacharacters
  '(?. ?* ?+ ?? ?\[ ?$ ?\\))

(defun vc-hg--escape-for-pcre (c)
  (if (memq c vc-hg--pcre-metacharacters)
      (string ?\\ c)
    c))

(defun vc-hg--parts-to-string (parts)
  "Build a string from list PARTS.  Each element is a character or string."
  (let ((parts2 nil))
    (while parts
      (let* ((partcell (prog1 parts (setf parts (cdr parts))))
             (part (car partcell)))
        (if (stringp part)
            (setf parts2 (nconc (append part nil) parts2))
          (setcdr partcell parts2)
          (setf parts2 partcell))))
    (apply #'string parts2)))

(defun vc-hg--pcre-to-elisp-re (pcre prefix)
  "Transform PCRE, a Mercurial file PCRE, into an elisp RE against PREFIX.
PREFIX is the directory name of the directory against which these
patterns are rooted.  We understand only a subset of PCRE syntax;
if we don't understand a construct, we signal
`vc-hg-unsupported-syntax'."
  (cl-assert (and (file-name-absolute-p prefix)
                  (directory-name-p prefix)))
  (let ((parts nil)
        (i 0)
        (anchored nil)
        (state 'normal)
        (pcrelen (length pcre)))
    (while (< i pcrelen)
      (let ((c (aref pcre i)))
        (cond ((eq state 'normal)
               (cond ((string-match
                       (rx (| "}\\?" (: "(?" (not (any ":")))))
                       pcre i)
                      (signal 'vc-hg-unsupported-syntax (list pcre)))
                     ((eq c ?\\)
                      (setf state 'backslash))
                     ((eq c ?\[)
                      (setf state 'charclass-enter)
                      (push c parts))
                     ((eq c ?^)
                      (if (eq i 0) (setf anchored t)
                        (signal 'vc-hg-unsupported-syntax (list pcre))))
                     ((eq c ?$)
                      ;; Patterns can also match directories exactly,
                      ;; ignoring everything under a matched directory
                      (push "\\(?:$\\|/\\)" parts))
                     ((memq c '(?| ?\( ?\)))
                      (push ?\\ parts)
                      (push c parts))
                     (t (push c parts))))
              ((eq state 'backslash)
               (cond ((memq c '(?0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9
                                ?A ?b ?B ?d ?D ?s ?S ?w ?W ?Z ?x))
                      (signal 'vc-hg-unsupported-syntax (list pcre)))
                     ((memq c vc-hg--elisp-metacharacters)
                      (push ?\\ parts)
                      (push c parts))
                     (t (push (or (cdr (assq c vc-hg--pcre-c-escapes)) c) parts)))
               (setf state 'normal))
              ((eq state 'charclass-enter)
               (push c parts)
               (setf state
                     (if (eq c ?\\)
                         'charclass
                       'charclass-backslash)))
              ((eq state 'charclass-backslash)
               (if (memq c '(?0 ?x))
                   (signal 'vc-hg-unsupported-syntax (list pcre)))
               (push (or (cdr (assq c vc-hg--pcre-c-escapes)) c) parts)
               (setf state 'charclass))
              ((eq state 'charclass)
               (push c parts)
               (cond ((eq c ?\\) (setf state 'charclass-backslash))
                     ((eq c ?\]) (setf state 'normal))))
              (t (error "invalid state")))
        (setf i (1+ i))))
    (unless (eq state 'normal)
      (signal 'vc-hg-unsupported-syntax (list pcre)))
    (concat
     "^"
     prefix
     (if anchored "" "\\(?:.*/\\)?")
     (vc-hg--parts-to-string parts))))

(defun vc-hg--glob-to-pcre (glob)
  "Transform a glob pattern into a Mercurial file pattern regex."
  (let ((parts nil) (i 0) (n (length glob)) (group 0) c)
    (cl-macrolet ((peek () '(and (< i n) (aref glob i))))
      (while (< i n)
        (setf c (aref glob i))
        (cl-incf i)
        (cond ((not (memq c '(?* ?? ?\[ ?\{ ?\} ?, ?\\)))
               (push (vc-hg--escape-for-pcre c) parts))
              ((eq c ?*)
               (cond ((eq (peek) ?*)
                      (cl-incf i)
                      (cond ((eq (peek) ?/)
                             (cl-incf i)
                             (push "(?:.*/)?" parts))
                            (t
                             (push ".*" parts))))
                     (t (push "[^/]*" parts))))
              ((eq c ??)
               (push ?. parts))
              ((eq c ?\[)
               (let ((j i))
                 (when (and (< j n) (memq (aref glob j) '(?! ?\])))
                   (cl-incf j))
                 (while (and (< j n) (not (eq (aref glob j) ?\])))
                   (cl-incf j))
                 (cond ((>= j n)
                        (push "\\[" parts))
                       (t
                        (let ((x (substring glob i j)))
                          (setf x (string-replace
                                   "\\" "\\\\" x))
                          (setf i (1+ j))
                          (cond ((eq (aref x 0) ?!)
                                 (setf (aref x 0) ?^))
                                ((eq (aref x 0) ?^)
                                 (setf x (concat "\\" x))))
                          (push ?\[ parts)
                          (push x parts)
                          (push ?\] parts))))))
              ((eq c ?\{)
               (cl-incf group)
               (push "(?:" parts))
              ((eq c ?\})
               (push ?\) parts)
               (cl-decf group))
              ((and (eq c ?,) (> group 0))
               (push ?| parts))
              ((eq c ?\\)
               (if (eq i n)
                   (push "\\\\" parts)
                 (cl-incf i)
                 (push ?\\ parts)
                 (push c parts)))
              (t
               (push (vc-hg--escape-for-pcre c) parts)))))
    (concat (vc-hg--parts-to-string parts) "$")))

(defvar vc-hg--hgignore-patterns)
(defvar vc-hg--hgignore-filenames)

(defun vc-hg--hgignore-add-pcre (pcre prefix)
  (push (vc-hg--pcre-to-elisp-re pcre prefix) vc-hg--hgignore-patterns))

(defun vc-hg--hgignore-add-glob (glob prefix)
  (push (vc-hg--pcre-to-elisp-re (vc-hg--glob-to-pcre glob) prefix)
        vc-hg--hgignore-patterns))

(defun vc-hg--hgignore-add-path (path prefix)
  (let ((parts nil))
    (dotimes (i (length path))
      (push (vc-hg--escape-for-pcre (aref path i)) parts))
    (vc-hg--hgignore-add-pcre
     (concat "^" (vc-hg--parts-to-string parts) "$")
     prefix)))

(defun vc-hg--slurp-hgignore-1 (hgignore prefix)
  (let ((default-syntax 'vc-hg--hgignore-add-pcre))
    (with-temp-buffer
      (let ((attr (file-attributes hgignore)))
        (when attr (insert-file-contents hgignore))
        (push (list hgignore (file-attribute-modification-time attr) (file-attribute-size attr))
              vc-hg--hgignore-filenames))
      (while (not (eobp))
        ;; This list of pattern-file commands isn't complete, but it
        ;; should cover the common cases.  Remember that we fall back
        ;; to regular hg commands if we see something we don't like.
        (save-restriction
          (narrow-to-region (point) (point-at-eol))
          (cond ((looking-at "[ \t]*\\(?:#.*\\)?$"))
                ((looking-at "syntax:[ \t]*re[ \t]*$")
                 (setf default-syntax 'vc-hg--hgignore-add-pcre))
                ((looking-at "syntax:[ \t]*glob[ \t]*$")
                 (setf default-syntax 'vc-hg--hgignore-add-glob))
                ((looking-at "path:\\(.+?\\)[ \t]*$")
                 (vc-hg--hgignore-add-path (match-string 1) prefix))
                ((looking-at "glob:\\(.+?\\)[ \t]*$")
                 (vc-hg--hgignore-add-glob (match-string 1) prefix))
                ((looking-at "re:\\(.+?\\)[ \t]*$")
                 (vc-hg--hgignore-add-pcre (match-string 1) prefix))
                ((looking-at "\\(sub\\)?include:\\(.+?\\)[ \t]*$")
                 (let* ((sub (equal (match-string 1) "sub"))
                        (arg (match-string 2))
                        (included-file
                         (if (string-match "^/" arg) arg
                           (concat (file-name-directory hgignore) arg))))
                   (vc-hg--slurp-hgignore-1
                    included-file
                    (if sub (file-name-directory included-file) prefix))))
                ((looking-at "[a-zA-Z0-9_]*:")
                 (signal 'vc-hg-unsupported-syntax (list (match-string 0))))
                ((looking-at ".*$")
                 (funcall default-syntax (match-string 0) prefix))))
        (forward-line 1)))))

(cl-defstruct (vc-hg--ignore-patterns
                (:copier nil)
                (:constructor vc-hg--ignore-patterns-make))
  repo
  ignore-patterns
  file-sources)

(defun vc-hg--slurp-hgignore (repo)
  "Read hg ignore patterns from REPO.
REPO must be the directory name of an hg repository."
  (cl-assert (and (file-name-absolute-p repo)
                  (directory-name-p repo)))
  (let* ((hgignore (concat repo ".hgignore"))
         (vc-hg--hgignore-patterns nil)
         (vc-hg--hgignore-filenames nil))
    (vc-hg--slurp-hgignore-1 hgignore repo)
    (vc-hg--ignore-patterns-make
     :repo repo
     :ignore-patterns (nreverse vc-hg--hgignore-patterns)
     :file-sources (nreverse vc-hg--hgignore-filenames))))

(defun vc-hg--ignore-patterns-valid-p (hgip)
  "Return whether the cached ignore patterns in HGIP are still valid."
  (let ((valid t)
        (file-sources (vc-hg--ignore-patterns-file-sources hgip)))
    (while (and file-sources valid)
      (let* ((fs (pop file-sources))
             (saved-mtime (nth 1 fs))
             (saved-size (nth 2 fs))
             (attr (file-attributes (nth 0 fs)))
             (current-mtime (file-attribute-modification-time attr))
             (current-size (file-attribute-size attr)))
        (unless (and (equal saved-mtime current-mtime)
                     (equal saved-size current-size))
          (setf valid nil))))
    valid))

(defun vc-hg--ignore-patterns-ignored-p (hgip filename)
  "Test whether the ignore pattern set HGIP says to ignore FILENAME.
FILENAME must be the file's true absolute name."
  (let ((patterns (vc-hg--ignore-patterns-ignore-patterns hgip))
        (inhibit-changing-match-data t)
        (ignored nil))
    (while (and patterns (not ignored))
      (setf ignored (string-match (pop patterns) filename)))
    ignored))

(defvar vc-hg--cached-ignore-patterns nil
  "Cached pre-parsed hg ignore patterns.")

(defun vc-hg--file-ignored-p (repo repo-relative-filename)
  (let ((hgip vc-hg--cached-ignore-patterns))
    (unless (and hgip
                 (equal repo (vc-hg--ignore-patterns-repo hgip))
                 (vc-hg--ignore-patterns-valid-p hgip))
      (setf vc-hg--cached-ignore-patterns nil)
      (setf hgip (vc-hg--slurp-hgignore repo))
      (setf vc-hg--cached-ignore-patterns hgip))
    (vc-hg--ignore-patterns-ignored-p
     hgip
     (concat repo repo-relative-filename))))

(defun vc-hg--read-repo-requirements (repo)
  (cl-assert (and (file-name-absolute-p repo)
                  (directory-name-p repo)))
  (let* ((requires-filename (concat repo ".hg/requires")))
    (and (file-exists-p requires-filename)
         (with-temp-buffer
           (set-buffer-multibyte nil)
           (insert-file-contents-literally requires-filename)
           (split-string (buffer-substring-no-properties
                          (point-min) (point-max)))))))

(defconst vc-hg-supported-requirements
  '("dotencode"
    "fncache"
    "generaldelta"
    "lz4revlog"
    "remotefilelog"
    "revlogv1"
    "store")
  "List of Mercurial repository requirements we understand; if a
repository requires features not present in this list, we avoid
attempting to parse Mercurial data structures.")

(defun vc-hg--requirements-understood-p (repo)
  "Check that we understand the format of the given repository.
REPO is the directory name of a Mercurial repository."
  (null (cl-set-difference (vc-hg--read-repo-requirements repo)
                           vc-hg-supported-requirements
                           :test #'equal)))

(defvar vc-hg--dirstate-scan-cache nil
  "Cache of the last result of `vc-hg--raw-dirstate-search'.
Avoids the need to repeatedly scan dirstate on repeated calls to
`vc-hg-state', as we see during registration queries.")

(defun vc-hg--cached-dirstate-search (dirstate dirstate-attr ascii-fname)
  (let* ((mtime (file-attribute-modification-time dirstate-attr))
         (size (file-attribute-size dirstate-attr))
         (cache vc-hg--dirstate-scan-cache)
         )
    (if (and cache
             (equal dirstate (pop cache))
             (equal mtime (pop cache))
             (equal size (pop cache))
             (equal ascii-fname (pop cache)))
        (pop cache)
      (let ((result (vc-hg--raw-dirstate-search dirstate ascii-fname)))
        (setf vc-hg--dirstate-scan-cache
              (list dirstate mtime size ascii-fname result))
        result))))

(defun vc-hg-state-fast (filename)
  "Like `vc-hg-state', but parse internal data structures directly.
Returns one of the usual `vc-state' enumeration values or
`unsupported' if we need to take the slow path and run the
hg binary."
  (let* (truename
         repo
         dirstate
         dirstate-attr
         repo-relative-filename)
    (if (or
         ;; Explicit user disable
         (not vc-hg-parse-hg-data-structures)
         ;; It'll probably be faster to run hg remotely
         (file-remote-p filename)
         (progn
           (setf truename (file-truename filename))
           (file-remote-p truename))
         (not (setf repo (vc-hg-root truename)))
         ;; dirstate must exist
         (not (progn
                (setf repo (expand-file-name repo))
                (cl-assert (and (file-name-absolute-p repo)
                                (directory-name-p repo)))
                (setf dirstate (concat repo ".hg/dirstate"))
                (setf dirstate-attr (file-attributes dirstate))))
         ;; Repository must be in an understood format
         (not (vc-hg--requirements-understood-p repo))
         ;; Dirstate too small to be valid
         (< (file-attribute-size dirstate-attr) 40)
         (progn
           (setf repo-relative-filename
                 (file-relative-name truename repo))
           ;; We only try dealing with ASCII filenames
           (string-match-p "[^[:ascii:]]" repo-relative-filename)))
        'unsupported
      (let* ((dirstate-entry
              (vc-hg--cached-dirstate-search
               dirstate dirstate-attr repo-relative-filename))
             (state (car dirstate-entry))
             (stat (file-attributes
                    (concat repo repo-relative-filename))))
        (cond ((eq state ?r) 'removed)
              ((and (not state) stat)
               (condition-case nil
                   (if (vc-hg--file-ignored-p repo repo-relative-filename)
                       'ignored
                     'unregistered)
                 (vc-hg-unsupported-syntax 'unsupported)))
              ((and state (not stat)) 'missing)
              ((eq state ?n)
               (let ((vc-hg-size (nth 2 dirstate-entry))
                     (vc-hg-mtime (nth 3 dirstate-entry))
                     (fs-size (file-attribute-size stat))
		     (fs-mtime (time-convert
				(file-attribute-modification-time stat)
				'integer)))
                 (if (and (eql vc-hg-size fs-size) (eql vc-hg-mtime fs-mtime))
                     'up-to-date
                   'edited)))
              ((eq state ?a) 'added)
              (state 'unsupported))))))

;;; Miscellaneous

(defun vc-hg-previous-revision (_file rev)
  ;; We can't simply decrement by 1, because that revision might be
  ;; e.g. on a different branch (bug#22032).
  (with-temp-buffer
    (and (eq 0
             (vc-hg-command t nil nil "id" "-n" "-r" (concat rev "^")))
         ;; Trim the trailing newline.
         (buffer-substring (point-min) (1- (point-max))))))

(defun vc-hg-next-revision (_file rev)
  (let ((newrev (1+ (string-to-number rev)))
        (tip-revision
         (with-temp-buffer
           (vc-hg-command t 0 nil "tip" "--style=default")
           (goto-char (point-min))
           (re-search-forward "^changeset:[ \t]*\\([0-9]+\\):")
           (string-to-number (match-string-no-properties 1)))))
    ;; We don't want to exceed the maximum possible revision number, ie
    ;; the tip revision.
    (when (<= newrev tip-revision)
      (number-to-string newrev))))

;; Modeled after the similar function in vc-bzr.el
(defun vc-hg-delete-file (file)
  "Delete FILE and delete it in the hg repository."
  (condition-case ()
      (delete-file file)
    (file-error nil))
  (vc-hg-command nil 0 file "remove" "--after" "--force"))

;; Modeled after the similar function in vc-bzr.el
(defun vc-hg-rename-file (old new)
  "Rename file from OLD to NEW using `hg mv'."
  (vc-hg-command nil 0 (expand-file-name new) "mv"
                 (expand-file-name old)))

(defun vc-hg-register (files &optional _comment)
  "Register FILES under hg. COMMENT is ignored."
  (vc-hg-command nil 0 files "add"))

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

(defalias 'vc-hg-responsible-p #'vc-hg-root)

(defun vc-hg-unregister (file)
  "Unregister FILE from hg."
  (vc-hg-command nil 0 file "forget"))

(declare-function log-edit-extract-headers "log-edit" (headers string))
(declare-function log-edit-mode "log-edit" ())
(declare-function log-edit--toggle-amend "log-edit" (last-msg-fn))

(defun vc-hg-log-edit-toggle-amend ()
  "Toggle whether this will amend the previous commit.
If toggling on, also insert its message into the buffer."
  (interactive)
  (log-edit--toggle-amend
   (lambda ()
     (with-output-to-string
       (vc-hg-command
        standard-output 1 nil
        "log" "--limit=1" "--template" "{desc}")))))

(defvar vc-hg-log-edit-mode-map
  (let ((map (make-sparse-keymap "Hg-Log-Edit")))
    (define-key map "\C-c\C-e" #'vc-hg-log-edit-toggle-amend)
    map))

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

(defun vc-hg-checkin (files comment &optional _rev)
  "Hg-specific version of `vc-backend-checkin'.
REV is ignored."
  (let ((amend-extract-fn
         (lambda (value)
           (when (equal value "yes")
             (list "--amend")))))
    (apply #'vc-hg-command nil 0 files
           (nconc (list "commit" "-m")
                  (log-edit-extract-headers `(("Author" . "--user")
                                              ("Date" . "--date")
                                              ("Amend" . ,amend-extract-fn))
                                            comment)))))

(defun vc-hg-find-revision (file rev buffer)
  (let ((coding-system-for-read 'binary)
        (coding-system-for-write 'binary))
    (if rev
        (vc-hg-command buffer 0 file "cat" "-r" rev)
      (vc-hg-command buffer 0 file "cat"))))

(defun vc-hg-find-ignore-file (file)
  "Return the root directory of the repository of FILE."
  (expand-file-name ".hgignore"
		    (vc-hg-root file)))

;; Modeled after the similar function in vc-bzr.el
(defun vc-hg-checkout (file &optional rev)
  "Retrieve a revision of FILE.
EDITABLE is ignored.
REV is the revision to check out into WORKFILE."
  (let ((coding-system-for-read 'binary)
        (coding-system-for-write 'binary))
  (with-current-buffer (or (get-file-buffer file) (current-buffer))
    (if rev
        (vc-hg-command t 0 file "cat" "-r" rev)
      (vc-hg-command t 0 file "cat")))))

(defun vc-hg-resolve-when-done ()
  "Call \"hg resolve -m\" if the conflict markers have been removed."
  (save-excursion
    (goto-char (point-min))
    (unless (re-search-forward "^<<<<<<< " nil t)
      (vc-hg-command nil 0 buffer-file-name "resolve" "-m")
      ;; Remove the hook so that it is not called multiple times.
      (remove-hook 'after-save-hook #'vc-hg-resolve-when-done t))))

(defun vc-hg-find-file-hook ()
  (when (and buffer-file-name
             ;; Hg does not seem to have a "conflict" status, eg
             ;; hg http://bz.selenic.com/show_bug.cgi?id=2724
             (memq (vc-state buffer-file-name) '(edited conflict))
             ;; Maybe go on to check that "hg resolve -l" says "U"?
             ;; If "hg resolve -l" says there's a conflict but there are no
             ;; conflict markers, it's not clear what we should do.
             (save-excursion
               (goto-char (point-min))
               (re-search-forward "^<<<<<<< " nil t)))
    ;; Hg may not recognize "conflict" as a state, but we can do better.
    (vc-file-setprop buffer-file-name 'vc-state 'conflict)
    (smerge-start-session)
    (add-hook 'after-save-hook #'vc-hg-resolve-when-done nil t)
    (vc-message-unresolved-conflicts buffer-file-name)))


;; Modeled after the similar function in vc-bzr.el
(defun vc-hg-revert (file &optional contents-done)
  (unless contents-done
    (with-temp-buffer
      (apply #'vc-hg-command
             t 0 file
             "revert"
             (append (vc-switches 'hg 'revert))))))

;;; Hg specific functionality.

(defvar vc-hg-extra-menu-map
  (let ((map (make-sparse-keymap)))
    map))

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

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

(defvar log-view-vc-backend)

(cl-defstruct (vc-hg-extra-fileinfo
            (:copier nil)
            (:constructor vc-hg-create-extra-fileinfo (rename-state extra-name))
            (:conc-name vc-hg-extra-fileinfo->))
  rename-state        ;; rename or copy state
  extra-name)         ;; original name for copies and rename targets, new name for

(declare-function vc-default-dir-printer "vc-dir" (backend fileentry))

(defun vc-hg-dir-printer (info)
  "Pretty-printer for the vc-dir-fileinfo structure."
  (let ((extra (vc-dir-fileinfo->extra info)))
    (vc-default-dir-printer 'Hg info)
    (when extra
      (insert (propertize
               (format "   (%s %s)"
                       (pcase (vc-hg-extra-fileinfo->rename-state extra)
                         ('copied "copied from")
                         ('renamed-from "renamed from")
                         ('renamed-to "renamed to"))
                       (vc-hg-extra-fileinfo->extra-name extra))
               'face 'font-lock-comment-face)))))

(defun vc-hg-after-dir-status (update-function)
  (let ((file nil)
        (translation '((?= . up-to-date)
                       (?C . up-to-date)
                       (?A . added)
                       (?R . removed)
                       (?M . edited)
                       (?I . ignored)
                       (?! . missing)
                       (?  . copy-rename-line)
                       (?? . unregistered)))
        (translated nil)
        (result nil)
        (last-added nil)
        (last-line-copy nil))
      (goto-char (point-min))
      (while (not (eobp))
        (setq translated (cdr (assoc (char-after) translation)))
        (setq file
              (buffer-substring-no-properties (+ (point) 2)
                                              (line-end-position)))
        (cond ((not translated)
               (setq last-line-copy nil))
              ((eq translated 'up-to-date)
               (setq last-line-copy nil))
              ((eq translated 'copy-rename-line)
               ;; For copied files the output looks like this:
               ;; A COPIED_FILE_NAME
               ;;   ORIGINAL_FILE_NAME
               (setf (nth 2 last-added)
                     (vc-hg-create-extra-fileinfo 'copied file))
               (setq last-line-copy t))
              ((and last-line-copy (eq translated 'removed))
               ;; For renamed files the output looks like this:
               ;; A NEW_FILE_NAME
               ;;   ORIGINAL_FILE_NAME
               ;; R ORIGINAL_FILE_NAME
               ;; We need to adjust the previous entry to not think it is a copy.
               (setf (vc-hg-extra-fileinfo->rename-state (nth 2 last-added))
                     'renamed-from)
               (push (list file translated
                           (vc-hg-create-extra-fileinfo
                            'renamed-to (nth 0 last-added))) result)
               (setq last-line-copy nil))
              (t
               (setq last-added (list file translated nil))
               (push last-added result)
               (setq last-line-copy nil)))
        (forward-line))
      (funcall update-function result)))

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

(defun vc-hg-dir-status-files (dir files update-function)
  ;; XXX: We can't pass DIR directly to 'hg status' because that
  ;; returns all ignored files if FILES is non-nil (bug#22481).
  (let ((default-directory dir))
    ;; TODO: Use "--config 'status.relative=1'" instead of "re:"
    ;; when we're allowed to depend on Mercurial 4.2+
    ;; (it's a bit faster).
    (vc-hg-command (current-buffer) 'async files
                   "status" "re:" "-I" "."
                   (concat "-mardu" (if files "i"))
                   "-C"))
  (vc-run-delayed
    (vc-hg-after-dir-status update-function)))

(defun vc-hg-dir-extra-headers (dir)
  "Generate extra status headers for a repository in DIR.
This runs the command \"hg summary\"."
  (let ((default-directory dir))
    (with-temp-buffer
      (vc-hg-command t 0 nil "summary")
      (goto-char (point-min))
      (mapconcat
       #'identity
       (let (result)
         (while (not (eobp))
           (push
            (let ((entry (if (looking-at "\\([^ ].*\\): \\(.*\\)")
                             (cons (capitalize (match-string 1)) (match-string 2))
                           (cons "" (buffer-substring (point) (line-end-position))))))
              (concat
               (propertize (format "%-11s: " (car entry)) 'face 'vc-dir-header)
               (propertize (cdr entry) 'face 'vc-dir-header-value)))
            result)
           (forward-line))
         (nreverse result))
       "\n"))))

(defun vc-hg-log-incoming (buffer remote-location)
  (vc-setup-buffer buffer)
  (vc-hg-command buffer 1 nil "incoming" "-n" (unless (string= remote-location "")
						remote-location)))

(defun vc-hg-log-outgoing (buffer remote-location)
  (vc-setup-buffer buffer)
  (vc-hg-command buffer 1 nil "outgoing" "-n" (unless (string= remote-location "")
						remote-location)))

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

(autoload 'vc-do-async-command "vc-dispatcher")
(autoload 'log-view-get-marked "log-view")
(defvar compilation-directory)
(defvar compilation-arguments)  ; defined in compile.el

(defun vc-hg--pushpull (command prompt post-processing &optional obsolete)
  "Run COMMAND (a string; either push or pull) on the current Hg branch.
If PROMPT is non-nil, prompt for the Hg command to run.
POST-PROCESSING is a list of commands to execute after the command.
If OBSOLETE is non-nil, behave like the old versions of the Hg push/pull
commands, which only operated on marked files."
  (let (marked-list)
    ;; The `vc-hg-pull' and `vc-hg-push' commands existed before the
    ;; `pull'/`push' VC actions were implemented.
    ;; The following is for backwards compatibility.
    (if (and obsolete (setq marked-list (log-view-get-marked)))
	(apply #'vc-hg-command
	       nil 0 nil
	       command
	       (apply #'nconc
		      (mapcar (lambda (arg) (list "-r" arg)) marked-list)))
      (let* ((root (vc-hg-root default-directory))
	     (buffer (format "*vc-hg : %s*" (expand-file-name root)))
	      ;; Disable pager.
             (process-environment (cons "HGPLAIN=1" process-environment))
	     (hg-program vc-hg-program)
	     args)
	;; If necessary, prompt for the exact command.
        ;; TODO if pushing, prompt if no default push location - cf bzr.
	(when prompt
	  (setq args (split-string
		      (read-shell-command
                       (format "Hg %s command: " command)
                       (format "%s %s" hg-program command)
                       'vc-hg-history)
		      " " t))
	  (setq hg-program (car  args)
		command    (cadr args)
		args       (cddr args)))
	(apply #'vc-do-async-command buffer root hg-program command args)
        (with-current-buffer buffer
          (vc-run-delayed
            (dolist (cmd post-processing)
              (apply #'vc-do-command buffer nil hg-program nil cmd))
            (vc-compilation-mode 'hg)
            (setq-local compile-command
                        (concat hg-program " " command " "
                                (mapconcat #'identity args " ")
                                (mapconcat (lambda (args)
                                             (concat " && " hg-program " "
                                                     (mapconcat #'identity
                                                                args " ")))
                                           post-processing "")))
            (setq-local compilation-directory root)
            ;; Either set `compilation-buffer-name-function' locally to nil
            ;; or use `compilation-arguments' to set `name-function'.
            ;; See `compilation-buffer-name'.
            (setq-local compilation-arguments
                        (list compile-command nil
                              (lambda (_name-of-mode) buffer)
                              nil))))
	(vc-set-async-update buffer)))))

(defun vc-hg-pull (prompt)
  "Issue a Mercurial pull command.
If called interactively with a set of marked Log View buffers,
call \"hg pull -r REVS\" to pull in the specified revisions REVS.

With a prefix argument or if PROMPT is non-nil, prompt for a
specific Mercurial pull command.  The default is \"hg pull -u\",
which fetches changesets from the default remote repository and
then attempts to update the working directory."
  (interactive "P")
  (vc-hg--pushpull "pull" prompt
                   ;; Fixme: before updating the working copy to the latest
                   ;; state, should check if it's visiting an old revision.
                   ;; post-processing: list modified files and update
                   ;; NB: this will not work with "pull = --rebase"
                   ;;     or "pull = --update" in hgrc.
                   '(("--pager" "no" "status" "--rev" "." "--rev" "tip")
                     ("update"))
                   (called-interactively-p 'interactive)))

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

If called interactively with a set of marked Log View buffers,
call \"hg push -r REVS\" to push the specified revisions REVS."
  (interactive "P")
  (vc-hg--pushpull "push" prompt nil (called-interactively-p 'interactive)))

(defun vc-hg-merge-branch ()
  "Prompt for revision and merge it into working directory.
This runs the command \"hg merge\"."
  (let* ((root (vc-hg-root default-directory))
	 (buffer (format "*vc-hg : %s*" (expand-file-name root)))
         ;; Disable pager.
         (process-environment (cons "HGPLAIN=1" process-environment))
         (branch (vc-read-revision "Revision to merge: ")))
    (apply #'vc-do-async-command buffer root vc-hg-program
           (append '("--config" "ui.report_untrusted=0" "merge")
                   (unless (string= branch "") (list branch))))
    (with-current-buffer buffer (vc-run-delayed (vc-compilation-mode 'hg)))
    (vc-set-async-update buffer)))

;;; Internal functions

(defun vc-hg-command (buffer okstatus file-or-list &rest flags)
  "A wrapper around `vc-do-command' for use in vc-hg.el.
This function differs from vc-do-command in that it invokes
`vc-hg-program', and passes `vc-hg-global-switches' to it before FLAGS."
  ;; Disable pager.
  (let ((process-environment (cons "HGPLAIN=1" process-environment))
        (flags (append '("--config" "ui.report_untrusted=0") flags)))
    (apply #'vc-do-command (or buffer "*vc*")
           okstatus vc-hg-program file-or-list
           (if (stringp vc-hg-global-switches)
               (cons vc-hg-global-switches flags)
             (append vc-hg-global-switches
                     flags)))))

(defun vc-hg-root (file)
  (vc-find-root file ".hg"))

(defun vc-hg-repository-url (file-or-dir &optional remote-name)
  (let ((default-directory (vc-hg-root file-or-dir)))
    (with-temp-buffer
      (vc-hg-command (current-buffer) 0 nil
                     "config"
                     (concat "paths." (or remote-name "default")))
      (buffer-substring-no-properties (point-min) (1- (point-max))))))

(provide 'vc-hg)

;;; vc-hg.el ends here

debug log:

solving 4a64caa36b ...
found 4a64caa36b in https://git.savannah.gnu.org/cgit/emacs.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).