emacs / lisp / ediff.el

   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
;;; ediff.el --- a comprehensive visual interface to diff & patch

;; Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Free Software Foundation, Inc.

;; Author: Michael Kifer <kifer@cs.stonybrook.edu>
;; Created: February 2, 1994
;; Keywords: comparing, merging, patching, tools, unix

(defconst ediff-version "2.78" "The current version of Ediff")
(defconst ediff-date "May 18, 2003" "Date of last update")  


;; 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 2, 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; Never read that diff output again!
;; Apply patch interactively!
;; Merge with ease!

;; This package provides a convenient way of simultaneous browsing through
;; the differences between a pair (or a triple) of files or buffers.  The
;; files being compared, file-A, file-B, and file-C (if applicable) are
;; shown in separate windows (side by side, one above the another, or in
;; separate frames), and the differences are highlighted as you step
;; through them.  You can also copy difference regions from one buffer to
;; another (and recover old differences if you change your mind).

;; Ediff also supports merging operations on files and buffers, including
;; merging using ancestor versions.  Both comparison and merging operations can
;; be performed on directories, i.e., by pairwise comparison of files in those
;; directories.

;; In addition, Ediff can apply a patch to a file and then let you step
;; though both files, the patched and the original one, simultaneously,
;; difference-by-difference.  You can even apply a patch right out of a
;; mail buffer, i.e., patches received by mail don't even have to be saved.
;; Since Ediff lets you copy differences between buffers, you can, in
;; effect, apply patches selectively (i.e., you can copy a difference
;; region from file_orig to file, thereby undoing any particular patch that
;; you don't like).

;; Ediff is aware of version control, which lets the user compare
;; files with their older versions.  Ediff can also work with remote and
;; compressed files.  Details are given below.

;; Finally, Ediff supports directory-level comparison, merging and patching.
;; See the on-line manual for details.

;; This package builds upon the ideas borrowed from emerge.el and several
;; Ediff's functions are adaptations from emerge.el.  Much of the functionality
;; Ediff provides is also influenced by emerge.el.

;; The present version of Ediff supersedes Emerge.  It provides a superior user
;; interface and has numerous major features not found in Emerge.  In
;; particular, it can do patching, and 2-way and 3-way file comparison,
;; merging, and directory operations.



;;; Bugs:

;;  1. The undo command doesn't restore deleted regions well.  That is, if
;;  you delete all characters in a difference region and then invoke
;;  `undo', the reinstated text will most likely be inserted outside of
;;  what Ediff thinks is the current difference region. (This problem
;;  doesn't seem to exist with XEmacs.)
;;
;;  If at any point you feel that difference regions are no longer correct,
;;  you can hit '!' to recompute the differences.

;;  2. On a monochrome display, the repertoire of faces with which to
;;  highlight fine differences is limited.  By default, Ediff is using
;;  underlining.  However, if the region is already underlined by some other
;;  overlays, there is no simple way to temporarily remove that residual
;;  underlining.  This problem occurs when a buffer is highlighted with
;;  hilit19.el or font-lock.el packages.  If this residual highlighting gets
;;  in the way, you can do the following.  Both font-lock.el and hilit19.el
;;  provide commands for unhighlighting buffers.  You can either place these
;;  commands in `ediff-prepare-buffer-hook' (which will unhighlight every
;;  buffer used by Ediff) or you can execute them interactively, at any time
;;  and on any buffer.


;;; Acknowledgements:

;; Ediff was inspired by Dale R. Worley's <drw@math.mit.edu> emerge.el.
;; Ediff would not have been possible without the help and encouragement of
;; its many users.  See Ediff on-line Info for the full list of those who
;; helped.  Improved defaults in Ediff file-name reading commands.

;;; Code:

(provide 'ediff)

;; Compiler pacifier
(defvar cvs-cookie-handle)
(defvar ediff-last-dir-patch)
(defvar ediff-patch-default-directory)

(and noninteractive
     (eval-when-compile
	 (load-library "dired")
	 (load-library "info")
	 (load "pcl-cvs" 'noerror)))
(eval-when-compile
  (let ((load-path (cons (expand-file-name ".") load-path)))
    (or (featurep 'ediff-init)
	(load "ediff-init.el" nil nil 'nosuffix))
    (or (featurep 'ediff-mult)
	(load "ediff-mult.el" nil nil 'nosuffix))
    (or (featurep 'ediff-ptch)
	(load "ediff-ptch.el" nil nil 'nosuffix))
    (or (featurep 'ediff-vers)
	(load "ediff-vers.el" nil nil 'nosuffix))
    ))
;; end pacifier

(require 'ediff-init)
(require 'ediff-mult)  ; required because of the registry stuff

(defgroup ediff nil
  "A comprehensive visual interface to diff & patch"
  :tag "Ediff"
  :group 'tools)


(defcustom ediff-use-last-dir nil
  "*If t, Ediff will use previous directory as default when reading file name."
  :type 'boolean
  :group 'ediff)

;; Last directory used by an Ediff command for file-A.
(defvar ediff-last-dir-A nil)
;; Last directory used by an Ediff command for file-B.
(defvar ediff-last-dir-B nil)
;; Last directory used by an Ediff command for file-C.
(defvar ediff-last-dir-C nil)
;; Last directory used by an Ediff command for the ancestor file.
(defvar ediff-last-dir-ancestor nil)
;; Last directory used by an Ediff command as the output directory for merge.
(defvar ediff-last-merge-autostore-dir nil)


;; Used as a startup hook to set `_orig' patch file read-only.
(defun ediff-set-read-only-in-buf-A ()
  (ediff-with-current-buffer ediff-buffer-A
    (toggle-read-only 1)))

;; Return a plausible default for ediff's first file:
;; In dired, return the file number FILENO (or 0) in the list
;; (all-selected-files, filename under the cursor), where directories are
;; ignored. Otherwise, return DEFAULT file name, if non-nil. Else,
;; if the buffer is visiting a file, return that file name.
(defun ediff-get-default-file-name (&optional default fileno)
  (cond ((eq major-mode 'dired-mode)
	 (let ((current (dired-get-filename nil 'no-error))
	       (marked (condition-case nil
			   (dired-get-marked-files 'no-dir)
			 (error nil)))
	       aux-list choices result)
	   (or (integerp fileno) (setq fileno 0))
	   (if (stringp default)
	       (setq aux-list (cons default aux-list)))
	   (if (and (stringp current) (not (file-directory-p current)))
	       (setq aux-list (cons current aux-list)))
	   (setq choices (nconc  marked aux-list))
	   (setq result (elt choices fileno))
	   (or result
	       default)))
	((stringp default) default)
	((buffer-file-name (current-buffer))
	 (file-name-nondirectory (buffer-file-name (current-buffer))))
	))

;;; Compare files/buffers

;;;###autoload
(defun ediff-files (file-A file-B &optional startup-hooks)
  "Run Ediff on a pair of files, FILE-A and FILE-B."
  (interactive
   (let ((dir-A (if ediff-use-last-dir
		    ediff-last-dir-A
		  default-directory))
	 dir-B f)
     (list (setq f (ediff-read-file-name
		    "File A to compare"
		    dir-A
		    (ediff-get-default-file-name)
		    'no-dirs))
	   (ediff-read-file-name "File B to compare"
				 (setq dir-B
				       (if ediff-use-last-dir
					   ediff-last-dir-B
					 (file-name-directory f)))
				 (progn
				   (setq file-name-history
					 (cons (ediff-abbreviate-file-name
						(expand-file-name
						 (file-name-nondirectory f)
						 dir-B))
					       file-name-history))
				   (ediff-get-default-file-name f 1)))
	   )))
  (ediff-files-internal file-A
			(if (file-directory-p file-B)
			    (expand-file-name
			     (file-name-nondirectory file-A) file-B)
			  file-B)
			nil ; file-C
			startup-hooks
			'ediff-files))

;;;###autoload
(defun ediff-files3 (file-A file-B file-C &optional startup-hooks)
  "Run Ediff on three files, FILE-A, FILE-B, and FILE-C."
  (interactive
   (let ((dir-A (if ediff-use-last-dir
		    ediff-last-dir-A
		  default-directory))
	 dir-B dir-C f ff)
     (list (setq f (ediff-read-file-name
		    "File A to compare"
		    dir-A
		    (ediff-get-default-file-name)
		    'no-dirs))
	   (setq ff (ediff-read-file-name "File B to compare"
					  (setq dir-B
						(if ediff-use-last-dir
						    ediff-last-dir-B
						  (file-name-directory f)))
					  (progn
					    (setq file-name-history
						  (cons
						   (ediff-abbreviate-file-name
						    (expand-file-name
						     (file-name-nondirectory f)
						     dir-B))
						   file-name-history))
					    (ediff-get-default-file-name f 1))))
	   (ediff-read-file-name "File C to compare"
				 (setq dir-C (if ediff-use-last-dir
						 ediff-last-dir-C
					       (file-name-directory ff)))
				 (progn
				   (setq file-name-history
					 (cons (ediff-abbreviate-file-name
						(expand-file-name
						 (file-name-nondirectory ff)
						 dir-C))
					       file-name-history))
				   (ediff-get-default-file-name ff 2)))
	   )))
  (ediff-files-internal file-A
			(if (file-directory-p file-B)
			    (expand-file-name
			     (file-name-nondirectory file-A) file-B)
			  file-B)
			(if (file-directory-p file-C)
			    (expand-file-name
			     (file-name-nondirectory file-A) file-C)
			  file-C)
			startup-hooks
			'ediff-files3))

;;;###autoload
(defalias 'ediff3 'ediff-files3)


;; Visit FILE and arrange its buffer to Ediff's liking.
;; FILE is actually a variable symbol that must contain a true file name.
;; BUFFER-NAME is a variable symbol, which will get the buffer object into
;; which FILE is read.
;; LAST-DIR is the directory variable symbol where FILE's
;; directory name should be returned.  HOOKS-VAR is a variable symbol that will
;; be assigned the hook to be executed after `ediff-startup' is finished.
;; `ediff-find-file' arranges that the temp files it might create will be
;; deleted.
(defun ediff-find-file (file-var buffer-name &optional last-dir hooks-var)
  (let* ((file (symbol-value file-var))
	 (file-magic (ediff-filename-magic-p file))
	 (temp-file-name-prefix (file-name-nondirectory file)))
    (cond ((not (file-readable-p file))
	   (error "File `%s' does not exist or is not readable" file))
	  ((file-directory-p file)
	   (error "File `%s' is a directory" file)))

    ;; some of the commands, below, require full file name
    (setq file (expand-file-name file))

    ;; Record the directory of the file
    (if last-dir
	(set last-dir (expand-file-name (file-name-directory file))))

    ;; Setup the buffer
    (set buffer-name (find-file-noselect file))

    (ediff-with-current-buffer (symbol-value buffer-name)
      (widen) ; Make sure the entire file is seen
      (cond (file-magic  ;   file has a handler, such as jka-compr-handler or
	     		 ;;; ange-ftp-hook-function--arrange for temp file
	     (ediff-verify-file-buffer 'magic)
	     (setq file
		   (ediff-make-temp-file
		    (current-buffer) temp-file-name-prefix))
	     (set hooks-var (cons `(lambda () (delete-file ,file))
				  (symbol-value hooks-var))))
	    ;; file processed via auto-mode-alist, a la uncompress.el
	    ((not (equal (file-truename file)
			 (file-truename (buffer-file-name))))
	     (setq file
		   (ediff-make-temp-file
		    (current-buffer) temp-file-name-prefix))
	     (set hooks-var (cons `(lambda () (delete-file ,file))
				  (symbol-value hooks-var))))
	    (t ;; plain file---just check that the file matches the buffer
	     (ediff-verify-file-buffer))))
    (set file-var file)))

;; MERGE-BUFFER-FILE is the file to be associated with the merge buffer
(defun ediff-files-internal (file-A file-B file-C startup-hooks job-name
				    &optional merge-buffer-file)
  (let (buf-A buf-B buf-C)
    (if (string= file-A file-B)
	(error "Files A and B are the same"))
    (if (stringp file-C)
	(or (and (string= file-A file-C) (error "Files A and C are the same"))
	    (and (string= file-B file-C) (error "Files B and C are the same"))))
    (message "Reading file %s ... " file-A)
    ;;(sit-for 0)
    (ediff-find-file 'file-A 'buf-A 'ediff-last-dir-A 'startup-hooks)
    (message "Reading file %s ... " file-B)
    ;;(sit-for 0)
    (ediff-find-file 'file-B 'buf-B 'ediff-last-dir-B 'startup-hooks)
    (if (stringp file-C)
	(progn
	  (message "Reading file %s ... " file-C)
	  ;;(sit-for 0)
	  (ediff-find-file
	   'file-C 'buf-C
	   (if (eq job-name 'ediff-merge-files-with-ancestor)
	       'ediff-last-dir-ancestor 'ediff-last-dir-C)
	   'startup-hooks)))
    (ediff-setup buf-A file-A
		 buf-B file-B
		 buf-C file-C
		 startup-hooks
		 (list (cons 'ediff-job-name job-name))
		 merge-buffer-file)))


;;;###autoload
(defalias 'ediff 'ediff-files)

;;;###autoload
(defun ediff-backup (file)
  "Run Ediff on FILE and its backup file.
Uses the latest backup, if there are several numerical backups.
If this file is a backup, `ediff' it with its original."
  (interactive (list (read-file-name "Ediff (file with backup): ")))
  ;; The code is taken from `diff-backup'.
  (require 'diff)
  (let (bak ori)
    (if (backup-file-name-p file)
	(setq bak file
	      ori (file-name-sans-versions file))
      (setq bak (or (diff-latest-backup-file file)
		    (error "No backup found for %s" file))
	    ori file))
    (ediff-files bak ori)))

;;;###autoload
(defun ediff-buffers (buffer-A buffer-B &optional startup-hooks job-name)
  "Run Ediff on a pair of buffers, BUFFER-A and BUFFER-B."
  (interactive
   (let (bf)
     (list (setq bf (read-buffer "Buffer A to compare: "
				 (ediff-other-buffer "") t))
	   (read-buffer "Buffer B to compare: "
			(progn
			  ;; realign buffers so that two visible bufs will be
			  ;; at the top
			  (save-window-excursion (other-window 1))
			  (ediff-other-buffer bf))
			t))))
  (or job-name (setq job-name 'ediff-buffers))
  (ediff-buffers-internal buffer-A buffer-B nil startup-hooks job-name))

;;;###autoload
(defalias 'ebuffers 'ediff-buffers)


;;;###autoload
(defun ediff-buffers3 (buffer-A buffer-B buffer-C
				 &optional startup-hooks job-name)
  "Run Ediff on three buffers, BUFFER-A, BUFFER-B, and BUFFER-C."
  (interactive
   (let (bf bff)
     (list (setq bf (read-buffer "Buffer A to compare: "
				 (ediff-other-buffer "") t))
	   (setq bff (read-buffer "Buffer B to compare: "
				  (progn
				    ;; realign buffers so that two visible
				    ;; bufs will be at the top
				    (save-window-excursion (other-window 1))
				    (ediff-other-buffer bf))
				  t))
	   (read-buffer "Buffer C to compare: "
				  (progn
				    ;; realign buffers so that three visible
				    ;; bufs will be at the top
				    (save-window-excursion (other-window 1))
				    (ediff-other-buffer (list bf bff)))
				  t)
	   )))
  (or job-name (setq job-name 'ediff-buffers3))
  (ediff-buffers-internal buffer-A buffer-B buffer-C startup-hooks job-name))

;;;###autoload
(defalias 'ebuffers3 'ediff-buffers3)



;; MERGE-BUFFER-FILE is the file to be associated with the merge buffer
(defun ediff-buffers-internal (buf-A buf-B buf-C startup-hooks job-name
				     &optional merge-buffer-file)
  (let* ((buf-A-file-name (buffer-file-name (get-buffer buf-A)))
	 (buf-B-file-name (buffer-file-name (get-buffer buf-B)))
	 (buf-C-is-alive (ediff-buffer-live-p buf-C))
	 (buf-C-file-name (if buf-C-is-alive
			      (buffer-file-name (get-buffer buf-B))))
	 file-A file-B file-C)
    (if (not (ediff-buffer-live-p buf-A))
	(error "Buffer %S doesn't exist" buf-A))
    (if (not (ediff-buffer-live-p buf-B))
	(error "Buffer %S doesn't exist" buf-B))
    (let ((ediff-job-name job-name))
      (if (and ediff-3way-comparison-job
	       (not buf-C-is-alive))
	  (error "Buffer %S doesn't exist" buf-C)))
    (if (stringp buf-A-file-name)
	(setq buf-A-file-name (file-name-nondirectory buf-A-file-name)))
    (if (stringp buf-B-file-name)
	(setq buf-B-file-name (file-name-nondirectory buf-B-file-name)))
    (if (stringp buf-C-file-name)
	(setq buf-C-file-name (file-name-nondirectory buf-C-file-name)))

    (setq file-A (ediff-make-temp-file buf-A buf-A-file-name)
	  file-B (ediff-make-temp-file buf-B buf-B-file-name))
    (if buf-C-is-alive
	(setq file-C (ediff-make-temp-file buf-C buf-C-file-name)))

    (ediff-setup (get-buffer buf-A) file-A
		 (get-buffer buf-B) file-B
		 (if buf-C-is-alive (get-buffer buf-C))
		 file-C
		 (cons `(lambda ()
			  (delete-file ,file-A)
			  (delete-file ,file-B)
			  (if (stringp ,file-C) (delete-file ,file-C)))
		       startup-hooks)
		 (list (cons 'ediff-job-name job-name))
		 merge-buffer-file)))


;;; Directory and file group operations

;; Get appropriate default name for directory:
;; If ediff-use-last-dir, use ediff-last-dir-A.
;; In dired mode, use the directory that is under the point (if any);
;; otherwise, use default-directory
(defun ediff-get-default-directory-name ()
  (cond (ediff-use-last-dir ediff-last-dir-A)
	((eq major-mode 'dired-mode)
	 (let ((f (dired-get-filename nil 'noerror)))
	   (if (and (stringp f) (file-directory-p f))
	       f
	     default-directory)))
	(t default-directory)))


;;;###autoload
(defun ediff-directories (dir1 dir2 regexp)
  "Run Ediff on a pair of directories, DIR1 and DIR2, comparing files that have
the same name in both.  The third argument, REGEXP, is nil or a regular
expression; only file names that match the regexp are considered."
  (interactive
   (let ((dir-A (ediff-get-default-directory-name))
	 f)
     (list (setq f (ediff-read-file-name "Directory A to compare:" dir-A nil))
	   (ediff-read-file-name "Directory B to compare:"
				 (if ediff-use-last-dir
				     ediff-last-dir-B
				   (ediff-strip-last-dir f))
				 nil)
	   (read-string (format
			 "Filter through regular expression (default %S): "
			 (eval ediff-default-filtering-regexp))
			(eval ediff-default-filtering-regexp)
			'ediff-filtering-regexp-history)
	   )))
  (ediff-directories-internal
   dir1 dir2 nil regexp 'ediff-files 'ediff-directories
   ))

;;;###autoload
(defalias 'edirs 'ediff-directories)


;;;###autoload
(defun ediff-directory-revisions (dir1 regexp)
  "Run Ediff on a directory, DIR1, comparing its files with their revisions.
The second argument, REGEXP, is a regular expression that filters the file
names.  Only the files that are under revision control are taken into account."
  (interactive
   (let ((dir-A (ediff-get-default-directory-name)))
     (list (ediff-read-file-name
	    "Directory to compare with revision:" dir-A nil)
	   (read-string (format
			 "Filter through regular expression (default %S): "
			 (eval ediff-default-filtering-regexp))
			(eval ediff-default-filtering-regexp)
			'ediff-filtering-regexp-history)
	   )))
  (ediff-directory-revisions-internal
   dir1 regexp 'ediff-revision 'ediff-directory-revisions
   ))

;;;###autoload
(defalias 'edir-revisions 'ediff-directory-revisions)


;;;###autoload
(defun ediff-directories3 (dir1 dir2 dir3 regexp)
  "Run Ediff on three directories, DIR1, DIR2, and DIR3, comparing files that
have the same name in all three.  The last argument, REGEXP, is nil or a
regular expression; only file names that match the regexp are considered."

  (interactive
   (let ((dir-A (ediff-get-default-directory-name))
	 f)
     (list (setq f (ediff-read-file-name "Directory A to compare:" dir-A nil))
	   (setq f (ediff-read-file-name "Directory B to compare:"
					 (if ediff-use-last-dir
					     ediff-last-dir-B
					   (ediff-strip-last-dir f))
					 nil))
	   (ediff-read-file-name "Directory C to compare:"
				 (if ediff-use-last-dir
				     ediff-last-dir-C
				   (ediff-strip-last-dir f))
				 nil)
	   (read-string (format
			 "Filter through regular expression (default %S): "
			 (eval ediff-default-filtering-regexp))
			(eval ediff-default-filtering-regexp)
			'ediff-filtering-regexp-history)
	   )))
  (ediff-directories-internal
   dir1 dir2 dir3 regexp 'ediff-files3 'ediff-directories3
   ))

;;;###autoload
(defalias 'edirs3 'ediff-directories3)

;;;###autoload
(defun ediff-merge-directories (dir1 dir2 regexp &optional merge-autostore-dir)
  "Run Ediff on a pair of directories, DIR1 and DIR2, merging files that have
the same name in both.  The third argument, REGEXP, is nil or a regular
expression; only file names that match the regexp are considered."
  (interactive
   (let ((dir-A (ediff-get-default-directory-name))
	 f)
     (list (setq f (ediff-read-file-name "Directory A to merge:" dir-A nil))
	   (ediff-read-file-name "Directory B to merge:"
				 (if ediff-use-last-dir
				     ediff-last-dir-B
				   (ediff-strip-last-dir f))
				 nil)
	   (read-string (format
			 "Filter through regular expression (default %S): "
			 (eval ediff-default-filtering-regexp))
			(eval ediff-default-filtering-regexp)
			'ediff-filtering-regexp-history)
	   )))
  (ediff-directories-internal
   dir1 dir2 nil regexp 'ediff-merge-files 'ediff-merge-directories
   nil merge-autostore-dir
   ))

;;;###autoload
(defalias 'edirs-merge 'ediff-merge-directories)

;;;###autoload
(defun ediff-merge-directories-with-ancestor (dir1 dir2 ancestor-dir regexp
						   &optional
						   merge-autostore-dir)
  "Merge files in directories DIR1 and DIR2 using files in ANCESTOR-DIR as ancestors.
Ediff merges files that have identical names in DIR1, DIR2.  If a pair of files
in DIR1 and DIR2 doesn't have an ancestor in ANCESTOR-DIR, Ediff will merge
without ancestor.  The fourth argument, REGEXP, is nil or a regular expression;
only file names that match the regexp are considered."
  (interactive
   (let ((dir-A (ediff-get-default-directory-name))
	 f)
     (list (setq f (ediff-read-file-name "Directory A to merge:" dir-A nil))
	   (setq f (ediff-read-file-name "Directory B to merge:"
				 (if ediff-use-last-dir
				     ediff-last-dir-B
				   (ediff-strip-last-dir f))
				 nil))
	   (ediff-read-file-name "Ancestor directory:"
				 (if ediff-use-last-dir
				     ediff-last-dir-C
				   (ediff-strip-last-dir f))
				 nil)
	   (read-string (format
			 "Filter through regular expression (default %S): "
			 (eval ediff-default-filtering-regexp))
			(eval ediff-default-filtering-regexp)
			'ediff-filtering-regexp-history)
	   )))
  (ediff-directories-internal
   dir1 dir2 ancestor-dir regexp
   'ediff-merge-files-with-ancestor 'ediff-merge-directories-with-ancestor
   nil merge-autostore-dir
   ))

;;;###autoload
(defun ediff-merge-directory-revisions (dir1 regexp
					     &optional merge-autostore-dir)
  "Run Ediff on a directory, DIR1, merging its files with their revisions.
The second argument, REGEXP, is a regular expression that filters the file
names.  Only the files that are under revision control are taken into account."
  (interactive
   (let ((dir-A (ediff-get-default-directory-name)))
     (list (ediff-read-file-name
	    "Directory to merge with revisions:" dir-A nil)
	   (read-string (format
			 "Filter through regular expression (default %S): "
			 (eval ediff-default-filtering-regexp))
			(eval ediff-default-filtering-regexp)
			'ediff-filtering-regexp-history)
	   )))
  (ediff-directory-revisions-internal
   dir1 regexp 'ediff-merge-revisions 'ediff-merge-directory-revisions
   nil merge-autostore-dir
   ))

;;;###autoload
(defalias 'edir-merge-revisions 'ediff-merge-directory-revisions)

;;;###autoload
(defun ediff-merge-directory-revisions-with-ancestor (dir1 regexp
							   &optional
							   merge-autostore-dir)
  "Run Ediff on a directory, DIR1, merging its files with their revisions and ancestors.
The second argument, REGEXP, is a regular expression that filters the file
names.  Only the files that are under revision control are taken into account."
  (interactive
   (let ((dir-A (ediff-get-default-directory-name)))
     (list (ediff-read-file-name
	    "Directory to merge with revisions and ancestors:" dir-A nil)
	   (read-string (format
			 "Filter through regular expression (default %S): "
			 (eval ediff-default-filtering-regexp))
			(eval ediff-default-filtering-regexp)
			'ediff-filtering-regexp-history)
	   )))
  (ediff-directory-revisions-internal
   dir1 regexp 'ediff-merge-revisions-with-ancestor
   'ediff-merge-directory-revisions-with-ancestor
   nil merge-autostore-dir
   ))

;;;###autoload
(defalias
  'edir-merge-revisions-with-ancestor
  'ediff-merge-directory-revisions-with-ancestor)

;;;###autoload
(defalias 'edirs-merge-with-ancestor 'ediff-merge-directories-with-ancestor)

;; Run ediff-action (ediff-files, ediff-merge, ediff-merge-with-ancestors)
;; on a pair of directories (three directories, in case of ancestor).
;; The third argument, REGEXP, is nil or a regular expression;
;; only file names that match the regexp are considered.
;; JOBNAME is the symbol indicating the meta-job to be performed.
;; MERGE-AUTOSTORE-DIR is the directory in which to store merged files.
(defun ediff-directories-internal (dir1 dir2 dir3 regexp action jobname
					&optional startup-hooks
					merge-autostore-dir)
  ;; ediff-read-file-name is set to attach a previously entered file name if
  ;; the currently entered file is a directory.  This code takes care of that.
  (setq dir1 (if (file-directory-p dir1) dir1 (file-name-directory dir1))
	dir2 (if (file-directory-p dir2) dir2 (file-name-directory dir2)))

  (if (stringp dir3)
      (setq dir3 (if (file-directory-p dir3) dir3 (file-name-directory dir3))))

  (cond ((string= dir1 dir2)
	 (error "Directories A and B are the same: %s" dir1))
	((and (eq jobname 'ediff-directories3)
	      (string= dir1 dir3))
	 (error "Directories A and C are the same: %s" dir1))
	((and (eq jobname 'ediff-directories3)
	      (string= dir2 dir3))
	 (error "Directories B and C are the same: %s" dir1)))

  (if merge-autostore-dir
      (or (stringp merge-autostore-dir)
	  (error "%s: Directory for storing merged files must be a string"
		 jobname)))
  (let (;; dir-diff-struct is of the form (common-list diff-list)
	;; It is a structure where ediff-intersect-directories returns
	;; commonalities and differences among directories
	dir-diff-struct
	meta-buf)
    (if (and ediff-autostore-merges
	     (ediff-merge-metajob jobname)
	     (not merge-autostore-dir))
	(setq merge-autostore-dir
	      (read-file-name "Save merged files in directory: "
			      (if ediff-use-last-dir
					ediff-last-merge-autostore-dir
				      (ediff-strip-last-dir dir1))
			      nil
			      'must-match)))
    ;; verify we are not merging into an orig directory
    (if merge-autostore-dir
	(cond ((and (stringp dir1) (string= merge-autostore-dir dir1))
	       (or (y-or-n-p
		    "Directory for saving merged files = Directory A.  Sure? ")
		   (error "Directory merge aborted")))
	      ((and (stringp dir2) (string= merge-autostore-dir dir2))
	       (or (y-or-n-p
		    "Directory for saving merged files = Directory B.  Sure? ")
		   (error "Directory merge aborted")))
	      ((and (stringp dir3) (string= merge-autostore-dir dir3))
	       (or (y-or-n-p
		    "Directory for saving merged files = Ancestor Directory.  Sure? ")
		   (error "Directory merge aborted")))))

    (setq dir-diff-struct (ediff-intersect-directories
			   jobname
			   regexp dir1 dir2 dir3 merge-autostore-dir))
    (setq startup-hooks
	  ;; this sets various vars in the meta buffer inside
	  ;; ediff-prepare-meta-buffer
	  (cons `(lambda ()
		   ;; tell what to do if the user clicks on a session record
		   (setq ediff-session-action-function (quote ,action))
		   ;; set ediff-dir-difference-list
		   (setq ediff-dir-difference-list
			 (cdr (quote ,dir-diff-struct))))
		startup-hooks))
    (setq meta-buf (ediff-prepare-meta-buffer
		    'ediff-filegroup-action
		    (car dir-diff-struct)
		    "*Ediff Session Group Panel"
		    'ediff-redraw-directory-group-buffer
		    jobname
		    startup-hooks))
    (ediff-show-meta-buffer meta-buf)
    ))

;; MERGE-AUTOSTORE-DIR can be given to tell ediff where to store the merged
;; files
(defun ediff-directory-revisions-internal (dir1 regexp action jobname
						&optional startup-hooks
						merge-autostore-dir)
  (setq dir1 (if (file-directory-p dir1) dir1 (file-name-directory dir1)))

  (if merge-autostore-dir
      (or (stringp merge-autostore-dir)
	  (error "%S: Directory for storing merged files must be a string"
		 jobname)))
  (let (file-list meta-buf)
    (if (and ediff-autostore-merges
	     (ediff-merge-metajob jobname)
	     (not merge-autostore-dir))
	(setq merge-autostore-dir
	      (read-file-name "Save merged files in directory: "
			      (if ediff-use-last-dir
				  ediff-last-merge-autostore-dir
				(ediff-strip-last-dir dir1))
			      nil
			      'must-match)))
    ;; verify merge-autostore-dir != dir1
    (if (and merge-autostore-dir
	     (stringp dir1)
	     (string= merge-autostore-dir dir1))
	(or (y-or-n-p
	     "Directory for saving merged file = directory A.  Sure? ")
	    (error "Merge of directory revisions aborted")))

    (setq file-list
	  (ediff-get-directory-files-under-revision
	   jobname regexp dir1 merge-autostore-dir))
    (setq startup-hooks
	  ;; this sets various vars in the meta buffer inside
	  ;; ediff-prepare-meta-buffer
	  (cons `(lambda ()
		   ;; tell what to do if the user clicks on a session record
		   (setq ediff-session-action-function (quote ,action)))
		startup-hooks))
    (setq meta-buf (ediff-prepare-meta-buffer
		    'ediff-filegroup-action
		    file-list
		    "*Ediff Session Group Panel"
		    'ediff-redraw-directory-group-buffer
		    jobname
		    startup-hooks))
    (ediff-show-meta-buffer meta-buf)
    ))


;;; Compare regions and windows

;;;###autoload
(defun ediff-windows-wordwise (dumb-mode &optional wind-A wind-B startup-hooks)
  "Compare WIND-A and WIND-B, which are selected by clicking, wordwise.
With prefix argument, DUMB-MODE, or on a non-windowing display, works as
follows:
If WIND-A is nil, use selected window.
If WIND-B is nil, use window next to WIND-A."
  (interactive "P")
  (ediff-windows dumb-mode wind-A wind-B
		 startup-hooks 'ediff-windows-wordwise 'word-mode))

;;;###autoload
(defun ediff-windows-linewise (dumb-mode &optional wind-A wind-B startup-hooks)
  "Compare WIND-A and WIND-B, which are selected by clicking, linewise.
With prefix argument, DUMB-MODE, or on a non-windowing display, works as
follows:
If WIND-A is nil, use selected window.
If WIND-B is nil, use window next to WIND-A."
  (interactive "P")
  (ediff-windows dumb-mode wind-A wind-B
		 startup-hooks 'ediff-windows-linewise nil))

;; Compare WIND-A and WIND-B, which are selected by clicking.
;; With prefix argument, DUMB-MODE, or on a non-windowing display,
;; works as follows:
;; If WIND-A is nil, use selected window.
;; If WIND-B is nil, use window next to WIND-A.
(defun ediff-windows (dumb-mode wind-A wind-B startup-hooks job-name word-mode)
  (if (or dumb-mode (not (ediff-window-display-p)))
      (setq wind-A (ediff-get-next-window wind-A nil)
	    wind-B (ediff-get-next-window wind-B wind-A))
    (setq wind-A (ediff-get-window-by-clicking wind-A nil 1)
	  wind-B (ediff-get-window-by-clicking wind-B wind-A 2)))

  (let ((buffer-A (window-buffer wind-A))
	(buffer-B (window-buffer wind-B))
	beg-A end-A beg-B end-B)

    (save-excursion
      (save-window-excursion
	(sit-for 0) ; sync before using window-start/end -- a precaution
	(select-window wind-A)
	(setq beg-A (window-start)
	      end-A (window-end))
	(select-window wind-B)
	(setq beg-B (window-start)
	      end-B (window-end))))
    (setq buffer-A
	  (ediff-clone-buffer-for-window-comparison
	   buffer-A wind-A "-Window.A-")
	  buffer-B
	  (ediff-clone-buffer-for-window-comparison
	   buffer-B wind-B "-Window.B-"))
    (ediff-regions-internal
     buffer-A beg-A end-A buffer-B beg-B end-B
     startup-hooks job-name word-mode nil)))


;;;###autoload
(defun ediff-regions-wordwise (buffer-A buffer-B &optional startup-hooks)
  "Run Ediff on a pair of regions in specified buffers.
Regions \(i.e., point and mark\) are assumed to be set in advance except
for the second region in the case both regions are from the same buffer.
In such a case the user is asked to interactively establish the second
region.
This function is effective only for relatively small regions, up to 200
lines.  For large regions, use `ediff-regions-linewise'."
  (interactive
   (let (bf)
     (list (setq bf (read-buffer "Region's A buffer: "
				 (ediff-other-buffer "") t))
	   (read-buffer "Region's B buffer: "
			(progn
			  ;; realign buffers so that two visible bufs will be
			  ;; at the top
			  (save-window-excursion (other-window 1))
			  (ediff-other-buffer bf))
			t))))
  (if (not (ediff-buffer-live-p buffer-A))
      (error "Buffer %S doesn't exist" buffer-A))
  (if (not (ediff-buffer-live-p buffer-B))
      (error "Buffer %S doesn't exist" buffer-B))


  (let ((buffer-A
         (ediff-clone-buffer-for-region-comparison buffer-A "-Region.A-"))
	(buffer-B
         (ediff-clone-buffer-for-region-comparison buffer-B "-Region.B-"))
        reg-A-beg reg-A-end reg-B-beg reg-B-end)
    (save-excursion
      (set-buffer buffer-A)
      (setq reg-A-beg (region-beginning)
	    reg-A-end (region-end))
      (set-buffer buffer-B)
      (setq reg-B-beg (region-beginning)
	    reg-B-end (region-end)))

    (ediff-regions-internal
     (get-buffer buffer-A) reg-A-beg reg-A-end
     (get-buffer buffer-B) reg-B-beg reg-B-end
     startup-hooks 'ediff-regions-wordwise 'word-mode nil)))

;;;###autoload
(defun ediff-regions-linewise (buffer-A buffer-B &optional startup-hooks)
  "Run Ediff on a pair of regions in specified buffers.
Regions \(i.e., point and mark\) are assumed to be set in advance except
for the second region in the case both regions are from the same buffer.
In such a case the user is asked to interactively establish the second
region.
Each region is enlarged to contain full lines.
This function is effective for large regions, over 100-200
lines.  For small regions, use `ediff-regions-wordwise'."
  (interactive
   (let (bf)
     (list (setq bf (read-buffer "Region A's buffer: "
				 (ediff-other-buffer "") t))
	   (read-buffer "Region B's buffer: "
			(progn
			  ;; realign buffers so that two visible bufs will be
			  ;; at the top
			  (save-window-excursion (other-window 1))
			  (ediff-other-buffer bf))
			t))))
  (if (not (ediff-buffer-live-p buffer-A))
      (error "Buffer %S doesn't exist" buffer-A))
  (if (not (ediff-buffer-live-p buffer-B))
      (error "Buffer %S doesn't exist" buffer-B))

  (let ((buffer-A
         (ediff-clone-buffer-for-region-comparison buffer-A "-Region.A-"))
	(buffer-B
         (ediff-clone-buffer-for-region-comparison buffer-B "-Region.B-"))
        reg-A-beg reg-A-end reg-B-beg reg-B-end)
    (save-excursion
      (set-buffer buffer-A)
      (setq reg-A-beg (region-beginning)
	    reg-A-end (region-end))
      ;; enlarge the region to hold full lines
      (goto-char reg-A-beg)
      (beginning-of-line)
      (setq reg-A-beg (point))
      (goto-char reg-A-end)
      (end-of-line)
      (or (eobp) (forward-char)) ; include the newline char
      (setq reg-A-end (point))

      (set-buffer buffer-B)
      (setq reg-B-beg (region-beginning)
	    reg-B-end (region-end))
      ;; enlarge the region to hold full lines
      (goto-char reg-B-beg)
      (beginning-of-line)
      (setq reg-B-beg (point))
      (goto-char reg-B-end)
      (end-of-line)
      (or (eobp) (forward-char)) ; include the newline char
      (setq reg-B-end (point))
      ) ; save excursion

    (ediff-regions-internal
     (get-buffer buffer-A) reg-A-beg reg-A-end
     (get-buffer buffer-B) reg-B-beg reg-B-end
     startup-hooks 'ediff-regions-linewise nil nil))) ; no word mode

;; compare region beg-A to end-A of buffer-A
;; to regions beg-B -- end-B in buffer-B.
(defun ediff-regions-internal (buffer-A beg-A end-A buffer-B beg-B end-B
					startup-hooks job-name word-mode
					setup-parameters)
  (let ((tmp-buffer (get-buffer-create ediff-tmp-buffer))
	overl-A overl-B
	file-A file-B)

    ;; in case beg/end-A/B aren't markers--make them into markers
    (ediff-with-current-buffer buffer-A
      (setq beg-A (move-marker (make-marker) beg-A)
	    end-A (move-marker (make-marker) end-A)))
    (ediff-with-current-buffer buffer-B
      (setq beg-B (move-marker (make-marker) beg-B)
	    end-B (move-marker (make-marker) end-B)))

    ;; make file-A
    (if word-mode
	(ediff-wordify beg-A end-A buffer-A tmp-buffer)
      (ediff-copy-to-buffer beg-A end-A buffer-A tmp-buffer))
    (setq file-A (ediff-make-temp-file tmp-buffer "regA"))

    ;; make file-B
    (if word-mode
	(ediff-wordify beg-B end-B buffer-B tmp-buffer)
      (ediff-copy-to-buffer beg-B end-B buffer-B tmp-buffer))
    (setq file-B (ediff-make-temp-file tmp-buffer "regB"))

    (setq overl-A (ediff-make-bullet-proof-overlay beg-A end-A buffer-A))
    (setq overl-B (ediff-make-bullet-proof-overlay beg-B end-B buffer-B))
    (ediff-setup buffer-A file-A
		 buffer-B file-B
		 nil nil	    ; buffer & file C
		 (cons `(lambda ()
			    (delete-file ,file-A)
			    (delete-file ,file-B))
		       startup-hooks)
		 (append
		  (list (cons 'ediff-word-mode  word-mode)
			(cons 'ediff-narrow-bounds (list overl-A overl-B))
			(cons 'ediff-job-name job-name))
		  setup-parameters))
    ))


;;; Merge files and buffers

;;;###autoload
(defalias 'ediff-merge 'ediff-merge-files)

(defsubst ediff-merge-on-startup ()
  (ediff-do-merge 0)
  (ediff-with-current-buffer ediff-buffer-C
    (set-buffer-modified-p nil)))

;;;###autoload
(defun ediff-merge-files (file-A file-B
				 ;; MERGE-BUFFER-FILE is the file to be
				 ;; associated with the merge buffer
				 &optional startup-hooks merge-buffer-file)
  "Merge two files without ancestor."
  (interactive
   (let ((dir-A (if ediff-use-last-dir
		    ediff-last-dir-A
		  default-directory))
	 dir-B f)
     (list (setq f (ediff-read-file-name
		    "File A to merge"
		    dir-A
		    (ediff-get-default-file-name)
		    'no-dirs))
	   (ediff-read-file-name "File B to merge"
				 (setq dir-B
				       (if ediff-use-last-dir
					   ediff-last-dir-B
					 (file-name-directory f)))
				 (progn
				   (setq file-name-history
					 (cons (ediff-abbreviate-file-name
						(expand-file-name
						 (file-name-nondirectory f)
						 dir-B))
					       file-name-history))
				   (ediff-get-default-file-name f 1)))
	   )))
  (setq startup-hooks (cons 'ediff-merge-on-startup startup-hooks))
  (ediff-files-internal file-A
			(if (file-directory-p file-B)
			    (expand-file-name
			     (file-name-nondirectory file-A) file-B)
			  file-B)
			  nil ; file-C
			  startup-hooks
			  'ediff-merge-files
			  merge-buffer-file))

;;;###autoload
(defun ediff-merge-files-with-ancestor (file-A file-B file-ancestor
					       &optional
					       startup-hooks
					       ;; MERGE-BUFFER-FILE is the file
					       ;; to be associated with the
					       ;; merge buffer
					       merge-buffer-file)
  "Merge two files with ancestor."
  (interactive
   (let ((dir-A (if ediff-use-last-dir
		    ediff-last-dir-A
		  default-directory))
	 dir-B dir-ancestor f ff)
     (list (setq f (ediff-read-file-name
		    "File A to merge"
		    dir-A
		    (ediff-get-default-file-name)
		    'no-dirs))
	   (setq ff (ediff-read-file-name "File B to merge"
					  (setq dir-B
						(if ediff-use-last-dir
						    ediff-last-dir-B
						  (file-name-directory f)))
					  (progn
					    (setq file-name-history
						  (cons
						   (ediff-abbreviate-file-name
						    (expand-file-name
						     (file-name-nondirectory f)
						     dir-B))
						   file-name-history))
					    (ediff-get-default-file-name f 1))))
	   (ediff-read-file-name "Ancestor file"
				 (setq dir-ancestor
				       (if ediff-use-last-dir
					   ediff-last-dir-ancestor
					 (file-name-directory ff)))
				 (progn
				   (setq file-name-history
					 (cons (ediff-abbreviate-file-name
						(expand-file-name
						 (file-name-nondirectory ff)
						 dir-ancestor))
					       file-name-history))
				   (ediff-get-default-file-name ff 2)))
	   )))
  (setq startup-hooks (cons 'ediff-merge-on-startup startup-hooks))
  (ediff-files-internal file-A
			(if (file-directory-p file-B)
			    (expand-file-name
			     (file-name-nondirectory file-A) file-B)
			  file-B)
			  file-ancestor
			  startup-hooks
			  'ediff-merge-files-with-ancestor
			  merge-buffer-file))

;;;###autoload
(defalias 'ediff-merge-with-ancestor 'ediff-merge-files-with-ancestor)

;;;###autoload
(defun ediff-merge-buffers (buffer-A buffer-B
				     &optional
				     ;; MERGE-BUFFER-FILE is the file to be
				     ;; associated with the merge buffer
				     startup-hooks job-name merge-buffer-file)
  "Merge buffers without ancestor."
  (interactive
   (let (bf)
     (list (setq bf (read-buffer "Buffer A to merge: "
				 (ediff-other-buffer "") t))
	   (read-buffer "Buffer B to merge: "
			(progn
			  ;; realign buffers so that two visible bufs will be
			  ;; at the top
			  (save-window-excursion (other-window 1))
			  (ediff-other-buffer bf))
			t))))

  (setq startup-hooks (cons 'ediff-merge-on-startup startup-hooks))
  (or job-name (setq job-name 'ediff-merge-buffers))
  (ediff-buffers-internal
   buffer-A buffer-B nil startup-hooks job-name merge-buffer-file))

;;;###autoload
(defun ediff-merge-buffers-with-ancestor (buffer-A buffer-B buffer-ancestor
						   &optional
						   startup-hooks
						   job-name
						   ;; MERGE-BUFFER-FILE is the
						   ;; file to be associated
						   ;; with the merge buffer
						   merge-buffer-file)
  "Merge buffers with ancestor."
  (interactive
   (let (bf bff)
     (list (setq bf (read-buffer "Buffer A to merge: "
				 (ediff-other-buffer "") t))
	   (setq bff (read-buffer "Buffer B to merge: "
				  (progn
				    ;; realign buffers so that two visible
				    ;; bufs will be at the top
				    (save-window-excursion (other-window 1))
				    (ediff-other-buffer bf))
				  t))
	   (read-buffer "Ancestor buffer: "
				  (progn
				    ;; realign buffers so that three visible
				    ;; bufs will be at the top
				    (save-window-excursion (other-window 1))
				    (ediff-other-buffer (list bf bff)))
				  t)
	   )))

  (setq startup-hooks (cons 'ediff-merge-on-startup startup-hooks))
  (or job-name (setq job-name 'ediff-merge-buffers-with-ancestor))
  (ediff-buffers-internal
   buffer-A buffer-B buffer-ancestor startup-hooks job-name merge-buffer-file))


;;;###autoload
(defun ediff-merge-revisions (&optional file startup-hooks merge-buffer-file)
  ;; MERGE-BUFFER-FILE is the file to be associated with the merge buffer
  "Run Ediff by merging two revisions of a file.
The file is the optional FILE argument or the file visited by the current
buffer."
  (interactive)
  (if (stringp file) (find-file file))
  (let (rev1 rev2)
    (setq rev1
	  (read-string
	   (format
	    "Version 1 to merge (default: %s's working version): "
	    (if (stringp file)
		(file-name-nondirectory file) "current buffer")))
	  rev2
	  (read-string
	   (format
	    "Version 2 to merge (default: %s): "
	    (if (stringp file)
		(file-name-nondirectory file) "current buffer"))))
    (ediff-load-version-control)
    ;; ancestor-revision=nil
    (funcall
     (intern (format "ediff-%S-merge-internal" ediff-version-control-package))
     rev1 rev2 nil startup-hooks merge-buffer-file)))


;;;###autoload
(defun ediff-merge-revisions-with-ancestor (&optional
					    file startup-hooks
					    ;; MERGE-BUFFER-FILE is the file to
					    ;; be associated with the merge
					    ;; buffer
					    merge-buffer-file)
  "Run Ediff by merging two revisions of a file with a common ancestor.
The file is the optional FILE argument or the file visited by the current
buffer."
  (interactive)
  (if (stringp file) (find-file file))
  (let (rev1 rev2 ancestor-rev)
    (setq rev1
	  (read-string
	   (format
	    "Version 1 to merge (default: %s's working version): "
	    (if (stringp file)
		(file-name-nondirectory file) "current buffer")))
	  rev2
	  (read-string
	   (format
	    "Version 2 to merge (default: %s): "
	    (if (stringp file)
		(file-name-nondirectory file) "current buffer")))
	  ancestor-rev
	  (read-string
	   (format
	    "Ancestor version (default: %s's base revision): "
	    (if (stringp file)
		(file-name-nondirectory file) "current buffer"))))
    (ediff-load-version-control)
    (funcall
     (intern (format "ediff-%S-merge-internal" ediff-version-control-package))
     rev1 rev2 ancestor-rev startup-hooks merge-buffer-file)))

;; MK: Check. This function doesn't seem to be used any more by pcvs or pcl-cvs
;;;###autoload
(defun run-ediff-from-cvs-buffer (pos)
  "Run Ediff-merge on appropriate revisions of the selected file.
First run after `M-x cvs-update'.  Then place the cursor on a line describing a
file and then run `run-ediff-from-cvs-buffer'."
  (interactive "d")
  (ediff-load-version-control)
  (let ((tin (tin-locate cvs-cookie-handle pos)))
    (if tin
	(cvs-run-ediff-on-file-descriptor tin)
      (error "There is no file to merge"))))


;;; Apply patch

;;;###autoload
(defun ediff-patch-file (&optional arg patch-buf)
  "Run Ediff by patching SOURCE-FILENAME.
If optional PATCH-BUF is given, use the patch in that buffer
and don't ask the user.
If prefix argument, then: if even argument, assume that the patch is in a
buffer. If odd -- assume it is in a file."
  (interactive "P")
  (let (source-dir source-file)
    (require 'ediff-ptch)
    (setq patch-buf
	  (ediff-get-patch-buffer
	   (if arg (prefix-numeric-value arg)) patch-buf))
    (setq source-dir (cond (ediff-use-last-dir ediff-last-dir-patch)
			   ((and (not ediff-patch-default-directory)
				 (buffer-file-name patch-buf))
			    (file-name-directory
			     (expand-file-name
			      (buffer-file-name patch-buf))))
			   (t default-directory)))
    (setq source-file
	  (read-file-name
	   "File to patch (directory, if multifile patch): "
	   ;; use an explicit initial file
	   source-dir nil nil (ediff-get-default-file-name)))
    (ediff-dispatch-file-patching-job patch-buf source-file)))

;;;###autoload
(defun ediff-patch-buffer (&optional arg patch-buf)
  "Run Ediff by patching BUFFER-NAME.
Without prefix argument: asks if the patch is in some buffer and prompts for
the buffer or a file, depending on the answer.
With prefix arg=1: assumes the patch is in a file and prompts for the file.
With prefix arg=2: assumes the patch is in a buffer and prompts for the buffer."
  (interactive "P")
  (require 'ediff-ptch)
  (setq patch-buf
	(ediff-get-patch-buffer
	 (if arg (prefix-numeric-value arg)) patch-buf))
  (ediff-patch-buffer-internal
   patch-buf
   (read-buffer
    "Which buffer to patch? "
    (current-buffer))))


;;;###autoload
(defalias 'epatch 'ediff-patch-file)
;;;###autoload
(defalias 'epatch-buffer 'ediff-patch-buffer)




;;; Versions Control functions

;;;###autoload
(defun ediff-revision (&optional file startup-hooks)
  "Run Ediff by comparing versions of a file.
The file is an optional FILE argument or the file entered at the prompt.
Default: the file visited by the current buffer.
Uses `vc.el' or `rcs.el' depending on `ediff-version-control-package'."
  ;; if buffer is non-nil, use that buffer instead of the current buffer
  (interactive "P")
  (if (not (stringp file))
    (setq file
	  (ediff-read-file-name "Compare revisions for file"
				(if ediff-use-last-dir
				    ediff-last-dir-A
				  default-directory)
				(ediff-get-default-file-name)
				'no-dirs)))
  (find-file file)
  (if (and (buffer-modified-p)
	   (y-or-n-p (message "Buffer %s is modified. Save buffer? "
			      (buffer-name))))
      (save-buffer (current-buffer)))
  (let (rev1 rev2)
    (setq rev1
	  (read-string
	   (format "Revision 1 to compare (default: %s's latest revision): "
		   (file-name-nondirectory file)))
	  rev2
	  (read-string
	   (format "Revision 2 to compare (default: %s's current state): "
		   (file-name-nondirectory file))))
    (ediff-load-version-control)
    (funcall
     (intern (format "ediff-%S-internal" ediff-version-control-package))
     rev1 rev2 startup-hooks)
    ))


;;;###autoload
(defalias 'erevision 'ediff-revision)


;; Test if version control package is loaded and load if not
;; Is SILENT is non-nil, don't report error if package is not found.
(defun ediff-load-version-control (&optional silent)
  (require 'ediff-vers)
  (or (featurep ediff-version-control-package)
      (if (locate-library (symbol-name ediff-version-control-package))
	  (progn
	    (message "") ; kill the message from `locate-library'
	    (require ediff-version-control-package))
	(or silent
	    (error "Version control package %S.el not found.  Use vc.el instead"
		   ediff-version-control-package)))))


;;;###autoload
(defun ediff-version ()
  "Return string describing the version of Ediff.
When called interactively, displays the version."
  (interactive)
  (if (interactive-p)
      (message (ediff-version))
    (format "Ediff %s of %s" ediff-version ediff-date)))


;;;###autoload
(defun ediff-documentation (&optional node)
  "Display Ediff's manual.
With optional NODE, goes to that node."
  (interactive)
  (let ((ctl-window ediff-control-window)
	(ctl-buf ediff-control-buffer))

    (ediff-skip-unsuitable-frames)
    (condition-case nil
	(progn
	  (pop-to-buffer (get-buffer-create "*info*"))
	  (info (if ediff-xemacs-p "ediff.info" "ediff"))
	  (if node
	      (Info-goto-node node)
	    (message "Type `i' to search for a specific topic"))
	  (raise-frame (selected-frame)))
      (error (beep 1)
	     (with-output-to-temp-buffer ediff-msg-buffer
	       (ediff-with-current-buffer standard-output
		 (fundamental-mode))
	       (princ ediff-BAD-INFO))
	     (if (window-live-p ctl-window)
		 (progn
		   (select-window ctl-window)
		   (set-window-buffer ctl-window ctl-buf)))))))




;;; Local Variables:
;;; eval: (put 'ediff-defvar-local 'lisp-indent-hook 'defun)
;;; eval: (put 'ediff-with-current-buffer 'lisp-indent-hook 1)
;;; eval: (put 'ediff-with-current-buffer 'edebug-form-spec '(form body))
;;; End:

(require 'ediff-util)

(run-hooks 'ediff-load-hook)

;;; ediff.el ends here
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.