emacs / lisp / dired.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
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
;;; dired.el --- directory-browsing commands

;; Copyright (C) 1985, 86, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.

;; Author: Sebastian Kremer <sk@thp.uni-koeln.de>
;; Maintainer: FSF

;; 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:

;; This is a major mode for directory browsing and editing.  It is
;; documented in the Emacs manual.

;; Rewritten in 1990/1991 to add tree features, file marking and
;; sorting by Sebastian Kremer <sk@thp.uni-koeln.de>.
;; Finished up by rms in 1992.

;;; Code:

;;; Customizable variables

;;;###autoload
(defvar dired-listing-switches "-al"
  "*Switches passed to `ls' for dired.  MUST contain the `l' option.
May contain all other options that don't contradict `-l';
may contain even `F', `b', `i' and `s'.  See also the variable
`dired-ls-F-marks-symlinks' concerning the `F' switch.")

; Don't use absolute paths as /bin should be in any PATH and people
; may prefer /usr/local/gnu/bin or whatever.  However, chown is
; usually not in PATH.

;;;###autoload
(defvar dired-chown-program
  (if (memq system-type '(hpux dgux usg-unix-v irix linux gnu/linux))
      "chown"
    (if (file-exists-p "/usr/sbin/chown")
	"/usr/sbin/chown"
      "/etc/chown"))
  "Name of chown command (usually `chown' or `/etc/chown').")

(defvar dired-chmod-program
  (if (eq system-type 'windows-nt)
      "chmode" "chmod")
  "Name of chmod command (usually `chmod' or `chmode').")

;;;###autoload
(defvar dired-ls-F-marks-symlinks nil
  "*Informs dired about how `ls -lF' marks symbolic links.
Set this to t if `ls' (or whatever program is specified by
`insert-directory-program') with `-lF' marks the symbolic link
itself with a trailing @ (usually the case under Ultrix).

Example: if `ln -s foo bar; ls -F bar' gives `bar -> foo', set it to
nil (the default), if it gives `bar@ -> foo', set it to t.

Dired checks if there is really a @ appended.  Thus, if you have a
marking `ls' program on one host and a non-marking on another host, and
don't care about symbolic links which really end in a @, you can
always set this variable to t.")

;;;###autoload
(defvar dired-trivial-filenames "^\\.\\.?$\\|^#"
  "*Regexp of files to skip when finding first file of a directory.
A value of nil means move to the subdir line.
A value of t means move to first file.")

;;;###autoload
(defvar dired-keep-marker-rename t
  ;; Use t as default so that moved files "take their markers with them".
  "*Controls marking of renamed files.
If t, files keep their previous marks when they are renamed.
If a character, renamed files (whether previously marked or not)
are afterward marked with that character.")

;;;###autoload
(defvar dired-keep-marker-copy ?C
  "*Controls marking of copied files.
If t, copied files are marked if and as the corresponding original files were.
If a character, copied files are unconditionally marked with that character.")

;;;###autoload
(defvar dired-keep-marker-hardlink ?H
  "*Controls marking of newly made hard links.
If t, they are marked if and as the files linked to were marked.
If a character, new links are unconditionally marked with that character.")

;;;###autoload
(defvar dired-keep-marker-symlink ?Y
  "*Controls marking of newly made symbolic links.
If t, they are marked if and as the files linked to were marked.
If a character, new links are unconditionally marked with that character.")

;;;###autoload
(defvar dired-dwim-target nil
  "*If non-nil, dired tries to guess a default target directory.
This means: if there is a dired buffer displayed in the next window,
use its current subdir, instead of the current subdir of this dired buffer.

The target is used in the prompt for file copy, rename etc.")

;;;###autoload
(defvar dired-copy-preserve-time t
  "*If non-nil, Dired preserves the last-modified time in a file copy.
\(This works on only some systems.)")

;;; Hook variables

(defvar dired-load-hook nil
  "Run after loading dired.
You can customize key bindings or load extensions with this.")

(defvar dired-mode-hook nil
  "Run at the very end of dired-mode.")

(defvar dired-before-readin-hook nil
  "This hook is run before a dired buffer is read in (created or reverted).")

(defvar dired-after-readin-hook nil
  "Hook run after each time a file or directory is read by Dired.
After each listing of a file or directory, this hook is run
with the buffer narrowed to the listing.")
;; Note this can't simply be run inside function `dired-ls' as the hook
;; functions probably depend on the dired-subdir-alist to be OK.

;;; Internal variables

(defvar dired-marker-char ?*		; the answer is 42
  ;; so that you can write things like
  ;; (let ((dired-marker-char ?X))
  ;;    ;; great code using X markers ...
  ;;    )
  ;; For example, commands operating on two sets of files, A and B.
  ;; Or marking files with digits 0-9.  This could implicate
  ;; concentric sets or an order for the marked files.
  ;; The code depends on dynamic scoping on the marker char.
  "In Dired, the current mark character.
This is what the `do' commands look for and what the `mark' commands store.")

(defvar dired-del-marker ?D
  "Character used to flag files for deletion.")

(defvar dired-shrink-to-fit
  t
;; I see no reason ever to make this nil -- rms.
;;  (> baud-rate search-slow-speed)
  "Non-nil means Dired shrinks the display buffer to fit the marked files.")

(defvar dired-flagging-regexp nil);; Last regexp used to flag files.

(defvar dired-file-version-alist)

(defvar dired-directory nil
  "The directory name or shell wildcard that was used as argument to `ls'.
Local to each dired buffer.  May be a list, in which case the car is the
directory name and the cdr is the actual files to list.")

(defvar dired-actual-switches nil
  "The value of `dired-listing-switches' used to make this buffer's text.")

(defvar dired-re-inode-size "[0-9 \t]*"
  "Regexp for optional initial inode and file size as made by `ls -i -s'.")

;; These regexps must be tested at beginning-of-line, but are also
;; used to search for next matches, so neither omitting "^" nor
;; replacing "^" by "\n" (to make it slightly faster) will work.

(defvar dired-re-mark "^[^ \n]")
;; "Regexp matching a marked line.
;; Important: the match ends just after the marker."
(defvar dired-re-maybe-mark "^. ")
(defvar dired-re-dir (concat dired-re-maybe-mark dired-re-inode-size "d"))
(defvar dired-re-sym (concat dired-re-maybe-mark dired-re-inode-size "l"))
(defvar dired-re-exe;; match ls permission string of an executable file
  (mapconcat (function
	      (lambda (x)
		(concat dired-re-maybe-mark dired-re-inode-size x)))
	     '("-[-r][-w][xs][-r][-w].[-r][-w]."
	       "-[-r][-w].[-r][-w][xs][-r][-w]."
	       "-[-r][-w].[-r][-w].[-r][-w][xst]")
	     "\\|"))
(defvar dired-re-perms "[-bcdlps][-r][-w].[-r][-w].[-r][-w].")
(defvar dired-re-dot "^.* \\.\\.?$")

;; The subdirectory names in this list are expanded.
(defvar dired-subdir-alist nil
  "Association list of subdirectories and their buffer positions.
Each subdirectory has an element: (DIRNAME . STARTMARKER).
The order of elements is the reverse of the order in the buffer.
In simple cases, this list contains one element.")

(defvar dired-subdir-regexp "^. \\([^\n\r]+\\)\\(:\\)[\n\r]"
  "Regexp matching a maybe hidden subdirectory line in `ls -lR' output.
Subexpression 1 is the subdirectory proper, no trailing colon.
The match starts at the beginning of the line and ends after the end
of the line (\\n or \\r).
Subexpression 2 must end right before the \\n or \\r.")

(defvar dired-font-lock-keywords
  (list
   ;;
   ;; Directory headers.
   (list dired-subdir-regexp '(1 font-lock-type-face))
   ;;
   ;; We make heavy use of MATCH-ANCHORED, since the regexps don't identify the
   ;; file name itself.  We search for Dired defined regexps, and then use the
   ;; Dired defined function `dired-move-to-filename' before searching for the
   ;; simple regexp ".+".  It is that regexp which matches the file name.
   ;;
   ;; Dired marks.
   (list dired-re-mark
	 '(0 font-lock-reference-face)
	 '(".+" (dired-move-to-filename) nil (0 font-lock-warning-face)))
   ;;
   ;; Files that are group or world writable.
   (list (concat dired-re-maybe-mark dired-re-inode-size
		 "\\([-d]\\(....w....\\|.......w.\\)\\)")
	 '(1 font-lock-comment-face)
	 '(".+" (dired-move-to-filename) nil (0 font-lock-comment-face)))
   ;;
   ;; Subdirectories.
   (list dired-re-dir
	 '(".+" (dired-move-to-filename) nil (0 font-lock-function-name-face)))
   ;;
   ;; Symbolic links.
   (list dired-re-sym 
	 '(".+" (dired-move-to-filename) nil (0 font-lock-keyword-face)))
   ;;
   ;; Files suffixed with `completion-ignored-extensions'.
   '(eval .
     (let ((extensions (mapcar 'regexp-quote completion-ignored-extensions)))
       ;; It is quicker to first find just an extension, then go back to the
       ;; start of that file name.  So we do this complex MATCH-ANCHORED form.
       (list (concat "\\(" (mapconcat 'identity extensions "\\|") "\\|#\\)$")
	     '(".+" (dired-move-to-filename) nil (0 font-lock-string-face))))))
  "Additional expressions to highlight in Dired mode.")

;;; Macros must be defined before they are used, for the byte compiler.

;; Mark all files for which CONDITION evals to non-nil.
;; CONDITION is evaluated on each line, with point at beginning of line.
;; MSG is a noun phrase for the type of files being marked.
;; It should end with a noun that can be pluralized by adding `s'.
;; Return value is the number of files marked, or nil if none were marked.
(defmacro dired-mark-if (predicate msg)
  (` (let (buffer-read-only count)
       (save-excursion
	 (setq count 0)
	 (if (, msg) (message "Marking %ss..." (, msg)))
	 (goto-char (point-min))
	 (while (not (eobp))
	   (if (, predicate)
	       (progn
		 (delete-char 1)
		 (insert dired-marker-char)
		 (setq count (1+ count))))
	   (forward-line 1))
	 (if (, msg) (message "%s %s%s %s%s."
			  count
			  (, msg)
			  (dired-plural-s count)
			  (if (eq dired-marker-char ?\040) "un" "")
			  (if (eq dired-marker-char dired-del-marker)
			      "flagged" "marked"))))
       (and (> count 0) count))))

(defmacro dired-map-over-marks (body arg &optional show-progress)
;;  "Macro: Perform BODY with point somewhere on each marked line
;;and return a list of BODY's results.
;;If no marked file could be found, execute BODY on the current line.
;;  If ARG is an integer, use the next ARG (or previous -ARG, if ARG<0)
;;  files instead of the marked files.
;;  In that case point is dragged along.  This is so that commands on
;;  the next ARG (instead of the marked) files can be chained easily.
;;  If ARG is otherwise non-nil, use current file instead.
;;If optional third arg SHOW-PROGRESS evaluates to non-nil,
;;   redisplay the dired buffer after each file is processed.
;;No guarantee is made about the position on the marked line.
;;  BODY must ensure this itself if it depends on this.
;;Search starts at the beginning of the buffer, thus the car of the list
;;  corresponds to the line nearest to the buffer's bottom.  This
;;  is also true for (positive and negative) integer values of ARG.
;;BODY should not be too long as it is expanded four times."
;;
;;Warning: BODY must not add new lines before point - this may cause an
;;endless loop.
;;This warning should not apply any longer, sk  2-Sep-1991 14:10.
  (` (prog1
	 (let (buffer-read-only case-fold-search found results)
	   (if (, arg)
	       (if (integerp (, arg))
		   (progn;; no save-excursion, want to move point.
		     (dired-repeat-over-lines
		      (, arg)
		      (function (lambda ()
				  (if (, show-progress) (sit-for 0))
				  (setq results (cons (, body) results)))))
		     (if (< (, arg) 0)
			 (nreverse results)
		       results))
		 ;; non-nil, non-integer ARG means use current file:
		 (list (, body)))
	     (let ((regexp (dired-marker-regexp)) next-position)
	       (save-excursion
		 (goto-char (point-min))
		 ;; remember position of next marked file before BODY
		 ;; can insert lines before the just found file,
		 ;; confusing us by finding the same marked file again
		 ;; and again and...
		 (setq next-position (and (re-search-forward regexp nil t)
					  (point-marker))
		       found (not (null next-position)))
		 (while next-position
		   (goto-char next-position)
		   (if (, show-progress) (sit-for 0))
		   (setq results (cons (, body) results))
		   ;; move after last match
		   (goto-char next-position)
		   (forward-line 1)
		   (set-marker next-position nil)
		   (setq next-position (and (re-search-forward regexp nil t)
					    (point-marker)))))
	       (if found
		   results
		 (list (, body))))))
       ;; save-excursion loses, again
       (dired-move-to-filename))))

(defun dired-get-marked-files (&optional localp arg)
  "Return the marked files' names as list of strings.
The list is in the same order as the buffer, that is, the car is the
  first marked file.
Values returned are normally absolute pathnames.
Optional arg LOCALP as in `dired-get-filename'.
Optional second argument ARG forces to use other files.  If ARG is an
  integer, use the next ARG files.  If ARG is otherwise non-nil, use
  current file.  Usually ARG comes from the current prefix arg."
  (save-excursion
    (nreverse (dired-map-over-marks (dired-get-filename localp) arg))))


;; Function dired-ls is redefinable for VMS, ange-ftp, Prospero or
;; other special applications.

;; The dired command

(defun dired-read-dir-and-switches (str)
  ;; For use in interactive.
  (reverse (list
	    (if current-prefix-arg
		(read-string "Dired listing switches: "
			     dired-listing-switches))
	    (read-file-name (format "Dired %s(directory): " str)
			    nil default-directory nil))))

;;;###autoload (define-key ctl-x-map "d" 'dired)
;;;###autoload
(defun dired (dirname &optional switches)
  "\"Edit\" directory DIRNAME--delete, rename, print, etc. some files in it.
Optional second argument SWITCHES specifies the `ls' options used.
\(Interactively, use a prefix argument to be able to specify SWITCHES.)
Dired displays a list of files in DIRNAME (which may also have
shell wildcards appended to select certain files).  If DIRNAME is a cons,
its first element is taken as the directory name and the rest as an explicit
list of files to make directory entries for.
\\<dired-mode-map>\
You can move around in it with the usual commands.
You can flag files for deletion with \\[dired-flag-file-deletion] and then
delete them by typing \\[dired-do-flagged-delete].
Type \\[describe-mode] after entering dired for more info.

If DIRNAME is already in a dired buffer, that buffer is used without refresh."
  ;; Cannot use (interactive "D") because of wildcards.
  (interactive (dired-read-dir-and-switches ""))
  (switch-to-buffer (dired-noselect dirname switches)))

;;;###autoload (define-key ctl-x-4-map "d" 'dired-other-window)
;;;###autoload
(defun dired-other-window (dirname &optional switches)
  "\"Edit\" directory DIRNAME.  Like `dired' but selects in another window."
  (interactive (dired-read-dir-and-switches "in other window "))
  (switch-to-buffer-other-window (dired-noselect dirname switches)))

;;;###autoload (define-key ctl-x-5-map "d" 'dired-other-frame)
;;;###autoload
(defun dired-other-frame (dirname &optional switches)
  "\"Edit\" directory DIRNAME.  Like `dired' but makes a new frame."
  (interactive (dired-read-dir-and-switches "in other frame "))
  (switch-to-buffer-other-frame (dired-noselect dirname switches)))

;;;###autoload
(defun dired-noselect (dir-or-list &optional switches)
  "Like `dired' but returns the dired buffer as value, does not select it."
  (or dir-or-list (setq dir-or-list default-directory))
  ;; This loses the distinction between "/foo/*/" and "/foo/*" that
  ;; some shells make:
  (let (dirname)
    (if (consp dir-or-list)
	(setq dirname (car dir-or-list))
      (setq dirname dir-or-list))
    (setq dirname (abbreviate-file-name
		   (expand-file-name (directory-file-name dirname))))
    (if find-file-visit-truename
	(setq dirname (file-truename dirname)))
    (if (file-directory-p dirname)
	(setq dirname (file-name-as-directory dirname)))
    (if (consp dir-or-list)
	(setq dir-or-list (cons dirname (cdr dir-or-list)))
      (setq dir-or-list dirname))
    (dired-internal-noselect dir-or-list switches)))

;; Separate function from dired-noselect for the sake of dired-vms.el.
(defun dired-internal-noselect (dir-or-list &optional switches mode)
  ;; If there is an existing dired buffer for DIRNAME, just leave
  ;; buffer as it is (don't even call dired-revert).
  ;; This saves time especially for deep trees or with ange-ftp.
  ;; The user can type `g'easily, and it is more consistent with find-file.
  ;; But if SWITCHES are given they are probably different from the
  ;; buffer's old value, so call dired-sort-other, which does
  ;; revert the buffer.
  ;; A pity we can't possibly do "Directory has changed - refresh? "
  ;; like find-file does.
  ;; Optional argument MODE is passed to dired-find-buffer-nocreate,
  ;; see there.
  (let* ((dirname (if (consp dir-or-list) (car dir-or-list) dir-or-list))
	 ;; The following line used to use dir-or-list.
	 ;; That never found an existing buffer, in the case
	 ;; where it is a list.
	 (buffer (dired-find-buffer-nocreate dirname mode))
	 ;; note that buffer already is in dired-mode, if found
	 (new-buffer-p (not buffer))
	 (old-buf (current-buffer)))
    (or buffer
	(let ((default-major-mode 'fundamental-mode))
	  ;; We don't want default-major-mode to run hooks and set auto-fill
	  ;; or whatever, now that dired-mode does not
	  ;; kill-all-local-variables any longer.
	  (setq buffer (create-file-buffer (directory-file-name dirname)))))
    (set-buffer buffer)
    (if (not new-buffer-p)     ; existing buffer ...
	(cond (switches        ; ... but new switches     
	       ;; file list may have changed
	       (if (consp dir-or-list) 
		   (setq dired-directory dir-or-list))
	       ;; this calls dired-revert
	       (dired-sort-other switches))  
	      ;; If directory has changed on disk, offer to revert.
	      ((if (let ((attributes (file-attributes dirname))
			 (modtime (visited-file-modtime)))
		     (or (eq modtime 0)
			 (not (eq (car attributes) t))
			 (and (= (car (nth 5 attributes)) (car modtime))
			      (= (nth 1 (nth 5 attributes)) (cdr modtime)))))
		   nil
		 (message "%s"
			  (substitute-command-keys
			   "Directory has changed on disk; type \\[revert-buffer] to update Dired")))))
      ;; Else a new buffer
      (setq default-directory
	    (if (file-directory-p dirname)
		dirname
	      (file-name-directory dirname)))
      (or switches (setq switches dired-listing-switches))
      (dired-mode dirname switches)
      (if mode (funcall mode))
      ;; default-directory and dired-actual-switches are set now
      ;; (buffer-local), so we can call dired-readin:
      (let ((failed t))
	(unwind-protect
	    (progn (dired-readin dir-or-list buffer)
		   (setq failed nil))
	  ;; dired-readin can fail if parent directories are inaccessible.
	  ;; Don't leave an empty buffer around in that case.
	  (if failed (kill-buffer buffer))))
      ;; No need to narrow since the whole buffer contains just
      ;; dired-readin's output, nothing else.  The hook can
      ;; successfully use dired functions (e.g. dired-get-filename)
      ;; as the subdir-alist has been built in dired-readin.
      (run-hooks 'dired-after-readin-hook)
      (goto-char (point-min))
      (dired-initial-position dirname))
    (set-buffer old-buf)
    buffer))

(defun dired-find-buffer-nocreate (dirname &optional mode)
  ;; This differs from dired-buffers-for-dir in that it does not consider
  ;; subdirs of default-directory and searches for the first match only.
  ;; Also, the major mode must be MODE.
  (let (found (blist dired-buffers))    ; was (buffer-list)
    (or mode (setq mode 'dired-mode))
    (while blist
      (if (null (buffer-name (cdr (car blist))))
	  (setq blist (cdr blist))
	(save-excursion
	  (set-buffer (cdr (car blist)))
	  (if (and (eq major-mode mode)
		   (if (consp dired-directory)
		       (equal (car dired-directory) dirname)
		     (equal dired-directory dirname)))
	      (setq found (cdr (car blist))
		    blist nil)
	    (setq blist (cdr blist))))))
    found))


;; Read in a new dired buffer

;; dired-readin differs from dired-insert-subdir in that it accepts
;; wildcards, erases the buffer, and builds the subdir-alist anew
;; (including making it buffer-local and clearing it first).
(defun dired-readin (dir-or-list buffer)
  ;; default-directory and dired-actual-switches must be buffer-local
  ;; and initialized by now.
  ;; Thus we can test (equal default-directory dirname) instead of
  ;; (file-directory-p dirname) and save a filesystem transaction.
  ;; Also, we can run this hook which may want to modify the switches
  ;; based on default-directory, e.g. with ange-ftp to a SysV host
  ;; where ls won't understand -Al switches.
  (let (dirname)
    (if (consp dir-or-list)
	(setq dirname (car dir-or-list))
      (setq dirname dir-or-list))
    (setq dirname (expand-file-name dirname))
    (if (consp dir-or-list)
	(setq dir-or-list (cons dirname (cdr dir-or-list))))
    (run-hooks 'dired-before-readin-hook)
    (save-excursion
      (message "Reading directory %s..." dirname)
      (set-buffer buffer)
      (let (buffer-read-only (failed t))
	(widen)
	(erase-buffer)
	(dired-readin-insert dir-or-list)
	(indent-rigidly (point-min) (point-max) 2)
	;; We need this to make the root dir have a header line as all
	;; other subdirs have:
	(goto-char (point-min))
	(dired-insert-headerline default-directory)
	;; can't run dired-after-readin-hook here, it may depend on the subdir
	;; alist to be OK.
	)
      (message "Reading directory %s...done" dirname)
      ;; Must first make alist buffer local and set it to nil because
      ;; dired-build-subdir-alist will call dired-clear-alist first
      (set (make-local-variable 'dired-subdir-alist) nil)
      (dired-build-subdir-alist)
      (let ((attributes (file-attributes dirname)))
	(if (eq (car attributes) t)
	    (set-visited-file-modtime (nth 5 attributes))))
      (set-buffer-modified-p nil))))

;; Subroutines of dired-readin

(defun dired-readin-insert (dir-or-list)
  ;; Just insert listing for the passed-in directory or
  ;; directory-and-file list, assuming a clean buffer.
  (let (dirname)
    (if (consp dir-or-list)
	(setq dirname (car dir-or-list))
      (setq dirname dir-or-list))
    ;; Expand before comparing in case one or both have been abbreviated.
    (if (and (equal (expand-file-name default-directory)
		    (expand-file-name dirname))
	     (not (consp dir-or-list)))
	;; If we are reading a whole single directory...
	(dired-insert-directory dir-or-list dired-actual-switches nil t)
      (if (not (file-readable-p
		(directory-file-name (file-name-directory dirname))))
	  (error "Directory %s inaccessible or nonexistent" dirname)
	;; Else assume it contains wildcards,
	;; unless it is an explicit list of files.
	(dired-insert-directory dir-or-list dired-actual-switches
				(not (listp dir-or-list)))
	(save-excursion		;; insert wildcard instead of total line:
	  (goto-char (point-min))
	  (insert "wildcard " (file-name-nondirectory dirname) "\n"))))))

(defun dired-insert-directory (dir-or-list switches &optional wildcard full-p)
  ;; Do the right thing whether dir-or-list is atomic or not.  If it is,
  ;; inset all files listed in the cdr (the car is the passed-in directory
  ;; list).
  (let ((opoint (point))
	(process-environment (copy-sequence process-environment))
	end)
    ;; This makes sure that month names come out in English
    ;; so we can find the start of the file name.
    ;; But if the user has customized the way of finding the file name,
    ;; this is not necessary.
    (if (and (equal dired-move-to-filename-regexp
		    dired-standard-move-to-filename-regexp)
	     ;; It also isn't necessary if we'd use the C locale anyway.
	     (not (equal (or (getenv "LC_ALL") (getenv "LC_TIME")
			     (getenv "LANGUAGE") (getenv "LANG") "C")
			 "C")))
	(setq process-environment (cons "LC_ALL=C" process-environment)))
    (if (consp dir-or-list)
	;; In this case, use the file names in the cdr
	;; exactly as originally given to dired-noselect.
	(mapcar
	 (function (lambda (x) (insert-directory x switches wildcard full-p)))
	 (cdr dir-or-list))
      ;; Expand the file name here because it may have been abbreviated
      ;; in dired-noselect.
      (insert-directory (expand-file-name dir-or-list) switches wildcard full-p))
    ;; Quote certain characters, unless ls quoted them for us.
    (if (not (string-match "b" dired-actual-switches))
	(save-excursion
	  (setq end (point-marker))
	  (goto-char opoint)
	  (while (search-forward "\\" end t)
	    (replace-match "\\\\" nil t))
	  (goto-char opoint)
	  (while (search-forward "\^m" end t)
	    (replace-match "\\015" nil t))
	  (set-marker end nil)))
    (dired-insert-set-properties opoint (point)))
  (setq dired-directory dir-or-list))

;; Make the file names highlight when the mouse is on them.
(defun dired-insert-set-properties (beg end)
  (save-excursion
    (goto-char beg)
    (while (< (point) end)
      (condition-case nil
	  (if (dired-move-to-filename)
	      (put-text-property (point)
				 (save-excursion
				   (dired-move-to-end-of-filename)
				   (point))
				 'mouse-face 'highlight))
	(error nil))
      (forward-line 1))))

(defun dired-insert-headerline (dir);; also used by dired-insert-subdir
  ;; Insert DIR's headerline with no trailing slash, exactly like ls
  ;; would, and put cursor where dired-build-subdir-alist puts subdir
  ;; boundaries.
  (save-excursion (insert "  " (directory-file-name dir) ":\n")))


;; Reverting a dired buffer

(defun dired-revert (&optional arg noconfirm)
  ;; Reread the dired buffer.  Must also be called after
  ;; dired-actual-switches have changed.
  ;; Should not fail even on completely garbaged buffers.
  ;; Preserves old cursor, marks/flags, hidden-p.
  (widen)				; just in case user narrowed
  (let ((opoint (point))
	(ofile (dired-get-filename nil t))
	(mark-alist nil)		; save marked files
	(hidden-subdirs (dired-remember-hidden))
	(old-subdir-alist (cdr (reverse dired-subdir-alist))) ; except pwd
	(case-fold-search nil)		; we check for upper case ls flags
	buffer-read-only)
    (goto-char (point-min))
    (setq mark-alist;; only after dired-remember-hidden since this unhides:
	  (dired-remember-marks (point-min) (point-max)))
    ;; treat top level dir extra (it may contain wildcards)
    (dired-uncache
     (if (consp dired-directory) (car dired-directory) dired-directory))
    (dired-readin dired-directory (current-buffer))
    (let ((dired-after-readin-hook nil))
      ;; don't run that hook for each subdir...
      (dired-insert-old-subdirs old-subdir-alist))
    (dired-mark-remembered mark-alist)	; mark files that were marked
    ;; ... run the hook for the whole buffer, and only after markers
    ;; have been reinserted (else omitting in dired-x would omit marked files)
    (run-hooks 'dired-after-readin-hook)	; no need to narrow
    (or (and ofile (dired-goto-file ofile)) ; move cursor to where it
	(goto-char opoint))		; was before
    (dired-move-to-filename)
    (save-excursion			; hide subdirs that were hidden
      (mapcar (function (lambda (dir)
			  (if (dired-goto-subdir dir)
			      (dired-hide-subdir 1))))
	      hidden-subdirs)))
  ;; outside of the let scope
;;; Might as well not override the user if the user changed this.
;;;  (setq buffer-read-only t)
  )

;; Subroutines of dired-revert
;; Some of these are also used when inserting subdirs.

(defun dired-remember-marks (beg end)
  ;; Return alist of files and their marks, from BEG to END.
  (if selective-display			; must unhide to make this work.
      (let (buffer-read-only)
	(subst-char-in-region beg end ?\r ?\n)))
  (let (fil chr alist)
    (save-excursion
      (goto-char beg)
      (while (re-search-forward dired-re-mark end t)
	(if (setq fil (dired-get-filename nil t))
	    (setq chr (preceding-char)
		  alist (cons (cons fil chr) alist)))))
    alist))

;; Mark all files remembered in ALIST.
;; Each element of ALIST looks like (FILE . MARKERCHAR).
(defun dired-mark-remembered (alist)
  (let (elt fil chr)
    (while alist
      (setq elt (car alist)
	    alist (cdr alist)
	    fil (car elt)
	    chr (cdr elt))
      (if (dired-goto-file fil)
	  (save-excursion
	    (beginning-of-line)
	    (delete-char 1)
	    (insert chr))))))

;; Return a list of names of subdirs currently hidden.
(defun dired-remember-hidden ()
  (let ((l dired-subdir-alist) dir pos result)
    (while l
      (setq dir (car (car l))
	    pos (cdr (car l))
	    l (cdr l))
      (goto-char pos)
      (skip-chars-forward "^\r\n")
      (if (eq (following-char) ?\r)
	  (setq result (cons dir result))))
    result))

;; Try to insert all subdirs that were displayed before,
;; according to the former subdir alist OLD-SUBDIR-ALIST.
(defun dired-insert-old-subdirs (old-subdir-alist)
  (or (string-match "R" dired-actual-switches)
      (let (elt dir)
	(while old-subdir-alist
	  (setq elt (car old-subdir-alist)
		old-subdir-alist (cdr old-subdir-alist)
		dir (car elt))
	  (condition-case ()
	      (progn
		(dired-uncache dir)
		(dired-insert-subdir dir))
	    (error nil))))))

;; Remove directory DIR from any directory cache.
(defun dired-uncache (dir)
  (let ((handler (find-file-name-handler dir 'dired-uncache)))
    (if handler
	(funcall handler 'dired-uncache dir))))

;; dired mode key bindings and initialization

(defvar dired-mode-map nil "Local keymap for dired-mode buffers.")
(if dired-mode-map
    nil
  ;; This looks ugly when substitute-command-keys uses C-d instead d:
  ;;  (define-key dired-mode-map "\C-d" 'dired-flag-file-deletion)

  (let ((map (make-keymap)))
    (suppress-keymap map)
    (define-key map [mouse-2] 'dired-mouse-find-file-other-window)
    ;; Commands to mark or flag certain categories of files
    (define-key map "#" 'dired-flag-auto-save-files)
    (define-key map "." 'dired-clean-directory)
    (define-key map "~" 'dired-flag-backup-files)
    ;; Upper case keys (except !) for operating on the marked files
    (define-key map "A" 'dired-do-search)
    (define-key map "C" 'dired-do-copy)
    (define-key map "B" 'dired-do-byte-compile)
    (define-key map "D" 'dired-do-delete)
    (define-key map "G" 'dired-do-chgrp)
    (define-key map "H" 'dired-do-hardlink)
    (define-key map "L" 'dired-do-load)
    (define-key map "M" 'dired-do-chmod)
    (define-key map "O" 'dired-do-chown)
    (define-key map "P" 'dired-do-print)
    (define-key map "Q" 'dired-do-query-replace)
    (define-key map "R" 'dired-do-rename)
    (define-key map "S" 'dired-do-symlink)
    (define-key map "X" 'dired-do-shell-command)
    (define-key map "Z" 'dired-do-compress)
    (define-key map "!" 'dired-do-shell-command)
    ;; Comparison commands
    (define-key map "=" 'dired-diff)
    (define-key map "\M-=" 'dired-backup-diff)
    ;; Tree Dired commands
    (define-key map "\M-\C-?" 'dired-unmark-all-files)
    (define-key map "\M-\C-d" 'dired-tree-down)
    (define-key map "\M-\C-u" 'dired-tree-up)
    (define-key map "\M-\C-n" 'dired-next-subdir)
    (define-key map "\M-\C-p" 'dired-prev-subdir)
    ;; move to marked files
    (define-key map "\M-{" 'dired-prev-marked-file)
    (define-key map "\M-}" 'dired-next-marked-file)
    ;; Make all regexp commands share a `%' prefix:
    ;; We used to get to the submap via a symbol dired-regexp-prefix,
    ;; but that seems to serve little purpose, and copy-keymap
    ;; does a better job without it.
    (define-key map "%" nil)
    (define-key map "%u" 'dired-upcase)
    (define-key map "%l" 'dired-downcase)
    (define-key map "%d" 'dired-flag-files-regexp)
    (define-key map "%m" 'dired-mark-files-regexp)
    (define-key map "%r" 'dired-do-rename-regexp)
    (define-key map "%C" 'dired-do-copy-regexp)
    (define-key map "%H" 'dired-do-hardlink-regexp)
    (define-key map "%R" 'dired-do-rename-regexp)
    (define-key map "%S" 'dired-do-symlink-regexp)
    ;; Commands for marking and unmarking.
    (define-key map "*" nil)
    (define-key map "**" 'dired-mark-executables)
    (define-key map "*/" 'dired-mark-directories)
    (define-key map "*@" 'dired-mark-symlinks)
    (define-key map "*%" 'dired-mark-files-regexp)
    (define-key map "*c" 'dired-change-marks)
    (define-key map "*s" 'dired-mark-subdir-files)
    (define-key map "*m" 'dired-mark)
    (define-key map "*u" 'dired-unmark)
    (define-key map "*?" 'dired-unmark-all-files)
    (define-key map "*!" 'dired-unmark-all-files-no-query)
    (define-key map "*\177" 'dired-unmark-backward)
    (define-key map "*\C-n" 'dired-next-marked-file)
    (define-key map "*\C-p" 'dired-prev-marked-file)
    ;; Lower keys for commands not operating on all the marked files
    (define-key map "d" 'dired-flag-file-deletion)
    (define-key map "e" 'dired-find-file)
    (define-key map "f" 'dired-find-file)
    (define-key map "\C-m" 'dired-advertised-find-file)
    (define-key map "g" 'revert-buffer)
    (define-key map "h" 'describe-mode)
    (define-key map "i" 'dired-maybe-insert-subdir)
    (define-key map "k" 'dired-do-kill-lines)
    (define-key map "l" 'dired-do-redisplay)
    (define-key map "m" 'dired-mark)
    (define-key map "n" 'dired-next-line)
    (define-key map "o" 'dired-find-file-other-window)
    (define-key map "\C-o" 'dired-display-file)
    (define-key map "p" 'dired-previous-line)
    (define-key map "q" 'dired-quit)
    (define-key map "s" 'dired-sort-toggle-or-edit)
    (define-key map "u" 'dired-unmark)
    (define-key map "v" 'dired-view-file)
    (define-key map "x" 'dired-do-flagged-delete)
    (define-key map "+" 'dired-create-directory)
    ;; moving
    (define-key map "<" 'dired-prev-dirline)
    (define-key map ">" 'dired-next-dirline)
    (define-key map "^" 'dired-up-directory)
    (define-key map " "  'dired-next-line)
    (define-key map "\C-n" 'dired-next-line)
    (define-key map "\C-p" 'dired-previous-line)
    (define-key map [down] 'dired-next-line)
    (define-key map [up] 'dired-previous-line)
    ;; hiding
    (define-key map "$" 'dired-hide-subdir)
    (define-key map "\M-$" 'dired-hide-all)
    ;; misc
    (define-key map "?" 'dired-summary)
    (define-key map "\177" 'dired-unmark-backward)
    (define-key map "\C-_" 'dired-undo)
    (define-key map "\C-xu" 'dired-undo)

    ;; Make menu bar items.

    ;; Get rid of the Edit menu bar item to save space.
    (define-key map [menu-bar edit] 'undefined)

    (define-key map [menu-bar subdir]
      (cons "Subdir" (make-sparse-keymap "Subdir")))

    (define-key map [menu-bar subdir hide-all]
      '("Hide All" . dired-hide-all))
    (define-key map [menu-bar subdir hide-subdir]
      '("Hide Subdir" . dired-hide-subdir))
    (define-key map [menu-bar subdir tree-down]
      '("Tree Down" . dired-tree-down))
    (define-key map [menu-bar subdir tree-up]
      '("Tree Up" . dired-tree-up))
    (define-key map [menu-bar subdir up]
      '("Up Directory" . dired-up-directory))
    (define-key map [menu-bar subdir prev-subdir]
      '("Prev Subdir" . dired-prev-subdir))
    (define-key map [menu-bar subdir next-subdir]
      '("Next Subdir" . dired-next-subdir))
    (define-key map [menu-bar subdir prev-dirline]
      '("Prev Dirline" . dired-prev-dirline))
    (define-key map [menu-bar subdir next-dirline]
      '("Next Dirline" . dired-next-dirline))
    (define-key map [menu-bar subdir insert]
      '("Insert This Subdir" . dired-maybe-insert-subdir))

    (define-key map [menu-bar immediate]
      (cons "Immediate" (make-sparse-keymap "Immediate")))

    (define-key map [menu-bar immediate revert-buffer]
      '("Update Buffer" . revert-buffer))

    (define-key map [menu-bar immediate dashes]
      '("--"))

    (define-key map [menu-bar immediate backup-diff]
      '("Compare with Backup" . dired-backup-diff))
    (define-key map [menu-bar immediate diff]
      '("Diff" . dired-diff))
    (define-key map [menu-bar immediate view]
      '("View This File" . dired-view-file))
    (define-key map [menu-bar immediate display]
      '("Display in Other Window" . dired-display-file))
    (define-key map [menu-bar immediate find-file-other-window]
      '("Find in Other Window" . dired-find-file-other-window))
    (define-key map [menu-bar immediate find-file]
      '("Find This File" . dired-find-file))
    (define-key map [menu-bar immediate create-directory]
      '("Create Directory..." . dired-create-directory))

    (define-key map [menu-bar regexp]
      (cons "Regexp" (make-sparse-keymap "Regexp")))

    (define-key map [menu-bar regexp downcase]
      '("Downcase" . dired-downcase))
    (define-key map [menu-bar regexp upcase]
      '("Upcase" . dired-upcase))
    (define-key map [menu-bar regexp hardlink]
      '("Hardlink..." . dired-do-hardlink-regexp))
    (define-key map [menu-bar regexp symlink]
      '("Symlink..." . dired-do-symlink-regexp))
    (define-key map [menu-bar regexp rename]
      '("Rename..." . dired-do-rename-regexp))
    (define-key map [menu-bar regexp copy]
      '("Copy..." . dired-do-copy-regexp))
    (define-key map [menu-bar regexp flag]
      '("Flag..." . dired-flag-files-regexp))
    (define-key map [menu-bar regexp mark]
      '("Mark..." . dired-mark-files-regexp))

    (define-key map [menu-bar mark]
      (cons "Mark" (make-sparse-keymap "Mark")))

    (define-key map [menu-bar mark prev]
      '("Previous Marked" . dired-prev-marked-file))
    (define-key map [menu-bar mark next]
      '("Next Marked" . dired-next-marked-file))
    (define-key map [menu-bar mark marks]
      '("Change Marks..." . dired-change-marks))
    (define-key map [menu-bar mark unmark-all]
      '("Unmark All" . dired-unmark-all-files-no-query))
    (define-key map [menu-bar mark symlinks]
      '("Mark Symlinks" . dired-mark-symlinks))
    (define-key map [menu-bar mark directories]
      '("Mark Directories" . dired-mark-directories))
    (define-key map [menu-bar mark directory]
      '("Mark Old Backups" . dired-clean-directory))
    (define-key map [menu-bar mark executables]
      '("Mark Executables" . dired-mark-executables))
    (define-key map [menu-bar mark backup-files]
      '("Flag Backup Files" . dired-flag-backup-files))
    (define-key map [menu-bar mark auto-save-files]
      '("Flag Auto-save Files" . dired-flag-auto-save-files))
    (define-key map [menu-bar mark deletion]
      '("Flag" . dired-flag-file-deletion))
    (define-key map [menu-bar mark unmark]
      '("Unmark" . dired-unmark))
    (define-key map [menu-bar mark mark]
      '("Mark" . dired-mark))

    (define-key map [menu-bar operate]
      (cons "Operate" (make-sparse-keymap "Operate")))

    (define-key map [menu-bar operate query-replace]
      '("Query Replace in Files..." . dired-do-query-replace))
    (define-key map [menu-bar operate search]
      '("Search Files..." . dired-do-search))
    (define-key map [menu-bar operate chown]
      '("Change Owner..." . dired-do-chown))
    (define-key map [menu-bar operate chgrp]
      '("Change Group..." . dired-do-chgrp))
    (define-key map [menu-bar operate chmod]
      '("Change Mode..." . dired-do-chmod))
    (define-key map [menu-bar operate load]
      '("Load" . dired-do-load))
    (define-key map [menu-bar operate compile]
      '("Byte-compile" . dired-do-byte-compile))
    (define-key map [menu-bar operate compress]
      '("Compress" . dired-do-compress))
    (define-key map [menu-bar operate print]
      '("Print" . dired-do-print))
    (define-key map [menu-bar operate hardlink]
      '("Hardlink to..." . dired-do-hardlink))
    (define-key map [menu-bar operate symlink]
      '("Symlink to..." . dired-do-symlink))
    (define-key map [menu-bar operate command]
      '("Shell Command..." . dired-do-shell-command))
    (define-key map [menu-bar operate delete]
      '("Delete" . dired-do-delete))
    (define-key map [menu-bar operate rename]
      '("Rename to..." . dired-do-rename))
    (define-key map [menu-bar operate copy]
      '("Copy to..." . dired-do-copy))

    (setq dired-mode-map map)))

;; Dired mode is suitable only for specially formatted data.
(put 'dired-mode 'mode-class 'special)

(defun dired-mode (&optional dirname switches)
  "\
Mode for \"editing\" directory listings.
In dired, you are \"editing\" a list of the files in a directory and
  \(optionally) its subdirectories, in the format of `ls -lR'.
  Each directory is a page: use \\[backward-page] and \\[forward-page] to move pagewise.
\"Editing\" means that you can run shell commands on files, visit,
  compress, load or byte-compile them, change their file attributes
  and insert subdirectories into the same buffer.  You can \"mark\"
  files for later commands or \"flag\" them for deletion, either file
  by file or all files matching certain criteria.
You can move using the usual cursor motion commands.\\<dired-mode-map>
Letters no longer insert themselves.  Digits are prefix arguments.
Instead, type \\[dired-flag-file-deletion] to flag a file for Deletion.
Type \\[dired-mark] to Mark a file or subdirectory for later commands.
  Most commands operate on the marked files and use the current file
  if no files are marked.  Use a numeric prefix argument to operate on
  the next ARG (or previous -ARG if ARG<0) files, or just `1'
  to operate on the current file only.  Prefix arguments override marks.
  Mark-using commands display a list of failures afterwards.  Type \\[dired-summary]
  to see why something went wrong.
Type \\[dired-unmark] to Unmark a file or all files of a subdirectory.
Type \\[dired-unmark-backward] to back up one line and unflag.
Type \\[dired-do-flagged-delete] to eXecute the deletions requested.
Type \\[dired-advertised-find-file] to Find the current line's file
  (or dired it in another buffer, if it is a directory).
Type \\[dired-find-file-other-window] to find file or dired directory in Other window.
Type \\[dired-maybe-insert-subdir] to Insert a subdirectory in this buffer.
Type \\[dired-do-rename] to Rename a file or move the marked files to another directory.
Type \\[dired-do-copy] to Copy files.
Type \\[dired-sort-toggle-or-edit] to toggle sorting by name/date or change the `ls' switches.
Type \\[revert-buffer] to read all currently expanded directories again.
  This retains all marks and hides subdirs again that were hidden before.
SPC and DEL can be used to move down and up by lines.

If dired ever gets confused, you can either type \\[revert-buffer] \
to read the
directories again, type \\[dired-do-redisplay] \
to relist a single or the marked files or a
subdirectory, or type \\[dired-build-subdir-alist] to parse the buffer
again for the directory tree.

Customization variables (rename this buffer and type \\[describe-variable] on each line
for more info):

  dired-listing-switches
  dired-trivial-filenames
  dired-shrink-to-fit
  dired-marker-char
  dired-del-marker
  dired-keep-marker-rename
  dired-keep-marker-copy
  dired-keep-marker-hardlink
  dired-keep-marker-symlink

Hooks (use \\[describe-variable] to see their documentation):

  dired-before-readin-hook
  dired-after-readin-hook
  dired-mode-hook
  dired-load-hook

Keybindings:
\\{dired-mode-map}"
  ;; Not to be called interactively (e.g. dired-directory will be set
  ;; to default-directory, which is wrong with wildcards).
  (kill-all-local-variables)
  (use-local-map dired-mode-map)
  (dired-advertise)			; default-directory is already set
  (setq major-mode 'dired-mode
	mode-name "Dired"
;;	case-fold-search nil
	buffer-read-only t
	selective-display t		; for subdirectory hiding
	mode-line-buffer-identification '("Dired: %17b"))
  (set (make-local-variable 'revert-buffer-function)
       (function dired-revert))
  (set (make-local-variable 'page-delimiter)
       "\n\n")
  (set (make-local-variable 'dired-directory)
       (or dirname default-directory))
  ;; list-buffers uses this to display the dir being edited in this buffer.
  (set (make-local-variable 'list-buffers-directory)
       (expand-file-name dired-directory))
  (set (make-local-variable 'dired-actual-switches)
       (or switches dired-listing-switches))
  (set (make-local-variable 'font-lock-defaults) '(dired-font-lock-keywords t))
  (dired-sort-other dired-actual-switches t)
  (run-hooks 'dired-mode-hook))

;; Idiosyncratic dired commands that don't deal with marks.

(defun dired-quit ()
  "Bury the current dired buffer."
  (interactive)
  (bury-buffer))

(defun dired-summary ()
  "Summarize basic Dired commands and show recent Dired errors."
  (interactive)
  (dired-why)
  ;>> this should check the key-bindings and use substitute-command-keys if non-standard
  (message
   "d-elete, u-ndelete, x-punge, f-ind, o-ther window, R-ename, C-opy, h-elp"))

(defun dired-undo ()
  "Undo in a dired buffer.
This doesn't recover lost files, it just undoes changes in the buffer itself.
You can use it to recover marks, killed lines or subdirs.
In the latter case, you have to do \\[dired-build-subdir-alist] to
parse the buffer again."
  (interactive)
  (let (buffer-read-only)
    (undo)))

(defun dired-next-line (arg)
  "Move down lines then position at filename.
Optional prefix ARG says how many lines to move; default is one line."
  (interactive "p")
  (next-line arg)
  (dired-move-to-filename))

(defun dired-previous-line (arg)
  "Move up lines then position at filename.
Optional prefix ARG says how many lines to move; default is one line."
  (interactive "p")
  (previous-line arg)
  (dired-move-to-filename))

(defun dired-next-dirline (arg &optional opoint)
  "Goto ARG'th next directory file line."
  (interactive "p")
  (or opoint (setq opoint (point)))
  (if (if (> arg 0)
	  (re-search-forward dired-re-dir nil t arg)
	(beginning-of-line)
	(re-search-backward dired-re-dir nil t (- arg)))
      (dired-move-to-filename)		; user may type `i' or `f'
    (goto-char opoint)
    (error "No more subdirectories")))

(defun dired-prev-dirline (arg)
  "Goto ARG'th previous directory file line."
  (interactive "p")
  (dired-next-dirline (- arg)))

(defun dired-up-directory (&optional other-window)
  "Run dired on parent directory of current directory.
Find the parent directory either in this buffer or another buffer.
Creates a buffer if necessary."
  (interactive "P")
  (let* ((dir (dired-current-directory))
	 (up (file-name-directory (directory-file-name dir))))
    (or (dired-goto-file (directory-file-name dir))
	;; Only try dired-goto-subdir if buffer has more than one dir.
	(and (cdr dired-subdir-alist)
	     (dired-goto-subdir up))
	(progn
	  (if other-window
	      (dired-other-window up)
	    (dired up))
	  (dired-goto-file dir)))))

;; Force `f' rather than `e' in the mode doc:
(defalias 'dired-advertised-find-file 'dired-find-file)
(defun dired-find-file ()
  "In dired, visit the file or directory named on this line."
  (interactive)
  (let ((file-name (file-name-sans-versions (dired-get-filename) t)))
    (if (file-exists-p file-name)
	(find-file file-name)
      (error "File no longer exists; type `g' to update Dired buffer"))))

(defun dired-mouse-find-file-other-window (event)
  "In dired, visit the file or directory name you click on."
  (interactive "e")
  (let (file)
    (save-excursion
      (set-buffer (window-buffer (posn-window (event-end event))))
      (save-excursion
	(goto-char (posn-point (event-end event)))
	(setq file (dired-get-filename))))
    (select-window (posn-window (event-end event)))
    (find-file-other-window (file-name-sans-versions file t))))

(defun dired-view-file ()
  "In dired, examine a file in view mode, returning to dired when done.
When file is a directory, show it in this buffer if it is inserted;
otherwise, display it in another buffer."
  (interactive)
  (if (file-directory-p (dired-get-filename))
      (or (and (cdr dired-subdir-alist)
	       (dired-goto-subdir (dired-get-filename)))
	  (dired (dired-get-filename)))
    (view-file (dired-get-filename))))

(defun dired-find-file-other-window ()
  "In dired, visit this file or directory in another window."
  (interactive)
  (find-file-other-window (file-name-sans-versions (dired-get-filename) t)))

(defun dired-display-file ()
  "In dired, display this file or directory in another window."
  (interactive)
  (let ((file (file-name-sans-versions (dired-get-filename) t)))
    (display-buffer (find-file-noselect file))))

;;; Functions for extracting and manipulating file names in dired buffers.

(defun dired-get-filename (&optional localp no-error-if-not-filep)
  "In dired, return name of file mentioned on this line.
Value returned normally includes the directory name.
Optional arg LOCALP with value `no-dir' means don't include directory
  name in result.  A value of t means construct name relative to
  `default-directory', which still may contain slashes if in a subdirectory.
Optional arg NO-ERROR-IF-NOT-FILEP means return nil if no filename on
  this line, otherwise an error occurs."
  (let (case-fold-search file p1 p2)
    (save-excursion
      (if (setq p1 (dired-move-to-filename (not no-error-if-not-filep)))
	  (setq p2 (dired-move-to-end-of-filename no-error-if-not-filep))))
    ;; nil if no file on this line, but no-error-if-not-filep is t:
    (if (setq file (and p1 p2 (buffer-substring p1 p2)))
	(progn
	  ;; Get rid of the mouse-face property that file names have.
	  (set-text-properties 0 (length file) nil file)
	  ;; Unquote names quoted by ls or by dired-insert-directory.
	  ;; Using read to unquote is much faster than substituting
	  ;; \007 (4 chars) -> ^G  (1 char) etc. in a lisp loop.
	  (setq file
		(read
		 (concat "\""
			 ;; some ls -b don't escape quotes, argh!
			 ;; This is not needed for GNU ls, though.
			 (or (dired-string-replace-match
			      "\\([^\\]\\|\\`\\)\"" file "\\1\\\\\"" nil t)
			     file)
			 "\"")))))
    (if (eq localp 'no-dir)
	file
      (and file (concat (dired-current-directory localp) file)))))

(defun dired-string-replace-match (regexp string newtext
					  &optional literal global)
  "Replace first match of REGEXP in STRING with NEWTEXT.
If it does not match, nil is returned instead of the new string.
Optional arg LITERAL means to take NEWTEXT literally.
Optional arg GLOBAL means to replace all matches."
  (if global
      (let ((start 0))
	(while (string-match regexp string start)
	  (let ((from-end (- (length string) (match-end 0))))
	    (setq string (replace-match newtext t literal string))
	    (setq start (- (length string) from-end))))
	  string)
    (if (not (string-match regexp string 0))
	nil
      (replace-match newtext t literal string))))

(defun dired-make-absolute (file &optional dir)
  ;;"Convert FILE (a pathname relative to DIR) to an absolute pathname."
  ;; We can't always use expand-file-name as this would get rid of `.'
  ;; or expand in / instead default-directory if DIR=="".
  ;; This should be good enough for ange-ftp, but might easily be
  ;; redefined (for VMS?).
  ;; It should be reasonably fast, though, as it is called in
  ;; dired-get-filename.
  (concat (or dir default-directory) file))

(defun dired-make-relative (file &optional dir no-error)
  ;;"Convert FILE (an absolute pathname) to a pathname relative to DIR.
  ;; Else error (unless NO-ERROR is non-nil, then FILE is returned unchanged)
  ;;DIR defaults to default-directory."
  ;; DIR must be file-name-as-directory, as with all directory args in
  ;; Emacs Lisp code.
  (or dir (setq dir default-directory))
  ;; This case comes into play if default-directory is set to
  ;; use ~.
  (if (and (> (length dir) 0) (= (aref dir 0) ?~))
      (setq dir (expand-file-name dir)))
  (if (string-match (concat "^" (regexp-quote dir)) file)
      (substring file (match-end 0))
    (if no-error
	file
      (error "%s: not in directory tree growing at %s" file dir))))

;;; Functions for finding the file name in a dired buffer line.

(defvar dired-move-to-filename-regexp
  "\\(Jan\\|Feb\\|Mar\\|Apr\\|May\\|Jun\\|Jul\\|Aug\\|Sep\\|Oct\\|Nov\\|Dec\\)[ ]+[0-9]+ [ 0-9][0-9][:0-9][0-9][ 0-9] "
  "Regular expression to match a month abbreviation followed by a number.")

(defconst dired-standard-move-to-filename-regexp
  "\\(Jan\\|Feb\\|Mar\\|Apr\\|May\\|Jun\\|Jul\\|Aug\\|Sep\\|Oct\\|Nov\\|Dec\\)[ ]+[0-9]+ [ 0-9][0-9][:0-9][0-9][ 0-9] "
  "Regular expression to match a month abbreviation followed by a number.")

;; Move to first char of filename on this line.
;; Returns position (point) or nil if no filename on this line."
(defun dired-move-to-filename (&optional raise-error eol)
  ;; This is the UNIX version.
  (or eol (setq eol (progn (end-of-line) (point))))
  (beginning-of-line)
  (if (re-search-forward dired-move-to-filename-regexp eol t)
      (goto-char (match-end 0))
    (if raise-error
	(error "No file on this line"))))

(defun dired-move-to-end-of-filename (&optional no-error)
  ;; Assumes point is at beginning of filename,
  ;; thus the rwx bit re-search-backward below will succeed in *this*
  ;; line if at all.  So, it should be called only after
  ;; (dired-move-to-filename t).
  ;; On failure, signals an error (with non-nil NO-ERROR just returns nil).
  ;; This is the UNIX version.
  (let (opoint file-type executable symlink hidden case-fold-search used-F eol)
    ;; case-fold-search is nil now, so we can test for capital F:
    (setq used-F (string-match "F" dired-actual-switches)
	  opoint (point)
          eol (save-excursion (end-of-line) (point))
	  hidden (and selective-display
		      (save-excursion (search-forward "\r" eol t))))
    (if hidden
	nil
      (save-excursion;; Find out what kind of file this is:
	;; Restrict perm bits to be non-blank,
	;; otherwise this matches one char to early (looking backward):
	;; "l---------" (some systems make symlinks that way)
	;; "----------" (plain file with zero perms)
	(if (re-search-backward
	     "\\([^ ]\\)[-r][-w]\\([^ ]\\)[-r][-w]\\([^ ]\\)[-r][-w]\\([^ ]\\)"
	     nil t)
	    (setq file-type (char-after (match-beginning 1))
		  symlink (eq file-type ?l)
		  ;; Only with -F we need to know whether it's an executable
		  executable (and
			      used-F
			      (string-match
			       "[xst]";; execute bit set anywhere?
			       (concat
				(buffer-substring (match-beginning 2)
						  (match-end 2))
				(buffer-substring (match-beginning 3)
						  (match-end 3))
				(buffer-substring (match-beginning 4)
						  (match-end 4))))))
	  (or no-error (error "No file on this line"))))
      ;; Move point to end of name:
      (if symlink
	  (if (search-forward " ->" eol t)
	      (progn
		(forward-char -3)
		(and used-F
		     dired-ls-F-marks-symlinks
		     (eq (preceding-char) ?@);; did ls really mark the link?
		     (forward-char -1))))
	(goto-char eol);; else not a symbolic link
	;; ls -lF marks dirs, sockets and executables with exactly one
	;; trailing character. (Executable bits on symlinks ain't mean
	;; a thing, even to ls, but we know it's not a symlink.)
	(and used-F
	     (or (memq file-type '(?d ?s))
		 executable)
	     (forward-char -1))))
    (or no-error
	(not (eq opoint (point)))
	(error (if hidden
		   (substitute-command-keys
		    "File line is hidden, type \\[dired-hide-subdir] to unhide")
		 "No file on this line")))
    (if (eq opoint (point))
	nil
      (point))))


;; Keeping Dired buffers in sync with the filesystem and with each other

(defvar dired-buffers nil
  ;; Enlarged by dired-advertise
  ;; Queried by function dired-buffers-for-dir. When this detects a
  ;; killed buffer, it is removed from this list.
  "Alist of expanded directories and their associated dired buffers.")

(defun dired-buffers-for-dir (dir)
;; Return a list of buffers that dired DIR (top level or in-situ subdir).
;; The list is in reverse order of buffer creation, most recent last.
;; As a side effect, killed dired buffers for DIR are removed from
;; dired-buffers.
  (setq dir (file-name-as-directory dir))
  (let ((alist dired-buffers) result elt buf)
    (while alist
      (setq elt (car alist)
	    buf (cdr elt))
      (if (buffer-name buf)
	  (if (dired-in-this-tree dir (car elt))
	      (if (assoc dir (save-excursion
			       (set-buffer buf)
			       dired-subdir-alist))
		  (setq result (cons buf result))))
	;; else buffer is killed - clean up:
	(setq dired-buffers (delq elt dired-buffers)))
      (setq alist (cdr alist)))
    result))

(defun dired-advertise ()
  ;;"Advertise in variable `dired-buffers' that we dired `default-directory'."
  ;; With wildcards we actually advertise too much.
  (let ((expanded-default (expand-file-name default-directory)))
    (if (memq (current-buffer) (dired-buffers-for-dir expanded-default))
	t				; we have already advertised ourselves
      (setq dired-buffers
	    (cons (cons expanded-default (current-buffer))
		  dired-buffers)))))

(defun dired-unadvertise (dir)
  ;; Remove DIR from the buffer alist in variable dired-buffers.
  ;; This has the effect of removing any buffer whose main directory is DIR.
  ;; It does not affect buffers in which DIR is a subdir.
  ;; Removing is also done as a side-effect in dired-buffer-for-dir.
  (setq dired-buffers
	(delq (assoc (expand-file-name dir) dired-buffers) dired-buffers)))

;; Tree Dired

;;; utility functions

(defun dired-in-this-tree (file dir)
  ;;"Is FILE part of the directory tree starting at DIR?"
  (let (case-fold-search)
    (string-match (concat "^" (regexp-quote dir)) file)))

(defun dired-normalize-subdir (dir)
  ;; Prepend default-directory to DIR if relative path name.
  ;; dired-get-filename must be able to make a valid filename from a
  ;; file and its directory DIR.
  (file-name-as-directory
   (if (file-name-absolute-p dir)
       dir
     (expand-file-name dir default-directory))))

(defun dired-get-subdir ()
  ;;"Return the subdir name on this line, or nil if not on a headerline."
  ;; Look up in the alist whether this is a headerline.
  (save-excursion
    (let ((cur-dir (dired-current-directory)))
      (beginning-of-line)		; alist stores b-o-l positions
      (and (zerop (- (point)
		     (dired-get-subdir-min (assoc cur-dir
						  dired-subdir-alist))))
	   cur-dir))))

;(defun dired-get-subdir-min (elt)
;  (cdr elt))
;; can't use macro,  must be redefinable for other alist format in dired-nstd.
(defalias 'dired-get-subdir-min 'cdr)

(defun dired-get-subdir-max (elt)
  (save-excursion
    (goto-char (dired-get-subdir-min elt))
    (dired-subdir-max)))

(defun dired-clear-alist ()
  (while dired-subdir-alist
    (set-marker (dired-get-subdir-min (car dired-subdir-alist)) nil)
    (setq dired-subdir-alist (cdr dired-subdir-alist))))

(defun dired-subdir-index (dir)
  ;; Return an index into alist for use with nth
  ;; for the sake of subdir moving commands.
  (let (found (index 0) (alist dired-subdir-alist))
    (while alist
      (if (string= dir (car (car alist)))
	  (setq alist nil found t)
	(setq alist (cdr alist) index (1+ index))))
    (if found index nil)))

(defun dired-next-subdir (arg &optional no-error-if-not-found no-skip)
  "Go to next subdirectory, regardless of level."
  ;; Use 0 arg to go to this directory's header line.
  ;; NO-SKIP prevents moving to end of header line, returning whatever
  ;; position was found in dired-subdir-alist.
  (interactive "p")
  (let ((this-dir (dired-current-directory))
	pos index)
    ;; nth with negative arg does not return nil but the first element
    (setq index (- (dired-subdir-index this-dir) arg))
    (setq pos (if (>= index 0)
		  (dired-get-subdir-min (nth index dired-subdir-alist))))
    (if pos
	(progn
	  (goto-char pos)
	  (or no-skip (skip-chars-forward "^\n\r"))
	  (point))
      (if no-error-if-not-found
	  nil				; return nil if not found
	(error "%s directory" (if (> arg 0) "Last" "First"))))))

(defun dired-build-subdir-alist ()
  "Build `dired-subdir-alist' by parsing the buffer.
Returns the new value of the alist."
  (interactive)
  (dired-clear-alist)
  (save-excursion
    (let ((count 0)
	  (buffer-read-only nil)
	  new-dir-name)
      (goto-char (point-min))
      (setq dired-subdir-alist nil)
      (while (and (re-search-forward dired-subdir-regexp nil t)
		  ;; Avoid taking a file name ending in a colon
		  ;; as a subdir name.
		  (not (save-excursion
			 (goto-char (match-beginning 0))
			 (beginning-of-line)
			 (forward-char 2)
			 (save-match-data (looking-at dired-re-perms)))))
	(save-excursion
	  (goto-char (match-beginning 1))
	  (setq new-dir-name
		(expand-file-name (buffer-substring (point) (match-end 1))))
	  (delete-region (point) (match-end 1))
	  (insert new-dir-name))
	(setq count (1+ count))
	(dired-alist-add-1 new-dir-name
			   ;; Place a sub directory boundary between lines.
			   (save-excursion
			     (goto-char (match-beginning 0))
			     (beginning-of-line)
			     (point-marker))))
      (if (> count 1)
	  (message "Buffer includes %d directories" count))
      ;; We don't need to sort it because it is in buffer order per
      ;; constructionem.  Return new alist:
      dired-subdir-alist)))

(defun dired-alist-add-1 (dir new-marker)
  ;; Add new DIR at NEW-MARKER.  Don't sort.
  (setq dired-subdir-alist
	(cons (cons (dired-normalize-subdir dir) new-marker)
	      dired-subdir-alist)))

(defun dired-goto-next-nontrivial-file ()
  ;; Position point on first nontrivial file after point.
  (dired-goto-next-file);; so there is a file to compare with
  (if (stringp dired-trivial-filenames)
      (while (and (not (eobp))
		  (string-match dired-trivial-filenames
				(file-name-nondirectory
				 (or (dired-get-filename nil t) ""))))
	(forward-line 1)
	(dired-move-to-filename))))

(defun dired-goto-next-file ()
  (let ((max (1- (dired-subdir-max))))
    (while (and (not (dired-move-to-filename)) (< (point) max))
      (forward-line 1))))

(defun dired-goto-file (file)
  "Go to file line of FILE in this dired buffer."
  ;; Return value of point on success, else nil.
  ;; FILE must be an absolute pathname.
  ;; Loses if FILE contains control chars like "\007" for which ls
  ;; either inserts "?" or "\\007" into the buffer, so we won't find
  ;; it in the buffer.
  (interactive
   (prog1				; let push-mark display its message
       (list (expand-file-name
	      (read-file-name "Goto file: "
			      (dired-current-directory))))
     (push-mark)))
  (setq file (directory-file-name file)) ; does no harm if no directory
  (let (found case-fold-search dir)
    (setq dir (or (file-name-directory file)
		  (error "Need absolute pathname for %s" file)))
    (save-excursion
      ;; The hair here is to get the result of dired-goto-subdir
      ;; without really calling it if we don't have any subdirs.
      (if (if (string= dir (expand-file-name default-directory))
	      (goto-char (point-min))
	    (and (cdr dired-subdir-alist)
		 (dired-goto-subdir dir)))
	  (let ((base (file-name-nondirectory file))
		(boundary (dired-subdir-max)))
	    (while (and (not found)
			;; filenames are preceded by SPC, this makes
			;; the search faster (e.g. for the filename "-"!).
 			(search-forward (concat " " base) boundary 'move))
	      ;; Match could have BASE just as initial substring or
	      ;; or in permission bits or date or
	      ;; not be a proper filename at all:
	      (if (equal base (dired-get-filename 'no-dir t))
		    ;; Must move to filename since an (actually
		    ;; correct) match could have been elsewhere on the
		    ;; ;; line (e.g. "-" would match somewhere in the
		    ;; permission bits).
		  (setq found (dired-move-to-filename))
		;; If this isn't the right line, move forward to avoid
		;; trying this line again.
		(forward-line 1))))))
    (and found
	 ;; return value of point (i.e., FOUND):
	 (goto-char found))))

(defun dired-initial-position (dirname)
  ;; Where point should go in a new listing of DIRNAME.
  ;; Point assumed at beginning of new subdir line.
  ;; You may redefine this function as you wish, e.g. like in dired-x.el.
  (end-of-line)
  (if dired-trivial-filenames (dired-goto-next-nontrivial-file)))

;; These are hooks which make tree dired work.
;; They are in this file because other parts of dired need to call them.
;; But they don't call the rest of tree dired unless there are subdirs loaded.

;; This function is called for each retrieved filename.
;; It could stand to be faster, though it's mostly function call
;; overhead.  Avoiding the function call seems to save about 10% in
;; dired-get-filename.  Make it a defsubst?
(defun dired-current-directory (&optional localp)
  "Return the name of the subdirectory to which this line belongs.
This returns a string with trailing slash, like `default-directory'.
Optional argument means return a file name relative to `default-directory'."
  (let ((here (point))
	(alist (or dired-subdir-alist
		   ;; probably because called in a non-dired buffer
		   (error "No subdir-alist in %s" (current-buffer))))
	elt dir)
    (while alist
      (setq elt (car alist)
	    dir (car elt)
	    ;; use `<=' (not `<') as subdir line is part of subdir
	    alist (if (<= (dired-get-subdir-min elt) here)
		      nil		; found
		    (cdr alist))))
    (if localp
	(dired-make-relative dir default-directory)
      dir)))

;; Subdirs start at the beginning of their header lines and end just
;; before the beginning of the next header line (or end of buffer).

(defun dired-subdir-max ()
  (save-excursion
    (if (or (null (cdr dired-subdir-alist)) (not (dired-next-subdir 1 t t)))
	(point-max)
      (point))))

;; Deleting files

(defun dired-do-flagged-delete (&optional nomessage)
  "In dired, delete the files flagged for deletion.
If NOMESSAGE is non-nil, we don't display any message
if there are no flagged files."
  (interactive)
  (let* ((dired-marker-char dired-del-marker)
	 (regexp (dired-marker-regexp))
	 case-fold-search)
    (if (save-excursion (goto-char (point-min))
			(re-search-forward regexp nil t))
	(dired-internal-do-deletions
	 ;; this can't move point since ARG is nil
	 (dired-map-over-marks (cons (dired-get-filename) (point))
			       nil)
	 nil)
      (or nomessage
	  (message "(No deletions requested)")))))

(defun dired-do-delete (&optional arg)
  "Delete all marked (or next ARG) files."
  ;; This is more consistent with the file marking feature than
  ;; dired-do-flagged-delete.
  (interactive "P")
  (dired-internal-do-deletions
   ;; this may move point if ARG is an integer
   (dired-map-over-marks (cons (dired-get-filename) (point))
			 arg)
   arg))

(defvar dired-deletion-confirmer 'yes-or-no-p) ; or y-or-n-p?

(defun dired-internal-do-deletions (l arg)
  ;; L is an alist of files to delete, with their buffer positions.
  ;; ARG is the prefix arg.
  ;; Filenames are absolute (VMS needs this for logical search paths).
  ;; (car L) *must* be the *last* (bottommost) file in the dired buffer.
  ;; That way as changes are made in the buffer they do not shift the
  ;; lines still to be changed, so the (point) values in L stay valid.
  ;; Also, for subdirs in natural order, a subdir's files are deleted
  ;; before the subdir itself - the other way around would not work.
  (let ((files (mapcar (function car) l))
	(count (length l))
	(succ 0))
    ;; canonicalize file list for pop up
    (setq files (nreverse (mapcar (function dired-make-relative) files)))
    (if (dired-mark-pop-up
	 " *Deletions*" 'delete files dired-deletion-confirmer
	 (format "Delete %s " (dired-mark-prompt arg files)))
	(save-excursion
	  (let (failures);; files better be in reverse order for this loop!
	    (while l
	      (goto-char (cdr (car l)))
	      (let (buffer-read-only)
		(condition-case err
		    (let ((fn (car (car l))))
		      ;; This test is equivalent to
		      ;; (and (file-directory-p fn) (not (file-symlink-p fn)))
		      ;; but more efficient
		      (if (eq t (car (file-attributes fn)))
			  (delete-directory fn)
			(delete-file fn))
		      ;; if we get here, removing worked
		      (setq succ (1+ succ))
		      (message "%s of %s deletions" succ count)
		      (delete-region (progn (beginning-of-line) (point))
				     (progn (forward-line 1) (point)))
		      (dired-clean-up-after-deletion fn))
		  (error;; catch errors from failed deletions
		   (dired-log "%s\n" err)
		   (setq failures (cons (car (car l)) failures)))))
	      (setq l (cdr l)))
	    (if (not failures)
		(message "%d deletion%s done" count (dired-plural-s count))
	      (dired-log-summary
	       (format "%d of %d deletion%s failed"
		       (length failures) count
		       (dired-plural-s count))
	       failures))))
      (message "(No deletions performed)")))
  (dired-move-to-filename))

;; This is a separate function for the sake of dired-x.el.
(defun dired-clean-up-after-deletion (fn)
  ;; Clean up after a deleted file or directory FN.
  (save-excursion (and (cdr dired-subdir-alist)
		       (dired-goto-subdir fn)
		       (dired-kill-subdir))))

;; Confirmation

(defun dired-marker-regexp ()
  (concat "^" (regexp-quote (char-to-string dired-marker-char))))

(defun dired-plural-s (count)
  (if (= 1 count) "" "s"))

(defun dired-mark-prompt (arg files)
  ;; Return a string for use in a prompt, either the current file
  ;; name, or the marker and a count of marked files.
  (let ((count (length files)))
    (if (= count 1)
	(car files)
      ;; more than 1 file:
      (if (integerp arg)
	  ;; abs(arg) = count
	  ;; Perhaps this is nicer, but it also takes more screen space:
	  ;;(format "[%s %d files]" (if (> arg 0) "next" "previous")
	  ;;                        count)
	  (format "[next %d files]" arg)
	(format "%c [%d files]" dired-marker-char count)))))

(defun dired-pop-to-buffer (buf)
  ;; Pop up buffer BUF.
  ;; If dired-shrink-to-fit is t, make its window fit its contents.
  (if (not dired-shrink-to-fit)
      (pop-to-buffer (get-buffer-create buf))
    ;; let window shrink to fit:
    (let ((window (selected-window))
	  target-lines w2)
      (cond ;; if split-window-threshold is enabled, use the largest window
            ((and (> (window-height (setq w2 (get-largest-window)))
		     split-height-threshold)
		  (= (frame-width) (window-width w2)))
	     (setq window w2))
	    ;; if the least-recently-used window is big enough, use it
	    ((and (> (window-height (setq w2 (get-lru-window)))
		     (* 2 window-min-height))
		  (= (frame-width) (window-width w2)))
	     (setq window w2)))
      (save-excursion
	(set-buffer buf)
	(goto-char (point-max))
	(skip-chars-backward "\n\r\t ")
	(setq target-lines (count-lines (point-min) (point)))
	;; Don't forget to count the last line.
	(if (not (bolp))
	    (setq target-lines (1+ target-lines))))
      (if (<= (window-height window) (* 2 window-min-height))
	  ;; At this point, every window on the frame is too small to split.
	  (setq w2 (display-buffer buf))
	(setq w2 (split-window window
		  (max window-min-height
		       (- (window-height window)
			  (1+ (max window-min-height target-lines)))))))
      (set-window-buffer w2 buf)
      (if (< (1- (window-height w2)) target-lines)
	  (progn
	    (select-window w2)
	    (enlarge-window (- target-lines (1- (window-height w2))))))
      (set-window-start w2 1)
      )))

(defvar dired-no-confirm nil
;;  "If non-nil, list of symbols for commands dired should not confirm.
;;It can be a sublist of
;;
;;  '(byte-compile chgrp chmod chown compress copy delete hardlink load
;;    move print shell symlink uncompress)"
  )

(defun dired-mark-pop-up (bufname op-symbol files function &rest args)
  ;;"Args BUFNAME OP-SYMBOL FILES FUNCTION &rest ARGS.
  ;;Return FUNCTION's result on ARGS after popping up a window (in a buffer
  ;;named BUFNAME, nil gives \" *Marked Files*\") showing the marked
  ;;files.  Uses function `dired-pop-to-buffer' to do that.
  ;; FUNCTION should not manipulate files.
  ;; It should only read input (an argument or confirmation).
  ;;The window is not shown if there is just one file or
  ;; OP-SYMBOL is a member of the list in `dired-no-confirm'.
  ;;FILES is the list of marked files."
  (or bufname (setq bufname  " *Marked Files*"))
  (if (or (memq op-symbol dired-no-confirm)
	  (= (length files) 1))
      (apply function args)
    (save-excursion
      (set-buffer (get-buffer-create bufname))
      (erase-buffer)
      (dired-format-columns-of-files files)
      (remove-text-properties (point-min) (point-max) '(mouse-face)))
    (save-window-excursion
      (dired-pop-to-buffer bufname)
      (apply function args))))

(defun dired-format-columns-of-files (files)
  ;; Files should be in forward order for this loop.
  ;; i.e., (car files) = first file in buffer.
  ;; Returns the number of lines used.
  (let* ((maxlen (+ 2 (apply 'max (mapcar 'length files))))
	 (width (- (window-width (selected-window)) 2))
	 (columns (max 1 (/ width maxlen)))
	 (nfiles (length files))
	 (rows (+ (/ nfiles columns)
		  (if (zerop (% nfiles columns)) 0 1)))
	 (i 0)
	 (j 0))
    (setq files (nconc (copy-sequence files) ; fill up with empty fns
		       (make-list (- (* columns rows) nfiles) "")))
    (setcdr (nthcdr (1- (length files)) files) files) ; make circular
    (while (< j rows)
      (while (< i columns)
	(indent-to (* i maxlen))
	(insert (car files))
	(setq files (nthcdr rows files)
	      i (1+ i)))
      (insert "\n")
      (setq i 0
	    j (1+ j)
	    files (cdr files)))
    rows))

;; Commands to mark or flag file(s) at or near current line.

(defun dired-repeat-over-lines (arg function)
  ;; This version skips non-file lines.
  (let ((pos (make-marker)))
    (beginning-of-line)
    (while (and (> arg 0) (not (eobp)))
      (setq arg (1- arg))
      (beginning-of-line)
      (while (and (not (eobp)) (dired-between-files)) (forward-line 1))
      (save-excursion
	(forward-line 1)
	(move-marker pos (1+ (point))))
      (save-excursion (funcall function))
      ;; Advance to the next line--actually, to the line that *was* next.
      ;; (If FUNCTION inserted some new lines in between, skip them.)
      (goto-char pos))
    (while (and (< arg 0) (not (bobp)))
      (setq arg (1+ arg))
      (forward-line -1)
      (while (and (not (bobp)) (dired-between-files)) (forward-line -1))
      (beginning-of-line)
      (save-excursion (funcall function)))
    (move-marker pos nil)
    (dired-move-to-filename)))

(defun dired-between-files ()
  ;; Point must be at beginning of line
  ;; Should be equivalent to (save-excursion (not (dired-move-to-filename)))
  ;; but is about 1.5..2.0 times as fast. (Actually that's not worth it)
  (or (looking-at "^$\\|^. *$\\|^. total\\|^. wildcard")
      (and (looking-at dired-subdir-regexp)
	   (save-excursion (not (dired-move-to-filename))))))

(defun dired-next-marked-file (arg &optional wrap opoint)
  "Move to the next marked file, wrapping around the end of the buffer."
  (interactive "p\np")
  (or opoint (setq opoint (point)));; return to where interactively started
  (if (if (> arg 0)
	  (re-search-forward dired-re-mark nil t arg)
	(beginning-of-line)
	(re-search-backward dired-re-mark nil t (- arg)))
      (dired-move-to-filename)
    (if (null wrap)
	(progn
	  (goto-char opoint)
	  (error "No next marked file"))
      (message "(Wraparound for next marked file)")
      (goto-char (if (> arg 0) (point-min) (point-max)))
      (dired-next-marked-file arg nil opoint))))

(defun dired-prev-marked-file (arg &optional wrap)
  "Move to the previous marked file, wrapping around the end of the buffer."
  (interactive "p\np")
  (dired-next-marked-file (- arg) wrap))

(defun dired-file-marker (file)
  ;; Return FILE's marker, or nil if unmarked.
  (save-excursion
    (and (dired-goto-file file)
	 (progn
	   (beginning-of-line)
	   (if (not (equal ?\040 (following-char)))
	       (following-char))))))

(defun dired-mark-files-in-region (start end)
  (let (buffer-read-only)
    (if (> start end)
	(error "start > end"))
    (goto-char start)			; assumed at beginning of line
    (while (< (point) end)
      ;; Skip subdir line and following garbage like the `total' line:
      (while (and (< (point) end) (dired-between-files))
	(forward-line 1))
      (if (and (not (looking-at dired-re-dot))
	       (dired-get-filename nil t))
	  (progn
	    (delete-char 1)
	    (insert dired-marker-char)))
      (forward-line 1))))

(defun dired-mark (arg)
  "Mark the current (or next ARG) files.
If on a subdir headerline, mark all its files except `.' and `..'.

Use \\[dired-unmark-all-files] to remove all marks
and \\[dired-unmark] on a subdir to remove the marks in
this subdir."
  (interactive "P")
  (if (dired-get-subdir)
      (save-excursion (dired-mark-subdir-files))
    (let (buffer-read-only)
      (dired-repeat-over-lines
       (prefix-numeric-value arg)
       (function (lambda () (delete-char 1) (insert dired-marker-char)))))))

(defun dired-unmark (arg)
  "Unmark the current (or next ARG) files.
If looking at a subdir, unmark all its files except `.' and `..'."
  (interactive "P")
  (let ((dired-marker-char ?\040))
    (dired-mark arg)))

(defun dired-flag-file-deletion (arg)
  "In dired, flag the current line's file for deletion.
With prefix arg, repeat over several lines.

If on a subdir headerline, mark all its files except `.' and `..'."
  (interactive "P")
  (let ((dired-marker-char dired-del-marker))
    (dired-mark arg)))

(defun dired-unmark-backward (arg)
  "In dired, move up lines and remove deletion flag there.
Optional prefix ARG says how many lines to unflag; default is one line."
  (interactive "p")
  (dired-unmark (- arg)))

;;; Commands to mark or flag files based on their characteristics or names.

(defvar dired-regexp-history nil
  "History list of regular expressions used in Dired commands.")

(defun dired-read-regexp (prompt)
  (read-from-minibuffer prompt nil nil nil 'dired-regexp-history))

(defun dired-mark-files-regexp (regexp &optional marker-char)
  "Mark all files matching REGEXP for use in later commands.
A prefix argument means to unmark them instead.
`.' and `..' are never marked.

REGEXP is an Emacs regexp, not a shell wildcard.  Thus, use `\\.o$' for
object files--just `.o' will mark more than you might think."
  (interactive
   (list (dired-read-regexp (concat (if current-prefix-arg "Unmark" "Mark")
				    " files (regexp): "))
	 (if current-prefix-arg ?\040)))
  (let ((dired-marker-char (or marker-char dired-marker-char)))
    (dired-mark-if
     (and (not (looking-at dired-re-dot))
	  (not (eolp))			; empty line
	  (let ((fn (dired-get-filename nil t)))
	    (and fn (string-match regexp (file-name-nondirectory fn)))))
     "matching file")))

(defun dired-flag-files-regexp (regexp)
  "In dired, flag all files containing the specified REGEXP for deletion.
The match is against the non-directory part of the filename.  Use `^'
  and `$' to anchor matches.  Exclude subdirs by hiding them.
`.' and `..' are never flagged."
  (interactive (list (dired-read-regexp "Flag for deletion (regexp): ")))
  (dired-mark-files-regexp regexp dired-del-marker))

(defun dired-mark-symlinks (unflag-p)
  "Mark all symbolic links.
With prefix argument, unflag all those files."
  (interactive "P")
  (let ((dired-marker-char (if unflag-p ?\040 dired-marker-char)))
    (dired-mark-if (looking-at dired-re-sym) "symbolic link")))

(defun dired-mark-directories (unflag-p)
  "Mark all directory file lines except `.' and `..'.
With prefix argument, unflag all those files."
  (interactive "P")
  (let ((dired-marker-char (if unflag-p ?\040 dired-marker-char)))
    (dired-mark-if (and (looking-at dired-re-dir)
			(not (looking-at dired-re-dot)))
		   "directory file")))

(defun dired-mark-executables (unflag-p)
  "Mark all executable files.
With prefix argument, unflag all those files."
  (interactive "P")
  (let ((dired-marker-char (if unflag-p ?\040 dired-marker-char)))
    (dired-mark-if (looking-at dired-re-exe) "executable file")))

;; dired-x.el has a dired-mark-sexp interactive command: mark
;; files for which PREDICATE returns non-nil.

(defun dired-flag-auto-save-files (&optional unflag-p)
  "Flag for deletion files whose names suggest they are auto save files.
A prefix argument says to unflag those files instead."
  (interactive "P")
  (let ((dired-marker-char (if unflag-p ?\040 dired-del-marker)))
    (dired-mark-if
     ;; It is less than general to check for # here,
     ;; but it's the only way this runs fast enough.
     (and (save-excursion (end-of-line)
                          (or
                           (eq (preceding-char) ?#)
                           ;; Handle executables in case of -F option.
                           ;; We need not worry about the other kinds
                           ;; of markings that -F makes, since they won't
                           ;; appear on real auto-save files.
                           (if (eq (preceding-char) ?*)
                               (progn
                                 (forward-char -1)
                                 (eq (preceding-char) ?#)))))
	  (not (looking-at dired-re-dir))
	  (let ((fn (dired-get-filename t t)))
	    (if fn (auto-save-file-name-p
		    (file-name-nondirectory fn)))))
     "auto save file")))

(defun dired-flag-backup-files (&optional unflag-p)
  "Flag all backup files (names ending with `~') for deletion.
With prefix argument, unflag these files."
  (interactive "P")
  (let ((dired-marker-char (if unflag-p ?\  dired-del-marker)))
    (dired-mark-if
     ;; Don't call backup-file-name-p unless the last character looks like
     ;; it might be the end of a backup file name.  This isn't very general,
     ;; but it's the only way this runs fast enough.
     (and (save-excursion (end-of-line)
			  ;; Handle executables in case of -F option.
			  ;; We need not worry about the other kinds
			  ;; of markings that -F makes, since they won't
			  ;; appear on real backup files.
			  (if (eq (preceding-char) ?*)
			      (forward-char -1))
			  (eq (preceding-char) ?~))
	  (not (looking-at dired-re-dir))
	  (let ((fn (dired-get-filename t t)))
	    (if fn (backup-file-name-p fn))))
     "backup file")))

(defun dired-change-marks (&optional old new)
  "Change all OLD marks to NEW marks.
OLD and NEW are both characters used to mark files."
  (interactive
   (let* ((cursor-in-echo-area t)
	  (old (progn (message "Change (old mark): ") (read-char)))
	  (new (progn (message  "Change %c marks to (new mark): " old)
		      (read-char))))
     (list old new)))
  (if (or (eq old ?\r) (eq new ?\r))
      (ding)
    (let ((string (format "\n%c" old))
	  (buffer-read-only))
      (save-excursion
	(goto-char (point-min))
	(while (search-forward string nil t)
	  (if (if (= old ?\ )
		  (save-match-data
		    (dired-get-filename 'no-dir t))
		t)
	      (subst-char-in-region (match-beginning 0)
				    (match-end 0) old new)))))))

(defun dired-unmark-all-files-no-query ()
  "Remove all marks from all files in the Dired buffer."
  (interactive)
  (dired-unmark-all-files ?\r))

(defun dired-unmark-all-files (mark &optional arg)
  "Remove a specific mark (or any mark) from every file.
After this command, type the mark character to remove, 
or type RET to remove all marks.
With prefix arg, query for each marked file.
Type \\[help-command] at that time for help."
  (interactive "cRemove marks (RET means all): \nP")
  (save-excursion
    (let* ((count 0)
	   buffer-read-only case-fold-search query
	   (string (format "\n%c" mark))
	   (help-form "\
Type SPC or `y' to unmark one file, DEL or `n' to skip to next,
`!' to unmark all remaining files with no more questions."))
      (goto-char (point-min))
      (while (if (eq mark ?\r)
		 (re-search-forward dired-re-mark nil t)
	       (search-forward string nil t))
	(if (or (not arg)
		(dired-query 'query "Unmark file `%s'? "
			     (dired-get-filename t)))
	    (progn (subst-char-in-region (1- (point)) (point)
					 (preceding-char) ?\ )
		   (setq count (1+ count)))))
      (message (if (= count 1) "1 mark removed"
		 "%d marks removed")
	       count))))

;; Logging failures operating on files, and showing the results.

(defvar dired-log-buffer "*Dired log*")

(defun dired-why ()
  "Pop up a buffer with error log output from Dired.
A group of errors from a single command ends with a formfeed.
Thus, use \\[backward-page] to find the beginning of a group of errors."
  (interactive)
  (if (get-buffer dired-log-buffer)
      (let ((owindow (selected-window))
	    (window (display-buffer (get-buffer dired-log-buffer))))
	(unwind-protect
	    (progn
	      (select-window window)
	      (goto-char (point-max))
	      (recenter -1))
	  (select-window owindow)))))

(defun dired-log (log &rest args)
  ;; Log a message or the contents of a buffer.
  ;; If LOG is a string and there are more args, it is formatted with
  ;; those ARGS.  Usually the LOG string ends with a \n.
  ;; End each bunch of errors with (dired-log t): this inserts
  ;; current time and buffer, and a \f (formfeed).
  (let ((obuf (current-buffer)))
    (unwind-protect			; want to move point
	(progn
	  (set-buffer (get-buffer-create dired-log-buffer))
	  (goto-char (point-max))
	  (let (buffer-read-only)
	    (cond ((stringp log)
		   (insert (if args
			       (apply (function format) log args)
			     log)))
		  ((bufferp log)
		   (insert-buffer log))
		  ((eq t log)
		   (insert "\n\t" (current-time-string)
			   "\tBuffer `" (buffer-name obuf) "'\n\f\n")))))
      (set-buffer obuf))))

(defun dired-log-summary (string failures)
  (message (if failures "%s--type ? for details (%s)"
	     "%s--type ? for details")
	   string failures)
  ;; Log a summary describing a bunch of errors.
  (dired-log (concat "\n" string))
  (dired-log t))

;;; Sorting

;; Most ls can only sort by name or by date (with -t), nothing else.
;; GNU ls sorts on size with -S, on extension with -X, and unsorted with -U.
;; So anything that does not contain these is sort "by name".

(defvar dired-ls-sorting-switches "SXU"
  "String of `ls' switches (single letters) except `t' that influence sorting.")

(defvar dired-sort-by-date-regexp
  (concat "^-[^" dired-ls-sorting-switches
	  "]*t[^" dired-ls-sorting-switches "]*$")
  "Regexp recognized by dired to set `by date' mode.")

(defvar dired-sort-by-name-regexp
  (concat "^-[^t" dired-ls-sorting-switches "]+$")
  "Regexp recognized by dired to set `by name' mode.")

(defun dired-sort-set-modeline ()
  ;; Set modeline display according to dired-actual-switches.
  ;; Modeline display of "by name" or "by date" guarantees the user a
  ;; match with the corresponding regexps.  Non-matching switches are
  ;; shown literally.
  (setq mode-name
	(let (case-fold-search)
	  (cond ((string-match dired-sort-by-name-regexp dired-actual-switches)
		 "Dired by name")
		((string-match dired-sort-by-date-regexp dired-actual-switches)
		 "Dired by date")
		(t
		 (concat "Dired " dired-actual-switches)))))
  (force-mode-line-update))

(defun dired-sort-toggle-or-edit (&optional arg)
  "Toggle between sort by date/name and refresh the dired buffer.
With a prefix argument you can edit the current listing switches instead."
  (interactive "P")
  (if arg
      (dired-sort-other
       (read-string "ls switches (must contain -l): " dired-actual-switches))
    (dired-sort-toggle)))

(defun dired-sort-toggle ()
  ;; Toggle between sort by date/name.  Reverts the buffer.
  (setq dired-actual-switches
	(let (case-fold-search)
	  (concat
	   "-l"
	   (dired-replace-in-string (concat "[-lt"
					    dired-ls-sorting-switches "]")
				    ""
				    dired-actual-switches)
	   (if (string-match (concat "[t" dired-ls-sorting-switches "]")
			     dired-actual-switches)
	       ""
	     "t"))))
  (dired-sort-set-modeline)
  (revert-buffer))

(defun dired-replace-in-string (regexp newtext string)
  ;; Replace REGEXP with NEWTEXT everywhere in STRING and return result.
  ;; NEWTEXT is taken literally---no \\DIGIT escapes will be recognized.
  (let ((result "") (start 0) mb me)
    (while (string-match regexp string start)
      (setq mb (match-beginning 0)
	    me (match-end 0)
	    result (concat result (substring string start mb) newtext)
	    start me))
    (concat result (substring string start))))

(defun dired-sort-other (switches &optional no-revert)
  ;; Specify new ls SWITCHES for current dired buffer.  Values matching
  ;; `dired-sort-by-date-regexp' or `dired-sort-by-name-regexp' set the
  ;; minor mode accordingly, others appear literally in the mode line.
  ;; With optional second arg NO-REVERT, don't refresh the listing afterwards.
  (setq dired-actual-switches switches)
  (if (eq major-mode 'dired-mode) (dired-sort-set-modeline))
  (or no-revert (revert-buffer)))

;; To make this file smaller, the less common commands
;; go in a separate file.  But autoload them here
;; to make the separation invisible.

(autoload 'dired-diff "dired-aux"
  "Compare file at point with file FILE using `diff'.
FILE defaults to the file at the mark.
The prompted-for file is the first file given to `diff'."
  t)

(autoload 'dired-backup-diff "dired-aux"
  "Diff this file with its backup file or vice versa.
Uses the latest backup, if there are several numerical backups.
If this file is a backup, diff it with its original.
The backup file is the first file given to `diff'."
  t)

(autoload 'dired-clean-directory "dired-aux"
  "Flag numerical backups for deletion.
Spares `dired-kept-versions' latest versions, and `kept-old-versions' oldest.
Positive prefix arg KEEP overrides `dired-kept-versions';
Negative prefix arg KEEP overrides `kept-old-versions' with KEEP made positive.

To clear the flags on these files, you can use \\[dired-flag-backup-files]
with a prefix argument."
  t)

(autoload 'dired-do-chmod "dired-aux"
  "Change the mode of the marked (or next ARG) files.
This calls chmod, thus symbolic modes like `g+w' are allowed."
  t)

(autoload 'dired-do-chgrp "dired-aux"
  "Change the group of the marked (or next ARG) files."
  t)

(autoload 'dired-do-chown "dired-aux"
  "Change the owner of the marked (or next ARG) files."
  t)

(autoload 'dired-do-print "dired-aux"
  "Print the marked (or next ARG) files.
Uses the shell command coming from variables `lpr-command' and
`lpr-switches' as default."
  t)

(autoload 'dired-do-shell-command "dired-aux"
  "Run a shell command COMMAND on the marked files.
If no files are marked or a specific numeric prefix arg is given,
the next ARG files are used.  Just \\[universal-argument] means the current file.
The prompt mentions the file(s) or the marker, as appropriate.

If there is output, it goes to a separate buffer.

Normally the command is run on each file individually.
However, if there is a `*' in the command then it is run
just once with the entire file list substituted there.

No automatic redisplay of dired buffers is attempted, as there's no
telling what files the command may have changed.  Type
\\[dired-do-redisplay] to redisplay the marked files.

The shell command has the top level directory as working directory, so
output files usually are created there instead of in a subdir."
  t)

(autoload 'dired-do-kill-lines "dired-aux"
  "Kill all marked lines (not the files).
With a prefix arg, kill all lines not marked or flagged."
  t)

(autoload 'dired-do-compress "dired-aux"
  "Compress or uncompress marked (or next ARG) files."
  t)

(autoload 'dired-do-byte-compile "dired-aux"
  "Byte compile marked (or next ARG) Emacs Lisp files."
  t)

(autoload 'dired-do-load "dired-aux"
  "Load the marked (or next ARG) Emacs Lisp files."
  t)

(autoload 'dired-do-redisplay "dired-aux"
  "Redisplay all marked (or next ARG) files.
If on a subdir line, redisplay that subdirectory.  In that case,
a prefix arg lets you edit the `ls' switches used for the new listing."
  t)

(autoload 'dired-string-replace-match "dired-aux"
  "Replace first match of REGEXP in STRING with NEWTEXT.
If it does not match, nil is returned instead of the new string.
Optional arg LITERAL means to take NEWTEXT literally.
Optional arg GLOBAL means to replace all matches."
  t)

(autoload 'dired-create-directory "dired-aux"
  "Create a directory called DIRECTORY."
  t)

(autoload 'dired-do-copy "dired-aux"
  "Copy all marked (or next ARG) files, or copy the current file.
Thus, a zero prefix argument copies nothing.  But it toggles the
variable `dired-copy-preserve-time' (which see)."
  t)

(autoload 'dired-do-symlink "dired-aux"
  "Make symbolic links to current file or all marked (or next ARG) files.
When operating on just the current file, you specify the new name.
When operating on multiple or marked files, you specify a directory
and new symbolic links are made in that directory
with the same names that the files currently have."
  t)

(autoload 'dired-do-hardlink "dired-aux"
  "Add names (hard links) current file or all marked (or next ARG) files.
When operating on just the current file, you specify the new name.
When operating on multiple or marked files, you specify a directory
and new hard links are made in that directory
with the same names that the files currently have."
  t)

(autoload 'dired-do-rename "dired-aux"
  "Rename current file or all marked (or next ARG) files.
When renaming just the current file, you specify the new name.
When renaming multiple or marked files, you specify a directory."
  t)

(autoload 'dired-do-rename-regexp "dired-aux"
  "Rename marked files containing REGEXP to NEWNAME.
As each match is found, the user must type a character saying
  what to do with it.  For directions, type \\[help-command] at that time.
NEWNAME may contain \\=\\<n> or \\& as in `query-replace-regexp'.
REGEXP defaults to the last regexp used.
With a zero prefix arg, renaming by regexp affects the complete
  pathname - usually only the non-directory part of file names is used
  and changed."
  t)

(autoload 'dired-do-copy-regexp "dired-aux"
  "Copy all marked files containing REGEXP to NEWNAME.
See function `dired-rename-regexp' for more info."
  t)

(autoload 'dired-do-hardlink-regexp "dired-aux"
  "Hardlink all marked files containing REGEXP to NEWNAME.
See function `dired-rename-regexp' for more info."
  t)

(autoload 'dired-do-symlink-regexp "dired-aux"
  "Symlink all marked files containing REGEXP to NEWNAME.
See function `dired-rename-regexp' for more info."
  t)

(autoload 'dired-upcase "dired-aux"
  "Rename all marked (or next ARG) files to upper case."
  t)

(autoload 'dired-downcase "dired-aux"
  "Rename all marked (or next ARG) files to lower case."
  t)

(autoload 'dired-maybe-insert-subdir "dired-aux"
  "Insert this subdirectory into the same dired buffer.
If it is already present, just move to it (type \\[dired-do-redisplay] to refresh),
  else inserts it at its natural place (as `ls -lR' would have done).
With a prefix arg, you may edit the ls switches used for this listing.
  You can add `R' to the switches to expand the whole tree starting at
  this subdirectory.
This function takes some pains to conform to `ls -lR' output."
  t)

(autoload 'dired-next-subdir "dired-aux"
  "Go to next subdirectory, regardless of level."
  t)

(autoload 'dired-prev-subdir "dired-aux"
  "Go to previous subdirectory, regardless of level.
When called interactively and not on a subdir line, go to this subdir's line."
  t)

(autoload 'dired-goto-subdir "dired-aux"
  "Go to end of header line of DIR in this dired buffer.
Return value of point on success, otherwise return nil.
The next char is either \\n, or \\r if DIR is hidden."
  t)

(autoload 'dired-mark-subdir-files "dired-aux"
  "Mark all files except `.' and `..'."
  t)

(autoload 'dired-kill-subdir "dired-aux"
  "Remove all lines of current subdirectory.
Lower levels are unaffected."
  t)

(autoload 'dired-tree-up "dired-aux"
  "Go up ARG levels in the dired tree."
  t)

(autoload 'dired-tree-down "dired-aux"
  "Go down in the dired tree."
  t)

(autoload 'dired-hide-subdir "dired-aux"
  "Hide or unhide the current subdirectory and move to next directory.
Optional prefix arg is a repeat factor.
Use \\[dired-hide-all] to (un)hide all directories."
  t)

(autoload 'dired-hide-all "dired-aux"
  "Hide all subdirectories, leaving only their header lines.
If there is already something hidden, make everything visible again.
Use \\[dired-hide-subdir] to (un)hide a particular subdirectory."
  t)

(if (eq system-type 'vax-vms)
    (load "dired-vms"))

(provide 'dired)

(run-hooks 'dired-load-hook)		; for your customizations

;;; dired.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.