all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob 3d82d878bf304f23370ad16f63c8049dd51a6684 76854 bytes (raw)
name: lisp/progmodes/dcl-mode.el 	 # note: path name is non-authoritative(*)

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

;; Copyright (C) 1997, 2001-2020 Free Software Foundation, Inc.

;; Author: Odd Gripenstam <gripenstamol@decus.se>
;; Maintainer: emacs-devel@gnu.org
;; Keywords: DCL editing major-mode languages

;; This file is part of GNU Emacs.

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

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

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

;;; Commentary:

;; DCL mode is a package for editing DCL command files.  It helps you
;; indent lines, add leading `$' and trailing `-', move around in the
;; code and insert lexical functions.
;;
;; Type `C-h m' when you are editing a .COM file to get more
;; information about this mode.
;;
;; To use templates you will need a version of tempo.el that is at
;; least later than the buggy 1.1.1, which was included with my versions of
;; Emacs.  I used version 1.2.4.
;; The latest tempo.el distribution can be fetched from
;; ftp.lysator.liu.se in the directory /pub/emacs.
;; I recommend setting (setq tempo-interactive t).  This will make
;; tempo prompt you for values to put in the blank spots in the templates.
;;
;; There is limited support for imenu.  The limitation is that you need
;; a version of imenu.el that uses imenu-generic-expression.  I found
;; the version I use in Emacs 19.30.  (It was *so* much easier to hook
;; into that version than the one in 19.27...)
;;
;; Any feedback will be welcomed.  If you write functions for
;; dcl-calc-command-indent-function or dcl-calc-cont-indent-function,
;; please send them to the maintainer.
;;
;;
;; Ideas for improvement:
;; * Better font-lock support.
;; * Change meaning of `left margin' when dcl-tab-always-indent is nil.
;;   Consider the following line (`_' is the cursor):
;;     $ label: _ command
;;   Pressing tab with the cursor at the underline now inserts a tab.
;;   This should be part of the left margin and pressing tab should indent
;;   the line.
;; * Make M-LFD work properly with comments in all cases.  Now it only
;;   works on comment-only lines.  But what is "properly"? New rules for
;;   indenting comments?
;; * Even smarter indentation of continuation lines.
;; * A delete-indentation function (M-^) that joins continued lines,
;;   including lines with end line comments?
;; * Handle DECK/EOD.
;; * `indent list' commands: C-M-q, C-u TAB.  What is a list in DCL? One
;;   complete command line? A block? A subroutine?

;;; Code:

(require 'tempo)

;;; *** Customization *****************************************************


;; First, font lock.  This is a minimal approach, please improve!

(defvar dcl-font-lock-keywords
  '(("\\<\\(if\\|then\\|else\\|endif\\)\\>"
     1 font-lock-keyword-face)
    ("\\<f[$][a-z_]+\\>"
     0 font-lock-builtin-face)
    ("[.]\\(eq\\|not\\|or\\|and\\|lt\\|gt\\|le\\|ge\\|eqs\\|nes\\)[.]"
     0 font-lock-builtin-face))
  "Font lock keyword specification for DCL mode.
Presently this includes some syntax, .OP.erators, and \"f$\" lexicals.")

(defvar dcl-font-lock-defaults
  '(dcl-font-lock-keywords nil)
  "Font lock specification for DCL mode.")


;; Now the rest.

(defgroup dcl nil
  "Major mode for editing DCL command files."
  :link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
  :group 'languages)

(defcustom dcl-basic-offset 4
  "Number of columns to indent a block in DCL.
A block is the commands between THEN-ELSE-ENDIF and between the commands
dcl-block-begin-regexp and dcl-block-end-regexp.

The meaning of this variable may be changed if
dcl-calc-command-indent-function is set to a function."
  :type 'integer
  :group 'dcl)


(defcustom dcl-continuation-offset 6
  "Number of columns to indent a continuation line in DCL.
A continuation line is a line that follows a line ending with `-'.

The meaning of this variable may be changed if
dcl-calc-cont-indent-function is set to a function."
  :type 'integer
  :group 'dcl)


(defcustom dcl-margin-offset 8
  "Indentation for the first command line in DCL.
The first command line in a file or after a SUBROUTINE statement is indented
this much.  Other command lines are indented the same number of columns as
the preceding command line.
A command line is a line that starts with `$'."
  :type 'integer
  :group 'dcl)


(defcustom dcl-margin-label-offset 2
  "Number of columns to indent a margin label in DCL.
A margin label is a label that doesn't begin or end a block, i.e. it
doesn't match dcl-block-begin-regexp or dcl-block-end-regexp."
  :type 'integer
  :group 'dcl)


(defcustom dcl-comment-line-regexp "^\\$!"
  "Regexp describing the start of a comment line in DCL.
Comment lines are not indented."
  :type 'regexp
  :group 'dcl)


(defcustom dcl-block-begin-regexp "loop[0-9]*:"
  "Regexp describing a command that begins an indented block in DCL.
Set to nil to only indent at THEN-ELSE-ENDIF."
  :type 'regexp
  :group 'dcl)


(defcustom dcl-block-end-regexp "endloop[0-9]*:"
  "Regexp describing a command that ends an indented block in DCL.
Set to nil to only indent at THEN-ELSE-ENDIF."
  :type 'regexp
  :group 'dcl)


(defcustom dcl-calc-command-indent-function nil
  "Function to calculate indentation for a command line in DCL.
If this variable is non-nil it is called as a function:

\(func INDENT-TYPE CUR-INDENT EXTRA-INDENT LAST-POINT THIS-POINT)

The function must return the number of columns to indent the current line or
nil to get the default indentation.

INDENT-TYPE is a symbol indicating what kind of indentation should be done.
It can have the following values:
  indent      the indentation should be increased, e.g., after THEN.
  outdent     the indentation should be decreased, e.g., a line with ENDIF.
  first-line  indentation for the first line in a buffer or SUBROUTINE.
CUR-INDENT is the indentation of the preceding command line.
EXTRA-INDENT is the default change in indentation for this line
\(a negative number for “outdent”).
LAST-POINT is the buffer position of the first significant word on the
previous line or nil if the current line is the first line.
THIS-POINT is the buffer position of the first significant word on the
current line.

If this variable is nil, the indentation is calculated as
CUR-INDENT + EXTRA-INDENT.

This package includes two functions suitable for this:
  dcl-calc-command-indent-multiple
  dcl-calc-command-indent-hang"
  :type '(choice (const nil) function)
  :group 'dcl)


(defcustom dcl-calc-cont-indent-function 'dcl-calc-cont-indent-relative
  "Function to calculate indentation for a continuation line.
If this variable is non-nil it is called as a function:

\(func CUR-INDENT EXTRA-INDENT)

The function must return the number of columns to indent the current line or
nil to get the default indentation.

If this variable is nil, the indentation is calculated as
CUR-INDENT + EXTRA-INDENT.

This package includes one function suitable for this:
  dcl-calc-cont-indent-relative"
  :type 'function
  :group 'dcl)


(defcustom dcl-tab-always-indent t
  "Controls the operation of the TAB key in DCL mode.
If t, pressing TAB always indents the current line.
If nil, pressing TAB indents the current line if point is at the left margin.
Data lines (i.e. lines not part of a command line or continuation line) are
never indented."
  :type 'boolean
  :group 'dcl)


(defcustom dcl-electric-characters t
  "Non-nil means reindent immediately when a label, ELSE or ENDIF is inserted."
  :type 'boolean
  :group 'dcl)


(defcustom dcl-tempo-comma ", "
  "Text to insert when a comma is needed in a template, in DCL mode."
  :type 'string
  :group 'dcl)

(defcustom dcl-tempo-left-paren "("
  "Text to insert when a left parenthesis is needed in a template in DCL."
  :type 'string
  :group 'dcl)


(defcustom dcl-tempo-right-paren ")"
  "Text to insert when a right parenthesis is needed in a template in DCL."
  :type 'string
  :group 'dcl)

; I couldn't decide what looked best, so I'll let you decide...
; Remember, you can also customize this with imenu-submenu-name-format.
(defcustom dcl-imenu-label-labels "Labels"
  "Imenu menu title for sub-listing with label names."
  :type 'string
  :group 'dcl)
(defcustom dcl-imenu-label-goto "GOTO"
  "Imenu menu title for sub-listing with GOTO statements."
  :type 'string
  :group 'dcl)
(defcustom dcl-imenu-label-gosub "GOSUB"
  "Imenu menu title for sub-listing with GOSUB statements."
  :type 'string
  :group 'dcl)
(defcustom dcl-imenu-label-call "CALL"
  "Imenu menu title for sub-listing with CALL statements."
  :type 'string
  :group 'dcl)

(defcustom dcl-imenu-generic-expression
  `((nil "^\\$[ \t]*\\([A-Za-z0-9_$]+\\):[ \t]+SUBROUTINE\\b" 1)
    (,dcl-imenu-label-labels
     "^\\$[ \t]*\\([A-Za-z0-9_$]+\\):\\([ \t]\\|$\\)" 1)
    (,dcl-imenu-label-goto "\\s-GOTO[ \t]+\\([A-Za-z0-9_$]+\\)" 1)
    (,dcl-imenu-label-gosub "\\s-GOSUB[ \t]+\\([A-Za-z0-9_$]+\\)" 1)
    (,dcl-imenu-label-call "\\s-CALL[ \t]+\\([A-Za-z0-9_$]+\\)" 1))
  "Default imenu generic expression for DCL.

The default includes SUBROUTINE labels in the main listing and
sub-listings for other labels, CALL, GOTO and GOSUB statements.
See `imenu-generic-expression' for details."
  :type '(repeat (sexp :tag "Imenu Expression"))
  :group 'dcl)


(defcustom dcl-mode-hook nil
  "Hook called by `dcl-mode'."
  :type 'hook
  :group 'dcl)


;;; *** Global variables ****************************************************


(defvar dcl-mode-syntax-table nil
  "Syntax table used in DCL-buffers.")
(unless dcl-mode-syntax-table
  (setq dcl-mode-syntax-table (make-syntax-table))
  (modify-syntax-entry ?!  "<" dcl-mode-syntax-table) ; comment start
  (modify-syntax-entry ?\n ">" dcl-mode-syntax-table) ; comment end
  (modify-syntax-entry ?< "(>" dcl-mode-syntax-table) ; < and ...
  (modify-syntax-entry ?> ")<" dcl-mode-syntax-table) ; > is a matching pair
  (modify-syntax-entry ?\\ "_" dcl-mode-syntax-table) ; not an escape
)


(defvar dcl-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map "\e\n"	'dcl-split-line)
    (define-key map "\e\t" 	'tempo-complete-tag)
    (define-key map "\e^"	'dcl-delete-indentation)
    (define-key map "\em"	'dcl-back-to-indentation)
    (define-key map "\ee"        'dcl-forward-command)
    (define-key map "\ea"        'dcl-backward-command)
    (define-key map "\e\C-q" 	'dcl-indent-command)
    (define-key map "\t"         'dcl-tab)
    (define-key map ":"          'dcl-electric-character)
    (define-key map "F"          'dcl-electric-character)
    (define-key map "f"          'dcl-electric-character)
    (define-key map "E"          'dcl-electric-character)
    (define-key map "e"          'dcl-electric-character)
    (define-key map "\C-c\C-o" 	'dcl-set-option)
    (define-key map "\C-c\C-f" 	'tempo-forward-mark)
    (define-key map "\C-c\C-b" 	'tempo-backward-mark)

    (define-key map [menu-bar] 	(make-sparse-keymap))
    (define-key map [menu-bar dcl]
      (cons "DCL" (make-sparse-keymap "DCL")))

    ;; Define these in bottom-up order
    (define-key map [menu-bar dcl tempo-backward-mark]
      '("Previous template mark" . tempo-backward-mark))
    (define-key map [menu-bar dcl tempo-forward-mark]
      '("Next template mark" . tempo-forward-mark))
    (define-key map [menu-bar dcl tempo-complete-tag]
      '("Complete template tag" . tempo-complete-tag))
    (define-key map [menu-bar dcl dcl-separator-tempo]
      '("--"))
    (define-key map [menu-bar dcl dcl-save-all-options]
      '("Save all options" . dcl-save-all-options))
    (define-key map [menu-bar dcl dcl-save-nondefault-options]
      '("Save changed options" . dcl-save-nondefault-options))
    (define-key map [menu-bar dcl dcl-set-option]
      '("Set option" . dcl-set-option))
    (define-key map [menu-bar dcl dcl-separator-option]
      '("--"))
    (define-key map [menu-bar dcl dcl-delete-indentation]
      '("Delete indentation" . dcl-delete-indentation))
    (define-key map [menu-bar dcl dcl-split-line]
      '("Split line" . dcl-split-line))
    (define-key map [menu-bar dcl dcl-indent-command]
      '("Indent command" . dcl-indent-command))
    (define-key map [menu-bar dcl dcl-tab]
      '("Indent line/insert tab" . dcl-tab))
    (define-key map [menu-bar dcl dcl-back-to-indentation]
      '("Back to indentation" . dcl-back-to-indentation))
    (define-key map [menu-bar dcl dcl-forward-command]
      '("End of statement" . dcl-forward-command))
    (define-key map [menu-bar dcl dcl-backward-command]
      '("Beginning of statement" . dcl-backward-command))
    ;; imenu is only supported for versions with imenu-generic-expression
    (if (boundp 'imenu-generic-expression)
        (progn
          (define-key map [menu-bar dcl dcl-separator-movement]
            '("--"))
          (define-key map [menu-bar dcl imenu]
            '("Buffer index menu" . imenu))))
    map)
  "Keymap used in DCL-mode buffers.")

(defcustom dcl-ws-r
  "\\([ \t]*-[ \t]*\\(!.*\\)*\n\\)*[ \t]*"
  "Regular expression describing white space in a DCL command line.
White space is any number of continued lines with only space,tab,endcomment
followed by space or tab."
  :type 'regexp
  :group 'dcl)


(defcustom dcl-label-r
  "[a-zA-Z0-9_$]*:\\([ \t!]\\|$\\)"
  "Regular expression describing a label.
A label is a name followed by a colon followed by white-space or end-of-line."
  :type 'regexp
  :group 'dcl)


(defcustom dcl-cmd-r
  "^\\$\\(.*-[ \t]*\\(!.*\\)*\n\\)*[^!\"\n]*\\(\".*\\(\"\".*\\)*\"\\)*[^!\"\n]*"
  "Regular expression describing a DCL command line up to a trailing comment.
A line starting with $, optionally followed by continuation lines,
followed by the end of the command line.
A continuation line is any characters followed by `-',
optionally followed by a comment, followed by a newline."
  :type 'regexp
  :group 'dcl)


(defcustom dcl-command-regexp
  "^\\$\\(.*-[ \t]*\\(!.*\\)*\n\\)*.*\\(\".*\\(\"\".*\\)*\"\\)*"
  "Regular expression describing a DCL command line.
A line starting with $, optionally followed by continuation lines,
followed by the end of the command line.
A continuation line is any characters followed by `-',
optionally followed by a comment, followed by a newline."
  :type 'regexp
  :group 'dcl)


(defcustom dcl-electric-reindent-regexps
  (list "endif" "else" dcl-label-r)
  "Regexps that can trigger an electric reindent.
A list of regexps that will trigger a reindent if the last letter
is defined as dcl-electric-character.

E.g.: if this list contains `endif', the key `f' is defined as
dcl-electric-character and you have just typed the `f' in
`endif', the line will be reindented."
  :type '(repeat regexp)
  :group 'dcl)


(defvar dcl-option-alist
  '((dcl-basic-offset dcl-option-value-basic)
    (dcl-continuation-offset curval)
    (dcl-margin-offset dcl-option-value-margin-offset)
    (dcl-margin-label-offset dcl-option-value-offset)
    (dcl-comment-line-regexp dcl-option-value-comment-line)
    (dcl-block-begin-regexp curval)
    (dcl-block-end-regexp curval)
    (dcl-tab-always-indent toggle)
    (dcl-electric-characters toggle)
    (dcl-electric-reindent-regexps curval)
    (dcl-tempo-comma curval)
    (dcl-tempo-left-paren curval)
    (dcl-tempo-right-paren curval)
    (dcl-calc-command-indent-function curval)
    (dcl-calc-cont-indent-function curval)
    (comment-start curval)
    (comment-start-skip curval)
    )
  "Options and default values for dcl-set-option.

An alist with option variables and functions or keywords to get a
default value for the option.

The keywords are:
curval       the current value
toggle       the opposite of the current value (for t/nil)")


(defvar dcl-option-history
  (mapcar (lambda (option-assoc)
	    (format "%s" (car option-assoc)))
	  dcl-option-alist)
  "The history list for dcl-set-option.
Preloaded with all known option names from dcl-option-alist")


;; Must be defined after dcl-cmd-r
;; This version is more correct but much slower than the one
;; above.  This version won't find GOTOs in comments or text strings.
;(defvar dcl-imenu-generic-expression
;  (`
;   ((nil "^\\$[ \t]*\\([A-Za-z0-9_$]+\\):[ \t]+SUBROUTINE\\b" 1)
;    ("Labels" "^\\$[ \t]*\\([A-Za-z0-9_$]+\\):\\([ \t]\\|$\\)" 1)
;    ("GOTO" (, (concat dcl-cmd-r "GOTO[ \t]+\\([A-Za-z0-9_$]+\\)")) 5)
;    ("GOSUB" (, (concat dcl-cmd-r
;			"GOSUB[ \t]+\\([A-Za-z0-9_$]+\\)")) 5)
;    ("CALL" (, (concat dcl-cmd-r "CALL[ \t]+\\([A-Za-z0-9_$]+\\)")) 5)))
;  "Default imenu generic expression for DCL.

;The default includes SUBROUTINE labels in the main listing and
;sub-listings for other labels, CALL, GOTO and GOSUB statements.
;See `imenu-generic-expression' in a recent (e.g. Emacs 19.30) imenu.el
;for details.")


;;; *** Mode initialization *************************************************


;;;###autoload
(define-derived-mode dcl-mode prog-mode "DCL"
  "Major mode for editing DCL-files.

This mode indents command lines in blocks.  (A block is commands between
THEN-ELSE-ENDIF and between lines matching dcl-block-begin-regexp and
dcl-block-end-regexp.)

Labels are indented to a fixed position unless they begin or end a block.
Whole-line comments (matching dcl-comment-line-regexp) are not indented.
Data lines are not indented.

Key bindings:

\\{dcl-mode-map}
Commands not usually bound to keys:

\\[dcl-save-nondefault-options]\t\tSave changed options
\\[dcl-save-all-options]\t\tSave all options
\\[dcl-save-option]\t\t\tSave any option
\\[dcl-save-mode]\t\t\tSave buffer mode

Variables controlling indentation style and extra features:

 dcl-basic-offset
    Extra indentation within blocks.

 dcl-continuation-offset
    Extra indentation for continued lines.

 dcl-margin-offset
    Indentation for the first command line in a file or SUBROUTINE.

 dcl-margin-label-offset
    Indentation for a label.

 dcl-comment-line-regexp
    Lines matching this regexp will not be indented.

 dcl-block-begin-regexp
 dcl-block-end-regexp
    Regexps that match command lines that begin and end, respectively,
    a block of command lines that will be given extra indentation.
    Command lines between THEN-ELSE-ENDIF are always indented; these variables
    make it possible to define other places to indent.
    Set to nil to disable this feature.

 dcl-calc-command-indent-function
    Can be set to a function that customizes indentation for command lines.
    Two such functions are included in the package:
	dcl-calc-command-indent-multiple
	dcl-calc-command-indent-hang

 dcl-calc-cont-indent-function
    Can be set to a function that customizes indentation for continued lines.
    One such function is included in the package:
	dcl-calc-cont-indent-relative    (set by default)

 dcl-tab-always-indent
    If t, pressing TAB always indents the current line.
    If nil, pressing TAB indents the current line if point is at the left
    margin.

 dcl-electric-characters
    Non-nil causes lines to be indented at once when a label, ELSE or ENDIF is
    typed.

 dcl-electric-reindent-regexps
    Use this variable and function dcl-electric-character to customize
    which words trigger electric indentation.

 dcl-tempo-comma
 dcl-tempo-left-paren
 dcl-tempo-right-paren
    These variables control the look of expanded templates.

 dcl-imenu-generic-expression
    Default value for imenu-generic-expression.  The default includes
    SUBROUTINE labels in the main listing and sub-listings for
    other labels, CALL, GOTO and GOSUB statements.

 dcl-imenu-label-labels
 dcl-imenu-label-goto
 dcl-imenu-label-gosub
 dcl-imenu-label-call
    Change the text that is used as sub-listing labels in imenu.

Loading this package calls the value of the variable
`dcl-mode-load-hook' with no args, if that value is non-nil.
Turning on DCL mode calls the value of the variable `dcl-mode-hook'
with no args, if that value is non-nil.


The following example uses the default values for all variables:

$! This is a comment line that is not indented (it matches
$! dcl-comment-line-regexp)
$! Next follows the first command line.  It is indented dcl-margin-offset.
$       i = 1
$       ! Other comments are indented like command lines.
$       ! A margin label indented dcl-margin-label-offset:
$ label:
$       if i.eq.1
$       then
$           ! Lines between THEN-ELSE and ELSE-ENDIF are
$           ! indented dcl-basic-offset
$           loop1: ! This matches dcl-block-begin-regexp...
$               ! ...so this line is indented dcl-basic-offset
$               text = \"This \" + - ! is a continued line
                       \"lined up with the command line\"
$               type sys$input
Data lines are not indented at all.
$           endloop1: ! This matches dcl-block-end-regexp
$       endif
$


There is some minimal font-lock support (see vars
`dcl-font-lock-defaults' and `dcl-font-lock-keywords')."
  (set (make-local-variable 'indent-line-function) 'dcl-indent-line)
  (set (make-local-variable 'comment-start) "!")
  (set (make-local-variable 'comment-end) "")
  (set (make-local-variable 'comment-multi-line) nil)

  ;; This used to be "^\\$[ \t]*![ \t]*" which looks more correct.
  ;; The drawback was that you couldn't make empty comment lines by pressing
  ;; C-M-j repeatedly - only the first line became a comment line.
  ;; This version has the drawback that the "$" can be anywhere in the line,
  ;; and something inappropriate might be interpreted as a comment.
  (set (make-local-variable 'comment-start-skip) "\\$[ \t]*![ \t]*")

  (if (boundp 'imenu-generic-expression)
      (progn (setq imenu-generic-expression dcl-imenu-generic-expression)
             (setq imenu-case-fold-search t)))
  (setq imenu-create-index-function 'dcl-imenu-create-index-function)

  (make-local-variable 'dcl-comment-line-regexp)
  (make-local-variable 'dcl-block-begin-regexp)
  (make-local-variable 'dcl-block-end-regexp)
  (make-local-variable 'dcl-basic-offset)
  (make-local-variable 'dcl-continuation-offset)
  (make-local-variable 'dcl-margin-label-offset)
  (make-local-variable 'dcl-margin-offset)
  (make-local-variable 'dcl-tab-always-indent)
  (make-local-variable 'dcl-electric-characters)
  (make-local-variable 'dcl-calc-command-indent-function)
  (make-local-variable 'dcl-calc-cont-indent-function)
  (make-local-variable 'dcl-electric-reindent-regexps)

  ;; font lock
  (set (make-local-variable 'font-lock-defaults) dcl-font-lock-defaults)

  (tempo-use-tag-list 'dcl-tempo-tags))


;;; *** Movement commands ***************************************************


;;;-------------------------------------------------------------------------
(defun dcl-beginning-of-statement ()
  "Go to the beginning of the preceding or current command line."
  (interactive)
  (re-search-backward dcl-command-regexp nil t))


;;;-------------------------------------------------------------------------
(defun dcl-end-of-statement ()
  "Go to the end of the next or current command line."
  (interactive)
  (if (or (dcl-end-of-command-p)
	  (dcl-beginning-of-command-p)
	  (not (dcl-command-p)))
      ()
    (dcl-beginning-of-statement))
  (re-search-forward dcl-command-regexp nil t))


;;;-------------------------------------------------------------------------
(defun dcl-beginning-of-command ()
  "Move point to beginning of current command."
  (interactive)
  (let ((type (dcl-get-line-type)))
    (if (and (eq type '$)
	     (bolp))
	() ; already in the correct position
      (dcl-beginning-of-statement))))


;;;-------------------------------------------------------------------------
(defun dcl-end-of-command ()
  "Move point to end of current command or next command if not on a command."
  (interactive)
  (let ((type (dcl-get-line-type)))
    (if (or (eq type '$)
	    (eq type '-))
	(progn
	  (dcl-beginning-of-command)
	  (dcl-end-of-statement))
      (dcl-end-of-statement))))


;;;-------------------------------------------------------------------------
(defun dcl-backward-command (&optional incl-comment-commands)
  "Move backward to a command.
Move point to the preceding command line that is not a comment line,
a command line with only a comment, only contains a `$' or only
contains a label.

Returns point of the found command line or nil if not able to move."
  (interactive)
  (let ((start (point))
	done
	retval)
    ;; Find first non-empty command line
    (while (not done)
      ;; back up one statement and look at the command
      (if (dcl-beginning-of-statement)
	  (cond
	   ((and dcl-block-begin-regexp ; might be nil
		 (looking-at (concat "^\\$" dcl-ws-r
				     dcl-block-begin-regexp)))
	    (setq done t retval (point)))
	   ((and dcl-block-end-regexp	; might be nil
		 (looking-at (concat "^\\$" dcl-ws-r
				     dcl-block-end-regexp)))
	    (setq done t retval (point)))
	   ((looking-at dcl-comment-line-regexp)
	    t)				; comment line, one more loop
	   ((and (not incl-comment-commands)
		 (looking-at "\\$[ \t]*!"))
	    t)				; comment only command, loop...
	   ((looking-at "^\\$[ \t]*$")
	    t)				; empty line, one more loop
	   ((not (looking-at
		  (concat "^\\$" dcl-ws-r dcl-label-r dcl-ws-r "$")))
	    (setq done t)		; not a label-only line, exit the loop
	    (setq retval (point))))
	;; We couldn't go further back, and we haven't found a command yet.
	;; Return to the start position.
	(goto-char start)
	(setq done t)
	(setq retval nil)))
    retval))


;;;-------------------------------------------------------------------------
(defun dcl-forward-command (&optional incl-comment-commands)
  "Move forward to a command.
Move point to the end of the next command line that is not a comment line,
a command line with only a comment, only contains a `$' or only
contains a label.

Returns point of the found command line or nil if not able to move."
  (interactive)
  (let ((start (point))
	done
	retval)
    ;; Find first non-empty command line
    (while (not done)
      ;; go forward one statement and look at the command
      (if (dcl-end-of-statement)
	  (save-excursion
	    (dcl-beginning-of-statement)
	    (cond
	     ((and dcl-block-begin-regexp ; might be nil
		   (looking-at (concat "^\\$" dcl-ws-r
				       dcl-block-begin-regexp)))
	      (setq done t)
	      (setq retval (point)))
	     ((and dcl-block-end-regexp	; might be nil
		   (looking-at (concat "^\\$" dcl-ws-r
				       dcl-block-end-regexp)))
	      (setq done t)
	      (setq retval (point)))
	     ((looking-at dcl-comment-line-regexp)
	      t)			; comment line, one more loop
	     ((and (not incl-comment-commands)
		   (looking-at "\\$[ \t]*!"))
	      t)			; comment only command, loop...
	     ((looking-at "^\\$[ \t]*$")
	      t)			; empty line, one more loop
	     ((not (looking-at
		    (concat "^\\$" dcl-ws-r dcl-label-r dcl-ws-r "$")))
	      (setq done t)		; not a label-only line, exit the loop
	      (setq retval (point)))))
	;; We couldn't go further back, and we haven't found a command yet.
	;; Return to the start position.
	(goto-char start)
	(setq done t)
	(setq retval nil)))
    retval))


;;;-------------------------------------------------------------------------
(defun dcl-back-to-indentation ()
  "Move point to the first non-whitespace character on this line.
Leading $ and labels counts as whitespace in this case.
If this is a comment line then move to the first non-whitespace character
in the comment.

Typing \\[dcl-back-to-indentation] several times in a row will move point to other
`interesting' points closer to the left margin, and then back to the
rightmost point again.

E.g. on the following line, point would go to the positions indicated
by the numbers in order 1-2-3-1-... :

  $ label: command
  3 2      1"
  (interactive)
  (if (eq last-command 'dcl-back-to-indentation)
      (dcl-back-to-indentation-1 (point))
    (dcl-back-to-indentation-1)))
(defun dcl-back-to-indentation-1 (&optional limit)
  "Helper function for `dcl-back-to-indentation'."

  ;; "Indentation points" that we will travel to
  ;;  $  l:  !  comment
  ;;  4  3   2  1
  ;;
  ;;  $  !  text
  ;;  3  2  1
  ;;
  ;;  $  l:  command  !
  ;;  3  2   1
  ;;
  ;;  text
  ;;  1

  (let* ((default-limit (1+ (line-end-position)))
	 (limit (or limit default-limit))
	 (last-good-point (point))
	 (opoint (point)))
    ;; Move over blanks
    (back-to-indentation)

    ;; If we already were at the outermost indentation point then we
    ;; start searching for the innermost point again.
    (if (= (point) opoint)
	(setq limit default-limit))

    (if (< (point) limit)
	(setq last-good-point (point)))

    (cond
     ;; Special treatment for comment lines.  We are trying to allow
     ;; things like "$ !*" as comment lines.
     ((looking-at dcl-comment-line-regexp)
      (re-search-forward (concat dcl-comment-line-regexp "[ \t]*") limit t)
      (if (< (point) limit)
	  (setq last-good-point (point))))

     ;; Normal command line
     ((looking-at "^\\$[ \t]*")
      ;; Move over leading "$" and blanks
      (re-search-forward "^\\$[ \t]*" limit t)
      (if (< (point) limit)
	  (setq last-good-point (point)))

      ;; Move over a label (if it isn't a block begin/end)
      ;; We must treat block begin/end labels as commands because
      ;; dcl-set-option relies on it.
      (if (and (looking-at dcl-label-r)
	       (not (or (and dcl-block-begin-regexp
			     (looking-at dcl-block-begin-regexp))
			(and dcl-block-end-regexp
			     (looking-at dcl-block-end-regexp)))))
	  (re-search-forward (concat dcl-label-r "[ \t]*") limit t))
      (if (< (point) limit)
	  (setq last-good-point (point)))

      ;; Move over the beginning of a comment
      (if (looking-at "![ \t]*")
	  (re-search-forward "![ \t]*" limit t))
      (if (< (point) limit)
	  (setq last-good-point (point)))))
    (goto-char last-good-point)))


;;; *** Support for indentation *********************************************


(defun dcl-get-line-type ()
  "Determine the type of the current line.
Returns one of the following symbols:
  $          for a complete command line or the beginning of a command line.
  -          for a continuation line
  $!         for a comment line
  data       for a data line
  empty-data for an empty line following a data line
  empty-$    for an empty line following a command line"
  (or
   ;; Check if it's a comment line.
   ;; A comment line starts with $!
   (save-excursion
    (beginning-of-line)
    (if (looking-at dcl-comment-line-regexp)
        '$!))
   ;; Check if it's a command line.
   ;; A command line starts with $
   (save-excursion
     (beginning-of-line)
     (if (looking-at "^\\$")
         '$))
   ;; Check if it's a continuation line
   (save-excursion
     (beginning-of-line)
     ;; If we're at the beginning of the buffer it can't be a continuation
     (if (bobp)
         ()
       (let ((opoint (point)))
         (dcl-beginning-of-statement)
         (re-search-forward dcl-command-regexp opoint t)
         (if (>= (point) opoint)
             '-))))
   ;; Empty lines might be different things
   (save-excursion
     (if (and (bolp) (eolp))
         (if (bobp)
             'empty-$
           (forward-line -1)
           (let ((type (dcl-get-line-type)))
             (cond
              ((or (equal type '$) (equal type '$!) (equal type '-))
               'empty-$)
              ((equal type 'data)
               'empty-data))))))
   ;; Anything else must be a data line
   (progn 'data)
   ))


;;;-------------------------------------------------------------------------
(defun dcl-indentation-point ()
  "Return point of first non-`whitespace' on this line."
  (save-excursion
    (dcl-back-to-indentation)
    (point)))


;;;---------------------------------------------------------------------------
(defun dcl-show-line-type ()
  "Test dcl-get-line-type."
  (interactive)
  (let ((type (dcl-get-line-type)))
    (cond
     ((equal type '$)
      (message "command line"))
     ((equal type '\?)
      (message "?"))
     ((equal type '$!)
      (message "comment line"))
     ((equal type '-)
      (message "continuation line"))
     ((equal type 'data)
      (message "data"))
     ((equal type 'empty-data)
      (message "empty-data"))
     ((equal type 'empty-$)
      (message "empty-$"))
     (t
      (message "hupp"))
     )))


;;; *** Perform indentation *************************************************


;;;---------------------------------------------------------------------------
(defun dcl-calc-command-indent-multiple
  (indent-type cur-indent extra-indent _last-point _this-point)
  "Indent lines to a multiple of dcl-basic-offset.

Set dcl-calc-command-indent-function to this function to customize
indentation of command lines.

Command lines that need to be indented beyond the left margin are
always indented to a column that is a multiple of dcl-basic-offset, as
if tab stops were set at 4, 8, 12, etc.

This supports a formatting style like this (dcl-margin offset = 2,
dcl-basic-offset = 4):

$ if cond
$ then
$   if cond
$   then
$       ! etc
"
  ;; calculate indentation if it's an interesting indent-type,
  ;; otherwise return nil to get the default indentation
  (let ((indent))
    (cond
     ((equal indent-type 'indent)
      (setq indent (- cur-indent (% cur-indent dcl-basic-offset)))
      (setq indent (+ indent extra-indent))))))


;;;---------------------------------------------------------------------------
;; Some people actually writes likes this.  To each his own...
(defun dcl-calc-command-indent-hang
  (indent-type cur-indent extra-indent last-point this-point)
  "Indent lines as default, but indent THEN, ELSE and ENDIF extra.

Set dcl-calc-command-indent-function to this function to customize
indentation of command lines.

This function supports a formatting style like this:

$ if cond
$   then
$     xxx
$   endif
$ xxx

If you use this function you will probably want to add \"then\" to
dcl-electric-reindent-regexps and define the key \"n\" as
dcl-electric-character.
"
  (let ((case-fold-search t))
    (save-excursion
      (cond
       ;; No indentation, this word is `then': +2
       ;; last word was endif: -2
       ((null indent-type)
	(or (progn
	      (goto-char this-point)
	      (if (looking-at "\\bthen\\b")
		  (+ cur-indent extra-indent 2)))
	    (progn
	      (goto-char last-point)
	      (if (looking-at "\\bendif\\b")
		  (- (+ cur-indent extra-indent) 2)))))
       ;; Indentation, last word was `then' or `else': -2
       ((equal indent-type 'indent)
	(goto-char last-point)
	(cond
	 ((looking-at "\\bthen\\b")
	  (- (+ cur-indent extra-indent) 2))
	 ((looking-at "\\belse\\b")
	  (- (+ cur-indent extra-indent) 2))))
       ;; Outdent, this word is `endif' or `else': + 2
       ((equal indent-type 'outdent)
	(goto-char this-point)
	(cond
	 ((looking-at "\\bendif\\b")
	  (+ cur-indent extra-indent 2))
	 ((looking-at "\\belse\\b")
	  (+ cur-indent extra-indent 2))))))))


;;;---------------------------------------------------------------------------
(defun dcl-calc-command-indent ()
  "Calculate how much the current line shall be indented.
The line is known to be a command line.

Find the indentation of the preceding line and analyze its contents to
see if the current lines should be indented.
Analyze the current line to see if it should be `outdented'.

Calculate the indentation of the current line, either with the default
method or by calling dcl-calc-command-indent-function if it is
non-nil.

If the current line should be outdented, calculate its indentation,
either with the default method or by calling
dcl-calc-command-indent-function if it is non-nil.


Rules for default indentation:

If it is the first line in the buffer, indent dcl-margin-offset.

Go to the previous command line with a command on it.
Find out how much it is indented (cur-indent).
Look at the first word on the line to see if the indentation should be
adjusted.  Skip margin-label, continuations and comments while looking for
the first word.  Save this buffer position as `last-point'.
If the first word after a label is SUBROUTINE, set extra-indent to
dcl-margin-offset.

First word  extra-indent
THEN        +dcl-basic-offset
ELSE        +dcl-basic-offset
block-begin +dcl-basic-offset

Then return to the current line and look at the first word to see if the
indentation should be adjusted again.  Save this buffer position as
`this-point'.

First word  extra-indent
ELSE        -dcl-basic-offset
ENDIF       -dcl-basic-offset
block-end   -dcl-basic-offset


If dcl-calc-command-indent-function is nil or returns nil set
cur-indent to cur-indent+extra-indent.

If an extra adjustment is necessary and if
dcl-calc-command-indent-function is nil or returns nil set cur-indent
to cur-indent+extra-indent.

See also documentation for dcl-calc-command-indent-function.
The indent-type classification could probably be expanded upon."
  ()
  (save-excursion
    (beginning-of-line)
    (let ((is-block nil)
	  (case-fold-search t)
	  cur-indent
	  (extra-indent 0)
	  indent-type last-point this-point extra-indent2 cur-indent2
	  indent-type2)
      (if (bobp)			; first line in buffer
	  (setq cur-indent 0 extra-indent dcl-margin-offset
		indent-type 'first-line
		this-point (dcl-indentation-point))
        (save-excursion
          (let (done)
	    ;; Find first non-empty command line
            (while (not done)
	      ;; back up one statement and look at the command
              (if (dcl-beginning-of-statement)
                  (cond
                   ((and dcl-block-begin-regexp ; might be nil
                         (looking-at (concat "^\\$" dcl-ws-r
                                             dcl-block-begin-regexp)))
                    (setq done t) (setq is-block t))
                   ((and dcl-block-end-regexp ; might be nil
                         (looking-at (concat "^\\$" dcl-ws-r
                                             dcl-block-end-regexp)))
                    (setq done t) (setq is-block t))
                   ((looking-at dcl-comment-line-regexp)
                    t) ; comment line, one more loop
                   ((looking-at "^\\$[ \t]*$")
                    t) ; empty line, one more loop
                   ((not (looking-at
                          (concat "^\\$" dcl-ws-r dcl-label-r dcl-ws-r "$")))
                    (setq done t))) ; not a label-only line, exit the loop
                ;; We couldn't go further back, so this must have been the
		;; first line.
                (setq cur-indent dcl-margin-offset
		      last-point (dcl-indentation-point))
                (setq done t)))
	    ;; Examine the line to get current indentation and possibly a
	    ;; reason to indent.
            (cond
             (cur-indent)
             ((looking-at (concat "^\\$[ \t]*" dcl-label-r dcl-ws-r
                                  "\\(subroutine\\b\\)"))
              (setq cur-indent dcl-margin-offset
		    last-point (1+ (match-beginning 1))))
             (t
              ;; Find out how much this line is indented.
              ;; Look at comment, continuation character, command but not label
              ;; unless it's a block.
              (if is-block
                  (re-search-forward "^\\$[ \t]*")
                (re-search-forward (concat "^\\$[ \t]*\\(" dcl-label-r
                                           "\\)*[ \t]*")))
              (setq cur-indent (current-column))
              ;; Look for a reason to indent: Find first word on this line
              (re-search-forward dcl-ws-r)
	      (setq last-point (point))
              (cond
               ((looking-at "\\bthen\\b")
                (setq extra-indent dcl-basic-offset indent-type 'indent))
               ((looking-at "\\belse\\b")
                (setq extra-indent dcl-basic-offset indent-type 'indent))
               ((and dcl-block-begin-regexp ; might be nil
                     (looking-at dcl-block-begin-regexp))
                (setq extra-indent dcl-basic-offset indent-type 'indent))
               ))))))
	(setq extra-indent2 0)
        ;; We're back at the beginning of the original line.
        ;; Look for a reason to outdent: Find first word on this line
        (re-search-forward (concat "^\\$" dcl-ws-r))
	(setq this-point (dcl-indentation-point))
        (cond
         ((looking-at "\\belse\\b")
          (setq extra-indent2 (- dcl-basic-offset) indent-type2 'outdent))
         ((looking-at "\\bendif\\b")
          (setq extra-indent2 (- dcl-basic-offset) indent-type2 'outdent))
         ((and dcl-block-end-regexp ; might be nil
               (looking-at dcl-block-end-regexp))
          (setq extra-indent2 (- dcl-basic-offset) indent-type2 'outdent))
         ((looking-at (concat dcl-label-r dcl-ws-r "\\(subroutine\\b\\)"))
          (setq cur-indent2 0 extra-indent2 dcl-margin-offset
		indent-type2 'first-line
		this-point (1+ (match-beginning 1)))))
	;; Calculate indent
	(setq cur-indent
	      (or (and dcl-calc-command-indent-function
		       (funcall dcl-calc-command-indent-function
				indent-type cur-indent extra-indent
				last-point this-point))
		  (+ cur-indent extra-indent)))
	;; Calculate outdent
	(if indent-type2
	    (progn
	      (or cur-indent2 (setq cur-indent2 cur-indent))
	      (setq cur-indent
		    (or (and dcl-calc-command-indent-function
			     (funcall dcl-calc-command-indent-function
				      indent-type2 cur-indent2 extra-indent2
				      last-point this-point))
			(+ cur-indent2 extra-indent2)))))
	cur-indent
        )))


;;;---------------------------------------------------------------------------
(defun dcl-calc-cont-indent-relative (_cur-indent _extra-indent)
  "Indent continuation lines to align with words on previous line.

Indent continuation lines to a position relative to preceding
significant command line elements.

Set `dcl-calc-cont-indent-function' to this function to customize
indentation of continuation lines.

Indented lines will align with either:

* the second word on the command line
  $ set default -
        [-]
* the word after an assignment
  $ a = b + -
        d
* the third word if it's a qualifier
  $ set terminal/width=80 -
                /page=24
* the innermost nonclosed parenthesis
  $ if ((a.eq.b .and. -
         d.eq.c .or. f$function(xxxx, -
                                yyy)))
"
  (let ((case-fold-search t)
	indent)
    (save-excursion
      (dcl-beginning-of-statement)
      (let ((end (save-excursion (forward-line 1) (point))))
	;; Move over blanks and label
	(if (re-search-forward (concat "^\\$[ \t]*\\(" dcl-label-r
				       "\\)*[ \t]*") end t)
	    (progn
	      ;; Move over the first word (might be `@filespec')
	      (if (> (skip-chars-forward "@:[]<>$\\-a-zA-Z0-9_.;" end) 0)
		  (let (was-assignment)
		    (skip-chars-forward " \t" end)
		    ;; skip over assignment if there is one
		    (if (looking-at ":?==?")
			(progn
			  (setq was-assignment t)
			  (skip-chars-forward " \t:=" end)))
		    ;; This could be the position to indent to
		    (setq indent (current-column))

		    ;; Move to the next word unless we have seen an
		    ;; assignment.  If it starts with `/' it's a
		    ;; qualifier and we will indent to that position
		    (if (and (not was-assignment)
			     (> (skip-chars-forward "a-zA-Z0-9_" end) 0))
			(progn
			  (skip-chars-forward " \t" end)
			  (if (= (char-after (point)) ?/)
			      (setq indent (current-column)))))
		    ))))))
    ;; Now check if there are any parenthesis to adjust to.
    ;; If there is, we will indent to the position after the last non-closed
    ;; opening parenthesis.
    (save-excursion
      (beginning-of-line)
      (let* ((start (save-excursion (dcl-beginning-of-statement) (point)))
	     (parse-sexp-ignore-comments t) ; for parse-partial
	     (par-pos (nth 1 (parse-partial-sexp start (point)))))
	(if par-pos		; is nil if no parenthesis was found
	    (setq indent (save-excursion
			   (goto-char par-pos)
			   (1+ (current-column)))))))
    indent))


;;;---------------------------------------------------------------------------
(defun dcl-calc-continuation-indent ()
  "Calculate how much the current line shall be indented.
The line is known to be a continuation line.

Go to the previous command line.
Find out how much it is indented."
;; This was copied without much thought from dcl-calc-command-indent, so
;; it's a bit clumsy.
  ()
  (save-excursion
    (beginning-of-line)
    (if (bobp)
	;; Huh? a continuation line first in the buffer??
        dcl-margin-offset
      (let ((is-block nil)
            (indent))
        (save-excursion
          ;; Find first non-empty command line
          (let ((done))
            (while (not done)
              (if (dcl-beginning-of-statement)
                  (cond
                   ((and dcl-block-begin-regexp
                         (looking-at (concat "^\\$" dcl-ws-r
                                             dcl-block-begin-regexp)))
                    (setq done t) (setq is-block t))
                   ((and dcl-block-end-regexp
                         (looking-at (concat "^\\$" dcl-ws-r
                                             dcl-block-end-regexp)))
                    (setq done t) (setq is-block t))
                   ((looking-at dcl-comment-line-regexp)
                    t)
                   ((looking-at "^\\$[ \t]*$")
                    t)
                   ((not (looking-at
                          (concat "^\\$" dcl-ws-r dcl-label-r dcl-ws-r "$")))
                    (setq done t)))
                ;; This must have been the first line.
                (setq indent dcl-margin-offset)
                (setq done t)))
            (if indent
                ()
              ;; Find out how much this line is indented.
              ;; Look at comment, continuation character, command but not label
              ;; unless it's a block.
              (if is-block
                  (re-search-forward "^\\$[ \t]*")
                (re-search-forward (concat "^\\$[ \t]*\\(" dcl-label-r
                                           "\\)*[ \t]*")))
              (setq indent (current-column))
              )))
          ;; We're back at the beginning of the original line.
	  (or (and dcl-calc-cont-indent-function
		   (funcall dcl-calc-cont-indent-function indent
			    dcl-continuation-offset))
	      (+ indent dcl-continuation-offset))
        ))))


;;;---------------------------------------------------------------------------
(defun dcl-indent-command-line ()
  "Indent a line known to be a command line."
  (let ((indent (dcl-calc-command-indent))
        (pos (- (point-max) (point))))
    (save-excursion
      (beginning-of-line)
      (re-search-forward "^\\$[ \t]*")
      ;; Indent any margin-label if the offset is set
      ;; (Don't look at block labels)
      (if (and dcl-margin-label-offset
               (looking-at dcl-label-r)
               (not (and dcl-block-begin-regexp
                         (looking-at dcl-block-begin-regexp)))
               (not (and dcl-block-end-regexp
                         (looking-at dcl-block-end-regexp))))
          (progn
            (dcl-indent-to dcl-margin-label-offset)
            (re-search-forward dcl-label-r)))
      (dcl-indent-to indent 1)
      )
    ;;
    (if (> (- (point-max) pos) (point))
        (goto-char (- (point-max) pos)))
    ))


;;;-------------------------------------------------------------------------
(defun dcl-indent-continuation-line ()
  "Indent a line known to be a continuation line.

Notice that no special treatment is made for labels.  They have to be
on the first part on a command line to be taken into consideration."
  (let ((indent (dcl-calc-continuation-indent)))
    (save-excursion
      (beginning-of-line)
      (re-search-forward "^[ \t]*")
      (dcl-indent-to indent))
    (skip-chars-forward " \t")))


;;;---------------------------------------------------------------------------
(defun dcl-delete-chars (chars)
  "Delete all characters in the set CHARS around point."
  (skip-chars-backward chars)
  (delete-region (point) (progn  (skip-chars-forward chars) (point))))


;;;---------------------------------------------------------------------------
(defun dcl-indent-line ()
  "The DCL version of `indent-line-function'.
Adjusts indentation on the current line.  Data lines are not indented."
  (let ((type (dcl-get-line-type)))
    (cond
     ((equal type '$)
      (dcl-indent-command-line))
     ((equal type '\?)
      (message "Unknown line type!"))
     ((equal type '$!))
     ((equal type 'data))
     ((equal type 'empty-data))
     ((equal type '-)
      (dcl-indent-continuation-line))
     ((equal type 'empty-$)
      (insert "$" )
      (dcl-indent-command-line))
     (t
      (message "dcl-indent-line: unknown type"))
     )))


;;;-------------------------------------------------------------------------
(defun dcl-indent-command ()
  "Indents the complete command line that point is on.
This includes continuation lines."
  (interactive "*")
  (let ((type (dcl-get-line-type)))
    (if (or (equal type '$)
	    (equal type '-)
	    (equal type 'empty-$))
	(save-excursion
	  (indent-region (progn (or (looking-at "^\\$")
				    (dcl-beginning-of-statement))
				(point))
			 (progn (dcl-end-of-statement) (point))
			 nil)))))


;;;-------------------------------------------------------------------------
(defun dcl-tab ()
  "Insert tab in data lines or indent code.
If `dcl-tab-always-indent' is t, code lines are always indented.
If nil, indent the current line only if point is at the left margin or in
the lines indentation; otherwise insert a tab."
  (interactive "*")
  (let ((type (dcl-get-line-type))
        (start-point (point)))
    (cond
     ;; Data line : always insert tab
     ((or (equal type 'data) (equal type 'empty-data))
      (tab-to-tab-stop))
     ;; Indent only at start of line
     ((not dcl-tab-always-indent)       ; nil
      (let ((search-end-point
             (save-excursion
               (beginning-of-line)
               (re-search-forward "^\\$?[ \t]*" start-point t))))
        (if (or (bolp)
                (and search-end-point
                     (>= search-end-point start-point)))
            (dcl-indent-line)
          (tab-to-tab-stop))))
      ;; Always indent
      ((eq dcl-tab-always-indent t)     ; t
      (dcl-indent-line))
     )))


;;;-------------------------------------------------------------------------
(defun dcl-electric-character (arg)
  "Inserts a character and indents if necessary.
Insert a character if the user gave a numeric argument or the flag
`dcl-electric-characters' is not set.  If an argument was given,
insert that many characters.

The line is only reindented if the word just typed matches any of the
regexps in `dcl-electric-reindent-regexps'."
  (interactive "*P")
  (if (or arg (not dcl-electric-characters))
      (if arg
          (self-insert-command (prefix-numeric-value arg))
        (self-insert-command 1))
    ;; Insert the character and indent
    (self-insert-command 1)
    (let ((case-fold-search t))
      ;; There must be a better way than (memq t ...).
      ;; (apply 'or ...) didn't work
      (if (memq t (mapcar 'dcl-was-looking-at dcl-electric-reindent-regexps))
          (dcl-indent-line)))))


;;;-------------------------------------------------------------------------
(defun dcl-indent-to (col &optional minimum)
  "Like `indent-to', but only indents if indentation would change."
  (interactive)
  (let (cur-indent collapsed indent)
    (save-excursion
      (skip-chars-forward " \t")
      (setq cur-indent (current-column))
      (skip-chars-backward " \t")
      (setq collapsed (current-column)))
    (setq indent (max col (+ collapsed (or minimum 0))))
    (if (/= indent cur-indent)
	(progn
	  (dcl-delete-chars " \t")
	  (indent-to col minimum)))))


;;;-------------------------------------------------------------------------
(defun dcl-split-line ()
  "Break line at point and insert text to keep the syntax valid.

Inserts continuation marks and splits character strings."
  ;; Still don't know what to do with comments at the end of a command line.
  (interactive "*")
  (let (done
	(type (dcl-get-line-type)))
    (cond
     ((or (equal type '$) (equal type '-))
      (let ((info (parse-partial-sexp
		   (save-excursion (dcl-beginning-of-statement) (point))
		   (point))))
	;; handle some special cases
	(cond
	 ((nth 3 info)			; in text constant
	  (insert "\" + -\n\"")
	  (indent-according-to-mode)
	  (setq done t))
	 ((not (nth 4 info))		; not in comment
	  (cond
	   ((and (not (eolp))
		 (= (char-after (point)) ?\")
		 (= (char-after (1- (point))) ?\"))
	    (progn			; a " "" " situation
	      (forward-char -1)
	      (insert "\" + -\n\"")
	      (forward-char 1)
	      (indent-according-to-mode)
	      (setq done t)))
	   ((and (dcl-was-looking-at "[ \t]*-[ \t]*") ; after cont mark
		 (looking-at "[ \t]*\\(!.*\\)?$"))
	    ;; Do default below.  This might considered wrong if we're
	    ;; after a subtraction:  $ x = 3 - <M-LFD>
	    )
	   (t
	    (delete-horizontal-space)
	    (insert " -")
	    (insert "\n") (indent-according-to-mode)
	    (setq done t))))
	 ))))
    ;; use the normal function for other cases
    (if (not done)			; normal M-LFD action
	(indent-new-comment-line))))


;;;-------------------------------------------------------------------------
(defun dcl-delete-indentation (&optional arg)
  "Join this line to previous like delete-indentation.
Also remove the continuation mark if easily detected."
  (interactive "*P")
  (delete-indentation arg)
  (let ((type (dcl-get-line-type)))
    (if (and (member type '($ - empty-$))
	     (not (bobp))
	     (= (char-before) ?-))
	(progn
	  (delete-char -1)
	  (fixup-whitespace)))))


;;; *** Set options *********************************************************


;;;-------------------------------------------------------------------------
(defun dcl-option-value-basic (_option-assoc)
  "Guess a value for basic-offset."
  (save-excursion
    (dcl-beginning-of-command)
    (let* (;; current lines indentation
	   (this-indent (save-excursion
			  (dcl-back-to-indentation)
			  (current-column)))
	   ;; previous lines indentation
	   (prev-indent (save-excursion
			  (if (dcl-backward-command)
			      (progn
				(dcl-back-to-indentation)
				(current-column)))))
	   (next-indent (save-excursion
			  (dcl-end-of-command)
			  (if (dcl-forward-command)
			      (progn
				(dcl-beginning-of-command)
				(dcl-back-to-indentation)
				(current-column)))))
	   (diff (if prev-indent
		     (abs (- this-indent prev-indent)))))
      (cond
       ((and diff
	     (/= diff 0))
	diff)
       ((and next-indent
	     (/= (- this-indent next-indent) 0))
	(abs (- this-indent next-indent)))
       (t
	dcl-basic-offset)))))


;;;-------------------------------------------------------------------------
(defun dcl-option-value-offset (_option-assoc)
  "Guess a value for an offset.
Find the column of the first non-blank character on the line.
Returns the column offset."
  (save-excursion
    (beginning-of-line)
    (re-search-forward "^\\$[ \t]*" nil t)
    (current-column)))


;;;-------------------------------------------------------------------------
(defun dcl-option-value-margin-offset (_option-assoc)
  "Guess a value for margin offset.
Find the column of the first non-blank character on the line, not
counting labels.
Returns a number as a string."
  (save-excursion
    (beginning-of-line)
    (dcl-back-to-indentation)
    (current-column)))


;;;-------------------------------------------------------------------------
(defun dcl-option-value-comment-line (_option-assoc)
  "Guess a value for `dcl-comment-line-regexp'.
Must return a string."
  ;; Should we set comment-start and comment-start-skip as well?
  ;; If someone wants `$!&' as a comment line, C-M-j won't work well if
  ;; they aren't set.
  ;; This must be done after the user has given the real value in
  ;; dcl-set-option.
  (format
   "%S"
   (save-excursion
     (beginning-of-line)
     ;; We could search for "^\\$.*!+[^ \t]*", but, as noted above, we
     ;; can't handle that case very good, so there is no point in
     ;; suggesting it.
     (if (looking-at "^\\$[^!\n]*!")
	 (let ((regexp (buffer-substring (match-beginning 0) (match-end 0))))
	   (concat "^" (regexp-quote regexp)))
       dcl-comment-line-regexp))))


;;;-------------------------------------------------------------------------
(defun dcl-guess-option-value (option)
  "Guess what value the user would like to give the symbol option."
  (let* ((option-assoc (assoc option dcl-option-alist))
	 (option (car option-assoc))
	 (action (car (cdr option-assoc)))
	 (value (cond
		 ((fboundp action)
		  (funcall action option-assoc))
		 ((eq action 'toggle)
		  (not (eval option)))
		 ((eq action 'curval)
		  (cond ((or (stringp (symbol-value option))
			     (numberp (symbol-value option)))
			 (format "%S" (symbol-value option)))
			(t
			 (format "'%S" (symbol-value option))))))))
    ;; format the value as a string if not already done
    (if (stringp value)
	value
      (format "%S" value))))


;;;-------------------------------------------------------------------------
(defun dcl-guess-option ()
  "Guess what option the user wants to set by looking around in the code.
Returns the name of the option variable as a string."
  (let ((case-fold-search t))
    (cond
     ;; Continued line
     ((eq (dcl-get-line-type) '-)
      "dcl-calc-cont-indent-function")
     ;; Comment line
     ((save-excursion
	(beginning-of-line)
	(looking-at "^\\$[ \t]*!"))
      "dcl-comment-line-regexp")
     ;; Margin offset: subroutine statement or first line in buffer
     ;; Test this before label indentation to detect a subroutine
     ((save-excursion
	(beginning-of-line)
	(or (looking-at (concat "^\\$[ \t]*" dcl-label-r dcl-ws-r
				"subroutine"))
	    (save-excursion
	      (not (dcl-backward-command t)))))
      "dcl-margin-offset")
     ;; Margin offset: on command line after subroutine statement
     ((save-excursion
	(beginning-of-line)
	(and (eq (dcl-get-line-type) '$)
	     (dcl-backward-command)
	     (looking-at (concat "^\\$[ \t]*" dcl-label-r dcl-ws-r
				 "subroutine"))))
      "dcl-margin-offset")
     ;; Label indentation
     ((save-excursion
	(beginning-of-line)
	(and (looking-at (concat "^\\$[ \t]*" dcl-label-r))
	     (not (and dcl-block-begin-regexp
		       (looking-at (concat "^\\$[ \t]*"
					   dcl-block-begin-regexp))))
	     (not (and dcl-block-end-regexp
		       (looking-at (concat "^\\$[ \t]*"
					   dcl-block-end-regexp))))))
      "dcl-margin-label-offset")
     ;; Basic offset
     ((and (eq (dcl-get-line-type) '$)	; beginning of command
	   (save-excursion
	     (beginning-of-line)
	     (let* ((this-indent (save-excursion
				   (dcl-back-to-indentation)
				   (current-column)))
		    (prev-indent (save-excursion
				   (if (dcl-backward-command)
				       (progn
					 (dcl-back-to-indentation)
					 (current-column)))))
		    (next-indent (save-excursion
				   (dcl-end-of-command)
				   (if (dcl-forward-command)
				       (progn
					 (dcl-beginning-of-command)
					 (dcl-back-to-indentation)
					 (current-column))))))
	       (or (and prev-indent	; last cmd is indented differently
			(/= (- this-indent prev-indent) 0))
		   (and next-indent
			(/= (- this-indent next-indent) 0))))))
      "dcl-basic-offset")
     ;; No more guesses.
     (t
      ""))))


;;;-------------------------------------------------------------------------
(defun dcl-set-option (option-sym option-value)
  "Set a value for one of the dcl customization variables.
The function tries to guess which variable should be set and to what value.
All variable names are available as completions and in the history list."
  (interactive
   (let* ((option-sym
	   (intern (completing-read
		    "Set DCL option: " ; prompt
		    (mapcar (function  ; alist of valid values
			     (lambda (option-assoc)
			       (cons  (format "%s" (car option-assoc)) nil)))
			    dcl-option-alist)
		    nil                   ; no predicate
		    t                     ; only value from the list OK
		    (dcl-guess-option)    ; initial (default) value
		    'dcl-option-history))) ; history list
	  (option-value
	   (eval-minibuffer
	    (format "Set DCL option %s to: " option-sym)
	    (dcl-guess-option-value option-sym))))
     (list option-sym option-value)))
  ;; Should make a sanity check on the symbol/value pair.
  ;; `set' instead of `setq' because we want option-sym to be evaluated.
  (set option-sym option-value))


;;; *** Save options ********************************************************


;;;-------------------------------------------------------------------------
(defun dcl-save-local-variable (var &optional def-prefix def-suffix)
  "Save a variable in a `Local Variables' list.
Set or update the value of VAR in the current buffers
`Local Variables:' list."
  ;; Look for "Local variables:" line in last page.
  (save-excursion
    (goto-char (point-max))
    (search-backward "\n\^L" (max (- (point-max)
                                     files--local-variables-search-distance)
                                  (point-min)) 'move)
    (if (let ((case-fold-search t))
	  (search-forward "Local Variables:" nil t))
	(let ((continue t)
	      prefix prefixlen suffix beg
	      prefix-string suffix-string)
	  ;; The prefix is what comes before "local variables:" in its line.
	  ;; The suffix is what comes after "local variables:" in its line.
	  (skip-chars-forward " \t")
	  (or (eolp)
	      (setq suffix-string (buffer-substring (point)
                                                    (line-end-position))))
	  (goto-char (match-beginning 0))
	  (or (bolp)
	      (setq prefix-string
		    (buffer-substring (point)
				      (progn (beginning-of-line) (point)))))

	  (if prefix-string (setq prefixlen (length prefix-string)
				  prefix (regexp-quote prefix-string)))
	  (if suffix-string (setq suffix (concat (regexp-quote suffix-string)
						 "$")))
	  (while continue
	    ;; Look at next local variable spec.
	    (if selective-display (re-search-forward "[\n\C-m]")
	      (forward-line 1))
	    ;; Skip the prefix, if any.
	    (if prefix
		(if (looking-at prefix)
		    (forward-char prefixlen)
		  (error "Local variables entry is missing the prefix")))
	    ;; Find the variable name; strip whitespace.
	    (skip-chars-forward " \t")
	    (setq beg (point))
	    (skip-chars-forward "^:\n")
	    (if (eolp) (error "Missing colon in local variables entry"))
	    (skip-chars-backward " \t")
	    (let* ((str (buffer-substring beg (point)))
		   (found-var (read str)))
	      ;; Setting variable named "end" means end of list.
	      (if (string-equal (downcase str) "end")
		  (progn
		    ;; Not found.  Insert a new entry before this line
		    (setq continue nil)
		    (beginning-of-line)
		    (insert (concat prefix-string (symbol-name var) ": "
				    (prin1-to-string (eval var)) " "
				    suffix-string "\n")))
		;; Is it the variable we are looking for?
		(if (eq var found-var)
		    (progn
		      ;; Found it: delete the variable value and insert the
		      ;; new value.
		      (setq continue nil)
		      (skip-chars-forward "^:")
		      (forward-char 1)
		      (delete-region (point) (progn (read (current-buffer))
						    (point)))
		      (insert " ")
		      (prin1 (eval var) (current-buffer))
		      (skip-chars-backward "\n")
		      (skip-chars-forward " \t")
		      (or (if suffix (looking-at suffix) (eolp))
			  (error
			   "Local variables entry is terminated incorrectly")))
		  (end-of-line))))))
      ;; Did not find "Local variables:"
      (goto-char (point-max))
      (if (not (bolp))
	  (insert "\n"))
      ;; If def- parameter not set, use comment- if set.  In that case, make
      ;; sure there is a space in a suitable position
      (let ((def-prefix
	      (cond
	       (def-prefix
		 def-prefix)
	       (comment-start
   		(if (or (equal comment-start "")
   			(string-match "[ \t]$" comment-start))
		    comment-start
		  (concat comment-start " ")))))
	    (def-suffix
	      (cond
	       (def-suffix
		 def-suffix)
	       (comment-end
		(if (or (equal comment-end "")
			(string-match "^[ \t]" comment-end))
		    comment-end
		  (concat " " comment-end))))))
	(insert (concat def-prefix "Local variables:" def-suffix "\n"))
	(insert (concat def-prefix (symbol-name var) ": "
			(prin1-to-string (eval var)) def-suffix "\n"))
	(insert (concat def-prefix "end:" def-suffix)))
      )))


;;;-------------------------------------------------------------------------
(defun dcl-save-all-options ()
  "Save all dcl-mode options for this buffer.
Saves or updates all dcl-mode related options in a `Local Variables:'
section at the end of the current buffer."
  (interactive "*")
  (mapcar (lambda (option-assoc)
	    (let* ((option (car option-assoc)))
	      (dcl-save-local-variable option "$! ")))
	  dcl-option-alist))


;;;-------------------------------------------------------------------------
(defun dcl-save-nondefault-options ()
  "Save changed DCL mode options for this buffer.
Saves or updates all DCL mode related options that don't have their
default values in a `Local Variables:' section at the end of the
current buffer.

No entries are removed from the `Local Variables:' section.  This means
that if a variable is given a non-default value in the section and
later is manually reset to its default value, the variable's entry will
still be present in the `Local Variables:' section with its old value."
  (interactive "*")
  (mapcar (lambda (option-assoc)
	    (let* ((option (car option-assoc))
		   (option-name (symbol-name option)))
	      (if (and (string-equal "dcl-"
				     (substring option-name 0 4))
		       (not (equal (default-value option) (eval option))))
		  (dcl-save-local-variable option "$! "))))
	  dcl-option-alist))


;;;-------------------------------------------------------------------------
(defun dcl-save-option (option)
  "Save a DCL mode option for this buffer.
Saves or updates an option in a `Local Variables:'
section at the end of the current buffer."
  (interactive
   (let ((option (intern (completing-read "Option: " obarray))))
     (list option)))
  (dcl-save-local-variable option))


;;;-------------------------------------------------------------------------
(with-no-warnings
  ;; Dynamically bound in `dcl-save-mode'.
  (defvar mode))

(defun dcl-save-mode ()
  "Save the current mode for this buffer.
Save the current mode in a `Local Variables:'
section at the end of the current buffer."
  (interactive)
  (let ((mode (prin1-to-string major-mode)))
    (if (string-match "-mode$" mode)
	(let ((mode (intern (substring mode 0 (match-beginning 0)))))
	  (dcl-save-option 'mode))
      (message "Strange mode: %s" mode))))


;;; *** Templates ***********************************************************
;; tempo seems to be the only suitable package among those included in
;; standard Emacs.  I would have liked something closer to the functionality
;; of LSE templates...

(defvar dcl-tempo-tags nil
  "Tempo tags for DCL mode.")

(tempo-define-template "dcl-f$context"
		       '("f$context" dcl-tempo-left-paren
			 (p "context-type: ") dcl-tempo-comma
			 (p "context-symbol: ") dcl-tempo-comma
			 (p "selection-item: ") dcl-tempo-comma
			 (p "selection-value: ") dcl-tempo-comma
			 (p "value-qualifier: ") dcl-tempo-right-paren)
		       "f$context" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$csid"
		       '("f$csid" dcl-tempo-left-paren
			 (p "context-symbol: ") dcl-tempo-right-paren)
		       "f$csid" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$cvsi"
		       '("f$cvsi" dcl-tempo-left-paren
			 (p "start-bit: ") dcl-tempo-comma
			 (p "number-of-bits: ") dcl-tempo-comma
			 (p "string: ") dcl-tempo-right-paren)
		       "f$cvsi" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$cvtime"
		       '("f$cvtime" dcl-tempo-left-paren
			 (p "[input_time]: ") dcl-tempo-comma
			 (p "[output_time_format]: ") dcl-tempo-comma
			 (p "[output_field]: ") dcl-tempo-right-paren)
		       "f$cvtime" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$cvui"
		       '("f$cvui" dcl-tempo-left-paren
			 (p "start-bit: ") dcl-tempo-comma
			 (p "number-of-bits: ") dcl-tempo-comma
			 (p "string") dcl-tempo-right-paren)
		       "f$cvui" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$device"
		       '("f$device" dcl-tempo-left-paren
			 (p "[search_devnam]: ") dcl-tempo-comma
			 (p "[devclass]: ") dcl-tempo-comma
			 (p "[devtype]: ") dcl-tempo-comma
			 (p "[stream-id]: ") dcl-tempo-right-paren)
		       "f$device" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$directory"
		       '("f$directory" dcl-tempo-left-paren
			 dcl-tempo-right-paren)
		       "f$directory" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$edit"
		       '("f$edit" dcl-tempo-left-paren
			 (p "string: ") dcl-tempo-comma
			 (p "edit-list: ") dcl-tempo-right-paren)
		       "f$edit" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$element"
		       '("f$element" dcl-tempo-left-paren
			 (p "element-number: ") dcl-tempo-comma
			 (p "delimiter: ") dcl-tempo-comma
			 (p "string: ") dcl-tempo-right-paren)
		       "f$element" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$environment"
		       '("f$environment" dcl-tempo-left-paren
			 (p "item: ") dcl-tempo-right-paren)
		       "f$environment" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$extract"
		       '("f$extract" dcl-tempo-left-paren
			 (p "start: ") dcl-tempo-comma
			 (p "length: ") dcl-tempo-comma
			 (p "string: ") dcl-tempo-right-paren)
		       "f$extract" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$fao"
		       '("f$fao" dcl-tempo-left-paren
			 (p "control-string: ") dcl-tempo-comma
			 ("argument[,...]: ") dcl-tempo-right-paren)
		       "f$fao" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$file_attributes"
		       '("f$file_attributes" dcl-tempo-left-paren
			 (p "filespec: ") dcl-tempo-comma
			 (p "item: ") dcl-tempo-right-paren)
		       "f$file_attributes" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$getdvi"
		       '("f$getdvi" dcl-tempo-left-paren
			 (p "device-name: ") dcl-tempo-comma
			 (p "item: ") dcl-tempo-right-paren)
		       "f$getdvi" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$getjpi"
		       '("f$getjpi" dcl-tempo-left-paren
			 (p "pid: ") dcl-tempo-comma
			 (p "item: ") dcl-tempo-right-paren )
		       "f$getjpi" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$getqui"
		       '("f$getqui" dcl-tempo-left-paren
			 (p "function: ") dcl-tempo-comma
			 (p "[item]: ") dcl-tempo-comma
			 (p "[object-id]: ") dcl-tempo-comma
			 (p "[flags]: ") dcl-tempo-right-paren)
		       "f$getqui" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$getsyi"
		       '("f$getsyi" dcl-tempo-left-paren
			 (p "item: ") dcl-tempo-comma
			 (p "[node-name]: ") dcl-tempo-comma
			 (p "[cluster-id]: ") dcl-tempo-right-paren)
		       "f$getsyi" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$identifier"
		       '("f$identifier" dcl-tempo-left-paren
			 (p "identifier: ") dcl-tempo-comma
			 (p "conversion-type: ") dcl-tempo-right-paren)
		       "f$identifier" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$integer"
		       '("f$integer" dcl-tempo-left-paren
			 (p "expression: ") dcl-tempo-right-paren)
		       "f$integer" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$length"
		       '("f$length" dcl-tempo-left-paren
			 (p "string: ") dcl-tempo-right-paren )
		       "f$length" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$locate"
		       '("f$locate" dcl-tempo-left-paren
			 (p "substring: ") dcl-tempo-comma
			 (p "string: ") dcl-tempo-right-paren)
		       "f$locate" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$message"
		       '("f$message" dcl-tempo-left-paren
			 (p "status-code: ") dcl-tempo-right-paren )
		       "f$message" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$mode"
		       '("f$mode" dcl-tempo-left-paren dcl-tempo-right-paren)
		       "f$mode" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$parse"
		       '("f$parse" dcl-tempo-left-paren
			 (p "filespec: ") dcl-tempo-comma
			 (p "[default-spec]: ") dcl-tempo-comma
			 (p "[related-spec]: ") dcl-tempo-comma
			 (p "[field]: ") dcl-tempo-comma
			 (p "[parse-type]: ") dcl-tempo-right-paren)
		       "f$parse" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$pid"
		       '("f$pid" dcl-tempo-left-paren
			 (p "context-symbol: ") dcl-tempo-right-paren)
		       "f$pid" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$privilege"
		       '("f$privilege" dcl-tempo-left-paren
			 (p "priv-states: ") dcl-tempo-right-paren)
		       "f$privilege" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$process"
		       '("f$process()")
		       "f$process" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$search"
		       '("f$search" dcl-tempo-left-paren
			 (p "filespec: ") dcl-tempo-comma
			 (p "[stream-id]: ") dcl-tempo-right-paren)
		       "f$search" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$setprv"
		       '("f$setprv" dcl-tempo-left-paren
			 (p "priv-states: ") dcl-tempo-right-paren)
		       "f$setprv" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$string"
		       '("f$string" dcl-tempo-left-paren
			 (p "expression: ") dcl-tempo-right-paren)
		       "f$string" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$time"
		       '("f$time" dcl-tempo-left-paren dcl-tempo-right-paren)
		       "f$time" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$trnlnm"
		       '("f$trnlnm" dcl-tempo-left-paren
			 (p "logical-name: ") dcl-tempo-comma
			 (p "[table]: ") dcl-tempo-comma
			 (p "[index]: ") dcl-tempo-comma
			 (p "[mode]: ") dcl-tempo-comma
			 (p "[case]: ") dcl-tempo-comma
			 (p "[item]: ") dcl-tempo-right-paren)
		       "f$trnlnm" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$type"
		       '("f$type" dcl-tempo-left-paren
			 (p "symbol-name: ") dcl-tempo-right-paren)
		       "f$type" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$user"
		       '("f$user" dcl-tempo-left-paren dcl-tempo-right-paren)
		       "f$user" "" 'dcl-tempo-tags)

(tempo-define-template "dcl-f$verify"
		       '("f$verify" dcl-tempo-left-paren
			 (p "[procedure-value]: ") dcl-tempo-comma
			 (p "[image-value]: ") dcl-tempo-right-paren)
		       "f$verify" "" 'dcl-tempo-tags)




;;; *** Unsorted stuff  *****************************************************


;;;-------------------------------------------------------------------------
(defun dcl-beginning-of-command-p ()
  "Return t if point is at the beginning of a command.
Otherwise return nil."
  (and (bolp)
       (eq (dcl-get-line-type) '$)))


;;;-------------------------------------------------------------------------
(defun dcl-end-of-command-p ()
  "Check if point is at the end of a command.
Return t if point is at the end of a command, either the end of an
only line or at the end of the last continuation line.
Otherwise return nil."
  ;; Must be at end-of-line on a command line or a continuation line
  (let ((type (dcl-get-line-type)))
    (if (and (eolp)
	     (or (eq type '$)
		 (eq type '-)))
	;; Next line must not be a continuation line
	(save-excursion
	  (forward-line)
	  (not (eq (dcl-get-line-type) '-))))))


;;;-------------------------------------------------------------------------
(defun dcl-command-p ()
  "Check if point is on a command line.
Return t if point is on a command line or a continuation line,
otherwise return nil."
  (let ((type (dcl-get-line-type)))
    (or (eq type '$)
	(eq type '-))))


;;;-------------------------------------------------------------------------
(defun dcl-was-looking-at (regexp)
  (save-excursion
    (let ((start (point))
          (found (re-search-backward regexp 0 t)))
      (if (not found)
          ()
        (equal start (match-end 0))))))

(declare-function imenu-default-create-index-function "imenu" ())

;;;-------------------------------------------------------------------------
(defun dcl-imenu-create-index-function ()
  "Jacket routine to make imenu searches non case sensitive."
  (let ((case-fold-search t))
    (imenu-default-create-index-function)))



;;; *** Epilogue ************************************************************


(provide 'dcl-mode)

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

;;; dcl-mode.el ends here

debug log:

solving 3d82d878bf3 ...
found 3d82d878bf3 in https://yhetil.org/emacs/87h7ygoulz.fsf@dima.secretsauce.net/
found ab3321f6868 in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 ab3321f6868369b00a59c09e00e14f34425709b7	lisp/progmodes/dcl-mode.el

applying [1/1] https://yhetil.org/emacs/87h7ygoulz.fsf@dima.secretsauce.net/
diff --git a/lisp/progmodes/dcl-mode.el b/lisp/progmodes/dcl-mode.el
index ab3321f6868..3d82d878bf3 100644

Checking patch lisp/progmodes/dcl-mode.el...
Applied patch lisp/progmodes/dcl-mode.el cleanly.

index at:
100644 3d82d878bf304f23370ad16f63c8049dd51a6684	lisp/progmodes/dcl-mode.el

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

Code repositories for project(s) associated with this external index

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

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.