all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob 8a7e24e5ada209a40243a3fff15dd1027e12af63 74777 bytes (raw)
name: lisp/progmodes/octave.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
 
;;; octave.el --- editing octave source files under emacs  -*- lexical-binding: t; -*-

;; Copyright (C) 1997, 2001-2019 Free Software Foundation, Inc.

;; Author: Kurt Hornik <Kurt.Hornik@wu-wien.ac.at>
;;	   John Eaton <jwe@octave.org>
;; Maintainer: emacs-devel@gnu.org
;; Keywords: 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:

;; This package provides Emacs support for Octave.  It defines a major
;; mode for editing Octave code and contains code for interacting with
;; an inferior Octave process using comint.

;; See the documentation of `octave-mode' and `run-octave' for further
;; information on usage and customization.

;;; Code:
(require 'comint)

(defgroup octave nil
  "Editing Octave code."
  :link '(custom-manual "(octave-mode)Top")
  :link '(url-link "https://www.gnu.org/s/octave")
  :link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
  :group 'languages)

(define-obsolete-function-alias 'octave-submit-bug-report
  'report-emacs-bug "24.4")

(define-abbrev-table 'octave-abbrev-table nil
  "Abbrev table for Octave's reserved words.
Used in `octave-mode' and `inferior-octave-mode' buffers.")

(defvar octave-comment-char ?#
  "Character to start an Octave comment.")

(defvar octave-comment-start (char-to-string octave-comment-char)
  "Octave-specific `comment-start' (which see).")

(defvar octave-comment-start-skip "\\(^\\|\\S<\\)\\(?:%!\\|\\s<+\\)\\s-*"
  "Octave-specific `comment-start-skip' (which see).")

(defvar octave-function-header-regexp
  (concat "^\\s-*\\_<\\(function\\)\\_>"
	  "\\([^=;(\n]*=[ \t]*\\|[ \t]*\\)\\(\\(?:\\w\\|\\s_\\)+\\)\\_>")
  "Regexp to match an Octave function header.
The string `function' and its name are given by the first and third
parenthetical grouping.")

\f
(defvar octave-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map "\M-."     'octave-find-definition)
    (define-key map "\M-\C-j"  'octave-indent-new-comment-line)
    (define-key map "\C-c\C-p" 'octave-previous-code-line)
    (define-key map "\C-c\C-n" 'octave-next-code-line)
    (define-key map "\C-c\C-a" 'octave-beginning-of-line)
    (define-key map "\C-c\C-e" 'octave-end-of-line)
    (define-key map [remap down-list] 'smie-down-list)
    (define-key map "\C-c\M-\C-h" 'octave-mark-block)
    (define-key map "\C-c]" 'smie-close-block)
    (define-key map "\C-c/" 'smie-close-block)
    (define-key map "\C-c;" 'octave-update-function-file-comment)
    (define-key map "\C-hd" 'octave-help)
    (define-key map "\C-ha" 'octave-lookfor)
    (define-key map "\C-c\C-l" 'octave-source-file)
    (define-key map "\C-c\C-f" 'octave-insert-defun)
    (define-key map "\C-c\C-il" 'octave-send-line)
    (define-key map "\C-c\C-ib" 'octave-send-block)
    (define-key map "\C-c\C-if" 'octave-send-defun)
    (define-key map "\C-c\C-ir" 'octave-send-region)
    (define-key map "\C-c\C-ia" 'octave-send-buffer)
    (define-key map "\C-c\C-is" 'octave-show-process-buffer)
    (define-key map "\C-c\C-iq" 'octave-hide-process-buffer)
    (define-key map "\C-c\C-ik" 'octave-kill-process)
    (define-key map "\C-c\C-i\C-l" 'octave-send-line)
    (define-key map "\C-c\C-i\C-b" 'octave-send-block)
    (define-key map "\C-c\C-i\C-f" 'octave-send-defun)
    (define-key map "\C-c\C-i\C-r" 'octave-send-region)
    (define-key map "\C-c\C-i\C-a" 'octave-send-buffer)
    (define-key map "\C-c\C-i\C-s" 'octave-show-process-buffer)
    (define-key map "\C-c\C-i\C-q" 'octave-hide-process-buffer)
    (define-key map "\C-c\C-i\C-k" 'octave-kill-process)
    map)
  "Keymap used in Octave mode.")



(easy-menu-define octave-mode-menu octave-mode-map
  "Menu for Octave mode."
  '("Octave"
    ["Split Line at Point"          octave-indent-new-comment-line t]
    ["Previous Code Line"           octave-previous-code-line t]
    ["Next Code Line"               octave-next-code-line t]
    ["Begin of Line"                octave-beginning-of-line t]
    ["End of Line"                  octave-end-of-line t]
    ["Mark Block"                   octave-mark-block t]
    ["Close Block"                  smie-close-block t]
    "---"
    ["Start Octave Process"         run-octave t]
    ["Documentation Lookup"         info-lookup-symbol t]
    ["Help on Function"             octave-help t]
    ["Search help"                  octave-lookfor t]
    ["Find Function Definition"     octave-find-definition t]
    ["Insert Function"              octave-insert-defun t]
    ["Update Function File Comment" octave-update-function-file-comment t]
    "---"
    ["Function Syntax Hints" (eldoc-mode 'toggle)
     :style toggle :selected (bound-and-true-p eldoc-mode)
     :help "Display function signatures after typing `SPC' or `('"]
    ["Delimiter Matching"           show-paren-mode
     :style toggle :selected show-paren-mode
     :help "Highlight matched pairs such as `if ... end'"
     :visible (fboundp 'smie--matching-block-data)]
    ["Auto Fill"                    auto-fill-mode
     :style toggle :selected auto-fill-function
     :help "Automatic line breaking"]
    ["Electric Layout"              electric-layout-mode
     :style toggle :selected electric-layout-mode
     :help "Automatically insert newlines around some chars"]
    "---"
    ("Debug"
     ["Send Current Line"       octave-send-line t]
     ["Send Current Block"      octave-send-block t]
     ["Send Current Function"   octave-send-defun t]
     ["Send Region"             octave-send-region t]
     ["Send Buffer"             octave-send-buffer t]
     ["Source Current File"     octave-source-file t]
     ["Show Process Buffer"     octave-show-process-buffer t]
     ["Hide Process Buffer"     octave-hide-process-buffer t]
     ["Kill Process"            octave-kill-process t])
    "---"
    ["Octave Mode Manual"       (info "(octave-mode)Top") t]
    ["Customize Octave"         (customize-group 'octave) t]
    ["Submit Bug Report"        report-emacs-bug t]))

(defvar octave-mode-syntax-table
  (let ((table (make-syntax-table)))
    (modify-syntax-entry ?\r " "  table)
    (modify-syntax-entry ?+ "."   table)
    (modify-syntax-entry ?- "."   table)
    (modify-syntax-entry ?= "."   table)
    (modify-syntax-entry ?* "."   table)
    (modify-syntax-entry ?/ "."   table)
    (modify-syntax-entry ?> "."   table)
    (modify-syntax-entry ?< "."   table)
    (modify-syntax-entry ?& "."   table)
    (modify-syntax-entry ?| "."   table)
    (modify-syntax-entry ?! "."   table)
    (modify-syntax-entry ?\\ "."  table)
    (modify-syntax-entry ?\' "."  table)
    (modify-syntax-entry ?\` "."  table)
    (modify-syntax-entry ?. "."   table)
    (modify-syntax-entry ?\" "\"" table)
    (modify-syntax-entry ?_ "_"   table)
    ;; The "b" flag only applies to the second letter of the comstart and
    ;; the first letter of the comend, i.e. a "4b" below would be ineffective.
    ;; If we try to put `b' on the single-line comments, we get a similar
    ;; problem where the % and # chars appear as first chars of the 2-char
    ;; comend, so the multi-line ender is also turned into style-b.
    ;; So we need the new "c" comment style.
    (modify-syntax-entry ?\% "< 13"  table)
    (modify-syntax-entry ?\# "< 13"  table)
    (modify-syntax-entry ?\{ "(} 2c"  table)
    (modify-syntax-entry ?\} "){ 4c"  table)
    (modify-syntax-entry ?\n ">"  table)
    table)
  "Syntax table in use in `octave-mode' buffers.")

(defcustom octave-font-lock-texinfo-comment t
  "Control whether to highlight the texinfo comment block."
  :type 'boolean
  :version "24.4")

(defcustom octave-blink-matching-block t
  "Control the blinking of matching Octave block keywords.
Non-nil means show matching begin of block when inserting a space,
newline or semicolon after an else or end keyword."
  :type 'boolean)

(defcustom octave-block-offset 2
  "Extra indentation applied to statements in Octave block structures."
  :type 'integer)

(defvar octave-block-comment-start
  (concat (make-string 2 octave-comment-char) " ")
  "String to insert to start a new Octave comment on an empty line.")

(defcustom octave-continuation-offset 4
  "Extra indentation applied to Octave continuation lines."
  :type 'integer)

(eval-and-compile
  (defconst octave-continuation-marker-regexp "\\\\\\|\\.\\.\\."))

(defvar octave-continuation-regexp
  (concat "[^#%\n]*\\(" octave-continuation-marker-regexp
          "\\)\\s-*\\(\\s<.*\\)?$"))

;; Char \ is considered a bad decision for continuing a line.
(defconst octave-continuation-string "..."
  "Character string used for Octave continuation lines.")

(defvar octave-mode-imenu-generic-expression
  (list
   ;; Functions
   (list nil octave-function-header-regexp 3))
  "Imenu expression for Octave mode.  See `imenu-generic-expression'.")

(defcustom octave-mode-hook nil
  "Hook to be run when Octave mode is started."
  :type 'hook)

(defcustom octave-send-show-buffer t
  "Non-nil means display `inferior-octave-buffer' after sending to it."
  :type 'boolean)

(defcustom octave-send-line-auto-forward t
  "Control auto-forward after sending to the inferior Octave process.
Non-nil means always go to the next Octave code line after sending."
  :type 'boolean)

(defcustom octave-send-echo-input t
  "Non-nil means echo input sent to the inferior Octave process."
  :type 'boolean)

\f
;;; SMIE indentation

(require 'smie)

(let-when-compile
    ((operator-table
      ;; Use '__operators__' in Octave REPL to get a full list?
      '((assoc ";" "\n") (assoc ",") ;The doc says they have equal precedence!?
        (right "=" "+=" "-=" "*=" "/=")
        (assoc "&&") (assoc "||") ; The doc claims they have equal precedence!?
        (assoc "&") (assoc "|") ; The doc claims they have equal precedence!?
        (nonassoc "<" "<=" "==" ">=" ">" "!=" "~=")
        (nonassoc ":")                  ;No idea what this is.
        (assoc "+" "-")
        (assoc "*" "/" "\\" ".\\" ".*" "./")
        (nonassoc "'" ".'")
        (nonassoc "++" "--" "!" "~")    ;And unary "+" and "-".
        (right "^" "**" ".^" ".**")
        ;; It's not really an operator, but for indentation purposes it
        ;; could be convenient to treat it as one.
        (assoc "...")))

     (matchedrules
      ;; We can't distinguish the first element in a sequence with
      ;; precedence grammars, so we can't distinguish the condition
      ;; of the `if' from the subsequent body, for example.
      ;; This has to be done later in the indentation rules.
      '(("try" exp "catch" exp "end_try_catch")
        ("unwind_protect" exp
         "unwind_protect_cleanup" exp "end_unwind_protect")
        ("for" exp "endfor")
        ("parfor" exp "endparfor")
        ("while" exp "endwhile")
        ("if" exp "endif")
        ("if" exp "else" exp "endif")
        ("if" exp "elseif" exp "else" exp "endif")
        ("if" exp "elseif" exp "elseif" exp "else" exp "endif")
        ("switch" exp "case" exp "endswitch")
        ("switch" exp "case" exp "otherwise" exp "endswitch")
        ("switch" exp "case" exp "case" exp "otherwise" exp "endswitch")
        ("function" exp "endfunction")
        ("enumeration" exp "endenumeration")
        ("events" exp "endevents")
        ("methods" exp "endmethods")
        ("properties" exp "endproperties")
        ("classdef" exp "endclassdef")
        ))

     (bnf-table
      `((atom)
        ;; FIXME: We don't parse these declarations correctly since
        ;; SMIE *really* likes to parse "a b = 2 c" as "(a b) = (2 c)".
        ;; IOW to do it right, we'd need to change octave-smie-*ward-token
        ;; so that the spaces between vars in var-decls are lexed as
        ;; something like ",".
        ;; Doesn't seem worth the trouble/slowdown for now.
        ;; We could hack smie-rules so as to work around the bad parse,
        ;; but even that doesn't seem worth the trouble.
        (var-decls (atom "=" atom)) ;; (var-decls "," var-decls)
        (single-exp (atom "=" atom))
        (exp (exp "\n" exp)
             ;; We need to mention at least one of the operators in this part
             ;; of the grammar: if the BNF and the operator table have
             ;; no overlap, SMIE can't know how they relate.
             (exp ";" exp)
             ("do" exp "until" single-exp)
             ,@matchedrules
           ;; For every rule that ends in "endfoo", add a corresponding
           ;; rule which uses "end" instead.
           ,@(mapcar (lambda (rule) (nconc (butlast rule) '("end")))
                     matchedrules)
           ("global" var-decls) ("persistent" var-decls)
           ;; These aren't super-important, but having them here
           ;; makes it easier to extract all keywords.
           ("break") ("continue") ("return")
           ;; The following rules do not correspond to valid code AFAIK,
           ;; but they lead to a grammar that degrades more gracefully
           ;; on incomplete/incorrect code.  It also helps us in
           ;; computing octave--block-offset-keywords.
           ("try" exp "end") ("unwind_protect" exp "end")
           )
      ;; (fundesc (atom "=" atom))
      )))

(defconst octave-smie-grammar
  (eval-when-compile
    (smie-prec2->grammar
     (smie-merge-prec2s
      (smie-bnf->prec2 bnf-table '((assoc "\n" ";")))
      (smie-precs->prec2 operator-table)))))

(defconst octave-operator-regexp
  (eval-when-compile
    (regexp-opt (remove "\n" (apply #'append
                                    (mapcar #'cdr operator-table)))))))

;; Tokenizing needs to be refined so that ";;" is treated as two
;; tokens and also so as to recognize the \n separator (and
;; corresponding continuation lines).

(defun octave-smie--funcall-p ()
  "Return non-nil if we're in an expression context.  Moves point."
  (looking-at "[ \t]*("))

(defun octave-smie--end-index-p ()
  (let ((ppss (syntax-ppss)))
    (and (nth 1 ppss)
         (memq (char-after (nth 1 ppss)) '(?\( ?\[ ?\{)))))

(defun octave-smie--in-parens-p ()
  (let ((ppss (syntax-ppss)))
    (and (nth 1 ppss)
         (eq ?\( (char-after (nth 1 ppss))))))

(defun octave-smie-backward-token ()
  (let ((pos (point)))
    (forward-comment (- (point)))
    (cond
     ((and (not (eq (char-before) ?\;)) ;Coalesce ";" and "\n".
           (> pos (line-end-position))
           (if (looking-back octave-continuation-marker-regexp (- (point) 3))
               (progn
                 (goto-char (match-beginning 0))
                 (forward-comment (- (point)))
                 nil)
             t)
           (not (octave-smie--in-parens-p)))
      (skip-chars-forward " \t")
      ;; Why bother distinguishing \n and ;?
      ";") ;;"\n"
     ((and (looking-back octave-operator-regexp (- (point) 3) 'greedy)
           ;; Don't mistake a string quote for a transpose.
           (not (looking-back "\\s\"" (1- (point)))))
      (goto-char (match-beginning 0))
      (match-string-no-properties 0))
     (t
      (let ((tok (smie-default-backward-token)))
        (cond
         ((equal tok "enumeration")
          (if (save-excursion (smie-default-forward-token)
                              (octave-smie--funcall-p))
              "enumeration (function)"
            tok))
         ((equal tok "end") (if (octave-smie--end-index-p) "end (index)" tok))
         (t tok)))))))

(defun octave-smie-forward-token ()
  (skip-chars-forward " \t")
  (when (looking-at (eval-when-compile
                      (concat "\\(" octave-continuation-marker-regexp
                              "\\)[ \t]*\\($\\|[%#]\\)")))
    (goto-char (match-end 1))
    (forward-comment 1))
  (cond
   ((and (looking-at "[%#\n]")
         (not (or (save-excursion (skip-chars-backward " \t")
                                  ;; Only add implicit ; when needed.
                                  (or (bolp) (eq (char-before) ?\;)))
                  (octave-smie--in-parens-p))))
    (if (eolp) (forward-char 1) (forward-comment 1))
    ;; Why bother distinguishing \n and ;?
    ";") ;;"\n"
   ((progn (forward-comment (point-max)) nil))
   ((looking-at ";[ \t]*\\($\\|[%#]\\)")
    ;; Combine the ; with the subsequent \n.
    (goto-char (match-beginning 1))
    (forward-comment 1)
    ";")
   ((and (looking-at octave-operator-regexp)
         ;; Don't mistake a string quote for a transpose.
         (not (looking-at "\\s\"")))
    (goto-char (match-end 0))
    (match-string-no-properties 0))
   (t
    (let ((tok (smie-default-forward-token)))
      (cond
       ((equal tok "enumeration")
        (if (octave-smie--funcall-p)
            "enumeration (function)"
          tok))
       ((equal tok "end") (if (octave-smie--end-index-p) "end (index)" tok))
       (t tok))))))

(defconst octave--block-offset-keywords
  (let* ((end-prec (nth 1 (assoc "end" octave-smie-grammar)))
         (end-matchers
          (delq nil
                (mapcar (lambda (x) (if (eq end-prec (nth 2 x)) (car x)))
                        octave-smie-grammar))))
    ;; Not sure if it would harm to keep "switch", but the previous code
    ;; excluded it, presumably because there shouldn't be any code on
    ;; the lines between "switch" and "case".
    (delete "switch" end-matchers)))

(defun octave-smie-rules (kind token)
  (pcase (cons kind token)
    ;; We could set smie-indent-basic instead, but that would have two
    ;; disadvantages:
    ;; - changes to octave-block-offset wouldn't take effect immediately.
    ;; - edebug wouldn't show the use of this variable.
    ('(:elem . basic) octave-block-offset)
    (`(:list-intro . ,(or "global" "persistent")) t)
    ;; Since "case" is in the same BNF rules as switch..end, SMIE by default
    ;; aligns it with "switch".
    ('(:before . "case") (if (not (smie-rule-sibling-p)) octave-block-offset))
    ('(:after . ";")
     (if (apply #'smie-rule-parent-p octave--block-offset-keywords)
         (smie-rule-parent octave-block-offset)
       ;; For (invalid) code between switch and case.
       ;; (if (smie-rule-parent-p "switch") 4)
       nil))))

(defun octave-indent-comment ()
  "A function for `smie-indent-functions' (which see)."
  (save-excursion
    (back-to-indentation)
    (cond
     ((octave-in-string-or-comment-p) nil)
     ((looking-at-p "\\(\\s<\\)\\1\\{2,\\}")
      0)
     ;; Exclude %{, %} and %!.
     ((and (looking-at-p "\\s<\\(?:[^{}!]\\|$\\)")
           (not (looking-at-p "\\(\\s<\\)\\1")))
      (comment-choose-indent)))))

\f
(defvar octave-reserved-words
  (delq nil
        (mapcar (lambda (x)
                  (setq x (car x))
                  (and (stringp x) (string-match "\\`[[:alpha:]]" x) x))
                octave-smie-grammar))
  "Reserved words in Octave.")

(defvar octave-font-lock-keywords
  (list
   ;; Fontify all builtin keywords.
   (cons (concat "\\_<" (regexp-opt octave-reserved-words) "\\_>")
         'font-lock-keyword-face)
   ;; Note: 'end' also serves as the last index in an indexing expression,
   ;; and 'enumerate' is also a function.
   ;; Ref: http://www.mathworks.com/help/matlab/ref/end.html
   ;; Ref: http://www.mathworks.com/help/matlab/ref/enumeration.html
   (list (lambda (limit)
           (while (re-search-forward "\\_<en\\(?:d\\|umeratio\\(n\\)\\)\\_>"
                                     limit 'move)
             (let ((beg (match-beginning 0))
                   (end (match-end 0)))
               (unless (octave-in-string-or-comment-p)
                 (when (if (match-end 1)
                           (octave-smie--funcall-p)
                         (octave-smie--end-index-p))
                   (put-text-property beg end 'face nil)))))
           nil))
   ;; Fontify all operators.
   (cons octave-operator-regexp 'font-lock-builtin-face)
   ;; Fontify all function declarations.
   (list octave-function-header-regexp
         '(1 font-lock-keyword-face)
         '(3 font-lock-function-name-face nil t)))
  "Additional Octave expressions to highlight.")

(defun octave-syntax-propertize-function (start end)
  (goto-char start)
  (octave-syntax-propertize-sqs end)
  (funcall (syntax-propertize-rules
            ("\\\\" (0 (when (eq (nth 3 (save-excursion
                                          (syntax-ppss (match-beginning 0))))
                                 ?\")
                         (string-to-syntax "\\"))))
            ;; Try to distinguish the string-quotes from the transpose-quotes.
            ("\\(?:^\\|[[({,; ]\\)\\('\\)"
             (1 (prog1 "\"'" (octave-syntax-propertize-sqs end)))))
           (point) end))

(defun octave-syntax-propertize-sqs (end)
  "Propertize the content/end of single-quote strings."
  (when (eq (nth 3 (syntax-ppss)) ?\')
    ;; A '..' string.
    (when (re-search-forward
           "\\(?:\\=\\|[^']\\)\\(?:''\\)*\\('\\)\\($\\|[^']\\)" end 'move)
      (goto-char (match-beginning 2))
      (when (eq (char-before (match-beginning 1)) ?\\)
        ;; Backslash cannot escape a single quote.
        (put-text-property (1- (match-beginning 1)) (match-beginning 1)
                           'syntax-table (string-to-syntax ".")))
      (put-text-property (match-beginning 1) (match-end 1)
                         'syntax-table (string-to-syntax "\"'")))))

(defvar electric-layout-rules)

;; FIXME: cc-mode.el also adds an entry for .m files, mapping them to
;; objc-mode.  We here rely on the fact that loaddefs.el is filled in
;; alphabetical order, so cc-mode.el comes before octave-mode.el, which lets
;; our entry come first!
;;;###autoload (add-to-list 'auto-mode-alist '("\\.m\\'" . octave-maybe-mode))

;;;###autoload
(defun octave-maybe-mode ()
  "Select `octave-mode' if the current buffer seems to hold Octave code."
  (if (save-excursion
        (with-syntax-table octave-mode-syntax-table
          (goto-char (point-min))
          (forward-comment (point-max))
          ;; FIXME: What about Octave files which don't start with "function"?
          (looking-at "function")))
      (octave-mode)
    (let ((x (rassq 'octave-maybe-mode auto-mode-alist)))
      (when x
        (let ((auto-mode-alist (remove x auto-mode-alist)))
          (set-auto-mode))))))

;;;###autoload
(define-derived-mode octave-mode prog-mode "Octave"
  "Major mode for editing Octave code.

Octave is a high-level language, primarily intended for numerical
computations.  It provides a convenient command line interface
for solving linear and nonlinear problems numerically.  Function
definitions can also be stored in files and used in batch mode.

See Info node `(octave-mode) Using Octave Mode' for more details.

Key bindings:
\\{octave-mode-map}"
  :abbrev-table octave-abbrev-table
  :group 'octave

  (smie-setup octave-smie-grammar #'octave-smie-rules
              :forward-token  #'octave-smie-forward-token
              :backward-token #'octave-smie-backward-token)
  (setq-local smie-indent-basic 'octave-block-offset)
  (add-hook 'smie-indent-functions #'octave-indent-comment nil t)

  (setq-local smie-blink-matching-triggers
              (cons ?\; smie-blink-matching-triggers))
  (unless octave-blink-matching-block
    (remove-hook 'post-self-insert-hook #'smie-blink-matching-open 'local))

  (setq-local electric-indent-chars
              (cons ?\; electric-indent-chars))
  ;; IIUC matlab-mode takes the opposite approach: it makes RET insert
  ;; a ";" at those places where it's correct (i.e. outside of parens).
  (setq-local electric-layout-rules '((?\; . after)))

  (setq-local comment-use-syntax t)
  (setq-local comment-start octave-comment-start)
  (setq-local comment-end "")
  (setq-local comment-start-skip octave-comment-start-skip)
  (setq-local comment-add 1)

  (setq-local parse-sexp-ignore-comments t)
  (setq-local paragraph-start (concat "\\s-*$\\|" page-delimiter))
  (setq-local paragraph-separate paragraph-start)
  (setq-local paragraph-ignore-fill-prefix t)
  (setq-local fill-paragraph-function 'octave-fill-paragraph)

  (setq-local fill-nobreak-predicate
              (lambda () (eq (octave-in-string-p) ?')))
  (add-function :around (local 'comment-line-break-function)
                #'octave--indent-new-comment-line)

  (setq font-lock-defaults '(octave-font-lock-keywords))

  (setq-local syntax-propertize-function #'octave-syntax-propertize-function)

  (setq-local imenu-generic-expression octave-mode-imenu-generic-expression)
  (setq-local imenu-case-fold-search nil)

  (setq-local add-log-current-defun-function #'octave-add-log-current-defun)

  (add-hook 'completion-at-point-functions 'octave-completion-at-point nil t)
  (add-hook 'before-save-hook 'octave-sync-function-file-names nil t)
  (setq-local beginning-of-defun-function 'octave-beginning-of-defun)
  (and octave-font-lock-texinfo-comment (octave-font-lock-texinfo-comment))
  (add-function :before-until (local 'eldoc-documentation-function)
                'octave-eldoc-function)

  (easy-menu-add octave-mode-menu))

\f
(defcustom inferior-octave-program "octave"
  "Program invoked by `inferior-octave'."
  :type 'string)

(defcustom inferior-octave-buffer "*Inferior Octave*"
  "Name of buffer for running an inferior Octave process."
  :type 'string)

(defcustom inferior-octave-prompt
  ;; For Octave >= 3.8, default is always 'octave', see
  ;; https://hg.savannah.gnu.org/hgweb/octave/rev/708173343c50
  "\\(?:^octave\\(?:.bin\\|.exe\\)?\\(?:-[.0-9]+\\)?\\(?::[0-9]+\\)?\\|^debug\\|^\\)>+ "
  "Regexp to match prompts for the inferior Octave process."
  :type 'regexp)

(defcustom inferior-octave-prompt-read-only comint-prompt-read-only
  "If non-nil, the Octave prompt is read only.
See `comint-prompt-read-only' for details."
  :type 'boolean
  :version "24.4")

(defcustom inferior-octave-startup-file
  (let ((n (file-name-nondirectory inferior-octave-program)))
    (locate-user-emacs-file (format "init_%s.m" n) (format ".emacs-%s" n)))
  "Name of the inferior Octave startup file.
The contents of this file are sent to the inferior Octave process on
startup."
  :type '(choice (const :tag "None" nil) file)
  :version "24.4")

(defcustom inferior-octave-startup-args '("-i" "--no-line-editing")
  "List of command line arguments for the inferior Octave process.
For example, for suppressing the startup message and using `traditional'
mode, include \"-q\" and \"--traditional\"."
  :type '(repeat string)
  :version "24.4")

(define-obsolete-variable-alias 'inferior-octave-startup-hook
  'inferior-octave-mode-hook "24.4")

(defcustom inferior-octave-mode-hook nil
  "Hook to be run when Inferior Octave mode is started."
  :type 'hook)

(defcustom inferior-octave-error-regexp-alist
  '(("error:\\s-*\\(.*?\\) at line \\([0-9]+\\), column \\([0-9]+\\)"
     1 2 3 2 1)
    ("warning:\\s-*\\([^:\n]+\\):.*at line \\([0-9]+\\), column \\([0-9]+\\)"
     1 2 3 1 1))
  "Value for `compilation-error-regexp-alist' in inferior octave."
  :version "24.4"
  :type '(repeat (choice (symbol :tag "Predefined symbol")
                         (sexp :tag "Error specification"))))

(defvar inferior-octave-compilation-font-lock-keywords
  '(("\\_<PASS\\_>" . compilation-info-face)
    ("\\_<FAIL\\_>" . compilation-error-face)
    ("\\_<\\(warning\\):" 1 compilation-warning-face)
    ("\\_<\\(error\\):" 1 compilation-error-face)
    ("^\\s-*!!!!!.*\\|^.*failed$" . compilation-error-face))
  "Value for `compilation-mode-font-lock-keywords' in inferior octave.")

(defvar inferior-octave-process nil)

(defvar inferior-octave-mode-map
  (let ((map (make-sparse-keymap)))
    (set-keymap-parent map comint-mode-map)
    (define-key map "\M-." 'octave-find-definition)
    (define-key map "\t" 'completion-at-point)
    (define-key map "\C-hd" 'octave-help)
    (define-key map "\C-ha" 'octave-lookfor)
    ;; Same as in `shell-mode'.
    (define-key map "\M-?" 'comint-dynamic-list-filename-completions)
    (define-key map "\C-c\C-l" 'inferior-octave-dynamic-list-input-ring)
    (define-key map [menu-bar inout list-history]
      '("List Input History" . inferior-octave-dynamic-list-input-ring))
    map)
  "Keymap used in Inferior Octave mode.")

(defvar inferior-octave-mode-syntax-table
  (let ((table (make-syntax-table octave-mode-syntax-table)))
    table)
  "Syntax table in use in `inferior-octave-mode' buffers.")

(defvar inferior-octave-font-lock-keywords
  (list
   (cons inferior-octave-prompt 'font-lock-type-face))
  ;; Could certainly do more font locking in inferior Octave ...
  "Additional expressions to highlight in Inferior Octave mode.")

(defvar inferior-octave-output-list nil)
(defvar inferior-octave-output-string nil)
(defvar inferior-octave-receive-in-progress nil)

(defvar inferior-octave-dynamic-complete-functions
  '(inferior-octave-completion-at-point comint-filename-completion)
  "List of functions called to perform completion for inferior Octave.
This variable is used to initialize `comint-dynamic-complete-functions'
in the Inferior Octave buffer.")

(defvar info-lookup-mode)
(defvar compilation-error-regexp-alist)
(defvar compilation-mode-font-lock-keywords)

(declare-function compilation-forget-errors "compile" ())

(defun inferior-octave-process-live-p ()
  (process-live-p inferior-octave-process))

(define-derived-mode inferior-octave-mode comint-mode "Inferior Octave"
  "Major mode for interacting with an inferior Octave process.

See Info node `(octave-mode) Running Octave from Within Emacs' for more
details.

Key bindings:
\\{inferior-octave-mode-map}"
  :abbrev-table octave-abbrev-table
  :group 'octave

  (setq comint-prompt-regexp inferior-octave-prompt)

  (setq-local comment-use-syntax t)
  (setq-local comment-start octave-comment-start)
  (setq-local comment-end "")
  (setq comment-column 32)
  (setq-local comment-start-skip octave-comment-start-skip)

  (setq font-lock-defaults '(inferior-octave-font-lock-keywords nil nil))

  (setq-local info-lookup-mode 'octave-mode)
  (setq-local eldoc-documentation-function 'octave-eldoc-function)

  (setq-local comint-input-ring-file-name
              (or (getenv "OCTAVE_HISTFILE") "~/.octave_hist"))
  (setq-local comint-input-ring-size
              (string-to-number (or (getenv "OCTAVE_HISTSIZE") "1024")))
  (comint-read-input-ring t)
  (setq-local comint-dynamic-complete-functions
              inferior-octave-dynamic-complete-functions)
  (setq-local comint-prompt-read-only inferior-octave-prompt-read-only)
  (add-hook 'comint-input-filter-functions
            'inferior-octave-directory-tracker nil t)
  ;; http://thread.gmane.org/gmane.comp.gnu.octave.general/48572
  (add-hook 'window-configuration-change-hook
            'inferior-octave-track-window-width-change nil t)
  (setq-local compilation-error-regexp-alist inferior-octave-error-regexp-alist)
  (setq-local compilation-mode-font-lock-keywords
              inferior-octave-compilation-font-lock-keywords)
  (compilation-shell-minor-mode 1)
  (compilation-forget-errors))

;;;###autoload
(defun inferior-octave (&optional arg)
  "Run an inferior Octave process, I/O via `inferior-octave-buffer'.
This buffer is put in Inferior Octave mode.  See `inferior-octave-mode'.

Unless ARG is non-nil, switches to this buffer.

The elements of the list `inferior-octave-startup-args' are sent as
command line arguments to the inferior Octave process on startup.

Additional commands to be executed on startup can be provided either in
the file specified by `inferior-octave-startup-file' or by the default
startup file, `~/.emacs-octave'."
  (interactive "P")
  (let ((buffer (get-buffer-create inferior-octave-buffer)))
    (unless arg
      (pop-to-buffer buffer))
    (unless (comint-check-proc buffer)
      (with-current-buffer buffer
        (inferior-octave-startup)
        (inferior-octave-mode)))
    buffer))

;;;###autoload
(defalias 'run-octave 'inferior-octave)

(defun inferior-octave-startup ()
  "Start an inferior Octave process."
  (let ((proc (comint-exec-1
               (substring inferior-octave-buffer 1 -1)
               inferior-octave-buffer
               inferior-octave-program
               (append
                inferior-octave-startup-args
                ;; --no-gui is introduced in Octave > 3.7
                (and (not (member "--no-gui" inferior-octave-startup-args))
                     (zerop (process-file inferior-octave-program
                                          nil nil nil "--no-gui" "--help"))
                     '("--no-gui"))))))
    (set-process-filter proc 'inferior-octave-output-digest)
    (setq inferior-octave-process proc
          inferior-octave-output-list nil
          inferior-octave-output-string nil
          inferior-octave-receive-in-progress t)

    ;; This may look complicated ... However, we need to make sure that
    ;; we additional startup code only AFTER Octave is ready (otherwise,
    ;; output may be mixed up).  Hence, we need to digest the Octave
    ;; output to see when it issues a prompt.
    (while inferior-octave-receive-in-progress
      (unless (inferior-octave-process-live-p)
        ;; Spit out the error messages.
        (when inferior-octave-output-list
          (princ (concat (mapconcat 'identity inferior-octave-output-list "\n")
                         "\n")
                 (process-mark inferior-octave-process)))
        (error "Process `%s' died" inferior-octave-process))
      (accept-process-output inferior-octave-process))
    (goto-char (point-max))
    (set-marker (process-mark proc) (point))
    (insert-before-markers
     (concat
      (if (not (bobp)) "\f\n")
      (if inferior-octave-output-list
          (concat (mapconcat
                   'identity inferior-octave-output-list "\n")
                  "\n"))))

    ;; An empty secondary prompt, as e.g. obtained by '--braindead',
    ;; means trouble.
    (inferior-octave-send-list-and-digest (list "PS2\n"))
    (when (string-match "\\(PS2\\|ans\\) = *$"
                        (car inferior-octave-output-list))
      (inferior-octave-send-list-and-digest (list "PS2 ('> ');\n")))

    (inferior-octave-send-list-and-digest
     (list "disp (getenv ('OCTAVE_SRCDIR'))\n"))
    (process-put proc 'octave-srcdir
                 (unless (equal (car inferior-octave-output-list) "")
                   (car inferior-octave-output-list)))

    ;; O.K., now we are ready for the Inferior Octave startup commands.
    (inferior-octave-send-list-and-digest
     (list "more off;\n"
           (unless (equal inferior-octave-output-string ">> ")
             ;; See https://hg.savannah.gnu.org/hgweb/octave/rev/708173343c50
             "PS1 ('octave> ');\n")
           (when (and inferior-octave-startup-file
                      (file-exists-p inferior-octave-startup-file))
             (format "source ('%s');\n" inferior-octave-startup-file))))
    (when inferior-octave-output-list
      (insert-before-markers
       (mapconcat 'identity inferior-octave-output-list "\n")))

    ;; And finally, everything is back to normal.
    (set-process-filter proc 'comint-output-filter)
    ;; Just in case, to be sure a cd in the startup file won't have
    ;; detrimental effects.
    (with-demoted-errors (inferior-octave-resync-dirs))
    ;; Generate a proper prompt, which is critical to
    ;; `comint-history-isearch-backward-regexp'.  Bug#14433.
    (comint-send-string proc "\n")))

(defun inferior-octave-completion-table ()
  (completion-table-with-cache
   (lambda (command)
     (inferior-octave-send-list-and-digest
      (list (format "completion_matches ('%s');\n" command)))
     (delete-consecutive-dups
      (sort inferior-octave-output-list 'string-lessp)))))

(defun inferior-octave-completion-at-point ()
  "Return the data to complete the Octave symbol at point."
  ;; https://debbugs.gnu.org/14300
  (unless (string-match-p "/" (or (comint--match-partial-filename) ""))
    (let ((beg (save-excursion
                 (skip-syntax-backward "w_" (comint-line-beginning-position))
                 (point)))
          (end (point)))
      (when (and beg (> end beg))
        (list beg end (completion-table-in-turn
                       (inferior-octave-completion-table)
                       'comint-completion-file-name-table))))))

(defun inferior-octave-dynamic-list-input-ring ()
  "List the buffer's input history in a help buffer."
  ;; We cannot use `comint-dynamic-list-input-ring', because it replaces
  ;; "completion" by "history reference" ...
  (interactive)
  (if (or (not (ring-p comint-input-ring))
          (ring-empty-p comint-input-ring))
      (message "No history")
    (let ((history nil)
          (history-buffer " *Input History*")
          (index (1- (ring-length comint-input-ring)))
          (conf (current-window-configuration)))
      ;; We have to build up a list ourselves from the ring vector.
      (while (>= index 0)
        (setq history (cons (ring-ref comint-input-ring index) history)
              index (1- index)))
      ;; Change "completion" to "history reference"
      ;; to make the display accurate.
      (with-output-to-temp-buffer history-buffer
        (display-completion-list history)
        (set-buffer history-buffer))
      (message "Hit space to flush")
      (let ((ch (read-event)))
        (if (eq ch ?\ )
            (set-window-configuration conf)
          (push ch unread-command-events))))))

(defun inferior-octave-output-digest (_proc string)
  "Special output filter for the inferior Octave process.
Save all output between newlines into `inferior-octave-output-list', and
the rest to `inferior-octave-output-string'."
  (setq string (concat inferior-octave-output-string string))
  (while (string-match "\n" string)
    (setq inferior-octave-output-list
	  (append inferior-octave-output-list
		  (list (substring string 0 (match-beginning 0))))
	  string (substring string (match-end 0))))
  (if (string-match inferior-octave-prompt string)
      (setq inferior-octave-receive-in-progress nil))
  (setq inferior-octave-output-string string))

(defun inferior-octave-check-process ()
  (or (inferior-octave-process-live-p)
      (error (substitute-command-keys
              "No inferior octave process running. Type \\[run-octave]"))))

(defun inferior-octave-send-list-and-digest (list)
  "Send LIST to the inferior Octave process and digest the output.
The elements of LIST have to be strings and are sent one by one.  All
output is passed to the filter `inferior-octave-output-digest'."
  (inferior-octave-check-process)
  (let* ((proc inferior-octave-process)
	 (filter (process-filter proc))
	 string)
    (set-process-filter proc 'inferior-octave-output-digest)
    (setq inferior-octave-output-list nil)
    (unwind-protect
	(while (setq string (car list))
	  (setq inferior-octave-output-string nil
		inferior-octave-receive-in-progress t)
	  (comint-send-string proc string)
	  (while inferior-octave-receive-in-progress
	    (accept-process-output proc))
	  (setq list (cdr list)))
      (set-process-filter proc filter))))

(defvar inferior-octave-directory-tracker-resync nil)
(make-variable-buffer-local 'inferior-octave-directory-tracker-resync)

(defun inferior-octave-directory-tracker (string)
  "Tracks `cd' commands issued to the inferior Octave process.
Use \\[inferior-octave-resync-dirs] to resync if Emacs gets confused."
  (when inferior-octave-directory-tracker-resync
    (or (inferior-octave-resync-dirs 'noerror)
        (setq inferior-octave-directory-tracker-resync nil)))
  (cond
   ((string-match "^[ \t]*cd[ \t;]*$" string)
    (cd "~"))
   ((string-match "^[ \t]*cd[ \t]+\\([^ \t\n;]*\\)[ \t\n;]*" string)
    (condition-case err
        (cd (match-string 1 string))
      (error (setq inferior-octave-directory-tracker-resync t)
             (message "%s: `%s'"
                      (error-message-string err)
                      (match-string 1 string)))))))

(defun inferior-octave-resync-dirs (&optional noerror)
  "Resync the buffer's idea of the current directory.
This command queries the inferior Octave process about its current
directory and makes this the current buffer's default directory."
  (interactive)
  (inferior-octave-send-list-and-digest '("disp (pwd ())\n"))
  (condition-case err
      (progn
        (cd (car inferior-octave-output-list))
        t)
    (error (unless noerror (signal (car err) (cdr err))))))

(defcustom inferior-octave-minimal-columns 80
  "The minimal column width for the inferior Octave process."
  :type 'integer
  :version "24.4")

(defvar inferior-octave-last-column-width nil)

(defun inferior-octave-track-window-width-change ()
  ;; http://thread.gmane.org/gmane.comp.gnu.octave.general/48572
  (let ((width (max inferior-octave-minimal-columns (window-width))))
    (unless (eq inferior-octave-last-column-width width)
      (setq-local inferior-octave-last-column-width width)
      (when (inferior-octave-process-live-p)
        (inferior-octave-send-list-and-digest
         (list (format "putenv ('COLUMNS', '%s');\n" width)))))))

\f
;;; Miscellaneous useful functions

(defun octave-in-comment-p ()
  "Return non-nil if point is inside an Octave comment."
  (nth 4 (syntax-ppss)))

(defun octave-in-string-p ()
  "Return non-nil if point is inside an Octave string."
  (nth 3 (syntax-ppss)))

(defun octave-in-string-or-comment-p ()
  "Return non-nil if point is inside an Octave string or comment."
  (nth 8 (syntax-ppss)))

(defun octave-looking-at-kw (regexp)
  "Like `looking-at', but sets `case-fold-search' nil."
  (let ((case-fold-search nil))
    (looking-at regexp)))

(defun octave-maybe-insert-continuation-string ()
  (if (or (octave-in-comment-p)
	  (save-excursion
	    (beginning-of-line)
	    (looking-at octave-continuation-regexp)))
      nil
    (delete-horizontal-space)
    (insert (concat " " octave-continuation-string))))

(defun octave-completing-read ()
  (let ((def (or (thing-at-point 'symbol)
                 (save-excursion
                   (skip-syntax-backward "-(")
                   (thing-at-point 'symbol)))))
    (completing-read
     (format (if def "Function (default %s): " "Function: ") def)
     (inferior-octave-completion-table)
     nil nil nil nil def)))

(defun octave-goto-function-definition (fn)
  "Go to the function definition of FN in current buffer."
  (let ((search
         (lambda (re sub)
           (let ((orig (point)) found)
             (goto-char (point-min))
             (while (and (not found) (re-search-forward re nil t))
               (when (and (equal (match-string sub) fn)
                          (not (nth 8 (syntax-ppss))))
                 (setq found t)))
             (unless found (goto-char orig))
             found))))
    (pcase (and buffer-file-name (file-name-extension buffer-file-name))
      ("cc" (funcall search
                     "\\_<DEFUN\\(?:_DLD\\)?\\s-*(\\s-*\\(\\(?:\\sw\\|\\s_\\)+\\)" 1))
      (_ (funcall search octave-function-header-regexp 3)))))

(defun octave-function-file-p ()
  "Return non-nil if the first token is \"function\".
The value is (START END NAME-START NAME-END) of the function."
  (save-excursion
    (goto-char (point-min))
    (when (equal (funcall smie-forward-token-function) "function")
      (forward-word-strictly -1)
      (let* ((start (point))
             (end (progn (forward-sexp 1) (point)))
             (name (when (progn
                           (goto-char start)
                           (re-search-forward octave-function-header-regexp
                                              end t))
                     (list (match-beginning 3) (match-end 3)))))
        (cons start (cons end name))))))

;; Like forward-comment but stop at non-comment blank
(defun octave-skip-comment-forward (limit)
  (let ((ppss (syntax-ppss)))
    (if (nth 4 ppss)
        (goto-char (nth 8 ppss))
      (goto-char (or (comment-search-forward limit t) (point)))))
  (while (and (< (point) limit) (looking-at-p "\\s<"))
    (forward-comment 1)))

;;; First non-copyright comment block
(defun octave-function-file-comment ()
  "Beginning and end positions of the function file comment."
  (save-excursion
    (goto-char (point-min))
    ;; Copyright block: octave/libinterp/parse-tree/lex.ll around line 1634
    (while (save-excursion
             (when (comment-search-forward (point-max) t)
               (when (eq (char-after) ?\{) ; case of block comment
                 (forward-char 1))
               (skip-syntax-forward "-")
               (let ((case-fold-search t))
                 (looking-at-p "\\(?:copyright\\|author\\)\\_>"))))
      (octave-skip-comment-forward (point-max)))
    (let ((beg (comment-search-forward (point-max) t)))
      (when beg
        (goto-char beg)
        (octave-skip-comment-forward (point-max))
        (list beg (point))))))

(defun octave-sync-function-file-names ()
  "Ensure function name agree with function file name.
See Info node `(octave)Function Files'."
  (interactive)
  (when buffer-file-name
    (pcase-let ((`(,start ,_end ,name-start ,name-end)
                 (octave-function-file-p)))
      (when (and start name-start)
        (let* ((func (buffer-substring name-start name-end))
               (file (file-name-sans-extension
                      (file-name-nondirectory buffer-file-name)))
               (help-form (format-message "\
a: Use function name `%s'
b: Use file name `%s'
q: Don't fix\n" func file))
               (c (unless (equal file func)
                    (save-window-excursion
                      (help-form-show)
                      (read-char-choice
                       "Which name to use? (a/b/q) " '(?a ?b ?q))))))
          (pcase c
            (?a (let ((newname (expand-file-name
                                (concat func (file-name-extension
                                              buffer-file-name t)))))
                  (when (or (not (file-exists-p newname))
                            (yes-or-no-p
                             (format "Target file %s exists; proceed? " newname)))
                    (when (file-exists-p buffer-file-name)
                      (rename-file buffer-file-name newname t))
                    (set-visited-file-name newname))))
            (?b (save-excursion
                  (goto-char name-start)
                  (delete-region name-start name-end)
                  (insert file)))))))))

(defun octave-update-function-file-comment (beg end)
  "Query replace function names in function file comment."
  (interactive
   (progn
     (barf-if-buffer-read-only)
     (if (use-region-p)
         (list (region-beginning) (region-end))
       (or (octave-function-file-comment)
           (error "No function file comment found")))))
  (save-excursion
    (let* ((bounds (or (octave-function-file-p)
                       (error "Not in a function file buffer")))
           (func (if (cddr bounds)
                     (apply #'buffer-substring (cddr bounds))
                   (error "Function name not found")))
           (old-func (progn
                       (goto-char beg)
                       (when (re-search-forward
                              "[=}]\\s-*\\(\\(?:\\sw\\|\\s_\\)+\\)\\_>"
                              (min (line-end-position 4) end)
                              t)
                         (match-string 1))))
           (old-func (read-string (format (if old-func
                                              "Name to replace (default %s): "
                                            "Name to replace: ")
                                          old-func)
                                  nil nil old-func)))
      (if (and func old-func (not (equal func old-func)))
          (perform-replace old-func func 'query
                           nil 'delimited nil nil beg end)
        (message "Function names match")))))

(defface octave-function-comment-block
  '((t (:inherit font-lock-doc-face)))
  "Face used to highlight function comment block.")

(eval-when-compile (require 'texinfo))
;; Undo the effects of texinfo loading tex-mode loading compile.
(declare-function compilation-forget-errors "compile" ())

(defun octave-font-lock-texinfo-comment ()
  (let ((kws
         (eval-when-compile
           (delq nil (mapcar
                      (lambda (kw)
                        (if (numberp (nth 1 kw))
                            `(,(nth 0 kw) ,(nth 1 kw) ,(nth 2 kw) prepend)
                          (message "Ignoring Texinfo highlight: %S" kw)))
                      texinfo-font-lock-keywords)))))
    (font-lock-add-keywords
     nil
     `((,(lambda (limit)
           (while (and (< (point) limit)
                       (search-forward "-*- texinfo -*-" limit t)
                       (octave-in-comment-p))
             (let ((beg (nth 8 (syntax-ppss)))
                   (end (progn
                          (octave-skip-comment-forward (point-max))
                          (point))))
               (put-text-property beg end 'font-lock-multiline t)
               (font-lock-prepend-text-property
                beg end 'face 'octave-function-comment-block)
               (dolist (kw kws)
                 (goto-char beg)
                 (while (re-search-forward (car kw) end 'move)
                   (font-lock-apply-highlight (cdr kw))))))
           nil)))
     'append)))

\f
;;; Indentation

(defun octave-indent-new-comment-line (&optional soft)
  "Break Octave line at point, continuing comment if within one.
Insert `octave-continuation-string' before breaking the line
unless inside a list.  Signal an error if within a single-quoted
string."
  (interactive)
  (funcall comment-line-break-function soft))

(defun octave--indent-new-comment-line (orig &rest args)
  (cond
   ((octave-in-comment-p) nil)
   ((eq (octave-in-string-p) ?')
    (error "Cannot split a single-quoted string"))
   ((eq (octave-in-string-p) ?\")
    (insert octave-continuation-string))
   (t
    (delete-horizontal-space)
    (unless (and (cadr (syntax-ppss))
                 (eq (char-after (cadr (syntax-ppss))) ?\())
      (insert " " octave-continuation-string))))
  (apply orig args)
  (indent-according-to-mode))

(define-obsolete-function-alias
  'octave-indent-defun 'prog-indent-sexp "24.4")

\f
;;; Motion
(defun octave-next-code-line (&optional arg)
  "Move ARG lines of Octave code forward (backward if ARG is negative).
Skips past all empty and comment lines.  Default for ARG is 1.

On success, return 0.  Otherwise, go as far as possible and return -1."
  (interactive "p")
  (or arg (setq arg 1))
  (beginning-of-line)
  (let ((n 0)
	(inc (if (> arg 0) 1 -1)))
    (while (and (/= arg 0) (= n 0))
      (setq n (forward-line inc))
      (while (and (= n 0)
		  (looking-at "\\s-*\\($\\|\\s<\\)"))
	(setq n (forward-line inc)))
      (setq arg (- arg inc)))
    n))

(defun octave-previous-code-line (&optional arg)
  "Move ARG lines of Octave code backward (forward if ARG is negative).
Skips past all empty and comment lines.  Default for ARG is 1.

On success, return 0.  Otherwise, go as far as possible and return -1."
  (interactive "p")
  (or arg (setq arg 1))
  (octave-next-code-line (- arg)))

(defun octave-beginning-of-line ()
  "Move point to beginning of current Octave line.
If on an empty or comment line, go to the beginning of that line.
Otherwise, move backward to the beginning of the first Octave code line
which is not inside a continuation statement, i.e., which does not
follow a code line ending with `...' or is inside an open
parenthesis list."
  (interactive)
  (beginning-of-line)
  (unless (looking-at "\\s-*\\($\\|\\s<\\)")
    (while (or (when (cadr (syntax-ppss))
                 (goto-char (cadr (syntax-ppss)))
                 (beginning-of-line)
                 t)
               (and (or (looking-at "\\s-*\\($\\|\\s<\\)")
                        (save-excursion
                          (if (zerop (octave-previous-code-line))
                              (looking-at octave-continuation-regexp))))
                    (zerop (forward-line -1)))))))

(defun octave-end-of-line ()
  "Move point to end of current Octave line.
If on an empty or comment line, go to the end of that line.
Otherwise, move forward to the end of the first Octave code line which
does not end with `...' or is inside an open parenthesis list."
  (interactive)
  (end-of-line)
  (unless (save-excursion
            (beginning-of-line)
            (looking-at "\\s-*\\($\\|\\s<\\)"))
    (while (or (when (cadr (syntax-ppss))
                 (condition-case nil
                     (progn
                       (up-list 1)
                       (end-of-line)
                       t)
                   (error nil)))
               (and (save-excursion
                      (beginning-of-line)
                      (or (looking-at "\\s-*\\($\\|\\s<\\)")
                          (looking-at octave-continuation-regexp)))
                    (zerop (forward-line 1)))))
    (end-of-line)))

(defun octave-mark-block ()
  "Put point at the beginning of this Octave block, mark at the end.
The block marked is the one that contains point or follows point."
  (interactive)
  (if (and (looking-at "\\sw\\|\\s_")
           (looking-back "\\sw\\|\\s_" (1- (point))))
      (skip-syntax-forward "w_"))
  (unless (or (looking-at "\\s(")
              (save-excursion
                (let* ((token (funcall smie-forward-token-function))
                       (level (assoc token smie-grammar)))
                  (and level (not (numberp (cadr level)))))))
    (backward-up-list 1))
  (mark-sexp))

(defun octave-beginning-of-defun (&optional arg)
  "Octave-specific `beginning-of-defun-function' (which see)."
  (or arg (setq arg 1))
  ;; Move out of strings or comments.
  (when (octave-in-string-or-comment-p)
    (goto-char (octave-in-string-or-comment-p)))
  (letrec ((orig (point))
           (toplevel (lambda (pos)
                       (condition-case nil
                           (progn
                             (backward-up-list 1)
                             (funcall toplevel (point)))
                         (scan-error pos)))))
    (goto-char (funcall toplevel (point)))
    (when (and (> arg 0) (/= orig (point)))
      (setq arg (1- arg)))
    (forward-sexp (- arg))
    (and (< arg 0) (forward-sexp -1))
    (/= orig (point))))

(defun octave-fill-paragraph (&optional _arg)
  "Fill paragraph of Octave code, handling Octave comments."
  ;; FIXME: difference with generic fill-paragraph:
  ;; - code lines are only split, never joined.
  ;; - \n that end comments are never removed.
  ;; - insert continuation marker when splitting code lines.
  (interactive "P")
  (save-excursion
    (let ((end (progn (forward-paragraph) (copy-marker (point) t)))
          (beg (progn
                 (forward-paragraph -1)
                 (skip-chars-forward " \t\n")
                 (beginning-of-line)
                 (point)))
          (cfc (current-fill-column))
          comment-prefix)
      (goto-char beg)
      (while (< (point) end)
        (condition-case nil
            (indent-according-to-mode)
          (error nil))
        (move-to-column cfc)
        ;; First check whether we need to combine non-empty comment lines
        (if (and (< (current-column) cfc)
                 (octave-in-comment-p)
                 (not (save-excursion
                        (beginning-of-line)
                        (looking-at "^\\s-*\\s<+\\s-*$"))))
            ;; This is a nonempty comment line which does not extend
            ;; past the fill column.  If it is followed by a nonempty
            ;; comment line with the same comment prefix, try to
            ;; combine them, and repeat this until either we reach the
            ;; fill-column or there is nothing more to combine.
            (progn
              ;; Get the comment prefix
              (save-excursion
                (beginning-of-line)
                (while (and (re-search-forward "\\s<+")
                            (not (octave-in-comment-p))))
                (setq comment-prefix (match-string 0)))
              ;; And keep combining ...
              (while (and (< (current-column) cfc)
                          (save-excursion
                            (forward-line 1)
                            (and (looking-at
                                  (concat "^\\s-*"
                                          comment-prefix
                                          "\\S<"))
                                 (not (looking-at
                                       (concat "^\\s-*"
                                               comment-prefix
                                               "\\s-*$"))))))
                (delete-char 1)
                (re-search-forward comment-prefix)
                (delete-region (match-beginning 0) (match-end 0))
                (fixup-whitespace)
                (move-to-column cfc))))
        ;; We might also try to combine continued code lines>  Perhaps
        ;; some other time ...
        (skip-chars-forward "^ \t\n")
        (delete-horizontal-space)
        (if (or (< (current-column) cfc)
                (and (= (current-column) cfc) (eolp)))
            (forward-line 1)
          (if (not (eolp)) (insert " "))
          (or (funcall normal-auto-fill-function)
              (forward-line 1))))
      t)))

(defun octave-completion-at-point ()
  "Find the text to complete and the corresponding table."
  (let* ((beg (save-excursion (skip-syntax-backward "w_") (point)))
         (end (point)))
    (if (< beg (point))
        ;; Extend region past point, if applicable.
        (save-excursion (skip-syntax-forward "w_")
                        (setq end (point))))
    (when (> end beg)
      (list beg end (or (and (inferior-octave-process-live-p)
                             (inferior-octave-completion-table))
                        octave-reserved-words)))))

(defun octave-add-log-current-defun ()
  "A function for `add-log-current-defun-function' (which see)."
  (save-excursion
    (end-of-line)
    (and (beginning-of-defun)
         (re-search-forward octave-function-header-regexp
                            (line-end-position) t)
         (match-string 3))))

\f
;;; Electric characters && friends
(define-skeleton octave-insert-defun
  "Insert an Octave function skeleton.
Prompt for the function's name, arguments and return values (to be
entered without parens)."
  (let* ((defname (file-name-sans-extension (buffer-name)))
         (name (read-string (format "Function name (default %s): " defname)
                            nil nil defname))
         (args (read-string "Arguments: "))
         (vals (read-string "Return values: ")))
    (format "%s%s (%s)"
            (cond
             ((string-equal vals "") vals)
             ((string-match "[ ,]" vals) (concat "[" vals "] = "))
             (t (concat vals " = ")))
            name
            args))
  \n octave-block-comment-start "usage: " str \n
  octave-block-comment-start '(delete-horizontal-space) \n
  octave-block-comment-start '(delete-horizontal-space) \n
  "function " > str \n
  _ \n
  "endfunction" > \n)

;;; Communication with the inferior Octave process
(defun octave-kill-process ()
  "Kill inferior Octave process and its buffer."
  (interactive)
  (when (and (buffer-live-p (get-buffer inferior-octave-buffer))
             (or (yes-or-no-p (format "Kill %S and its buffer? "
                                      inferior-octave-process))
                 (user-error "Aborted")))
    (when (inferior-octave-process-live-p)
      (set-process-query-on-exit-flag inferior-octave-process nil)
      (process-send-string inferior-octave-process "quit;\n")
      (accept-process-output inferior-octave-process))
    (kill-buffer inferior-octave-buffer)))

(defun octave-show-process-buffer ()
  "Make sure that `inferior-octave-buffer' is displayed."
  (interactive)
  (if (get-buffer inferior-octave-buffer)
      (display-buffer inferior-octave-buffer)
    (message "No buffer named %s" inferior-octave-buffer)))

(defun octave-hide-process-buffer ()
  "Delete all windows that display `inferior-octave-buffer'."
  (interactive)
  (if (get-buffer inferior-octave-buffer)
      (delete-windows-on inferior-octave-buffer)
    (message "No buffer named %s" inferior-octave-buffer)))

(defun octave-source-file (file)
  "Execute FILE in the inferior Octave process.
This is done using Octave's source function.  FILE defaults to
current buffer file unless called with a prefix arg \\[universal-argument]."
  (interactive (list (or (and (not current-prefix-arg) buffer-file-name)
                         (read-file-name "File: " nil nil t))))
  (or (stringp file)
      (signal 'wrong-type-argument (list 'stringp file)))
  (inferior-octave t)
  (with-current-buffer inferior-octave-buffer
    (comint-send-string inferior-octave-process
                        (format "source '%s'\n" file))))

(defun octave-send-region (beg end)
  "Send current region to the inferior Octave process."
  (interactive "r")
  (inferior-octave t)
  (let ((proc inferior-octave-process)
        (string (buffer-substring-no-properties beg end))
        line)
    (with-current-buffer inferior-octave-buffer
      ;; https://lists.gnu.org/r/emacs-devel/2013-10/msg00095.html
      (compilation-forget-errors)
      (setq inferior-octave-output-list nil)
      (while (not (string-equal string ""))
        (if (string-match "\n" string)
            (setq line (substring string 0 (match-beginning 0))
                  string (substring string (match-end 0)))
          (setq line string string ""))
        (setq inferior-octave-receive-in-progress t)
        (inferior-octave-send-list-and-digest (list (concat line "\n")))
        (while inferior-octave-receive-in-progress
          (accept-process-output proc))
        (insert-before-markers
         (mapconcat 'identity
                    (append
                     (if octave-send-echo-input (list line) (list ""))
                     inferior-octave-output-list
                     (list inferior-octave-output-string))
                    "\n")))))
  (if octave-send-show-buffer
      (display-buffer inferior-octave-buffer)))

(defun octave-send-buffer ()
  "Send current buffer to the inferior Octave process."
  (interactive)
  (octave-send-region (point-min) (point-max)))

(defun octave-send-block ()
  "Send current Octave block to the inferior Octave process."
  (interactive)
  (save-excursion
    (octave-mark-block)
    (octave-send-region (point) (mark))))

(defun octave-send-defun ()
  "Send current Octave function to the inferior Octave process."
  (interactive)
  (save-excursion
    (mark-defun)
    (octave-send-region (point) (mark))))

(defun octave-send-line (&optional arg)
  "Send current Octave code line to the inferior Octave process.
With positive prefix ARG, send that many lines.
If `octave-send-line-auto-forward' is non-nil, go to the next unsent
code line."
  (interactive "P")
  (or arg (setq arg 1))
  (if (> arg 0)
      (let (beg end)
	(beginning-of-line)
	(setq beg (point))
	(octave-next-code-line (- arg 1))
	(end-of-line)
	(setq end (point))
	(if octave-send-line-auto-forward
	    (octave-next-code-line 1))
	(octave-send-region beg end))))

(defun octave-eval-print-last-sexp ()
  "Evaluate Octave sexp before point and print value into current buffer."
  (interactive)
  (inferior-octave t)
  (let ((standard-output (current-buffer))
	(print-escape-newlines nil)
	(opoint (point)))
    (terpri)
    (prin1
     (save-excursion
       (forward-sexp -1)
       (inferior-octave-send-list-and-digest
	(list (concat (buffer-substring-no-properties (point) opoint)
		      "\n")))
       (mapconcat 'identity inferior-octave-output-list "\n")))
    (terpri)))

\f

(defcustom octave-eldoc-message-style 'auto
  "Octave eldoc message style: auto, oneline, multiline."
  :type '(choice (const :tag "Automatic" auto)
                 (const :tag "One Line" oneline)
                 (const :tag "Multi Line" multiline))
  :version "24.4")

;; (FN SIGNATURE1 SIGNATURE2 ...)
(defvar octave-eldoc-cache nil)

(defun octave-eldoc-function-signatures (fn)
  (unless (equal fn (car octave-eldoc-cache))
    (inferior-octave-send-list-and-digest
     (list (format "print_usage ('%s');\n" fn)))
    (let (result)
      (dolist (line inferior-octave-output-list)
        (when (string-match
               "\\s-*\\(?:--[^:]+\\|usage\\):\\s-*\\(.*\\)$"
               line)
          (push (match-string 1 line) result)))
      (setq octave-eldoc-cache
            (cons (substring-no-properties fn)
                  (nreverse result)))))
  (cdr octave-eldoc-cache))

(defun octave-eldoc-function ()
  "A function for `eldoc-documentation-function' (which see)."
  (when (inferior-octave-process-live-p)
    (let* ((ppss (syntax-ppss))
           (paren-pos (cadr ppss))
           (fn (save-excursion
                 (if (and paren-pos
                          ;; PAREN-POS must be after the prompt
                          (>= paren-pos
                              (if (eq (get-buffer-process (current-buffer))
                                      inferior-octave-process)
                                  (process-mark inferior-octave-process)
                                (point-min)))
                          (or (not (eq (get-buffer-process (current-buffer))
                                       inferior-octave-process))
                              (< (process-mark inferior-octave-process)
                                 paren-pos))
                          (eq (char-after paren-pos) ?\())
                     (goto-char paren-pos)
                   (setq paren-pos nil))
                 (when (or (< (skip-syntax-backward "-") 0) paren-pos)
                   (thing-at-point 'symbol))))
           (sigs (and fn (octave-eldoc-function-signatures fn)))
           (oneline (mapconcat 'identity sigs
                               (propertize " | " 'face 'warning)))
           (multiline (mapconcat (lambda (s) (concat "-- " s)) sigs "\n")))
      ;;
      ;; Return the value according to style.
      (pcase octave-eldoc-message-style
        ('auto (if (< (length oneline) (window-width (minibuffer-window)))
                   oneline
                 multiline))
        ('oneline oneline)
        ('multiline multiline)))))

(defcustom octave-help-buffer "*Octave Help*"
  "Buffer name for `octave-help'."
  :type 'string
  :version "24.4")

;; Used in a mode derived from help-mode.
(declare-function help-button-action "help-mode" (button))

(define-button-type 'octave-help-file
  'follow-link t
  'action #'help-button-action
  'help-function 'octave-find-definition)

(define-button-type 'octave-help-function
  'follow-link t
  'action (lambda (b)
            (octave-help
             (buffer-substring (button-start b) (button-end b)))))

(defvar octave-help-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map "\M-."  'octave-find-definition)
    (define-key map "\C-hd" 'octave-help)
    (define-key map "\C-ha" 'octave-lookfor)
    map))

(define-derived-mode octave-help-mode help-mode "OctHelp"
  "Major mode for displaying Octave documentation."
  :abbrev-table nil
  :syntax-table octave-mode-syntax-table
  (eval-and-compile (require 'help-mode))
  ;; Don't highlight `EXAMPLE' as elisp symbols by using a regexp that
  ;; can never match.
  (setq-local help-xref-symbol-regexp regexp-unmatchable))

(defun octave-help (fn)
  "Display the documentation of FN."
  (interactive (list (octave-completing-read)))
  (inferior-octave-send-list-and-digest
   (list (format "help ('%s');\n" fn)))
  (let ((lines inferior-octave-output-list)
        (inhibit-read-only t))
    (when (string-match "error: \\(.*\\)$" (car lines))
      (error "%s" (match-string 1 (car lines))))
    (with-help-window octave-help-buffer
      (princ (mapconcat 'identity lines "\n"))
      (with-current-buffer octave-help-buffer
        ;; Bound to t so that `help-buffer' returns current buffer for
        ;; `help-setup-xref'.
        (let ((help-xref-following t))
          (help-setup-xref (list 'octave-help fn)
                           (called-interactively-p 'interactive)))
        ;; Note: can be turned off by suppress_verbose_help_message.
        ;;
        ;; Remove boring trailing text: Additional help for built-in functions
        ;; and operators ...
        (goto-char (point-max))
        (when (search-backward "\n\n\n" nil t)
          (goto-char (match-beginning 0))
          (delete-region (point) (point-max)))
        ;; File name highlight
        (goto-char (point-min))
        (when (re-search-forward "from the file \\(.*\\)$"
                                 (line-end-position)
                                 t)
          (let* ((file (match-string 1))
                 (dir (file-name-directory
                       (directory-file-name (file-name-directory file)))))
            (replace-match "" nil nil nil 1)
            (insert (substitute-command-keys "`"))
            ;; Include the parent directory which may be regarded as
            ;; the category for the FN.
            (help-insert-xref-button (file-relative-name file dir)
                                     'octave-help-file fn)
            (insert (substitute-command-keys "'"))))
        ;; Make 'See also' clickable.
        (with-syntax-table octave-mode-syntax-table
          (when (re-search-forward "^\\s-*See also:" nil t)
            (let ((end (save-excursion (re-search-forward "^\\s-*$" nil t))))
              (while (re-search-forward
                      "\\s-*\\([^,\n]+?\\)\\s-*\\(?:[,]\\|[.]?$\\)" end t)
                (make-text-button (match-beginning 1) (match-end 1)
                                  :type 'octave-help-function)))))
        (octave-help-mode)))))

(defun octave-lookfor (str &optional all)
  "Search for the string STR in all function help strings.
If ALL is non-nil search the entire help string else only search the first
sentence."
  (interactive "sSearch for: \nP")
  (inferior-octave-send-list-and-digest
   (list (format "lookfor (%s'%s');\n"
                 (if all "'-all', " "")
                 str)))
  (let ((lines inferior-octave-output-list))
    (when (and (stringp (car lines))
               (string-match "error: \\(.*\\)$" (car lines)))
      (error "%s" (match-string 1 (car lines))))
    (with-help-window octave-help-buffer
      (with-current-buffer octave-help-buffer
        (if lines
            (insert (mapconcat 'identity lines "\n"))
          (insert (format "Nothing found for \"%s\".\n" str)))
        ;; Bound to t so that `help-buffer' returns current buffer for
        ;; `help-setup-xref'.
        (let ((help-xref-following t))
          (help-setup-xref (list 'octave-lookfor str all)
                           (called-interactively-p 'interactive)))
        (goto-char (point-min))
        (when lines
          (while (re-search-forward "^\\([^[:blank:]]+\\) " nil 'noerror)
            (make-text-button (match-beginning 1) (match-end 1)
                              :type 'octave-help-function)))
        (unless all
          (goto-char (point-max))
          (insert "\nRetry with ")
          (insert-text-button "'-all'"
                              'follow-link t
                              'action #'(lambda (_b)
                                          (octave-lookfor str '-all)))
          (insert ".\n"))
        (octave-help-mode)))))

(defcustom octave-source-directories nil
  "A list of directories for Octave sources.
If the environment variable OCTAVE_SRCDIR is set, it is searched first."
  :type '(repeat directory)
  :version "24.4")

(defun octave-source-directories ()
  (let ((srcdir (or (and inferior-octave-process
                         (process-get inferior-octave-process 'octave-srcdir))
                    (getenv "OCTAVE_SRCDIR"))))
    (if srcdir
        (cons srcdir octave-source-directories)
      octave-source-directories)))

(defvar octave-find-definition-filename-function
  #'octave-find-definition-default-filename)

(defun octave-find-definition-default-filename (name)
  "Default value for `octave-find-definition-filename-function'."
  (pcase (file-name-extension name)
    ("oct"
     (octave-find-definition-default-filename
      (concat "libinterp/dldfcn/"
              (file-name-sans-extension (file-name-nondirectory name))
              ".cc")))
    ("cc"
     (let ((file (or (locate-file name (octave-source-directories))
                     (locate-file (file-name-nondirectory name)
                                  (octave-source-directories)))))
       (or (and file (file-exists-p file))
           (error "File `%s' not found" name))
       file))
    ("mex"
     (if (yes-or-no-p (format-message "File `%s' may be binary; open? "
				      (file-name-nondirectory name)))
         name
       (user-error "Aborted")))
    (_ name)))

(defvar find-tag-marker-ring)

(defun octave-find-definition (fn)
  "Find the definition of FN.
Functions implemented in C++ can be found if
variable `octave-source-directories' is set correctly."
  (interactive (list (octave-completing-read)))
  (require 'etags)
  (let ((orig (point)))
    (if (and (derived-mode-p 'octave-mode)
             (octave-goto-function-definition fn))
        (ring-insert find-tag-marker-ring (copy-marker orig))
      (inferior-octave-send-list-and-digest
       ;; help NAME is more verbose
       (list (format "\
if iskeyword('%s') disp('`%s'' is a keyword') else which('%s') endif\n"
                     fn fn fn)))
      (let (line file)
        ;; Skip garbage lines such as
        ;;     warning: fmincg.m: possible Matlab-style ....
        (while (and (not file) (consp inferior-octave-output-list))
          (setq line (pop inferior-octave-output-list))
          (when (string-match "from the file \\(.*\\)$" line)
            (setq file (match-string 1 line))))
        (if (not file)
            (user-error "%s" (or line (format-message "`%s' not found" fn)))
          (ring-insert find-tag-marker-ring (point-marker))
          (setq file (funcall octave-find-definition-filename-function file))
          (when file
            (find-file file)
            (octave-goto-function-definition fn)))))))

(provide 'octave)
;;; octave.el ends here

debug log:

solving 8a7e24e5ad ...
found 8a7e24e5ad in https://git.savannah.gnu.org/cgit/emacs.git

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

Code repositories for project(s) associated with this 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.