aboutsummaryrefslogtreecommitdiffstats
path: root/vim-mode/vim_mode.pl
blob: 2a6edaaf29bdb4dc3817834abd88745c8ba80f70 (plain) (blame)
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
# A script to emulate some of the vi(m) features for the Irssi inputline.
#
# NOTE: This script is still under heavy development, and there may be bugs.
# Please submit reproducible sequences to the bug-tracker at:
# http://github.com/shabble/irssi-scripts/issues
#
# or contact rudi_s or shabble on irc.freenode.net (#irssi)
#
#
# Features:
#
# It supports most commonly used command mode features:
#
# * Insert/Command mode. Escape and Ctrl-C enter command mode.
#   /set vim_mode_cmd_seq j allows to use jj as Escape (any other character
#   can be used as well).
# * Cursor motion: h l 0 ^ $ <space> f t F T
# * History motion: j k G
#   G without a count moves to the current input line, with a count it goes to
#   the count-th history line (1 is the oldest).
# * Cursor word motion: w b ge e W gE B E
# * Word objects (only the following work yet): aw aW
# * Yank and paste: y p P
# * Change and delete: c d
# * Delete at cursor: x X
# * Replace at cursor: r
# * Insert mode: i a I A
# * Switch case: ~
# * Repeat change: .
# * Repeat ftFT: ; ,
# * Registers: "a-"z "" "* "+ "_ (black hole)
#   Appending to register with "A-"Z
#   "" is the default yank/delete register.
#   The special registers "* "+ contain both irssi's cut-buffer.
# * Line-wise shortcuts: dd cc yy
# * Shortcuts: s S C D
# * Scroll the scrollback buffer: Ctrl-D Ctrl-U Ctrl-F Ctrl-B
# * Switch to last active window: Ctrl-6/Ctrl-^
# * Switch split windows: Ctrl-W j Ctrl-W k
# * Undo/Redo: u Ctrl-R
#
# Counts and combinations work as well, e.g. d5fx or 3iabc<esc>
# Repeat also supports counts.
#
# The following insert mode mappings are supported:
#
# * Insert register content: Ctrl-R x (where x is the register to insert)
#
# Ex-mode supports (activated by : in command mode) the following commands:
#
# * Switching buffers: :b <num> - switch to channel number
#                      :b#      - switch to last channel
#                      :b <partial-channel-name>
#                      :b <partial-server>/<partial-channel>
#                      :buffer {args} (same as :b)
#                      :bn - switch to next window
#                      :bp - switch to previous window
# * Close window:      :bd
# * Display windows:   :ls :buffers
# * Display registers: :reg[isters] :di[splay] {args}
# * Display undolist:  :undol[ist] (mostly used for debugging)
#
# The following irssi settings are available:
#
# * vim_mode_utf8: support UTF-8 characters, default on
# * vim_mode_debug: enable debug output, default off
# * vim_mode_cmd_seq: char that when double-pressed simulates <esc>
#
# The following statusbar items are available:
#
# * vim_mode: displays current mode
# * vim_windows: displays windows selected with :b
#
#
# Installation:
#
# As always copy the script into .irssi/scripts and load it with
#     /script load # vim_mode.pl
#
# Use the following command to get a statusbar item that shows which mode
# you're in.
#
#     /statusbar window add vim_mode
#
# And the following to let :b name display a list of matching channels
#
#     /statusbar window add vim_windows
#
#
# Dependencies:
#
# For proper :ex mode support, requires the installation of prompt_info.pl
#  http://github.com/shabble/irssi-scripts/raw/master/prompt_info/prompt_info.pl
#
# and follow the instructions in the top of that file for installation
# instructions.
#
# If you don't need Ex-mode, you can run vim_mode.pl without the
# prompt_info.pl script.
#
#
# Known bugs:
#
# * count before register doesn't work: e.g. 3"ap doesn't work, but "a3p does
#
#
# TODO:
# * History:
#   * /,?,n,N to search through history (like history_search.pl)
# * Window switching (:b)
#  * Tab completion of window(-item) names
#  * non-sequential matches(?)
#
# WONTFIX - things we're not ever likely to do
# * Macros
#
# LICENCE:
#
# Copyright (c) 2010 Tom Feist & Simon Ruderich
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
#
# Have fun!

use strict;
use warnings;

use Encode;
use List::Util;

use Irssi;
use Irssi::TextUI;              # for sbar_items_redraw
use Irssi::Irc;                 # necessary for 0.8.14


use vars qw($VERSION %IRSSI);
$VERSION = "1.0.1";
%IRSSI =
  (
   authors         => "Tom Feist (shabble), Simon Ruderich (rudi_s)",
   contact         => 'shabble+irssi@metavore.org, '
                    . 'shabble@#irssi/Freenode, simon@ruderich.org'
                    . 'rudi_s@#irssi/Freenode',
   name            => "vim_mode",
   description     => "Give Irssi Vim-like commands for editing the inputline",
   license         => "MIT",
   changed         => "28/9/2010"
  );


# CONSTANTS

sub M_CMD() { 1 } # command mode
sub M_INS() { 0 } # insert mode
sub M_EX () { 2 } # extended mode (after a :?)

# word and non-word regex, keep in sync with setup_changed()!
my $word     = qr/[\w_]/o;
my $non_word = qr/[^\w_\s]/o;

# GLOBAL VARIABLES

my $DEBUG_ENABLED = 0;

sub DEBUG { $DEBUG_ENABLED }

# use UTF-8 internally for string calculations/manipulations
my $utf8 = 1;

# buffer to keep track of the last N keystrokes, used for Esc detection and
# insert mode mappings
my @input_buf;
my $input_buf_timer;
my $input_buf_enabled = 0;

# insert mode repeat buffer, used to repeat (.) last insert
my @insert_buf;

# flag to allow us to emulate keystrokes without re-intercepting them
my $should_ignore = 0;

# ex mode buffer
my @ex_buf;

# for commands like 10x
my $numeric_prefix = undef;
# vi operators like d, c, ..
my $operator = undef;
# vi movements, only used when a movement needs more than one key (like f t).
my $movement = undef;
# last vi command, used by .
my $last
  = {
     'char' => 'i', # = i to support . when loading the script
     'numeric_prefix' => undef,
     'operator' => undef,
     'movement' => undef,
     'register' => '"',
    };
# last ftFT movement, used by ; and ,
my $last_ftFT
  = {
     type => undef, # f, t, F or T
     char => undef,
    };

# what Vi mode we're in. We start in insert mode.
my $mode = M_INS;

# current active register
my $register = '"';

# vi registers
my $registers
  = {
     '"' => '', # default register
     '+' => '', # contains irssi's cut buffer
     '*' => '', # same
     '_' => '', # black hole register, always empty
    };
foreach my $char ('a' .. 'z') {
    $registers->{$char} = '';
}

# current imap still pending (first character entered)
my $imap = undef;

# maps for insert mode
my $imaps
  = {
     # ctrl-r, insert register
     "\x12" => { map  => undef, func => \&cmd_insert_ctrl_r },
    };

# index into the history list (for j,k)
my $history_index = undef;
# current line, necessary for j,k or the current input line gets destroyed
my $history_input = undef;
# position in input line
my $history_pos = 0;

# Undo/redo buffer.
my @undo_buffer;
my $undo_index = undef;

sub script_is_loaded {
    my $name = shift;
    print "Checking if $name is loaded" if DEBUG;
    no strict 'refs';
    my $retval = defined %{ "Irssi::Script::${name}::" };
    use strict 'refs';

    return $retval;
}

vim_mode_init();


# vi-operators like d, c, y
my $operators
  = {
     'c' => { func => \&cmd_operator_c },
     'd' => { func => \&cmd_operator_d },
     'y' => { func => \&cmd_operator_y },
    };

# vi-moves like w,b; they move the cursor and may get combined with an
# operator; also things like i/I are listed here, not entirely correct but
# they work in a similar way
#
# Each function returns two values, an updated $cur_pos (see
# handle_command_cmd()) and the new cursor position. If undef is returned in
# either place, the position isn't changed.
my $movements
  = {
     # arrow like movement
     'h' => { func => \&cmd_movement_h },
     'l' => { func => \&cmd_movement_l },
     ' ' => { func => \&cmd_movement_space },
     # history movement
     'j' => { func => \&cmd_movement_j },
     'k' => { func => \&cmd_movement_k },
     'G' => { func => \&cmd_movement_G },
     # char movement, take an additional parameter and use $movement
     'f' => { func => \&cmd_movement_f },
     't' => { func => \&cmd_movement_t },
     'F' => { func => \&cmd_movement_F },
     'T' => { func => \&cmd_movement_T },
     ';' => { func => \&cmd_movement_semicolon },
     ',' => { func => \&cmd_movement_comma },
     # word movement
     'w' => { func => \&cmd_movement_w },
     'b' => { func => \&cmd_movement_b },
     'e' => { func => \&cmd_movement_e },
     'W' => { func => \&cmd_movement_W },
     'B' => { func => \&cmd_movement_B },
     'E' => { func => \&cmd_movement_E },
     # text-objects
     'i_' => { func => \&cmd_movement_i_ },
     'a_' => { func => \&cmd_movement_a_ },
     # line movement
     '0' => { func => \&cmd_movement_0 },
     '^' => { func => \&cmd_movement_caret },
     '$' => { func => \&cmd_movement_dollar },
     # delete chars
     'x' => { func => \&cmd_movement_x },
     'X' => { func => \&cmd_movement_X },
     # insert mode
     'i' => { func => \&cmd_movement_i },
     'I' => { func => \&cmd_movement_I },
     'a' => { func => \&cmd_movement_a },
     'A' => { func => \&cmd_movement_A },
     # replace mode
     'r' => { func => \&cmd_movement_r },
     # paste
     'p' => { func => \&cmd_movement_p },
     'P' => { func => \&cmd_movement_P },
     # to end of line
     'C' => { func => \&cmd_movement_dollar },
     'D' => { func => \&cmd_movement_dollar },
     # scrolling
     "\x04" => { func => \&cmd_movement_ctrl_d }, # half screen down
     "\x15" => { func => \&cmd_movement_ctrl_u }, # half screen up
     "\x06" => { func => \&cmd_movement_ctrl_f }, # screen down
     "\x02" => { func => \&cmd_movement_ctrl_b }, # screen up
     # window switching
     "\x17" => { func => \&cmd_movement_ctrl_w },
     "\x1e" => { func => \&cmd_movement_ctrl_6 },
     # misc
     '~' => { func => \&cmd_movement_tilde },
     '.' => {},
     '"' => { func => \&cmd_movement_register },
     'g' => { func => \&cmd_movement_g }, # g does many things
     # undo
     'u'    => { func => \&cmd_undo },
     "\x12" => { func => \&cmd_redo }, # ctrl-r
    };

# special movements which take an additional key
my $movements_multiple =
    {
     'f' => undef,
     't' => undef,
     'F' => undef,
     'T' => undef,
     'r' => undef,
     '"' => undef,
     'g' => undef,
     "\x17" => undef, # ctrl-w
    };

# "movements" which can be repeated (additional to operators of course).
my $movements_repeatable
  = {
     'x' => undef,
     'X' => undef,
     'i' => undef,
     'a' => undef,
     'I' => undef,
     'A' => undef,
     'r' => undef,
     'p' => undef,
     'P' => undef,
     'C' => undef,
     'D' => undef,
     '~' => undef,
    };


sub cmd_insert_ctrl_r {
    my ($key) = @_;

    my $char = chr($key);
    return if not defined $registers->{$char} or not $registers->{$char};

    my $pos = _insert_at_position($registers->{$char}, 1, _input_pos());
    _input_pos($pos + 1);
}


sub cmd_operator_c {
    my ($old_pos, $new_pos, $move, $repeat) = @_;

    # Changing a word or WORD doesn't delete the last space before a word, but
    # not if we are on that whitespace before the word.
    if ($move eq 'w' or $move eq 'W') {
        my $input = _input();
        if ($new_pos - $old_pos > 1 and
                substr($input, $new_pos - 1, 1) =~ /\s/) {
            $new_pos--;
        }
    }

    cmd_operator_d($old_pos, $new_pos, $move, $repeat, 1);

    if (!$repeat) {
        _update_mode(M_INS);
    } else {
        my $pos = _input_pos();
        $pos = _insert_buffer(1, $pos);
        _input_pos($pos);
    }
}
sub cmd_operator_d {
    my ($old_pos, $new_pos, $move, $repeat, $change) = @_;

    my ($pos, $length) = _get_pos_and_length($old_pos, $new_pos, $move);

    # Remove the selected string from the input.
    my $input = _input();
    my $string = substr $input, $pos, $length, '';
    if ($register =~ /[A-Z]/) {
        $registers->{lc $register} .= $string;
        print "Deleted into $register: ", $registers->{lc $register} if DEBUG;
    } else {
        $registers->{$register} = $string;
        print "Deleted into $register: ", $registers->{$register} if DEBUG;
    }
    _input($input);

    # Prevent moving after the text when we delete the last character. But not
    # when changing (C).
    $pos-- if $pos == length($input) and !$change;

    # Move the cursor at the right position.
    _input_pos($pos);
}
sub cmd_operator_y {
    my ($old_pos, $new_pos, $move, $repeat) = @_;

    my ($pos, $length) = _get_pos_and_length($old_pos, $new_pos, $move);

    # Extract the selected string and put it in the " register.
    my $input = _input();
    my $string = substr $input, $pos, $length;
    if ($register =~ /[A-Z]/) {
        $registers->{lc $register} .= $string;
        print "Yanked into $register: ", $registers->{lc $register} if DEBUG;
    } else {
        $registers->{$register} = $string;
        print "Yanked into $register: ", $registers->{$register} if DEBUG;
    }

    _input_pos($old_pos);
}
sub _get_pos_and_length {
    my ($old_pos, $new_pos, $move) = @_;

    my $length = $new_pos - $old_pos;
    # We need a positive length and $old_pos must be smaller.
    if ($length < 0) {
        $old_pos = $new_pos;
        $length *= -1;
    }

    # Strip leading a_ or i_ if a text-object was used.
    if ($move =~ /^[ai]_(.)/) {
        $move = $1;
    }

    # Most movement commands don't move one character after the deletion area
    # (which is what we need). For those increase length to support proper
    # selection/deletion.
    if ($move ne 'w' and $move ne 'W' and $move ne 'x' and $move ne 'X' and
        $move ne 'B' and $move ne 'h' and $move ne 'l') {
        $length += 1;
    }

    return ($old_pos, $length);
}


sub cmd_movement_h {
    my ($count, $pos, $repeat) = @_;

    $pos -= $count;
    $pos = 0 if $pos < 0;
    return (undef, $pos);
}
sub cmd_movement_l {
    my ($count, $pos, $repeat) = @_;

    my $length = _input_len();
    $pos += $count;
    $pos = _fix_input_pos($pos, $length);
    return (undef, $pos);
}
sub cmd_movement_space {
    my ($count, $pos, $repeat) = @_;
    return cmd_movement_l($count, $pos);
}

# later history (down)
sub cmd_movement_j {
    my ($count, $pos, $repeat) = @_;

    if (Irssi::version < 20090117) {
        # simulate a down-arrow
        _emulate_keystrokes(0x1b, 0x5b, 0x42);
        return (undef, undef);
    }

    my @history = Irssi::active_win->get_history_lines();

    if (defined $history_index) {
        $history_index += $count;
        print "History Index: $history_index" if DEBUG;
    # Prevent destroying the current input when pressing j after entering
    # command mode. Not exactly like in default irssi, but simplest solution
    # (and S can be used to clear the input line fast, which is what <down>
    # does in plain irssi).
    } else {
        return (undef, undef);
    }

    if ($history_index > $#history) {
        # Restore the input line.
        _input($history_input);
        _input_pos($history_pos);
        $history_index = $#history + 1;
    } elsif ($history_index >= 0) {
        my $history = $history[$history_index];
        # History is not in UTF-8!
        if ($utf8) {
            $history = decode_utf8($history);
        }
        _input($history);
        _input_pos(0);
    }
    return (undef, undef);
}
# earlier history (up)
sub cmd_movement_k {
    my ($count, $pos, $repeat) = @_;

    if (Irssi::version < 20090117) {
        # simulate an up-arrow
        _emulate_keystrokes(0x1b, 0x5b, 0x41);
        return (undef, undef);
    }

    my @history = Irssi::active_win->get_history_lines();

    if (defined $history_index) {
        $history_index -= $count;
        $history_index = 0 if $history_index < 0;
    } else {
        $history_index = $#history;
        $history_input = _input();
        $history_pos = _input_pos();
    }
    print "History Index: $history_index" if DEBUG;
    if ($history_index >= 0) {
        my $history = $history[$history_index];
        # History is not in UTF-8!
        if ($utf8) {
            $history = decode_utf8($history);
        }
        _input($history);
        _input_pos(0);
    }
    return (undef, undef);
}
sub cmd_movement_G {
    my ($count, $pos, $repeat) = @_;

    if (Irssi::version < 20090117) {
        return;
    }

    my @history = Irssi::active_win->get_history_lines();

    # Go to the current input line if no count was given or it's too big.
    if (not $count or $count - 1 >= scalar @history) {
        if (defined $history_input and defined $history_pos) {
            _input($history_input);
            _input_pos($history_pos);
            $history_index = undef;
        }
        return;
    } else {
        # Save input line so it doesn't get lost.
        if (not defined $history_index) {
            $history_input = _input();
            $history_pos = _input_pos();
        }
        $history_index = $count - 1;
    }

    my $history = $history[$history_index];
    # History is not in UTF-8!
    if ($utf8) {
        $history = decode_utf8($history);
    }
    _input($history);
    _input_pos(0);

    return (undef, undef);
}

sub cmd_movement_f {
    my ($count, $pos, $repeat, $char) = @_;

    $pos = _next_occurrence(_input(), $char, $count, $pos);

    $last_ftFT = { type => 'f', char => $char };
    return (undef, $pos);
}
sub cmd_movement_t {
    my ($count, $pos, $repeat, $char) = @_;

    $pos = _next_occurrence(_input(), $char, $count, $pos);
    if (defined $pos) {
        $pos--;
    }

    $last_ftFT = { type => 't', char => $char };
    return (undef, $pos);
}
sub cmd_movement_F {
    my ($count, $pos, $repeat, $char) = @_;

    my $input = reverse _input();
    $pos = _next_occurrence($input, $char, $count, length($input) - $pos - 1);
    if (defined $pos) {
        $pos = length($input) - $pos - 1;
    }

    $last_ftFT = { type => 'F', char => $char };
    return (undef, $pos);
}
sub cmd_movement_T {
    my ($count, $pos, $repeat, $char) = @_;

    my $input = reverse _input();
    $pos = _next_occurrence($input, $char, $count, length($input) - $pos - 1);
    if (defined $pos) {
        $pos = length($input) - $pos - 1 + 1;
    }

    $last_ftFT = { type => 'T', char => $char };
    return (undef, $pos);
}
# Find $count-th next occurrence of $char.
sub _next_occurrence {
    my ($input, $char, $count, $pos) = @_;

    while ($count-- > 0) {
        $pos = index $input, $char, $pos + 1;
        if ($pos == -1) {
            return undef;
        }
    }
    return $pos;
}

sub cmd_movement_semicolon {
    my ($count, $pos, $repeat) = @_;

    return (undef, undef) if not defined $last_ftFT->{type};

    (undef, $pos)
        = $movements->{$last_ftFT->{type}}
                    ->{func}($count, $pos, $repeat, $last_ftFT->{char});
    return (undef, $pos);
}
sub cmd_movement_comma {
    my ($count, $pos, $repeat) = @_;

    return (undef, undef) if not defined $last_ftFT->{type};

    # Change direction.
    my $save = $last_ftFT->{type};
    my $type = $save;
    $type =~ tr/ftFT/FTft/;

    (undef, $pos)
        = $movements->{$type}
                    ->{func}($count, $pos, $repeat, $last_ftFT->{char});
    # Restore type as the move functions overwrites it.
    $last_ftFT->{type} = $save;
    return (undef, $pos);
}

sub cmd_movement_w {
    my ($count, $pos, $repeat) = @_;

    my $input = _input();
    $pos = _beginning_of_word($input, $count, $pos);
    $pos = _fix_input_pos($pos, length $input);
    return (undef, $pos);
}
sub cmd_movement_b {
    my ($count, $pos, $repeat) = @_;

    my $input = reverse _input();
    $pos = length($input) - $pos - 1;
    $pos = 0 if ($pos < 0);

    $pos = _end_of_word($input, $count, $pos);
    $pos = length($input) - $pos - 1;
    $pos = 0 if ($pos < 0);
    return (undef, $pos);
}
sub cmd_movement_e {
    my ($count, $pos, $repeat) = @_;

    my $input = _input();
    $pos = _end_of_word($input, $count, $pos);
    $pos = _fix_input_pos($pos, length $input);
    return (undef, $pos);
}
# Go to the beginning of $count-th word, like vi's w.
sub _beginning_of_word {
    my ($input, $count, $pos) = @_;

    while ($count-- > 0) {
        # Go to end of next word/non-word.
        if (substr($input, $pos) =~ /^$word+/ or
            substr($input, $pos) =~ /^$non_word+/) {
            $pos += $+[0];
        }
        # And skip over any whitespace if necessary. This also happens when
        # we're inside whitespace.
        if (substr($input, $pos) =~ /^\s+/) {
            $pos += $+[0];
        }
    }

    return $pos;
}
# Go to the end of $count-th word, like vi's e.
sub _end_of_word {
    my ($input, $count, $pos) = @_;

    while ($count-- > 0 and length($input) > $pos) {
        my $skipped = 0;
        # Skip over whitespace if in the middle of it or directly after the
        # current word/non-word.
        if (substr($input, $pos + 1) =~ /^\s+/) {
            $pos += $+[0] + 1;
            $skipped = 1;
        }
        elsif (substr($input, $pos) =~ /^\s+/) {
            $pos += $+[0];
            $skipped = 1;
        }
        # We are inside a word/non-word, skip to the end of it.
        if (substr($input, $pos) =~ /^$word{2,}/ or
            substr($input, $pos) =~ /^$non_word{2,}/) {
            $pos += $+[0] - 1;
        # We are the border of word/non-word. Skip to the end of the next one.
        # But not if we've already jumped over whitespace because there could
        # be only one word/non-word char after the whitespace.
        } elsif (!$skipped and (substr($input, $pos) =~ /^$word($non_word+)/ or
                                substr($input, $pos) =~ /^$non_word($word+)/)) {
            $pos += $+[0] - 1;
        }
    }

    # Necessary for correct deletion at the end of the line.
    if (length $input == $pos + 1) {
        $pos++;
    }

    return $pos;
}
sub cmd_movement_W {
    my ($count, $pos, $repeat) = @_;

    my $input = _input();
    $pos = _beginning_of_WORD($input, $count, $pos);
    $pos = _fix_input_pos($pos, length $input);
    return (undef, $pos);
}
sub cmd_movement_B {
    my ($count, $pos, $repeat) = @_;

    my $input = reverse _input();
    $pos = _end_of_WORD($input, $count, length($input) - $pos - 1);
    if ($pos == -1) {
        return cmd_movement_0();
    } else {
        return (undef, length($input) - $pos - 1);
    }
}
sub cmd_movement_E {
    my ($count, $pos, $repeat) = @_;

    $pos = _end_of_WORD(_input(), $count, $pos);
    if ($pos == -1) {
        return cmd_movement_dollar();
    } else {
        return (undef, $pos);
    }
}
# Go to beginning of $count-th WORD, like vi's W.
sub _beginning_of_WORD {
    my ($input, $count, $pos) = @_;

    # Necessary for correct movement between two words with only one
    # whitespace.
    if (substr($input, $pos) =~ /^\s\S/) {
        $pos++;
        $count--;
    }

    while ($count-- > 0 and length($input) > $pos) {
        if (substr($input, $pos + 1) !~ /\s+/) {
            return length($input);
        }
        $pos += $+[0] + 1;
    }

    return $pos;
}
# Go to end of $count-th WORD, like vi's E.
sub _end_of_WORD {
    my ($input, $count, $pos) = @_;

    return $pos if $pos >= length($input);

    # We are inside a WORD, skip to the end of it.
    if (substr($input, $pos + 1) =~ /^\S+(\s)/) {
        $pos += $-[1];
        $count--;
    }

    while ($count-- > 0) {
        if (substr($input, $pos) !~ /\s+\S+(\s+)/) {
            return -1;
        }
        $pos += $-[1] - 1;
    }
    return $pos;
}

sub cmd_movement_i_ {
    my ($count, $pos, $repeat, $char) = @_;

    _warn("i_ not implemented yet");
    return (undef, undef);
}
sub cmd_movement_a_ {
    my ($count, $pos, $repeat, $char) = @_;

    my $cur_pos;
    my $input = _input();

    # aw and aW
    if ($char eq 'w' or $char eq 'W') {
        while ($count-- > 0 and length($input) > $pos) {
            if (substr($input, $pos, 1) =~ /\s/) {
                # Any whitespace before the word/WORD must be removed.
                if (not defined $cur_pos) {
                    $cur_pos = _find_regex_before($input, '\S', $pos, 0);
                    if ($cur_pos < 0) {
                        $cur_pos = 0;
                    } else {
                        $cur_pos++;
                    }
                }
                # Move before the word/WORD.
                if (substr($input, $pos + 1) =~ /^\s+/) {
                    $pos += $+[0];
                }
                # And delete the word.
                if ($char eq 'w') {
                    if (substr($input, $pos) =~ /^\s($word+|$non_word+)/) {
                        $pos += $+[0];
                    } else {
                        $pos = length($input);
                    }
                # WORD
                } else {
                    if (substr($input, $pos + 1) =~ /\s/) {
                        $pos += $-[0] + 1;
                    } else {
                        $pos = length($input);
                    }
                }

            # word
            } elsif ($char eq 'w') {
                # Start at the beginning of this WORD.
                if (not defined $cur_pos and $pos > 0 and substr($input, $pos - 1, 2) !~ /(\s.|$word$non_word|$non_word$word)/) {

                    $cur_pos = _find_regex_before($input, "^($word+$non_word|$non_word+$word|$word+\\s|$non_word+\\s)", $pos, 1);
                    if ($cur_pos < 0) {
                        $cur_pos = 0;
                    } else {
                        $cur_pos += 2;
                    }
                }
                # Delete to the end of the word.
                if (substr($input, $pos) =~ /^($word+$non_word|$non_word+$word|$word+\s+\S|$non_word+\s+\S)/) {
                    $pos += $+[0] - 1;
                } else {
                    $pos = length($input);
                    # If we are at the end of the line, whitespace before
                    # the word is also deleted.
                    my $new_pos = _find_regex_before($input, "^($word+\\s+|$non_word+\\s+)", $pos, 1);
                    if ($new_pos != -1 and (not defined $cur_pos or $cur_pos > $new_pos + 1)) {
                        $cur_pos = $new_pos + 1;
                    }
                }

            # WORD
            } else {
                # Start at the beginning of this WORD.
                if (not defined $cur_pos and $pos > 0 and
                        substr($input, $pos - 1, 1) !~ /\s/) {
                    $cur_pos = _find_regex_before($input, '\s', $pos - 1, 0);
                    if ($cur_pos < 0) {
                        $cur_pos = 0;
                    } else {
                        $cur_pos++;
                    }
                }
                # Delete to the end of the word.
                if (substr($input, $pos + 1) =~ /^\S*\s+\S/) {
                    $pos += $+[0];
                } else {
                    $pos = length($input);
                    # If we are at the end of the line, whitespace before
                    # the WORD is also deleted.
                    my $new_pos = _find_regex_before($input, '\s+', $pos, 1);
                    if (not defined $cur_pos or $cur_pos > $new_pos + 1) {
                        $cur_pos = $new_pos + 1;
                    }
                }
            }
        }
    }

    return ($cur_pos, $pos);
}
# Find regex as close as possible before the current position. If $end is true
# the end of the match is returned, otherwise the beginning.
sub _find_regex_before {
    my ($input, $regex, $pos, $end) = @_;

    $input = reverse $input;
    $pos = length($input) - $pos - 1;
    $pos = 0 if $pos < 0;

    if (substr($input, $pos) =~ /$regex/) {
        if (!$end) {
            $pos += $-[0];
        } else {
            $pos += $+[0];
        }
        return length($input) - $pos - 1;
    } else {
        return -1;
    }
}

sub cmd_movement_0 {
    return (undef, 0);
}
sub cmd_movement_caret {
    my $input = _input();
    my $pos;
    # No whitespace at all.
    if ($input !~ m/^\s/) {
        $pos = 0;
    # Some non-whitespace, go to first one.
    } elsif ($input =~ m/[^\s]/) {
        $pos = $-[0];
    # Only whitespace, go to the end.
    } else {
        $pos = _fix_input_pos(length $input, length $input);
    }
    return (undef, $pos);
}
sub cmd_movement_dollar {
    my $length = _input_len();
    return (undef, _fix_input_pos($length, $length));
}

sub cmd_movement_x {
    my ($count, $pos, $repeat) = @_;

    cmd_operator_d($pos, $pos + $count, 'x');
    return (undef, undef);
}
sub cmd_movement_X {
    my ($count, $pos, $repeat) = @_;

    return (undef, undef) if $pos == 0;

    my $new = $pos - $count;
    $new = 0 if $new < 0;
    cmd_operator_d($pos, $new, 'X');
    return (undef, undef);
}

sub cmd_movement_i {
    my ($count, $pos, $repeat) = @_;

    if (!$repeat) {
        _update_mode(M_INS);
    } else {
        $pos = _insert_buffer($count, $pos);
    }
    return (undef, $pos);
}
sub cmd_movement_I {
    my ($count, $pos, $repeat) = @_;

    $pos = cmd_movement_caret();
    if (!$repeat) {
        _update_mode(M_INS);
    } else {
        $pos = _insert_buffer($count, $pos);
    }
    return (undef, $pos);
}
sub cmd_movement_a {
    my ($count, $pos, $repeat) = @_;

    # Move after current character. Can't use cmd_movement_l() because we need
    # to mover after last character at the end of the line.
    my $length = _input_len();
    $pos += 1;
    $pos = $length if $pos > $length;

    if (!$repeat) {
        _update_mode(M_INS);
    } else {
        $pos = _insert_buffer($count, $pos);
    }
    return (undef, $pos);
}
sub cmd_movement_A {
    my ($count, $pos, $repeat) = @_;

    $pos = _input_len();

    if (!$repeat) {
        _update_mode(M_INS);
    } else {
        $pos = _insert_buffer($count, $pos);
    }
    return (undef, $pos);
}
# Add @insert_buf to _input() at the given position.
sub _insert_buffer {
    my ($count, $pos) = @_;
    return _insert_at_position(join('', @insert_buf), $count, $pos);
}
sub _insert_at_position {
    my ($string, $count, $pos) = @_;

    $string = $string x $count;

    my $input = _input();
    # Check if we are not at the end of the line to prevent substr outside of
    # string error.
    if (length $input > $pos) {
        substr($input, $pos, 0) = $string;
    } else {
        $input .= $string;
    }
    _input($input);

    return $pos - 1 + length $string;
}

sub cmd_movement_r {
    my ($count, $pos, $repeat, $char) = @_;

    my $input = _input();

    # Abort if at end of the line.
    return (undef, undef) if length($input) < $pos + $count;

    substr $input, $pos, $count, $char x $count;
    _input($input);
    return (undef, $pos + $count - 1);
}

sub cmd_movement_p {
    my ($count, $pos, $repeat) = @_;
    $pos = _paste_at_position($count, $pos + 1);
    return (undef, $pos);
}
sub cmd_movement_P {
    my ($count, $pos, $repeat) = @_;
    $pos = _paste_at_position($count, $pos);
    return (undef, $pos);
}
sub _paste_at_position {
    my ($count, $pos) = @_;

    return if not $registers->{$register};
    return _insert_at_position($registers->{$register}, $count, $pos);
}

sub cmd_movement_ctrl_d {
    my ($count, $pos, $repeat) = @_;

    my $window = Irssi::active_win();
    # no count = half of screen
    if (not defined $count) {
        $count = $window->{height} / 2;
    }
    $window->view()->scroll($count);
    return (undef, undef);
}
sub cmd_movement_ctrl_u {
    my ($count, $pos, $repeat) = @_;

    my $window = Irssi::active_win();
    # no count = half of screen
    if (not defined $count) {
        $count = $window->{height} / 2;
    }
    $window->view()->scroll($count * -1);
    return (undef, undef);
}
sub cmd_movement_ctrl_f {
    my ($count, $pos, $repeat) = @_;

    my $window = Irssi::active_win();
    $window->view()->scroll($count * $window->{height});
    return (undef, undef);
}
sub cmd_movement_ctrl_b {
    my ($count, $pos, $repeat) = @_;

    cmd_movement_ctrl_f($count * -1, $pos, $repeat);
    return (undef, undef);
}

sub cmd_movement_ctrl_w {
    my ($count, $pos, $repeat, $char) = @_;

    if ($char eq 'j') {
        while ($count -- > 0) {
            Irssi::command('window down');
        }
    } elsif ($char eq 'k') {
        while ($count -- > 0) {
            Irssi::command('window up');
        }
    }
    return (undef, undef);
}
sub cmd_movement_ctrl_6 {
    # like :b#
    Irssi::command('window last');
    return (undef, undef);
}

sub cmd_movement_tilde {
    my ($count, $pos, $repeat) = @_;

    my $input = _input();
    my $string = substr $input, $pos, $count;
    $string =~ s/(.)/(uc($1) eq $1) ? lc($1) : uc($1)/ge;
    substr $input, $pos, $count, $string;

    _input($input);
    return (undef, _fix_input_pos($pos + $count, length $input));
}

sub cmd_movement_register {
    my ($count, $pos, $repeat, $char) = @_;

    if (not exists $registers->{$char} and not exists $registers->{lc $char}) {
        print "Wrong register $char, ignoring." if DEBUG;
        return (undef, undef);
    }

    # make sure black hole register is always empty
    if ($char eq '_') {
        $registers->{_} = '';
    }

    # + and * contain both irssi's cut-buffer
    if ($char eq '+' or $char eq '*') {
        $registers->{'+'} = Irssi::parse_special('$U');
        $registers->{'*'} = $registers->{'+'};
    }

    $register = $char;
    print "Changing register to $register" if DEBUG;
    return (undef, undef);
}

sub cmd_movement_g {
    my ($count, $pos, $repeat, $char) = @_;

    my $input = _input();
    # ge
    if ($char eq 'e') {
        $input = reverse $input;
        $pos = length($input) - $pos - 1;
        $pos = 0 if ($pos < 0);

        $pos = _beginning_of_word($input, $count, $pos);
        $pos = length($input) - $pos - 1;
        $pos = 0 if ($pos < 0);
    # gE
    } elsif ($char eq 'E') {
        $input = reverse $input;
        $pos = _beginning_of_WORD($input, $count, length($input) - $pos - 1);
        if ($pos == -1 or length($input) - $pos - 1 == -1) {
            return cmd_movement_0();
        } else {
            $pos = length($input) - $pos - 1;
        }
    }
    return (undef, $pos);
}

sub cmd_undo {
    print "Undo!" if DEBUG;

    if ($undo_index != $#undo_buffer) {
        $undo_index++;
        _restore_undo_entry($undo_index);
        print "Undoing entry index: $undo_index of " . scalar(@undo_buffer)
            if DEBUG;
    } else {
        print "No further undo." if DEBUG;
    }
    return (undef, undef);
}
sub cmd_redo {
    print "Redo!" if DEBUG;

    if ($undo_index != 0) {
        $undo_index--;
        print "Undoing entry index: $undo_index of " . scalar(@undo_buffer)
            if DEBUG;
        _restore_undo_entry($undo_index);
    } else {
        print "No further Redo." if DEBUG;
    }
    return (undef, undef);
}

# Adapt the input position depending if an operator is active or not.
sub _fix_input_pos {
    my ($pos, $length) = @_;

    # Allow moving past the last character when an operator is active to allow
    # correct handling of last character in line.
    if ($operator) {
        $pos = $length if $pos > $length;
    # Otherwise forbid it.
    } else {
        $pos = $length - 1 if $pos > $length - 1;
    }

    return $pos;
}


sub cmd_ex_command {
    my $arg_str = join '', @ex_buf;
    if ($arg_str =~ m|^s/(.+)/(.*)/([ig]*)|) {
        my ($search, $replace, $flags) = ($1, $2, $3);
        print "Searching for $search, replace: $replace, flags; $flags"
          if DEBUG;

        my $rep_fun = sub { $replace };

        my $line = _input();
        my @re_flags = split '', defined $flags?$flags:'';

        if (scalar grep { $_ eq 'i' } @re_flags) {
            $search = '(?i)' . $search;
        }

        print "Search is $search" if DEBUG;

        my $re_pattern = qr/$search/;

        if (scalar grep { $_ eq 'g' } @re_flags) {
            $line =~ s/$re_pattern/$rep_fun->()/eg;
        } else {
            print "Single replace: $replace" if DEBUG;
            $line =~ s/$re_pattern/$rep_fun->()/e;
        }

        print "New line is: $line" if DEBUG;
        _input($line);
    # :bn
    } elsif ($arg_str eq 'bn') {
        Irssi::command('window next');
    # :bp
    } elsif ($arg_str eq 'bp') {
        Irssi::command('window previous');
    # :bd
    } elsif ($arg_str eq 'bd') {
        Irssi::command('window close');
    # :b[buffer] {args}
    } elsif ($arg_str =~ m|^b(?:uffer)?\s*(.+)$|) {
        my $window;
        my $item;
        my $buffer = $1;

        # Go to window number.
        if ($buffer =~ /^[0-9]+$/) {
            $window = Irssi::window_find_refnum($buffer);
        # Go to previous window.
        } elsif ($buffer eq '#') {
            Irssi::command('window last');
        # Go to best regex matching window.
        } else {
            my $matches = _matching_windows($buffer);
            if (scalar @$matches > 0) {
                $window = @$matches[0]->{window};
                $item = @$matches[0]->{item};
            }
        }

        if ($window) {
            $window->set_active();
            if ($item) {
                $item->set_active();
            }
        }

    # :reg[isters] {arg} and :di[splay] {arg}
    } elsif ($arg_str =~ /^(?:reg(?:isters)?|di(?:splay)?)(?:\s+(.+)$)?/) {
        my @regs;
        if ($1) {
            my $regs = $1;
            $regs =~ s/\s+//g;
            @regs = split //, $regs;
        } else {
            @regs = keys %$registers;
        }
        my $active_window = Irssi::active_win;
        foreach my $key (sort @regs) {
            next if $key eq '_'; # skip black hole
            if (defined $registers->{$key}) {
                $active_window->print("register $key: $registers->{$key}");
            }
        }
    # :ls and :buffers
    } elsif ($arg_str eq 'ls' or $arg_str eq 'buffers') {
        Irssi::command('window list');
    } elsif ($arg_str eq 'undol' or $arg_str eq 'undolist') {
        _print_undo_buffer();
    }
}

sub _matching_windows {
    my ($buffer) = @_;

    my $server;

    if ($buffer =~ m{^(.+)/(.+)}) {
        $server = $1;
        $buffer = $2;
    }

    print ":b searching for channel $buffer" if DEBUG;
    print ":b on server $server" if $server and DEBUG;

    my @matches;
    foreach my $window (Irssi::windows()) {
        # Matching window names.
        if ($window->{name} =~ /$buffer/i) {
            my $win_ratio = ($+[0] - $-[0]) / length($window->{name});
            push @matches, { window => $window,
                               item => undef,
                              ratio => $win_ratio,
                               text => $window->{name} };
            print ":b $window->{name}: $win_ratio" if DEBUG;
        }
        # Matching Window item names (= channels).
        foreach my $item ($window->items()) {
            # Wrong server.
            if ($server and (!$item->{server} or
                              $item->{server}->{chatnet} !~ /^$server/i)) {
                next;
            }
            if ($item->{name} =~ /$buffer/i) {
                my $length = length($item->{name});
                $length-- if index($item->{name}, '#') == 0;
                my $item_ratio = ($+[0] - $-[0]) / $length;
                push @matches, { window => $window,
                                   item => $item,
                                  ratio => $item_ratio,
                                   text => $item->{name} };
                print ":b $window->{name} $item->{name}: $item_ratio" if DEBUG;
            }
        }
    }

    @matches = sort {$b->{ratio} <=> $a->{ratio}} @matches;

    return \@matches;
}


# vi mode status item.
sub vim_mode_cb {
    my ($sb_item, $get_size_only) = @_;
    my $mode_str = '';
    if ($mode == M_INS) {
        $mode_str = 'Insert';
    } elsif ($mode == M_EX) {
        $mode_str = '%_Ex%_';
    } else {
        $mode_str = '%_Command%_';
        if ($register ne '"' or $numeric_prefix or $operator or $movement) {
            $mode_str .= ' (';
            if ($register ne '"') {
                $mode_str .= '"' . $register;
            }
            if ($numeric_prefix) {
                $mode_str .= $numeric_prefix;
            }
            if ($operator) {
                $mode_str .= $operator;
            }
            if ($movement) {
                $mode_str .= $movement;
            }
            $mode_str .= ')';
        }
    }
    $sb_item->default_handler($get_size_only, "{sb $mode_str}", '', 0);
}

# :b window list item.
sub b_windows_cb {
    my ($sb_item, $get_size_only) = @_;

    my $windows = '';

    # A little code duplication of cmd_ex_command()!
    my $arg_str = join '', @ex_buf;
    if ($arg_str =~ m|b(?:uffer)?\s*(.+)$|) {
        my $buffer = $1;
        if ($buffer !~ /^[0-9]$/ and $buffer ne '#') {
            # Display matching windows.
            my $matches = _matching_windows($buffer);
            $windows = join ',', map { $_->{text} } @$matches;
        }
    }

    $sb_item->default_handler($get_size_only, "{sb $windows}", '', 0);
}


sub got_key {
    my ($key) = @_;

    return if ($should_ignore);

    # Esc key
    if ($key == 27) {
        print "Esc seen, starting buffer" if DEBUG;
        $input_buf_enabled = 1;

        # NOTE: this timeout might be too low on laggy systems, but
        # it comes at the cost of keystroke latency for things that
        # contain escape sequences (arrow keys, etc)
        $input_buf_timer
          = Irssi::timeout_add_once(10, \&handle_input_buffer, undef);

    } elsif ($mode == M_INS) {
        if ($key == 3) { # Ctrl-C enter command mode
            _update_mode(M_CMD);
            _stop();
            return;

        } elsif ($key == 10) { # enter.
            _commit_line();

        } elsif ($input_buf_enabled and $imap) {
            print "Imap $imap active" if DEBUG;
            my $map = $imaps->{$imap};
            if (not defined $map->{map} or chr($key) eq $map->{map}) {
                $map->{func}($key);
                # Clear the buffer so the imap is not printed.
                @input_buf = ();
            } else {
                push @input_buf, $key;
            }
            flush_input_buffer();
            _stop();
            $imap = undef;
            return;

        } elsif (exists $imaps->{chr($key)}) {
            print "Imap " . chr($key) . " seen, starting buffer" if DEBUG;

            # start imap pending mode
            $imap = chr($key);

            $input_buf_enabled = 1;
            push @input_buf, $key;
            $input_buf_timer
              = Irssi::timeout_add_once(500, \&flush_input_buffer, undef);

            _stop();
            return;

        # Pressing delete resets insert mode repetition.
        # TODO: maybe allow it
        } elsif ($key == 127) {
            @insert_buf = ();
        # All other entered characters need to be stored to allow repeat of
        # insert mode. Ignore delete and ctrl characters.
        } elsif ($key > 31) {
            push @insert_buf, chr($key);
        }
    }

    if ($input_buf_enabled) {
        push @input_buf, $key;
        _stop();
        return;
    }

    if ($mode == M_CMD) {
        handle_command_cmd($key);
    } elsif ($mode == M_EX) {
        handle_command_ex($key);
    }
}

sub handle_input_buffer {

    Irssi::timeout_remove($input_buf_timer);
    $input_buf_timer = undef;
    # see what we've collected.
    print "Input buffer contains: ", join(", ", @input_buf) if DEBUG;

    if (@input_buf == 1 && $input_buf[0] == 27) {

        print "Enter Command Mode" if DEBUG;
        _update_mode(M_CMD);

    } else {
        # we need to identify what we got, and either replay it
        # or pass it off to the command handler.
        # if ($mode == M_CMD) {
        #     # command
        #     my $key_str = join '', map { chr } @input_buf;
        #     if ($key_str =~ m/^\e\[([ABCD])/) {
        #         print "Arrow key: $1" if DEBUG;
        #     } else {
        #         print "Dunno what that is." if DEBUG;
        #     }
        # } else {
        #     _emulate_keystrokes(@input_buf);
        # }
        _emulate_keystrokes(@input_buf);

        # Clear insert buffer, pressing "special" keys (like arrow keys)
        # resets it.
        @insert_buf = ();
    }

    @input_buf = ();
    $input_buf_enabled = 0;
}

sub flush_input_buffer {
    Irssi::timeout_remove($input_buf_timer);
    $input_buf_timer = undef;
    # see what we've collected.
    print "Input buffer flushed" if DEBUG;

    # Add the characters to @insert_buf so they can be repeated.
    push @insert_buf, map chr, @input_buf;

    _emulate_keystrokes(@input_buf);

    @input_buf = ();
    $input_buf_enabled = 0;

    $imap = undef;
}

sub handle_numeric_prefix {
    my ($char) = @_;
    my $num = 0+$char;

    if (defined $numeric_prefix) {
        $numeric_prefix *= 10;
        $numeric_prefix += $num;
    } else {
        $numeric_prefix = $num;
    }
}

sub handle_command_cmd {
    my ($key) = @_;

    my $should_stop = 1;

    my $char = chr($key);

    # We need to treat $movements_multiple specially as they need another
    # argument.
    if ($movement) {
        $movement .= $char;
    }

    # s is an alias for cl.
    if (!$movement and !$operator and $char eq 's') {
        print "Changing s to cl" if DEBUG;
        $char = 'l';
        $operator = 'c';
    }
    # S is an alias for cc.
    if (!$movement and !$operator and $char eq 'S') {
        print "Changing S to cc" if DEBUG;
        $char = 'c';
        $operator = 'c';
    }

    if (!$movement && ($char =~ m/[1-9]/ ||
                       ($numeric_prefix && $char =~ m/[0-9]/))) {
        print "Processing numeric prefix: $char" if DEBUG;
        handle_numeric_prefix($char);

    # text-objects (i a) are simulated with $movement
    } elsif (!$movement && (exists $movements_multiple->{$char}
                            or $operator and ($char eq 'i' or $char eq 'a'))) {
        print "Processing movement: $char" if DEBUG;
        $movement = $char;

    } elsif (!$movement && exists $operators->{$char}) {
        print "Processing operator: $char" if DEBUG;

        # Abort operator if we already have one pending.
        if ($operator) {
            # But allow cc/dd/yy.
            if ($operator eq $char) {
                print "Processing operator: ", $operator, $char if DEBUG;
                my $pos = _input_pos();
                $operators->{$operator}->{func}->(0, _input_len(), '', 0);
                # Restore position for yy.
                if ($char eq 'y') {
                    _input_pos($pos);
                }
                if ($register ne '"') {
                    print 'Changing register to "' if DEBUG;
                    $register = '"';
                }
            }
            $numeric_prefix = undef;
            $operator = undef;
            $movement = undef;
        # Set new operator.
        } else {
            $operator = $char;
        }

    } elsif ($movement || exists $movements->{$char}) {
        print "Processing movement command: $char" if DEBUG;

        my $skip = 0;
        my $repeat = 0;

        if (!$movement) {
            # . repeats the last command.
            if ($char eq '.' and defined $last->{char}) {
                $char = $last->{char};
                # If . is given a count then it replaces original count.
                if (not defined $numeric_prefix) {
                    $numeric_prefix = $last->{numeric_prefix};
                }
                $operator = $last->{operator};
                $movement = $last->{movement};
                $register = $last->{register};
                $repeat = 1;
            } elsif ($char eq '.') {
                print '. pressed but $last->{char} not set' if DEBUG;
                $skip = 1;
            }
            # C and D force the matching operator
            if ($char eq 'C') {
                $operator = 'c';
            } elsif ($char eq 'D') {
                $operator = 'd';
            }
        }

        if ($skip) {
            print "Skipping movement and operator." if DEBUG;
        } else {
            # Make sure count is at least 1 except for functions which need to
            # know if no count was used
            if (not $numeric_prefix and $char ne "\x04"    # ctrl-d
                                    and $char ne "\x15"    # ctrl-u
                                    and $char ne 'G') {
                $numeric_prefix = 1;
            }

            my $cur_pos = _input_pos();

            # If defined $cur_pos will be changed to this.
            my $old_pos;
            # Position after the move.
            my $new_pos;
            # Execute the movement (multiple times).
            if (not $movement) {
                ($old_pos, $new_pos)
                    = $movements->{$char}->{func}
                                ->($numeric_prefix, $cur_pos, $repeat);
            } else {
                # Use the real movement command (like t or f) for operator
                # below.
                $char = substr $movement, 0, 1;
                # i_ and a_ represent text-objects.
                if ($char eq 'i' or $char eq 'a') {
                    $char .= '_';
                }
                ($old_pos, $new_pos)
                    = $movements->{$char}->{func}
                                ->($numeric_prefix, $cur_pos, $repeat,
                                   substr $movement, 1);
            }
            if (defined $old_pos) {
                print "Changing \$cur_pos from $cur_pos to $old_pos" if DEBUG;
                $cur_pos = $old_pos;
            }
            if (defined $new_pos) {
                _input_pos($new_pos);
            } else {
                $new_pos = _input_pos();
            }

            # Update input position of last undo entry so that undo/redo
            # restores correct position.
            if (@undo_buffer and _input() eq $undo_buffer[0]->[0] and
                ((defined $operator and $operator eq 'd') or
                 exists $movements_repeatable->{$char} or $char eq '.')) {
                print "Updating history position: $undo_buffer[0]->[0]"
                    if DEBUG;
                $undo_buffer[0]->[1] = $cur_pos;
            }

            # If we have an operator pending then run it on the handled text.
            # But only if the movement changed the position (this prevents
            # problems with e.g. f when the search string doesn't exist).
            if ($operator and $cur_pos != $new_pos) {
                print "Processing operator: ", $operator if DEBUG;
                # If text-objects are used the real move character must also
                # be passed to the operator.
                my $tmp_char = $char;
                if ($char eq 'i_' or $char eq 'a_') {
                    $tmp_char .= substr $movement, 1;
                }
                $operators->{$operator}->{func}->($cur_pos, $new_pos,
                                                  $tmp_char, $repeat);
            }

            # Save an undo checkpoint here for operators, all repeatable
            # movements, operators and repetition.
            if ((defined $operator and $operator eq 'd') or
                exists $movements_repeatable->{$char} or $char eq '.') {
                # TODO: why do histpry entries still show up in undo
                # buffer? Is avoiding the commands here insufficient?

                _add_undo_entry(_input(), _input_pos());
            }

            # Store command, necessary for .
            if ($operator or exists $movements_repeatable->{$char}) {
                $last->{char} = $char;
                $last->{numeric_prefix} = $numeric_prefix;
                $last->{operator} = $operator;
                $last->{movement} = $movement;
                $last->{register} = $register;
            }
        }

        # Reset the count unless we go into insert mode, _update_mode() needs
        # to know it when leaving insert mode to support insert with counts
        # (like 3i).
        if ($repeat or ($char ne 'i' and $char ne 'I' and $char ne 'a' and $char ne 'A')) {
            $numeric_prefix = undef;
        }
        $operator = undef;
        $movement = undef;

        if ($char ne '"' and $register ne '"') {
            print 'Changing register to "' if DEBUG;
            $register = '"';
        }

    # Start Ex mode.
    } elsif ($char eq ':') {
        if (not script_is_loaded('prompt_info')) {
            _warn("Warning: Ex mode requires the 'prompt_info' script. " .
                    "Please load it and try again.");
        } else {
            _update_mode(M_EX);
            _set_prompt(':');
        }

    # Enter key sends the current input line in command mode as well.
    } elsif ($key == 10) {
        $should_stop = 0;
        _commit_line();
    }

    Irssi::statusbar_items_redraw("vim_mode");

    _stop() if $should_stop;
}

sub handle_command_ex {
    my ($key) = @_;

    # DEL key - remove last character
    if ($key == 127) {
        print "Delete" if DEBUG;
        pop @ex_buf;
        _set_prompt(':' . join '', @ex_buf);

    # Return key - execute command
    } elsif ($key == 10) {
        print "Run ex-mode command" if DEBUG;
        cmd_ex_command();
        @ex_buf = ();
        _update_mode(M_CMD);

    # Append entered key
    } else {
        push @ex_buf, chr $key;
        _set_prompt(':' . join '', @ex_buf);
    }

    Irssi::statusbar_items_redraw("vim_windows");

    _stop();
}


sub vim_mode_init {
    Irssi::signal_add_first 'gui key pressed' => \&got_key;
    Irssi::signal_add 'setup changed' => \&setup_changed;
    Irssi::statusbar_item_register ('vim_mode', 0, 'vim_mode_cb');
    Irssi::statusbar_item_register ('vim_windows', 0, 'b_windows_cb');

    Irssi::settings_add_str('vim_mode', 'vim_mode_cmd_seq', '');
    Irssi::settings_add_bool('vim_mode', 'vim_mode_debug', 0);
    Irssi::settings_add_bool('vim_mode', 'vim_mode_utf8', 1);
    Irssi::settings_add_int('vim_mode', 'vim_mode_max_undo_lines', 50);

    setup_changed();
    _reset_undo_buffer();
}

sub setup_changed {
    my $value;

    # Delete all possible imaps created by /set vim_mode_cmd_seq.
    foreach my $char ('a' .. 'z') {
        delete $imaps->{$char};
    }

    $value = Irssi::settings_get_str('vim_mode_cmd_seq');
    if ($value) {
        if (length $value == 1) {
            $imaps->{$value} = { 'map'  => $value,
                                 'func' => sub { _update_mode(M_CMD) }
                               };
        } else {
            _warn("Error: vim_mode_cmd_seq must be a single character");
        }
    }

    $DEBUG_ENABLED = Irssi::settings_get_bool('vim_mode_debug');

    my $new_utf8 = Irssi::settings_get_bool('vim_mode_utf8');

    if ($new_utf8 != $utf8) {
        # recompile the patterns when switching to/from utf-8
        $word     = qr/[\w_]/o;
        $non_word = qr/[^\w_\s]/o;
    }

    if ($new_utf8 and (!$^V or $^V lt v5.8.1)) {
        _warn("Warning: UTF-8 isn't supported very well in perl < 5.8.1! " .
              "Please disable the vim_mode_utf8 setting.");
    }

    $utf8 = $new_utf8;
}

sub UNLOAD {
    Irssi::signal_remove('gui key pressed' => \&got_key);
    Irssi::statusbar_item_unregister ('vim_mode');
    Irssi::statusbar_item_unregister ('vim_windows');

}

sub _add_undo_entry {
    my ($line, $pos) = @_;

    # If we aren't at the top of the history stack, then drop newer entries as
    # we can't branch (yet).
    while ($undo_index > 0) {
        shift @undo_buffer;
        $undo_index--;
    }

    # check it's not a dupe of the list head
    my $current = $undo_buffer[$undo_index];
    if ($line eq $current->[0] && $pos == $current->[1]) {
        print "Not adding duplicate to undo list" if DEBUG;
    } elsif ($line eq $current->[0]) {
        print "Updating position of undo list at $undo_index" if DEBUG;
        $undo_buffer[$undo_index]->[1] = $pos;
    } else {
        print "adding $line ($pos) to undo list" if DEBUG;
        # add to the front of the buffer
        unshift @undo_buffer, [$line, $pos];
        $undo_index = 0;
    }
    my $max = Irssi::settings_get_int('vim_mode_max_undo_lines');
}

sub _restore_undo_entry {
    my $entry = $undo_buffer[$undo_index];
    _input($entry->[0]);
    _input_pos($entry->[1]);
}

sub _print_undo_buffer {

    my $i = 0;
    my @buf;
    foreach my $entry (@undo_buffer) {
        my $str = '';
        if ($i == $undo_index) {
            $str .= '* ';
        } else {
            $str .= '  ';
        }
        my ($line, $pos) = @$entry;
        substr($line, $pos, 0) = '*';
        # substr($line, $pos+3, 0) = '%_';

        $str .= sprintf('%02d %s [%d]', $i, $line, $pos);
        push @buf, $str;
        $i++;
    }
    print "------ undo buffer ------";
    print join("\n", @buf);
    print "------------------ ------";

}

sub _reset_undo_buffer {
    my ($line, $pos) = @_;
    $line = _input()     unless defined $line;
    $pos  = _input_pos() unless defined $pos;

    print "Clearing undo buffer" if DEBUG;
    @undo_buffer = ([$line, $pos]);
    $undo_index  = 0;
}


sub _commit_line {
    _update_mode(M_INS);
    _reset_undo_buffer('', 0);
}

sub _input {
    my ($data) = @_;

    my $current_data = Irssi::parse_special('$L', 0, 0);

    if ($utf8) {
        $current_data = decode_utf8($current_data);
    }

    if (defined $data) {
        if ($utf8) {
            Irssi::gui_input_set(encode_utf8($data));
        } else {
            Irssi::gui_input_set($data);
        }
    } else {
        $data = $current_data;
    }

    return $data;
}

sub _input_len {
    return length _input();
}

sub _input_pos {
    my ($pos) = @_;
    my $cur_pos = Irssi::gui_input_get_pos();
    # my $dpos = defined $pos?$pos:'undef';
    # my @call = caller(1);
    # my $cfunc = $call[3];
    # $cfunc =~ s/^.*?::([^:]+)$/$1/;
    # print "pos called from line: $call[2] sub: $cfunc pos: $dpos, cur_pos: $cur_pos"
    #   if DEBUG;

    if (defined $pos) {
        #print "Input pos being set from $cur_pos to $pos" if DEBUG;
        Irssi::gui_input_set_pos($pos) if $pos != $cur_pos;
    } else {
        $pos = $cur_pos;
        #print "Input pos retrieved as $pos" if DEBUG;
    }

    return $pos;
}

sub _emulate_keystrokes {
    my @keys = @_;
    $should_ignore = 1;
    for my $key (@keys) {
        Irssi::signal_emit('gui key pressed', $key);
    }
    $should_ignore = 0;
}

sub _stop() {
    Irssi::signal_stop_by_name('gui key pressed');
}

sub _update_mode {
    my ($new_mode) = @_;

    my $pos;

    if ($mode == M_INS and $new_mode == M_CMD) {
        # Support counts with insert modes, like 3i.
        if ($numeric_prefix and $numeric_prefix > 1) {
            $pos = _insert_buffer($numeric_prefix - 1, _input_pos());
            _input_pos($pos);
            $numeric_prefix = undef;

        # In insert mode we are "between" characters, in command mode "on top"
        # of keys. When leaving insert mode we have to move on key left to
        # accomplish that.
        } else {
            $pos = _input_pos();
            if ($pos != 0) {
                _input_pos($pos - 1);
            }
        }
        # Store current line to allow undo of i/a/I/A.
        _add_undo_entry(_input(), _input_pos());

    # Change mode to i to support insert mode repetition. This doesn't affect
    # commands like i/a/I/A because handle_command_cmd() sets $last->{char}.
    # It's necessary when pressing enter.
    } elsif ($mode == M_CMD and $new_mode == M_INS) {
        $last->{char} = 'i';
    # Make sure prompt is cleared when leaving ex mode.
    } elsif ($mode == M_EX and $new_mode != M_EX) {
        _set_prompt('');
    }

    $mode = $new_mode;
    if ($mode == M_INS) {
        $history_index = undef;
        $register = '"';
        @insert_buf = ();
    # Reset every command mode related status as a fallback in case something
    # goes wrong.
    } elsif ($mode == M_CMD) {
        $numeric_prefix = undef;
        $operator = undef;
        $movement = undef;
        $register = '"';
    }

    Irssi::statusbar_items_redraw("vim_mode");
}

sub _set_prompt {
    my $msg = shift;
    # add a leading space unless we're trying to clear it entirely.
    $msg = ' ' . $msg if length $msg;
    Irssi::signal_emit('change prompt', $msg);
}

sub _warn {
    my ($warning) = @_;

    print '%_vim_mode: ', $warning, '%_';
}

# TODO:
# 10gg -> go to window 10 (prefix.gg -> win <prefix>)