File: urxvt.pm

package info (click to toggle)
rxvt-unicode 9.22-1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 6,476 kB
  • ctags: 5,351
  • sloc: ansic: 44,050; cpp: 18,621; sh: 3,235; perl: 2,972; makefile: 584
file content (2281 lines) | stat: -rw-r--r-- 64,288 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
=encoding utf8

=head1 NAME

urxvtperl - rxvt-unicode's embedded perl interpreter

=head1 SYNOPSIS

   # create a file grab_test in $HOME:

   sub on_sel_grab {
      warn "you selected ", $_[0]->selection;
      ()
   }

   # start a urxvt using it:

   urxvt --perl-lib $HOME -pe grab_test

=head1 DESCRIPTION

Every time a terminal object gets created, extension scripts specified via
the C<perl> resource are loaded and associated with it.

Scripts are compiled in a 'use strict "vars"' and 'use utf8' environment, and
thus must be encoded as UTF-8.

Each script will only ever be loaded once, even in urxvtd, where
scripts will be shared (but not enabled) for all terminals.

You can disable the embedded perl interpreter by setting both "perl-ext"
and "perl-ext-common" resources to the empty string.

=head1 PREPACKAGED EXTENSIONS

A number of extensions are delivered with this release. You can find them
in F<< <libdir>/urxvt/perl/ >>, and the documentation can be viewed using
F<< man urxvt-<EXTENSIONNAME> >>.

You can activate them like this:

  urxvt -pe <extensionname>

Or by adding them to the resource for extensions loaded by default:

  URxvt.perl-ext-common: default,selection-autotransform

Extensions may add additional resources and C<actions>, i.e., methods
which can be bound to a key and invoked by the user. An extension can
define the resources it support using so called META comments,
described below. Similarly to builtin resources, extension resources
can also be specified on the command line as long options (with C<.>
replaced by C<->), in which case the corresponding extension is loaded
automatically. For this to work the extension B<must> define META
comments for its resources.

=head1 API DOCUMENTATION

=head2 General API Considerations

All objects (such as terminals, time watchers etc.) are typical
reference-to-hash objects. The hash can be used to store anything you
like. All members starting with an underscore (such as C<_ptr> or
C<_hook>) are reserved for internal uses and B<MUST NOT> be accessed or
modified).

When objects are destroyed on the C++ side, the perl object hashes are
emptied, so its best to store related objects such as time watchers and
the like inside the terminal object so they get destroyed as soon as the
terminal is destroyed.

Argument names also often indicate the type of a parameter. Here are some
hints on what they mean:

=over 4

=item $text

Rxvt-unicode's special way of encoding text, where one "unicode" character
always represents one screen cell. See L<ROW_t> for a discussion of this format.

=item $string

A perl text string, with an emphasis on I<text>. It can store all unicode
characters and is to be distinguished with text encoded in a specific
encoding (often locale-specific) and binary data.

=item $octets

Either binary data or - more common - a text string encoded in a
locale-specific way.

=item $keysym

an integer that is a valid X11 keysym code. You can convert a string
into a keysym and viceversa by using C<XStringToKeysym> and
C<XKeysymToString>.

=back

=head2 Extension Objects

Every perl extension is a perl class. A separate perl object is created
for each terminal, and each terminal has its own set of extension objects,
which are passed as the first parameter to hooks. So extensions can use
their C<$self> object without having to think about clashes with other
extensions or other terminals, with the exception of methods and members
that begin with an underscore character C<_>: these are reserved for
internal use.

Although it isn't a C<urxvt::term> object, you can call all methods of the
C<urxvt::term> class on this object.

Additional methods only supported for extension objects are described in
the C<urxvt::extension> section below.

=head2 META comments

Rxvt-unicode recognizes special meta comments in extensions that define
different types of metadata.

Currently, it recognises only one such comment:

=over 4

=item #:META:RESOURCE:name:type:desc

The RESOURCE comment defines a resource used by the extension, where
C<name> is the resource name, C<type> is the resource type, C<boolean>
or C<string>, and C<desc> is the resource description.

=back

=head2 Hooks

The following subroutines can be declared in extension files, and will be
called whenever the relevant event happens.

The first argument passed to them is an extension object as described in
the in the C<Extension Objects> section.

B<All> of these hooks must return a boolean value. If any of the called
hooks returns true, then the event counts as being I<consumed>, and the
relevant action might not be carried out by the C++ code.

I<< When in doubt, return a false value (preferably C<()>). >>

=over 4

=item on_init $term

Called after a new terminal object has been initialized, but before
windows are created or the command gets run. Most methods are unsafe to
call or deliver senseless data, as terminal size and other characteristics
have not yet been determined. You can safely query and change resources
and options, though. For many purposes the C<on_start> hook is a better
place.

=item on_start $term

Called at the very end of initialisation of a new terminal, just before
trying to map (display) the toplevel and returning to the main loop.

=item on_destroy $term

Called whenever something tries to destroy terminal, when the terminal is
still fully functional (not for long, though).

=item on_reset $term

Called after the screen is "reset" for any reason, such as resizing or
control sequences. Here is where you can react on changes to size-related
variables.

=item on_child_start $term, $pid

Called just after the child process has been C<fork>ed.

=item on_child_exit $term, $status

Called just after the child process has exited. C<$status> is the status
from C<waitpid>.

=item on_sel_make $term, $eventtime

Called whenever a selection has been made by the user, but before the
selection text is copied, so changes to the beginning, end or type of the
selection will be honored.

Returning a true value aborts selection making by urxvt, in which case you
have to make a selection yourself by calling C<< $term->selection_grab >>.

=item on_sel_grab $term, $eventtime

Called whenever a selection has been copied, but before the selection is
requested from the server.  The selection text can be queried and changed
by calling C<< $term->selection >>.

Returning a true value aborts selection grabbing. It will still be highlighted.

=item on_sel_extend $term

Called whenever the user tries to extend the selection (e.g. with a double
click) and is either supposed to return false (normal operation), or
should extend the selection itself and return true to suppress the built-in
processing. This can happen multiple times, as long as the callback
returns true, it will be called on every further click by the user and is
supposed to enlarge the selection more and more, if possible.

See the F<selection> example extension.

=item on_view_change $term, $offset

Called whenever the view offset changes, i.e. the user or program
scrolls. Offset C<0> means display the normal terminal, positive values
show this many lines of scrollback.

=item on_scroll_back $term, $lines, $saved

Called whenever lines scroll out of the terminal area into the scrollback
buffer. C<$lines> is the number of lines scrolled out and may be larger
than the scroll back buffer or the terminal.

It is called before lines are scrolled out (so rows 0 .. min ($lines - 1,
$nrow - 1) represent the lines to be scrolled out). C<$saved> is the total
number of lines that will be in the scrollback buffer.

=item on_osc_seq $term, $op, $args, $resp

Called on every OSC sequence and can be used to suppress it or modify its
behaviour. The default should be to return an empty list. A true value
suppresses execution of the request completely. Make sure you don't get
confused by recursive invocations when you output an OSC sequence within
this callback.

C<on_osc_seq_perl> should be used for new behaviour.

=item on_osc_seq_perl $term, $args, $resp

Called whenever the B<ESC ] 777 ; string ST> command sequence (OSC =
operating system command) is processed. Cursor position and other state
information is up-to-date when this happens. For interoperability, the
string should start with the extension name (sans -osc) and a semicolon,
to distinguish it from commands for other extensions, and this might be
enforced in the future.

For example, C<overlay-osc> uses this:

   sub on_osc_seq_perl {
      my ($self, $osc, $resp) = @_;

      return unless $osc =~ s/^overlay;//;

      ... process remaining $osc string
   }

Be careful not ever to trust (in a security sense) the data you receive,
as its source can not easily be controlled (e-mail content, messages from
other users on the same system etc.).

For responses, C<$resp> contains the end-of-args separator used by the
sender.

=item on_add_lines $term, $string

Called whenever text is about to be output, with the text as argument. You
can filter/change and output the text yourself by returning a true value
and calling C<< $term->scr_add_lines >> yourself. Please note that this
might be very slow, however, as your hook is called for B<all> text being
output.

=item on_tt_write $term, $octets

Called whenever some data is written to the tty/pty and can be used to
suppress or filter tty input.

=item on_tt_paste $term, $octets

Called whenever text is about to be pasted, with the text as argument. You
can filter/change and paste the text yourself by returning a true value
and calling C<< $term->tt_paste >> yourself. C<$octets> is
locale-encoded.

=item on_line_update $term, $row

Called whenever a line was updated or changed. Can be used to filter
screen output (e.g. underline urls or other useless stuff). Only lines
that are being shown will be filtered, and, due to performance reasons,
not always immediately.

The row number is always the topmost row of the line if the line spans
multiple rows.

Please note that, if you change the line, then the hook might get called
later with the already-modified line (e.g. if unrelated parts change), so
you cannot just toggle rendition bits, but only set them.

=item on_refresh_begin $term

Called just before the screen gets redrawn. Can be used for overlay or
similar effects by modifying the terminal contents in refresh_begin, and
restoring them in refresh_end. The built-in overlay and selection display
code is run after this hook, and takes precedence.

=item on_refresh_end $term

Called just after the screen gets redrawn. See C<on_refresh_begin>.

=item on_action $term, $string

Called whenever an action is invoked for the corresponding extension
(e.g. via a C<extension:string> builtin action bound to a key, see
description of the B<keysym> resource in the urxvt(1) manpage). The
event is simply the action string. Note that an action event is always
associated to a single extension.

=item on_user_command $term, $string *DEPRECATED*

Called whenever a user-configured event is being activated (e.g. via
a C<perl:string> action bound to a key, see description of the B<keysym>
resource in the urxvt(1) manpage).

The event is simply the action string. This interface is going away in
preference to the C<on_action> hook.

=item on_resize_all_windows $term, $new_width, $new_height

Called just after the new window size has been calculated, but before
windows are actually being resized or hints are being set. If this hook
returns a true value, setting of the window hints is being skipped.

=item on_x_event $term, $event

Called on every X event received on the vt window (and possibly other
windows). Should only be used as a last resort. Most event structure
members are not passed.

=item on_root_event $term, $event

Like C<on_x_event>, but is called for events on the root window.

=item on_focus_in $term

Called whenever the window gets the keyboard focus, before rxvt-unicode
does focus in processing.

=item on_focus_out $term

Called whenever the window loses keyboard focus, before rxvt-unicode does
focus out processing.

=item on_configure_notify $term, $event

=item on_property_notify $term, $event

=item on_key_press $term, $event, $keysym, $octets

=item on_key_release $term, $event, $keysym

=item on_button_press $term, $event

=item on_button_release $term, $event

=item on_motion_notify $term, $event

=item on_map_notify $term, $event

=item on_unmap_notify $term, $event

Called whenever the corresponding X event is received for the terminal. If
the hook returns true, then the event will be ignored by rxvt-unicode.

The event is a hash with most values as named by Xlib (see the XEvent
manpage), with the additional members C<row> and C<col>, which are the
(real, not screen-based) row and column under the mouse cursor.

C<on_key_press> additionally receives the string rxvt-unicode would
output, if any, in locale-specific encoding.

=item on_client_message $term, $event

=item on_wm_protocols $term, $event

=item on_wm_delete_window $term, $event

Called when various types of ClientMessage events are received (all with
format=32, WM_PROTOCOLS or WM_PROTOCOLS:WM_DELETE_WINDOW).

=item on_bell $term

Called on receipt of a bell character.

=back

=cut

package urxvt;

use utf8;
use strict 'vars';
use Carp ();
use Scalar::Util ();
use List::Util ();

our $VERSION = 1;
our $TERM;
our @TERM_INIT; # should go, prevents async I/O etc.
our @TERM_EXT;  # should go, prevents async I/O etc.
our @HOOKNAME;
our %HOOKTYPE = map +($HOOKNAME[$_] => $_), 0..$#HOOKNAME;
our %OPTION;

our $LIBDIR;
our $RESNAME;
our $RESCLASS;
our $RXVTNAME;

our $NOCHAR = chr 0xffff;

=head2 Variables in the C<urxvt> Package

=over 4

=item $urxvt::LIBDIR

The rxvt-unicode library directory, where, among other things, the perl
modules and scripts are stored.

=item $urxvt::RESCLASS, $urxvt::RESCLASS

The resource class and name rxvt-unicode uses to look up X resources.

=item $urxvt::RXVTNAME

The basename of the installed binaries, usually C<urxvt>.

=item $urxvt::TERM

The current terminal. This variable stores the current C<urxvt::term>
object, whenever a callback/hook is executing.

=item @urxvt::TERM_INIT

All code references in this array will be called as methods of the next newly
created C<urxvt::term> object (during the C<on_init> phase). The array
gets cleared before the code references that were in it are being executed,
so references can push themselves onto it again if they so desire.

This complements to the perl-eval command line option, but gets executed
first.

=item @urxvt::TERM_EXT

Works similar to C<@TERM_INIT>, but contains perl package/class names, which
get registered as normal extensions after calling the hooks in C<@TERM_INIT>
but before other extensions. Gets cleared just like C<@TERM_INIT>.

=back

=head2 Functions in the C<urxvt> Package

=over 4

=item urxvt::fatal $errormessage

Fatally aborts execution with the given error message (which should
include a trailing newline). Avoid at all costs! The only time this
is acceptable (and useful) is in the init hook, where it prevents the
terminal from starting up.

=item urxvt::warn $string

Calls C<rxvt_warn> with the given string which should include a trailing
newline. The module also overwrites the C<warn> builtin with a function
that calls this function.

Using this function has the advantage that its output ends up in the
correct place, e.g. on stderr of the connecting urxvtc client.

Messages have a size limit of 1023 bytes currently.

=item @terms = urxvt::termlist

Returns all urxvt::term objects that exist in this process, regardless of
whether they are started, being destroyed etc., so be careful. Only term
objects that have perl extensions attached will be returned (because there
is no urxvt::term object associated with others).

=item $time = urxvt::NOW

Returns the "current time" (as per the event loop).

=item urxvt::CurrentTime

=item urxvt::ShiftMask, LockMask, ControlMask, Mod1Mask, Mod2Mask,
Mod3Mask, Mod4Mask, Mod5Mask, Button1Mask, Button2Mask, Button3Mask,
Button4Mask, Button5Mask, AnyModifier

=item urxvt::NoEventMask, KeyPressMask, KeyReleaseMask,
ButtonPressMask, ButtonReleaseMask, EnterWindowMask, LeaveWindowMask,
PointerMotionMask, PointerMotionHintMask, Button1MotionMask, Button2MotionMask,
Button3MotionMask, Button4MotionMask, Button5MotionMask, ButtonMotionMask,
KeymapStateMask, ExposureMask, VisibilityChangeMask, StructureNotifyMask,
ResizeRedirectMask, SubstructureNotifyMask, SubstructureRedirectMask,
FocusChangeMask, PropertyChangeMask, ColormapChangeMask, OwnerGrabButtonMask

=item urxvt::KeyPress, KeyRelease, ButtonPress, ButtonRelease, MotionNotify,
EnterNotify, LeaveNotify, FocusIn, FocusOut, KeymapNotify, Expose,
GraphicsExpose, NoExpose, VisibilityNotify, CreateNotify, DestroyNotify,
UnmapNotify, MapNotify, MapRequest, ReparentNotify, ConfigureNotify,
ConfigureRequest, GravityNotify, ResizeRequest, CirculateNotify,
CirculateRequest, PropertyNotify, SelectionClear, SelectionRequest,
SelectionNotify, ColormapNotify, ClientMessage, MappingNotify

Various constants for use in X calls and event processing.

=back

=head2 RENDITION

Rendition bitsets contain information about colour, font, font styles and
similar information for each screen cell.

The following "macros" deal with changes in rendition sets. You should
never just create a bitset, you should always modify an existing one,
as they contain important information required for correct operation of
rxvt-unicode.

=over 4

=item $rend = urxvt::DEFAULT_RSTYLE

Returns the default rendition, as used when the terminal is starting up or
being reset. Useful as a base to start when creating renditions.

=item $rend = urxvt::OVERLAY_RSTYLE

Return the rendition mask used for overlays by default.

=item $rendbit = urxvt::RS_Bold, urxvt::RS_Italic, urxvt::RS_Blink,
urxvt::RS_RVid, urxvt::RS_Uline

Return the bit that enabled bold, italic, blink, reverse-video and
underline, respectively. To enable such a style, just logically OR it into
the bitset.

=item $foreground = urxvt::GET_BASEFG $rend

=item $background = urxvt::GET_BASEBG $rend

Return the foreground/background colour index, respectively.

=item $rend = urxvt::SET_FGCOLOR $rend, $new_colour

=item $rend = urxvt::SET_BGCOLOR $rend, $new_colour

=item $rend = urxvt::SET_COLOR $rend, $new_fg, $new_bg

Replace the foreground/background colour in the rendition mask with the
specified one.

=item $value = urxvt::GET_CUSTOM $rend

Return the "custom" value: Every rendition has 5 bits for use by
extensions. They can be set and changed as you like and are initially
zero.

=item $rend = urxvt::SET_CUSTOM $rend, $new_value

Change the custom value.

=back

=cut

BEGIN {
   # overwrite perl's warn
   *CORE::GLOBAL::warn = sub {
      my $msg = join "", @_;
      $msg .= "\n"
         unless $msg =~ /\n$/;
      urxvt::warn ($msg);
   };
}

no warnings 'utf8';

sub parse_resource {
   my ($term, $name, $isarg, $longopt, $flag, $value) = @_;

   $term->scan_extensions;

   my $r = $term->{meta}{resource};
   keys %$r; # reset iterator
   while (my ($k, $v) = each %$r) {
      my $pattern = $k;
      $pattern =~ y/./-/ if $isarg;
      my $prefix = $name;
      my $suffix;
      if ($pattern =~ /\-$/) {
         $prefix = substr $name, 0, length $pattern;
         $suffix = substr $name, length $pattern;
      }
      if ($pattern eq $prefix) {
         $name = "$urxvt::RESCLASS.$k$suffix";

         push @{ $term->{perl_ext_3} }, $v->[0];

         if ($v->[1] eq "boolean") {
            $term->put_option_db ($name, $flag ? "true" : "false");
            return 1;
         } else {
            $term->put_option_db ($name, $value);
            return 1 + 2;
         }
      }
   }

   0
}

sub usage {
   my ($term, $usage_type) = @_;

   $term->scan_extensions;

   my $r = $term->{meta}{resource};

   for my $pattern (sort keys %$r) {
      my ($ext, $type, $desc) = @{ $r->{$pattern} };

      $desc .= " (-pe $ext)";

      if ($usage_type == 1) {
         $pattern =~ y/./-/;
         $pattern =~ s/-$/-.../g;

         if ($type eq "boolean") {
            urxvt::log sprintf "  -%-30s %s\n", "/+$pattern", $desc;
         } else {
            urxvt::log sprintf "  -%-30s %s\n", "$pattern $type", $desc;
         }
      } else {
         $pattern =~ s/\.$/.*/g;
         urxvt::log sprintf "  %-31s %s\n", "$pattern:", $type;
      }
   }
}

my $verbosity = $ENV{URXVT_PERL_VERBOSITY};

sub verbose {
   my ($level, $msg) = @_;
   warn "$msg\n" if $level <= $verbosity;
}

my %extension_pkg;

# load a single script into its own package, once only
sub extension_package($) {
   my ($path) = @_;

   $extension_pkg{$path} ||= do {
      $path =~ /([^\/\\]+)$/;
      my $pkg = $1;
      $pkg =~ s/[^[:word:]]/_/g;
      $pkg = "urxvt::ext::$pkg";

      verbose 3, "loading extension '$path' into package '$pkg'";

      (${"$pkg\::_NAME"} = $path) =~ s/^.*[\\\/]//; # hackish

      open my $fh, "<:raw", $path
         or die "$path: $!";

      my $source =
         "package $pkg; use strict 'vars'; use utf8; no warnings 'utf8';\n"
         . "#line 1 \"$path\"\n{\n"
         . (do { local $/; <$fh> })
         . "\n};\n1";

      eval $source
         or die "$path: $@";

      $pkg
   }
}

our $retval; # return value for urxvt

# called by the rxvt core
sub invoke {
   local $TERM = shift;
   my $htype = shift;

   if ($htype == HOOK_INIT) {
      my @dirs = $TERM->perl_libdirs;

      $TERM->scan_extensions;

      my %ext_arg;

      {
         my @init = @TERM_INIT;
         @TERM_INIT = ();
         $_->($TERM) for @init;
         my @pkg = @TERM_EXT;
         @TERM_EXT = ();
         $TERM->register_package ($_) for @pkg;
      }

      for (
         (grep $_, map { split /,/, $TERM->resource ("perl_ext_$_") } 1, 2),
         @{ delete $TERM->{perl_ext_3} }
      ) {
         if ($_ eq "default") {

            $ext_arg{$_} = []
               for qw(selection option-popup selection-popup readline searchable-scrollback);

            for ($TERM->_keysym_resources) {
               next if /^(?:string|command|builtin|builtin-string|perl)/;
               next unless /^([A-Za-z0-9_\-]+):/;

               my $ext = $1;

               $ext_arg{$ext} = [];
            }

         } elsif (/^-(.*)$/) {
            delete $ext_arg{$1};

         } elsif (/^([^<]+)<(.*)>$/) {
            push @{ $ext_arg{$1} }, $2;

         } else {
            $ext_arg{$_} ||= [];
         }
      }

      for my $ext (sort keys %ext_arg) {
         my @files = grep -f $_, map "$_/$ext", @dirs;

         if (@files) {
            $TERM->register_package (extension_package $files[0], $ext_arg{$ext});
         } else {
            warn "perl extension '$ext' not found in perl library search path\n";
         }
      }

      eval "#line 1 \"--perl-eval resource/argument\"\n" . $TERM->resource ("perl_eval");
      warn $@ if $@;
   }

   $retval = undef;

   if (my $cb = $TERM->{_hook}[$htype]) {
      verbose 10, "$HOOKNAME[$htype] (" . (join ", ", $TERM, @_) . ")"
         if $verbosity >= 10;

      if ($htype == HOOK_ACTION) {
         # this hook is only sent to the extension with the name
         # matching the first arg
         my $pkg = shift;
         $pkg =~ y/-/_/;
         $pkg = "urxvt::ext::$pkg";

         $cb = $cb->{$pkg}
            or return undef; #TODO: maybe warn user?

         $cb = { $pkg => $cb };
      }

      for my $pkg (keys %$cb) {
         my $retval_ = eval { $cb->{$pkg}->($TERM->{_pkg}{$pkg} || $TERM, @_) };
         $retval ||= $retval_;

         if ($@) {
            $TERM->ungrab; # better to lose the grab than the session
            warn $@;
         }
      }

      verbose 11, "$HOOKNAME[$htype] returning <$retval>"
         if $verbosity >= 11;
   }

   if ($htype == HOOK_DESTROY) {
      # clear package objects
      %$_ = () for values %{ $TERM->{_pkg} };

      # clear package
      %$TERM = ();
   }

   $retval
}

sub SET_COLOR($$$) {
   SET_BGCOLOR (SET_FGCOLOR ($_[0], $_[1]), $_[2])
}

sub rend2mask {
   no strict 'refs';
   my ($str, $mask) = (@_, 0);
   my %color = ( fg => undef, bg => undef );
   my @failed;
   for my $spec ( split /\s+/, $str ) {
      if ( $spec =~ /^([fb]g)[_:-]?(\d+)/i ) {
         $color{lc($1)} = $2;
      } else {
         my $neg = $spec =~ s/^[-^]//;
         unless ( exists &{"RS_$spec"} ) {
            push @failed, $spec;
            next;
         }
         my $cur = &{"RS_$spec"};
         if ( $neg ) {
            $mask &= ~$cur;
         } else {
            $mask |= $cur;
         }
      }
   }
   ($mask, @color{qw(fg bg)}, \@failed)
}

package urxvt::term::extension;

=head2 The C<urxvt::term::extension> class

Each extension attached to a terminal object is represented by
a C<urxvt::term::extension> object.

You can use these objects, which are passed to all callbacks to store any
state related to the terminal and extension instance.

The methods (And data members) documented below can be called on extension
objects, in addition to call methods documented for the <urxvt::term>
class.

=over 4

=item $urxvt_term = $self->{term}

Returns the C<urxvt::term> object associated with this instance of the
extension. This member I<must not> be changed in any way.

=cut

our $AUTOLOAD;

sub AUTOLOAD {
   $AUTOLOAD =~ /:([^:]+)$/
      or die "FATAL: \$AUTOLOAD '$AUTOLOAD' unparsable";

   eval qq{
      sub $AUTOLOAD {
         my \$proxy = shift;
         \$proxy->{term}->$1 (\@_)
      }
      1
   } or die "FATAL: unable to compile method forwarder: $@";

   goto &$AUTOLOAD;
}

sub DESTROY {
   # nop
}

# urxvt::destroy_hook (basically a cheap Guard:: implementation)

sub urxvt::destroy_hook::DESTROY {
   ${$_[0]}->();
}

sub urxvt::destroy_hook(&) {
   bless \shift, urxvt::destroy_hook::
}

=item $self->enable ($hook_name => $cb[, $hook_name => $cb..])

Dynamically enable the given hooks (named without the C<on_> prefix) for
this extension, replacing any hook previously installed via C<enable> in
this extension.

This is useful when you want to overwrite time-critical hooks only
temporarily.

To install additional callbacks for the same hook, you can use the C<on>
method of the C<urxvt::term> class.

=item $self->disable ($hook_name[, $hook_name..])

Dynamically disable the given hooks.

=cut

sub enable {
   my ($self, %hook) = @_;
   my $pkg = $self->{_pkg};

   while (my ($name, $cb) = each %hook) {
      my $htype = $HOOKTYPE{uc $name};
      defined $htype
         or Carp::croak "unsupported hook type '$name'";

      $self->set_should_invoke ($htype, +1)
         unless exists $self->{term}{_hook}[$htype]{$pkg};

      $self->{term}{_hook}[$htype]{$pkg} = $cb;
   }
}

sub disable {
   my ($self, @hook) = @_;
   my $pkg = $self->{_pkg};

   for my $name (@hook) {
      my $htype = $HOOKTYPE{uc $name};
      defined $htype
         or Carp::croak "unsupported hook type '$name'";

      $self->set_should_invoke ($htype, -1)
         if delete $self->{term}{_hook}[$htype]{$pkg};
   }
}

=item $guard = $self->on ($hook_name => $cb[, $hook_name => $cb..])

Similar to the C<enable> enable, but installs additional callbacks for
the given hook(s) (that is, it doesn't replace existing callbacks), and
returns a guard object. When the guard object is destroyed the callbacks
are disabled again.

=cut

sub urxvt::extension::on_disable::DESTROY {
   my $disable = shift;

   my $term = delete $disable->{""};

   while (my ($htype, $id) = each %$disable) {
      delete $term->{_hook}[$htype]{$id};
      $term->set_should_invoke ($htype, -1);
   }
}

sub on {
   my ($self, %hook) = @_;

   my $term = $self->{term};

   my %disable = ( "" => $term );

   while (my ($name, $cb) = each %hook) {
      my $htype = $HOOKTYPE{uc $name};
      defined $htype
         or Carp::croak "unsupported hook type '$name'";

      $term->set_should_invoke ($htype, +1);
      $term->{_hook}[$htype]{ $disable{$htype} = $cb+0 }
         = sub { shift; $cb->($self, @_) }; # very ugly indeed
   }

   bless \%disable, "urxvt::extension::on_disable"
}

=item $self->bind_action ($hotkey, $action)

=item $self->x_resource ($pattern)

=item $self->x_resource_boolean ($pattern)

These methods support an additional C<%> prefix for C<$action> or
C<$pattern> when called on an extension object, compared to the
C<urxvt::term> methods of the same name - see the description of these
methods in the C<urxvt::term> class for details.

=cut

sub bind_action {
   my ($self, $hotkey, $action) = @_;
   $action =~ s/^%:/$_[0]{_name}:/;
   $self->{term}->bind_action ($hotkey, $action)
}

sub x_resource {
   my ($self, $name) = @_;
   $name =~ s/^%(\.|$)/$_[0]{_name}$1/;
   $self->{term}->x_resource ($name)
}

sub x_resource_boolean {
   my ($self, $name) = @_;
   $name =~ s/^%(\.|$)/$_[0]{_name}$1/;
   $self->{term}->x_resource_boolean ($name)
}

=back

=cut

package urxvt::anyevent;

=head2 The C<urxvt::anyevent> Class

The sole purpose of this class is to deliver an interface to the
C<AnyEvent> module - any module using it will work inside urxvt without
further programming. The only exception is that you cannot wait on
condition variables, but non-blocking condvar use is ok.

In practical terms this means is that you cannot use blocking APIs, but
the non-blocking variant should work.

=cut

our $VERSION = '5.23';

$INC{"urxvt/anyevent.pm"} = 1; # mark us as there
push @AnyEvent::REGISTRY, [urxvt => urxvt::anyevent::];

sub timer {
   my ($class, %arg) = @_;

   my $cb = $arg{cb};

   urxvt::timer
      ->new
      ->after ($arg{after}, $arg{interval})
      ->cb ($arg{interval} ? $cb : sub {
        $_[0]->stop; # need to cancel manually
        $cb->();
      })
}

sub io {
   my ($class, %arg) = @_;

   my $cb = $arg{cb};
   my $fd = fileno $arg{fh};
   defined $fd or $fd = $arg{fh};

   bless [$arg{fh}, urxvt::iow
             ->new
             ->fd ($fd)
             ->events (($arg{poll} =~ /r/ ? 1 : 0)
                     | ($arg{poll} =~ /w/ ? 2 : 0))
             ->start
             ->cb ($cb)
         ], urxvt::anyevent::
}

sub idle {
   my ($class, %arg) = @_;

   my $cb = $arg{cb};

   urxvt::iw
      ->new
      ->start
      ->cb ($cb)
}

sub child {
   my ($class, %arg) = @_;

   my $cb = $arg{cb};

   urxvt::pw
      ->new
      ->start ($arg{pid})
      ->cb (sub {
        $_[0]->stop; # need to cancel manually
        $cb->($_[0]->rpid, $_[0]->rstatus);
      })
}

sub DESTROY {
   $_[0][1]->stop;
}

# only needed for AnyEvent < 6 compatibility
sub one_event {
   Carp::croak "AnyEvent->one_event blocking wait unsupported in urxvt, use a non-blocking API";
}

package urxvt::term;

=head2 The C<urxvt::term> Class

=over 4

=cut

# find on_xxx subs in the package and register them
# as hooks
sub register_package {
   my ($self, $pkg, $argv) = @_;

   no strict 'refs';

   urxvt::verbose 6, "register package $pkg to $self";

   @{"$pkg\::ISA"} = urxvt::term::extension::;

   my $proxy = bless {
      _pkg  => $pkg,
      _name => ${"$pkg\::_NAME"}, # hackish
      argv  => $argv,
   }, $pkg;
   Scalar::Util::weaken ($proxy->{term} = $self);

   $self->{_pkg}{$pkg} = $proxy;

   for my $name (@HOOKNAME) {
      if (my $ref = $pkg->can ("on_" . lc $name)) {
         $proxy->enable ($name => $ref);
      }
   }
}

sub perl_libdirs {
   map { split /:/ }
      $_[0]->resource ("perl_lib"),
      $ENV{URXVT_PERL_LIB},
      "$ENV{HOME}/.urxvt/ext",
      "$LIBDIR/perl"
}

# scan for available extensions and collect their metadata
sub scan_extensions {
   my ($self) = @_;

   return if exists $self->{meta};

   my @urxvtdirs = perl_libdirs $self;
#   my @cpandirs = grep -d, map "$_/URxvt/Ext", @INC;

   $self->{meta} = \my %meta;

   # first gather extensions

   my $gather = sub {
      my ($dir, $core) = @_;

      opendir my $fh, $dir
         or return;

      for my $ext (readdir $fh) {
         $ext !~ /^\./
            or next;

         open my $fh, "<", "$dir/$ext"
            or next;

         -f $fh
            or next;

         $ext =~ s/\.uext$// or $core
            or next;

         my %ext = (dir => $dir);

         while (<$fh>) {
            if (/^#:META:(?:X_)?RESOURCE:(.*)/) {
               my ($pattern, $type, $desc) = split /:/, $1;
               $pattern =~ s/^%(\.|$)/$ext$1/g; # % in pattern == extension name
               if ($pattern =~ /[^a-zA-Z0-9\-\.]/) {
                  warn "$dir/$ext: meta resource '$pattern' contains illegal characters (not alphanumeric nor . nor *)\n";
               } else {
                  $ext{resource}{$pattern} = [$ext, $type, $desc];
               }
            } elsif (/^\s*(?:#|$)/) {
               # skip other comments and empty lines
            } else {
               last; # stop parsing on first non-empty non-comment line
            }
         }

         $meta{ext}{$ext} = \%ext;
      }
   };

#   $gather->($_, 0) for @cpandirs;
   $gather->($_, 1) for @urxvtdirs;

   # and now merge resources

   $meta{resource} = \my %resource;

   while (my ($k, $v) = each %{ $meta{ext} }) {
      #TODO: should check for extensions overriding each other
      %resource = (%resource, %{ $v->{resource} });
   }
}

=item $term = new urxvt::term $envhashref, $rxvtname, [arg...]

Creates a new terminal, very similar as if you had started it with system
C<$rxvtname, arg...>. C<$envhashref> must be a reference to a C<%ENV>-like
hash which defines the environment of the new terminal.

Croaks (and probably outputs an error message) if the new instance
couldn't be created.  Returns C<undef> if the new instance didn't
initialise perl, and the terminal object otherwise. The C<init> and
C<start> hooks will be called before this call returns, and are free to
refer to global data (which is race free).

=cut

sub new {
   my ($class, $env, @args) = @_;

   $env  or Carp::croak "environment hash missing in call to urxvt::term->new";
   @args or Carp::croak "name argument missing in call to urxvt::term->new";

   _new ([ map "$_=$env->{$_}", keys %$env ], \@args);
}

=item $term->destroy

Destroy the terminal object (close the window, free resources
etc.). Please note that urxvt will not exit as long as any event
watchers (timers, io watchers) are still active.

=item $term->exec_async ($cmd[, @args])

Works like the combination of the C<fork>/C<exec> builtins, which executes
("starts") programs in the background. This function takes care of setting
the user environment before exec'ing the command (e.g. C<PATH>) and should
be preferred over explicit calls to C<exec> or C<system>.

Returns the pid of the subprocess or C<undef> on error.

=cut

sub exec_async {
   my $self = shift;

   my $pid = fork;

   return $pid
      if !defined $pid or $pid;

   %ENV = %{ $self->env };

   exec @_;
   urxvt::_exit 255;
}

=item $isset = $term->option ($optval[, $set])

Returns true if the option specified by C<$optval> is enabled, and
optionally change it. All option values are stored by name in the hash
C<%urxvt::OPTION>. Options not enabled in this binary are not in the hash.

Here is a likely non-exhaustive list of option names, please see the
source file F</src/optinc.h> to see the actual list:

 borderLess buffered console cursorBlink cursorUnderline hold iconic
 insecure intensityStyles iso14755 iso14755_52 jumpScroll loginShell
 mapAlert meta8 mouseWheelScrollPage override_redirect pastableTabs
 pointerBlank reverseVideo scrollBar scrollBar_floating scrollBar_right
 scrollTtyKeypress scrollTtyOutput scrollWithBuffer secondaryScreen
 secondaryScroll skipBuiltinGlyphs skipScroll transparent tripleclickwords
 urgentOnBell utmpInhibit visualBell

=item $value = $term->resource ($name[, $newval])

Returns the current resource value associated with a given name and
optionally sets a new value. Setting values is most useful in the C<init>
hook. Unset resources are returned and accepted as C<undef>.

The new value must be properly encoded to a suitable character encoding
before passing it to this method. Similarly, the returned value may need
to be converted from the used encoding to text.

Resource names are as defined in F<src/rsinc.h>. Colours can be specified
as resource names of the form C<< color+<index> >>, e.g. C<color+5>. (will
likely change).

Please note that resource strings will currently only be freed when the
terminal is destroyed, so changing options frequently will eat memory.

Here is a likely non-exhaustive list of resource names, not all of which
are supported in every build, please see the source file F</src/rsinc.h>
to see the actual list:

  answerbackstring backgroundPixmap backspace_key blurradius
  boldFont boldItalicFont borderLess buffered chdir color cursorBlink
  cursorUnderline cutchars delete_key depth display_name embed ext_bwidth
  fade font geometry hold iconName iconfile imFont imLocale inputMethod
  insecure int_bwidth intensityStyles iso14755 iso14755_52 italicFont
  jumpScroll letterSpace lineSpace loginShell mapAlert meta8 modifier
  mouseWheelScrollPage name override_redirect pastableTabs path perl_eval
  perl_ext_1 perl_ext_2 perl_lib pointerBlank pointerBlankDelay
  preeditType print_pipe pty_fd reverseVideo saveLines scrollBar
  scrollBar_align scrollBar_floating scrollBar_right scrollBar_thickness
  scrollTtyKeypress scrollTtyOutput scrollWithBuffer scrollstyle
  secondaryScreen secondaryScroll shade skipBuiltinGlyphs skipScroll
  term_name title transient_for transparent tripleclickwords urgentOnBell
  utmpInhibit visualBell

=cut

sub resource($$;$) {
   my ($self, $name) = (shift, shift);
   unshift @_, $self, $name, ($name =~ s/\s*\+\s*(\d+)$// ? $1 : 0);
   goto &urxvt::term::_resource
}

=item $value = $term->x_resource ($pattern)

Returns the X-Resource for the given pattern, excluding the program or
class name, i.e.  C<< $term->x_resource ("boldFont") >> should return the
same value as used by this instance of rxvt-unicode. Returns C<undef> if no
resource with that pattern exists.

Extensions that define extra resources also need to call this method
to access their values.

If the method is called on an extension object (basically, from an
extension), then the special prefix C<%.> will be replaced by the name of
the extension and a dot, and the lone string C<%> will be replaced by the
extension name itself. This makes it possible to code extensions so you
can rename them and get a new set of resources without having to change
the actual code.

This method should only be called during the C<on_start> hook, as there is
only one resource database per display, and later invocations might return
the wrong resources.

=item $value = $term->x_resource_boolean ($pattern)

Like C<x_resource>, above, but interprets the string value as a boolean
and returns C<1> for true values, C<0> for false values and C<undef> if
the resource or option isn't specified.

You should always use this method to parse boolean resources.

=cut

sub x_resource_boolean {
   my $res = &x_resource;

   $res =~ /^\s*(?:true|yes|on|1)\s*$/i ? 1 : defined $res && 0
}

=item $action = $term->lookup_keysym ($keysym, $state)

Returns the action bound to key combination C<($keysym, $state)>,
if a binding for it exists, and C<undef> otherwise.

=item $success = $term->bind_action ($key, $action)

Adds a key binding exactly as specified via a C<keysym> resource. See the
C<keysym> resource in the urxvt(1) manpage.

To add default bindings for actions, an extension should call C<<
->bind_action >> in its C<init> hook for every such binding. Doing it
in the C<init> hook allows users to override or remove the binding
again.

Example: the C<searchable-scrollback> by default binds itself
on C<Meta-s>, using C<< $self->bind_action >>, which calls C<<
$term->bind_action >>.

   sub init {
      my ($self) = @_;

      $self->bind_action ("M-s" => "%:start");
   }

=item $rend = $term->rstyle ([$new_rstyle])

Return and optionally change the current rendition. Text that is output by
the terminal application will use this style.

=item ($row, $col) = $term->screen_cur ([$row, $col])

Return the current coordinates of the text cursor position and optionally
set it (which is usually bad as applications don't expect that).

=item ($row, $col) = $term->selection_mark ([$row, $col])

=item ($row, $col) = $term->selection_beg ([$row, $col])

=item ($row, $col) = $term->selection_end ([$row, $col])

Return the current values of the selection mark, begin or end positions.

When arguments are given, then the selection coordinates are set to
C<$row> and C<$col>, and the selection screen is set to the current
screen.

=item $screen = $term->selection_screen ([$screen])

Returns the current selection screen, and then optionally sets it.

=item $term->selection_make ($eventtime[, $rectangular])

Tries to make a selection as set by C<selection_beg> and
C<selection_end>. If C<$rectangular> is true (default: false), a
rectangular selection will be made. This is the preferred function to make
a selection.

=item $success = $term->selection_grab ($eventtime[, $clipboard])

Try to acquire ownership of the primary (clipboard if C<$clipboard> is
true) selection from the server. The corresponding text can be set
with the next method. No visual feedback will be given. This function
is mostly useful from within C<on_sel_grab> hooks.

=item $oldtext = $term->selection ([$newtext, $clipboard])

Return the current selection (clipboard if C<$clipboard> is true) text
and optionally replace it by C<$newtext>.

=item $term->selection_clear ([$clipboard])

Revoke ownership of the primary (clipboard if C<$clipboard> is true) selection.

=item $term->overlay_simple ($x, $y, $text)

Create a simple multi-line overlay box. See the next method for details.

=cut

sub overlay_simple {
   my ($self, $x, $y, $text) = @_;

   my @lines = split /\n/, $text;

   my $w = List::Util::max map $self->strwidth ($_), @lines;

   my $overlay = $self->overlay ($x, $y, $w, scalar @lines);
   $overlay->set (0, $_, $lines[$_]) for 0.. $#lines;

   $overlay
}

=item $term->overlay ($x, $y, $width, $height[, $rstyle[, $border]])

Create a new (empty) overlay at the given position with the given
width/height. C<$rstyle> defines the initial rendition style
(default: C<OVERLAY_RSTYLE>).

If C<$border> is C<2> (default), then a decorative border will be put
around the box.

If either C<$x> or C<$y> is negative, then this is counted from the
right/bottom side, respectively.

This method returns an urxvt::overlay object. The overlay will be visible
as long as the perl object is referenced.

The methods currently supported on C<urxvt::overlay> objects are:

=over 4

=item $overlay->set ($x, $y, $text[, $rend])

Similar to C<< $term->ROW_t >> and C<< $term->ROW_r >> in that it puts
text in rxvt-unicode's special encoding and an array of rendition values
at a specific position inside the overlay.

If C<$rend> is missing, then the rendition will not be changed.

=item $overlay->hide

If visible, hide the overlay, but do not destroy it.

=item $overlay->show

If hidden, display the overlay again.

=back

=item $popup = $term->popup ($event)

Creates a new C<urxvt::popup> object that implements a popup menu. The
C<$event> I<must> be the event causing the menu to pop up (a button event,
currently).

=cut

sub popup {
   my ($self, $event) = @_;

   $self->grab ($event->{time}, 1)
      or return;

   my $popup = bless {
      term  => $self,
      event => $event,
   }, urxvt::popup::;

   Scalar::Util::weaken $popup->{term};

   $self->{_destroy}{$popup} = urxvt::destroy_hook { $popup->{popup}->destroy };
   Scalar::Util::weaken $self->{_destroy}{$popup};

   $popup
}

=item $cellwidth = $term->strwidth ($string)

Returns the number of screen-cells this string would need. Correctly
accounts for wide and combining characters.

=item $octets = $term->locale_encode ($string)

Convert the given text string into the corresponding locale encoding.

=item $string = $term->locale_decode ($octets)

Convert the given locale-encoded octets into a perl string.

=item $term->scr_xor_span ($beg_row, $beg_col, $end_row, $end_col[, $rstyle])

XORs the rendition values in the given span with the provided value
(default: C<RS_RVid>), which I<MUST NOT> contain font styles. Useful in
refresh hooks to provide effects similar to the selection.

=item $term->scr_xor_rect ($beg_row, $beg_col, $end_row, $end_col[, $rstyle1[, $rstyle2]])

Similar to C<scr_xor_span>, but xors a rectangle instead. Trailing
whitespace will additionally be xored with the C<$rstyle2>, which defaults
to C<RS_RVid | RS_Uline>, which removes reverse video again and underlines
it instead. Both styles I<MUST NOT> contain font styles.

=item $term->scr_bell

Ring the bell!

=item $term->scr_add_lines ($string)

Write the given text string to the screen, as if output by the application
running inside the terminal. It may not contain command sequences (escape
codes - see C<cmd_parse> for that), but is free to use line feeds,
carriage returns and tabs. The string is a normal text string, not in
locale-dependent encoding.

Normally its not a good idea to use this function, as programs might be
confused by changes in cursor position or scrolling. Its useful inside a
C<on_add_lines> hook, though.

=item $term->scr_change_screen ($screen)

Switch to given screen - 0 primary, 1 secondary.

=item $term->cmd_parse ($octets)

Similar to C<scr_add_lines>, but the argument must be in the
locale-specific encoding of the terminal and can contain command sequences
(escape codes) that will be interpreted.

=item $term->tt_write ($octets)

Write the octets given in C<$octets> to the tty (i.e. as user input
to the program, see C<cmd_parse> for the opposite direction). To pass
characters instead of octets, you should convert your strings first to the
locale-specific encoding using C<< $term->locale_encode >>.

=item $term->tt_write_user_input ($octets)

Like C<tt_write>, but should be used when writing strings in response to
the user pressing a key, to invoke the additional actions requested by
the user for that case (C<tt_write> doesn't do that).

The typical use case would be inside C<on_action> hooks.

=item $term->tt_paste ($octets)

Write the octets given in C<$octets> to the tty as a paste, converting NL to
CR and bracketing the data with control sequences if bracketed paste mode
is set.

=item $old_events = $term->pty_ev_events ([$new_events])

Replaces the event mask of the pty watcher by the given event mask. Can
be used to suppress input and output handling to the pty/tty. See the
description of C<< urxvt::timer->events >>. Make sure to always restore
the previous value.

=item $fd = $term->pty_fd

Returns the master file descriptor for the pty in use, or C<-1> if no pty
is used.

=item $windowid = $term->parent

Return the window id of the toplevel window.

=item $windowid = $term->vt

Return the window id of the terminal window.

=item $term->vt_emask_add ($x_event_mask)

Adds the specified events to the vt event mask. Useful e.g. when you want
to receive pointer events all the times:

   $term->vt_emask_add (urxvt::PointerMotionMask);

=item $term->set_urgency ($set)

Enable/disable the urgency hint on the toplevel window.

=item $term->focus_in

=item $term->focus_out

=item $term->key_press ($state, $keycode[, $time])

=item $term->key_release ($state, $keycode[, $time])

Deliver various fake events to to terminal.

=item $window_width = $term->width ([$new_value])

=item $window_height = $term->height ([$new_value])

=item $font_width = $term->fwidth ([$new_value])

=item $font_height = $term->fheight ([$new_value])

=item $font_ascent = $term->fbase ([$new_value])

=item $terminal_rows = $term->nrow ([$new_value])

=item $terminal_columns = $term->ncol ([$new_value])

=item $has_focus = $term->focus ([$new_value])

=item $is_mapped = $term->mapped ([$new_value])

=item $max_scrollback = $term->saveLines ([$new_value])

=item $nrow_plus_saveLines = $term->total_rows ([$new_value])

=item $topmost_scrollback_row = $term->top_row ([$new_value])

Return various integers describing terminal characteristics. If an
argument is given, changes the value and returns the previous one.

=item $x_display = $term->display_id

Return the DISPLAY used by rxvt-unicode.

=item $lc_ctype = $term->locale

Returns the LC_CTYPE category string used by this rxvt-unicode.

=item $env = $term->env

Returns a copy of the environment in effect for the terminal as a hashref
similar to C<\%ENV>.

=item @envv = $term->envv

Returns the environment as array of strings of the form C<VAR=VALUE>.

=item @argv = $term->argv

Return the argument vector as this terminal, similar to @ARGV, but
includes the program name as first element.

=cut

sub env {
   +{ map /^([^=]+)(?:=(.*))?$/s && ($1 => $2), $_[0]->envv }
}

=item $modifiermask = $term->ModLevel3Mask

=item $modifiermask = $term->ModMetaMask

=item $modifiermask = $term->ModNumLockMask

Return the modifier masks corresponding to the "ISO Level 3 Shift" (often
AltGr), the meta key (often Alt) and the num lock key, if applicable.

=item $screen = $term->current_screen

Returns the currently displayed screen (0 primary, 1 secondary).

=item $cursor_is_hidden = $term->hidden_cursor

Returns whether the cursor is currently hidden or not.

=item $view_start = $term->view_start ([$newvalue])

Returns the row number of the topmost displayed line. Maximum value is
C<0>, which displays the normal terminal contents. Lower values scroll
this many lines into the scrollback buffer.

=item $term->want_refresh

Requests a screen refresh. At the next opportunity, rxvt-unicode will
compare the on-screen display with its stored representation. If they
differ, it redraws the differences.

Used after changing terminal contents to display them.

=item $term->refresh_check

Checks if a refresh has been requested and, if so, schedules one.

=item $text = $term->ROW_t ($row_number[, $new_text[, $start_col]])

Returns the text of the entire row with number C<$row_number>. Row C<< $term->top_row >>
is the topmost terminal line, row C<< $term->nrow-1 >> is the bottommost
terminal line. Nothing will be returned if a nonexistent line
is requested.

If C<$new_text> is specified, it will replace characters in the current
line, starting at column C<$start_col> (default C<0>), which is useful
to replace only parts of a line. The font index in the rendition will
automatically be updated.

C<$text> is in a special encoding: tabs and wide characters that use more
than one cell when displayed are padded with C<$urxvt::NOCHAR> (chr 65535)
characters. Characters with combining characters and other characters that
do not fit into the normal text encoding will be replaced with characters
in the private use area.

You have to obey this encoding when changing text. The advantage is
that C<substr> and similar functions work on screen cells and not on
characters.

The methods C<< $term->special_encode >> and C<< $term->special_decode >>
can be used to convert normal strings into this encoding and vice versa.

=item $rend = $term->ROW_r ($row_number[, $new_rend[, $start_col]])

Like C<< $term->ROW_t >>, but returns an arrayref with rendition
bitsets. Rendition bitsets contain information about colour, font, font
styles and similar information. See also C<< $term->ROW_t >>.

When setting rendition, the font mask will be ignored.

See the section on RENDITION, above.

=item $length = $term->ROW_l ($row_number[, $new_length])

Returns the number of screen cells that are in use ("the line
length"). Unlike the urxvt core, this returns C<< $term->ncol >> if the
line is joined with the following one.

=item $bool = $term->is_longer ($row_number)

Returns true if the row is part of a multiple-row logical "line" (i.e.
joined with the following row), which means all characters are in use
and it is continued on the next row (and possibly a continuation of the
previous row(s)).

=item $line = $term->line ($row_number)

Create and return a new C<urxvt::line> object that stores information
about the logical line that row C<$row_number> is part of. It supports the
following methods:

=over 4

=item $text = $line->t ([$new_text])

Returns or replaces the full text of the line, similar to C<ROW_t>

=item $rend = $line->r ([$new_rend])

Returns or replaces the full rendition array of the line, similar to C<ROW_r>

=item $length = $line->l

Returns the length of the line in cells, similar to C<ROW_l>.

=item $rownum = $line->beg

=item $rownum = $line->end

Return the row number of the first/last row of the line, respectively.

=item $offset = $line->offset_of ($row, $col)

Returns the character offset of the given row|col pair within the logical
line. Works for rows outside the line, too, and returns corresponding
offsets outside the string.

=item ($row, $col) = $line->coord_of ($offset)

Translates a string offset into terminal coordinates again.

=back

=cut

sub line {
   my ($self, $row) = @_;

   my $maxrow = $self->nrow - 1;

   my ($beg, $end) = ($row, $row);

   --$beg while $self->ROW_is_longer ($beg - 1);
   ++$end while $self->ROW_is_longer ($end) && $end < $maxrow;

   bless {
      term => $self,
      beg  => $beg,
      end  => $end,
      ncol => $self->ncol,
      len  => ($end - $beg) * $self->ncol + $self->ROW_l ($end),
   }, urxvt::line::
}

sub urxvt::line::t {
   my ($self) = @_;

   if (@_ > 1) {
      $self->{term}->ROW_t ($_, $_[1], 0, ($_ - $self->{beg}) * $self->{ncol}, $self->{ncol})
         for $self->{beg} .. $self->{end};
   }

   defined wantarray &&
      substr +(join "", map $self->{term}->ROW_t ($_), $self->{beg} .. $self->{end}),
             0, $self->{len}
}

sub urxvt::line::r {
   my ($self) = @_;

   if (@_ > 1) {
      $self->{term}->ROW_r ($_, $_[1], 0, ($_ - $self->{beg}) * $self->{ncol}, $self->{ncol})
         for $self->{beg} .. $self->{end};
   }

   if (defined wantarray) {
      my $rend = [
         map @{ $self->{term}->ROW_r ($_) }, $self->{beg} .. $self->{end}
      ];
      $#$rend = $self->{len} - 1;
      return $rend;
   }

   ()
}

sub urxvt::line::beg { $_[0]{beg} }
sub urxvt::line::end { $_[0]{end} }
sub urxvt::line::l   { $_[0]{len} }

sub urxvt::line::offset_of {
   my ($self, $row, $col) = @_;

   ($row - $self->{beg}) * $self->{ncol} + $col
}

sub urxvt::line::coord_of {
   my ($self, $offset) = @_;

   use integer;

   (
      $offset / $self->{ncol} + $self->{beg},
      $offset % $self->{ncol}
   )
}

=item $text = $term->special_encode $string

Converts a perl string into the special encoding used by rxvt-unicode,
where one character corresponds to one screen cell. See
C<< $term->ROW_t >> for details.

=item $string = $term->special_decode $text

Converts rxvt-unicodes text representation into a perl string. See
C<< $term->ROW_t >> for details.

=item $success = $term->grab_button ($button, $modifiermask[, $window = $term->vt])

=item $term->ungrab_button ($button, $modifiermask[, $window = $term->vt])

Register/unregister a synchronous button grab. See the XGrabButton
manpage.

=item $success = $term->grab ($eventtime[, $sync])

Calls XGrabPointer and XGrabKeyboard in asynchronous (default) or
synchronous (C<$sync> is true). Also remembers the grab timestamp.

=item $term->allow_events_async

Calls XAllowEvents with AsyncBoth for the most recent grab.

=item $term->allow_events_sync

Calls XAllowEvents with SyncBoth for the most recent grab.

=item $term->allow_events_replay

Calls XAllowEvents with both ReplayPointer and ReplayKeyboard for the most
recent grab.

=item $term->ungrab

Calls XUngrabPointer and XUngrabKeyboard for the most recent grab. Is called automatically on
evaluation errors, as it is better to lose the grab in the error case as
the session.

=item $atom = $term->XInternAtom ($atom_name[, $only_if_exists])

=item $atom_name = $term->XGetAtomName ($atom)

=item @atoms = $term->XListProperties ($window)

=item ($type,$format,$octets) = $term->XGetWindowProperty ($window, $property)

=item $term->XChangeProperty ($window, $property, $type, $format, $octets)

=item $term->XDeleteProperty ($window, $property)

=item $window = $term->DefaultRootWindow

=item $term->XReparentWindow ($window, $parent, [$x, $y])

=item $term->XMapWindow ($window)

=item $term->XUnmapWindow ($window)

=item $term->XMoveResizeWindow ($window, $x, $y, $width, $height)

=item ($x, $y, $child_window) = $term->XTranslateCoordinates ($src, $dst, $x, $y)

=item $term->XChangeInput ($window, $add_events[, $del_events])

=item $keysym = $term->XStringToKeysym ($string)

=item $string = $term->XKeysymToString ($keysym)

Various X or X-related functions. The C<$term> object only serves as
the source of the display, otherwise those functions map more-or-less
directly onto the X functions of the same name.

=back

=cut

package urxvt::popup;

=head2 The C<urxvt::popup> Class

=over 4

=cut

sub add_item {
   my ($self, $item) = @_;

   $item->{rend}{normal} = "\x1b[0;30;47m" unless exists $item->{rend}{normal};
   $item->{rend}{hover}  = "\x1b[0;30;46m" unless exists $item->{rend}{hover};
   $item->{rend}{active} = "\x1b[m"        unless exists $item->{rend}{active};

   $item->{render} ||= sub { $_[0]{text} };

   push @{ $self->{item} }, $item;
}

=item $popup->add_title ($title)

Adds a non-clickable title to the popup.

=cut

sub add_title {
   my ($self, $title) = @_;

   $self->add_item ({
      rend => { normal => "\x1b[38;5;11;44m", hover => "\x1b[38;5;11;44m", active => "\x1b[38;5;11;44m" },
      text => $title,
      activate => sub { },
   });
}

=item $popup->add_separator ([$sepchr])

Creates a separator, optionally using the character given as C<$sepchr>.

=cut

sub add_separator {
   my ($self, $sep) = @_;

   $sep ||= "=";

   $self->add_item ({
      rend => { normal => "\x1b[0;30;47m", hover => "\x1b[0;30;47m", active => "\x1b[0;30;47m" },
      text => "",
      render => sub { $sep x $self->{term}->ncol },
      activate => sub { },
   });
}

=item $popup->add_button ($text, $cb)

Adds a clickable button to the popup. C<$cb> is called whenever it is
selected.

=cut

sub add_button {
   my ($self, $text, $cb) = @_;

   $self->add_item ({ type => "button", text => $text, activate => $cb});
}

=item $popup->add_toggle ($text, $initial_value, $cb)

Adds a toggle/checkbox item to the popup. The callback gets called
whenever it gets toggled, with a boolean indicating its new value as its
first argument.

=cut

sub add_toggle {
   my ($self, $text, $value, $cb) = @_;

   my $item; $item = {
      type => "button",
      text => "  $text",
      value => $value,
      render => sub { ($_[0]{value} ? "* " : "  ") . $text },
      activate => sub { $cb->($_[1]{value} = !$_[1]{value}); },
   };

   $self->add_item ($item);
}

=item $popup->show

Displays the popup (which is initially hidden).

=cut

sub show {
   my ($self) = @_;

   local $urxvt::popup::self = $self;

   my $env = $self->{term}->env;
   # we can't hope to reproduce the locale algorithm, so nuke LC_ALL and set LC_CTYPE.
   delete $env->{LC_ALL};
   $env->{LC_CTYPE} = $self->{term}->locale;

   my $term = urxvt::term->new (
      $env, "popup",
      "--perl-lib" => "", "--perl-ext-common" => "",
      "-pty-fd" => -1, "-sl" => 0,
      "-b" => 1, "-bd" => "grey80", "-bl", "-override-redirect",
      "--transient-for" => $self->{term}->parent,
      "-display" => $self->{term}->display_id,
      "-pe" => "urxvt-popup",
   ) or die "unable to create popup window\n";

   unless (delete $term->{urxvt_popup_init_done}) {
      $term->ungrab;
      $term->destroy;
      die "unable to initialise popup window\n";
   }
}

sub DESTROY {
   my ($self) = @_;

   delete $self->{term}{_destroy}{$self};
   $self->{term}->ungrab;
}

=back

=cut

package urxvt::watcher;

=head2 The C<urxvt::timer> Class

This class implements timer watchers/events. Time is represented as a
fractional number of seconds since the epoch. Example:

   $term->{overlay} = $term->overlay (-1, 0, 8, 1, urxvt::OVERLAY_RSTYLE, 0);
   $term->{timer} = urxvt::timer
                    ->new
                    ->interval (1)
                    ->cb (sub {
                       $term->{overlay}->set (0, 0,
                          sprintf "%2d:%02d:%02d", (localtime urxvt::NOW)[2,1,0]);
                    });

=over 4

=item $timer = new urxvt::timer

Create a new timer object in started state. It is scheduled to fire
immediately.

=item $timer = $timer->cb (sub { my ($timer) = @_; ... })

Set the callback to be called when the timer triggers.

=item $timer = $timer->set ($tstamp[, $interval])

Set the time the event is generated to $tstamp (and optionally specifies a
new $interval).

=item $timer = $timer->interval ($interval)

By default (and when C<$interval> is C<0>), the timer will automatically
stop after it has fired once. If C<$interval> is non-zero, then the timer
is automatically rescheduled at the given intervals.

=item $timer = $timer->start

Start the timer.

=item $timer = $timer->start ($tstamp[, $interval])

Set the event trigger time to C<$tstamp> and start the timer. Optionally
also replaces the interval.

=item $timer = $timer->after ($delay[, $interval])

Like C<start>, but sets the expiry timer to c<urxvt::NOW + $delay>.

=item $timer = $timer->stop

Stop the timer.

=back

=head2 The C<urxvt::iow> Class

This class implements io watchers/events. Example:

  $term->{socket} = ...
  $term->{iow} = urxvt::iow
                 ->new
                 ->fd (fileno $term->{socket})
                 ->events (urxvt::EV_READ)
                 ->start
                 ->cb (sub {
                   my ($iow, $revents) = @_;
                   # $revents must be 1 here, no need to check
                   sysread $term->{socket}, my $buf, 8192
                      or end-of-file;
                 });


=over 4

=item $iow = new urxvt::iow

Create a new io watcher object in stopped state.

=item $iow = $iow->cb (sub { my ($iow, $reventmask) = @_; ... })

Set the callback to be called when io events are triggered. C<$reventmask>
is a bitset as described in the C<events> method.

=item $iow = $iow->fd ($fd)

Set the file descriptor (not handle) to watch.

=item $iow = $iow->events ($eventmask)

Set the event mask to watch. The only allowed values are
C<urxvt::EV_READ> and C<urxvt::EV_WRITE>, which might be ORed
together, or C<urxvt::EV_NONE>.

=item $iow = $iow->start

Start watching for requested events on the given handle.

=item $iow = $iow->stop

Stop watching for events on the given file handle.

=back

=head2 The C<urxvt::iw> Class

This class implements idle watchers, that get called automatically when
the process is idle. They should return as fast as possible, after doing
some useful work.

=over 4

=item $iw = new urxvt::iw

Create a new idle watcher object in stopped state.

=item $iw = $iw->cb (sub { my ($iw) = @_; ... })

Set the callback to be called when the watcher triggers.

=item $timer = $timer->start

Start the watcher.

=item $timer = $timer->stop

Stop the watcher.

=back

=head2 The C<urxvt::pw> Class

This class implements process watchers. They create an event whenever a
process exits, after which they stop automatically.

   my $pid = fork;
   ...
   $term->{pw} = urxvt::pw
                    ->new
                    ->start ($pid)
                    ->cb (sub {
                       my ($pw, $exit_status) = @_;
                       ...
                    });

=over 4

=item $pw = new urxvt::pw

Create a new process watcher in stopped state.

=item $pw = $pw->cb (sub { my ($pw, $exit_status) = @_; ... })

Set the callback to be called when the timer triggers.

=item $pw = $timer->start ($pid)

Tells the watcher to start watching for process C<$pid>.

=item $pw = $pw->stop

Stop the watcher.

=back

=head1 ENVIRONMENT

=head2 URXVT_PERL_VERBOSITY

This variable controls the verbosity level of the perl extension. Higher
numbers indicate more verbose output.

=over 4

=item == 0 - fatal messages

=item >= 3 - script loading and management

=item >=10 - all called hooks

=item >=11 - hook return values

=back

=head1 AUTHOR

 Marc Lehmann <schmorp@schmorp.de>
 http://software.schmorp.de/pkg/rxvt-unicode

=cut

1

# vim: sw=3: