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Revision 1.7 by root, Mon Jan 2 19:05:05 2006 UTC vs.
Revision 1.23 by root, Tue Jan 3 19:42:53 2006 UTC

1=encoding utf8
2
1=head1 NAME 3=head1 NAME
2 4
3rxvtperl - rxvt-unicode's embedded perl interpreter 5@@RXVT_NAME@@perl - rxvt-unicode's embedded perl interpreter
4 6
5=head1 SYNOPSIS 7=head1 SYNOPSIS
6 8
7* Put your scripts into F<@@RXVT_LIBDIR@@/urxvt/perl-ext/>, they will be loaded automatically. 9 # create a file grab_test in $HOME:
8
9* Scripts are evaluated in a 'use strict' and 'use utf8' environment, and
10thus must be encoded as UTF-8.
11 10
12 sub on_sel_grab { 11 sub on_sel_grab {
13 warn "you selected ", $_[0]->selection; 12 warn "you selected ", $_[0]->selection;
14 () 13 ()
15 } 14 }
16 15
17 1 16 # start a @@RXVT_NAME@@ using it:
17
18 @@RXVT_NAME@@ --perl-lib $HOME -pe grab_test
18 19
19=head1 DESCRIPTION 20=head1 DESCRIPTION
20 21
21On startup, @@RXVT_NAME@@ will scan F<@@RXVT_LIBDIR@@/urxvt/perl-ext/> 22Everytime a terminal object gets created, scripts specified via the
22for files and will load them. Everytime a terminal object gets created, 23C<perl> resource are loaded and associated with it.
23the directory specified by the C<perl-lib> resource will be additionally 24
24scanned. 25Scripts are compiled in a 'use strict' and 'use utf8' environment, and
26thus must be encoded as UTF-8.
25 27
26Each script will only ever be loaded once, even in @@RXVT_NAME@@d, where 28Each script will only ever be loaded once, even in @@RXVT_NAME@@d, where
27scripts will be shared for all terminals. 29scripts will be shared (but not enabled) for all terminals.
28 30
29Hooks in scripts specified by C<perl-lib> will only be called for the 31=head2 Prepackaged Extensions
30terminals created with that specific option value. 32
33This section describes the extensiosn delivered with this version. You can
34find them in F<@@RXVT_LIBDIR@@/urxvt/perl/>.
35
36You can activate them like this:
37
38 @@RXVT_NAME@@ -pe <extensionname>
39
40=over 4
41
42=item selection
43
44Intelligent selection. This etxension tries to be more intelligent when the user
45extends selections (double-click).
46
47It also offers the following bindable event:
48
49=over 4
50
51=item rot13
52
53Rot-13 the selection when activated. Used via keyboard trigger:
54
55 URxvt.keysym.C-M-r: perl:selection:rot13
56
57=back
58
59=item digital-clock
60
61Displays a digital clock using the built-in overlay.
62
63=item example-refresh-hooks
64
65Displays a very simple digital clock in the upper right corner of the
66window. Illustrates overwriting the refresh callbacks to create your own
67overlays or changes.
68
69=back
31 70
32=head2 General API Considerations 71=head2 General API Considerations
33 72
34All objects (such as terminals, time watchers etc.) are typical 73All objects (such as terminals, time watchers etc.) are typical
35reference-to-hash objects. The hash can be used to store anything you 74reference-to-hash objects. The hash can be used to store anything you
36like. All members starting with an underscore (such as C<_ptr> or 75like. All members starting with an underscore (such as C<_ptr> or
37C<_hook>) are reserved for internal uses and must not be accessed or 76C<_hook>) are reserved for internal uses and B<MUST NOT> be accessed or
38modified). 77modified).
39 78
40When objects are destroyed on the C++ side, the perl object hashes are 79When objects are destroyed on the C++ side, the perl object hashes are
41emptied, so its best to store related objects such as time watchers and 80emptied, so its best to store related objects such as time watchers and
42the like inside the terminal object so they get destroyed as soon as the 81the like inside the terminal object so they get destroyed as soon as the
43terminal is destroyed. 82terminal is destroyed.
44 83
45=head2 Hooks 84=head2 Hooks
46 85
47The following subroutines can be declared in loaded scripts, and will be called 86The following subroutines can be declared in loaded scripts, and will be
48whenever the relevant event happens. 87called whenever the relevant event happens.
88
89The first argument passed to them is an object private to each terminal
90and extension package. You can call all C<urxvt::term> methods on it, but
91its not a real C<urxvt::term> object. Instead, the real C<urxvt::term>
92object that is shared between all packages is stored in the C<term>
93member.
49 94
50All of them must return a boolean value. If it is true, then the event 95All of them must return a boolean value. If it is true, then the event
51counts as being I<consumed>, and the invocation of other hooks is skipped, 96counts as being I<consumed>, and the invocation of other hooks is skipped,
52and the relevant action might not be carried out by the C++ code. 97and the relevant action might not be carried out by the C++ code.
53 98
85Called whenever a selection has been copied, but before the selection is 130Called whenever a selection has been copied, but before the selection is
86requested from the server. The selection text can be queried and changed 131requested from the server. The selection text can be queried and changed
87by calling C<< $term->selection >>. 132by calling C<< $term->selection >>.
88 133
89Returning a true value aborts selection grabbing. It will still be hilighted. 134Returning a true value aborts selection grabbing. It will still be hilighted.
135
136=item on_sel_extend $term
137
138Called whenever the user tries to extend the selection (e.g. with a double
139click) and is either supposed to return false (normal operation), or
140should extend the selection itelf and return true to suppress the built-in
141processing.
142
143See the F<selection> example extension.
90 144
91=item on_focus_in $term 145=item on_focus_in $term
92 146
93Called whenever the window gets the keyboard focus, before urxvt does 147Called whenever the window gets the keyboard focus, before urxvt does
94focus in processing. 148focus in processing.
127 181
128=item on_refresh_end $term 182=item on_refresh_end $term
129 183
130Called just after the screen gets redrawn. See C<on_refresh_begin>. 184Called just after the screen gets redrawn. See C<on_refresh_begin>.
131 185
186=item on_keyboard_command $term, $string
187
188Called whenever the user presses a key combination that has a
189C<perl:string> action bound to it (see description of the B<keysym>
190resource in the @@RXVT_NAME@@(1) manpage).
191
192=back
193
194=head2 Variables in the C<urxvt> Package
195
196=over 4
197
198=item $urxvt::TERM
199
200The current terminal. Whenever a callback/Hook is bein executed, this
201variable stores the current C<urxvt::term> object.
202
132=back 203=back
133 204
134=head2 Functions in the C<urxvt> Package 205=head2 Functions in the C<urxvt> Package
135 206
136=over 4 207=over 4
152 223
153=item $time = urxvt::NOW 224=item $time = urxvt::NOW
154 225
155Returns the "current time" (as per the event loop). 226Returns the "current time" (as per the event loop).
156 227
228=back
229
230=head2 RENDITION
231
232Rendition bitsets contain information about colour, font, font styles and
233similar information for each screen cell.
234
235The following "macros" deal with changes in rendition sets. You should
236never just create a bitset, you should always modify an existing one,
237as they contain important information required for correct operation of
238rxvt-unicode.
239
240=over 4
241
242=item $rend = urxvt::DEFAULT_RSTYLE
243
244Returns the default rendition, as used when the terminal is starting up or
245being reset. Useful as a base to start when creating renditions.
246
247=item $rend = urxvt::OVERLAY_RSTYLE
248
249Return the rendition mask used for overlays by default.
250
251=item $rendbit = urxvt::RS_Bold, RS_Italic, RS_Blink, RS_RVid, RS_Uline
252
253Return the bit that enabled bold, italic, blink, reverse-video and
254underline, respectively. To enable such a style, just logically OR it into
255the bitset.
256
257=item $foreground = urxvt::GET_BASEFG $rend
258
259=item $background = urxvt::GET_BASEBG $rend
260
261Return the foreground/background colour index, respectively.
262
263=item $rend = urxvt::SET_FGCOLOR ($rend, $new_colour)
264
265=item $rend = urxvt::SET_BGCOLOR ($rend, $new_colour)
266
267Replace the foreground/background colour in the rendition mask with the
268specified one.
269
270=item $value = urxvt::GET_CUSTOM ($rend)
271
272Return the "custom" value: Every rendition has 5 bits for use by
273extensions. They can be set and changed as you like and are initially
274zero.
275
276=item $rend = urxvt::SET_CUSTOM ($rend, $new_value)
277
278Change the custom value.
279
280=back
281
157=cut 282=cut
158 283
159package urxvt; 284package urxvt;
160 285
161use strict; 286use strict;
287use Scalar::Util ();
162 288
163our $term; 289our $TERM;
164our @HOOKNAME; 290our @HOOKNAME;
165our $LIBDIR; 291our $LIBDIR;
166 292
167BEGIN { 293BEGIN {
168 urxvt->bootstrap; 294 urxvt->bootstrap;
174 unless $msg =~ /\n$/; 300 unless $msg =~ /\n$/;
175 urxvt::warn ($msg); 301 urxvt::warn ($msg);
176 }; 302 };
177} 303}
178 304
305my @hook_count;
179my $verbosity = $ENV{URXVT_PERL_VERBOSITY}; 306my $verbosity = $ENV{URXVT_PERL_VERBOSITY};
180 307
181sub verbose { 308sub verbose {
182 my ($level, $msg) = @_; 309 my ($level, $msg) = @_;
183 warn "$msg\n" if $level < $verbosity; 310 warn "$msg\n" if $level <= $verbosity;
184}
185
186my %hook_global;
187my @hook_count;
188
189# called by the rxvt core
190sub invoke {
191 local $term = shift;
192 my $htype = shift;
193
194 verbose 10, "$HOOKNAME[$htype] (" . (join ", ", $term, @_) . ")"
195 if $verbosity >= 10;
196
197 for my $cb ($hook_global{_hook}[$htype], $term->{_hook}[$htype]) {
198 $cb or next;
199
200 while (my ($k, $v) = each %$cb) {
201 return 1 if $v->($term, @_);
202 }
203 }
204
205 0
206} 311}
207 312
208# find on_xxx subs in the package and register them 313# find on_xxx subs in the package and register them
209# as hooks 314# as hooks
210sub register_package($) { 315sub register_package($) {
214 my $name = $HOOKNAME[$htype]; 319 my $name = $HOOKNAME[$htype];
215 320
216 my $ref = $pkg->can ("on_" . lc $name) 321 my $ref = $pkg->can ("on_" . lc $name)
217 or next; 322 or next;
218 323
219 $term->{_hook}[$htype]{$ref*1} = $ref; 324 $TERM->{_hook}[$htype]{$pkg} = $ref;
220 $hook_count[$htype]++ 325 $hook_count[$htype]++
221 or set_should_invoke $htype, 1; 326 or set_should_invoke $htype, 1;
222 } 327 }
223} 328}
224 329
228# load a single script into its own package, once only 333# load a single script into its own package, once only
229sub script_package($) { 334sub script_package($) {
230 my ($path) = @_; 335 my ($path) = @_;
231 336
232 $script_pkg{$path} ||= do { 337 $script_pkg{$path} ||= do {
233 my $pkg = $script_pkg++; 338 my $pkg = "urxvt::" . ($script_pkg++);
339
234 verbose 3, "loading script '$path' into package '$pkg'"; 340 verbose 3, "loading script '$path' into package '$pkg'";
235 341
236 open my $fh, "<:raw", $path 342 open my $fh, "<:raw", $path
237 or die "$path: $!"; 343 or die "$path: $!";
238 344
239 eval "package $pkg; use strict; use utf8;\n" 345 my $source = "package $pkg; use strict; use utf8;\n"
240 . "#line 1 \"$path\"\n" 346 . "#line 1 \"$path\"\n{\n"
241 . do { local $/; <$fh> } 347 . (do { local $/; <$fh> })
348 . "\n};\n1";
349
242 or die "$path: $@"; 350 eval $source or die "$path: $@";
243 351
244 $pkg 352 $pkg
245 } 353 }
246} 354}
247 355
248sub load_scripts($) { 356# called by the rxvt core
249 my ($dir) = @_; 357sub invoke {
358 local $TERM = shift;
359 my $htype = shift;
250 360
251 verbose 3, "loading scripts from '$dir'"; 361 if ($htype == 0) { # INIT
362 my @dirs = ((split /:/, $TERM->resource ("perl_lib")), "$LIBDIR/perl");
252 363
364 for my $ext (split /:/, $TERM->resource ("perl_ext")) {
365 my @files = grep -f $_, map "$_/$ext", @dirs;
366
367 if (@files) {
253 register_package script_package $_ 368 register_package script_package $files[0];
254 for grep -f $_, 369 } else {
255 <$dir/*>; 370 warn "perl extension '$ext' not found in perl library search path\n";
371 }
372 }
373
374 } elsif ($htype == 1) { # DESTROY
375 if (my $hook = $TERM->{_hook}) {
376 for my $htype (0..$#$hook) {
377 $hook_count[$htype] -= scalar keys %{ $hook->[$htype] || {} }
378 or set_should_invoke $htype, 0;
379 }
380 }
381 }
382
383 my $cb = $TERM->{_hook}[$htype]
384 or return;
385
386 verbose 10, "$HOOKNAME[$htype] (" . (join ", ", $TERM, @_) . ")"
387 if $verbosity >= 10;
388
389 while (my ($pkg, $cb) = each %$cb) {
390 return 1
391 if $cb->(
392 $TERM->{$pkg} ||= do {
393 my $proxy = bless { }, urxvt::term::proxy::;
394 Scalar::Util::weaken ($proxy->{term} = $TERM);
395 $proxy
396 },
397 @_,
398 );
399 }
400
401 0
256} 402}
257 403
258sub on_init { 404sub urxvt::term::proxy::AUTOLOAD {
259 my ($term) = @_; 405 $urxvt::term::proxy::AUTOLOAD =~ /:([^:]+)$/
406 or die "FATAL: \$AUTOLOAD '$urxvt::term::proxy::AUTOLOAD' unparsable";
260 407
261 my $libdir = $term->resource ("perl_lib"); 408 eval qq{
409 sub $urxvt::term::proxy::AUTOLOAD {
410 unshift \@_, shift->{term};
411 goto &urxvt::term::$1;
412 }
413 1
414 } or die "FATAL: unable to compile method forwarder: $@";
262 415
263 load_scripts $libdir 416 goto &$urxvt::term::proxy::AUTOLOAD;
264 if defined $libdir;
265} 417}
266
267sub on_destroy {
268 my ($term) = @_;
269
270 my $hook = $term->{_hook}
271 or return;
272
273 for my $htype (0..$#$hook) {
274 $hook_count[$htype] -= scalar keys %{ $hook->[$htype] || {} }
275 or set_should_invoke $htype, 0;
276 }
277}
278
279{
280 local $term = \%hook_global;
281
282 register_package __PACKAGE__;
283 load_scripts "$LIBDIR/perl-ext";
284}
285
286=back
287 418
288=head2 The C<urxvt::term> Class 419=head2 The C<urxvt::term> Class
289 420
290=over 4 421=over 4
291 422
312 443
313 answerbackstring backgroundPixmap backspace_key boldFont boldItalicFont 444 answerbackstring backgroundPixmap backspace_key boldFont boldItalicFont
314 borderLess color cursorBlink cursorUnderline cutchars delete_key 445 borderLess color cursorBlink cursorUnderline cutchars delete_key
315 display_name embed ext_bwidth fade font geometry hold iconName 446 display_name embed ext_bwidth fade font geometry hold iconName
316 imFont imLocale inputMethod insecure int_bwidth intensityStyles 447 imFont imLocale inputMethod insecure int_bwidth intensityStyles
317 italicFont jumpScroll lineSpace loginShell mapAlert menu meta8 448 italicFont jumpScroll lineSpace loginShell mapAlert menu meta8 modifier
318 modifier mouseWheelScrollPage name pastableTabs path perl perl_eval 449 mouseWheelScrollPage name pastableTabs path perl_eval perl_ext
319 perl_lib pointerBlank pointerBlankDelay preeditType print_pipe pty_fd 450 perl_lib pointerBlank pointerBlankDelay preeditType print_pipe pty_fd
320 reverseVideo saveLines scrollBar scrollBar_align scrollBar_floating 451 reverseVideo saveLines scrollBar scrollBar_align scrollBar_floating
321 scrollBar_right scrollBar_thickness scrollTtyKeypress scrollTtyOutput 452 scrollBar_right scrollBar_thickness scrollTtyKeypress scrollTtyOutput
322 scrollWithBuffer scrollstyle secondaryScreen secondaryScroll selectstyle 453 scrollWithBuffer scrollstyle secondaryScreen secondaryScroll selectstyle
323 shade term_name title transparent transparent_all tripleclickwords 454 shade term_name title transparent transparent_all tripleclickwords
347 478
348=item $oldtext = $term->selection ([$newtext]) 479=item $oldtext = $term->selection ([$newtext])
349 480
350Return the current selection text and optionally replace it by C<$newtext>. 481Return the current selection text and optionally replace it by C<$newtext>.
351 482
352=item $term->scr_overlay ($x, $y, $text) 483#=item $term->overlay ($x, $y, $text)
353 484#
354Create a simple multi-line overlay box. See the next method for details. 485#Create a simple multi-line overlay box. See the next method for details.
355 486#
356=cut 487#=cut
357 488
358sub urxvt::term::scr_overlay { 489sub urxvt::term::scr_overlay {
490die;
359 my ($self, $x, $y, $text) = @_; 491 my ($self, $x, $y, $text) = @_;
360 492
361 my @lines = split /\n/, $text; 493 my @lines = split /\n/, $text;
362 494
363 my $w = 0; 495 my $w = 0;
367 499
368 $self->scr_overlay_new ($x, $y, $w, scalar @lines); 500 $self->scr_overlay_new ($x, $y, $w, scalar @lines);
369 $self->scr_overlay_set (0, $_, $lines[$_]) for 0.. $#lines; 501 $self->scr_overlay_set (0, $_, $lines[$_]) for 0.. $#lines;
370} 502}
371 503
372=item $term->scr_overlay_new ($x, $y, $width, $height) 504=item $term->overlay ($x, $y, $width, $height[, $rstyle[, $border]])
373 505
374Create a new (empty) overlay at the given position with the given 506Create a new (empty) overlay at the given position with the given
375width/height. A border will be put around the box. If either C<$x> or 507width/height. C<$rstyle> defines the initial rendition style
376C<$y> is negative, then this is counted from the right/bottom side, 508(default: C<OVERLAY_RSTYLE>).
377respectively.
378 509
379=item $term->scr_overlay_off 510If C<$border> is C<2> (default), then a decorative border will be put
511around the box.
380 512
381Switch the overlay off again. 513If either C<$x> or C<$y> is negative, then this is counted from the
514right/bottom side, respectively.
382 515
383=item $term->scr_overlay_set_char ($x, $y, $char, $rend = OVERLAY_RSTYLE) 516This method returns an urxvt::overlay object. The overlay will be visible
517as long as the perl object is referenced.
384 518
385Put a single character (specified numerically) at the given overlay 519The methods currently supported on C<urxvt::overlay> objects are:
386position.
387 520
521=over 4
522
388=item $term->scr_overlay_set ($x, $y, $text) 523=item $overlay->set ($x, $y, $text, $rend)
389 524
390Write a string at the given position into the overlay. 525Similar to C<< $term->ROW_t >> and C<< $term->ROW_r >> in that it puts
526text in rxvt-unicode's special encoding and an array of rendition values
527at a specific position inside the overlay.
528
529=item $overlay->hide
530
531If visible, hide the overlay, but do not destroy it.
532
533=item $overlay->show
534
535If hidden, display the overlay again.
536
537=back
391 538
392=item $cellwidth = $term->strwidth $string 539=item $cellwidth = $term->strwidth $string
393 540
394Returns the number of screen-cells this string would need. Correctly 541Returns the number of screen-cells this string would need. Correctly
395accounts for wide and combining characters. 542accounts for wide and combining characters.
403Convert the given locale-encoded octets into a perl string. 550Convert the given locale-encoded octets into a perl string.
404 551
405=item $term->tt_write ($octets) 552=item $term->tt_write ($octets)
406 553
407Write the octets given in C<$data> to the tty (i.e. as program input). To 554Write the octets given in C<$data> to the tty (i.e. as program input). To
408pass characters instead of octets, you should convetr you strings first to 555pass characters instead of octets, you should convert your strings first
409the locale-specific encoding using C<< $term->locale_encode >>. 556to the locale-specific encoding using C<< $term->locale_encode >>.
557
558=item $nrow = $term->nrow
559
560=item $ncol = $term->ncol
561
562Return the number of rows/columns of the terminal window (i.e. as
563specified by C<-geometry>, excluding any scrollback).
564
565=item $nsaved = $term->nsaved
566
567Returns the number of lines in the scrollback buffer.
568
569=item $view_start = $term->view_start ([$newvalue])
570
571Returns the negative row number of the topmost line. Minimum value is
572C<0>, which displays the normal terminal contents. Larger values scroll
573this many lines into the scrollback buffer.
574
575=item $term->want_refresh
576
577Requests a screen refresh. At the next opportunity, rxvt-unicode will
578compare the on-screen display with its stored representation. If they
579differ, it redraws the differences.
580
581Used after changing terminal contents to display them.
582
583=item $text = $term->ROW_t ($row_number[, $new_text[, $start_col]])
584
585Returns the text of the entire row with number C<$row_number>. Row C<0>
586is the topmost terminal line, row C<< $term->$ncol-1 >> is the bottommost
587terminal line. The scrollback buffer starts at line C<-1> and extends to
588line C<< -$term->nsaved >>.
589
590If C<$new_text> is specified, it will replace characters in the current
591line, starting at column C<$start_col> (default C<0>), which is useful
592to replace only parts of a line. The font index in the rendition will
593automatically be updated.
594
595C<$text> is in a special encoding: tabs and wide characters that use more
596than one cell when displayed are padded with urxvt::NOCHAR characters
597(C<chr 65535>). Characters with combining characters and other characters
598that do not fit into the normal tetx encoding will be replaced with
599characters in the private use area.
600
601You have to obey this encoding when changing text. The advantage is
602that C<substr> and similar functions work on screen cells and not on
603characters.
604
605The methods C<< $term->special_encode >> and C<< $term->special_decode >>
606can be used to convert normal strings into this encoding and vice versa.
607
608=item $rend = $term->ROW_r ($row_number[, $new_rend[, $start_col]])
609
610Like C<< $term->ROW_t >>, but returns an arrayref with rendition
611bitsets. Rendition bitsets contain information about colour, font, font
612styles and similar information. See also C<< $term->ROW_t >>.
613
614When setting rendition, the font mask will be ignored.
615
616See the section on RENDITION, above.
617
618=item $length = $term->ROW_l ($row_number[, $new_length])
619
620Returns the number of screen cells that are in use ("the line length"). If
621it is C<-1>, then the line is part of a multiple-row logical "line", which
622means all characters are in use and it is continued on the next row.
623
624=item $text = $term->special_encode $string
625
626Converts a perl string into the special encoding used by rxvt-unicode,
627where one character corresponds to one screen cell. See
628C<< $term->ROW_t >> for details.
629
630=item $string = $term->special_decode $text
631
632Converts rxvt-unicodes text reprsentation into a perl string. See
633C<< $term->ROW_t >> for details.
410 634
411=back 635=back
412 636
413=head2 The C<urxvt::timer> Class 637=head2 The C<urxvt::timer> Class
414 638
415This class implements timer watchers/events. Time is represented as a 639This class implements timer watchers/events. Time is represented as a
416fractional number of seconds since the epoch. Example: 640fractional number of seconds since the epoch. Example:
417 641
418 # create a digital clock display in upper right corner 642 $term->{overlay} = $term->overlay (-1, 0, 8, 1, urxvt::OVERLAY_RSTYLE, 0);
419 $term->{timer} = urxvt::timer 643 $term->{timer} = urxvt::timer
420 ->new 644 ->new
421 ->start (urxvt::NOW) 645 ->interval (1)
422 ->cb (sub { 646 ->cb (sub {
423 my ($timer) = @_;
424 my $time = $timer->at;
425 $timer->start ($time + 1);
426 $self->scr_overlay (-1, 0, 647 $term->{overlay}->set (0, 0,
427 POSIX::strftime "%H:%M:%S", localtime $time); 648 sprintf "%2d:%02d:%02d", (localtime urxvt::NOW)[2,1,0]);
428 }); 649 });
429 650
430=over 4 651=over 4
431 652
432=item $timer = new urxvt::timer 653=item $timer = new urxvt::timer
433 654
434Create a new timer object in stopped state. 655Create a new timer object in started state. It is scheduled to fire
656immediately.
435 657
436=item $timer = $timer->cb (sub { my ($timer) = @_; ... }) 658=item $timer = $timer->cb (sub { my ($timer) = @_; ... })
437 659
438Set the callback to be called when the timer triggers. 660Set the callback to be called when the timer triggers.
439 661
442Return the time this watcher will fire next. 664Return the time this watcher will fire next.
443 665
444=item $timer = $timer->set ($tstamp) 666=item $timer = $timer->set ($tstamp)
445 667
446Set the time the event is generated to $tstamp. 668Set the time the event is generated to $tstamp.
669
670=item $timer = $timer->interval ($interval)
671
672Normally (and when C<$interval> is C<0>), the timer will automatically
673stop after it has fired once. If C<$interval> is non-zero, then the timer
674is automatically rescheduled at the given intervals.
447 675
448=item $timer = $timer->start 676=item $timer = $timer->start
449 677
450Start the timer. 678Start the timer.
451 679

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