[ViewVC] Diff of: cvs/rxvt-unicode/src/urxvt.pm

Comparing rxvt-unicode/src/urxvt.pm (file contents):
Revision 1.58 by root, Sun Jan 8 22:58:13 2006 UTC vs.
Revision 1.87 by root, Thu Jan 12 05:37:34 2006 UTC

…		…
26	thus must be encoded as UTF-8.	26	thus must be encoded as UTF-8.
27		27
28	Each script will only ever be loaded once, even in @@RXVT_NAME@@d, where	28	Each script will only ever be loaded once, even in @@RXVT_NAME@@d, where
29	scripts will be shared (but not enabled) for all terminals.	29	scripts will be shared (but not enabled) for all terminals.
30		30
31	=head2 Prepackaged Extensions	31	=head1 PREPACKAGED EXTENSIONS
32		32
33	This section describes the extensiosn delivered with this version. You can	33	This section describes the extensions delivered with this release. You can
34	find them in F<@@RXVT_LIBDIR@@/urxvt/perl/>.	34	find them in F<@@RXVT_LIBDIR@@/urxvt/perl/>.
35		35
36	You can activate them like this:	36	You can activate them like this:
37		37
38	@@RXVT_NAME@@ -pe <extensionname>	38	@@RXVT_NAME@@ -pe <extensionname>
39		39
40	=over 4	40	=over 4
41		41
42	=item selection (enabled by default)	42	=item selection (enabled by default)
43		43
44	Intelligent selection. This extension tries to be more intelligent when	44	(More) intelligent selection. This extension tries to be more intelligent
45	the user extends selections (double-click). Right now, it tries to select	45	when the user extends selections (double-click and further clicks). Right
46	urls and complete shell-quoted arguments, which is very convenient, too,	46	now, it tries to select words, urls and complete shell-quoted
47	if your F<ls> supports C<--quoting-style=shell>.	47	arguments, which is very convenient, too, if your F<ls> supports
		48	C<--quoting-style=shell>.
48		49
		50	A double-click usually selects the word under the cursor, further clicks
		51	will enlarge the selection.
		52
49	It also offers the following bindable event:	53	It also offers the following bindable keyboard command:
50		54
51	=over 4	55	=over 4
52		56
53	=item rot13	57	=item rot13
54		58
…		…
58		62
59	=back	63	=back
60		64
61	=item option-popup (enabled by default)	65	=item option-popup (enabled by default)
62		66
63	Binds a popup menu to Ctrl-Button3 that lets you toggle (some) options at	67	Binds a popup menu to Ctrl-Button2 that lets you toggle (some) options at
64	runtime.	68	runtime.
65		69
		70	=item selection-popup (enabled by default)
		71
		72	Binds a popup menu to Ctrl-Button3 that lets you convert the selection
		73	text into various other formats/action (such as uri unescaping, perl
		74	evalution, web-browser starting etc.), depending on content.
		75
		76	=item searchable-scrollback<hotkey> (enabled by default)
		77
		78	Adds regex search functionality to the scrollback buffer, triggered
		79	by a hotkey (default: C<M-s>). While in search mode, normal terminal
		80	input/output is suspended and a regex is displayed at the bottom of the
		81	screen.
		82
		83	Inputting characters appends them to the regex and continues incremental
		84	search. C<BackSpace> removes a character from the regex, C<Up> and C<Down>
		85	search upwards/downwards in the scrollback buffer, C<End> jumps to the
		86	bottom. C<Escape> leaves search mode and returns to the point where search
		87	was started, while C<Enter> or C<Return> stay at the current position and
		88	additionally stores the first match in the current line into the primary
		89	selection.
		90
66	=item digital-clock	91	=item digital-clock
67		92
68	Displays a digital clock using the built-in overlay.	93	Displays a digital clock using the built-in overlay.
69		94
70	=item mark-urls	95	=item mark-urls
71		96
72	Uses per-line display filtering (C<on_line_update>) to underline urls.	97	Uses per-line display filtering (C<on_line_update>) to underline urls and
		98	make them clickable. When middle-clicked, the program specified in the
		99	resource C<urlLauncher> (default C<x-www-browser>) will be started with
		100	the URL as first argument.
73		101
74	=item block-graphics-to-ascii	102	=item block-graphics-to-ascii
75		103
76	A not very useful example of filtering all text output to the terminal,	104	A not very useful example of filtering all text output to the terminal,
77	by replacing all line-drawing characters (U+2500 .. U+259F) by a	105	by replacing all line-drawing characters (U+2500 .. U+259F) by a
…		…
82	Displays a very simple digital clock in the upper right corner of the	110	Displays a very simple digital clock in the upper right corner of the
83	window. Illustrates overwriting the refresh callbacks to create your own	111	window. Illustrates overwriting the refresh callbacks to create your own
84	overlays or changes.	112	overlays or changes.
85		113
86	=back	114	=back
		115
		116	=head1 API DOCUMENTATION
87		117
88	=head2 General API Considerations	118	=head2 General API Considerations
89		119
90	All objects (such as terminals, time watchers etc.) are typical	120	All objects (such as terminals, time watchers etc.) are typical
91	reference-to-hash objects. The hash can be used to store anything you	121	reference-to-hash objects. The hash can be used to store anything you
…		…
104	=over 4	134	=over 4
105		135
106	=item $text	136	=item $text
107		137
108	Rxvt-unicodes special way of encoding text, where one "unicode" character	138	Rxvt-unicodes special way of encoding text, where one "unicode" character
109	always represents one screen cell. See L<row_t> for a discussion of this format.	139	always represents one screen cell. See L<ROW_t> for a discussion of this format.
110		140
111	=item $string	141	=item $string
112		142
113	A perl text string, with an emphasis on I<text>. It can store all unicode	143	A perl text string, with an emphasis on I<text>. It can store all unicode
114	characters and is to be distinguished with text encoded in a specific	144	characters and is to be distinguished with text encoded in a specific
…		…
119	Either binary data or - more common - a text string encoded in a	149	Either binary data or - more common - a text string encoded in a
120	locale-specific way.	150	locale-specific way.
121		151
122	=back	152	=back
123		153
		154	=head2 Extension Objects
		155
		156	Very perl extension is a perl class. A separate perl object is created
		157	for each terminal and each extension and passed as the first parameter to
		158	hooks. So extensions can use their C<$self> object without having to think
		159	about other extensions, with the exception of methods and members that
		160	begin with an underscore character C<_>: these are reserved for internal
		161	use.
		162
		163	Although it isn't a C<urxvt::term> object, you can call all methods of the
		164	C<urxvt::term> class on this object.
		165
		166	It has the following methods and data members:
		167
		168	=over 4
		169
		170	=item $urxvt_term = $self->{term}
		171
		172	Returns the C<urxvt::term> object associated with this instance of the
		173	extension. This member I<must not> be changed in any way.
		174
		175	=item $self->enable ($hook_name => $cb, [$hook_name => $cb..])
		176
		177	Dynamically enable the given hooks (named without the C<on_> prefix) for
		178	this extension, replacing any previous hook. This is useful when you want
		179	to overwrite time-critical hooks only temporarily.
		180
		181	=item $self->disable ($hook_name[, $hook_name..])
		182
		183	Dynamically disable the given hooks.
		184
		185	=back
		186
124	=head2 Hooks	187	=head2 Hooks
125		188
126	The following subroutines can be declared in extension files, and will be	189	The following subroutines can be declared in extension files, and will be
127	called whenever the relevant event happens.	190	called whenever the relevant event happens.
128		191
129	The first argument passed to them is an object private to each terminal	192	The first argument passed to them is an extension oject as described in
130	and extension package. You can call all C<urxvt::term> methods on it, but	193	the in the C<Extension Objects> section.
131	its not a real C<urxvt::term> object. Instead, the real C<urxvt::term>
132	object that is shared between all packages is stored in the C<term>
133	member. It is, however, blessed intot he package of the extension script,
134	so for all practical purposes you can treat an extension script as a class.
135		194
136	All of them must return a boolean value. If it is true, then the event	195	B<All> of these hooks must return a boolean value. If it is true, then the
137	counts as being I<consumed>, and the invocation of other hooks is skipped,	196	event counts as being I<consumed>, and the invocation of other hooks is
138	and the relevant action might not be carried out by the C++ code.	197	skipped, and the relevant action might not be carried out by the C++ code.
139		198
140	When in doubt, return a false value (preferably C<()>).	199	I<< When in doubt, return a false value (preferably C<()>). >>
141		200
142	=over 4	201	=over 4
143		202
144	=item on_init $term	203	=item on_init $term
145		204
…		…
180	=item on_sel_extend $term	239	=item on_sel_extend $term
181		240
182	Called whenever the user tries to extend the selection (e.g. with a double	241	Called whenever the user tries to extend the selection (e.g. with a double
183	click) and is either supposed to return false (normal operation), or	242	click) and is either supposed to return false (normal operation), or
184	should extend the selection itelf and return true to suppress the built-in	243	should extend the selection itelf and return true to suppress the built-in
185	processing.	244	processing. This can happen multiple times, as long as the callback
		245	returns true, it will be called on every further click by the user and is
		246	supposed to enlarge the selection more and more, if possible.
186		247
187	See the F<selection> example extension.	248	See the F<selection> example extension.
188		249
189	=item on_view_change $term, $offset	250	=item on_view_change $term, $offset
190		251
…		…
199	than the scroll back buffer or the terminal.	260	than the scroll back buffer or the terminal.
200		261
201	It is called before lines are scrolled out (so rows 0 .. min ($lines - 1,	262	It is called before lines are scrolled out (so rows 0 .. min ($lines - 1,
202	$nrow - 1) represent the lines to be scrolled out). C<$saved> is the total	263	$nrow - 1) represent the lines to be scrolled out). C<$saved> is the total
203	number of lines that will be in the scrollback buffer.	264	number of lines that will be in the scrollback buffer.
204
205	=item on_tty_activity $term NYI
206
207	Called whenever the program(s) running in the urxvt window send output.
208		265
209	=item on_osc_seq $term, $string	266	=item on_osc_seq $term, $string
210		267
211	Called whenever the B<ESC ] 777 ; string ST> command sequence (OSC =	268	Called whenever the B<ESC ] 777 ; string ST> command sequence (OSC =
212	operating system command) is processed. Cursor position and other state	269	operating system command) is processed. Cursor position and other state
…		…
225	can filter/change and output the text yourself by returning a true value	282	can filter/change and output the text yourself by returning a true value
226	and calling C<< $term->scr_add_lines >> yourself. Please note that this	283	and calling C<< $term->scr_add_lines >> yourself. Please note that this
227	might be very slow, however, as your hook is called for B<all> text being	284	might be very slow, however, as your hook is called for B<all> text being
228	output.	285	output.
229		286
		287	=item on_tt_write $term, $octets
		288
		289	Called whenever some data is written to the tty/pty and can be used to
		290	suppress or filter tty input.
		291
230	=item on_line_update $term, $row	292	=item on_line_update $term, $row
231		293
232	Called whenever a line was updated or changed. Can be used to filter	294	Called whenever a line was updated or changed. Can be used to filter
233	screen output (e.g. underline urls or other useless stuff). Only lines	295	screen output (e.g. underline urls or other useless stuff). Only lines
234	that are being shown will be filtered, and, due to performance reasons,	296	that are being shown will be filtered, and, due to performance reasons,
…		…
266	=item on_focus_out $term	328	=item on_focus_out $term
267		329
268	Called wheneever the window loses keyboard focus, before rxvt-unicode does	330	Called wheneever the window loses keyboard focus, before rxvt-unicode does
269	focus out processing.	331	focus out processing.
270		332
271	=item on_key_press $term, $event, $octets	333	=item on_key_press $term, $event, $keysym, $octets
272		334
273	=item on_key_release $term, $event	335	=item on_key_release $term, $event, $keysym
274		336
275	=item on_button_press $term, $event	337	=item on_button_press $term, $event
276		338
277	=item on_button_release $term, $event	339	=item on_button_release $term, $event
278		340
…		…
294		356
295	subwindow.	357	subwindow.
296		358
297	=back	359	=back
298		360
		361	=cut
		362
		363	package urxvt;
		364
		365	use utf8;
		366	use strict;
		367	use Carp ();
		368	use Scalar::Util ();
		369	use List::Util ();
		370
		371	our $VERSION = 1;
		372	our $TERM;
		373	our @HOOKNAME;
		374	our %HOOKTYPE = map +($HOOKNAME[$_] => $_), 0..$#HOOKNAME;
		375	our %OPTION;
		376
		377	our $LIBDIR;
		378	our $RESNAME;
		379	our $RESCLASS;
		380	our $RXVTNAME;
		381
299	=head2 Variables in the C<urxvt> Package	382	=head2 Variables in the C<urxvt> Package
300		383
301	=over 4	384	=over 4
		385
		386	=item $urxvt::LIBDIR
		387
		388	The rxvt-unicode library directory, where, among other things, the perl
		389	modules and scripts are stored.
		390
		391	=item $urxvt::RESCLASS, $urxvt::RESCLASS
		392
		393	The resource class and name rxvt-unicode uses to look up X resources.
		394
		395	=item $urxvt::RXVTNAME
		396
		397	The basename of the installed binaries, usually C<urxvt>.
302		398
303	=item $urxvt::TERM	399	=item $urxvt::TERM
304		400
305	The current terminal. This variable stores the current C<urxvt::term>	401	The current terminal. This variable stores the current C<urxvt::term>
306	object, whenever a callback/hook is executing.	402	object, whenever a callback/hook is executing.
…		…
308	=back	404	=back
309		405
310	=head2 Functions in the C<urxvt> Package	406	=head2 Functions in the C<urxvt> Package
311		407
312	=over 4	408	=over 4
313
314	=item $term = new urxvt [arg...]
315
316	Creates a new terminal, very similar as if you had started it with
317	C<system $binfile, arg...>. Croaks (and probably outputs an error message)
318	if the new instance couldn't be created. Returns C<undef> if the new
319	instance didn't initialise perl, and the terminal object otherwise. The
320	C<init> and C<start> hooks will be called during the call.
321		409
322	=item urxvt::fatal $errormessage	410	=item urxvt::fatal $errormessage
323		411
324	Fatally aborts execution with the given error message. Avoid at all	412	Fatally aborts execution with the given error message. Avoid at all
325	costs! The only time this is acceptable is when the terminal process	413	costs! The only time this is acceptable is when the terminal process
…		…
331	newline. The module also overwrites the C<warn> builtin with a function	419	newline. The module also overwrites the C<warn> builtin with a function
332	that calls this function.	420	that calls this function.
333		421
334	Using this function has the advantage that its output ends up in the	422	Using this function has the advantage that its output ends up in the
335	correct place, e.g. on stderr of the connecting urxvtc client.	423	correct place, e.g. on stderr of the connecting urxvtc client.
		424
		425	Messages have a size limit of 1023 bytes currently.
		426
		427	=item $is_safe = urxvt::safe
		428
		429	Returns true when it is safe to do potentially unsafe things, such as
		430	evaluating perl code specified by the user. This is true when urxvt was
		431	started setuid or setgid.
336		432
337	=item $time = urxvt::NOW	433	=item $time = urxvt::NOW
338		434
339	Returns the "current time" (as per the event loop).	435	Returns the "current time" (as per the event loop).
340		436
…		…
379		475
380	=item $background = urxvt::GET_BASEBG $rend	476	=item $background = urxvt::GET_BASEBG $rend
381		477
382	Return the foreground/background colour index, respectively.	478	Return the foreground/background colour index, respectively.
383		479
384	=item $rend = urxvt::SET_FGCOLOR ($rend, $new_colour)	480	=item $rend = urxvt::SET_FGCOLOR $rend, $new_colour
385		481
386	=item $rend = urxvt::SET_BGCOLOR ($rend, $new_colour)	482	=item $rend = urxvt::SET_BGCOLOR $rend, $new_colour
387		483
388	Replace the foreground/background colour in the rendition mask with the	484	Replace the foreground/background colour in the rendition mask with the
389	specified one.	485	specified one.
390		486
391	=item $value = urxvt::GET_CUSTOM ($rend)	487	=item $value = urxvt::GET_CUSTOM $rend
392		488
393	Return the "custom" value: Every rendition has 5 bits for use by	489	Return the "custom" value: Every rendition has 5 bits for use by
394	extensions. They can be set and changed as you like and are initially	490	extensions. They can be set and changed as you like and are initially
395	zero.	491	zero.
396		492
397	=item $rend = urxvt::SET_CUSTOM ($rend, $new_value)	493	=item $rend = urxvt::SET_CUSTOM $rend, $new_value
398		494
399	Change the custom value.	495	Change the custom value.
400		496
401	=back	497	=back
402		498
403	=cut	499	=cut
404
405	package urxvt;
406
407	use utf8;
408	use strict;
409	use Scalar::Util ();
410	use List::Util ();
411
412	our $VERSION = 1;
413	our $TERM;
414	our @HOOKNAME;
415	our %OPTION;
416	our $LIBDIR;
417		500
418	BEGIN {	501	BEGIN {
419	urxvt->bootstrap;	502	urxvt->bootstrap;
420		503
421	# overwrite perl's warn	504	# overwrite perl's warn
…		…
423	my $msg = join "", @_;	506	my $msg = join "", @_;
424	$msg .= "\n"	507	$msg .= "\n"
425	unless $msg =~ /\n$/;	508	unless $msg =~ /\n$/;
426	urxvt::warn ($msg);	509	urxvt::warn ($msg);
427	};	510	};
		511
		512	# %ENV is the original startup environment
		513	delete $ENV{IFS};
		514	delete $ENV{CDPATH};
		515	delete $ENV{BASH_ENV};
		516	$ENV{PATH} = "/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/opt/bin:/opt/sbin";
428	}	517	}
429		518
430	my @hook_count;	519	my @hook_count;
431	my $verbosity = $ENV{URXVT_PERL_VERBOSITY};	520	my $verbosity = $ENV{URXVT_PERL_VERBOSITY};
432		521
433	sub verbose {	522	sub verbose {
434	my ($level, $msg) = @_;	523	my ($level, $msg) = @_;
435	warn "$msg\n" if $level <= $verbosity;	524	warn "$msg\n" if $level <= $verbosity;
436	}	525	}
437		526
438	# find on_xxx subs in the package and register them
439	# as hooks
440	sub register_package($) {
441	my ($pkg) = @_;
442
443	for my $htype (0.. $#HOOKNAME) {
444	my $name = $HOOKNAME[$htype];
445
446	my $ref = $pkg->can ("on_" . lc $name)
447	or next;
448
449	$TERM->{_hook}[$htype]{$pkg} = $ref;
450	$hook_count[$htype]++
451	or set_should_invoke $htype, 1;
452	}
453	}
454
455	my $extension_pkg = "extension0000";	527	my $extension_pkg = "extension0000";
456	my %extension_pkg;	528	my %extension_pkg;
457		529
458	# load a single script into its own package, once only	530	# load a single script into its own package, once only
459	sub extension_package($) {	531	sub extension_package($) {
…		…
465	verbose 3, "loading extension '$path' into package '$pkg'";	537	verbose 3, "loading extension '$path' into package '$pkg'";
466		538
467	open my $fh, "<:raw", $path	539	open my $fh, "<:raw", $path
468	or die "$path: $!";	540	or die "$path: $!";
469		541
		542	my $source = untaint
470	my $source = "package $pkg; use strict; use utf8;\n"	543	"package $pkg; use strict; use utf8;\n"
471	. "use base urxvt::term::proxy::;\n"	544	. "use base urxvt::term::extension::;\n"
472	. "#line 1 \"$path\"\n{\n"	545	. "#line 1 \"$path\"\n{\n"
473	. (do { local $/; <$fh> })	546	. (do { local $/; <$fh> })
474	. "\n};\n1";	547	. "\n};\n1";
475		548
476	$source =~ /(.*)/s and $source = $1; # untaint	549	eval $source
477
478	eval $source or die "$path: $@";	550	or die "$path: $@";
479		551
480	$pkg	552	$pkg
481	}	553	}
482	}	554	}
483		555
…		…
489	my $htype = shift;	561	my $htype = shift;
490		562
491	if ($htype == 0) { # INIT	563	if ($htype == 0) { # INIT
492	my @dirs = ((split /:/, $TERM->resource ("perl_lib")), "$LIBDIR/perl");	564	my @dirs = ((split /:/, $TERM->resource ("perl_lib")), "$LIBDIR/perl");
493		565
494	my %want_ext;	566	my %ext_arg;
495		567
496	for (map { split /,/, $TERM->resource ("perl_ext_$_") } 1, 2) {	568	for (map { split /,/, $TERM->resource ("perl_ext_$_") } 1, 2) {
497	if ($_ eq "default") {	569	if ($_ eq "default") {
498	$want_ext{$_}++ for qw(selection option-popup);	570	$ext_arg{$_} \|\|= [] for qw(selection option-popup selection-popup searchable-scrollback);
499	} elsif (/^-(.*)$/) {	571	} elsif (/^-(.*)$/) {
500	delete $want_ext{$1};	572	delete $ext_arg{$1};
		573	} elsif (/^([^<]+)<(.*)>$/) {
		574	push @{ $ext_arg{$1} }, $2;
501	} else {	575	} else {
502	$want_ext{$_}++;	576	$ext_arg{$_} \|\|= [];
503	}	577	}
504	}	578	}
505		579
506	for my $ext (keys %want_ext) {	580	while (my ($ext, $argv) = each %ext_arg) {
507	my @files = grep -f $_, map "$_/$ext", @dirs;	581	my @files = grep -f $_, map "$_/$ext", @dirs;
508		582
509	if (@files) {	583	if (@files) {
510	register_package extension_package $files[0];	584	$TERM->register_package (extension_package $files[0], $argv);
511	} else {	585	} else {
512	warn "perl extension '$ext' not found in perl library search path\n";	586	warn "perl extension '$ext' not found in perl library search path\n";
513	}	587	}
514	}	588	}
515		589
…		…
524	if $verbosity >= 10;	598	if $verbosity >= 10;
525		599
526	keys %$cb;	600	keys %$cb;
527		601
528	while (my ($pkg, $cb) = each %$cb) {	602	while (my ($pkg, $cb) = each %$cb) {
529	eval {	603	$retval = eval { $cb->($TERM->{_pkg}{$pkg}, @_) }
530	$retval = $cb->(
531	$TERM->{_pkg}{$pkg} \|\|= do {
532	my $proxy = bless { }, $pkg;
533	Scalar::Util::weaken ($proxy->{term} = $TERM);
534	$proxy
535	},
536	@_,
537	) and last;	604	and last;
538	};	605
539	if ($@) {	606	if ($@) {
540	$TERM->ungrab; # better to lose the grab than the session	607	$TERM->ungrab; # better to lose the grab than the session
541	warn $@;	608	warn $@;
542	}	609	}
543	}	610	}
		611
		612	verbose 11, "$HOOKNAME[$htype] returning <$retval>"
		613	if $verbosity >= 11;
544	}	614	}
545		615
546	if ($htype == 1) { # DESTROY	616	if ($htype == 1) { # DESTROY
547	# remove hooks if unused
548	if (my $hook = $TERM->{_hook}) {	617	if (my $hook = delete $TERM->{_hook}) {
549	for my $htype (0..$#$hook) {	618	for my $htype (0..$#$hook) {
550	$hook_count[$htype] -= scalar keys %{ $hook->[$htype] \|\| {} }	619	$hook_count[$htype] -= scalar keys %{ $hook->[$htype] \|\| {} }
551	or set_should_invoke $htype, 0;	620	or set_should_invoke $htype, 0;
552	}	621	}
553	}	622	}
…		…
560	}	629	}
561		630
562	$retval	631	$retval
563	}	632	}
564		633
565	# urxvt::term::proxy	634	sub exec_async(@) {
		635	my $pid = fork;
566		636
567	sub urxvt::term::proxy::AUTOLOAD {	637	return
568	$urxvt::term::proxy::AUTOLOAD =~ /:([^:]+)$/	638	if !defined $pid or $pid;
		639
		640	%ENV = %{ $TERM->env };
		641
		642	exec @_;
		643	_exit 255;
		644	}
		645
		646	# urxvt::term::extension
		647
		648	package urxvt::term::extension;
		649
		650	sub enable {
		651	my ($self, %hook) = @_;
		652	my $pkg = $self->{_pkg};
		653
		654	while (my ($name, $cb) = each %hook) {
		655	my $htype = $HOOKTYPE{uc $name};
		656	defined $htype
		657	or Carp::croak "unsupported hook type '$name'";
		658
		659	unless (exists $self->{term}{_hook}[$htype]{$pkg}) {
		660	$hook_count[$htype]++
		661	or urxvt::set_should_invoke $htype, 1;
		662	}
		663
		664	$self->{term}{_hook}[$htype]{$pkg} = $cb;
		665	}
		666	}
		667
		668	sub disable {
		669	my ($self, @hook) = @_;
		670	my $pkg = $self->{_pkg};
		671
		672	for my $name (@hook) {
		673	my $htype = $HOOKTYPE{uc $name};
		674	defined $htype
		675	or Carp::croak "unsupported hook type '$name'";
		676
		677	if (delete $self->{term}{_hook}[$htype]{$pkg}) {
		678	--$hook_count[$htype]
		679	or urxvt::set_should_invoke $htype, 0;
		680	}
		681	}
		682	}
		683
		684	our $AUTOLOAD;
		685
		686	sub AUTOLOAD {
		687	$AUTOLOAD =~ /:([^:]+)$/
569	or die "FATAL: \$AUTOLOAD '$urxvt::term::proxy::AUTOLOAD' unparsable";	688	or die "FATAL: \$AUTOLOAD '$AUTOLOAD' unparsable";
570		689
571	eval qq{	690	eval qq{
572	sub $urxvt::term::proxy::AUTOLOAD {	691	sub $AUTOLOAD {
573	my \$proxy = shift;	692	my \$proxy = shift;
574	\$proxy->{term}->$1 (\@_)	693	\$proxy->{term}->$1 (\@_)
575	}	694	}
576	1	695	1
577	} or die "FATAL: unable to compile method forwarder: $@";	696	} or die "FATAL: unable to compile method forwarder: $@";
578		697
579	goto &$urxvt::term::proxy::AUTOLOAD;	698	goto &$AUTOLOAD;
580	}	699	}
581		700
582	sub urxvt::term::proxy::DESTROY {	701	sub DESTROY {
583	# nop	702	# nop
584	}	703	}
585		704
586	# urxvt::destroy_hook	705	# urxvt::destroy_hook
587		706
…		…
597		716
598	=head2 The C<urxvt::anyevent> Class	717	=head2 The C<urxvt::anyevent> Class
599		718
600	The sole purpose of this class is to deliver an interface to the	719	The sole purpose of this class is to deliver an interface to the
601	C<AnyEvent> module - any module using it will work inside urxvt without	720	C<AnyEvent> module - any module using it will work inside urxvt without
602	further work. The only exception is that you cannot wait on condition	721	further programming. The only exception is that you cannot wait on
603	variables, but non-blocking condvar use is ok. What this means is that you	722	condition variables, but non-blocking condvar use is ok. What this means
604	cannot use blocking APIs, but the non-blocking variant should work.	723	is that you cannot use blocking APIs, but the non-blocking variant should
		724	work.
605		725
606	=cut	726	=cut
607		727
608	our $VERSION = 1;	728	our $VERSION = 1;
609		729
…		…
654	${$_[0]}++;	774	${$_[0]}++;
655	}	775	}
656		776
657	sub urxvt::anyevent::condvar::wait {	777	sub urxvt::anyevent::condvar::wait {
658	unless (${$_[0]}) {	778	unless (${$_[0]}) {
659	require Carp;
660	Carp::croak ("AnyEvent->condvar blocking wait unsupported in urxvt, use a non-blocking API");	779	Carp::croak "AnyEvent->condvar blocking wait unsupported in urxvt, use a non-blocking API";
661	}	780	}
662	}	781	}
663		782
664	package urxvt::term;	783	package urxvt::term;
665		784
666	=head2 The C<urxvt::term> Class	785	=head2 The C<urxvt::term> Class
667		786
668	=over 4	787	=over 4
669		788
		789	=cut
		790
		791	# find on_xxx subs in the package and register them
		792	# as hooks
		793	sub register_package {
		794	my ($self, $pkg, $argv) = @_;
		795
		796	my $proxy = bless {
		797	_pkg => $pkg,
		798	argv => $argv,
		799	}, $pkg;
		800	Scalar::Util::weaken ($proxy->{term} = $self);
		801
		802	$self->{_pkg}{$pkg} = $proxy;
		803
		804	for my $name (@HOOKNAME) {
		805	if (my $ref = $pkg->can ("on_" . lc $name)) {
		806	$proxy->enable ($name => $ref);
		807	}
		808	}
		809	}
		810
		811	=item $term = new urxvt::term $envhashref, $rxvtname, [arg...]
		812
		813	Creates a new terminal, very similar as if you had started it with system
		814	C<$rxvtname, arg...>. C<$envhashref> must be a reference to a C<%ENV>-like
		815	hash which defines the environment of the new terminal.
		816
		817	Croaks (and probably outputs an error message) if the new instance
		818	couldn't be created. Returns C<undef> if the new instance didn't
		819	initialise perl, and the terminal object otherwise. The C<init> and
		820	C<start> hooks will be called during this call.
		821
		822	=cut
		823
		824	sub new {
		825	my ($class, $env, @args) = @_;
		826
		827	_new ([ map "$_=$env->{$_}", keys %$env ], @args);
		828	}
		829
670	=item $term->destroy	830	=item $term->destroy
671		831
672	Destroy the terminal object (close the window, free resources etc.).	832	Destroy the terminal object (close the window, free resources
		833	etc.). Please note that @@RXVT_NAME@@ will not exit as long as any event
		834	watchers (timers, io watchers) are still active.
673		835
674	=item $isset = $term->option ($optval[, $set])	836	=item $isset = $term->option ($optval[, $set])
675		837
676	Returns true if the option specified by C<$optval> is enabled, and	838	Returns true if the option specified by C<$optval> is enabled, and
677	optionally change it. All option values are stored by name in the hash	839	optionally change it. All option values are stored by name in the hash
…		…
727	my ($self, $name) = (shift, shift);	889	my ($self, $name) = (shift, shift);
728	unshift @_, $self, $name, ($name =~ s/\s\+\s(\d+)$// ? $1 : 0);	890	unshift @_, $self, $name, ($name =~ s/\s\+\s(\d+)$// ? $1 : 0);
729	&urxvt::term::_resource	891	&urxvt::term::_resource
730	}	892	}
731		893
		894	=item $value = $term->x_resource ($pattern)
		895
		896	Returns the X-Resource for the given pattern, excluding the program or
		897	class name, i.e. C<< $term->x_resource ("boldFont") >> should return the
		898	same value as used by this instance of rxvt-unicode. Returns C<undef> if no
		899	resource with that pattern exists.
		900
		901	This method should only be called during the C<on_start> hook, as there is
		902	only one resource database per display, and later invocations might return
		903	the wrong resources.
		904
		905	=item $success = $term->parse_keysym ($keysym_spec, $command_string)
		906
		907	Adds a keymap translation exactly as specified via a resource. See the
		908	C<keysym> resource in the @@RXVT_NAME@@(1) manpage.
		909
732	=item $rend = $term->rstyle ([$new_rstyle])	910	=item $rend = $term->rstyle ([$new_rstyle])
733		911
734	Return and optionally change the current rendition. Text that is output by	912	Return and optionally change the current rendition. Text that is output by
735	the terminal application will use this style.	913	the terminal application will use this style.
736		914
…		…
746	=item ($row, $col) = $term->selection_end ([$row, $col])	924	=item ($row, $col) = $term->selection_end ([$row, $col])
747		925
748	Return the current values of the selection mark, begin or end positions,	926	Return the current values of the selection mark, begin or end positions,
749	and optionally set them to new values.	927	and optionally set them to new values.
750		928
		929	=item $term->selection_make ($eventtime[, $rectangular])
		930
		931	Tries to make a selection as set by C<selection_beg> and
		932	C<selection_end>. If C<$rectangular> is true (default: false), a
		933	rectangular selection will be made. This is the prefered function to make
		934	a selection.
		935
751	=item $success = $term->selection_grab ($eventtime)	936	=item $success = $term->selection_grab ($eventtime)
752		937
753	Try to request the primary selection from the server (for example, as set	938	Try to request the primary selection text from the server (for example, as
754	by the next method).	939	set by the next method). No visual feedback will be given. This function
		940	is mostly useful from within C<on_sel_grab> hooks.
755		941
756	=item $oldtext = $term->selection ([$newtext])	942	=item $oldtext = $term->selection ([$newtext])
757		943
758	Return the current selection text and optionally replace it by C<$newtext>.	944	Return the current selection text and optionally replace it by C<$newtext>.
759		945
760	#=item $term->overlay ($x, $y, $text)	946	=item $term->overlay_simple ($x, $y, $text)
761	#	947
762	#Create a simple multi-line overlay box. See the next method for details.	948	Create a simple multi-line overlay box. See the next method for details.
763	#	949
764	#=cut	950	=cut
765	#	951
766	#sub urxvt::term::scr_overlay {	952	sub overlay_simple {
767	# my ($self, $x, $y, $text) = @_;	953	my ($self, $x, $y, $text) = @_;
768	#	954
769	# my @lines = split /\n/, $text;	955	my @lines = split /\n/, $text;
770	#	956
771	# my $w = 0;	957	my $w = List::Util::max map $self->strwidth ($_), @lines;
772	# for (map $self->strwidth ($_), @lines) {	958
773	# $w = $_ if $w < $_;
774	# }
775	#
776	# $self->scr_overlay_new ($x, $y, $w, scalar @lines);	959	my $overlay = $self->overlay ($x, $y, $w, scalar @lines);
777	# $self->scr_overlay_set (0, $_, $lines[$_]) for 0.. $#lines;	960	$overlay->set (0, $_, $lines[$_]) for 0.. $#lines;
778	#}	961
		962	$overlay
		963	}
779		964
780	=item $term->overlay ($x, $y, $width, $height[, $rstyle[, $border]])	965	=item $term->overlay ($x, $y, $width, $height[, $rstyle[, $border]])
781		966
782	Create a new (empty) overlay at the given position with the given	967	Create a new (empty) overlay at the given position with the given
783	width/height. C<$rstyle> defines the initial rendition style	968	width/height. C<$rstyle> defines the initial rendition style
…		…
850		1035
851	=item $string = $term->locale_decode ($octets)	1036	=item $string = $term->locale_decode ($octets)
852		1037
853	Convert the given locale-encoded octets into a perl string.	1038	Convert the given locale-encoded octets into a perl string.
854		1039
		1040	=item $term->scr_xor_span ($beg_row, $beg_col, $end_row, $end_col[, $rstyle])
		1041
		1042	XORs the rendition values in the given span with the provided value
		1043	(default: C<RS_RVid>), which I<MUST NOT> contain font styles. Useful in
		1044	refresh hooks to provide effects similar to the selection.
		1045
		1046	=item $term->scr_xor_rect ($beg_row, $beg_col, $end_row, $end_col[, $rstyle1[, $rstyle2]])
		1047
		1048	Similar to C<scr_xor_span>, but xors a rectangle instead. Trailing
		1049	whitespace will additionally be xored with the C<$rstyle2>, which defaults
		1050	to C<RS_RVid \| RS_Uline>, which removes reverse video again and underlines
		1051	it instead. Both styles I<MUST NOT> contain font styles.
		1052
		1053	=item $term->scr_bell
		1054
		1055	Ring the bell!
		1056
855	=item $term->scr_add_lines ($string)	1057	=item $term->scr_add_lines ($string)
856		1058
857	Write the given text string to the screen, as if output by the application	1059	Write the given text string to the screen, as if output by the application
858	running inside the terminal. It may not contain command sequences (escape	1060	running inside the terminal. It may not contain command sequences (escape
859	codes), but is free to use line feeds, carriage returns and tabs. The	1061	codes), but is free to use line feeds, carriage returns and tabs. The
…		…
873		1075
874	Write the octets given in C<$data> to the tty (i.e. as program input). To	1076	Write the octets given in C<$data> to the tty (i.e. as program input). To
875	pass characters instead of octets, you should convert your strings first	1077	pass characters instead of octets, you should convert your strings first
876	to the locale-specific encoding using C<< $term->locale_encode >>.	1078	to the locale-specific encoding using C<< $term->locale_encode >>.
877		1079
		1080	=item $old_events = $term->pty_ev_events ([$new_events])
		1081
		1082	Replaces the event mask of the pty watcher by the given event mask. Can
		1083	be used to suppress input and output handling to the pty/tty. See the
		1084	description of C<< urxvt::timer->events >>. Make sure to always restore
		1085	the previous value.
		1086
878	=item $windowid = $term->parent	1087	=item $windowid = $term->parent
879		1088
880	Return the window id of the toplevel window.	1089	Return the window id of the toplevel window.
881		1090
882	=item $windowid = $term->vt	1091	=item $windowid = $term->vt
…		…
906	=item $nrow_plus_saveLines = $term->total_rows	1115	=item $nrow_plus_saveLines = $term->total_rows
907		1116
908	=item $lines_in_scrollback = $term->nsaved	1117	=item $lines_in_scrollback = $term->nsaved
909		1118
910	Return various integers describing terminal characteristics.	1119	Return various integers describing terminal characteristics.
		1120
		1121	=item $x_display = $term->display_id
		1122
		1123	Return the DISPLAY used by rxvt-unicode.
		1124
		1125	=item $lc_ctype = $term->locale
		1126
		1127	Returns the LC_CTYPE category string used by this rxvt-unicode.
		1128
		1129	=item $env = $term->env
		1130
		1131	Returns a copy of the environment in effect for the terminal as a hashref
		1132	similar to C<\%ENV>.
		1133
		1134	=cut
		1135
		1136	sub env {
		1137	if (my $env = $_[0]->_env) {
		1138	+{ map /^([^=]+)(?:=(.*))?$/s && ($1 => $2), @$env }
		1139	} else {
		1140	+{ %ENV }
		1141	}
		1142	}
911		1143
912	=item $modifiermask = $term->ModLevel3Mask	1144	=item $modifiermask = $term->ModLevel3Mask
913		1145
914	=item $modifiermask = $term->ModMetaMask	1146	=item $modifiermask = $term->ModMetaMask
915		1147
…		…
1008	Return the row number of the first/last row of the line, respectively.	1240	Return the row number of the first/last row of the line, respectively.
1009		1241
1010	=item $offset = $line->offset_of ($row, $col)	1242	=item $offset = $line->offset_of ($row, $col)
1011		1243
1012	Returns the character offset of the given row\|col pair within the logical	1244	Returns the character offset of the given row\|col pair within the logical
1013	line.	1245	line. Works for rows outside the line, too, and returns corresponding
		1246	offsets outside the string.
1014		1247
1015	=item ($row, $col) = $line->coord_of ($offset)	1248	=item ($row, $col) = $line->coord_of ($offset)
1016		1249
1017	Translates a string offset into terminal coordinates again.	1250	Translates a string offset into terminal coordinates again.
1018		1251
…		…
1092	$offset / $self->{ncol} + $self->{beg},	1325	$offset / $self->{ncol} + $self->{beg},
1093	$offset % $self->{ncol}	1326	$offset % $self->{ncol}
1094	)	1327	)
1095	}	1328	}
1096		1329
1097	=item ($row, $col) = $line->coord_of ($offset)
1098	=item $text = $term->special_encode $string	1330	=item $text = $term->special_encode $string
1099		1331
1100	Converts a perl string into the special encoding used by rxvt-unicode,	1332	Converts a perl string into the special encoding used by rxvt-unicode,
1101	where one character corresponds to one screen cell. See	1333	where one character corresponds to one screen cell. See
1102	C<< $term->ROW_t >> for details.	1334	C<< $term->ROW_t >> for details.
…		…
1104	=item $string = $term->special_decode $text	1336	=item $string = $term->special_decode $text
1105		1337
1106	Converts rxvt-unicodes text reprsentation into a perl string. See	1338	Converts rxvt-unicodes text reprsentation into a perl string. See
1107	C<< $term->ROW_t >> for details.	1339	C<< $term->ROW_t >> for details.
1108		1340
		1341	=item $success = $term->grab_button ($button, $modifiermask)
		1342
		1343	Registers a synchronous button grab. See the XGrabButton manpage.
		1344
		1345	=item $success = $term->grab ($eventtime[, $sync])
		1346
		1347	Calls XGrabPointer and XGrabKeyboard in asynchronous (default) or
		1348	synchronous (C<$sync> is true). Also remembers the grab timestampe.
		1349
		1350	=item $term->allow_events_async
		1351
		1352	Calls XAllowEvents with AsyncBoth for the most recent grab.
		1353
		1354	=item $term->allow_events_sync
		1355
		1356	Calls XAllowEvents with SyncBoth for the most recent grab.
		1357
		1358	=item $term->allow_events_replay
		1359
		1360	Calls XAllowEvents with both ReplayPointer and ReplayKeyboard for the most
		1361	recent grab.
		1362
		1363	=item $term->ungrab
		1364
		1365	Calls XUngrab for the most recent grab. Is called automatically on
		1366	evaluation errors, as it is better to lose the grab in the error case as
		1367	the session.
		1368
1109	=back	1369	=back
1110		1370
1111	=cut	1371	=cut
1112		1372
1113	package urxvt::popup;	1373	package urxvt::popup;
…		…
1128	$item->{render} \|\|= sub { $_[0]{text} };	1388	$item->{render} \|\|= sub { $_[0]{text} };
1129		1389
1130	push @{ $self->{item} }, $item;	1390	push @{ $self->{item} }, $item;
1131	}	1391	}
1132		1392
1133	sub add_separator {	1393	=item $popup->add_title ($title)
1134	my ($self, $sep) = @_;
1135		1394
1136	$sep \|\|= "═";	1395	Adds a non-clickable title to the popup.
1137		1396
1138	$self->add_item ({	1397	=cut
1139	rend => { normal => "\x1b[0;30;47m", hover => "\x1b[0;30;47m", active => "\x1b[0;30;47m" },
1140	text => "",
1141	render => sub { $sep x $urxvt::TERM->ncol },
1142	activate => sub { },
1143	});
1144	}
1145		1398
1146	sub add_title {	1399	sub add_title {
1147	my ($self, $title) = @_;	1400	my ($self, $title) = @_;
1148		1401
1149	$self->add_item ({	1402	$self->add_item ({
…		…
1151	text => $title,	1404	text => $title,
1152	activate => sub { },	1405	activate => sub { },
1153	});	1406	});
1154	}	1407	}
1155		1408
		1409	=item $popup->add_separator ([$sepchr])
		1410
		1411	Creates a separator, optionally using the character given as C<$sepchr>.
		1412
		1413	=cut
		1414
		1415	sub add_separator {
		1416	my ($self, $sep) = @_;
		1417
		1418	$sep \|\|= "=";
		1419
		1420	$self->add_item ({
		1421	rend => { normal => "\x1b[0;30;47m", hover => "\x1b[0;30;47m", active => "\x1b[0;30;47m" },
		1422	text => "",
		1423	render => sub { $sep x $self->{term}->ncol },
		1424	activate => sub { },
		1425	});
		1426	}
		1427
		1428	=item $popup->add_button ($text, $cb)
		1429
		1430	Adds a clickable button to the popup. C<$cb> is called whenever it is
		1431	selected.
		1432
		1433	=cut
		1434
1156	sub add_button {	1435	sub add_button {
1157	my ($self, $text, $cb) = @_;	1436	my ($self, $text, $cb) = @_;
1158		1437
1159	$self->add_item ({ type => "button", text => "[ $text ]", activate => $cb});	1438	$self->add_item ({ type => "button", text => $text, activate => $cb});
1160	}	1439	}
		1440
		1441	=item $popup->add_toggle ($text, $cb, $initial_value)
		1442
		1443	Adds a toggle/checkbox item to the popup. Teh callback gets called
		1444	whenever it gets toggled, with a boolean indicating its value as its first
		1445	argument.
		1446
		1447	=cut
1161		1448
1162	sub add_toggle {	1449	sub add_toggle {
1163	my ($self, $text, $cb, $value) = @_;	1450	my ($self, $text, $cb, $value) = @_;
1164		1451
1165	my $item; $item = {	1452	my $item; $item = {
1166	type => "button",	1453	type => "button",
1167	text => " $text",	1454	text => " $text",
1168	value => $value,	1455	value => $value,
1169	render => sub { ($_[0]{value} ? "* " : " ") . $text },	1456	render => sub { ($_[0]{value} ? "* " : " ") . $text },
1170	activate => sub { $cb->($_[0]{value} = !$_[0]{value}); },	1457	activate => sub { $cb->($_[1]{value} = !$_[1]{value}); },
1171	};	1458	};
1172		1459
1173	$self->add_item ($item);	1460	$self->add_item ($item);
1174	}	1461	}
		1462
		1463	=item $popup->show
		1464
		1465	Displays the popup (which is initially hidden).
		1466
		1467	=cut
1175		1468
1176	sub show {	1469	sub show {
1177	my ($self) = @_;	1470	my ($self) = @_;
1178		1471
1179	local $urxvt::popup::self = $self;	1472	local $urxvt::popup::self = $self;
1180		1473
		1474	my $env = $self->{term}->env;
		1475	# we can't hope to reproduce the locale algorithm, so nuke LC_ALL and set LC_CTYPE.
		1476	delete $env->{LC_ALL};
		1477	$env->{LC_CTYPE} = $self->{term}->locale;
		1478
		1479	urxvt::term->new ($env, $self->{term}->resource ("name"),
1181	urxvt->new ("--perl-lib" => "", "--perl-ext-common" => "", "-pty-fd" => -1, "-sl" => 0, "-b" => 0,	1480	"--perl-lib" => "", "--perl-ext-common" => "", "-pty-fd" => -1, "-sl" => 0, "-b" => 0,
1182	"--transient-for" => $self->{term}->parent,	1481	"--transient-for" => $self->{term}->parent,
		1482	"-display" => $self->{term}->display_id,
1183	"-pe" => "urxvt-popup")	1483	"-pe" => "urxvt-popup")
1184	or die "unable to create popup window\n";	1484	or die "unable to create popup window\n";
1185	}	1485	}
1186		1486
1187	sub DESTROY {	1487	sub DESTROY {
1188	my ($self) = @_;	1488	my ($self) = @_;
1189		1489
1190	delete $self->{term}{_destroy}{$self};	1490	delete $self->{term}{_destroy}{$self};
1191	$self->{term}->ungrab;	1491	$self->{term}->ungrab;
1192	}	1492	}
		1493
		1494	=back
1193		1495
1194	=head2 The C<urxvt::timer> Class	1496	=head2 The C<urxvt::timer> Class
1195		1497
1196	This class implements timer watchers/events. Time is represented as a	1498	This class implements timer watchers/events. Time is represented as a
1197	fractional number of seconds since the epoch. Example:	1499	fractional number of seconds since the epoch. Example:
…		…
1250		1552
1251	$term->{socket} = ...	1553	$term->{socket} = ...
1252	$term->{iow} = urxvt::iow	1554	$term->{iow} = urxvt::iow
1253	->new	1555	->new
1254	->fd (fileno $term->{socket})	1556	->fd (fileno $term->{socket})
1255	->events (1) # wait for read data	1557	->events (urxvt::EVENT_READ)
1256	->start	1558	->start
1257	->cb (sub {	1559	->cb (sub {
1258	my ($iow, $revents) = @_;	1560	my ($iow, $revents) = @_;
1259	# $revents must be 1 here, no need to check	1561	# $revents must be 1 here, no need to check
1260	sysread $term->{socket}, my $buf, 8192	1562	sysread $term->{socket}, my $buf, 8192
…		…
1277		1579
1278	Set the filedescriptor (not handle) to watch.	1580	Set the filedescriptor (not handle) to watch.
1279		1581
1280	=item $iow = $iow->events ($eventmask)	1582	=item $iow = $iow->events ($eventmask)
1281		1583
1282	Set the event mask to watch. Bit #0 (value C<1>) enables watching for read	1584	Set the event mask to watch. The only allowed values are
1283	data, Bit #1 (value C<2>) enables watching for write data.	1585	C<urxvt::EVENT_READ> and C<urxvt::EVENT_WRITE>, which might be ORed
		1586	together, or C<urxvt::EVENT_NONE>.
1284		1587
1285	=item $iow = $iow->start	1588	=item $iow = $iow->start
1286		1589
1287	Start watching for requested events on the given handle.	1590	Start watching for requested events on the given handle.
1288		1591
…		…
1303		1606
1304	=item == 0 - fatal messages	1607	=item == 0 - fatal messages
1305		1608
1306	=item >= 3 - script loading and management	1609	=item >= 3 - script loading and management
1307		1610
1308	=item >=10 - all events received	1611	=item >=10 - all called hooks
		1612
		1613	=item >=11 - hook reutrn values
1309		1614
1310	=back	1615	=back
1311		1616
1312	=head1 AUTHOR	1617	=head1 AUTHOR
1313		1618

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Comparing rxvt-unicode/src/urxvt.pm (file contents): Revision 1.58 by root, Sun Jan 8 22:58:13 2006 UTC vs. Revision 1.87 by root, Thu Jan 12 05:37:34 2006 UTC

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Comparing rxvt-unicode/src/urxvt.pm (file contents):
Revision 1.58 by root, Sun Jan 8 22:58:13 2006 UTC vs.
Revision 1.87 by root, Thu Jan 12 05:37:34 2006 UTC