rxvt-unicode/src/urxvt.pm

=head1 NAME

rxvtperl - 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 @@RXVT_NAME@@ using it:

   @@RXVT_NAME@@ --perl-lib $HOME -pe grab_test

=head1 DESCRIPTION

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

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

Each script will only ever be loaded once, even in @@RXVT_NAME@@d, where
scripts will be shared (But not enabled) for all terminals.

=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 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.

=head2 Hooks

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

All of them must return a boolean value. If it is true, then the event
counts as being I<consumed>, and the invocation of other hooks is skipped,
and the relevant action might not be carried out by the C++ code.

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.

=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_start $term

Called at the very end of initialisation of a new terminal, just before
returning to the mainloop.

=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 hilighted.

=item on_focus_in $term

Called whenever the window gets the keyboard focus, before urxvt does
focus in processing.

=item on_focus_out $term

Called wheneever the window loses keyboard focus, before urxvt does focus
out processing.

=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_tty_activity $term *NYI*

Called whenever the program(s) running in the urxvt window send output.

=item on_refresh_begin $term

Called just before the screen gets redrawn. Can be used for overlay
or similar effects by modify 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>.

=back

=head2 Functions in the C<urxvt> Package

=over 4

=item urxvt::fatal $errormessage

Fatally aborts execution with the given error message. Avoid at all
costs! The only time this is acceptable is when the terminal process
starts up.

=item urxvt::warn $string

Calls C<rxvt_warn> with the given string which should not include a
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.

=item $time = urxvt::NOW

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

=cut

package urxvt;

use strict;

our $term;
our @HOOKNAME;
our $LIBDIR;

BEGIN {
   urxvt->bootstrap;

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

my @hook_count;
my $verbosity = $ENV{URXVT_PERL_VERBOSITY};

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

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

   for my $htype (0.. $#HOOKNAME) {
      my $name = $HOOKNAME[$htype];

      my $ref = $pkg->can ("on_" . lc $name)
         or next;

      $term->{_hook}[$htype]{$ref*1} = $ref;
      $hook_count[$htype]++
         or set_should_invoke $htype, 1;
   }
}

my $script_pkg = "script0000";
my %script_pkg;

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

   $script_pkg{$path} ||= do {
      my $pkg = "urxvt::" . ($script_pkg++);

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

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

      my $source = "package $pkg; use strict; use utf8;\n"
                   . "#line 1 \"$path\"\n{\n"
                   . (do { local $/; <$fh> })
                   . "\n};\n1";

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

      $pkg
   }
}

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

   if ($htype == 0) { # INIT
      my @dirs = ((split /:/, $term->resource ("perl_lib")), "$LIBDIR/perl");

      for my $ext (split /:/, $term->resource ("perl_ext")) {
         my @files = grep -f $_, map "$_/$ext", @dirs;

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

   } elsif ($htype == 1) { # DESTROY
      if (my $hook = $term->{_hook}) {
         for my $htype (0..$#$hook) {
            $hook_count[$htype] -= scalar keys %{ $hook->[$htype] || {} }
               or set_should_invoke $htype, 0;
         }
      }
   }

   my $cb = $term->{_hook}[$htype]
      or return;

   verbose 10, "$HOOKNAME[$htype] (" . (join ", ", $term, @_) . ")"
      if $verbosity >= 10;

   while (my ($k, $v) = each %$cb) {
      return 1 if $v->($term, @_);
   }

   0
}

=back

=head2 The C<urxvt::term> Class

=over 4

=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 a likely non-exhaustive list of resource names, not all of which
are supported in every build, please see the source to see the actual
list:

  answerbackstring backgroundPixmap backspace_key boldFont boldItalicFont
  borderLess color cursorBlink cursorUnderline cutchars delete_key
  display_name embed ext_bwidth fade font geometry hold iconName
  imFont imLocale inputMethod insecure int_bwidth intensityStyles
  italicFont jumpScroll lineSpace loginShell mapAlert menu meta8 modifier
  mouseWheelScrollPage name pastableTabs path perl_eval perl_ext
  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 selectstyle
  shade term_name title transparent transparent_all tripleclickwords
  utmpInhibit visualBell

=cut

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

=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,
and optionally set them to new values.

=item $success = $term->selection_grab ($eventtime)

Try to request the primary selection from the server (for example, as set
by the next method).

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

Return the current selection text and optionally replace it by C<$newtext>.

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

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

=cut

sub urxvt::term::scr_overlay {
   my ($self, $x, $y, $text) = @_;

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

   my $w = 0;
   for (map $self->strwidth ($_), @lines) {
      $w = $_ if $w < $_;
   }

   $self->scr_overlay_new ($x, $y, $w, scalar @lines);
   $self->scr_overlay_set (0, $_, $lines[$_]) for 0.. $#lines;
}

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

Create a new (empty) overlay at the given position with the given
width/height. A 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.

=item $term->scr_overlay_off

Switch the overlay off again.

=item $term->scr_overlay_set_char ($x, $y, $char, $rend = OVERLAY_RSTYLE)

Put a single character (specified numerically) at the given overlay
position.

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

Write a string at the given position into the overlay.

=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 $term->tt_write ($octets)

Write the octets given in C<$data> to the tty (i.e. as program input). To
pass characters instead of octets, you should convetr you strings first to
the locale-specific encoding using C<< $term->locale_encode >>.

=back

=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:

   # create a digital clock display in upper right corner
   $term->{timer} = urxvt::timer
                    ->new
                    ->start (urxvt::NOW)
                    ->cb (sub {
                       my ($timer) = @_;
                       my $time = $timer->at;
                       $timer->start ($time + 1);
                       $self->scr_overlay (-1, 0, 
                          POSIX::strftime "%H:%M:%S", localtime $time);
                    });

=over 4

=item $timer = new urxvt::timer

Create a new timer object in stopped state.

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

Set the callback to be called when the timer triggers.

=item $tstamp = $timer->at

Return the time this watcher will fire next.

=item $timer = $timer->set ($tstamp)

Set the time the event is generated to $tstamp.

=item $timer = $timer->start

Start the timer.

=item $timer = $timer->start ($tstamp)

Set the event trigger time to C<$tstamp> and start the timer.

=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 $term->{socket})
                 ->events (1) # wait for read data
                 ->start
                 ->cb (sub {
                   my ($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 filedescriptor (not handle) to watch.

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

Set the event mask to watch. Bit #0 (value C<1>) enables watching for read
data, Bit #1 (value C<2>) enables watching for write data.

=item $iow = $iow->start

Start watching for requested events on the given handle.

=item $iow = $iow->stop

Stop watching for events on the given filehandle.

=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 - only fatal messages

=item 3 - script loading and management

=item 10 - all events received

=back

=head1 AUTHOR

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

=cut

1
Revision:	1.10
Committed:	Mon Jan 2 20:47:52 2006 UTC (18 years, 4 months ago) by root
Branch:	MAIN
Changes since 1.9:	+8 -6 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	=head1 NAME
2
3	root	1.3	rxvtperl - rxvt-unicode's embedded perl interpreter
4	root	1.1
5			=head1 SYNOPSIS
6
7	root	1.10	# create a file grab_test in $HOME:
8	root	1.1
9			sub on_sel_grab {
10			warn "you selected ", $_[0]->selection;
11	root	1.3	()
12	root	1.1	}
13
14	root	1.10	# start a @@RXVT_NAME@@ using it:
15
16			@@RXVT_NAME@@ --perl-lib $HOME -pe grab_test
17	root	1.1
18			=head1 DESCRIPTION
19
20	root	1.8	Everytime a terminal object gets created, scripts specified via the
21	root	1.10	C<perl> resource are loaded and associated with it.
22
23			Scripts are compiled in a 'use strict' and 'use utf8' environment, and
24			thus must be encoded as UTF-8.
25	root	1.6
26			Each script will only ever be loaded once, even in @@RXVT_NAME@@d, where
27	root	1.8	scripts will be shared (But not enabled) for all terminals.
28	root	1.6
29			=head2 General API Considerations
30
31			All objects (such as terminals, time watchers etc.) are typical
32			reference-to-hash objects. The hash can be used to store anything you
33	root	1.7	like. All members starting with an underscore (such as C<_ptr> or
34			C<_hook>) are reserved for internal uses and must not be accessed or
35			modified).
36	root	1.6
37			When objects are destroyed on the C++ side, the perl object hashes are
38			emptied, so its best to store related objects such as time watchers and
39			the like inside the terminal object so they get destroyed as soon as the
40			terminal is destroyed.
41
42	root	1.1	=head2 Hooks
43
44			The following subroutines can be declared in loaded scripts, and will be called
45			whenever the relevant event happens.
46
47			All of them must return a boolean value. If it is true, then the event
48			counts as being I<consumed>, and the invocation of other hooks is skipped,
49			and the relevant action might not be carried out by the C++ code.
50
51			When in doubt, return a false value (preferably C<()>).
52
53			=over 4
54
55			=item on_init $term
56
57			Called after a new terminal object has been initialized, but before
58			windows are created or the command gets run.
59
60			=item on_reset $term
61
62			Called after the screen is "reset" for any reason, such as resizing or
63			control sequences. Here is where you can react on changes to size-related
64			variables.
65
66			=item on_start $term
67
68			Called at the very end of initialisation of a new terminal, just before
69			returning to the mainloop.
70
71			=item on_sel_make $term, $eventtime
72
73			Called whenever a selection has been made by the user, but before the
74			selection text is copied, so changes to the beginning, end or type of the
75			selection will be honored.
76
77			Returning a true value aborts selection making by urxvt, in which case you
78			have to make a selection yourself by calling C<< $term->selection_grab >>.
79
80			=item on_sel_grab $term, $eventtime
81
82			Called whenever a selection has been copied, but before the selection is
83			requested from the server. The selection text can be queried and changed
84			by calling C<< $term->selection >>.
85
86			Returning a true value aborts selection grabbing. It will still be hilighted.
87
88			=item on_focus_in $term
89
90			Called whenever the window gets the keyboard focus, before urxvt does
91			focus in processing.
92
93			=item on_focus_out $term
94
95			Called wheneever the window loses keyboard focus, before urxvt does focus
96			out processing.
97
98			=item on_view_change $term, $offset
99
100			Called whenever the view offset changes, i..e the user or program
101			scrolls. Offset C<0> means display the normal terminal, positive values
102			show this many lines of scrollback.
103
104			=item on_scroll_back $term, $lines, $saved
105
106			Called whenever lines scroll out of the terminal area into the scrollback
107			buffer. C<$lines> is the number of lines scrolled out and may be larger
108			than the scroll back buffer or the terminal.
109
110			It is called before lines are scrolled out (so rows 0 .. min ($lines - 1,
111			$nrow - 1) represent the lines to be scrolled out). C<$saved> is the total
112			number of lines that will be in the scrollback buffer.
113
114			=item on_tty_activity $term NYI
115
116			Called whenever the program(s) running in the urxvt window send output.
117
118			=item on_refresh_begin $term
119
120			Called just before the screen gets redrawn. Can be used for overlay
121			or similar effects by modify terminal contents in refresh_begin, and
122			restoring them in refresh_end. The built-in overlay and selection display
123			code is run after this hook, and takes precedence.
124
125			=item on_refresh_end $term
126
127			Called just after the screen gets redrawn. See C<on_refresh_begin>.
128
129			=back
130
131			=head2 Functions in the C<urxvt> Package
132
133			=over 4
134
135			=item urxvt::fatal $errormessage
136
137			Fatally aborts execution with the given error message. Avoid at all
138			costs! The only time this is acceptable is when the terminal process
139			starts up.
140
141			=item urxvt::warn $string
142
143	root	1.6	Calls C<rxvt_warn> with the given string which should not include a
144	root	1.1	newline. The module also overwrites the C<warn> builtin with a function
145			that calls this function.
146
147			Using this function has the advantage that its output ends up in the
148			correct place, e.g. on stderr of the connecting urxvtc client.
149
150			=item $time = urxvt::NOW
151
152			Returns the "current time" (as per the event loop).
153
154			=cut
155
156			package urxvt;
157
158			use strict;
159
160			our $term;
161			our @HOOKNAME;
162			our $LIBDIR;
163
164			BEGIN {
165			urxvt->bootstrap;
166
167			# overwrite perl's warn
168			*CORE::GLOBAL::warn = sub {
169			my $msg = join "", @_;
170			$msg .= "\n"
171			unless $msg =~ /\n$/;
172			urxvt::warn ($msg);
173			};
174			}
175
176	root	1.8	my @hook_count;
177	root	1.7	my $verbosity = $ENV{URXVT_PERL_VERBOSITY};
178	root	1.1
179			sub verbose {
180			my ($level, $msg) = @_;
181	root	1.8	warn "$msg\n" if $level <= $verbosity;
182	root	1.1	}
183
184			# find on_xxx subs in the package and register them
185			# as hooks
186			sub register_package($) {
187			my ($pkg) = @_;
188
189	root	1.7	for my $htype (0.. $#HOOKNAME) {
190			my $name = $HOOKNAME[$htype];
191	root	1.1
192			my $ref = $pkg->can ("on_" . lc $name)
193			or next;
194
195	root	1.7	$term->{_hook}[$htype]{$ref*1} = $ref;
196			$hook_count[$htype]++
197			or set_should_invoke $htype, 1;
198	root	1.1	}
199			}
200
201			my $script_pkg = "script0000";
202			my %script_pkg;
203
204			# load a single script into its own package, once only
205	root	1.7	sub script_package($) {
206	root	1.1	my ($path) = @_;
207
208			$script_pkg{$path} \|\|= do {
209	root	1.8	my $pkg = "urxvt::" . ($script_pkg++);
210
211	root	1.1	verbose 3, "loading script '$path' into package '$pkg'";
212
213			open my $fh, "<:raw", $path
214			or die "$path: $!";
215
216	root	1.8	my $source = "package $pkg; use strict; use utf8;\n"
217			. "#line 1 \"$path\"\n{\n"
218			. (do { local $/; <$fh> })
219			. "\n};\n1";
220
221			eval $source or die "$path: $@";
222	root	1.1
223			$pkg
224	root	1.7	}
225	root	1.1	}
226
227	root	1.8	# called by the rxvt core
228			sub invoke {
229			local $term = shift;
230			my $htype = shift;
231	root	1.6
232	root	1.8	if ($htype == 0) { # INIT
233	root	1.9	my @dirs = ((split /:/, $term->resource ("perl_lib")), "$LIBDIR/perl");
234	root	1.6
235	root	1.8	for my $ext (split /:/, $term->resource ("perl_ext")) {
236			my @files = grep -f $_, map "$_/$ext", @dirs;
237	root	1.6
238	root	1.8	if (@files) {
239			register_package script_package $files[0];
240			} else {
241			warn "perl extension '$ext' not found in perl library search path\n";
242			}
243			}
244	root	1.6
245	root	1.8	} elsif ($htype == 1) { # DESTROY
246			if (my $hook = $term->{_hook}) {
247			for my $htype (0..$#$hook) {
248			$hook_count[$htype] -= scalar keys %{ $hook->[$htype] \|\| {} }
249			or set_should_invoke $htype, 0;
250			}
251			}
252			}
253	root	1.6
254	root	1.8	my $cb = $term->{_hook}[$htype]
255			or return;
256	root	1.6
257	root	1.8	verbose 10, "$HOOKNAME[$htype] (" . (join ", ", $term, @_) . ")"
258			if $verbosity >= 10;
259	root	1.7
260	root	1.8	while (my ($k, $v) = each %$cb) {
261			return 1 if $v->($term, @_);
262	root	1.7	}
263
264	root	1.8	0
265	root	1.7	}
266	root	1.1
267			=back
268
269			=head2 The C<urxvt::term> Class
270
271			=over 4
272
273	root	1.4	=item $value = $term->resource ($name[, $newval])
274
275			Returns the current resource value associated with a given name and
276			optionally sets a new value. Setting values is most useful in the C<init>
277			hook. Unset resources are returned and accepted as C<undef>.
278
279			The new value must be properly encoded to a suitable character encoding
280			before passing it to this method. Similarly, the returned value may need
281			to be converted from the used encoding to text.
282
283			Resource names are as defined in F<src/rsinc.h>. Colours can be specified
284			as resource names of the form C<< color+<index> >>, e.g. C<color+5>. (will
285			likely change).
286
287			Please note that resource strings will currently only be freed when the
288			terminal is destroyed, so changing options frequently will eat memory.
289
290	root	1.5	Here is a a likely non-exhaustive list of resource names, not all of which
291			are supported in every build, please see the source to see the actual
292			list:
293
294			answerbackstring backgroundPixmap backspace_key boldFont boldItalicFont
295			borderLess color cursorBlink cursorUnderline cutchars delete_key
296			display_name embed ext_bwidth fade font geometry hold iconName
297			imFont imLocale inputMethod insecure int_bwidth intensityStyles
298	root	1.8	italicFont jumpScroll lineSpace loginShell mapAlert menu meta8 modifier
299			mouseWheelScrollPage name pastableTabs path perl_eval perl_ext
300	root	1.6	perl_lib pointerBlank pointerBlankDelay preeditType print_pipe pty_fd
301			reverseVideo saveLines scrollBar scrollBar_align scrollBar_floating
302			scrollBar_right scrollBar_thickness scrollTtyKeypress scrollTtyOutput
303			scrollWithBuffer scrollstyle secondaryScreen secondaryScroll selectstyle
304			shade term_name title transparent transparent_all tripleclickwords
305			utmpInhibit visualBell
306	root	1.5
307	root	1.4	=cut
308
309			sub urxvt::term::resource($$;$) {
310			my ($self, $name) = (shift, shift);
311			unshift @_, $self, $name, ($name =~ s/\s\+\s(\d+)$// ? $1 : 0);
312			goto &urxvt::term::_resource;
313			}
314
315	root	1.1	=item ($row, $col) = $term->selection_mark ([$row, $col])
316
317			=item ($row, $col) = $term->selection_beg ([$row, $col])
318
319			=item ($row, $col) = $term->selection_end ([$row, $col])
320
321			Return the current values of the selection mark, begin or end positions,
322			and optionally set them to new values.
323
324			=item $success = $term->selection_grab ($eventtime)
325
326			Try to request the primary selection from the server (for example, as set
327			by the next method).
328
329			=item $oldtext = $term->selection ([$newtext])
330
331			Return the current selection text and optionally replace it by C<$newtext>.
332
333			=item $term->scr_overlay ($x, $y, $text)
334
335			Create a simple multi-line overlay box. See the next method for details.
336
337			=cut
338
339			sub urxvt::term::scr_overlay {
340			my ($self, $x, $y, $text) = @_;
341
342			my @lines = split /\n/, $text;
343
344			my $w = 0;
345	root	1.6	for (map $self->strwidth ($_), @lines) {
346	root	1.1	$w = $_ if $w < $_;
347			}
348
349			$self->scr_overlay_new ($x, $y, $w, scalar @lines);
350			$self->scr_overlay_set (0, $_, $lines[$_]) for 0.. $#lines;
351			}
352
353			=item $term->scr_overlay_new ($x, $y, $width, $height)
354
355			Create a new (empty) overlay at the given position with the given
356			width/height. A border will be put around the box. If either C<$x> or
357			C<$y> is negative, then this is counted from the right/bottom side,
358			respectively.
359
360			=item $term->scr_overlay_off
361
362			Switch the overlay off again.
363
364			=item $term->scr_overlay_set_char ($x, $y, $char, $rend = OVERLAY_RSTYLE)
365
366			Put a single character (specified numerically) at the given overlay
367			position.
368
369			=item $term->scr_overlay_set ($x, $y, $text)
370
371			Write a string at the given position into the overlay.
372
373	root	1.6	=item $cellwidth = $term->strwidth $string
374
375			Returns the number of screen-cells this string would need. Correctly
376			accounts for wide and combining characters.
377
378			=item $octets = $term->locale_encode $string
379
380			Convert the given text string into the corresponding locale encoding.
381
382			=item $string = $term->locale_decode $octets
383
384			Convert the given locale-encoded octets into a perl string.
385
386			=item $term->tt_write ($octets)
387
388			Write the octets given in C<$data> to the tty (i.e. as program input). To
389			pass characters instead of octets, you should convetr you strings first to
390			the locale-specific encoding using C<< $term->locale_encode >>.
391
392	root	1.1	=back
393
394			=head2 The C<urxvt::timer> Class
395
396			This class implements timer watchers/events. Time is represented as a
397			fractional number of seconds since the epoch. Example:
398
399			# create a digital clock display in upper right corner
400			$term->{timer} = urxvt::timer
401			->new
402			->start (urxvt::NOW)
403			->cb (sub {
404			my ($timer) = @_;
405			my $time = $timer->at;
406			$timer->start ($time + 1);
407			$self->scr_overlay (-1, 0,
408			POSIX::strftime "%H:%M:%S", localtime $time);
409			});
410
411			=over 4
412
413			=item $timer = new urxvt::timer
414
415			Create a new timer object in stopped state.
416
417			=item $timer = $timer->cb (sub { my ($timer) = @_; ... })
418
419			Set the callback to be called when the timer triggers.
420
421			=item $tstamp = $timer->at
422
423			Return the time this watcher will fire next.
424
425			=item $timer = $timer->set ($tstamp)
426
427			Set the time the event is generated to $tstamp.
428
429			=item $timer = $timer->start
430
431			Start the timer.
432
433			=item $timer = $timer->start ($tstamp)
434
435			Set the event trigger time to C<$tstamp> and start the timer.
436
437			=item $timer = $timer->stop
438
439			Stop the timer.
440
441			=back
442
443			=head2 The C<urxvt::iow> Class
444
445			This class implements io watchers/events. Example:
446
447			$term->{socket} = ...
448			$term->{iow} = urxvt::iow
449			->new
450			->fd (fileno $term->{socket})
451			->events (1) # wait for read data
452			->start
453			->cb (sub {
454			my ($iow, $revents) = @_;
455			# $revents must be 1 here, no need to check
456			sysread $term->{socket}, my $buf, 8192
457			or end-of-file;
458			});
459
460
461			=over 4
462
463			=item $iow = new urxvt::iow
464
465			Create a new io watcher object in stopped state.
466
467			=item $iow = $iow->cb (sub { my ($iow, $reventmask) = @_; ... })
468
469			Set the callback to be called when io events are triggered. C<$reventmask>
470			is a bitset as described in the C<events> method.
471
472			=item $iow = $iow->fd ($fd)
473
474			Set the filedescriptor (not handle) to watch.
475
476			=item $iow = $iow->events ($eventmask)
477
478			Set the event mask to watch. Bit #0 (value C<1>) enables watching for read
479			data, Bit #1 (value C<2>) enables watching for write data.
480
481			=item $iow = $iow->start
482
483			Start watching for requested events on the given handle.
484
485			=item $iow = $iow->stop
486
487			Stop watching for events on the given filehandle.
488
489			=back
490
491	root	1.4	=head1 ENVIRONMENT
492
493			=head2 URXVT_PERL_VERBOSITY
494
495			This variable controls the verbosity level of the perl extension. Higher
496			numbers indicate more verbose output.
497
498			=over 4
499
500			=item 0 - only fatal messages
501
502			=item 3 - script loading and management
503
504			=item 10 - all events received
505
506			=back
507
508	root	1.1	=head1 AUTHOR
509
510			Marc Lehmann <pcg@goof.com>
511			http://software.schmorp.de/pkg/rxvt-unicode
512
513			=cut
514
515			1