rxvt-unicode/src/urxvt.pm

=head1 NAME

@@RXVT_NAME@@perl - 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>.

=item on_keyboard_command $term, $string

Called whenever the user presses a key combination that has a
C<perl:string> action bound to it (see description of the B<keysym>
resource in the @@RXVT_NAME@@(1) manpage).

=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 convert your strings first
to the locale-specific encoding using C<< $term->locale_encode >>.

=item $nrow = $term->nrow

=item $ncol = $term->ncol

Return the number of rows/columns of the terminal window (i.e. as
specified by C<-geometry>, excluding any scrollback).

=item $nsaved = $term->nsaved

Returns the number of lines in the scrollback buffer.

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

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

=item $term->want_refresh

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

Used after changing terminal contents to display them.

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

Returns the text of the entire row with number C<$row_number>. Row C<0>
is the topmost terminal line, row C<< $term->$ncol-1 >> is the bottommost
terminal line. The scrollback buffer starts at line C<-1> and extends to
line C<< -$term->nsaved >>.

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

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

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

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

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

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

When setting rendition, the font mask will be ignored.

See the section on RENDITION, below.

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

Returns the number of screen cells that are in use ("the line length"). If
it is C<-1>, then the line is part of a multiple-row logical "line", which
means all characters are in use and it is continued on the next row.

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

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

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

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

=back

=head2 RENDITION

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

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

=over 4

=item $rend = urxvt::DEFAULT_RSTYLE

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

=back

=cut

=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:	1.14
Committed:	Tue Jan 3 01:15:00 2006 UTC (18 years, 4 months ago) by root
Branch:	MAIN
Changes since 1.13:	+8 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	=head1 NAME
2
3	root	1.11	@@RXVT_NAME@@perl - 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	root	1.11	=item on_keyboard_command $term, $string
130
131			Called whenever the user presses a key combination that has a
132			C<perl:string> action bound to it (see description of the B<keysym>
133			resource in the @@RXVT_NAME@@(1) manpage).
134
135	root	1.1	=back
136
137			=head2 Functions in the C<urxvt> Package
138
139			=over 4
140
141			=item urxvt::fatal $errormessage
142
143			Fatally aborts execution with the given error message. Avoid at all
144			costs! The only time this is acceptable is when the terminal process
145			starts up.
146
147			=item urxvt::warn $string
148
149	root	1.6	Calls C<rxvt_warn> with the given string which should not include a
150	root	1.1	newline. The module also overwrites the C<warn> builtin with a function
151			that calls this function.
152
153			Using this function has the advantage that its output ends up in the
154			correct place, e.g. on stderr of the connecting urxvtc client.
155
156			=item $time = urxvt::NOW
157
158			Returns the "current time" (as per the event loop).
159
160			=cut
161
162			package urxvt;
163
164			use strict;
165
166			our $term;
167			our @HOOKNAME;
168			our $LIBDIR;
169
170			BEGIN {
171			urxvt->bootstrap;
172
173			# overwrite perl's warn
174			*CORE::GLOBAL::warn = sub {
175			my $msg = join "", @_;
176			$msg .= "\n"
177			unless $msg =~ /\n$/;
178			urxvt::warn ($msg);
179			};
180			}
181
182	root	1.8	my @hook_count;
183	root	1.7	my $verbosity = $ENV{URXVT_PERL_VERBOSITY};
184	root	1.1
185			sub verbose {
186			my ($level, $msg) = @_;
187	root	1.8	warn "$msg\n" if $level <= $verbosity;
188	root	1.1	}
189
190			# find on_xxx subs in the package and register them
191			# as hooks
192			sub register_package($) {
193			my ($pkg) = @_;
194
195	root	1.7	for my $htype (0.. $#HOOKNAME) {
196			my $name = $HOOKNAME[$htype];
197	root	1.1
198			my $ref = $pkg->can ("on_" . lc $name)
199			or next;
200
201	root	1.7	$term->{_hook}[$htype]{$ref*1} = $ref;
202			$hook_count[$htype]++
203			or set_should_invoke $htype, 1;
204	root	1.1	}
205			}
206
207			my $script_pkg = "script0000";
208			my %script_pkg;
209
210			# load a single script into its own package, once only
211	root	1.7	sub script_package($) {
212	root	1.1	my ($path) = @_;
213
214			$script_pkg{$path} \|\|= do {
215	root	1.8	my $pkg = "urxvt::" . ($script_pkg++);
216
217	root	1.1	verbose 3, "loading script '$path' into package '$pkg'";
218
219			open my $fh, "<:raw", $path
220			or die "$path: $!";
221
222	root	1.8	my $source = "package $pkg; use strict; use utf8;\n"
223			. "#line 1 \"$path\"\n{\n"
224			. (do { local $/; <$fh> })
225			. "\n};\n1";
226
227			eval $source or die "$path: $@";
228	root	1.1
229			$pkg
230	root	1.7	}
231	root	1.1	}
232
233	root	1.8	# called by the rxvt core
234			sub invoke {
235			local $term = shift;
236			my $htype = shift;
237	root	1.6
238	root	1.8	if ($htype == 0) { # INIT
239	root	1.9	my @dirs = ((split /:/, $term->resource ("perl_lib")), "$LIBDIR/perl");
240	root	1.6
241	root	1.8	for my $ext (split /:/, $term->resource ("perl_ext")) {
242			my @files = grep -f $_, map "$_/$ext", @dirs;
243	root	1.6
244	root	1.8	if (@files) {
245			register_package script_package $files[0];
246			} else {
247			warn "perl extension '$ext' not found in perl library search path\n";
248			}
249			}
250	root	1.6
251	root	1.8	} elsif ($htype == 1) { # DESTROY
252			if (my $hook = $term->{_hook}) {
253			for my $htype (0..$#$hook) {
254			$hook_count[$htype] -= scalar keys %{ $hook->[$htype] \|\| {} }
255			or set_should_invoke $htype, 0;
256			}
257			}
258			}
259	root	1.6
260	root	1.8	my $cb = $term->{_hook}[$htype]
261			or return;
262	root	1.6
263	root	1.8	verbose 10, "$HOOKNAME[$htype] (" . (join ", ", $term, @_) . ")"
264			if $verbosity >= 10;
265	root	1.7
266	root	1.8	while (my ($k, $v) = each %$cb) {
267			return 1 if $v->($term, @_);
268	root	1.7	}
269
270	root	1.8	0
271	root	1.7	}
272	root	1.1
273			=back
274
275			=head2 The C<urxvt::term> Class
276
277			=over 4
278
279	root	1.4	=item $value = $term->resource ($name[, $newval])
280
281			Returns the current resource value associated with a given name and
282			optionally sets a new value. Setting values is most useful in the C<init>
283			hook. Unset resources are returned and accepted as C<undef>.
284
285			The new value must be properly encoded to a suitable character encoding
286			before passing it to this method. Similarly, the returned value may need
287			to be converted from the used encoding to text.
288
289			Resource names are as defined in F<src/rsinc.h>. Colours can be specified
290			as resource names of the form C<< color+<index> >>, e.g. C<color+5>. (will
291			likely change).
292
293			Please note that resource strings will currently only be freed when the
294			terminal is destroyed, so changing options frequently will eat memory.
295
296	root	1.5	Here is a a likely non-exhaustive list of resource names, not all of which
297			are supported in every build, please see the source to see the actual
298			list:
299
300			answerbackstring backgroundPixmap backspace_key boldFont boldItalicFont
301			borderLess color cursorBlink cursorUnderline cutchars delete_key
302			display_name embed ext_bwidth fade font geometry hold iconName
303			imFont imLocale inputMethod insecure int_bwidth intensityStyles
304	root	1.8	italicFont jumpScroll lineSpace loginShell mapAlert menu meta8 modifier
305			mouseWheelScrollPage name pastableTabs path perl_eval perl_ext
306	root	1.6	perl_lib pointerBlank pointerBlankDelay preeditType print_pipe pty_fd
307			reverseVideo saveLines scrollBar scrollBar_align scrollBar_floating
308			scrollBar_right scrollBar_thickness scrollTtyKeypress scrollTtyOutput
309			scrollWithBuffer scrollstyle secondaryScreen secondaryScroll selectstyle
310			shade term_name title transparent transparent_all tripleclickwords
311			utmpInhibit visualBell
312	root	1.5
313	root	1.4	=cut
314
315			sub urxvt::term::resource($$;$) {
316			my ($self, $name) = (shift, shift);
317			unshift @_, $self, $name, ($name =~ s/\s\+\s(\d+)$// ? $1 : 0);
318			goto &urxvt::term::_resource;
319			}
320
321	root	1.1	=item ($row, $col) = $term->selection_mark ([$row, $col])
322
323			=item ($row, $col) = $term->selection_beg ([$row, $col])
324
325			=item ($row, $col) = $term->selection_end ([$row, $col])
326
327			Return the current values of the selection mark, begin or end positions,
328			and optionally set them to new values.
329
330			=item $success = $term->selection_grab ($eventtime)
331
332			Try to request the primary selection from the server (for example, as set
333			by the next method).
334
335			=item $oldtext = $term->selection ([$newtext])
336
337			Return the current selection text and optionally replace it by C<$newtext>.
338
339			=item $term->scr_overlay ($x, $y, $text)
340
341			Create a simple multi-line overlay box. See the next method for details.
342
343			=cut
344
345			sub urxvt::term::scr_overlay {
346			my ($self, $x, $y, $text) = @_;
347
348			my @lines = split /\n/, $text;
349
350			my $w = 0;
351	root	1.6	for (map $self->strwidth ($_), @lines) {
352	root	1.1	$w = $_ if $w < $_;
353			}
354
355			$self->scr_overlay_new ($x, $y, $w, scalar @lines);
356			$self->scr_overlay_set (0, $_, $lines[$_]) for 0.. $#lines;
357			}
358
359			=item $term->scr_overlay_new ($x, $y, $width, $height)
360
361			Create a new (empty) overlay at the given position with the given
362			width/height. A border will be put around the box. If either C<$x> or
363			C<$y> is negative, then this is counted from the right/bottom side,
364			respectively.
365
366			=item $term->scr_overlay_off
367
368			Switch the overlay off again.
369
370			=item $term->scr_overlay_set_char ($x, $y, $char, $rend = OVERLAY_RSTYLE)
371
372			Put a single character (specified numerically) at the given overlay
373			position.
374
375			=item $term->scr_overlay_set ($x, $y, $text)
376
377			Write a string at the given position into the overlay.
378
379	root	1.6	=item $cellwidth = $term->strwidth $string
380
381			Returns the number of screen-cells this string would need. Correctly
382			accounts for wide and combining characters.
383
384			=item $octets = $term->locale_encode $string
385
386			Convert the given text string into the corresponding locale encoding.
387
388			=item $string = $term->locale_decode $octets
389
390			Convert the given locale-encoded octets into a perl string.
391
392			=item $term->tt_write ($octets)
393
394			Write the octets given in C<$data> to the tty (i.e. as program input). To
395	root	1.12	pass characters instead of octets, you should convert your strings first
396			to the locale-specific encoding using C<< $term->locale_encode >>.
397
398	root	1.13	=item $nrow = $term->nrow
399
400			=item $ncol = $term->ncol
401
402			Return the number of rows/columns of the terminal window (i.e. as
403			specified by C<-geometry>, excluding any scrollback).
404
405	root	1.12	=item $nsaved = $term->nsaved
406
407			Returns the number of lines in the scrollback buffer.
408
409			=item $view_start = $term->view_start ([$newvalue])
410
411			Returns the negative row number of the topmost line. Minimum value is
412			C<0>, which displays the normal terminal contents. Larger values scroll
413			this many lines into the scrollback buffer.
414
415	root	1.14	=item $term->want_refresh
416
417			Requests a screen refresh. At the next opportunity, rxvt-unicode will
418			compare the on-screen display with its stored representation. If they
419			differ, it redraws the differences.
420
421			Used after changing terminal contents to display them.
422
423	root	1.13	=item $text = $term->ROW_t ($row_number[, $new_text[, $start_col]])
424	root	1.12
425			Returns the text of the entire row with number C<$row_number>. Row C<0>
426			is the topmost terminal line, row C<< $term->$ncol-1 >> is the bottommost
427			terminal line. The scrollback buffer starts at line C<-1> and extends to
428			line C<< -$term->nsaved >>.
429
430	root	1.13	If C<$new_text> is specified, it will replace characters in the current
431			line, starting at column C<$start_col> (default C<0>), which is useful
432			to replace only parts of a line. The font iindex in the rendition will
433			automatically be updated.
434	root	1.12
435			C<$text> is in a special encoding: tabs and wide characters that use more
436			than one cell when displayed are padded with urxvt::NOCHAR characters
437			(C<chr 65535>). Characters with combining characters and other characters
438			that do not fit into the normal tetx encoding will be replaced with
439			characters in the private use area.
440
441			You have to obey this encoding when changing text. The advantage is
442			that C<substr> and similar functions work on screen cells and not on
443			characters.
444
445			The methods C<< $term->special_encode >> and C<< $term->special_decode >>
446			can be used to convert normal strings into this encoding and vice versa.
447
448	root	1.13	=item $rend = $term->ROW_r ($row_number[, $new_rend[, $start_col]])
449
450			Like C<< $term->ROW_t >>, but returns an arrayref with rendition
451			bitsets. Rendition bitsets contain information about colour, font, font
452			styles and similar information. See also C<< $term->ROW_t >>.
453
454			When setting rendition, the font mask will be ignored.
455	root	1.12
456	root	1.13	See the section on RENDITION, below.
457
458			=item $length = $term->ROW_l ($row_number[, $new_length])
459
460			Returns the number of screen cells that are in use ("the line length"). If
461			it is C<-1>, then the line is part of a multiple-row logical "line", which
462			means all characters are in use and it is continued on the next row.
463	root	1.12
464			=item $text = $term->special_encode $string
465
466			Converts a perl string into the special encoding used by rxvt-unicode,
467			where one character corresponds to one screen cell. See
468			C<< $term->ROW_t >> for details.
469
470			=item $string = $term->special_decode $text
471
472			Converts rxvt-unicodes text reprsentation into a perl string. See
473			C<< $term->ROW_t >> for details.
474	root	1.6
475	root	1.1	=back
476
477	root	1.13	=head2 RENDITION
478
479			Rendition bitsets contain information about colour, font, font styles and
480			similar information for each screen cell.
481
482			The following "macros" deal with changes in rendition sets. You should
483			never just create a bitset, you should always modify an existing one,
484			as they contain important information required for correct operation of
485			rxvt-unicode.
486
487			=over 4
488
489			=item $rend = urxvt::DEFAULT_RSTYLE
490
491			Returns the default rendition, as used when the terminal is starting up or
492			being reset. Useful as a base
493
494			=back
495
496			=cut
497
498	root	1.1	=head2 The C<urxvt::timer> Class
499
500			This class implements timer watchers/events. Time is represented as a
501			fractional number of seconds since the epoch. Example:
502
503			# create a digital clock display in upper right corner
504			$term->{timer} = urxvt::timer
505			->new
506			->start (urxvt::NOW)
507			->cb (sub {
508			my ($timer) = @_;
509			my $time = $timer->at;
510			$timer->start ($time + 1);
511			$self->scr_overlay (-1, 0,
512			POSIX::strftime "%H:%M:%S", localtime $time);
513			});
514
515			=over 4
516
517			=item $timer = new urxvt::timer
518
519			Create a new timer object in stopped state.
520
521			=item $timer = $timer->cb (sub { my ($timer) = @_; ... })
522
523			Set the callback to be called when the timer triggers.
524
525			=item $tstamp = $timer->at
526
527			Return the time this watcher will fire next.
528
529			=item $timer = $timer->set ($tstamp)
530
531			Set the time the event is generated to $tstamp.
532
533			=item $timer = $timer->start
534
535			Start the timer.
536
537			=item $timer = $timer->start ($tstamp)
538
539			Set the event trigger time to C<$tstamp> and start the timer.
540
541			=item $timer = $timer->stop
542
543			Stop the timer.
544
545			=back
546
547			=head2 The C<urxvt::iow> Class
548
549			This class implements io watchers/events. Example:
550
551			$term->{socket} = ...
552			$term->{iow} = urxvt::iow
553			->new
554			->fd (fileno $term->{socket})
555			->events (1) # wait for read data
556			->start
557			->cb (sub {
558			my ($iow, $revents) = @_;
559			# $revents must be 1 here, no need to check
560			sysread $term->{socket}, my $buf, 8192
561			or end-of-file;
562			});
563
564
565			=over 4
566
567			=item $iow = new urxvt::iow
568
569			Create a new io watcher object in stopped state.
570
571			=item $iow = $iow->cb (sub { my ($iow, $reventmask) = @_; ... })
572
573			Set the callback to be called when io events are triggered. C<$reventmask>
574			is a bitset as described in the C<events> method.
575
576			=item $iow = $iow->fd ($fd)
577
578			Set the filedescriptor (not handle) to watch.
579
580			=item $iow = $iow->events ($eventmask)
581
582			Set the event mask to watch. Bit #0 (value C<1>) enables watching for read
583			data, Bit #1 (value C<2>) enables watching for write data.
584
585			=item $iow = $iow->start
586
587			Start watching for requested events on the given handle.
588
589			=item $iow = $iow->stop
590
591			Stop watching for events on the given filehandle.
592
593			=back
594
595	root	1.4	=head1 ENVIRONMENT
596
597			=head2 URXVT_PERL_VERBOSITY
598
599			This variable controls the verbosity level of the perl extension. Higher
600			numbers indicate more verbose output.
601
602			=over 4
603
604			=item 0 - only fatal messages
605
606			=item 3 - script loading and management
607
608			=item 10 - all events received
609
610			=back
611
612	root	1.1	=head1 AUTHOR
613
614			Marc Lehmann <pcg@goof.com>
615			http://software.schmorp.de/pkg/rxvt-unicode
616
617			=cut
618
619			1