Initial commit

1 files changed, 2478 insertions, 0 deletions

diff --git a/irssi/scripts/autorun/adv_windowlist.pl b/irssi/scripts/autorun/adv_windowlist.pl
new file mode 100644
index 0000000..780ab35
--- /dev/null
+++ b/irssi/scripts/autorun/adv_windowlist.pl
@@ -0,0 +1,2478 @@
+use strict; # use warnings;
+
+# {{{ debug
+
+#BEGIN {
+#	open STDERR, '>', '/home/ailin/wlstatwarnings';
+#};
+
+# FIXME COULD SOMEONE PLEASE TELL ME HOW TO SHUT UP
+#
+# ...
+# Variable "*" will not stay shared at (eval *) line *.
+# Variable "*" will not stay shared at (eval *) line *.
+# ...
+# Can't locate package Irssi::Nick for @Irssi::Irc::Nick::ISA at (eval *) line *.
+# ...
+#
+# THANKS
+
+# }}}
+
+# if you don't know how to operate folds, type zn
+
+# {{{ header
+
+use Irssi (); # which is the minimum required version of Irssi ?
+use Irssi::TextUI;
+
+use vars qw($VERSION %IRSSI);
+
+$VERSION = '0.6ca';
+%IRSSI = (
+	original_authors => q(BC-bd,        Veli,          Timo Sirainen, ).
+	                    q(Wouter Coekaerts,    Jean-Yves Lefort), # (decadix)
+	original_contact => q(bd@bc-bd.org, veli@piipiip.net, tss@iki.fi, ).
+	                    q(wouter@coekaerts.be, jylefort@brutele.be),
+	authors          => q(Nei),
+	contact          => q(Nei @ anti@conference.jabber.teamidiot.de),
+	url              =>  "http://anti.teamidiot.de/",
+	name             => q(awl),
+	description      => q(Adds a permanent advanced window list on the right or ).
+	                    q(in a statusbar.),
+	description2     => q(Based on chanact.pl which was apparently based on ).
+	                    q(lightbar.c and nicklist.pl with various other ideas ).
+	                    q(from random scripts.),
+	license          => q(GNU GPLv2 or later),
+);
+
+# }}}
+
+# {{{ *** D O C U M E N T A T I O N ***
+
+# adapted by Nei
+
+###############
+# {{{ original comment
+# ###########
+# # Adds new powerful and customizable [Act: ...] item (chanelnames,modes,alias).
+# # Lets you give alias characters to windows so that you can select those with
+# # meta-<char>.
+# #
+# # for irssi 0.8.2 by bd@bc-bd.org
+# #
+# # inspired by chanlist.pl by 'cumol@hammerhart.de'
+# #
+# #########
+# # {{{ Contributors
+# #########
+# #
+# # veli@piipiip.net   /window_alias code
+# # qrczak@knm.org.pl  chanact_abbreviate_names
+# # qerub@home.se      Extra chanact_show_mode and chanact_chop_status
+# # }}}
+# }}}
+# 
+# {{{ FURTHER THANKS TO
+# ############
+# # buu, fxn, Somni, Khisanth, integral, tybalt89   for much support in any aspect perl
+# # and the channel in general ( #perl @ freenode ) and especially the ir_* functions
+# #
+# # Valentin 'senneth' Batz ( vb@g-23.org ) for the pointer to grep.pl, continuous support
+# #                                         and help in digging up ir_strip_codes
+# #
+# # OnetrixNET technology networks for the debian environment
+# #
+# # Monkey-Pirate.com / Spaceman Spiff for the webspace
+# #
+# }}}
+
+######
+# {{{ M A I N    P R O B L E M
+#####
+#
+# It is impossible to place the awl on a statusbar together with other items,
+# because I do not know how to calculate the size that it is going to get
+# granted, and therefore I cannot do the linebreaks properly.
+# This is what is missing to make a nice script out of awl.
+# If you have any ideas, please contact me ASAP :).
+# }}}
+######
+
+######
+# {{{ UTF-8 PROBLEM
+#####
+#
+# Please help me find a solution to this:
+# this be your statusbar, it is using up the maximum term size
+# [[1=1]#abc [2=2]#defghi]
+# 
+# now consider this example:i
+# "ascii" characters are marked with ., utf-8 characters with *
+# [[1=1]#... [2=2]#...***]
+#
+# you should think that this is how it would be displayed? WRONG!
+# [[1=1]#... [2=2]#...***   ]
+#
+# this is what Irssi does.. I believe my length calculating code to be correct,
+# however, I'd love to be proven wrong (or receive any other fix, too, of
+# course!)
+# }}}
+######
+
+#########
+# {{{ USAGE
+###
+#
+# copy the script to ~/.irssi/scripts/
+#
+# In irssi:
+#
+#		/script load awl
+#
+#
+# Hint: to get rid of the old [Act:] display
+#     /statusbar window remove act
+#
+# to get it back:
+#     /statusbar window add -after lag -priority 10 act
+# }}}
+##########
+# {{{ OPTIONS
+########
+#
+# {{{ /set awl_display_nokey <string>
+#     /set awl_display_key <string>
+#     /set awl_display_nokey_active <string>
+#     /set awl_display_key_active <string>
+#     * string : Format String for one window. The following $'s are expanded:
+#         $C : Name
+#         $N : Number of the Window
+#         $Q : meta-Keymap
+#         $H : Start highlighting
+#         $S : Stop highlighting
+#             /+++++++++++++++++++++++++++++++++,
+#            | ****  I M P O R T A N T :  ****  |
+#            |                                  |
+#            | don't forget  to use  $S  if you |
+#            | used $H before!                  |
+#            |                                  |
+#            '+++++++++++++++++++++++++++++++++/
+#       XXX NOTE ON *_active: there is a BUG somewhere in the length
+#       XXX calculation. currently it's best to NOT remove $H/$S from those
+#       XXX settings if you use it in the non-active settings.
+# }}}
+# {{{ /set awl_separator <string>
+#     * string : Charater to use between the channel entries
+#     you'll need to escape " " space and "$" like this:
+#     "/set awl_separator \ "
+#     "/set awl_separator \$"
+#     and {}% like this:
+#     "/set awl_separator %{"
+#     "/set awl_separator %}"
+#     "/set awl_separator %%"
+#     (reason being, that the separator is used inside a {format })
+# }}}
+# {{{ /set awl_prefer_name <ON|OFF>
+#     * this setting decides whether awl will use the active_name (OFF) or the
+#       window name as the name/caption in awl_display_*.
+#       That way you can rename windows using /window name myownname.
+# }}}
+# {{{ /set awl_hide_data <num>
+#     * num : hide the window if its data_level is below num
+#     set it to 0 to basically disable this feature,
+#               1 if you don't want windows without activity to be shown
+#               2 to show only those windows with channel text or hilight
+#               3 to show only windows with hilight
+# }}}
+# {{{ /set awl_maxlines <num>
+#     * num : number of lines to use for the window list (0 to disable, negative
+#       lock)
+# }}}
+# {{{ /set awl_columns <num>
+#     * num : number of columns to use in screen mode (0 for unlimited)
+# }}}
+# {{{ /set awl_block <num>
+#     * num : width of a column in screen mode (negative values = block display)
+#             /+++++++++++++++++++++++++++++++++,
+#            | ******  W A R N I N G !  ******  |
+#            |                                  |
+#            | If  your  block  display  looks  |
+#            | DISTORTED,  you need to add the  |
+#            | following  line to your  .theme  |
+#            | file under                       |
+#            |     abstracts = {             :  |
+#            |                                  |
+#            |       sb_act_none = "%n$*";      |
+#            |                                  |
+#            '+++++++++++++++++++++++++++++++++/
+#.02:08:26. < shi>  Irssi::current_theme()->get_format <.. can this be used?
+# }}}
+# {{{ /set awl_sbar_maxlength <ON|OFF>
+#     * if you enable the maxlength setting, the block width will be used as a
+#       maximum length for the non-block statusbar mode too.
+# }}}
+# {{{ /set awl_height_adjust <num>
+#     * num : how many lines to leave empty in screen mode
+# }}}
+# {{{ /set awl_sort <-data_level|-last_line|refnum>
+#     * you can change the window sort order with this variable
+#         -data_level : sort windows with hilight first
+#         -last_line  : sort windows in order of activity
+#         refnum      : sort windows by window number
+# }}}
+# {{{ /set awl_placement <top|bottom>
+#     /set awl_position <num>
+#     * these settings correspond to /statusbar because awl will create
+#       statusbars for you
+#     (see /help statusbar to learn more)
+# }}}
+# {{{ /set awl_all_disable <ON|OFF>
+#     * if you set awl_all_disable to ON, awl will also remove the
+#       last statusbar it created if it is empty.
+#       As you might guess, this only makes sense with awl_hide_data > 0 ;)
+# }}}
+# {{{ /set awl_automode <sbar|screen|emulate_lightbar>
+#     * this setting defines whether the window list is shown in statusbars or
+#       whether the screen hack is used (from nicklist.pl)
+# }}}
+# }}}
+##########
+# {{{ COMMANDS
+########
+# {{{ /awl paste <ON|OFF|TOGGLE>
+#     * enables or disables the screen hack windowlist. This is useful when you
+#       want to mark & copy text that you want to paste somewhere (hence the
+#       name). (ON means AWL disabled!)
+#       This is nicely bound to a function key for example.
+# }}}
+# {{{ /awl redraw
+#     * redraws the screen hack windowlist. There are many occasions where the
+#       screen hack windowlist can get destroyed so you can use this command to
+#       fix it.
+# }}}
+# }}}
+###
+# {{{ WISHES
+####
+#
+# if you fiddle with my mess, provide me with your fixes so I can benefit as well
+#
+# Nei =^.^= ( anti@conference.jabber.teamidiot.de )
+# }}}
+
+# }}}
+
+# {{{ modules
+
+#use Class::Classless;
+#use Term::Info;
+
+# }}}
+
+# {{{ global variables
+
+my $replaces = '[=]'; # AARGH!!! (chars that are always surrounded by weird
+                      # colour codes by Irssi)
+
+my $actString = [];   # statusbar texts
+my $currentLines = 0;
+my $resetNeeded;      # layout/screen has changed, redo everything
+my $needRemake;       # "normal" changes
+#my $callcount = 0;
+sub GLOB_QUEUE_TIMER () { 100 }
+my $globTime = undef; # timer to limit remake() calls
+
+
+my $SCREEN_MODE;
+my $DISABLE_SCREEN_TEMP;
+my $currentColumns = 0;
+my $screenResizing;
+my ($screenHeight, $screenWidth);
+my $screenansi = bless {
+	NAME => 'Screen::ANSI',
+	PARENTS => [],
+	METHODS => {
+		dcs   => sub { "\033P" },
+		st    => sub { "\033\\"},
+	}
+}, 'Class::Classless::X';
+#my $terminfo = new Term::Info 'xterm'; # xterm here, make this modular
+# {{{{{{{{{{{{{{{
+my $terminfo = bless { # xterm here, make this modular
+	NAME => 'Term::Info::xterm',
+	PARENTS => [],
+	METHODS => {
+ # 	civis=\E[?25l,
+		civis => sub { "\033[?25l" },
+ # 	sc=\E7,
+		sc    => sub { "\0337" },
+ # 	cup=\E[%i%p1%d;%p2%dH,
+		cup   => sub { shift;shift; "\033[" . ($_[0] + 1) . ';' . ($_[1] + 1) . 'H' },
+ # 	el=\E[K,
+		el    => sub { "\033[K" },
+ # 	rc=\E8,
+		rc    => sub { "\0338" },
+ # 	cnorm=\E[?25h,
+		cnorm => sub { "\033[?25h" },
+ # 	setab=\E[4%p1%dm,
+		setab => sub { shift;shift; "\033[4" . $_[0] . 'm' },
+ # 	setaf=\E[3%p1%dm,
+		setaf => sub { shift;shift; "\033[3" . $_[0] . 'm' },
+ # 	bold=\E[1m,
+		bold  => sub { "\033[1m" },
+ # 	blink=\E[5m,
+		blink => sub { "\033[5m" },
+ # 	rev=\E[7m,
+		rev   => sub { "\033[7m" },
+ # 	op=\E[39;49m,
+		op    => sub { "\033[39;49m" },
+	}
+}, 'Class::Classless::X';
+# }}}}}}}}}}}}}}}
+
+
+sub setc () {
+	$IRSSI{'name'}
+}
+sub set ($) {
+	setc . '_' . shift
+}
+
+# }}}
+
+
+# {{{ sbar mode
+
+my %statusbars;       # currently active statusbars
+
+# maybe I should just tie the array ?
+sub add_statusbar {
+	for (@_) {
+		# add subs
+		for my $l ($_) { {
+			no strict 'refs'; # :P
+			*{set$l} = sub { awl($l, @_) };
+		}; }
+		Irssi::command('statusbar ' . (set$_) . ' reset');
+		Irssi::command('statusbar ' . (set$_) . ' enable');
+		if (lc Irssi::settings_get_str(set 'placement') eq 'top') {
+			Irssi::command('statusbar ' . (set$_) . ' placement top');
+		}
+		if ((my $x = int Irssi::settings_get_int(set 'position')) != 0) {
+			Irssi::command('statusbar ' . (set$_) . ' position ' . $x);
+		}
+		Irssi::command('statusbar ' . (set$_) . ' add -priority 100 -alignment left barstart');
+		Irssi::command('statusbar ' . (set$_) . ' add ' . (set$_));
+		Irssi::command('statusbar ' . (set$_) . ' add -priority 100 -alignment right barend');
+		Irssi::command('statusbar ' . (set$_) . ' disable');
+		Irssi::statusbar_item_register(set$_, '$0', set$_);
+		$statusbars{$_} = {};
+	}
+}
+
+sub remove_statusbar {
+	for (@_) {
+		Irssi::command('statusbar ' . (set$_) . ' reset');
+		Irssi::statusbar_item_unregister(set$_); # XXX does this actually work ?
+		# DO NOT REMOVE the sub before you have unregistered it :))
+		for my $l ($_) { {
+			no strict 'refs';
+			undef &{set$l};
+		}; }
+		delete $statusbars{$_};
+	}
+}
+
+sub syncLines {
+	my $temp = $currentLines;
+	$currentLines = @$actString;
+	#Irssi::print("current lines: $temp new lines: $currentLines");
+	my $currMaxLines = Irssi::settings_get_int(set 'maxlines');
+	if ($currMaxLines > 0 and @$actString > $currMaxLines) {
+		$currentLines = $currMaxLines;
+	}
+	elsif ($currMaxLines < 0) {
+		$currentLines = abs($currMaxLines);
+	}
+	return if ($temp == $currentLines);
+	if ($currentLines > $temp) {
+		for ($temp .. ($currentLines - 1)) {
+			add_statusbar($_);
+			Irssi::command('statusbar ' . (set$_) . ' enable');
+		}
+	}
+	else {
+		for ($_ = ($temp - 1); $_ >= $currentLines; $_--) {
+			Irssi::command('statusbar ' . (set$_) . ' disable');
+			remove_statusbar($_);
+		}
+	}
+}
+
+# FIXME implement $get_size_only check, and user $item->{min|max-size} ??
+sub awl {
+	my ($line, $item, $get_size_only) = @_;
+
+	if ($needRemake) {
+		$needRemake = undef;
+		remake();
+	}
+
+	my $text = $actString->[$line];  # DO NOT set the actual $actString->[$line] to '' here or
+	$text = '' unless defined $text; # you'll screw up the statusbar counter ($currentLines)
+	$item->default_handler($get_size_only, $text, '', 1);
+}
+
+# remove old statusbars
+my %killBar;
+sub get_old_status {
+	my ($textDest, $cont, $cont_stripped) = @_;
+	if ($textDest->{'level'} == 524288 and $textDest->{'target'} eq ''
+			and !defined($textDest->{'server'})
+	) {
+		my $name = quotemeta(set '');
+		if ($cont_stripped =~ m/^$name(\d+)\s/) { $killBar{$1} = {}; }
+		Irssi::signal_stop();
+	}
+}
+sub killOldStatus {
+	%killBar = ();
+	Irssi::signal_add_first('print text' => 'get_old_status');
+	Irssi::command('statusbar');
+	Irssi::signal_remove('print text' => 'get_old_status');
+	remove_statusbar(keys %killBar);
+}
+#killOldStatus();
+
+# end sbar mode }}}
+
+
+# {{{ keymaps
+
+my %keymap;
+
+sub get_keymap {
+	my ($textDest, undef, $cont_stripped) = @_;
+	if ($textDest->{'level'} == 524288 and $textDest->{'target'} eq ''
+			and !defined($textDest->{'server'})
+	) {
+		if ($cont_stripped =~ m/((?:meta-)+)(.)\s+change_window (\d+)/) {
+			my ($level, $key, $window) = ($1, $2, $3);
+			my $numlevel = ($level =~ y/-//) - 1;
+			$keymap{$window} = ('-' x $numlevel) . "$key";
+		}
+		Irssi::signal_stop();
+	}
+}
+
+sub update_keymap {
+	%keymap = ();
+	Irssi::signal_remove('command bind' => 'watch_keymap');
+	Irssi::signal_add_first('print text' => 'get_keymap');
+	Irssi::command('bind'); # stolen from grep
+	Irssi::signal_remove('print text' => 'get_keymap');
+	Irssi::signal_add('command bind' => 'watch_keymap');
+	Irssi::timeout_add_once(100, 'eventChanged', undef);
+}
+
+# watch keymap changes
+sub watch_keymap {
+	Irssi::timeout_add_once(1000, 'update_keymap', undef);
+}
+
+update_keymap();
+
+# end keymaps }}}
+
+# {{{ format handling
+
+# a bad way do do expansions but who cares
+sub expand {
+	my ($string, %format) = @_;
+	my ($exp, $repl);
+	$string =~ s/\$$exp/$repl/g while (($exp, $repl) = each(%format));
+	return $string;
+}
+
+my %strip_table = (
+	# fe-common::core::formats.c:format_expand_styles
+	#      delete                format_backs  format_fores bold_fores   other stuff
+	(map { $_ => '' } (split //, '04261537' .  'kbgcrmyw' . 'KBGCRMYW' . 'U9_8:|FnN>#[')),
+	#      escape
+	(map { $_ => $_ } (split //, '{}%')),
+);
+sub ir_strip_codes { # strip %codes
+	my $o = shift;
+	$o =~ s/(%(.))/exists $strip_table{$2} ? $strip_table{$2} : $1/gex;
+	$o
+}
+
+sub ir_parse_special {
+	my $o; my $i = shift;
+	#if ($_[0]) { # for the future?!?
+	#	eval {
+	#		$o = $_[0]->parse_special($i);
+	#	};
+	#	unless ($@) {
+	#		return $o;
+	#	}
+	#}
+	my $win = shift || Irssi::active_win();
+	my $server = Irssi::active_server();
+	if (ref $win and ref $win->{'active'}) {
+		$o = $win->{'active'}->parse_special($i);
+	}
+	elsif (ref $win and ref $win->{'active_server'}) {
+		$o = $win->{'active_server'}->parse_special($i);
+	}
+	elsif (ref $server) {
+		$o =  $server->parse_special($i);
+	}
+	else {
+		$o = Irssi::parse_special($i);
+	}
+	$o
+}
+sub ir_parse_special_protected {
+	my $o; my $i = shift;
+	$i =~ s/
+		( \\. ) | # skip over escapes (maybe)
+		( \$[^% $\]+ ) # catch special variables
+	/
+		if ($1) { $1 }
+		elsif ($2) { my $i2 = $2; ir_fe(ir_parse_special($i2, @_)) }
+		else { $& }
+	/gex;
+	$i
+}
+
+
+sub sb_ctfe { # Irssi::current_theme->format_expand wrapper
+	Irssi::current_theme->format_expand(
+		shift,
+		(
+			Irssi::EXPAND_FLAG_IGNORE_REPLACES
+				|
+			($_[0]?0:Irssi::EXPAND_FLAG_IGNORE_EMPTY)
+		)
+	)
+}
+sub sb_expand { # expand {format }s (and apply parse_special for $vars)
+	ir_parse_special(
+		sb_ctfe(shift)
+	)
+}
+sub sb_strip {
+	ir_strip_codes(
+		sb_expand(shift)
+	); # does this get us the actual length of that s*ty bar :P ?
+}
+sub sb_length {
+	# unicode cludge, d*mn broken Irssi
+	# screw it, this will fail from broken joining anyway (and cause warnings)
+	my $term_type = 'term_type';
+	if (Irssi::version > 20040819) { # this is probably wrong, but I don't know
+		                              # when the setting name got changed
+		$term_type = 'term_charset';
+	}
+	#if (lc Irssi::settings_get_str($term_type) eq '8bit'
+	#		or Irssi::settings_get_str($term_type) =~ /^iso/i
+	#) {
+	#	length(sb_strip(shift))
+	#}
+	#else {
+	my $temp = sb_strip(shift);
+	# try to get the displayed width
+	my $length;
+	eval {
+		require Text::CharWidth;
+		$length = Text::CharWidth::mbswidth($temp);
+	};
+	unless ($@) {
+		return $length;
+	}
+	else {
+		if (lc Irssi::settings_get_str($term_type) eq 'utf-8') {
+			# try to switch on utf8
+			eval {
+				no warnings;
+				require Encode;
+				#$temp = Encode::decode_utf8($temp); # thanks for the hint, but I have my
+				#                                    # reasons for _utf8_on
+				Encode::_utf8_on($temp);
+			};
+		}
+		# there is nothing more I can do
+		length($temp)
+	}
+	#}
+}
+
+# !!! G*DD*MN Irssi is adding an additional layer of backslashitis per { } layer
+# !!! AND I still don't know what I need to escape.
+# !!! and NOONE else seems to know or care either.
+# !!! f*ck open source. I mean it.
+# XXX any Irssi::print debug statement leads to SEGFAULT - why ?
+
+# major parts of the idea by buu (#perl @ freenode)
+# thanks to fxn and Somni for debugging
+#	while ($_[0] =~ /(.)/g) {
+#		my $c = $1; # XXX sooo... goto kills $1
+#		if ($q eq '%') { goto ESC; }
+
+## <freenode:#perl:tybalt89> s/%(.)|(\{)|(\})|(\\|\$)/$1?$1:$2?($level++,$2):$3?($level>$min_level&&$level--,$3):'\\'x(2**$level-1).$4/ge;  # untested...
+sub ir_escape {
+	my $min_level = $_[1] || 0; my $level = $min_level;
+	my $o = shift;
+	$o =~ s/
+		(	%.	)	| # $1
+		(	\{	)	| # $2
+		(	\}	)	| # $3
+		(	\\	)	| # $4
+		(	\$(?=[^\\])	)	| # $5
+		(	\$	) # $6
+	/
+		if ($1) { $1 } # %. escape
+		elsif ($2) { $level++; $2 } # { nesting start
+		elsif ($3) { if ($level > $min_level) { $level--; } $3 } # } nesting end
+		elsif ($4) { '\\'x(2**$level) } # \ needs \\escaping
+		elsif ($5) { '\\'x(2**$level-1) . '$' . '\\'x(2**$level-1) } # and $ needs even more because of "parse_special"
+		else { '\\'x(2**$level-1) . '$' } # $ needs \$ escaping
+	/gex;
+	$o
+}
+#sub ir_escape {
+#	my $min_level = $_[1] || 0; my $level = $min_level;
+#	my $o = shift;
+#	$o =~ s/
+#		(	%.	)	| # $1
+#		(	\{	)	| # $2
+#		(	\}	)	| # $3
+#		(	\\	|	\$	)	# $4
+#	/
+#		if ($1) { $1 } # %. escape
+#		elsif ($2) { $level++; $2 } # { nesting start
+#		elsif ($3) { if ($level > $min_level) { $level--; } $3 } # } nesting end
+#		else { '\\'x(2**($level-1)-1) . $4 } # \ or $ needs \\escaping
+#	/gex;
+#	$o
+#}
+
+sub ir_fe { # try to fix format stuff
+	my $x = shift;
+	# XXX why do I have to use two/four % here instead of one/two ??
+	# answer: you screwed up in ir_escape
+	$x =~ s/([%{}])/%$1/g;
+	#$x =~ s/(\\|\$|[ ])/\\$1/g; # XXX HOW CAN I HANDLE THE SPACES CORRECTLY XXX
+	$x =~ s/(\\|\$)/\\$1/g;
+	#$x =~ s/(\$(?=.))|(\$)/$1?"\\\$\\":"\\\$"/ge; # I think this should be here
+	#                                              # (logic), but it doesn't work
+	#                                              # that way :P
+	#$x =~ s/\\/\\\\/g; # that's right, escape escapes
+	$x
+}
+sub ir_ve { # escapes special vars but leave colours alone
+	my $x = shift;
+	#$x =~ s/([%{}])/%$1/g;
+	$x =~ s/(\\|\$|[ ])/\\$1/g;
+	$x
+}
+
+my %ansi_table;
+{
+	my ($i, $j, $k) = (0, 0, 0);
+	%ansi_table = (
+		# fe-common::core::formats.c:format_expand_styles
+		#      do                                              format_backs
+		(map { $_ => $terminfo->setab($i++) } (split //, '01234567' )),
+		#      do                                              format_fores
+		(map { $_ => $terminfo->setaf($j++) } (split //, 'krgybmcw' )),
+		#      do                                              bold_fores
+		(map { $_ => $terminfo->bold() .
+		             $terminfo->setaf($k++) } (split //, 'KRGYBMCW')),
+		# reset
+		#(map { $_ => $terminfo->op() } (split //, 'nN')),
+		(map { $_ => $terminfo->op() } (split //, 'n')),
+		(map { $_ => "\033[0m" } (split //, 'N')), # XXX quick and DIRTY
+		# flash/bright
+		F => $terminfo->blink(),
+		# reverse
+		8 => $terminfo->rev(),
+		# bold
+		(map { $_ => $terminfo->bold() } (split //, '9_')),
+		#      delete                other stuff
+		(map { $_ => '' } (split //, ':|>#[')),
+		#      escape
+		(map { $_ => $_ } (split //, '{}%')),
+	)
+}
+sub formats_to_ansi_basic {
+	my $o = shift;
+	$o =~ s/(%(.))/exists $ansi_table{$2} ? $ansi_table{$2} : $1/gex;
+	$o
+}
+
+sub lc1459 ($) { my $x = shift; $x =~ y/A-Z][\^/a-z}{|~/; $x }
+Irssi::settings_add_str(setc, 'banned_channels', '');
+Irssi::settings_add_bool(setc, 'banned_channels_on', 0);
+my %banned_channels = map { lc1459($_) => undef }
+split ' ', Irssi::settings_get_str('banned_channels');
+Irssi::settings_add_str(setc, 'fancy_abbrev', 'fancy');
+
+# }}}
+
+# {{{ main
+
+sub remake () {
+	#$callcount++;
+	#my $xx = $callcount; Irssi::print("starting remake [ $xx ]");
+	my ($hilight, $number, $display);
+	my $separator = '{sb_act_sep ' . Irssi::settings_get_str(set 'separator') .
+		'}';
+	my $custSort = Irssi::settings_get_str(set 'sort');
+	my $custSortDir = 1;
+	if ($custSort =~ /^[-!](.*)/) {
+		$custSortDir = -1;
+		$custSort = $1;
+	}
+
+	my @wins = 
+		sort {
+			(
+				( (int($a->{$custSort}) <=> int($b->{$custSort})) * $custSortDir )
+					||
+				($a->{'refnum'} <=> $b->{'refnum'})
+			)
+		} Irssi::windows;
+	my $block = Irssi::settings_get_int(set 'block');
+	my $columns = $currentColumns;
+	my $oldActString = $actString if $SCREEN_MODE;
+	$actString = $SCREEN_MODE ? ['   A W L'] : [];
+	my $line = $SCREEN_MODE ? 1 : 0;
+	my $width = $SCREEN_MODE
+			?
+		$screenWidth - abs($block)*$columns + 1
+			:
+		([Irssi::windows]->[0]{'width'} - sb_length('{sb x}'));
+	my $height = $screenHeight - abs(Irssi::settings_get_int(set
+			'height_adjust'));
+	my ($numPad, $keyPad) = (0, 0);
+	my %abbrevList;
+	if ($SCREEN_MODE or Irssi::settings_get_bool(set 'sbar_maxlength')
+			or ($block < 0)
+	) {
+		%abbrevList = ();
+		if (Irssi::settings_get_str('fancy_abbrev') !~ /^(no|off|head)/i) {
+			my @nameList = map { ref $_ ? $_->get_active_name : '' } @wins;
+			for (my $i = 0; $i < @nameList - 1; ++$i) {
+				my ($x, $y) = ($nameList[$i], $nameList[$i + 1]);
+				for ($x, $y) { s/^[+#!=]// }
+				my $res = Algorithm::LCSS::LCSS($x, $y);
+				if (defined $res) {
+					#Irssi::print("common pattern $x $y : $res");
+					#Irssi::print("found at $nameList[$i] ".index($nameList[$i],
+					#		$res));
+					$abbrevList{$nameList[$i]} = int (index($nameList[$i], $res) +
+						(length($res) / 2));
+					#Irssi::print("found at ".$nameList[$i+1]." ".index($nameList[$i+1],
+					#		$res));
+					$abbrevList{$nameList[$i+1]} = int (index($nameList[$i+1], $res) +
+						(length($res) / 2));
+				}
+			}
+		}
+		if ($SCREEN_MODE or ($block < 0)) {
+			$numPad = length((sort { length($b) <=> length($a) } keys %keymap)[0]);
+			$keyPad = length((sort { length($b) <=> length($a) } values %keymap)[0]);
+		}
+	}
+	if ($SCREEN_MODE) {
+		print STDERR $screenansi->dcs().
+		             $terminfo->civis().
+						 $terminfo->sc().
+						 $screenansi->st();
+		if (@$oldActString < 1) {
+			print STDERR $screenansi->dcs().
+							 $terminfo->cup(0, $width).
+			             $actString->[0].
+							 $terminfo->el().
+			             $screenansi->st();
+		}
+	}
+	foreach my $win (@wins) {
+		unless ($SCREEN_MODE) {
+			$actString->[$line] = '' unless defined $actString->[$line]
+					or Irssi::settings_get_bool(set 'all_disable');
+		}
+
+		# all stolen from chanact, what does this code do and why do we need it ?
+		!ref($win) && next;
+
+		my $name = $win->get_active_name;
+		$name = '*' if (Irssi::settings_get_bool('banned_channels_on') and exists
+			$banned_channels{lc1459($name)});
+		$name = $win->{'name'} if $name ne '*' and $win->{'name'} ne ''
+			and Irssi::settings_get_bool(set 'prefer_name');
+		my $active = $win->{'active'};
+		my $colour = $win->{'hilight_color'};
+		if (!defined $colour) { $colour = ''; }
+
+		if ($win->{'data_level'} < Irssi::settings_get_int(set 'hide_data')) {
+			next; } # for Geert
+		if    ($win->{'data_level'} == 0) { $hilight = '{sb_act_none '; }
+		elsif ($win->{'data_level'} == 1) { $hilight = '{sb_act_text '; }
+		elsif ($win->{'data_level'} == 2) { $hilight = '{sb_act_msg '; }
+		elsif ($colour             ne '') { $hilight = "{sb_act_hilight_color $colour "; }
+		elsif ($win->{'data_level'} == 3) { $hilight = '{sb_act_hilight '; }
+		else                              { $hilight = '{sb_act_special '; }
+
+		$number = $win->{'refnum'};
+		my @display = ('display_nokey');
+		if (defined $keymap{$number} and $keymap{$number} ne '') {
+			unshift @display, map { (my $cpy = $_) =~ s/_no/_/; $cpy } @display;
+		}
+		if (Irssi::active_win->{'refnum'} == $number) {
+			unshift @display, map { my $cpy = $_; $cpy .= '_active'; $cpy } @display;
+		}
+		#Irssi::print("win $number [@display]: " . join '.', split //, join '<<', map {
+			#		Irssi::settings_get_str(set $_) } @display);
+		$display = (grep { $_ }
+			map { Irssi::settings_get_str(set $_) }
+			@display)[0];
+			#Irssi::print("win $number : " . join '.', split //, $display);
+
+		if ($SCREEN_MODE or Irssi::settings_get_bool(set 'sbar_maxlength')
+				or ($block < 0)
+		) {
+			my $baseLength = sb_length(ir_escape(ir_ve(ir_parse_special_protected(sb_ctfe(
+				'{sb_background}' . expand($display,
+				C => ir_fe('x'),
+				N => $number . (' 'x($numPad - length($number))),
+				Q => ir_fe((' 'x($keyPad - length($keymap{$number}))) . $keymap{$number}),
+				H => $hilight,
+				S => '}{sb_background}'
+			), 1), $win)))) - 1;
+			my $diff = abs($block) - (length($name) + $baseLength);
+			if ($diff < 0) { # too long
+				if (abs($diff) >= length($name)) { $name = '' } # forget it
+				elsif (abs($diff) + 1 >= length($name)) { $name = substr($name,
+						0, 1); }
+				else {
+					my $middle = exists $abbrevList{$name} ?
+					(($abbrevList{$name} + (2*(length($name) / 2)))/3) :
+						((Irssi::settings_get_str('fancy_abbrev') =~ /^head/i) ?
+								length($name) :
+						(length($name) / 2));
+					my $cut = int($middle - (abs($diff) / 2) + .55); 
+					$cut = 1 if $cut < 1;
+					$cut = length($name) - abs($diff) - 1 if $cut > (length($name) -
+						abs($diff) - 1);
+					$name = substr($name, 0, $cut) . '~' . substr($name, $cut +
+						abs($diff) + 1);
+				}
+			}
+			elsif ($SCREEN_MODE or ($block < 0)) {
+				$name .= (' ' x $diff);
+			}
+		}
+
+		my $add = ir_ve(ir_parse_special_protected(sb_ctfe('{sb_background}' . expand($display,
+			C => ir_fe($name),
+			N => $number . (' 'x($numPad - length($number))),
+			Q => ir_fe((' 'x($keyPad - length($keymap{$number}))) . $keymap{$number}),
+			H => $hilight,
+			S => '}{sb_background}'
+		), 1), $win));
+		if ($SCREEN_MODE) {
+			$actString->[$line] = $add;
+			if ((!defined $oldActString->[$line]
+					or $oldActString->[$line] ne $actString->[$line])
+					and
+				$line <= ($columns * $height)
+			) {
+				print STDERR $screenansi->dcs().
+								 $terminfo->cup(($line-1) % $height+1, $width + (
+									 abs($block) * int(($line-1) / $height))).
+				formats_to_ansi_basic(sb_expand(ir_escape($actString->[$line]))).
+								#$terminfo->el().
+								 $screenansi->st();
+			}
+			$line++;
+		}
+		else {
+			#$temp =~ s/\{\S+?(?:\s(.*?))?\}/$1/g;
+			#$temp =~ s/\\\\\\\\/\\/g; # XXX I'm actually guessing here, someone point me
+			#                          # XXX to docs please
+			$actString->[$line] = '' unless defined $actString->[$line];
+
+			# XXX how can I check whether the content still fits in the bar? this would
+			# XXX allow awlstatus to reside on a statusbar together with other items...
+			if (sb_length(ir_escape($actString->[$line] . $add)) >= $width) {
+				# XXX doesn't correctly handle utf-8 multibyte ... help !!?
+				$actString->[$line] .= ' ' x ($width - sb_length(ir_escape(
+					$actString->[$line])));
+				$line++;
+			}
+			$actString->[$line] .= $add . $separator;
+			# XXX if I use these prints, output layout gets screwed up... why ?
+			#Irssi::print("line $line: ".$actString->[$line]);
+			#Irssi::print("temp $line: ".$temp);
+		}
+	}
+
+	if ($SCREEN_MODE) {
+		while ($line <= ($columns * $height)) {
+			print STDERR $screenansi->dcs().
+							 $terminfo->cup(($line-1) % $height+1, $width + (
+								 abs($block) * int(($line-1) / $height))).
+							 $terminfo->el().
+							 $screenansi->st();
+			$line++;
+		}
+		print STDERR $screenansi->dcs().
+						 $terminfo->rc().
+		             $terminfo->cnorm().
+						 $screenansi->st();
+	}
+	else {
+		# XXX the Irssi::print statements lead to the MOST WEIRD results
+		# e.g.: the loop gets executed TWICE for p > 0 ?!?
+		for (my $p = 0; $p < @$actString; $p++) { # wrap each line in {sb }, escape it
+			my $x = $actString->[$p];              # properly, etc.
+			$x =~ s/\Q$separator\E([ ]*)$/$1/;
+			#Irssi::print("[$p]".'current:'.join'.',split//,sb_strip(ir_escape($x,0)));
+			#Irssi::print("assumed length before:".sb_length(ir_escape($x,0)));
+			$x = "{sb $x}";
+			#Irssi::print("[$p]".'new:'.join'.',split//,sb_expand(ir_escape($x,0)));
+			#Irssi::print("[$p]".'new:'.join'.',split//,ir_escape($x,0));
+			#Irssi::print("assumed length after:".sb_length(ir_escape($x,0)));
+			$x = ir_escape($x);
+			#Irssi::print("[$p]".'REALnew:'.join'.',split//,sb_strip($x));
+			$actString->[$p] = $x;
+			# XXX any Irssi::print debug statement leads to SEGFAULT (sometimes) - why ?
+		}
+	}
+	#Irssi::print("remake [ $xx ] finished");
+}
+
+sub awlHasChanged () {
+	$globTime = undef;
+	my $temp = ($SCREEN_MODE ?
+		"\\\n" . Irssi::settings_get_int(set 'block').
+		Irssi::settings_get_int(set 'height_adjust')
+		: "!\n" . Irssi::settings_get_str(set 'placement').
+		Irssi::settings_get_int(set 'position')).
+		Irssi::settings_get_str(set 'automode');
+	if ($temp ne $resetNeeded) { wlreset(); return; }
+	#Irssi::print("awl has changed, calls to remake so far: $callcount");
+	$needRemake = 1;
+
+	#remake();
+	if (
+		($SCREEN_MODE and !$DISABLE_SCREEN_TEMP)
+			or
+		($needRemake and Irssi::settings_get_bool(set 'all_disable'))
+			or
+		(!Irssi::settings_get_bool(set 'all_disable') and $currentLines < 1)
+	) {
+		$needRemake = undef;
+		remake();
+	}
+
+	unless ($SCREEN_MODE) {
+		# XXX Irssi crashes if I try to do this without timer, why ? What's the minimum
+		# XXX delay I need to use in the timer ?
+		Irssi::timeout_add_once(100, 'syncLines', undef);
+
+		for (keys %statusbars) {
+			Irssi::statusbar_items_redraw(set$_);
+		}
+	}
+	else {
+		Irssi::timeout_add_once(100, 'syncColumns', undef);
+	}
+}
+
+sub eventChanged () { # Implement a change queue/blocker -.-)
+	if (defined $globTime) {
+		Irssi::timeout_remove($globTime);
+	} # delay the update further
+	$globTime = Irssi::timeout_add_once(GLOB_QUEUE_TIMER, 'awlHasChanged', undef);
+}
+
+# }}}
+
+
+# {{{ screen mode
+
+sub screenFullRedraw {
+	my ($window) = @_;
+	if (!ref $window or $window->{'refnum'} == Irssi::active_win->{'refnum'}) {
+		$actString = [];
+		eventChanged();
+	}
+}
+
+sub screenSize { # from nicklist.pl
+	$screenResizing = 1;
+	# fit screen
+	system 'screen -x '.$ENV{'STY'}.' -X fit';
+	# get size
+	my ($row, $col) = split ' ', `stty size`;
+	# set screen width
+	$screenWidth = $col-1;
+	$screenHeight = $row-1;
+	
+	# on some recent systems, "screen -X fit; screen -X width -w 50" doesn't work, needs a sleep in between the 2 commands
+	# so we wait a second before setting the width
+	Irssi::timeout_add_once(100, sub {
+		my ($new_irssi_width) = @_;
+		$new_irssi_width -= abs(Irssi::settings_get_int(set
+				'block'))*$currentColumns - 1;
+		system 'screen -x '.$ENV{'STY'}.' -X width -w ' . $new_irssi_width;
+		# and then we wait another second for the resizing, and then redraw.
+		Irssi::timeout_add_once(10,sub {$screenResizing = 0; screenFullRedraw()}, []);
+	}, $screenWidth);
+}
+
+sub screenOff {
+	my ($unloadMode) = @_;
+	Irssi::signal_remove('gui print text finished' => 'screenFullRedraw');
+	Irssi::signal_remove('gui page scrolled' => 'screenFullRedraw');
+	Irssi::signal_remove('window changed' => 'screenFullRedraw');
+	Irssi::signal_remove('window changed automatic' => 'screenFullRedraw');
+	if ($unloadMode) {
+		Irssi::signal_remove('terminal resized' => 'resizeTerm');
+	}
+	system 'screen -x '.$ENV{'STY'}.' -X fit';
+}
+
+sub syncColumns {
+	return if (@$actString == 0);
+	my $temp = $currentColumns;
+	#Irssi::print("current columns $temp");
+	my $height = $screenHeight - abs(Irssi::settings_get_int(set
+			'height_adjust'));
+	$currentColumns = int(($#$actString-1) / $height) + 1;
+	#Irssi::print("objects in actstring:".scalar(@$actString).", screen height:".
+	#	$height);
+	my $currMaxColumns = Irssi::settings_get_int(set 'columns');
+	if ($currMaxColumns > 0 and $currentColumns > $currMaxColumns) {
+		$currentColumns = $currMaxColumns;
+	}
+	elsif ($currMaxColumns < 0) {
+		$currentColumns = abs($currMaxColumns);
+	}
+	return if ($temp == $currentColumns);
+	screenSize();
+}
+
+#$needRemake = 1;
+sub resizeTerm () {
+	if ($SCREEN_MODE and !$screenResizing) {
+		$screenResizing = 1;
+		Irssi::timeout_add_once(10, 'screenSize', undef);
+	}
+	Irssi::timeout_add_once(100, 'eventChanged', undef);
+}
+
+# }}}
+
+
+# {{{ settings add
+
+Irssi::settings_add_str(setc, set 'display_nokey', '[$N]$H$C$S');
+Irssi::settings_add_str(setc, set 'display_key', '[$Q=$N]$H$C$S');
+Irssi::settings_add_str(setc, set 'display_nokey_active', '');
+Irssi::settings_add_str(setc, set 'display_key_active', '');
+Irssi::settings_add_str(setc, set 'separator', "\\ ");
+Irssi::settings_add_bool(setc, set 'prefer_name', 0);
+Irssi::settings_add_int(setc, set 'hide_data', 0);
+Irssi::settings_add_int(setc, set 'maxlines', 9);
+Irssi::settings_add_int(setc, set 'columns', 1);
+Irssi::settings_add_int(setc, set 'block', 20);
+Irssi::settings_add_bool(setc, set 'sbar_maxlength', 0);
+Irssi::settings_add_int(setc, set 'height_adjust', 2);
+Irssi::settings_add_str(setc, set 'sort', 'refnum');
+Irssi::settings_add_str(setc, set 'placement', 'bottom');
+Irssi::settings_add_int(setc, set 'position', 0);
+Irssi::settings_add_bool(setc, set 'all_disable', 0);
+Irssi::settings_add_str(setc, set 'automode', 'sbar');
+
+# }}}
+
+
+# {{{ init
+
+sub wlreset {
+	$actString = [];
+	$currentLines = 0; # 1; # mhmmmm .. we actually enable one line down there so
+	                        # let's try this.
+	#update_keymap();
+	killOldStatus();
+	# Register statusbar
+	#add_statusbar(0);
+	#Irssi::command('statusbar wl0 enable');
+	my $was_screen_mode = $SCREEN_MODE;
+	if ($SCREEN_MODE = (Irssi::settings_get_str(set 'automode') =~ /screen/i)
+			and
+		!$was_screen_mode
+	) {
+		if (!defined $ENV{'STY'}) {
+			Irssi::print('Screen mode can only be used in GNU screen but no '.
+				'screen was found.', MSGLEVEL_CLIENTERROR);
+			$SCREEN_MODE = undef;
+		}
+		else {
+			Irssi::signal_add_last('gui print text finished' => 'screenFullRedraw');
+			Irssi::signal_add_last('gui page scrolled' => 'screenFullRedraw');
+			Irssi::signal_add('window changed' => 'screenFullRedraw');
+			Irssi::signal_add('window changed automatic' => 'screenFullRedraw');
+		}
+	}
+	elsif ($was_screen_mode and !$SCREEN_MODE) {
+		screenOff();
+	}
+	$resetNeeded = ($SCREEN_MODE ?
+		"\\\n" . Irssi::settings_get_int(set 'block').
+		Irssi::settings_get_int(set 'height_adjust')
+		: "!\n" . Irssi::settings_get_str(set 'placement').
+		Irssi::settings_get_int(set 'position')).
+		Irssi::settings_get_str(set 'automode');
+	resizeTerm();
+}
+
+wlreset();
+
+# }}}
+
+
+# {{{ unload/deinit
+
+my $Unload;
+sub unload ($$$) {
+	$Unload = 1;
+	# pretend we didn't do anything ASAP
+	Irssi::timeout_add_once(10, sub { $Unload = undef; }, undef);
+}
+# last try to catch a sigsegv
+Irssi::signal_add_first('gui exit' => sub { $Unload = undef; });
+sub UNLOAD {
+	# this might well crash Irssi... try /eval /script unload someotherscript ;
+	# /quit (= SEGFAULT !)
+	if ($Unload) {
+		$actString = ['']; # syncLines(); # XXX Irssi crashes when trying to disable
+		killOldStatus();                  # XXX all statusbars ?
+		if ($SCREEN_MODE) {
+			screenOff('unload mode');
+		}
+	}
+}
+
+# }}}
+
+
+# {{{ signals
+
+sub addPrintTextHook { # update on print text
+	return if $_[0]->{'level'} == 262144 and $_[0]->{'target'} eq ''
+			and !defined($_[0]->{'server'});
+	if (Irssi::settings_get_str(set 'sort') =~ /^[-!]?last_line$/) {
+		Irssi::timeout_add_once(100, 'eventChanged', undef);
+	}
+}
+
+#sub _x { my ($x, $y) = @_; ($x, sub { Irssi::print('-->signal '.$x); eval "$y();"; }) }
+#sub _x { @_ }
+Irssi::signal_add_first(
+	'command script unload' => 'unload'
+);
+Irssi::signal_add_last({
+	'setup changed' => 'eventChanged',
+	'print text' => 'addPrintTextHook',
+	'terminal resized' => 'resizeTerm',
+	'setup reread' => 'wlreset',
+	'window hilight' => 'eventChanged',
+});
+Irssi::signal_add({
+	'window created' => 'eventChanged',
+	'window destroyed' => 'eventChanged',
+	'window name changed' => 'eventChanged',
+	'window refnum changed' => 'eventChanged',
+	'window changed' => 'eventChanged',
+	'window changed automatic' => 'eventChanged',
+});
+
+#Irssi::signal_add('nick mode changed', 'chanactHasChanged'); # relicts
+
+# }}}
+
+# {{{ commands
+
+
+sub runsub {
+	my ($cmd) = @_;
+	sub {
+		my ($data, $server, $item) = @_;
+		Irssi::command_runsub($cmd, $data, $server, $item);
+	};
+}
+Irssi::command_bind( setc() => runsub(setc()) );
+Irssi::command_bind( setc() . ' paste' => runsub(setc() . ' paste') );
+Irssi::command_bind(
+	setc() . ' paste on' => sub {
+		return unless $SCREEN_MODE;
+		my $was_disabled = $DISABLE_SCREEN_TEMP;
+		$DISABLE_SCREEN_TEMP = 1;
+		Irssi::print('Paste mode is now ON, '.uc(setc()).' is temporarily '.
+		             'disabled.');
+		if (!$was_disabled) {
+			$screenResizing = 1;
+			screenOff();
+		}
+	}
+);
+Irssi::command_bind(
+	setc() . ' paste off' => sub {
+		return unless $SCREEN_MODE;
+		my $was_disabled = $DISABLE_SCREEN_TEMP;
+		$DISABLE_SCREEN_TEMP = undef;
+		Irssi::print('Paste mode is now OFF, '.uc(setc()).' is enabled.');
+		if ($was_disabled) {
+			$SCREEN_MODE = undef;
+			$screenResizing = 0;
+			wlreset();
+		}
+	}
+);
+Irssi::command_bind(
+	setc() . ' paste toggle' => sub {
+		if ($DISABLE_SCREEN_TEMP) {
+			Irssi::command(setc() . ' paste off');
+		}
+		else {
+			Irssi::command(setc() . ' paste on');
+		}
+	}
+);
+Irssi::command_bind(
+	setc() . ' redraw' => sub {
+		return unless $SCREEN_MODE;
+		screenFullRedraw();
+	}
+);
+		
+
+# }}}
+
+# {{{ Algorithm::LCSS module
+{
+	package Algorithm::Diff;
+	# Skip to first "=head" line for documentation.
+	use strict;
+
+	use integer;    # see below in _replaceNextLargerWith() for mod to make
+						 # if you don't use this
+
+	# McIlroy-Hunt diff algorithm
+	# Adapted from the Smalltalk code of Mario I. Wolczko, <mario@wolczko.com>
+	# by Ned Konz, perl@bike-nomad.com
+	# Updates by Tye McQueen, http://perlmonks.org/?node=tye
+
+	# Create a hash that maps each element of $aCollection to the set of
+	# positions it occupies in $aCollection, restricted to the elements
+	# within the range of indexes specified by $start and $end.
+	# The fourth parameter is a subroutine reference that will be called to
+	# generate a string to use as a key.
+	# Additional parameters, if any, will be passed to this subroutine.
+	#
+	# my $hashRef = _withPositionsOfInInterval( \@array, $start, $end, $keyGen );
+
+	sub _withPositionsOfInInterval
+	{
+		 my $aCollection = shift;    # array ref
+		 my $start       = shift;
+		 my $end         = shift;
+		 my $keyGen      = shift;
+		 my %d;
+		 my $index;
+		 for ( $index = $start ; $index <= $end ; $index++ )
+		 {
+			  my $element = $aCollection->[$index];
+			  my $key = &$keyGen( $element, @_ );
+			  if ( exists( $d{$key} ) )
+			  {
+					unshift ( @{ $d{$key} }, $index );
+			  }
+			  else
+			  {
+					$d{$key} = [$index];
+			  }
+		 }
+		 return wantarray ? %d : \%d;
+	}
+
+	# Find the place at which aValue would normally be inserted into the
+	# array. If that place is already occupied by aValue, do nothing, and
+	# return undef. If the place does not exist (i.e., it is off the end of
+	# the array), add it to the end, otherwise replace the element at that
+	# point with aValue.  It is assumed that the array's values are numeric.
+	# This is where the bulk (75%) of the time is spent in this module, so
+	# try to make it fast!
+
+	sub _replaceNextLargerWith
+	{
+		 my ( $array, $aValue, $high ) = @_;
+		 $high ||= $#$array;
+
+		 # off the end?
+		 if ( $high == -1 || $aValue > $array->[-1] )
+		 {
+			  push ( @$array, $aValue );
+			  return $high + 1;
+		 }
+
+		 # binary search for insertion point...
+		 my $low = 0;
+		 my $index;
+		 my $found;
+		 while ( $low <= $high )
+		 {
+			  $index = ( $high + $low ) / 2;
+
+			  # $index = int(( $high + $low ) / 2);  # without 'use integer'
+			  $found = $array->[$index];
+
+			  if ( $aValue == $found )
+			  {
+					return undef;
+			  }
+			  elsif ( $aValue > $found )
+			  {
+					$low = $index + 1;
+			  }
+			  else
+			  {
+					$high = $index - 1;
+			  }
+		 }
+
+		 # now insertion point is in $low.
+		 $array->[$low] = $aValue;    # overwrite next larger
+		 return $low;
+	}
+
+	# This method computes the longest common subsequence in $a and $b.
+
+	# Result is array or ref, whose contents is such that
+	#   $a->[ $i ] == $b->[ $result[ $i ] ]
+	# foreach $i in ( 0 .. $#result ) if $result[ $i ] is defined.
+
+	# An additional argument may be passed; this is a hash or key generating
+	# function that should return a string that uniquely identifies the given
+	# element.  It should be the case that if the key is the same, the elements
+	# will compare the same. If this parameter is undef or missing, the key
+	# will be the element as a string.
+
+	# By default, comparisons will use "eq" and elements will be turned into keys
+	# using the default stringizing operator '""'.
+
+	# Additional parameters, if any, will be passed to the key generation
+	# routine.
+
+	sub _longestCommonSubsequence
+	{
+		 my $a        = shift;    # array ref or hash ref
+		 my $b        = shift;    # array ref or hash ref
+		 my $counting = shift;    # scalar
+		 my $keyGen   = shift;    # code ref
+		 my $compare;             # code ref
+
+		 if ( ref($a) eq 'HASH' )
+		 {                        # prepared hash must be in $b
+			  my $tmp = $b;
+			  $b = $a;
+			  $a = $tmp;
+		 }
+
+		 # Check for bogus (non-ref) argument values
+		 if ( !ref($a) || !ref($b) )
+		 {
+			  my @callerInfo = caller(1);
+			  die 'error: must pass array or hash references to ' . $callerInfo[3];
+		 }
+
+		 # set up code refs
+		 # Note that these are optimized.
+		 if ( !defined($keyGen) )    # optimize for strings
+		 {
+			  $keyGen = sub { $_[0] };
+			  $compare = sub { my ( $a, $b ) = @_; $a eq $b };
+		 }
+		 else
+		 {
+			  $compare = sub {
+					my $a = shift;
+					my $b = shift;
+					&$keyGen( $a, @_ ) eq &$keyGen( $b, @_ );
+			  };
+		 }
+
+		 my ( $aStart, $aFinish, $matchVector ) = ( 0, $#$a, [] );
+		 my ( $prunedCount, $bMatches ) = ( 0, {} );
+
+		 if ( ref($b) eq 'HASH' )    # was $bMatches prepared for us?
+		 {
+			  $bMatches = $b;
+		 }
+		 else
+		 {
+			  my ( $bStart, $bFinish ) = ( 0, $#$b );
+
+			  # First we prune off any common elements at the beginning
+			  while ( $aStart <= $aFinish
+					and $bStart <= $bFinish
+					and &$compare( $a->[$aStart], $b->[$bStart], @_ ) )
+			  {
+					$matchVector->[ $aStart++ ] = $bStart++;
+					$prunedCount++;
+			  }
+
+			  # now the end
+			  while ( $aStart <= $aFinish
+					and $bStart <= $bFinish
+					and &$compare( $a->[$aFinish], $b->[$bFinish], @_ ) )
+			  {
+					$matchVector->[ $aFinish-- ] = $bFinish--;
+					$prunedCount++;
+			  }
+
+			  # Now compute the equivalence classes of positions of elements
+			  $bMatches =
+				 _withPositionsOfInInterval( $b, $bStart, $bFinish, $keyGen, @_ );
+		 }
+		 my $thresh = [];
+		 my $links  = [];
+
+		 my ( $i, $ai, $j, $k );
+		 for ( $i = $aStart ; $i <= $aFinish ; $i++ )
+		 {
+			  $ai = &$keyGen( $a->[$i], @_ );
+			  if ( exists( $bMatches->{$ai} ) )
+			  {
+					$k = 0;
+					for $j ( @{ $bMatches->{$ai} } )
+					{
+
+						 # optimization: most of the time this will be true
+						 if ( $k and $thresh->[$k] > $j and $thresh->[ $k - 1 ] < $j )
+						 {
+							  $thresh->[$k] = $j;
+						 }
+						 else
+						 {
+							  $k = _replaceNextLargerWith( $thresh, $j, $k );
+						 }
+
+						 # oddly, it's faster to always test this (CPU cache?).
+						 if ( defined($k) )
+						 {
+							  $links->[$k] =
+								 [ ( $k ? $links->[ $k - 1 ] : undef ), $i, $j ];
+						 }
+					}
+			  }
+		 }
+
+		 if (@$thresh)
+		 {
+			  return $prunedCount + @$thresh if $counting;
+			  for ( my $link = $links->[$#$thresh] ; $link ; $link = $link->[0] )
+			  {
+					$matchVector->[ $link->[1] ] = $link->[2];
+			  }
+		 }
+		 elsif ($counting)
+		 {
+			  return $prunedCount;
+		 }
+
+		 return wantarray ? @$matchVector : $matchVector;
+	}
+
+	sub traverse_sequences
+	{
+		 my $a                 = shift;          # array ref
+		 my $b                 = shift;          # array ref
+		 my $callbacks         = shift || {};
+		 my $keyGen            = shift;
+		 my $matchCallback     = $callbacks->{'MATCH'} || sub { };
+		 my $discardACallback  = $callbacks->{'DISCARD_A'} || sub { };
+		 my $finishedACallback = $callbacks->{'A_FINISHED'};
+		 my $discardBCallback  = $callbacks->{'DISCARD_B'} || sub { };
+		 my $finishedBCallback = $callbacks->{'B_FINISHED'};
+		 my $matchVector = _longestCommonSubsequence( $a, $b, 0, $keyGen, @_ );
+
+		 # Process all the lines in @$matchVector
+		 my $lastA = $#$a;
+		 my $lastB = $#$b;
+		 my $bi    = 0;
+		 my $ai;
+
+		 for ( $ai = 0 ; $ai <= $#$matchVector ; $ai++ )
+		 {
+			  my $bLine = $matchVector->[$ai];
+			  if ( defined($bLine) )    # matched
+			  {
+					&$discardBCallback( $ai, $bi++, @_ ) while $bi < $bLine;
+					&$matchCallback( $ai,    $bi++, @_ );
+			  }
+			  else
+			  {
+					&$discardACallback( $ai, $bi, @_ );
+			  }
+		 }
+
+		 # The last entry (if any) processed was a match.
+		 # $ai and $bi point just past the last matching lines in their sequences.
+
+		 while ( $ai <= $lastA or $bi <= $lastB )
+		 {
+
+			  # last A?
+			  if ( $ai == $lastA + 1 and $bi <= $lastB )
+			  {
+					if ( defined($finishedACallback) )
+					{
+						 &$finishedACallback( $lastA, @_ );
+						 $finishedACallback = undef;
+					}
+					else
+					{
+						 &$discardBCallback( $ai, $bi++, @_ ) while $bi <= $lastB;
+					}
+			  }
+
+			  # last B?
+			  if ( $bi == $lastB + 1 and $ai <= $lastA )
+			  {
+					if ( defined($finishedBCallback) )
+					{
+						 &$finishedBCallback( $lastB, @_ );
+						 $finishedBCallback = undef;
+					}
+					else
+					{
+						 &$discardACallback( $ai++, $bi, @_ ) while $ai <= $lastA;
+					}
+			  }
+
+			  &$discardACallback( $ai++, $bi, @_ ) if $ai <= $lastA;
+			  &$discardBCallback( $ai, $bi++, @_ ) if $bi <= $lastB;
+		 }
+
+		 return 1;
+	}
+
+	sub traverse_balanced
+	{
+		 my $a                 = shift;              # array ref
+		 my $b                 = shift;              # array ref
+		 my $callbacks         = shift || {};
+		 my $keyGen            = shift;
+		 my $matchCallback     = $callbacks->{'MATCH'} || sub { };
+		 my $discardACallback  = $callbacks->{'DISCARD_A'} || sub { };
+		 my $discardBCallback  = $callbacks->{'DISCARD_B'} || sub { };
+		 my $changeCallback    = $callbacks->{'CHANGE'};
+		 my $matchVector = _longestCommonSubsequence( $a, $b, 0, $keyGen, @_ );
+
+		 # Process all the lines in match vector
+		 my $lastA = $#$a;
+		 my $lastB = $#$b;
+		 my $bi    = 0;
+		 my $ai    = 0;
+		 my $ma    = -1;
+		 my $mb;
+
+		 while (1)
+		 {
+
+			  # Find next match indices $ma and $mb
+			  do {
+					$ma++;
+			  } while(
+						 $ma <= $#$matchVector
+					&&  !defined $matchVector->[$ma]
+			  );
+
+			  last if $ma > $#$matchVector;    # end of matchVector?
+			  $mb = $matchVector->[$ma];
+
+			  # Proceed with discard a/b or change events until
+			  # next match
+			  while ( $ai < $ma || $bi < $mb )
+			  {
+
+					if ( $ai < $ma && $bi < $mb )
+					{
+
+						 # Change
+						 if ( defined $changeCallback )
+						 {
+							  &$changeCallback( $ai++, $bi++, @_ );
+						 }
+						 else
+						 {
+							  &$discardACallback( $ai++, $bi, @_ );
+							  &$discardBCallback( $ai, $bi++, @_ );
+						 }
+					}
+					elsif ( $ai < $ma )
+					{
+						 &$discardACallback( $ai++, $bi, @_ );
+					}
+					else
+					{
+
+						 # $bi < $mb
+						 &$discardBCallback( $ai, $bi++, @_ );
+					}
+			  }
+
+			  # Match
+			  &$matchCallback( $ai++, $bi++, @_ );
+		 }
+
+		 while ( $ai <= $lastA || $bi <= $lastB )
+		 {
+			  if ( $ai <= $lastA && $bi <= $lastB )
+			  {
+
+					# Change
+					if ( defined $changeCallback )
+					{
+						 &$changeCallback( $ai++, $bi++, @_ );
+					}
+					else
+					{
+						 &$discardACallback( $ai++, $bi, @_ );
+						 &$discardBCallback( $ai, $bi++, @_ );
+					}
+			  }
+			  elsif ( $ai <= $lastA )
+			  {
+					&$discardACallback( $ai++, $bi, @_ );
+			  }
+			  else
+			  {
+
+					# $bi <= $lastB
+					&$discardBCallback( $ai, $bi++, @_ );
+			  }
+		 }
+
+		 return 1;
+	}
+
+	sub prepare
+	{
+		 my $a       = shift;    # array ref
+		 my $keyGen  = shift;    # code ref
+
+		 # set up code ref
+		 $keyGen = sub { $_[0] } unless defined($keyGen);
+
+		 return scalar _withPositionsOfInInterval( $a, 0, $#$a, $keyGen, @_ );
+	}
+
+	sub LCS
+	{
+		 my $a = shift;                  # array ref
+		 my $b = shift;                  # array ref or hash ref
+		 my $matchVector = _longestCommonSubsequence( $a, $b, 0, @_ );
+		 my @retval;
+		 my $i;
+		 for ( $i = 0 ; $i <= $#$matchVector ; $i++ )
+		 {
+			  if ( defined( $matchVector->[$i] ) )
+			  {
+					push ( @retval, $a->[$i] );
+			  }
+		 }
+		 return wantarray ? @retval : \@retval;
+	}
+
+	sub LCS_length
+	{
+		 my $a = shift;                          # array ref
+		 my $b = shift;                          # array ref or hash ref
+		 return _longestCommonSubsequence( $a, $b, 1, @_ );
+	}
+
+	sub LCSidx
+	{
+		 my $a= shift @_;
+		 my $b= shift @_;
+		 my $match= _longestCommonSubsequence( $a, $b, 0, @_ );
+		 my @am= grep defined $match->[$_], 0..$#$match;
+		 my @bm= @{$match}[@am];
+		 return \@am, \@bm;
+	}
+
+	sub compact_diff
+	{
+		 my $a= shift @_;
+		 my $b= shift @_;
+		 my( $am, $bm )= LCSidx( $a, $b, @_ );
+		 my @cdiff;
+		 my( $ai, $bi )= ( 0, 0 );
+		 push @cdiff, $ai, $bi;
+		 while( 1 ) {
+			  while(  @$am  &&  $ai == $am->[0]  &&  $bi == $bm->[0]  ) {
+					shift @$am;
+					shift @$bm;
+					++$ai, ++$bi;
+			  }
+			  push @cdiff, $ai, $bi;
+			  last   if  ! @$am;
+			  $ai = $am->[0];
+			  $bi = $bm->[0];
+			  push @cdiff, $ai, $bi;
+		 }
+		 push @cdiff, 0+@$a, 0+@$b
+			  if  $ai < @$a || $bi < @$b;
+		 return wantarray ? @cdiff : \@cdiff;
+	}
+
+	sub diff
+	{
+		 my $a      = shift;    # array ref
+		 my $b      = shift;    # array ref
+		 my $retval = [];
+		 my $hunk   = [];
+		 my $discard = sub {
+			  push @$hunk, [ '-', $_[0], $a->[ $_[0] ] ];
+		 };
+		 my $add = sub {
+			  push @$hunk, [ '+', $_[1], $b->[ $_[1] ] ];
+		 };
+		 my $match = sub {
+			  push @$retval, $hunk
+					if 0 < @$hunk;
+			  $hunk = []
+		 };
+		 traverse_sequences( $a, $b,
+			  { MATCH => $match, DISCARD_A => $discard, DISCARD_B => $add }, @_ );
+		 &$match();
+		 return wantarray ? @$retval : $retval;
+	}
+
+	sub sdiff
+	{
+		 my $a      = shift;    # array ref
+		 my $b      = shift;    # array ref
+		 my $retval = [];
+		 my $discard = sub { push ( @$retval, [ '-', $a->[ $_[0] ], "" ] ) };
+		 my $add = sub { push ( @$retval, [ '+', "", $b->[ $_[1] ] ] ) };
+		 my $change = sub {
+			  push ( @$retval, [ 'c', $a->[ $_[0] ], $b->[ $_[1] ] ] );
+		 };
+		 my $match = sub {
+			  push ( @$retval, [ 'u', $a->[ $_[0] ], $b->[ $_[1] ] ] );
+		 };
+		 traverse_balanced(
+			  $a,
+			  $b,
+			  {
+					MATCH     => $match,
+					DISCARD_A => $discard,
+					DISCARD_B => $add,
+					CHANGE    => $change,
+			  },
+			  @_
+		 );
+		 return wantarray ? @$retval : $retval;
+	}
+
+	########################################
+	my $Root= __PACKAGE__;
+	package Algorithm::Diff::_impl;
+	use strict;
+
+	sub _Idx()  { 0 } # $me->[_Idx]: Ref to array of hunk indices
+					# 1   # $me->[1]: Ref to first sequence
+					# 2   # $me->[2]: Ref to second sequence
+	sub _End()  { 3 } # $me->[_End]: Diff between forward and reverse pos
+	sub _Same() { 4 } # $me->[_Same]: 1 if pos 1 contains unchanged items
+	sub _Base() { 5 } # $me->[_Base]: Added to range's min and max
+	sub _Pos()  { 6 } # $me->[_Pos]: Which hunk is currently selected
+	sub _Off()  { 7 } # $me->[_Off]: Offset into _Idx for current position
+	sub _Min() { -2 } # Added to _Off to get min instead of max+1
+
+	sub Die
+	{
+		 require Carp;
+		 Carp::confess( @_ );
+	}
+
+	sub _ChkPos
+	{
+		 my( $me )= @_;
+		 return   if  $me->[_Pos];
+		 my $meth= ( caller(1) )[3];
+		 Die( "Called $meth on 'reset' object" );
+	}
+
+	sub _ChkSeq
+	{
+		 my( $me, $seq )= @_;
+		 return $seq + $me->[_Off]
+			  if  1 == $seq  ||  2 == $seq;
+		 my $meth= ( caller(1) )[3];
+		 Die( "$meth: Invalid sequence number ($seq); must be 1 or 2" );
+	}
+
+	sub getObjPkg
+	{
+		 my( $us )= @_;
+		 return ref $us   if  ref $us;
+		 return $us . "::_obj";
+	}
+
+	sub new
+	{
+		 my( $us, $seq1, $seq2, $opts ) = @_;
+		 my @args;
+		 for( $opts->{keyGen} ) {
+			  push @args, $_   if  $_;
+		 }
+		 for( $opts->{keyGenArgs} ) {
+			  push @args, @$_   if  $_;
+		 }
+		 my $cdif= Algorithm::Diff::compact_diff( $seq1, $seq2, @args );
+		 my $same= 1;
+		 if(  0 == $cdif->[2]  &&  0 == $cdif->[3]  ) {
+			  $same= 0;
+			  splice @$cdif, 0, 2;
+		 }
+		 my @obj= ( $cdif, $seq1, $seq2 );
+		 $obj[_End] = (1+@$cdif)/2;
+		 $obj[_Same] = $same;
+		 $obj[_Base] = 0;
+		 my $me = bless \@obj, $us->getObjPkg();
+		 $me->Reset( 0 );
+		 return $me;
+	}
+
+	sub Reset
+	{
+		 my( $me, $pos )= @_;
+		 $pos= int( $pos || 0 );
+		 $pos += $me->[_End]
+			  if  $pos < 0;
+		 $pos= 0
+			  if  $pos < 0  ||  $me->[_End] <= $pos;
+		 $me->[_Pos]= $pos || !1;
+		 $me->[_Off]= 2*$pos - 1;
+		 return $me;
+	}
+
+	sub Base
+	{
+		 my( $me, $base )= @_;
+		 my $oldBase= $me->[_Base];
+		 $me->[_Base]= 0+$base   if  defined $base;
+		 return $oldBase;
+	}
+
+	sub Copy
+	{
+		 my( $me, $pos, $base )= @_;
+		 my @obj= @$me;
+		 my $you= bless \@obj, ref($me);
+		 $you->Reset( $pos )   if  defined $pos;
+		 $you->Base( $base );
+		 return $you;
+	}
+
+	sub Next {
+		 my( $me, $steps )= @_;
+		 $steps= 1   if  ! defined $steps;
+		 if( $steps ) {
+			  my $pos= $me->[_Pos];
+			  my $new= $pos + $steps;
+			  $new= 0   if  $pos  &&  $new < 0;
+			  $me->Reset( $new )
+		 }
+		 return $me->[_Pos];
+	}
+
+	sub Prev {
+		 my( $me, $steps )= @_;
+		 $steps= 1   if  ! defined $steps;
+		 my $pos= $me->Next(-$steps);
+		 $pos -= $me->[_End]   if  $pos;
+		 return $pos;
+	}
+
+	sub Diff {
+		 my( $me )= @_;
+		 $me->_ChkPos();
+		 return 0   if  $me->[_Same] == ( 1 & $me->[_Pos] );
+		 my $ret= 0;
+		 my $off= $me->[_Off];
+		 for my $seq ( 1, 2 ) {
+			  $ret |= $seq
+					if  $me->[_Idx][ $off + $seq + _Min ]
+					<   $me->[_Idx][ $off + $seq ];
+		 }
+		 return $ret;
+	}
+
+	sub Min {
+		 my( $me, $seq, $base )= @_;
+		 $me->_ChkPos();
+		 my $off= $me->_ChkSeq($seq);
+		 $base= $me->[_Base] if !defined $base;
+		 return $base + $me->[_Idx][ $off + _Min ];
+	}
+
+	sub Max {
+		 my( $me, $seq, $base )= @_;
+		 $me->_ChkPos();
+		 my $off= $me->_ChkSeq($seq);
+		 $base= $me->[_Base] if !defined $base;
+		 return $base + $me->[_Idx][ $off ] -1;
+	}
+
+	sub Range {
+		 my( $me, $seq, $base )= @_;
+		 $me->_ChkPos();
+		 my $off = $me->_ChkSeq($seq);
+		 if( !wantarray ) {
+			  return  $me->[_Idx][ $off ]
+					-   $me->[_Idx][ $off + _Min ];
+		 }
+		 $base= $me->[_Base] if !defined $base;
+		 return  ( $base + $me->[_Idx][ $off + _Min ] )
+			  ..  ( $base + $me->[_Idx][ $off ] - 1 );
+	}
+
+	sub Items {
+		 my( $me, $seq )= @_;
+		 $me->_ChkPos();
+		 my $off = $me->_ChkSeq($seq);
+		 if( !wantarray ) {
+			  return  $me->[_Idx][ $off ]
+					-   $me->[_Idx][ $off + _Min ];
+		 }
+		 return
+			  @{$me->[$seq]}[
+						 $me->[_Idx][ $off + _Min ]
+					..  ( $me->[_Idx][ $off ] - 1 )
+			  ];
+	}
+
+	sub Same {
+		 my( $me )= @_;
+		 $me->_ChkPos();
+		 return wantarray ? () : 0
+			  if  $me->[_Same] != ( 1 & $me->[_Pos] );
+		 return $me->Items(1);
+	}
+
+	my %getName;
+		 %getName= (
+			  same => \&Same,
+			  diff => \&Diff,
+			  base => \&Base,
+			  min  => \&Min,
+			  max  => \&Max,
+			  range=> \&Range,
+			  items=> \&Items, # same thing
+		 );
+
+	sub Get
+	{
+		 my $me= shift @_;
+		 $me->_ChkPos();
+		 my @value;
+		 for my $arg (  @_  ) {
+			  for my $word (  split ' ', $arg  ) {
+					my $meth;
+					if(     $word !~ /^(-?\d+)?([a-zA-Z]+)([12])?$/
+						 ||  not  $meth= $getName{ lc $2 }
+					) {
+						 Die( $Root, ", Get: Invalid request ($word)" );
+					}
+					my( $base, $name, $seq )= ( $1, $2, $3 );
+					push @value, scalar(
+						 4 == length($name)
+							  ? $meth->( $me )
+							  : $meth->( $me, $seq, $base )
+					);
+			  }
+		 }
+		 if(  wantarray  ) {
+			  return @value;
+		 } elsif(  1 == @value  ) {
+			  return $value[0];
+		 }
+		 Die( 0+@value, " values requested from ",
+			  $Root, "'s Get in scalar context" );
+	}
+
+
+	my $Obj= getObjPkg($Root);
+	no strict 'refs';
+
+	for my $meth (  qw( new getObjPkg )  ) {
+		 *{$Root."::".$meth} = \&{$meth};
+		 *{$Obj ."::".$meth} = \&{$meth};
+	}
+	for my $meth (  qw(
+		 Next Prev Reset Copy Base Diff
+		 Same Items Range Min Max Get
+		 _ChkPos _ChkSeq
+	)  ) {
+		 *{$Obj."::".$meth} = \&{$meth};
+	}
+
+};
+{
+	package Algorithm::LCSS;
+
+	use strict;
+	{
+		no strict 'refs';
+		*traverse_sequences = \&Algorithm::Diff::traverse_sequences;
+	}
+
+	sub _tokenize { [split //, $_[0]] }
+
+	sub CSS {
+		 my $is_array = ref $_[0] eq 'ARRAY' ? 1 : 0;
+		 my ( $seq1, $seq2, @match, $from_match );
+		 my $i = 0;
+		 if ( $is_array ) {
+			  $seq1 = $_[0];
+			  $seq2 = $_[1];
+			  traverse_sequences( $seq1, $seq2, {
+					MATCH => sub { push @{$match[$i]}, $seq1->[$_[0]]; $from_match = 1 },
+					DISCARD_A => sub { do{$i++; $from_match = 0} if $from_match },
+					DISCARD_B => sub { do{$i++; $from_match = 0} if $from_match },
+			  });
+		 }
+		 else {
+			  $seq1 = _tokenize($_[0]);
+			  $seq2 = _tokenize($_[1]);
+			  traverse_sequences( $seq1, $seq2, {
+					MATCH => sub { $match[$i] .= $seq1->[$_[0]]; $from_match = 1 },
+					DISCARD_A => sub { do{$i++; $from_match = 0} if $from_match },
+					DISCARD_B => sub { do{$i++; $from_match = 0} if $from_match },
+			  });
+		 }
+	  return \@match;
+	}
+
+	sub CSS_Sorted {
+		 my $match = CSS(@_);
+		 if ( ref $_[0] eq 'ARRAY' ) {
+			 @$match = map{$_->[0]}sort{$b->[1]<=>$a->[1]}map{[$_,scalar(@$_)]}@$match
+		 }
+		 else {
+			 @$match = map{$_->[0]}sort{$b->[1]<=>$a->[1]}map{[$_,length($_)]}@$match
+		 }
+	  return $match;
+	}
+
+	sub LCSS {
+		 my $is_array = ref $_[0] eq 'ARRAY' ? 1 : 0;
+		 my $css = CSS(@_);
+		 my $index;
+		 my $length = 0;
+		 if ( $is_array ) {
+			  for( my $i = 0; $i < @$css; $i++ ) {
+					next unless @{$css->[$i]}>$length;
+					$index = $i;
+					$length = @{$css->[$i]};
+			  }
+		 }
+		 else {
+			  for( my $i = 0; $i < @$css; $i++ ) {
+					next unless length($css->[$i])>$length;
+					$index = $i;
+					$length = length($css->[$i]);
+			  }
+		 }
+	  return $css->[$index];
+	}
+
+};
+# }}}
+#{{{ Class::Classless module
+{
+	package Class::Classless;
+	use strict;
+	use vars qw(@ISA);
+	use Carp;
+
+	@ISA = ();
+
+	###########################################################################
+
+	@Class::Classless::X::ISA = ();
+
+	###########################################################################
+	###########################################################################
+
+	sub Class::Classless::X::AUTOLOAD {
+	  # This's the big dispatcher.
+	  
+	  my $it = shift @_;
+	  my $m =  ($Class::Classless::X::AUTOLOAD =~ m/([^:]+)$/s ) 
+					 ? $1 : $Class::Classless::X::AUTOLOAD;
+
+	  croak "Can't call Class::Classless methods (like $m) without an object"
+		 unless ref $it;  # sanity, basically.
+
+	  my $prevstate;
+	  $prevstate = ${shift @_}
+		if scalar(@_) && defined($_[0]) &&
+			ref($_[0]) eq 'Class::Classless::CALLSTATE::SHIMMY'
+	  ;   # A shim!  we were called via $callstate->NEXT
+
+	  my $no_fail = $prevstate ? $prevstate->[3] : undef;
+	  my $i       = $prevstate ? ($prevstate->[1] + 1) : 0;
+		# where to start scanning
+	  my $lineage;
+
+	  # Get the linearization of the ISA tree
+	  if($prevstate) {
+		 $lineage = $prevstate->[2];
+	  } elsif(defined $it->{'ISA_CACHE'} and ref $it->{'ISA_CACHE'} ){
+		 $lineage = $it->{'ISA_CACHE'};
+	  } else {
+		 $lineage = [ &Class::Classless::X::ISA_TREE($it) ];
+	  }
+
+	  # Was:
+	  #my @lineage =
+	  #  $prevstate ? @{$prevstate->[2]}
+	  #             : &Class::Classless::X::ISA_TREE($it);
+	  # # Get the linearization of the ISA tree
+	  # # ISA-memoization happens in the ISA_TREE function.
+	  
+	  for(; $i < @$lineage; ++$i) {
+
+		 if( !defined($no_fail) and exists($lineage->[$i]{'NO_FAIL'}) ) {
+			$no_fail = ($lineage->[$i]{'NO_FAIL'} || 0);
+			# so the first NO_FAIL sets it
+		 }
+
+		 if(     ref($lineage->[$i]{'METHODS'}     || 0)  # sanity
+			&& exists($lineage->[$i]{'METHODS'}{$m})
+		 ){
+			# We found what we were after.  Now see what to do with it.
+			my $v = $lineage->[$i]{'METHODS'}{$m};
+			return $v unless defined $v and ref $v;
+
+			if(ref($v) eq 'CODE') { # normal case, I expect!
+			  # Used to have copying of the arglist here.
+			  #  But it was apparently useless, so I deleted it
+			  unshift @_, 
+				 $it,                   # $_[0]    -- target object
+				 # a NEW callstate
+				 bless([$m, $i, $lineage, $no_fail, $prevstate ? 1 : 0],
+						 'Class::Classless::CALLSTATE'
+						),                # $_[1]    -- the callstate
+			  ;
+			  goto &{ $v }; # yes, magic goto!  bimskalabim!
+			}
+			return @$v if ref($v) eq '_deref_array';
+			return $$v if ref($v) eq '_deref_scalar';
+			return $v; # fallthru
+		 }
+	  }
+
+	  if($m eq 'DESTROY') { # mitigate DESTROY-lookup failure at global destruction
+		 # should be impossible
+	  } else {
+		 if($no_fail || 0) {
+			return;
+		 }
+		 croak "Can't find ", $prevstate ? 'NEXT method' : 'method',
+				 " $m in ", $it->{'NAME'} || $it,
+				 " or any ancestors\n";
+	  }
+	}
+
+	###########################################################################
+	###########################################################################
+
+	sub Class::Classless::X::DESTROY {
+	  # noop
+	}
+
+	###########################################################################
+	sub Class::Classless::X::ISA_TREE {
+	  # The linearizer!
+	  # Returns the search path for $_[0], starting with $_[0]
+	  # Possibly memoized.
+
+	  # I stopped being able to understand this algorithm about five
+	  #  minutes after I wrote it.
+	  use strict;
+	  
+	  my $set_cache = 0; # flag to set the cache on the way out
+	  
+	  if(exists($_[0]{'ISA_CACHE'})) {
+		 return    @{$_[0]{'ISA_CACHE'}}
+		  if defined $_[0]{'ISA_CACHE'}
+			  and ref $_[0]{'ISA_CACHE'};
+		  
+		 # Otherwise, if exists but is not a ref, it's a signal that it should
+		 #  be replaced at the earliest, with a listref
+		 $set_cache = 1;
+	  }
+	  
+	  my $has_mi = 0; # set to 0 on the first node we see with 2 parents!
+	  # First, just figure out what's in the tree.
+	  my %last_child = ($_[0] => 1); # as if already seen
+
+	  # if $last_child{$x} == $y, that means:
+	  #  1) incidentally, we've passed the node $x before.
+	  #  2) $x is the last child of $y,
+	  #     so that means that $y can be pushed to the stack only after
+	  #      we've pushed $x to the stack.
+	  
+	  my @tree_nodes;
+	  {
+		 my $current;
+		 my @in_stack = ($_[0]);
+		 while(@in_stack) {
+			next unless
+			 defined($current = shift @in_stack)
+			 && ref($current) # sanity
+			 && ref($current->{'PARENTS'} || 0) # sanity
+			;
+
+			push @tree_nodes, $current;
+
+			$has_mi = 1 if @{$current->{'PARENTS'}} > 1;
+			unshift
+			  @in_stack,
+			  map {
+				 if(exists $last_child{$_}) { # seen before!
+					$last_child{$_} = $current;
+					(); # seen -- don't re-explore
+				 } else { # first time seen
+					$last_child{$_} = $current;
+					$_; # first time seen -- explore now
+				 }
+			  }
+			  @{$current->{'PARENTS'}}
+			;
+		 }
+
+		 # If there was no MI, then that first scan was sufficient.
+		 unless($has_mi) {
+			$_[0]{'ISA_CACHE'} = \@tree_nodes if $set_cache;
+			return @tree_nodes;
+		 }
+
+		 # Otherwise, toss this list and rescan, consulting %last_child
+	  }
+
+	  # $last_child{$parent} holds the last (or only) child of $parent
+	  # in this tree.  When walking the tree this time, only that
+	  # child is authorized to put its parent on the @in_stack.
+	  # And that's the only way a node can get added to @in_stack,
+	  # except for $_[0] (the start node) being there at the beginning.
+
+	  # Now, walk again, but this time exploring parents the LAST
+	  # time seen in the tree, not the first.
+
+	  my @out;
+	  {
+		 my $current;
+		 my @in_stack = ($_[0]);
+		 while(@in_stack) {
+			next unless defined($current = shift @in_stack) && ref($current);
+			push @out, $current; # finally.
+			unshift
+			  @in_stack,
+			  grep(
+				 (
+					defined($_) # sanity
+					&& ref($_)  # sanity
+					&& $last_child{$_} eq $current,
+				 ),
+				 # I'm lastborn (or onlyborn) of this parent
+				 # so it's OK to explore now
+				 @{$current->{'PARENTS'}}
+			  )
+			 if ref($current->{'PARENTS'} || 0) # sanity
+			;
+		 }
+
+		 unless(scalar(@out) == scalar(keys(%last_child))) {
+			# the counts should be equal
+			my %good_ones;
+			@good_ones{@out} = ();
+			croak
+			  "ISA tree for " .
+			  ($_[0]{'NAME'} || $_[0]) .
+			  " is apparently cyclic, probably involving the nodes " .
+			  nodelist( grep { ref($_) && !exists $good_ones{$_} }
+				 values(%last_child) )
+			  . "\n";
+		 }
+	  }
+	  #print "Contents of out: ", nodelist(@out), "\n";
+	  
+	  $_[0]{'ISA_CACHE'} = \@out if $set_cache;
+	  return @out;
+	}
+
+	###########################################################################
+
+	sub Class::Classless::X::can { # NOT like UNIVERSAL::can ...
+	  # return 1 if $it is capable of the method given -- otherwise 0
+	  my($it, $m) = @_[0,1];
+	  return undef unless ref $it;
+
+	  croak "undef is not a valid method name"       unless defined($m);
+	  croak "null-string is not a valid method name" unless length($m);
+
+	  foreach my $o (&Class::Classless::X::ISA_TREE($it)) {
+		 return 1
+		  if  ref($o->{'METHODS'} || 0)   # sanity
+			&& exists $o->{'METHODS'}{$m};
+	  }
+
+	  return 0;
+	}
+
+
+	###########################################################################
+
+	sub Class::Classless::X::isa { # Like UNIVERSAL::isa
+	  # Returns true for $X->isa($Y) iff $Y is $X or is an ancestor of $X.
+
+	  return unless ref($_[0]) && ref($_[1]);
+	  return scalar(grep {$_ eq $_[1]} &Class::Classless::X::ISA_TREE($_[0])); 
+	}
+
+	###########################################################################
+
+	sub nodelist { join ', ', map { "" . ($_->{'NAME'} || $_) . ""} @_ }
+
+	###########################################################################
+	###########################################################################
+	###########################################################################
+	# Methods for the CALLSTATE class.
+	#  Basically, CALLSTATE objects represent the state of the dispatcher,
+	#   frozen at the moment when the method call was dispatched to the
+	#   appropriate sub.
+	#  In the grand scheme of things, this needn't be a class -- I could
+	#   have just made the callstate data-object be a hash with documented
+	#   keys, or a closure that responded to only certain parameters,
+	#   etc.  But I like it this way.  And I like being able to say simply
+	#   $cs->NEXT
+	#  Yes, these are a bit cryptically written, but it's behoovy for
+	#   them to be very very efficient.
+
+	@Class::Classless::ISA = ();
+	sub Class::Classless::CALLSTATE::found_name { $_[0][0] }
+		#  the method name called and found
+	sub Class::Classless::CALLSTATE::found_depth { $_[0][1] }
+		#  my depth in the lineage
+	sub Class::Classless::CALLSTATE::lineage { @{$_[0][2]} }
+		#  my lineage
+	sub Class::Classless::CALLSTATE::target { $_[0][2][  0          ] }
+		#  the object that's the target -- same as $_[0] for the method called
+	sub Class::Classless::CALLSTATE::home   { $_[0][2][  $_[0][1]   ] }
+		#  the object I was found in
+	sub Class::Classless::CALLSTATE::sub_found {
+	  $_[0][2][  $_[0][1]   ]{'METHODS'}{ $_[0][0] }
+	}  #  the routine called
+
+	sub Class::Classless::CALLSTATE::no_fail          {  $_[0][3]         }
+	sub Class::Classless::CALLSTATE::set_no_fail_true {  $_[0][3] = 1     }
+	sub Class::Classless::CALLSTATE::set_fail_false   {  $_[0][3] = 0     }
+	sub Class::Classless::CALLSTATE::set_fail_undef   {  $_[0][3] = undef }
+
+	sub Class::Classless::CALLSTATE::via_next         {  $_[0][4] }
+
+	sub Class::Classless::CALLSTATE::NEXT {
+	  #croak "NEXT needs at least one argument: \$cs->NEXT('method'...)"
+	  # unless @_ > 1;
+		# no longer true.
+	  my $cs = shift @_;
+	  my $m  = shift @_; # which may be (or come out) undef...
+	  $m = $cs->[0] unless defined $m; #  the method name called and found
+
+	  ($cs->[2][0])->$m(
+		 bless( \$cs, 'Class::Classless::CALLSTATE::SHIMMY' ),
+		 @_
+	  );
+	}
+
+	###########################################################################
+};
+#}}}
+
+###############
+###
+#
+# {{{ *** C h a n g e l o g ***
+#
+# 0.6ca
+# - add screen support (from nicklist.pl)
+# - rename to adv_windowlist.pl (advanced window list) since it isn't just a
+#   window list status bar (wlstat) anymore
+# - names can now have a max length and window names can be used
+# - fixed a bug with block display in screen mode and statusbar mode
+# - added space handling to ir_fe and removed it again
+# - now handling formats on my own
+# - added warning about missing sb_act_none abstract leading to
+# - display*active settings
+# - added warning about the bug in awl_display_(no)key_active settings
+#
+# 0.5d
+# - add setting to also hide the last statusbar if empty (awl_all_disable)
+# - reverted to old utf8 code to also calculate broken utf8 length correctly
+# - simplified dealing with statusbars in wlreset
+# - added a little tweak for the renamed term_type somewhere after Irssi 0.8.9
+# - fixed bug in handling channel #$$
+# - typo on line 200 spotted by f0rked
+# - reset background colour at the beginning of an entry
+# 
+# 0.4d
+# - fixed order of disabling statusbars
+# - several attempts at special chars, without any real success
+#   and much more weird new bugs caused by this
+# - setting to specify sort order
+# - reduced timeout values
+# - added awl_hide_data for Geert Hauwaerts ( geert@irssi.org ) :)
+# - make it so the dynamic sub is actually deleted
+# - fix a bug with removing of the last separator
+# - take into consideration parse_special
+# 
+# 0.3b
+# - automatically kill old statusbars
+# - reset on /reload
+# - position/placement settings
+#
+# 0.2
+# - automated retrieval of key bindings (thanks grep.pl authors)
+# - improved removing of statusbars
+# - got rid of status chop
+#
+# 0.1
+# - rewritten to suit my needs
+# - based on chanact 0.5.5
+# }}}
+# vim: se fdm=marker tw=80 :