# trigger.pl - execute a command or replace text, triggered by an event in irssi
# Do /TRIGGER HELP or look at http://wouter.coekaerts.be/irssi/ for help

# Copyright (C) 2002-2010  Wouter Coekaerts <wouter@coekaerts.be>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

use strict;
use Irssi 20020324 qw(command_bind command_runsub command signal_add_first signal_continue signal_stop signal_remove);
use Text::ParseWords;
use IO::File;
use vars qw($VERSION %IRSSI);

$VERSION = '1.2.3';
%IRSSI = (
	authors     => 'Wouter Coekaerts',
	contact     => 'wouter@coekaerts.be',
	name        => 'trigger',
	description => 'execute a command or replace text, triggered by an event in irssi',
	license     => 'GPLv2 or later',
	url         => 'http://wouter.coekaerts.be/irssi/',
	changed     => '2020-01-10',
);

sub cmd_help {
	Irssi::print (<<'SCRIPTHELP_EOF', MSGLEVEL_CLIENTCRAP);

TRIGGER LIST
TRIGGER SAVE
TRIGGER RELOAD
TRIGGER MOVE <number> <number>
TRIGGER DELETE <number>
TRIGGER CHANGE <number> ...
TRIGGER ADD ...

%U%_When to match%_%U 
%UOn which types of event to trigger%U 
     These are simply specified by -name_of_the_type
     The normal IRC event types are:
          publics, %|privmsgs, (pub|priv)actions, (pub|priv)notices, (pub|priv)ctcps, (pub|priv)ctcpreplies, joins, parts, quits, kicks, topics, invites, nick_changes, dcc_msgs, dcc_actions, dcc_ctcps
          mode_channel: %|a mode on the (whole) channel (like +t, +i, +b)
          mode_nick: %|a mode on someone in the channel (like +o, +v)
     -all is an alias for all of those.
     Additionally, there is:
          rawin: %|raw text incoming from the server
          send_command: %|commands you give to irssi
          send_text: %|lines you type that aren't commands
          beep: %|when irssi beeps
          notify_join: %|someone in you notify list comes online
          notify_part: %|someone in your notify list goes offline
          notify_away: %|someone in your notify list goes away
          notify_unaway: %|someone in your notify list goes unaway
          notify_unidle: %|someone in your notify list stops idling
          (pub|priv)flood: %|flood in a channel or in private detected. See /set flood. Be careful, these flood signals can trigger many times for one flood (unless you have autoignore enabled)

%UFilters (conditions) the event has to satisfy%U 
They all take one parameter. If you can give a list, seperate elements by space and use quotes around the list.
All filters except for -pattern and -regexp can also be inversed by prefixing with -not_.
     -pattern: %|The message must match the given pattern. ? and * can be used as wildcards
     -regexp: %|The message must match the given regexp. (see man perlre)
       %|if -nocase is given as an option, the regexp or pattern is matched case insensitive
     -tags: %|The servertag must be in the given list of tags
     -channels: %|The event must be in one of the given list of channels.
                Examples: %|-channels '#chan1 #chan2' or -channels 'IRCNet/#channel'
                          %|-channels 'EFNet/' means every channel on EFNet and is the same as -tags 'EFNet'
     -masks: %|The person who triggers it must match one of the given list of masks
     -hasmode: %|The person who triggers it must have the give mode
               Examples: %|'-o' means not opped, '+ov' means opped OR voiced, '-o&-v' means not opped AND not voiced
     -hasflag: %|Only trigger if friends.pl (friends_shasta.pl) or people.pl is loaded and the person who triggers it has the given flag in the script (same syntax as -hasmode)
     -other_masks
     -other_hasmode
     -other_hasflag: %|Same as above but for the victim for kicks or mode_nick.

%U%_What to do when it matches%_%U 
     -command: Execute the given Irssi-command
                %|You are able to use $1, $2 and so on generated by your regexp pattern.
                %|For multiple commands ; can be used as seperator
                %|The following variables are also expanded:
                   $T: %|Server tag
                   $C: %|Channel name
                   $N: %|Nickname of the person who triggered this command
                   $A: %|His address (foo@bar.com),
                   $I: %|His ident (foo)
                   $H: %|His hostname (bar.com)
                   $M: %|The complete message
                   ${other}: %|The victim for kicks or mode_nick
                   ${mode_type}: %|The type ('+' or '-') for a mode_channel or mode_nick
                   ${mode_char}: %|The mode char ('o' for ops, 'b' for ban,...)
                   ${mode_arg} : %|The argument to the mode (if there is one)
                %|$\X, with X being one of the above expands (e.g. $\M), escapes all non-alphanumeric characters, so it can be used with /eval or /exec. Don't use /eval or /exec without this, it's not safe.
     -replace: %|replaces the matching part with the given replacement in the event (requires a -regexp or -pattern)
     -once: %|remove the trigger if it is triggered, so it only executes once and then is forgotten.
     -stop: %|stops the signal. It won't get displayed by Irssi. Like /IGNORE
     -debug: %|print some debugging info
     -last: %|Don't process any more triggers for this message

%U%_Other options%_%U 
     -disabled: %|Same as removing it, but keeps it in case you might need it later
     -name: %|Give the trigger a name. You can refer to the trigger with this name in add/del/change commands

%U%_Examples%_%U 
 Knockout people who do a !list:
   %#/TRIGGER ADD %|-publics -channels "#channel1 #channel2" -nocase -regexp ^!list -command "KN $N This is not a warez channel!"
 React to !echo commands from people who are +o in your friends-script:
   %#/TRIGGER ADD %|-publics -regexp '^!echo (.*)' -hasflag '+o' -command 'say echo: $1'
 Ignore all non-ops on #channel:
   %#/TRIGGER ADD %|-publics -actions -channels "#channel" -hasmode '-o' -stop
 Send a mail to yourself every time a topic is changed:
   %#/TRIGGER ADD %|-topics -command 'exec echo $\N changed topic of $\C to: $\M | mail you@somewhere.com -s topic'


%U%_Examples with -replace%_%U 
 %|Replace every occurence of shit with sh*t, case insensitive:
   %#/TRIGGER ADD %|-all -nocase -regexp shit -replace sh*t
 %|Strip all colorcodes from *!lamer@*:
   %#/TRIGGER ADD %|-all -masks *!lamer@* -regexp '\x03\d?\d?(,\d\d?)?|\x02|\x1f|\x16|\x06' -replace ''
 %|Never let *!bot1@foo.bar or *!bot2@foo.bar hilight you
 %|(this works by cutting your nick in 2 different parts, 'myn' and 'ick' here)
 %|you don't need to understand the -replace argument, just trust that it works if the 2 parts separately don't hilight:
   %#/TRIGGER ADD %|-all masks '*!bot1@foo.bar *!bot2@foo.bar' -regexp '(myn)(ick)' -nocase -replace '$1\x02\x02$2'
 %|Avoid being hilighted by !top10 in eggdrops with stats.mod (but show your nick in bold):
   %#/TRIGGER ADD %|-publics -regexp '(Top.0\(.*\): 1.*)(my)(nick)' -replace '$1\x02$2\x02\x02$3\x02'
 %|Convert a Windows-1252 Euro to an ISO-8859-15 Euro (same effect as euro.pl):
   %#/TRIGGER ADD %|-regexp '\x80' -replace '\xA4'
 %|Show tabs as spaces, not the inverted I (same effect as tab_stop.pl):
   %#/TRIGGER ADD %|-all -regexp '\t' -replace '    '
SCRIPTHELP_EOF
} # /

my @triggers; # array of all triggers
my %triggers_by_type; # hash mapping types on triggers of that type
my $recursion_depth = 0;
my $changed_since_last_save = 0;

###############
### formats ###
###############

Irssi::theme_register([
	'trigger_header' => 'Triggers:',
	'trigger_line' => '%#$[-4]0 $1',
	'trigger_added' => 'Trigger $0 added: $1',
	'trigger_not_found' => 'Trigger {hilight $0} not found',
	'trigger_saved' => 'Triggers saved to $0',
	'trigger_loaded' => 'Triggers loaded from $0'
]);

#########################################
### catch the signals & do your thing ###
#########################################

# trigger types with a message and a channel
my @allchanmsg_types = qw(publics pubactions pubnotices pubctcps pubctcpreplies parts kicks topics);
# trigger types with a message
my @allmsg_types = (@allchanmsg_types, qw(privmsgs privactions privnotices privctcps privctcpreplies dcc_msgs dcc_actions dcc_ctcps quits));
# trigger types with a channel
my @allchan_types = (@allchanmsg_types, qw(mode_channel mode_nick joins invites pubflood send_text));
# trigger types in -all
my @all_types = (@allmsg_types, qw(mode_channel mode_nick joins invites nick_changes));
# trigger types that can use -masks
my @mask_types = (@all_types, qw(notify_join notify_part notify_away notify_unaway notify_unidle));
# trigger types with a server
my @all_server_types = (@mask_types, qw(rawin pubflood privflood));
# all trigger types
my @trigger_types = (@all_server_types, qw(send_command send_text beep));
#trigger types that are not in -all
#my @notall_types = grep {my $a=$_; return (!grep {$_ eq $a} @all_types);} @trigger_types;
my @notall_types = qw(rawin notify_join notify_part notify_away notify_unaway notify_unidle send_command send_text beep pubflood privflood);

my @signals = (
# "message public", SERVER_REC, char *msg, char *nick, char *address, char *target
{
	'types' => ['publics'],
	'signal' => 'message public',
	'sub' => sub {check_signal_message(\@_,1,$_[0],$_[4],$_[2],$_[3],'publics');},
},
# "message private", SERVER_REC, char *msg, char *nick, char *address
{
	'types' => ['privmsgs'],
	'signal' => 'message private',
	'sub' => sub {check_signal_message(\@_,1,$_[0],undef,$_[2],$_[3],'privmsgs');},
},
# "message irc action", SERVER_REC, char *msg, char *nick, char *address, char *target
{
	'types' => ['privactions','pubactions'],
	'signal' => 'message irc action',
	'sub' => sub {
		if ($_[4] eq $_[0]->{nick}) {
			check_signal_message(\@_,1,$_[0],undef,$_[2],$_[3],'privactions');
		} else {
			check_signal_message(\@_,1,$_[0],$_[4],$_[2],$_[3],'pubactions');
		}
	},
},
# "message irc notice", SERVER_REC, char *msg, char *nick, char *address, char *target
{
	'types' => ['privnotices','pubnotices'],
	'signal' => 'message irc notice',
	'sub' => sub {
		if ($_[4] eq $_[0]->{nick}) {
			check_signal_message(\@_,1,$_[0],undef,$_[2],$_[3],'privnotices');
		} else {
			check_signal_message(\@_,1,$_[0],$_[4],$_[2],$_[3],'pubnotices');
		}
	}
},
# "message join", SERVER_REC, char *channel, char *nick, char *address
{
	'types' => ['joins'],
	'signal' => 'message join',
	'sub' => sub {check_signal_message(\@_,-1,$_[0],$_[1],$_[2],$_[3],'joins');}
},
# "message part", SERVER_REC, char *channel, char *nick, char *address, char *reason
{
	'types' => ['parts'],
	'signal' => 'message part',
	'sub' => sub {check_signal_message(\@_,4,$_[0],$_[1],$_[2],$_[3],'parts');}
},
# "message quit", SERVER_REC, char *nick, char *address, char *reason
{
	'types' => ['quits'],
	'signal' => 'message quit',
	'sub' => sub {check_signal_message(\@_,3,$_[0],undef,$_[1],$_[2],'quits');}
},
# "message kick", SERVER_REC, char *channel, char *nick, char *kicker, char *address, char *reason
{
	'types' => ['kicks'],
	'signal' => 'message kick',
	'sub' => sub {check_signal_message(\@_,5,$_[0],$_[1],$_[3],$_[4],'kicks',{'other'=>$_[2]});}
},
# "message topic", SERVER_REC, char *channel, char *topic, char *nick, char *address
{
	'types' => ['topics'],
	'signal' => 'message topic',
	'sub' => sub {check_signal_message(\@_,2,$_[0],$_[1],$_[3],$_[4],'topics');}
},
# "message invite", SERVER_REC, char *channel, char *nick, char *address
{
	'types' => ['invites'],
	'signal' => 'message invite',
	'sub' => sub {check_signal_message(\@_,-1,$_[0],$_[1],$_[2],$_[3],'invites');}
},
# "message nick", SERVER_REC, char *newnick, char *oldnick, char *address
{
	'types' => ['nick_changes'],
	'signal' => 'message nick',
	'sub' => sub {check_signal_message(\@_,-1,$_[0],undef,$_[1],$_[3],'nick_changes',{'other'=>$_[2]});}
},
# "message dcc", DCC_REC *dcc, char *msg
{
	'types' => ['dcc_msgs'],
	'signal' => 'message dcc',
	'sub' => sub {check_signal_message(\@_,1,$_[0]->{'server'},undef,$_[0]->{'nick'},undef,'dcc_msgs');
	}
},
# "message dcc action", DCC_REC *dcc, char *msg
{
	'types' => ['dcc_actions'],
	'signal' => 'message dcc action',
	'sub' => sub {check_signal_message(\@_,1,$_[0]->{'server'},undef,$_[0]->{'nick'},undef,'dcc_actions');}
},
# "message dcc ctcp", DCC_REC *dcc, char *cmd, char *data
{
	'types' => ['dcc_ctcps'],
	'signal' => 'message dcc ctcp',
	'sub' => sub {check_signal_message(\@_,1,$_[0]->{'server'},undef,$_[0]->{'nick'},undef,'dcc_ctcps');}
},
# "server incoming", SERVER_REC, char *data
{
	'types' => ['rawin'],
	'signal' => 'server incoming',
	'sub' => sub {check_signal_message(\@_,1,$_[0],undef,undef,undef,'rawin');}
},
# "send command", char *args, SERVER_REC, WI_ITEM_REC
{
	'types' => ['send_command'],
	'signal' => 'send command',
	'sub' => sub {
		sig_send_text_or_command(\@_,1);
	}
},
# "send text", char *line, SERVER_REC, WI_ITEM_REC
{
	'types' => ['send_text'],
	'signal' => 'send text',
	'sub' => sub {
		sig_send_text_or_command(\@_,0);
	}
},
# "beep"
{
	'types' => ['beep'],
	'signal' => 'beep',
	'sub' => sub {check_signal_message(\@_,-1,undef,undef,undef,undef,'beep');}
},
# "event "<cmd>, SERVER_REC, char *args, char *sender_nick, char *sender_address
{
	'types' => ['mode_channel', 'mode_nick'],
	'signal' => 'event mode',
	'sub' => sub {
		my ($server, $event_args, $nickname, $address) = @_;
		my ($target, $modes, $modeargs) = split(/ /, $event_args, 3);
		return if (!$server->ischannel($target));
		my (@modeargs) = split(/ /,$modeargs);
		my ($pos, $type, $event_type, $arg) = (0, '+');
		foreach my $char (split(//,$modes)) {
			if ($char eq "+" || $char eq "-") {
				$type = $char;
			} else {
				if ($char =~ /[Oovh]/) { # mode_nick
					$event_type = 'mode_nick';
					$arg = $modeargs[$pos++];
				} elsif ($char =~ /[beIqdk]/ || ( $char =~ /[lfJ]/ && $type eq '+')) { # chan_mode with arg
					$event_type = 'mode_channel';
					$arg = $modeargs[$pos++];
				} else { # chan_mode without arg
					$event_type = 'mode_channel';
					$arg = undef;
				}
				check_signal_message(\@_,-1,$server,$target,$nickname,$address,$event_type,{
					'mode_type' => $type,
					'mode_char' => $char,
					'mode_arg' => $arg,
					'other' => ($event_type eq 'mode_nick') ? $arg : undef
				});
			}
		}
	}
},
# "notifylist joined", SERVER_REC, char *nick, char *user, char *host, char *realname, char *awaymsg
{
	'types' => ['notify_join'],
	'signal' => 'notifylist joined',
	'sub' => sub {check_signal_message(\@_, 5, $_[0], undef, $_[1], $_[2].'@'.$_[3], 'notify_join', {'realname' => $_[4]});}
},
{
	'types' => ['notify_part'],
	'signal' => 'notifylist left',
	'sub' => sub {check_signal_message(\@_, 5, $_[0], undef, $_[1], $_[2].'@'.$_[3], 'notify_left', {'realname' => $_[4]});}
},
{
	'types' => ['notify_unidle'],
	'signal' => 'notifylist unidle',
	'sub' => sub {check_signal_message(\@_, 5, $_[0], undef, $_[1], $_[2].'@'.$_[3], 'notify_unidle', {'realname' => $_[4]});}
},
{
	'types' => ['notify_away', 'notify_unaway'],
	'signal' => 'notifylist away changed',
	'sub' => sub {check_signal_message(\@_, 5, $_[0], undef, $_[1], $_[2].'@'.$_[3], ($_[5] ? 'notify_away' : 'notify_unaway'), {'realname' => $_[4]});}
},
# "ctcp msg", SERVER_REC, char *args, char *nick, char *addr, char *target
{
	'types' => ['pubctcps', 'privctcps'],
	'signal' => 'ctcp msg',
	'sub' => sub {
		my ($server, $args, $nick, $addr, $target) = @_;
		if ($target eq $server->{'nick'}) {
			check_signal_message(\@_, 1, $server, undef, $nick, $addr, 'privctcps');
		} else {
			check_signal_message(\@_, 1, $server, $target, $nick, $addr, 'pubctcps');
		}
	}
},
# "ctcp reply", SERVER_REC, char *args, char *nick, char *addr, char *target
{
	'types' => ['pubctcpreplies', 'privctcpreplies'],
	'signal' => 'ctcp reply',
	'sub' => sub {
		my ($server, $args, $nick, $addr, $target) = @_;
		if ($target eq $server->{'nick'}) {
			check_signal_message(\@_, 1, $server, undef, $nick, $addr, 'privctcpreplies');
		} else {
			check_signal_message(\@_, 1, $server, $target, $nick, $addr, 'pubctcpreplies');
		}
	}
},
# "flood", SERVER_REC, char *nick, char *host, int level, char *target
{
	'types' => ['pubflood', 'privflood'],
	'signal' => 'flood',
	'sub' => sub {
		my ($server, $nick, $host, $level, $target) = @_;
		if ($target eq $server->{'nick'}) {
			check_signal_message(\@_, -1, $server, undef, $nick, $host, 'privflood');
		} else {
			check_signal_message(\@_, -1, $server, $target, $nick, $host, 'pubflood');
		}
	}
}
);

sub sig_send_text_or_command {
	my ($signal, $iscommand) = @_;
	my ($line, $server, $item) = @$signal;
	my ($channelname,$nickname,$address) = (undef,undef,undef);
	if ($item && (ref($item) eq 'Irssi::Irc::Channel' || ref($item) eq 'Irssi::Silc::Channel')) {
		$channelname = $item->{'name'};
	} elsif ($item && ref($item) eq 'Irssi::Irc::Query') { # TODO Silc query ?
		$nickname = $item->{'name'};
		$address = $item->{'address'}
	}
	# TODO pass context also for non-channels (queries and other stuff)
	check_signal_message($signal,0,$server,$channelname,$nickname,$address,$iscommand ? 'send_command' : 'send_text');

}

my %filters = (
'tags' => {
	'types' => \@all_server_types,
	'sub' => sub {
		my ($param, $signal,$parammessage,$server,$channelname,$nickname,$address,$condition,$extra) = @_;
		
		if (!defined($server)) {
			return 0;
		}
		my $matches = 0;
		foreach my $tag (split(/ /,$param)) {
			if (lc($server->{'tag'}) eq lc($tag)) {
				$matches = 1;
				last;
			}
		}
		return $matches;
	}
},
'channels' => {
	'types' => \@allchan_types,
	'sub' => sub {
		my ($param, $signal,$parammessage,$server,$channelname,$nickname,$address,$condition,$extra) = @_;
		
		if (!defined($channelname) || !defined($server)) {
			return 0;
		}
		my $matches = 0;
		foreach my $trigger_channel (split(/ /,$param)) {
			if (lc($channelname) eq lc($trigger_channel)
				|| lc($server->{'tag'}.'/'.$channelname) eq lc($trigger_channel)
				|| lc($server->{'tag'}.'/') eq lc($trigger_channel)) {
				$matches = 1;
				last; # this channel matches, stop checking channels
			}
		}
		return $matches;
	}
},
'masks' => {
	'types' => \@mask_types,
	'sub' => sub {
		my ($param, $signal,$parammessage,$server,$channelname,$nickname,$address,$condition,$extra) = @_;
		$address //= '';
		return  (defined($nickname) && defined($server) && $server->masks_match($param, $nickname, $address));
	}
},
'other_masks' => {
	'types' => ['kicks', 'mode_nick', 'nick_changes'],
	'sub' => sub {
		my ($param, $signal,$parammessage,$server,$channelname,$nickname,$address,$condition,$extra) = @_;
		return 0 unless defined($extra->{'other'});
		my $other_address = ($condition ne 'nick_changes') ? get_address($extra->{'other'}, $server, $channelname) : $address;
		return defined($other_address) && $server->masks_match($param, $extra->{'other'}, $other_address);
	}
},
'hasmode' => {
	'types' => \@all_types,
	'sub' => sub {
		my ($param, $signal,$parammessage,$server,$channelname,$nickname,$address,$condition,$extra) = @_;
		return hasmode($param, $nickname, $server, $channelname);
	}
},
'other_hasmode' => {
	'types' => ['kicks', 'mode_nick'],
	'sub' => sub {
		my ($param,$signal,$parammessage,$server,$channelname,$nickname,$address,$condition,$extra) = @_;
		return defined($extra->{'other'}) && hasmode($param, $extra->{'other'}, $server, $channelname);
	}
},
'hasflag' => {
	'types' => \@all_types,
	'sub' => sub {
		my ($param, $signal,$parammessage,$server,$channelname,$nickname,$address,$condition,$extra) = @_;
		return 0 unless defined($nickname) && defined($address) && defined($server);
		my $flags = get_flags ($server->{'chatnet'},$channelname,$nickname,$address);
		return defined($flags) && check_modes($flags,$param);
	}
},
'other_hasflag' => {
	'types' => ['kicks', 'mode_nick'],
	'sub' => sub {
		my ($param, $signal,$parammessage,$server,$channelname,$nickname,$address,$condition,$extra) = @_;
		return 0 unless defined($extra->{'other'});
		my $other_address = get_address($extra->{'other'}, $server, $channelname);
		return 0 unless defined($other_address);
		my $flags = get_flags ($server->{'chatnet'},$channelname,$extra->{'other'},$other_address);
		return defined($flags) && check_modes($flags,$param);
	}
},
'mode_type' => {
	'types' => ['mode_channel', 'mode_nick'],
	'sub' => sub {
		my ($param, $signal,$parammessage,$server,$channelname,$nickname,$address,$condition,$extra) = @_;
		return (($param) eq $extra->{'mode_type'});
	}
},
'mode_char' => {
	'types' => ['mode_channel', 'mode_nick'],
	'sub' => sub {
		my ($param, $signal,$parammessage,$server,$channelname,$nickname,$address,$condition,$extra) = @_;
		return (($param) eq $extra->{'mode_char'});
	}
},
'mode_arg' => {
	'types' => ['mode_channel', 'mode_nick'],
	'sub' => sub {
		my ($param, $signal,$parammessage,$server,$channelname,$nickname,$address,$condition,$extra) = @_;
		return (($param) eq $extra->{'mode_arg'});
	}
}
);

sub get_address {
	my ($nick, $server, $channel) = @_;
	my $nickrec = get_nickrec($nick, $server, $channel);
	return $nickrec ? $nickrec->{'host'} : undef;
}
sub get_nickrec {
	my ($nick, $server, $channel) = @_;
	return unless defined($server) && defined($channel) && defined($nick);
	my $chanrec = $server->channel_find($channel);
	return $chanrec ? $chanrec->nick_find($nick) : undef;
}

sub hasmode {
	my ($param, $nickname, $server, $channelname) = @_;
	my $nickrec = get_nickrec($nickname, $server, $channelname);
	return 0 unless defined $nickrec;
	my $modes =
		($nickrec->{'op'} ? 'o' : '')
		. ($nickrec->{'voice'} ? 'v' : '')
		. ($nickrec->{'halfop'} ? 'h' : '')
	;
	return check_modes($modes, $param);
}

# list of all switches
my @trigger_switches = (@trigger_types, qw(all nocase stop once debug disabled last));
# parameters (with an argument)
my @trigger_params = qw(pattern regexp command replace name);
# all options that can be used to set filters, including negative matches (not_<filter>)
my @trigger_filter_options = map(($_,'not_'.$_), keys(%filters));
# list of all options (including switches) for /TRIGGER ADD
my @trigger_add_options = (@trigger_switches, @trigger_params, @trigger_filter_options);
# same for /TRIGGER CHANGE, this includes the -no<option>'s
my @trigger_options = map(($_,'no'.$_) ,@trigger_add_options);

# check the triggers on $signal's $parammessage parameter, for triggers with $condition set
#  on $server in $channelname, for $nickname!$address
# set $parammessage to -1 if the signal doesn't have a message
# for signal without channel, nick or address, set to undef
sub check_signal_message {
	my ($signal, $parammessage, $server, $channelname, $nickname, $address, $condition, $extra) = @_;
	my ($changed, $stopped, $context, $need_rebuild);
	my $message = ($parammessage == -1) ? '' : $signal->[$parammessage];

	return if (!$triggers_by_type{$condition});
	
	if ($recursion_depth > 10) {
		Irssi::print("Trigger error: Maximum recursion depth reached, aborting trigger.", MSGLEVEL_CLIENTERROR);
		return;
	}
	$recursion_depth++;

TRIGGER:	
	foreach my $trigger (@{$triggers_by_type{$condition}}) {
		# check filters
		foreach my $trigfilter (filters_for_trigger($trigger)) {
			my $filter_sub = $trigfilter->{'filter'}->{'sub'};
			my $filter_matches = !!(&$filter_sub($trigfilter->{'param'}, $signal, $parammessage, $server, $channelname, $nickname, $address, $condition, $extra));
			if ($filter_matches != $trigfilter->{'must_match'}) { # if it didn't match, or if it's a -not_* filter and it did match
				next TRIGGER;
			}
		}
		
		# check regexp (and keep matches in @- and @+, so don't make a this a {block})
		next if ($trigger->{'compregexp'} && ($parammessage == -1 || $message !~ m/$trigger->{'compregexp'}/));
		
		# if we got this far, it fully matched, and we need to do the replace/command/stop/once
		my $expands = $extra;
		$expands->{'M'} = $message,;
		$expands->{'T'} = (defined($server)) ? $server->{'tag'} : '';
		$expands->{'C'} = $channelname;
		$expands->{'N'} = $nickname;
		$expands->{'A'} = $address;
		$expands->{'I'} = ((!defined($address)) ? '' : substr($address,0,index($address,'@')));
		$expands->{'H'} = ((!defined($address)) ? '' : substr($address,index($address,'@')+1));
		$expands->{'$'} = '$';
		$expands->{';'} = ';';

		if (defined($trigger->{'replace'})) { # it's a -replace
			$message =~ s/$trigger->{'compregexp'}/do_expands(0,$trigger->{'compreplace'},$expands,$message)/ge;
			$changed = 1;
		}
		
		if ($trigger->{'command'}) { # it's a (nonempty) -command
			my $command = $trigger->{'command'};
			# $1 = the stuff behind the $ we want to expand: a number, or a character from %expands
			$command = do_expands(1, $command, $expands, $message);
			
			if (defined($server)) {
				if (defined($channelname) && $server->channel_find($channelname)) {
					$context = $server->channel_find($channelname);
				} else {
					$context = $server;
				}
			} else {
				$context = undef;
			}
			
			if (defined($context)) {
				$context->command("eval $command");
			} else {
				Irssi::command("eval $command");
			}
		}

		if ($trigger->{'debug'}) {
			print("DEBUG: trigger $condition pmesg=$parammessage message=$message server=$server->{tag} channel=$channelname nick=$nickname address=$address " . join(' ',map {$_ . '=' . $extra->{$_}} keys(%$extra)));
		}
		
		if ($trigger->{'stop'}) {
			$stopped = 1;
		}
		
		if ($trigger->{'once'}) {
			# find this trigger in the real trigger list, and remove it
			for (my $realindex=0; $realindex < scalar(@triggers); $realindex++) {
				if ($triggers[$realindex] == $trigger) {
					splice (@triggers,$realindex,1);
					last;
				}
			}
			$need_rebuild = 1;
		}
		if ($trigger->{'last'}) {
			last TRIGGER;
		}
	}

	if ($need_rebuild) {
		rebuild();
		$changed_since_last_save = 1;
	}
	if ($stopped) { # stopped with -stop
		signal_stop();
	} elsif ($changed) { # changed with -replace
		$signal->[$parammessage] = $message;
		signal_continue(@$signal);
	}
	$recursion_depth--;
}

# return array of filters for the given trigger
sub filters_for_trigger($) {
	my ($trigger) = @_;
	return values(%{$trigger->{'filters'}});
}

# used in check_signal_message to expand $'s
# $inthis is a string that can contain $ stuff (like 'foo$1bar$N')
sub do_expands {
	my ($escape, $inthis, $expands, $from) = @_;
	# @+ and @- are copied because there are two s/// nested, and the inner needs the $1 and $2,... of the outer one
	my @plus = @+;
	my @min = @-;
	my $p = \@plus; my $m = \@min;
	$inthis =~ s/\$(\\*(\d+|[^0-9x{]|x[0-9a-fA-F][0-9a-fA-F]|{.*?}))/expand_and_escape($escape,$1,$expands,$m,$p,$from)/ge;
	return $inthis;
}

# \ $ and ; may need extra escaping because we use eval for -command
sub expand_and_escape {
	my $escape = shift;
	my $retval = expand(@_);
	if ($escape) {
		$retval =~ s/([\\\$;])/\\\1/g;
	}
	return $retval;
}

# used in do_expands (via expand_and_escape), to_expand is the part after the $
sub expand {
	my ($to_expand, $expands, $min, $plus, $from) = @_;
	if ($to_expand =~ /^\d+$/) { # a number => look up in $vars
		# from man perlvar:
		# $3 is the same as "substr $var, $-[3], $+[3] - $-[3])"
		return ($to_expand > @{$min} ? '' : substr($from,$min->[$to_expand],$plus->[$to_expand]-$min->[$to_expand]));
	} elsif ($to_expand =~ s/^\\//) { # begins with \, so strip that from to_expand
		my $exp = expand($to_expand,$expands,$min,$plus,$from); # first expand without \
		$exp =~ s/([^a-zA-Z0-9])/\\\1/g; # escape non-word chars
		return $exp;
	} elsif ($to_expand =~ /^x([0-9a-fA-F]{2})/) { # $xAA
		return chr(hex($1));
	} elsif ($to_expand =~ /^{(.*?)}$/) { # ${foo}
		return expand($1, $expands, $min, $plus, $from);
	} else { # look up in $expands
		return $expands->{$to_expand};
	}
}

sub check_modes {
	my ($has_modes, $need_modes) = @_;
	my $matches;
	my $switch = 1; # if a '-' if found, will be 0 (meaning the modes should not be set)
	foreach my $need_mode (split /&/, $need_modes) {
		$matches = 0;
		foreach my $char (split //, $need_mode) {
			if ($char eq '-') {
				$switch = 0;
			} elsif ($char eq '+') {
				$switch = 1;
			} elsif ((index($has_modes, $char) != -1) == $switch) {
				$matches = 1;
				last;
			}
		}
		if (!$matches) {
			return 0;
		}
	}
	return 1;
}

# get someones flags from people.pl or friends(_shasta).pl
sub get_flags {
	my ($chatnet, $channel, $nick, $address) = @_;
	my $flags;
	no strict 'refs';
	if (%{ 'Irssi::Script::people::' }) {
		if (defined ($channel)) {
			$flags = (&{ 'Irssi::Script::people::find_local_flags' }($chatnet,$channel,$nick,$address));
		} else {
			$flags = (&{ 'Irssi::Script::people::find_global_flags' }($chatnet,$nick,$address));
		}
		$flags = join('',keys(%{$flags}));
	} else {
		my $shasta;
		if (%{ 'Irssi::Script::friends_shasta::' }) {
			$shasta = 'friends_shasta';
		} elsif (defined &{ 'Irssi::Script::friends::get_idx' }) {
			$shasta = 'friends';
		} else {
			return undef;
		}
		my $idx = (&{ 'Irssi::Script::'.$shasta.'::get_idx' }($nick, $address));
		if ($idx == -1) {
			return '';
		}
		$flags = (&{ 'Irssi::Script::'.$shasta.'::get_friends_flags' }($idx,undef));
		if ($channel) {
			$flags .= (&{ 'Irssi::Script::'.$shasta.'::get_friends_flags' }($idx,$channel));
		}
	}
	return $flags;
}

########################################################
### internal stuff called by manage, needed by above ###
########################################################

my %mask_to_regexp = ();
foreach my $i (0..255) {
    my $ch = chr $i;
    $mask_to_regexp{$ch} = "\Q$ch\E";
}
$mask_to_regexp{'?'} = '(.)';
$mask_to_regexp{'*'} = '(.*)';

sub compile_trigger {
	my ($trigger) = @_;
	my $regexp;
	
	if ($trigger->{'regexp'}) {
		$regexp = $trigger->{'regexp'};
	} elsif ($trigger->{'pattern'}) {
		$regexp = $trigger->{'pattern'};
		$regexp =~ s/(.)/$mask_to_regexp{$1}/g;
	} else {
		delete $trigger->{'compregexp'};
		return;
	}
	
	if ($trigger->{'nocase'}) {
		$regexp = '(?i)' . $regexp;
	}
	
	$trigger->{'compregexp'} = qr/$regexp/;
	
	if(defined($trigger->{'replace'})) {
		(my $replace = $trigger->{'replace'}) =~ s/\$/\$\$/g;
		$trigger->{'compreplace'} = Irssi::parse_special($replace);
	}
}

# rebuilds triggers_by_type and updates signal binds
sub rebuild {
	%triggers_by_type = ();
	foreach my $trigger (@triggers) {
		if (!$trigger->{'disabled'}) {
			if ($trigger->{'all'}) {
				# -all is an alias for all types in @all_types for which the filters can apply
ALLTYPES:
				foreach my $type (@all_types) {
					# check if all filters can apply to $type
					foreach my $trigfilter (filters_for_trigger($trigger)) {
						if (! grep {$_ eq $type} @{$trigfilter->{'filter'}->{'types'}}) {
							next ALLTYPES;
						}
					}
					push @{$triggers_by_type{$type}}, ($trigger);
				}
			}
			
			foreach my $type ($trigger->{'all'} ? @notall_types : @trigger_types) {
				if ($trigger->{$type}) {
					push @{$triggers_by_type{$type}}, ($trigger);
				}
			}
		}
	}
	
	foreach my $signal (@signals) {
		my $should_bind = 0;
		foreach my $type (@{$signal->{'types'}}) {
			if (defined($triggers_by_type{$type})) {
				$should_bind = 1;
			}
		}
		if ($should_bind && !$signal->{'bind'}) {
			signal_add_first($signal->{'signal'}, $signal->{'sub'});
			$signal->{'bind'} = 1;
		} elsif (!$should_bind && $signal->{'bind'}) {
			signal_remove($signal->{'signal'}, $signal->{'sub'});
			$signal->{'bind'} = 0;
		}
	}
}

################################
### manage the triggers-list ###
################################

my $trigger_file; # cached setting

sub sig_setup_changed {
	$trigger_file = Irssi::settings_get_str('trigger_file');
}

sub autosave {
	cmd_save() if ($changed_since_last_save);
}

# TRIGGER SAVE
sub cmd_save {
	my $io = new IO::File $trigger_file, "w";
	if (defined $io) {
		$io->print("#Triggers file version $VERSION\n");
		foreach my $trigger (@triggers) {
			$io->print(to_string($trigger) . "\n");
		}
		$io->close;
	}
	Irssi::printformat(MSGLEVEL_CLIENTNOTICE, 'trigger_saved', $trigger_file);
	$changed_since_last_save = 0;
}

# save on unload
sub UNLOAD {
	cmd_save();
}

# TRIGGER LOAD
sub cmd_load {
	sig_setup_changed(); # make sure we've read the trigger_file setting
	my $converted = 0;
	my $io = new IO::File $trigger_file, "r";
	if (not defined $io) {
		if (-e $trigger_file) {
			Irssi::print("Error opening triggers file", MSGLEVEL_CLIENTERROR);
		}
		return;
	}
	if (defined $io) {
		@triggers = ();
		my $text;
		$text = $io->getline;
		my $file_version = '';
		if ($text =~ /^#Triggers file version (.*)\n/) {
			$file_version = $1;
		}
		if ($file_version lt '0.6.1+2') {
			no strict 'vars';
			$text .= $_ foreach ($io->getlines);
			my $rep = eval "$text";
			if (! ref $rep) {
				Irssi::print("Error in triggers file");
				return;
			}
			my @old_triggers = @$rep;
		
			for (my $index=0;$index < scalar(@old_triggers);$index++) { 
				my $trigger = $old_triggers[$index];
	
				if ($file_version lt '0.6.1') {
					# convert old names: notices => pubnotices, actions => pubactions
					foreach $oldname ('notices','actions') {
						if ($trigger->{$oldname}) {
							delete $trigger->{$oldname};
							$trigger->{'pub'.$oldname} = 1;
							$converted = 1;
						}
					}
				}
				if ($file_version lt '0.6.1+1' && $trigger->{'modifiers'}) {
					if ($trigger->{'modifiers'} =~ /i/) {
						$trigger->{'nocase'} = 1;
						Irssi::print("Trigger: trigger ".($index+1)." had 'i' in it's modifiers, it has been converted to -nocase");
					}
					if ($trigger->{'modifiers'} !~ /^[ig]*$/) {
						Irssi::print("Trigger: trigger ".($index+1)." had unrecognised modifier '". $trigger->{'modifiers'} ."', which couldn't be converted.");
					}
					delete $trigger->{'modifiers'};
					$converted = 1;
				}
				
				# convert to text with compat, and then to new trigger hash
				$text = to_string($trigger,1);
				my @args = &shellwords($text . ' a');
				my $trigger = parse_options({},@args);
				if ($trigger) {
					push @triggers, $trigger;
				}
			}
		} else { # new format
			while ( $text = $io->getline ) {
				chop($text);
				next if ($text =~ /^[ ]*$|^#/);
				my @args = &shellwords($text . ' a');
				my $trigger = parse_options({},@args);
				if ($trigger) {
					push @triggers, $trigger;
				}
			}
		}
	}
	Irssi::printformat(MSGLEVEL_CLIENTNOTICE, 'trigger_loaded', $trigger_file);
	if ($converted) {
		Irssi::print("Trigger: Triggers file will be in new format next time it's saved.");
	}
	rebuild();
}

# escape for printing with to_string
# <<abcdef>>      => << 'abcdef' >>
# <<abc'def>>     => << "abc'def" >>
# <<abc'def\x02>> => << 'abc'\''def\x02' >>
sub param_to_string {
	my ($text) = @_;
	# avoid ugly escaping if we can use "-quotes without other escaping (no " or \)
	if ($text =~ /^[^"\\]*'[^"\\]$/) {
		return ' "' . $text . '" ';
	}
	# "'" signs without a (odd number of) \ in front of them, need be to escaped as '\''
	# this is ugly :(
	$text =~ s/(^|[^\\](\\\\)*)'/$1'\\''/g;
	return " '$text' ";
}

# converts a trigger back to "-switch -options 'foo'" form
# if $compat, $trigger is in the old format (used to convert)
sub to_string {
	my ($trigger, $compat) = @_;
	my $string;
	
	foreach my $switch (@trigger_switches) {
		if ($trigger->{$switch}) {
			$string .= '-'.$switch.' ';
		}
	}
	
	if ($compat) {
		foreach my $filter (keys(%filters)) {
			if ($trigger->{$filter}) {
				$string .= '-' . $filter . param_to_string($trigger->{$filter});
			}
		}
	} else {
		foreach my $trigfilter (filters_for_trigger($trigger)) {
			$string .= '-' . $trigfilter->{'option'} . param_to_string($trigfilter->{'param'});
		}
	}

	foreach my $param (@trigger_params) {
		if ($trigger->{$param} || ($param eq 'replace' && defined($trigger->{'replace'}))) {
			$string .= '-' . $param . param_to_string($trigger->{$param});
		}
	}
	return $string;
}

# find a trigger (for REPLACE and DELETE), returns index of trigger, or -1 if not found
sub find_trigger {
	my ($data) = @_;
	if ($data =~ /^[0-9]*$/ and defined($triggers[$data-1])) {
		return $data-1;
	} else {
		for (my $i=0; $i < scalar(@triggers); $i++) {
			if ($triggers[$i]->{'name'} eq $data) {
				return $i;
			}
		}
	}
	Irssi::printformat(MSGLEVEL_CLIENTCRAP, 'trigger_not_found', $data);
	return -1; # not found
}


# TRIGGER ADD <options>
sub cmd_add {
	my ($data, $server, $item) = @_;
	my @args = shellwords($data . ' a');
	
	my $trigger = parse_options({}, @args);
	if ($trigger) {
		push @triggers, $trigger;
		Irssi::printformat(MSGLEVEL_CLIENTCRAP, 'trigger_added', scalar(@triggers), to_string($trigger));
		rebuild();
		$changed_since_last_save = 1;
	}
}

# TRIGGER CHANGE <nr> <options>
sub cmd_change {
	my ($data, $server, $item) = @_;
	my @args = shellwords($data . ' a');
	my $index = find_trigger(shift @args);
	if ($index != -1) {
		if(parse_options($triggers[$index], @args)) {
			Irssi::print("Trigger " . ($index+1) ." changed to: ". to_string($triggers[$index]));
		}
		rebuild();
		$changed_since_last_save = 1;
	}
}

# parses options for TRIGGER ADD and TRIGGER CHANGE
# if invalid args returns undef, else changes $thetrigger and returns it
sub parse_options {
	my ($thetrigger,@args) = @_;
	my ($trigger, $option);
	
	if (pop(@args) ne 'a') {
		Irssi::print("Syntax error, probably missing a closing quote", MSGLEVEL_CLIENTERROR);
		return undef;
	}
	
	%$trigger = %$thetrigger; # make a copy to prevent changing the given trigger if args doesn't parse
ARGS:	for (my $arg = shift @args; $arg; $arg = shift @args) {
		# expand abbreviated options, put in $option
		$arg =~ s/^-//;
		$option = undef;
		foreach my $ioption (@trigger_options) {
			if (index($ioption, $arg) == 0) { # -$opt starts with $arg
				if ($option) { # another already matched
					Irssi::print("Ambiguous option: $arg", MSGLEVEL_CLIENTERROR);
					return undef;
				}
				$option = $ioption;
				last if ($arg eq $ioption); # exact match is unambiguous
			}
		}
		if (!$option) {
			Irssi::print("Unknown option: $arg", MSGLEVEL_CLIENTERROR);
			return undef;
		}

		# -<param> <value> or -no<param>
		foreach my $param (@trigger_params) {
			if ($option eq $param) {
				$trigger->{$param} = shift @args;
				next ARGS;
			}
			if ($option eq 'no'.$param) {
				$trigger->{$param} = undef;
				next ARGS;
			}
		}

		# -[no]<switch>
		foreach my $switch (@trigger_switches) {
			# -<switch>
			if ($option eq $switch) {
				$trigger->{$switch} = 1;
				next ARGS;
			}
			# -no<switch>
			elsif ($option eq 'no'.$switch) {
				$trigger->{$switch} = undef;
				next ARGS;
			}
		}
		
		# -[not_]<filter> <value>
		if ($option =~ /^(not_)?(.*)$/ && $filters{$2}) {
			$trigger->{'filters'}->{$option} = {
				option => $option,
				must_match => ($1 ne 'not_'), # if false, trigger must only be done if filter sub returns false
				filter_name => $2,
				filter => $filters{$2},
				param => shift @args
			};
			
			next ARGS;
		}
		
		# -no<filter>
		if ($option =~ /^no(.*)$/ && $filters{$1}) {
			delete $trigger->{'filters'}->{$1};
		}
	}
	
	if (defined($trigger->{'replace'}) && ! $trigger->{'regexp'} && !$trigger->{'pattern'}) {
		Irssi::print("Trigger error: Can't have -replace without -regexp", MSGLEVEL_CLIENTERROR);
		return undef;
	}

	if ($trigger->{'pattern'} && $trigger->{'regexp'}) {
		Irssi::print("Trigger error: Can't have -pattern and -regexp in same trigger", MSGLEVEL_CLIENTERROR);
		return undef;
	}
	
	# remove types that are implied by -all
	if ($trigger->{'all'}) {
		foreach my $type (@all_types) {
			delete $trigger->{$type};
		}
	}
	
	# remove types for which the filters don't apply
	foreach my $type (@trigger_types) {
		if ($trigger->{$type}) {
			foreach my $trigfilter (filters_for_trigger($trigger)) {
				if (!grep {$_ eq $type} @{$trigfilter->{'filter'}->{'types'}}) {
					Irssi::print("Warning: the filter -" . $trigfilter->{'option'} . " can't apply to an event of type -$type, so I'm removing that type from this trigger.");
					delete $trigger->{$type};
				}
			}
		}
	}

	# check if it has at least one type
	my $has_a_type;
	foreach my $type (@trigger_types) {
		if ($trigger->{$type}) {
			$has_a_type = 1;
			last;
		}
	}
	if (!$has_a_type && !$trigger->{'all'}) {
		Irssi::print("Warning: this trigger doesn't trigger on any type of message. you probably want to add -publics or -all");
	}
	
	compile_trigger($trigger);
	%$thetrigger = %$trigger; # copy changes to real trigger
	return $thetrigger;
}

# TRIGGER DELETE <num>
sub cmd_del {
	my ($data, $server, $item) = @_;
	my @args = shellwords($data);
	my $index = find_trigger(shift @args);
	if ($index != -1) {
		Irssi::print("Deleted ". ($index+1) .": ". to_string($triggers[$index]));
		splice (@triggers,$index,1);
		rebuild();
		$changed_since_last_save = 1;
	}
}

# TRIGGER MOVE <num> <num>
sub cmd_move {
	my ($data, $server, $item) = @_;
	my @args = &shellwords($data);
	my $index = find_trigger(shift @args);
	if ($index != -1) {
		my $newindex = find_trigger(shift @args);
		if ($newindex != -1) {
			Irssi::print("Moved from " . ($index+1) . " to " . ($newindex+1) . ": " . to_string($triggers[$index]));
			my $trigger = splice (@triggers,$index,1); # remove from old place
			splice (@triggers,$newindex,0,($trigger)); # insert at new place
			rebuild();
			$changed_since_last_save = 1;
		}
	}
}

# TRIGGER LIST
sub cmd_list {
	Irssi::printformat(MSGLEVEL_CLIENTCRAP, 'trigger_header');
	my $i=1;
	foreach my $trigger (@triggers) {
		Irssi::printformat(MSGLEVEL_CLIENTCRAP, 'trigger_line', $i++, to_string($trigger));
	}
}

######################
### initialisation ###
######################

command_bind('trigger help',\&cmd_help);
command_bind('help trigger',\&cmd_help);
command_bind('trigger add',\&cmd_add);
command_bind('trigger change',\&cmd_change);
command_bind('trigger move',\&cmd_move);
command_bind('trigger list',\&cmd_list);
command_bind('trigger delete',\&cmd_del);
command_bind('trigger save',\&cmd_save);
command_bind('trigger reload',\&cmd_load);
command_bind 'trigger' => sub {
    my ( $data, $server, $item ) = @_;
    $data =~ s/\s+$//g;
    command_runsub('trigger', $data, $server, $item);
};

Irssi::signal_add('setup saved', \&autosave);
Irssi::signal_add('setup changed', \&sig_setup_changed);

# This makes tab completion work
Irssi::command_set_options('trigger add',join(' ',@trigger_add_options));
Irssi::command_set_options('trigger change',join(' ',@trigger_options));

Irssi::settings_add_str($IRSSI{'name'}, 'trigger_file', Irssi::get_irssi_dir()."/triggers");

cmd_load();
