#!/usr/bin/perl -w
# various kick and ban commands
#  by c0ffee 
#    - http://www.penguin-breeder.org/irssi/

#<scriptinfo>
use strict;
use vars qw($VERSION %IRSSI);

use Irssi 20020120;
$VERSION = "0.27";
%IRSSI = (
    authors => "c0ffee",
    contact => "c0ffee\@penguin-breeder.org",
    name    => "Various kick and ban commands",
    description => "Enhances /k /kb and /kn with some nice options.",
    license => "Public Domain",
    url     => "http://www.penguin-breeder.org/irssi/",
    changed => "2017-03-31",
);
#</scriptinfo>

my %kickreasons  = (
    default => ["random kick victim",
            "no",
            "are you stupid?",
            "i don't like you, go away!",
            "oh, fsck off",
            "waste other ppls time, elsewhere",
            "get out and STAY OUT",
            "don't come back",
            "no thanks",
            "on popular demand, you are now leaving the channel",
            "\$N",
            "*void*",
            "/part is the command you're looking for",
            "this is the irssi of borg. your mIRC will be assimilated. resistance is futile.",
            "Autokick! mwahahahah!"
           ],
    none    => [""],
    topic   => ["\$topic"],
);


# fine tune the script for different chatnets
#    cmdline_k      regular expr that matches a correct cmdline for /k
#    req_chan       0/1 whether the channel is always part of the cmdline
#    num_nicks      number of nicks ... (-1 = inf)
#    start_with_dash    0/1 whether the normal cmdline may start with a dash
#    match_chn      matches channels
#    match_n        match nicks
#    match_reason   matches reasons
#    default_reason reason to give as "no reason"
my %cfg = (
    IRC => {
            cmdline_k       => '\s*([!#+&][^\x0\a\n\r ]*)\s+[-\[\]\\\\\`{}\w_|^\'~]+(,[-\[\]\\\\\`{}\w_|^\'~]+)*\s+\S.*',
            req_chan        => 0,
            num_nicks       => 3, # actually, /k takes more, but
                                  # normal irc servers only take
                          # three in a row
            start_with_dash => 1,
            match_chn       => '([!#+&][^\x0\a\n\r ]*)\s',
            match_n         => '(?:^|\s+)([-\[\]\\\\\`{}\w_|^\'~]+(?:,[-\[\]\\\\\`{}\w_|^\']+)*)',
            match_reason    => '^\s*[!#+&][^\x0\a\n\r ]*\s+[-\[\]\\\\\`{}\w_|^\'~]+(?:,[-\[\]\\\\\`{}\w_|^\'~]+)*\s+(\S.*)$',
            default_reason  => '$N'
        },

    SILC    => {
            cmdline_k   => '\s*[^\x0-\x20\*\?,@!]+\s+[^\x0-\x20\*\?,@!]+\s+\S.*',
            req_chan    => 1,
            num_nicks   => 1,
            start_with_dash => 0,
            match_chn   => '\s*([^\x0-\x20\*\?,@!]+)\s+[^\x0-\x20\*\?,@!]+(?:,[^\x0-\x20\*\?,@!]+)*',
            match_n     => '\s*(?:[^\x0-\x20\*\?,@!]+\s+)?([^\x0-\x20\*\?,@!]+(?:,[^\x0-\x20\*\?,@!]+)*)',
            match_reason    => '\s*[^\x0-\x20\*\?,@!]+\s+[^\x0-\x20\*\?,@!]+(?:,[^\x0-\x20\*\?,@!]+)*\s+(\S.*)',
            default_reason  => '$N'
        }
);

sub initialize {

    my $conf_file = Irssi::settings_get_str("kicks_configuration");
    $conf_file =~ s/~/$ENV{HOME}/;
    my ($basedir) = $conf_file =~ /^(.*\/).*?/;

    if (-f $conf_file) {
        open CONF, '<', $conf_file;

        my $line=0;
        
        while (<CONF>) {
            $line++;

            next if /^\s*#/;

            chomp;
            my ($key, $reasons) = /^(\S+)\s+(.+)\s*$/ or next;

            if ($reasons =~ /\`([^\s]+).*?\`/) {
                $kickreasons{$key} = "$reasons";
                Irssi::print("Added executable $1 as $key...");
                next;
            }

            $reasons =~ s/^"(.*)"$/$1/;
            $reasons =~ s/~/$ENV{HOME}/;
            $reasons =~ s/^([^\/])/$basedir$1/;
            
            if (-f $reasons) {

                $kickreasons{$key} = [];

                open REASON, '<',  $reasons;

                while (<REASON>) {
                    chomp;
                    push @{$kickreasons{$key}}, $_;
                }

                close REASON;
                Irssi::print("Loaded $reasons as $key...");
            } else {
                Irssi::print("can't parse config line $line...");
            }
        }
        close CONF;
    } else {
        Irssi::print("Could not find configuration file for kicks...");
        Irssi::print("... use /set kicks_configuration <file>");
    }
}

            
sub get_a_reason {
    my ($topic) = @_;


    return "" if not defined $kickreasons{$topic};

    $_ = eval $kickreasons{$topic}, chomp, s/[\n\t]+/ /mg, return $_
        if ref($kickreasons{$topic}) ne "ARRAY";

    return $kickreasons{$topic}[rand @{$kickreasons{$topic}}];
    
}

sub cmd_realkick {
    my ($data, $server, $channel, $cmd) = @_;
    my $reasons = "default";

    return if not $server
              or not defined $cfg{$server->{chat_type}}
          or not $channel
              or $data =~ /^$cfg{$server->{chat_type}}{cmdline_k}$/;

    Irssi::signal_stop();

    # let's see whether some options where supplied
    my $default = Irssi::settings_get_str("default_kick_options");
    $data = "$default $data" if not $default =~ /^\s*$/;
    my @opts = split /\s+/, $data;
    my $opt;
    my $fail=0;

    while (($opt) = (shift @opts) =~ /^\s*-(\S+)/) {
      
        $data =~ s/^\s*--\s+//, last if $opt eq "-";
      
        $data =~ s/^\s*-$opt\s+//, 
            $reasons = lc $opt,
        next if defined $kickreasons{lc $opt};

        last if $cfg{$server->{chat_type}}{start_with_dash};

        Irssi::print("Unknown option -$opt");
        $fail = 1;

    }

    return if $fail;

    my $chn = "";
    ($chn) = $data =~ /^$cfg{$server->{chat_type}}{match_chn}/;

    if ($cfg{$server->{chat_type}}{req_chan} && ($chn eq "")) {
      Irssi::print "Not joined to any channel";
      return;
    }

    # do we need to add a channel?
    if ($chn eq "") {
    Irssi::print("Not joined to any channel"), return 
        if $channel->{type} ne "CHANNEL";
        $chn = $channel->{name};

    $data = "$chn $data";
    }

    # is a reason already supplied?
    my $reason;
    $reason = get_a_reason($reasons)
        if not (($reason) = $data =~ /$cfg{$server->{chat_type}}{match_reason}/);

    $reason = $cfg{$server->{chat_type}}{default_reason}
        if $reason =~ /^\s*$/;
    
    my @nicks = split /,/, ($data =~ /$cfg{$server->{chat_type}}{match_n}/)[0];
    my $num_nicks = $cfg{$server->{chat_type}}{num_nicks};
    $num_nicks = @nicks if $num_nicks <= 0;

    my @commands;
    undef @commands;

    while (@nicks) {
        my $tmp = ($chn ne "" ? "$chn " : "") .
               join ",", (splice @nicks,0,$num_nicks);
        $tmp =~ s/([;\\\$])/\\$1/g;
        push @commands, "$tmp $reason";
    }
    
    foreach (@commands) {
      if ($_ =~ /^$cfg{$server->{chat_type}}{cmdline_k}$/) {
        s/\s+$//;
        $channel->command("EVAL $cmd $_");
      } else {
        Irssi::print("BUG: generated invalid $cmd command: $_");
      }
    }
}

sub cmd_kick {
    my ($data, $server, $channel) = @_;

    cmd_realkick $data, $server, $channel, "KICK";

}

sub cmd_kickban {
    my ($data, $server, $channel) = @_;

    cmd_realkick $data, $server, $channel, "KICKBAN";

}

Irssi::settings_add_str("misc", "default_kick_options", "");
Irssi::settings_add_str("misc", "kicks_configuration",
                Irssi::get_irssi_dir() . "/kicks.conf");

Irssi::command_bind("kick", "cmd_kick");
Irssi::command_bind("kickban", "cmd_kickban");

initialize();