who command. correctly forget people when we are kicked.

[ircbot] / bot.tcl

#!/usr/bin/tclsh8.2

set host chiark
set port 6667
if {![info exists nick]} { set nick Blight }
if {![info exists ownfullname]} { set ownfullname "here to Help" }
set ownmailaddr blight@chiark.greenend.org.uk

if {![info exists globalsecret]} {
    set gsfile [open /dev/urandom r]
    fconfigure $gsfile -translation binary
    set globalsecret [read $gsfile 32]
    binary scan $globalsecret H* globalsecret
    close $gsfile
    unset gsfile
}

proc try_except_finally {try except finally} {
    global errorInfo errorCode
    set er [catch { uplevel 1 $try } emsg]
    if {$er} {
        set ei $errorInfo
        set ec $errorCode
        if {[catch { uplevel 1 $except } emsg3]} {
            append ei "\nALSO ERROR HANDLING ERROR:\n$emsg3"
        }
    }
    set er2 [catch { uplevel 1 $finally } emsg2]
    if {$er} {
        if {$er2} {
            append ei "\nALSO ERROR CLEANING UP:\n$emsg2"
        }
        return -code $er -errorinfo $ei -errorcode $ec $emsg
    } elseif {$er2} {
        return -code $er2 -errorinfo $errorInfo -errorcode $errorCode $emsg2
    } else {
        return $emsg
    }
}

proc sendout {command args} {
    global sock
    if {[llength $args]} {
        set la [lindex $args end]
        set args [lreplace $args end end]
        foreach i $args {
            if {[regexp {[: ]} $i]} {
                error "bad argument in output $i ($command $args)"
            }
        }
        lappend args :$la
    }
    set args [lreplace $args 0 -1 $command]
    set string [join $args { }]
    puts "[clock seconds] -> $string"
    puts $sock $string
}

proc log {data} {
    puts $data
}

proc logerror {data} {
    log $data
}

proc saveeic {} {
    global saveei saveec errorInfo errorCode

    set saveei $errorInfo
    set saveec $errorCode

    puts ">$saveec|$saveei<"
}

proc bgerror {msg} {
    global save
    logerror $msg
    saveeic
}

proc onread {args} {
    global sock nick calling_nick
    
    if {[gets $sock line] == -1} { set terminate 1; return }
    regsub -all "\[^ -\176\240-\376\]" $line ? line
    set org $line
    catch { unset calling_nick }
    if {[regexp -nocase {^:([^ ]+) (.*)} $line dummy prefix remain]} {
        set line $remain
        if {[regexp {^([^!]+)!} $prefix dummy maybenick]} {
            set calling_nick $maybenick
            if {"[irctolower $maybenick]" == "[irctolower $nick]"} return
        }
    } else {
        set prefix {}
    }
    if {![string length $line]} { return }
    if {![regexp -nocase {^([0-9a-z]+) *(.*)} $line dummy command line]} {
        log "bad command: $org"
        return
    }
    set command [string toupper $command]
    set params {}
    while {[regexp {^([^ :]+) *(.*)} $line dummy thisword line]} {
        lappend params $thisword
    }
    if {[regexp {^:(.*)} $line dummy thisword]} {
        lappend params $thisword
    } elseif {[string length $line]} {
        log "junk at end: $org"
        return
    }
    if {"$command" == "PRIVMSG" &&
        [regexp {^[&#+!]} [lindex $params 0]] &&
        ![regexp {^!} [lindex $params 1]]} {
        # on-channel message, ignore
        catch {
            recordlastseen_p $prefix "talking on [lindex $params 0]" 1
        }
        return
    }
    log "[clock seconds] <- $org"
    set procname msg_$command
    if {[catch { info body $procname }]} { return }
    if {[catch {
        eval [list $procname $prefix $command] $params
    } emsg]} {
        logerror "error: $emsg ($prefix $command $params)"
        saveeic
    }
}

proc sendprivmsg {dest l} {
    sendout [expr {[ischan $dest] ? "PRIVMSG" : "NOTICE"}] $dest $l
}
proc sendaction {dest what} { sendout PRIVMSG $dest "\001ACTION $what\001" }
proc msendprivmsg {dest ll} { foreach l $ll { sendprivmsg $dest $l } }
proc msendprivmsg_delayed {delay dest ll} { after $delay [list msendprivmsg $dest $ll] }

proc prefix_none {} {
    upvar 1 p p
    if {[string length $p]} { error "prefix specified" }
}

proc msg_PING {p c s1} {
    prefix_none
    sendout PONG $s1
}

proc check_nick {n} {
    if {[regexp -nocase {[^][\\`_^{|}a-z0-9-]} $n]} { error "bad char in nick" }
    if {[regexp {^[-0-9]} $n]} { error "bad nick start" }
}

proc ischan {dest} {
    return [regexp {^[&#+!]} $dest]
}

proc irctolower {v} {
    foreach {from to} [list "\\\[" "{" \
                          "\\\]" "}" \
                          "\\\\" "|" \
                          "~"    "^"] {
        regsub -all $from $v $to v
    }
    return [string tolower $v]
}

proc prefix_nick {} {
    global nick
    upvar 1 p p
    upvar 1 n n
    if {![regexp {^([^!]+)!} $p dummy n]} { error "not from nick" }
    check_nick $n
    if {"[irctolower $n]" == "[irctolower $nick]"} {
        error "from myself" {} {}
    }
}

proc showintervalsecs {howlong} {
    return [showintervalsecs/[opt timeformat] $howlong]
}

proc showintervalsecs/ks {howlong} {
    if {$howlong < 1000} {
        return "${howlong}s"
    } else {
        if {$howlong < 1000000} {
            set pfx k
            set scale 1000
        } else {
            set pfx M
            set scale 1000000
        }
        set value [expr "$howlong.0 / $scale"]
        foreach {min format} {100 %.0f 10 %.1f 1 %.2f} {
            if {$value < $min} continue
            return [format "$format${pfx}s" $value]
        }
    }
}

proc format_qty {qty unit} {
    set o $qty
    append o " "
    append o $unit
    if {$qty != 1} { append o s }
    return $o
}

proc showintervalsecs/hms {qty} {
    set ul {second 60 minute 60 hour 24 day 7 week}
    set remainv 0
    while {[llength $ul] > 1 && $qty >= [set uv [lindex $ul 1]]} {
        set remainu [lindex $ul 0]
        set remainv [expr {$qty % $uv}]
        set qty [expr {($qty-$remainv)/$uv}]
        set ul [lreplace $ul 0 1]
    }
    set o [format_qty $qty [lindex $ul 0]]
    if {$remainv} {
        append o " "
        append o [format_qty $remainv $remainu]
    }
    return $o
}

proc showinterval {howlong} {
    if {$howlong <= 0} {
        return {just now}
    } else {
        return "[showintervalsecs $howlong] ago"
    }
}

proc showtime {when} {
    return [showinterval [expr {[clock seconds] - $when}]]
}

proc def_msgproc {name argl body} {
    proc msg_$name "varbase $argl" "\
    upvar #0 msg/\$varbase/dest d\n\
    upvar #0 msg/\$varbase/str s\n\
    upvar #0 msg/\$varbase/accum a\n\
$body"
}

def_msgproc begin {dest str} {
    set d $dest
    set s $str
    set a {}
}

def_msgproc append {str} {
    set ns "$s$str"
    if {[string length $s] && [string length $ns] > 65} {
        msg__sendout $varbase
        set s " [string trimleft $str]"
    } else {
        set s $ns
    }
}

def_msgproc finish {} {
    msg__sendout $varbase
    unset s
    unset d
    return $a
}

def_msgproc _sendout {} {
    lappend a [string trimright $s]
    set s {}
}

proc looking_whenwhere {when where} {
    set str [showtime [expr {$when-1}]]
    if {[string length $where]} { append str " on $where" }
    return $str
}

proc recordlastseen_n {n how here} {
    global lastseen lookedfor
    set lastseen([irctolower $n]) [list $n [clock seconds] $how]
    if {!$here} return
    upvar #0 lookedfor([irctolower $n]) lf
    if {[info exists lf]} {
        switch -exact [llength $lf] {
            0 {
                set ml {}
            }
            1 {
                manyset [lindex $lf 0] when who where
                set ml [list \
 "FYI, $who was looking for you [looking_whenwhere $when $where]."]
            }
            default {
                msg_begin tosend $n "FYI, people have been looking for you:"
                set i 0
                set fin ""
                foreach e $lf {
                    incr i
                    if {$i == 1} {
                        msg_append tosend " "
                    } elseif {$i == [llength $lf]} {
                        msg_append tosend " and "
                        set fin .
                    } else {
                        msg_append tosend ", "
                    }
                    manyset $e when who where
                    msg_append tosend \
                            "$who ([looking_whenwhere $when $where])$fin"
                }
                set ml [msg_finish tosend]
            }
        }
        unset lf
        msendprivmsg_delayed 1000 $n $ml
    }
}
                
proc recordlastseen_p {p how here} {
    prefix_nick
    recordlastseen_n $n $how $here
}

proc chanmode_arg {} {
    upvar 2 args cm_args
    set rv [lindex $cm_args 0]
    set cm_args [lreplace cm_args 0 0]
    return $rv
}

proc chanmode_o1 {m g p chan} {
    global nick
    prefix_nick
    set who [chanmode_arg]
    recordlastseen_n $n "being nice to $who" 1
    if {"[irctolower $who]" == "[irctolower $nick]"} {
        sendprivmsg $n Thanks.
    }
}

proc chanmode_o0 {m g p chan} {
    global nick chandeop
    prefix_nick
    set who [chanmode_arg]
    recordlastseen_p $p "being mean to $who" 1
    if {"[irctolower $who]" == "[irctolower $nick]"} {
        set chandeop($chan) [list [clock seconds] $p]
    }
}

proc msg_MODE {p c dest modelist args} {
    if {![ischan $dest]} return
    if {[regexp {^\-(.+)$} $modelist dummy modelist]} {
        set give 0
    } elseif {[regexp {^\+(.+)$} $modelist dummy modelist]} {
        set give 1
    } else {
        error "invalid modelist"
    }
    foreach m [split $modelist] {
        set procname chanmode_$m$give
        if {[catch { info body $procname }]} {
            recordlastseen_p $p "fiddling with $dest" 1
        } else {
            $procname $m $give  $p $dest
        }
    }
}

proc channel_noone_seen {chan} {
    global nick_onchans
    foreach n [array names nick_onchans] {
        upvar #0 nick_onchans($n) oc
        set oc [grep tc {"$tc" != "$chan"} $oc]
    }
}

proc process_kickpart {chan user} {
    global nick
    check_nick $user
    if {![ischan $chan]} { error "not a channel" }
    if {"[irctolower $user]" == "[irctolower $nick]"} {
        channel_noone_seen $chan
    }
    upvar #0 nick_onchans($user) oc
    set lc [irctolower $chan]
    set oc [grep tc {"$tc" != "$lc"} $oc]
    if {![llength $oc]} { nick_forget $user }
    nick_case $user
}    

proc msg_KICK {p c chans users comment} {
    set chans [split $chans ,]
    set users [split $users ,]
    if {[llength $chans] > 1} {
        foreach chan $chans user $users { process_kickpart $chan $user }
    } else {
        foreach user $users { process_kickpart [lindex $chans 0] $user }
    }
}

proc msg_KILL {p c user why} {
    nick_forget $user
}

set nick_arys {onchans username}

proc nick_forget {n} {
    global nick_arys
    foreach ary $nick_arys {
        upvar #0 nick_${ary}($n) av
        catch { unset av }
    }
    nick_case $n
}

proc nick_case {n} {
    global nick_case
    set nick_case([irctolower $n]) $n
}

proc msg_NICK {p c newnick} {
    global nick_arys nick_case
    prefix_nick
    recordlastseen_n $n "changing nicks to $newnick" 0
    recordlastseen_n $newnick "changing nicks from $n" 1
    foreach ary $nick_arys {
        upvar #0 nick_${ary}($n) old
        upvar #0 nick_${ary}($newnick) new
        if {[info exists new]} { error "nick collision ?! $ary $n $newnick" }
        if {[info exists old]} { set new $old; unset old }
    }
    nick_case $newnick
}

proc msg_JOIN {p c chan} {
    prefix_nick
    recordlastseen_n $n "joining $chan" 1
    upvar #0 nick_onchans($n) oc
    lappend oc [irctolower $chan]
    nick_case $n
}
proc msg_PART {p c chan} {
    prefix_nick
    recordlastseen_n $n "leaving $chan" 1
    process_kickpart $chan $n
}
proc msg_QUIT {p c why} {
    prefix_nick
    recordlastseen_n $n "leaving ($why)" 0
    nick_forget $n
}

proc msg_PRIVMSG {p c dest text} {
    prefix_nick
    if {[ischan $dest]} {
        recordlastseen_n $n "invoking me in $dest" 1
        set output $dest
    } else {
        recordlastseen_n $n "talking to me" 1
        set output $n
    }
    nick_case $n

    if {[catch {
        regsub {^! *} $text {} text
        set ucmd [ta_word]
        set procname ucmd/[string tolower $ucmd]
        if {[catch { info body $procname }]} {
            error "unknown command; try help for help"
        }
        $procname $p $dest
    } rv]} {
        sendprivmsg $n "error: $rv"
    } else {
        manyset $rv priv_msgs pub_msgs priv_acts pub_acts
        foreach {td val} [list $n $priv_acts $output $pub_acts] {
            foreach l [split $val "\n"] {
                sendaction $td $l
            }
        }
        foreach {td val} [list $n $priv_msgs $output $pub_msgs] {
            foreach l [split $val "\n"] {
                sendprivmsg $td $l
            }
        }
    }
}

proc msg_INVITE {p c n chan} {
    after 1000 [list sendout JOIN $chan]
}

proc grep {var predicate list} {
    set o {}
    upvar 1 $var v
    foreach v $list {
        if {[uplevel 1 [list expr $predicate]]} { lappend o $v }
    }
    return $o
}

proc msg_353 {p c dest type chan nicklist} {
    global names_chans nick_onchans
    if {![info exists names_chans]} { set names_chans {} }
    set chan [irctolower $chan]
    lappend names_chans $chan
    channel_noone_seen $chan
    foreach n [split $nicklist { }] {
        regsub {^[@+]} $n {} n
        if {![string length $n]} continue
        check_nick $n
        upvar #0 nick_onchans($n) oc
        lappend oc $chan
        nick_case $n
    }
}

proc msg_366 {p c args} {
    global names_chans nick_onchans
    if {[llength names_chans] > 1} {
        foreach n [array names nick_onchans] {
            upvar #0 nick_onchans($n) oc
            set oc [grep tc {[lsearch -exact $tc $names_chans] >= 0} $oc]
            if {![llength $oc]} { nick_forget $n }
        }
    }
    unset names_chans
}

proc ta_anymore {} {
    upvar 1 text text
    return [expr {!![string length $text]}]
}

proc ta_nomore {} {
    upvar 1 text text
    if {[string length $text]} { error "too many parameters" }
}

proc ta_word {} {
    upvar 1 text text
    if {![regexp {^([^  ]+) *(.*)} $text dummy firstword text]} {
        error "too few parameters"
    }
    return $firstword
}

proc ta_nick {} {
    upvar 1 text text
    set v [ta_word]
    check_nick $v
    return $v
}

proc def_ucmd {cmdname body} {
    proc ucmd/$cmdname {p dest} "    upvar 1 text text\n$body"
}

proc ucmdr {priv pub args} {
    return -code return [concat [list $priv $pub] $args]
}

proc loadhelp {} {
    global help_topics

    catch { unset help_topics }
    set f [open helpinfos r]
    try_except_finally {
        set lno 0
        while {[gets $f l] >= 0} {
            incr lno
            if {[regexp {^#.*} $l]} {
            } elseif {[regexp {^ *$} $l]} {
                if {[info exists topic]} {
                    set help_topics($topic) [join $lines "\n"]
                    unset topic
                    unset lines
                }
            } elseif {[regexp {^!([-+._0-9a-z]*)$} $l dummy newtopic]} {
                if {[info exists topic]} {
                    error "help $newtopic while in $topic"
                }
                set topic $newtopic
                set lines {}
            } elseif {[regexp {^[^!#]} $l]} {
                set topic
                lappend lines [string trimright $l]
            } else {
                error "eh ? $lno: $l"
            }
        }
        if {[info exists topic]} { error "unfinished topic $topic" }
    } {} {
        close $f
    }
}

def_ucmd help {
    upvar #0 help_topics([irctolower [string trim $text]]) info
    if {![info exists info]} { ucmdr "No help on $text, sorry." {} }
    ucmdr $info {}
}

def_ucmd ? {
    global help_topics
    ucmdr $help_topics() {}
}

proc manyset {list args} {
    foreach val $list var $args {
        upvar 1 $var my
        set my $val
    }
}

proc check_username {target} {
    if {
        [string length $target] > 8 ||
        [regexp {[^-0-9a-z]} $target] ||
        ![regexp {^[a-z]} $target]
    } { error "invalid username" }
}

proc nickdb__head {} {
    uplevel 1 {
        set nl [irctolower $n]
        upvar #0 nickdb($nl) ndbe
        binary scan $nl H* nh
        set nfn users/n$nh
        if {![info exists ndbe] && [file exists $nfn]} {
            set f [open $nfn r]
            try_except_finally { set newval [read $f] } {} { close $f }
            if {[llength $newval] % 2} { error "invalid length" }
            set ndbe $newval
        }
    }
}

proc def_nickdb {name arglist body} {
    proc nickdb_$name $arglist "nickdb__head; $body"
}

def_nickdb exists {n} {
    return [info exists ndbe]
}

def_nickdb delete {n} {
    catch { unset ndbe }
    file delete $nfn
}

set default_settings {timeformat ks}

def_nickdb set {n args} {
    global default_settings
    if {![info exists ndbe]} { set ndbe $default_settings }
    foreach {key value} [concat $ndbe $args] { set a($key) $value }
    set newval {}
    foreach {key value} [array get a] { lappend newval $key $value }
    set f [open $nfn.new w]
    try_except_finally {
        puts $f $newval
        close $f
        file rename -force $nfn.new $nfn
    } {
    } {
        catch { close $f }
    }
    set ndbe $newval
}

proc opt {key} {
    global calling_nick
    if {[info exists calling_nick]} { set n $calling_nick } { set n {} }
    return [nickdb_opt $n $key]
}

def_nickdb opt {n key} {
    global default_settings
    if {[info exists ndbe]} {
        set l $ndbe
    } else {
        set l $default_settings
    }
    foreach {tkey value} $l {
        if {"$tkey" == "$key"} { return $value }
    }
    error "unset setting $key"
}

proc check_notonchan {} {
    upvar 1 dest dest
    if {[ischan $dest]} { error "that command must be sent privately" }
}

proc nick_securitycheck {strict} {
    upvar 1 n n
    if {![nickdb_exists $n]} { error "you are unknown to me, use `register'." }
    set wantu [nickdb_opt $n username]
    if {![string length $wantu]} {
        if {$strict} {
            error "that feature is only available to secure users, sorry."
        } else {
            return
        }
    }
    upvar #0 nick_username($n) nu
    if {![info exists nu]} {
        error "nick $n is secure, you must identify yourself first."
    }
    if {"$wantu" != "$nu"} {
        error "you are the wrong user - the nick $n belongs to $wantu, not $nu"
    }
}

def_ucmd who {
    if {[ta_anymore]} {
        set target [ta_word]; ta_nomore
        set myself 1
    } else {
        prefix_nick
        set target $n
        set myself [expr {"$target" != "$n"}]
    }
    upvar #0 nick_case([irctolower $target]) nc
    set nshow $target
    if {[info exists nc]} {
        upvar #0 nick_onchans($nc) oc
        upvar #0 nick_username($nc) nu
        if {[info exists oc]} { set nshow $nc }
    }
    if {![nickdb_exists $target]} {
        set ol "$nshow is not a registered nick."
    } elseif {[string length [set username [nickdb_opt $target username]]]} {
        set ol "The nick $nshow belongs to the user $username."
    } else {
        set ol "The nick $nshow is registered (but not to a username)."
    }
    if {![info exists nc] || ![info exists oc]} {
        if {$myself} {
            append ol "\nI can't see $nshow on anywhere."
        } else {
            append ol "\nYou aren't on any channels with me."
        }
    } elseif {![info exists nu]} {
        append ol "\n$nshow has not identified themselves."
    } elseif {![info exists username]} {
        append ol "\n$nshow has identified themselves as the user $nu."
    } elseif {"$nu" != "$username"} {
        append ol "\nHowever, $nshow is being used by the user $nu."
    } else {
        append ol "\n$nshow has identified themselves to me."
    }
    ucmdr {} $ol
}

def_ucmd register {
    prefix_nick
    check_notonchan
    set old [nickdb_exists $n]
    if {$old} { nick_securitycheck 0 }
    switch -exact [string tolower [string trim $text]] {
        {} {
            upvar #0 nick_username($n) nu
            if {![info exists nu]} {
                ucmdr {} \
 "You must identify yourself before using `register'.  See `help identify', or use `register insecure'."
            }
            nickdb_set $n username $nu
            ucmdr {} {} "makes a note of your username." {}
        }
        delete {
            nickdb_delete $n
            ucmdr {} {} "forgets your nickname." {}
        }
        insecure {
            nickdb_set $n username {}
            if {$old} {
                ucmdr {} "Security is now disabled for your nickname !"
            } else {
                ucmdr {} "This is fine, but bear in mind that people will be able to mess with your settings.  Channel management features need a secure registration." "makes an insecure registration for your nick."
            }
        }
    }
}

proc timeformat_desc {tf} {
    switch -exact $tf {
        ks { return "Times will be displayed in seconds or kiloseconds." }
        hms { return "Times will be displayed in hours, minutes, etc." }
        default { error "invalid timeformat: $v" }
    }
}

proc def_setting {opt show_body set_body} {
    proc set_show/$opt {} "
        upvar 1 n n
        set opt $opt
        $show_body"
    if {![string length $set_body]} return
    proc set_set/$opt {} "
        upvar 1 n n
        upvar 1 text text
        set opt $opt
        $set_body"
}

def_setting timeformat {
    set tf [nickdb_opt $n timeformat]
    return "$tf: [timeformat_desc $tf]"
} {
    set tf [string tolower [ta_word]]
    ta_nomore
    set desc [timeformat_desc $tf]
    nickdb_set $n timeformat $tf
    ucmdr {} $desc
}

def_setting security {
    set s [nickdb_opt $n username]
    if {[string length $s]} {
        return "Your nick, $n, is controlled by the user $s."
    } else {
        return "Your nick, $n, is not secure."
    }
} {}

def_ucmd set {
    prefix_nick
    check_notonchan
    if {![nickdb_exists $n]} {
        ucmdr {} "You are unknown to me and so have no settings.  (Use `register'.)"
    }
    if {![ta_anymore]} {
        set ol {}
        foreach proc [lsort [info procs]] {
            if {![regexp {^set_show/(.*)$} $proc dummy opt]} continue
            lappend ol [format "%-10s %s" $opt [set_show/$opt]]
        }
        ucmdr {} [join $ol "\n"]
    } else {
        set opt [ta_word]
        if {[catch { info body set_show/$opt }]} {
            error "no setting $opt"
        }
        if {![ta_anymore]} {
            ucmdr {} "$opt [set_show/$opt]"
        } else {
            nick_securitycheck 0
            if {[catch { info body set_set/$opt }]} {
                error "setting $opt cannot be set with `set'"
            }
            set_set/$opt
        }
    }
}

def_ucmd identpass {
    set username [ta_word]
    set passmd5 [md5sum "[ta_word]\n"]
    ta_nomore
    prefix_nick
    check_notonchan
    upvar #0 nick_onchans($n) onchans
    if {![info exists onchans] || ![llength $onchans]} {
        ucmdr "You must be on a channel with me to identify yourself." {}
    }
    check_username $username
    exec userv --timeout 3 $username << "$passmd5\n" > /dev/null \
            irc-identpass $n
    upvar #0 nick_username($n) rec_username
    set rec_username $username
    ucmdr "Pleased to see you, $username." {}
}

def_ucmd summon {
    set target [ta_word]
    ta_nomore
    check_username $target
    prefix_nick

    upvar #0 lastsummon($target) ls
    set now [clock seconds]
    if {[info exists ls]} {
        set interval [expr {$now - $ls}]
        if {$interval < 30} {
            ucmdr {} \
 "Please be patient; $target was summoned only [showinterval $interval]."
        }
    }
    regsub {^[^!]*!} $p {} path
    if {[catch {
        exec userv --timeout 3 $target irc-summon $n $path \
                [expr {[ischan $dest] ? "$dest" : ""}] \
                < /dev/null
    } rv]} {
        regsub -all "\n" $rv { / } rv
        error $rv
    }
    if {[regexp {^problem (.*)} $rv dummy problem]} {
        ucmdr {} "The user `$target' $problem."
    } elseif {[regexp {^ok ([^ ]+) ([0-9]+)$} $rv dummy tty idlesince]} {
        set idletime [expr {$now - $idlesince}]
        set ls $now
        ucmdr {} {} {} "invites $target ($tty[expr {
            $idletime > 10 ? ", idle for [showintervalsecs $idletime]" : ""
        }]) to [expr {
            [ischan $dest] ? "join us here" : "talk to you"
        }]."
    } else {
        error "unexpected response from userv service: $rv"
    }
}

proc md5sum {value} { exec md5sum << $value }

def_ucmd seen {
    global lastseen nick
    prefix_nick
    set ncase [ta_nick]
    set nlower [irctolower $ncase]
    ta_nomore
    set now [clock seconds]
    if {"$nlower" == "[irctolower $nick]"} {
        error "I am not self-aware."
    } elseif {![info exists lastseen($nlower)]} {
        set rstr "I've never seen $ncase."
    } else {
        manyset $lastseen($nlower) realnick time what
        set howlong [expr {$now - $time}]
        set string [showinterval $howlong]
        set rstr "I last saw $realnick $string, $what."
    }
    if {[ischan $dest]} {
        set where $dest
    } else {
        set where {}
    }
    upvar #0 lookedfor($nlower) lf
    if {[info exists lf]} { set oldvalue $lf } else { set oldvalue {} }
    set lf [list [list $now $n $where]]
    foreach v $oldvalue {
        if {"[irctolower [lindex $v 1]]" == "[irctolower $n]"} continue
        lappend lf $v
    }
    ucmdr {} $rstr
}

if {![info exists sock]} {
    set sock [socket $host $port]
    fconfigure $sock -buffering line
    #fconfigure $sock -translation binary
    fconfigure $sock -translation crlf

    sendout USER blight 0 * $ownfullname
    sendout NICK $nick
    fileevent $sock readable onread
}

loadhelp

#if {![regexp {tclsh} $argv0]} {
#    vwait terminate
#}