I used to forgot to log off from Kopete when going home after work. So I wrote this script to automatically disconnect Kopete, if hour is eveningish and screensaver is running. It uses DCOP to check for screensaver and to talk to Kopete.

Put this script to crontab and configure username and evening hours.

#!/bin/sh

# This script will wait until screen is blanked and then log off from Kopete
# If it still runs after MORNING_START or before EVENING_START then it exits

# Author: Laas Toom 

# The user, whose dcop we will connect to
DCOP_USER="some-user"

# Where dcop is
DCOP="/opt/kde3/bin/dcop"

kopete_disconnect(){
  $DCOP --all-sessions --user $DCOP_USER kopete KopeteIface disconnectAll
}

# If -f flag is used, then log out forcibly, regardless of screensaver state
getopts f flag
if [ "$flag" == "f" ]
then
  kopete_disconnect
fi

IS_BLANKED="$DCOP --all-sessions --user $DCOP_USER kdesktop KScreensaverIface isBlanked"
HOUR=`date +%k`

# The time when morning starts
MORNING_START=7

# the time when evening starts
EVENING_START=18

# How long to sleep between screensaver polls
SLEEP_TIME="5m"

# while no screensaver, sleep
while [ "`$IS_BLANKED`" == "false" ]
do
  # If in the middle of day, exit
  if [ $HOUR -lt $EVENING_START -a $HOUR -ge $MORNING_START ]
  then
    exit
  fi
  sleep $SLEEP_TIME
done

# If while ended, then screensaver is enabled, so logout
kopete_disconnect