#!/bin/sh

# daemon's name
DAEMON=scanbd

# securely create temporary file to avoid race condition attacks
TMPFILE=`mktemp /tmp/$DAEMON.XXXXXX`

# lock file
LOCKFILE="/tmp/$DAEMON.lock"

# device name
DEVICE="$2"

# destination of the final image file (modify to match your setup)
DESTINATION="/home/manolis/Desktop/scanned_image.jpg"

# remove temporary file on abort
trap 'rm -f $TMPFILE' 0 1 15

# function: create lock file with scanbuttond's PID
mk_lock() {
    pidof $DAEMON > $LOCKFILE
}

# function: remove temporary and lock files
clean_up () {
    test -e $LOCKFILE && rm -f $LOCKFILE
    rm -f $TMPFILE
}

# function: check if lock file exists and print an error message with zenity (if it's installed)
chk_lock() {
    if [ -e $LOCKFILE ]; then
        if [ -x /usr/bin/zenity ]; then
            zenity --display :0.0 --title="Scanbuttond" --error 
            --text="Another scanning operation is currently in progress."
        fi
        exit 1
    fi
}

# function: the actual scan command (modify to match your setup)
scan() {
    scanimage --device-name "$DEVICE" --mode Color --resolution 300 
            --depth 8 -x 215 -y 297 > $TMPFILE
}

case $1 in
    1)
       # button 1 (scan): scan the picture & save it as $DESTINATION
       chk_lock; mk_lock; scan; convert $TMPFILE -quality 85 -quiet $DESTINATION; clean_up
       ;;
    2)
       # button 2 (copy): scan the picture, convert it to postscript and print it
       chk_lock; mk_lock; scan; convert $TMPFILE ps:- | lpr; clean_up
       ;;
    3)
       # button 3 (mail): scan the picture, save it as $DESTINATION and send it as an e-mail
       # attachment with Evolution
       chk_lock; mk_lock; scan; convert $TMPFILE -quality 85 -quiet $DESTINATION
       evolution --display=:0.0 "mailto:?attach=$DESTINATION"; clean_up
       ;;
    4)
       # button 4 (web): unconfigured
       echo "button 4 has been pressed on $2"
       ;;
esac