VLC metadata to Conky

#!/bin/bash
# I made this script to have vlc metadata in conky
# Just add "${execpi 300 /path-of-this-script/vlc2conky.sh --artist}" to have the artist metadata
# If you have more than one vlc instance the script will work with the first listed by "ps -eF"
# If you change the name of the script don't forget to change the last "grep -v" with the correct name of the script
# Licence : GPL v3
# by Dgellow Jons , 1 September 2010

t=`ps -eF|grep vlc|grep -v grep|grep -v vlc2conky.sh`

# Function to extract the metadata
Extraction()
{
t=${t#*vlc}
metadata=`exiftool -$metadata $t`
metadata=${metadata#*:}
if [ "$metadata" ]; then
    echo $metadata
else
    echo "UNKNOWN"
fi
return
}

if test $# -ne 1; then
    echo "C'thulu's Avatar says : \"Give me one option if you want my services ! GHUAAAAA ! \""
    exit 0
fi

# Test if vlc is running
if [ "$t" ]
then
    # Test the option
    case $1 in
        "--artist")metadata="Artist"
                   Extraction;;
        "--album") metadata="Album"
                    Extraction;;
        "--title") metadata="Title"
                   Extraction;;
        "--file") echo ${t##*/};;
        *) echo "Bad option. --title, --artist or --album"
    esac
else
    echo "VLC is not running"
fi

exit 0