#!/bin/sh
#
# wallchanger
# send bugs or suggestions to maurom1982@yahoo.com.ar


WALLPAPERS=/usr/share/backgrounds
TIMER=
GNOME=
XFCE=
OPTIONS=scaled


show_help() {
    echo "Usage: $0 [-g|-x] [-f FOLDER] [-o MODE] [-w NN]"
    echo
    echo "  -g          set GNOME wallpaper"
    echo "  -x          set XFCE wallpaper"
    echo "  -f FOLDER   choose from wallpapers in FOLDER"
    echo "  -o MODE     set wallpaper mode [none|wallpaper|centered|SCALED|stretched|zoom]"
    echo "  -w NN       change wallpaper every NN seconds [defaults to once]"
    echo
    exit 0;
}

new_wallpaper() {
    local CHOSEN
    CHOSEN=`find "$WALLPAPERS" -iname \*.jpg -print | shuf -n 1`
    if [ -z "$CHOSEN" ]; then
        echo "No wallpapers to choose from in $WALLPAPERS"
        exit 1
    fi
    if [ "$GNOME" = yes ]; then
        gconftool-2 -s -t string /desktop/gnome/background/picture_options  $OPTIONS
        gconftool-2 -s -t string /desktop/gnome/background/picture_filename $CHOSEN
    elif [ "$XFCE" = yes ]; then
        #xfconf-query -c xfce4-desktop -p /backdrop/screen0/monitor0/image-style -s $OPTIONS
        xfconf-query -c xfce4-desktop -p /backdrop/screen0/monitor0/image-path  -s $CHOSEN
    else
        show_help
    fi
}


while true; do
    case "$1" in
        -h) show_help; break ;;
        -g) GNOME=yes; shift ;;
        -x) XFCE=yes; shift ;;
        -f) shift; WALLPAPERS=$1; shift ;;
        -o) shift; OPTIONS=$1; shift ;;
        -w) shift; TIMER=$1; shift ;;
        *) break ;;
    esac
done

if [ -z "$TIMER" ]; then
    new_wallpaper
else
    while true; do
        new_wallpaper
        sleep $TIMER
    done
fi