#!/bin/bash

# repertoire de fonds d'ecran
export WALLPAPERS="$HOME/wallpapers/"

# lxde
if [ -n "$(pgrep "^lxsession$")" ] ; then
	export DISPLAY=:0
	pcmanfm -w "`find $WALLPAPERS -name '*.jpg' | shuf -n 1`" || echo "Error settings wallpaper"
fi
# gnome 2
#gconftool -t str -s /desktop/gnome/background/picture_filename "`find $WALLPAPERS -name '*.jpg' | shuf -n 1`"
if [ -n "$(pgrep "mate-session")" ] ; then
	# variable DBUS necessaire pour fonctionnement gconftool dans un processus lance hors gnome
	if [ -z $DBUS_SESSION_BUS_ADDRESS ] ; then
		. $HOME/.dbus/session-bus/`cat /var/lib/dbus/machine-id`-0
		export DBUS_SESSION_BUS_ADDRESS
	fi
	gsettings set org.mate.background picture-filename "`find $WALLPAPERS -name '*.jpg' | shuf -n 1`" || echo "Error settings wallpaper"
fi
if [ -n "$(pgrep "gnome-shell")" ] ; then
	# variable DBUS necessaire pour fonctionnement gconftool dans un processus lance hors gnome
	if [ -z $DBUS_SESSION_BUS_ADDRESS ] ; then
		. $HOME/.dbus/session-bus/`cat /var/lib/dbus/machine-id`-0
		export DBUS_SESSION_BUS_ADDRESS
	fi
	# gnome 3
	export GSETTINGS_BACKEND=dconf  
	gsettings set org.gnome.desktop.background picture-uri "file:`find $WALLPAPERS -name '*.jpg' | shuf -n 1`" || echo "Error settings wallpaper"
fi
if [ -n "$(pgrep "awesome")" ] ; then
	# pour que ça marche il faut les variables d'environnement DISPLAY et XAUTHORITY
	# on les trouve dans l'env de dbus dont le pid est $DBUS_SESSION_BUS_PID
	export `strings /proc/$DBUS_SESSION_BUS_PID/environ | grep -w 'XAUTHORITY\|DISPLAY'`
	awsetbg -r $WALLPAPERS
fi
# xfce
if [ -n "$(pgrep "xfce4-session")" ] ; then
	if [ -z $DBUS_SESSION_BUS_ADDRESS ] ; then
		export DISPLAY=:0
		export $(cat /proc/$(pgrep "xfce4-session")/environ | grep -z "^DBUS_SESSION_BUS_ADDRESS=")
	fi
	xfconf-query -c xfce4-desktop -p /backdrop/screen0/monitor0/image-path -s "`find $WALLPAPERS -name '*.jpg' | shuf -n 1`"
fi