#! /usr/bin/env sh

if [ -f "$HOME/.local/etc/x/chwp" ]
then
	. "$HOME/.local/etc/x/chwp"
fi

directory=${CHWP_BASEDIR:-$HOME/pictures/wallpapers}
size=${CHWP_SIZE:-1920x1080}
timeout=${1:-0}
walldir=$directory/$size

if [ ! -d "$walldir" ]
then
	printf "%s\n" "No such directory: $walldir" >&2
fi

# If no timeout was set, just change it once
if [ "$timeout" -eq 0 ]
then
	find "${walldir}" -type f -print0 | shuf -n1 -z | xargs -0 feh --bg-fill
	exit 0
fi

# Otherwise, change it every so often
while :
do
	find "${walldir}" -type f -print0 | shuf -n1 -z | xargs -0 feh --bg-fill
	sleep "${timeout}"
done