#!/bin/bash
shopt -s nullglob

if [[ -z $(which feh) ]]
then
    echo "wallpaper err: Can not found command feh." > ~/i3wm-wallpaper.err
    exit 127
fi

#===change these config start===

#wallpapers directory
path=~/Pictures/wallpapers

#time interval
interval=15m

#===change these config end===

cd $path

while true
do
	files=()

	for i in *.jpg *.png; do
		[[ -f $i ]] && files+=("$i")
	done
	range=${#files[@]}

	((range)) && feh --bg-scale "${files[RANDOM % range]}"

	sleep $interval
done

# another script  refer https://wiki.archlinux.org/index.php/Feh_(%E7%AE%80%E4%BD%93%E4%B8%AD%E6%96%87)
# while true; do
# 	find ~/.wallpaper -type f \( -name '*.jpg' -o -name '*.png' \) -print0 |
# 		shuf -n1 -z | xargs -0 feh --bg-scale
# 	sleep 15m
# done