#!/usr/bin/zsh
nvidia_dev='/dev/nvidia0'
pidfile='/tmp/compton.pid'

if [[ -r $pidfile ]]; then
	read pid < $pidfile
	rm $pidfile
	if kill $pid; then
		exit 0
	fi
fi

if [[ -e $nvidia_dev ]]; then
	gpu_opts=
else
	gpu_opts=(--dbe --vsync opengl --backend xrender)
fi
compton $gpu_opts[@] -cGC -t-5 -l-5 -r4 -o.55 &
pid=$!
if [[ -n $pid ]]; then
	printf '%s' $pid > $pidfile
else
	exit 1
fi
disown
exit 0