#!/bin/bash
# "a daemon"
echo "PID to be used with kill: $$"

OPTIRUNS='/usr/bin/optirun /usr/bin/optirun32 /usr/bin/optirun64'
OPTIRUNS='/tmp/optirun'
# communication file
fifo="/tmp/bumblebee.fifo"

mkfifo "$fifo"
chmod 620 "$fifo"
chgrp bumblebee "$fifo"

start_x() {
    echo Starting X...
    if [ -e /tmp/.X8-lock ]; then
        echo "Is already running"
    else
        LD_LIBRARY_PATH=/usr/lib/nvidia-current \
            /usr/bin/X \
            -ac -config /etc/X11/xorg.conf.nvidia \
            -sharevts -modulepath /usr/lib/nvidia-current/xorg,/usr/lib/xorg/modules \
            -nolisten tcp :8
        echo Started X
    fi
}
stop_x() {
    echo Stopping X...
    if [ -e /tmp/.X8-lock ]; then
        kill -SIGTERM $(</tmp/.X8-lock)
        echo Stopped X
    else
        echo "Not started."
    fi
}
while :; do
    # for some reason, : < "$fifo" failed
    cat "$fifo" > /dev/null
    # note: the below does not really work since optirun is still active when receiving a message
    if pidof -x $OPTIRUNS; do
        start_x
    else
        stop_x
    fi
done

rm -f "$fifo"