SACRED_SPACE="$1"
BLOCKERS="$2"
PERIOD="$3"

scrapePids() {
	for pid in /proc/*; do
	  if [[ "$pid" =~ .*[0-9]*$ ]]; then
	    if grep -E "$BLOCKERS" -q "$pid"/comm; then
	      if [[ "$(readlink "$pid"/cwd)" == "$SACRED_SPACE"* ]]; then
	      	echo "$pid with name $(cat "$pid"/comm) is blocking"
          return 0
        fi
      fi
  	fi
	done
	return 1
}

echo "Starting up for $SACRED_SPACE with blockers $BLOCKERS and polling of $PERIOD"

while true; do

	inotifywait -r -e modify -e move -e create -e delete "$SACRED_SPACE"


	notify-send "smooooth" "config change detected. waiting for blockers to resolve.."
	while scrapePids; do
	  echo "found blocker in $SACRED_SPACE, waiting.."
	  sleep "$PERIOD"
	done

	echo "building system"
	notify-send "smooooth" "rebuilding your nixos config - please stand by"
	temp="$(mktemp -d)"
	build="$temp/system"
	nix build --out-link "$build" "$SACRED_SPACE"#nixosConfigurations."$HOSTNAME".config.system.build.toplevel

	echo "built and linked at $build - attempting to activate system"
	notify-send "smooooth" "activating your new config"
	switch="$build/bin/switch-to-configuration"
	/run/wrappers/bin/pkexec "$switch" switch

	echo "cleaning up"
	rm -r "$temp"

done