#!/bin/sh

# how much should we
# in-/decrement at a time?
VOLUME_STEP="1"
# interrupt signal
SIGNAL="10"
# status bar program
STATUS="scells"

case $1 in
	"inc")
		wpctl set-volume $2 "${VOLUME_STEP}"%+ &&
			pkill -SIGRTMIN+"${SIGNAL}" "${STATUS}"
		;;

	"dec")
		wpctl set-volume $2 "${VOLUME_STEP}"%- &&
			pkill -SIGRTMIN+"${SIGNAL}" "${STATUS}"
		;;

	"tgl")
		wpctl set-mute $2 toggle &&
			pkill -SIGRTMIN+"${SIGNAL}" "${STATUS}"
		;;

	*)
		echo "Usage: $0 <action> <dev>"
		echo "<action> is one of:"
		echo "inc  increase <dev>'s volume by \${VOLUME_STEP}"
		echo "dec  decrease <dev>'s volume by \${VOLUME_STEP}"
		echo "tgl  toggle <dev>'s mute state"
		;;
esac