#!/bin/bash
# volctl (1) - Wrapper for controlling volume on OSX via applescript.

mute () {
	osascript -e 'set volume with output muted'
}

unmute () {
	osascript -e 'set volume without output muted'
}

mutetoggle () {
	osascript <<TOGGLE
set isMuted to output muted of (get volume settings)
set newMuted to not isMuted
set volume output muted newMuted
TOGGLE
}

setvol () {
	newVolume=$1
	if [ $newVolume -gt 100 ]; then
		newVolume=100
	fi
	if [ $newVolume -lt 0 ]; then
		newVolume=0
	fi

	osascript -e "set volume output volume $newVolume"
	echo "Volume set to $newVolume"
}

volup () {
	currentVolume=$(osascript -e 'return output volume of (get volume settings)')
	setvol $(expr $currentVolume + $1)
}

voldown () {
	currentVolume=$(osascript -e 'return output volume of (get volume settings)')
	setvol $(expr $currentVolume - $1)
}

usage () {
	cat <<USAGE
$(basename $0) - Control OSX volume via applescript
Options:
    -h	  -  Print this help
    -m	  -  Mute volume
    -u    -  Unmute Volume
    -t    -  Toggle mute status
    +N    -  Increase volume by N, to a max of 100
    -N    -  Decrease volume by N, to a minimum of 0
     N    -  Set volume to N
USAGE
}

if [ -n "$1" ]; then
	case $1 in
		-h) usage ;;
		-m) mute ;;
		-u) unmute ;;
		-t) mutetoggle ;;
		+*) volup "${1#+}" ;;
		-*) voldown "${1#-}" ;;
		*)  setvol "$1" ;;
	esac
else
	usage
fi