adjust

#!/usr/bin/sh

fail() {
    echo "Invalid argument $1"
    echo
    echo "Usage: adjust [-h|--help] COMMAND ARGUMENT"
    echo
    echo "Available commands:"
    echo "  volume toggle            Toggle mute"
    echo "  volume <+n%|-n%>         <Raise|Lower> volume by n%"
    echo "  brightness <+n%|-n%>     <Raise|Lower> brightness by n%"
    exit 1
}

[ ! -z $1 ] && cmd=$1 || fail "$@ (See help text)"
[ ! -z $2 ] && arg=$2 || fail "$@ (See help text)"

# For example, split +10% -> [+,10%]
amount=0
[ $arg != "toggle" ] \
    && amount=`echo $arg | cut -c 2-` \
    && arg=`echo $arg | cut -c 1`

notify() {
    notify-send.py $1 $2 \
      --hint boolean:transient:true \
      --replaces-process "${1}-popup"
      #--hint string:image-path:video-display \
             #int:has-percentage:`$2` \
}

get_brightness() {
    echo "100 * `brightnessctl g` / `brightnessctl m`" | bc
}

adjust_brightness() {
    case $1 in
        "+") brightnessctl s +${2} && notify Brightness `get_brightness` ;;
        "-") brightnessctl s ${2}- && notify Brightness `get_brightness` ;;
        *) fail "$1 (expected + or -)" ;;
    esac
}

adjust_volume() {
    case $1 in
        "toggle") \
	    pactl -- set-sink-mute 0 toggle \
	    && notify "Mute" `pactl -- get-sink-mute 0 | awk '{ print $2 }'` ;;
        "+" | "-") \
	    pactl -- set-sink-mute 0 0 \
	    && pactl -- set-sink-volume 0 $1$2 \
	    && notify Volume `pactl -- get-sink-volume 0 | awk '{ print $5 }'` ;;
        *) fail "$1 (expected \"toggle\", \"+\" or \"-\")" ;;
    esac
}

case $cmd in
    "brightness") adjust_brightness $arg $amount ;;
    "volume") adjust_volume $arg $amount ;;
    *) fail "$1 (expected \"brightness\" or \"volume\")" ;;
esac