#!/bin/bash
# Dependencies: pulseaudio-utils grep coreutils mawk
# Based on http://blog.waan.name/pulseaudio-setting-volume-from-command-line/

# SINK_NAME="`pacmd dump | grep set-sink-volume | awk '{print $2}' | head -1`" # this is auto detect but it may break using the reset action to fix maxed volume at login
SINK_NAME="alsa_output.pci-0000_00_1b.0.analog-stereo"
VOL_STEP="0x01000"

function wait {
    while [ -z "$VOL_NOW" ]; do
        VOL_NOW=`pacmd dump | grep -P "^set-sink-volume $SINK_NAME\s+" | awk '{print $3}'`
        if [ -z "$VOL_NOW" ]; then
            echo "Waiting on volume to become setable (infinite loop on invalid sink name)"
            sleep 0.7
        fi
    done
}

if [ "$1" == "--help" ]; then
    echo "Usage: `basename $0` [ACTION] [SINK] [STEP]"
    echo "Action:"
    echo "   plus      Increase volume by one step"
    echo "   minus     Decrease volume by one step"
    echo "   mute      Toggle volume mute status"
    echo "   reset     Re-apply current volume (useful if you have maxed volume at login)"
    echo "   dump      List sink name(s)"
    echo "   delay     Don't exit till audio is adjustable"
    echo "Sink (Optional):"
    echo "   Default is '$SINK_NAME'"
    echo "   Run '`basename $0` dump' for a list"
    echo "Step (Optional):"
    echo "   Increment to adjust volume by"
    echo "   Default is '$VOL_STEP'"
    echo "Note:"
    echo "   Configure defaults by editing lines 3 and 4 of `dirname $0`/`basename $0`"
    echo "   To set STEP and not SINK use empty quotes for SINK"
    exit
fi

if [ -n "$2" ]; then
    SINK_NAME="$2"
fi
if [ -n "$3" ]; then
    VOL_STEP="$3"
fi

case "$1" in
    plus)
        wait
        VOL_NEW=$((VOL_NOW + VOL_STEP))
        if [ $VOL_NEW -gt $((0x10000)) ]; then
            VOL_NEW=$((0x10000))
        fi
        pactl set-sink-volume $SINK_NAME `printf "0x%X" $VOL_NEW`
    ;;
    minus)
        wait
        VOL_NEW=$((VOL_NOW - VOL_STEP))
        if [ $(($VOL_NEW)) -lt $((0x00000)) ]; then
            VOL_NEW=$((0x00000))
        fi
        pactl set-sink-volume $SINK_NAME `printf "0x%X" $VOL_NEW`
        ;;
    mute)
        wait
        MUTE_STATE=`pacmd dump | grep -P "^set-sink-mute $SINK_NAME\s+" | awk '{print $3}'`
        if [ $MUTE_STATE = no ]; then
            pactl set-sink-mute $SINK_NAME 1
        elif [ $MUTE_STATE = yes ]; then
            pactl set-sink-mute $SINK_NAME 0
        fi
        ;;
    reset)
        wait
        pactl set-sink-volume $SINK_NAME `printf "0x%X" $VOL_NOW`
        ;;
    delay)
        wait
        ;;
    dump)
        SINK="`pacmd dump | grep set-sink-volume | awk '{print $2}'`"
        if [ -z "$SINK" ]; then
            echo "Looks like you are going to have a bad day"
            echo "No Sinks found"
        else
            echo "$SINK"
        fi
        ;;
    *)
        `dirname $0`/`basename $0` --help
esac