#!/bin/sh
# sh-pulse --- Control script for pulseaudio volume and output sink
# Copyright © 2024 Runciter <runciter@pkbd.org>
#
# This file is part of sh-pulse.
#
# sh-pulse is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or (at
# your option) any later version.
#
# sh-pulse is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with sh-pulse.  If not, see <http://www.gnu.org/licenses/>.

declare -a SINKS=($(pactl list short sinks | awk '{print $1}'))

if test "x${#SINKS[@]}" = x0
then
    echo no sinks found, are you running pulseaudio?
    exit 1
fi
declare -a SINKNAMES=($(pactl list short sinks | awk '{print $2}'))

declare -a INPUTS=($(pactl list short sink-inputs | awk '{print $1}'))
declare -a INPUTSINKS=($(pactl list short sink-inputs | awk '{print $2}'))
if test "x${#INPUTS[@]}" = x0
then
    echo no inputs found, setting first sink as default sink
    IS=0
    pactl set-default-sink ${SINKNAMES[$IS]}
else
    for (( I=0; I<${#SINKS[@]}; ++I ))
    do
        if test "x${INPUTSINKS[0]}" = "x${SINKS[$I]}"
        then
            IS=$I
        fi
    done
fi

case "$1" in
    increase)
        if test "x$2" = "x"
        then
            pactl set-sink-volume ${SINKS[$IS]} "+5%"
        else
            pactl set-sink-volume ${SINKS[$IS]} $2
        fi
        ;;
    decrease)
        if test "x$2" = "x"
        then
            pactl set-sink-volume ${SINKS[$IS]} "-5%"
        else
            pactl set-sink-volume ${SINKS[$IS]} $2
        fi
        ;;
    togglemute)
        pactl set-sink-mute ${SINKS[$IS]} toggle
        ;;
    nextsink)
        if test "x$(( ${IS}+1))" = "x${#SINKS[@]}"
        then
            IS=0
        else
            IS=$(($IS+1))
        fi
        pactl set-default-sink ${SINKNAMES[$IS]}
        for (( I=0; I<${#INPUTS[@]}; ++I ))
        do
            pactl move-sink-input ${INPUTS[$I]} ${SINKS[$IS]}
        done
        ;;
    *)
        echo "Usage: vlm {increase [INC]|decrease [INC]|togglemute|nextsink}"
        echo "  Volume increment INC is given as is to pactl."
        echo "  Default INC is +5% for increase, -5% for decrease."
        echo "  nextsink cycles audio outputs e.g. sound cards, usb, ..."
        exit 2
        ;;
esac
exit 0