config_sway/bin/sway_volume

#!/bin/bash
source $HOME/.config/sway/bin/sway_helpers
SINK=$(pactl info | grep "Default Sink" | cut -d ' ' -f 3)
APP="pavucontrol"
SOUND=$HOME/.config/sway/bin/drip.ogg

##  helpers
function _toggle() {
  a=$1
  if [ $(pgrep $a) ]; then
    killall $a
  else
    $a &> /dev/null &
  fi
}

## main
if [ -z "$SINK" ]; then
  _log VOLUME ERROR args: $*
  exit 1
fi

case $1 in
  d*)
    pactl set-sink-volume $SINK -5%
    paplay $SOUND &
    ;;
  i*)
    pactl set-sink-volume $SINK +5%
    paplay $SOUND &
    ;;
  m*)
    pactl set-sink-mute $SINK toggle
    paplay $SOUND &
    ;;
  gui)
    _check_app $APP
    _toggle $APP
    ;;
  *)
    echo "invalid command: \"$1\""
    echo "arguments: [decrease|increase|mute|gui]"
    ;;
esac