set-volume

#! /bin/sh

XOB=/tmp/xobpipe

if [ "$1" = "--help" ] || [ "$1" = "-h" ] || [ "$1" = "help" ] || [ -z "$1" ]; then
  cat <<EOF
$ set-volume.sh COMMAND
Set the volume and send a notification.

Commands:
  mute: toggle mute
  +<n>: raise volume
  -<n>: lower volume

Example:
  $ set-volume.sh +5
  $ set-volume.sh -5
  $ set-volume.sh mute
EOF
  exit
fi

command -v pulsemixer >/dev/null || { echo "pulsemixer is not installed"; exit 1; }

COMMAND="$1"

get_active_sink() {
  if RUNNING_SINKS="$(pactl list sinks short | grep -F 'RUNNING' -m1)"; then
    echo $RUNNING_SINKS | tail -n1 | awk '{ print $1 }'
  else
    case "$(cat /etc/hostname)" in
      *x240) echo 1;;
      *x270) echo 0;;
      *e495) echo 0;;
      *) echo 0;;
    esac
  fi
}
notification() {
  PROPS="$(pactl list sinks | grep -F "Sink #$SINK" -A 32)"

  MUTE=$(echo $PROPS | grep -F "Mute: no" >/dev/null && echo 0 || echo 1)

  VOL="$(echo $PROPS | grep -Po '\d+%' )"
  VOL="$(echo $VOL | awk -F % '{print $1}' )"
  [ -z "$VOL" ] && VOL=0

  echo mute: $MUTE, vol: $VOL

  IS_MUTE=""
  [ "$MUTE" -eq 1 ] && IS_MUTE=!

  if [ -p $XOB ]; then
    echo "$VOL$IS_MUTE"
    echo "$VOL$IS_MUTE" >$XOB
  fi
}

SINK="$(get_active_sink)"
echo "using sink: $SINK"

case "$COMMAND" in
  mute) pactl set-sink-mute "$SINK" toggle ;;
  +*|-*) pactl set-sink-volume "$SINK" "${COMMAND}%" ;;
  *) echo Invalid command, see --help ;;
esac

notification

# MPD=~/scripts/mpd
# if [ "$(cat $MPD/mpd-server-status)" -gt 0 ]; then
#   if $MPD/is-mpd-playing; then # nested for performance
#     echo ok # control mpd server instead of local volume as long as music is playing
#   fi
# fi