#!/usr/bin/env bash

if (($# == 0)); then
  data=$(amixer get Master)
  vol=$(echo "$data" | sed -n 's/^.*\[\([0-9]\+\)%.*$/\1/p' | uniq)
  state=$(echo "$data" | grep '\[on\]')
  [[ $state ]] && echo $vol || echo 0
  exit
fi

case $1 in
  [0-9]*) amixer set Master $1 ;;
  [+-])   amixer set Master 5%$1 ;;
  *mute)  amixer set Master $1 ;;
  toggle) amixer set Master toggle ;;
  *)  >&2 echo "Invalid command"
      exit 1
      ;;
esac

# community/xosd
if command -v osd_cat >/dev/null; then
  killall -9 -q osd_cat &>/dev/null
  osd_cat --font="10x20" --delay=2 --color=white --align=center --pos=bottom --barmode=percentage --percentage $($0) &
fi