dudelbox/rfidac/data/_mpd_helper

# variables
mpc="/usr/bin/mpc -h $mpd_host"

# functions
function play_folder {
  tag = $1
  mkdir -p /music/$tag
  # Update the directory timestamp to indicate what was the last tag found
  # Touch the file alone will not update the directory timestamp,
  # so we'll need delete and recreate the file
  rm /music/$tag/.lastplay
  touch /music/$tag/.lastplay
  $mpc stop
  $mpc clear
  $mpc add $mpd_folder$tag
  _ensure_volume_10
  $mpc play 
}

function mpd_play {
  $mpc stop
  $mpc clear
  $mpc add "$1"
  _ensure_volume_10
  $mpc play 1
}

function mpd_play_shuffle {
  $mpc stop
  $mpc clear
  $mpc add "$1"
  $mpc shuffle
  _ensure_volume_10
  $mpc play 1
}

function mpd_set_volume {
  if [ -n "$1" ]; then # non-zero length
    $mpc volume $value
  fi
}

function _ensure_volume_10 {
  if (( $($mpc volume | grep -o '...%' | tr -d '%') < 10 )); then
    mpd_set_volume 10
  fi
}