dudelbox/rfidac/data/_mpd_helper

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

# functions
function mpd_play_folder {
  tag = $1
  mkdir -p $music$tag
  # Update the directory timestamp to indicate the last tag seen
  # Touch the file alone will not update the directory timestamp,
  # so we'll need delete and re-create 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_stop {
  $mpc stop
}

function mpd_pause_play {
  if ($mpc | grep -q playing); then # when playing
    $mpc pause
  else 
    $mpc play
  fi 
}

function vol_min {
  mpd_set_volume 5
}

function mpd_med {
  mpd_set_volume 50
}

function mpd_vol_max {
  mpd_set_volume 75
}

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

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