add random song from mpd

mpc_add

#!/bin/bash

# stdin check
if (( "$#" < 2 )); then
  echo "Usage: `basename $0` HOSTNAME MIN_PLAYLIST_LENGTH PLAYLIST [NEXT_ON_ERROR (y/N)]"
  exit 65
fi

# variables
host=$1
length=$2
playlist="$3"
state_file="$host.state"

export MPD_HOST=$host

if [ "$3" ]; then
echo Playlist: $playlist;
  playlist_items=`mpc -f %file% playlist $playlist | wc -l`
echo Playlist_items: $playlist_items
fi

if [ "$4" ]; then
  cont=${4^^}
  cont=${cont:0:1}
else
  cont="N"
fi

# go go go
echo "Mpd_Add v.0.6"
echo "Host: $host / Playlist length: $length"
echo "Next on error: $cont"

# loop
loop () {
 while true; do
  if `mpc version 2>/dev/null | grep -q 'mpd version:'`; then
    setState
        
    while (( `mpc playlist | grep -c ^` < $length )); do
      if [ "$playlist_items" ]; then
	echo adding songPL;
	addSongPl;
      else
 	echo adding normal song;
	      addSong;
      fi
            
      sleep 1
    done

    mpc idle &>/dev/null
  else
    sleep 30
  fi
 done
}

# output current status to file
# does conversion from utf8 to iso-8859-15 for compatability
#+with samurize on windows
setState() {
 if `mpc | grep -q '\[playing\]'`; then
  mpc --format "%artist% (%date%) %album% / %track% / %title%" current | iconv -s -c -f UTF-8 -t iso-8859-15 -o $state_file
 elif `mpc | grep -q '\[paused\]'`; then
  echo "pause" > $state_file

  if `mpc | grep -q 'single: on'`; then
    mpc -q single off && mpc -q stop && echo "not playing" > $state_file
  fi
 else
  if [ $cont = "Y" ]; then
    mpc -q play
  else
    echo "not playing" > $state_file
  fi
 fi
}

# add one random song from mpd library
addSongPl () {
 song=`mpc -f %file% playlist $playlist | sed -n $[RANDOM % $playlist_items+1]p`
 echo Song: $song
 if [ "$song" ]; then
  mpc -q add "$song"
 fi
}
addSong () {
 song=`mpc -f %file% listall | sed -n $[RANDOM % $(mpc stats | grep Songs | awk '{print $2}')+1]p`
 echo Song: $song
 if [ "$song" ]; then
  mpc -q add "$song"
 fi
}

# backgrounds the loop and exits main thread
loop 
exit 0

mpd_add_random.sh

#!/bin/sh
# add one random song from mpd library
addSong () {
 song=`mpc listall | sed -n $[RANDOM % $(mpc stats | grep Songs | awk '{print $2}')+1]p`

if [ "$song" ]; then
 mpc -q add "$song"
fi
}
addSong