Add random songs to MPD playlist

November 21, 2012

This post was automagically converted from Blogger. There may be dragons. Check any code you copy.

The first part puts currently playing song in a text-file for use in other programs. The second part adds random songs while there is less than 3 songs in the playlist. This probably isn’t optimized or even good, to be frank, but it works. ^^

Update 1: As I have more than one mpd server running I figured it’d be more efficient catching the hostname as well as minimum tracks from stdin.
Update 2: Checks if we actually got a song to add as mpc add "" adds ALL the songs in your library.
Update 3: Cleaned up the code. Added NEXT_ON_ERROR to keep going if MPD stops while trying to play a song.
Update 4: Now backgrounds itself automagically. Also, functions are neat.
Update 5: Comments and exit 0.

#!/bin/bash

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

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

export MPD_HOST=$host

if [ "$3" ]; then
  cont=${3^^}
  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
      addSong
                  
      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
addSong () {
 song=`mpc listall | sed -n $[RANDOM % $(mpc stats | grep Songs | awk '{print $2}')+1]p`

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

# backgrounds the loop and exits main thread
loop &
exit 0