lastfm-mpd-related.sh

#! /bin/bash
#
# 2007-10-07 15:25
#
# Dynamic playlist for MPD
#
# Gets list of artists from last.fm which are similar to
# currently playing. Preselected number (default 5) of songs
# from those artists are added to the playlist if they are
# found from the mpd's music collection.
#
# Author: Juhamatti Niemelä <juhamatti.niemela@iki.fi>


# Requirements:
#  mpc
#  rl
#  wget
#  grep
#  sed
#
# Grep and wget shoud be included in your distribution as default.
# Debian/Ubuntu users are able to install rest with command:
#   sudo apt-get install randomize-lines mpc wget

# How many new songs will be added at once
NEWNUM=5

# Shuffle mode off
mpc random off
# Crops playlist to contain only the current song
mpc crop

while [ true ]; do
  OLD=$CURR
  CURR=`mpc --format "Current: [%artist% - ][%title%]" \
	| grep Current | sed -e "s/Current: //"`
  if [ "$OLD" != "$CURR" ]; then
    ARTIST=`mpc --format "A: [%artist%]" | grep "A:" | sed -e "s/A: //"`
    SIMILAR=`wget --quiet -O - \
	"http://ws.audioscrobbler.com/1.0/artist/$ARTIST/similar.txt" \
	| sed -e "s/[^,]*,[^,]*,\(.*\)/\1/" | sed -e "s/\&amp;/\&/g"`
    ORIGIFS=$IFS
    IFS=`echo -en "\n\b"`
    # Loop through randomized artist list and select one random song per
    # artist until $NEWNUM is reached
    COUNT=0
    FOUND=""
    for i in $SIMILAR; do
	TEMP=`mpc search artist $i`
	if [ ! -z "$TEMP" ]; then
	  TEMP=`echo -ne "$TEMP" | rl -c 1 -`
	  COUNT=$[$COUNT + 1]
	  FOUND=`echo -e "$FOUND\n$TEMP"`
	fi
	if [ $COUNT -eq $NEWNUM ]; then
	  break
	fi
    done
    IFS=$ORIGIFS
    echo -ne "$FOUND" | mpc add
  fi
  sleep 5
done

Sadly every mpd related lastfm randomizer I've found hasn't worked. Sometimes new API's suck. LOL. :(