mpd-delete-current-song.rb

#!/usr/bin/env ruby

# Sometimes, you realize you have really rubbish songs in your library for some reason.
# This script allows you to get rid of them just by hitting ./mpd-delete-current-song.rb on your command line.
# It will backup the file to TRASH, then remove it from MPD's library and finally skip to next song.

# https://gist.github.com/1341895

require 'socket'
require 'fileutils'

# Most people don't have an actual server to host MPD on, defaults to localhost configuration.
HOST = 'localhost'
PORT = 6600
# Leave blank if you have no password
PASSWORD = ''
LIBRARY = '~/Music'
TRASH = '~/Rejects'

class MPDSocket < TCPSocket
  def open(&args)
    s = open args
    raise "Can't connect!" unless s.gets.chop == 'OK'
    s
  end

  def send(command)
    puts command
    buffer = []
    while line = gets and not ['OK', 'ACK'].include? line.chop
      buffer << line
    end
    buffer = buffer.join
    raise "Did not get OK response for #{buffer}." unless line.chop == 'OK'
    buffer
  end
end

s = MPDSocket.open(HOST, PORT)

# This'll keep the script from locking up if MPD doesn't require a password.
if PASSWORD.length > 0
  s.send "password #{PASSWORD}"
end
song = s.send 'currentsong'
filename = id = ''

# Requires each_line, otherwise ruby 2.0.0_p247 errors out.
song.each_line do |line|
  key, value = line.chop.split(': ', 2)
  filename = value if key == 'file'
  id = value if key == 'Id'
end

raise "WTF" if filename.empty? or id.empty?

# Use File.expand_path() to interpret ~'s.
FileUtils.move File.expand_path("#{LIBRARY}/#{filename}"), File.expand_path("#{TRASH}/")
puts "Trashed #{filename}."

s.send "deleteid #{id}"
puts "Removed ID #{id} form playlist."

s.send "next"

s.close