## nasty code

#!/usr/bin/env ruby
require 'rexml/document'

filename = ARGV.first

abort "filename needed" unless filename
abort "file needed" unless File.file?(filename)

data = File.read(filename)

doc = REXML::Document.new(data)

tracks = nil

doc.elements.each('plist/dict/key') do |el|
  if el.text == 'Tracks'
    tracks = el.next_element
  end
end

abort 'no tracks found' unless tracks

song_data = {}

fields = ['Name', 'BPM', 'Artist', 'Album', 'Track ID']

tracks.elements.each('key') do |el|
  track_id = el.text
  track = el.next_element
  track_data = {}
  track.elements.each('key') do |l|
    if fields.include?(l.text)
      track_data[l.text] = l.next_element.text
    end
  end
  song_data[track_id] = track_data
end

playlists = nil
doc.elements.each('plist/dict/key') do |el|
  if el.text == 'Playlists'
    playlists = el.next_element
  end
end

abort 'no playlists found' unless playlists

items = nil
playlists.elements.each('dict/key') do |el|
  if el.text == 'Playlist Items'
    items = el.next_element
  end
end

abort 'no playlist items found' unless items

order = []

items.elements.each('dict') do |dict|
  dict.elements.each('key') do |key|
    if key.text == 'Track ID'
      order.push(key.next_element.text)
    end
  end
end

order.each do |track_id|
  track = song_data[track_id]
  puts track['Name'] + ' --- ' + track['Artist']
end


## output [plain_text]

$ ./itunes_playlist_data.rb ~/Documents/10\ May\ LBCB.xml
Take the "A" Train --- The BBC Big Band
Jive at Five --- Count Basie
Dunkin' a Doughnut --- Andy Kirk
Killin' Jive --- The Cats and the Fiddle
Straighten Up and Fly Right --- The Andrews Sisters
Alfie's Theme --- The Solomon Douglas Swingtet
Everybody Eats When They Come to My House --- Cab Calloway
Jump Session --- Slim and Slam
Jeep Jockey Jump --- Glenn Miller & The AAF Band
Minor Swing --- Boilermaker Jazz Band
For Dancers Only --- The Solomon Douglas Swingtet
One O'Clock Jump --- Benny Goodman
A-Well-A-Take-Um-A-Joe --- Slim Gaillard & His Flat Foot Floogie Boys
You'se a Viper --- Stuff Smith
Look-a There --- Slim and Slam
Blues My Naughty Sweetie Gives to Me --- Sidney Bechet
Love Me or Leave Me --- Sammy Davis, Jr.
O Mary Don't You Weep --- Bruce Springsteen