itunes_plays_update.rb

require 'nokogiri-plist'
require 'pry'

olddoc = Nokogiri::PList(File.read("old.xml"))
newdoc = Nokogiri::PList(File.read("new.xml"))

oldtracks = olddoc["Tracks"].map{|id, track| track}

newdoc["Tracks"].each do | id, track |

  print "-- #{track['Artist']} / #{track['Album']} -- #{track['Name']}"

  found = oldtracks.find{ |e|
      e["Artist"] && e["Album"] &&
      e["Artist"].downcase == track["Artist"].downcase &&
      e["Album"].downcase == track["Album"].downcase &&
      e["Name"].downcase == track["Name"].downcase &&
      e["Track Type"] == "File" &&
      !e["Play Count"].nil?
      # e["Size"] == track["Size"]
  }

  if found.nil?
    print " -- NOT FOUND>\n"
    next
  else
    print " -- [OK]\n"
  end

  if track['Play Count'].nil?
    track['Play Date']     = found['Play Date']
    track['Play Date UTC'] = found['Play Date UTC']
    track['Play Count']    = found['Play Count']
  else
    track['Play Count'] += found['Play Count'].to_i
  end

  track['Rating'] = found['Rating'] if found['Rating']

  #puts track.to_plist_xml

end

File.open("foo.xml", "w") { |f| f << newdoc.to_plist_xml }

#binding.pry

#newdoc.xpath("//plist/dict/dict").each do | k |
#  binding.pry
#end