Parses XML dumps from discogs.com and converts it to a nice text format

discogs-dump-parser.rb

#!/usr/bin/env ruby

require "active_support/all"
require "hashie"
require "nokogiri"

if ARGV.blank?
  puts "Usage: #{$0} filename.xml"
  exit 1
end

doc = Nokogiri::XML(open(ARGV.first))

doc.xpath("//release").each do |release_doc|
  release = Hashie::Mash.new(Hash.from_xml(release_doc.to_s)).release

  artists = release.artists.artist
  artists = [artists] unless artists.kind_of?(Array)
  artist = artists.map { |a| a.name }.join(" / ")

  formats = release.formats.format
  formats = [formats] unless formats.kind_of?(Array)

  format = formats.map do |f|
    if f.descriptions
      format_desc = f.descriptions.description
      format_desc = format_desc.join(", ") if format_desc.respond_to?(:each)
      f.name + " " + format_desc
    else
      f.name
    end
  end.join(" / ")

  puts artist.upcase + " - " + release.title + " (" + format + ")"
end