download all your tracks from last.fm

scrobbles.rb

require 'active_support/all'
require 'open-uri'
require 'nokogiri'
require 'csv'
require 'pry'

LAST_FM_ENDPOINT = 'http://ws.audioscrobbler.com/2.0/'
PAGE_SIZE = 200

def result(username, api_key, page)
  params = {
    method: 'user.getrecenttracks',
    user: username,
    api_key: api_key,
    limit: PAGE_SIZE,
    page: page
  }

  open("#{LAST_FM_ENDPOINT}?#{params.to_query}").read
end

def tracks(username, api_key, page)
  doc = Nokogiri::XML result(username, api_key, page)
  doc.css(:track).map do |track|
    Hash[%i(date name artist album).map do |key|
      value = track.css(key).text
      value = Time.parse(value).to_i if key == :date
      [key, value]
    end]
  end
end

def save(username, api_key, filename, page = 1)
  headers = %i(date name artist album)
  CSV.open(filename, 'a') do |csv|
    csv << headers unless File.size?(filename)
    begin
      last_result = tracks username, api_key, page
      last_result.each do |track|
        csv << headers.map { |key| track[key] }
      end
      puts "#{last_result.size} results"
      page += 1
    end while last_result.size == PAGE_SIZE
  end
end

username = 'narration'
api_key = '974a5ebc077564f72bd639d122479d4b'
filename = './scrobbles.csv'

save username, api_key, filename