Google books embed viewer from isbn code

google_embed.rb

# find isbn numbers with at least partial Google books embed viewer

require 'nokogiri'
require 'open-uri'
require 'json'

# load a with ISBN numbers
a = []

g = 'http://books.google.com/books?jscmd=viewapi&bibkeys='

# editions results is a .csv file containing ISBN data
File.open('editions_results.csv').each_line do |line|
  d = line.split("\t")
  a << d[7]
end

a.delete 0 # .csv file contains header

a.each do |v|
  v = v.split("|")[0] if v =~ /\|/ # multiple isbns may be '|' delimited, use 1st
  next if v.empty?
  doc = Nokogiri::HTML(open(g + v))
  doc.css('p').each do |p|
    c = p.content
    /\{.*\}/.match(c) do |m|
      j = JSON.parse(m[0])
      if j[v] and j[v].has_key? 'preview' and j[v]['preview'] != 'noview'
        puts v
      end
    end
  end
end