Get the list of top sites for a given country from Alexa

alexatopsites.rb

# Get the list of top sites for a given country from Alexa, found here:
# http://www.alexa.com/topsites/countries/<country code>
# and transform it into a nice text file, one domain per line.
# Supply the country code as the first argument. Defaults to US.
require 'rubygems'
require 'open-uri'
require 'nokogiri'

BASE_URL = "http://www.alexa.com/topsites/countries"
country = ARGV[0] || "US"

def parse_page(url, outfile)
  doc = Nokogiri::HTML(open(url))
  domains = doc.css(".topsites-label").map(&:inner_text)
  domains.each {|domain| outfile.puts domain }
end

outfile = File.open(ARGV[1] || "alexatop500.#{country}.txt", 'w')
0.upto(20) do |page|
  url = BASE_URL + (page > 0 ? ";#{page}" : "" ) + "/#{country}"
  puts "Parsing page #{page + 1} at #{url}"
  parse_page(url, outfile)
end
outfile.close
puts "Written to #{outfile.path}"