get title, keywords, description using Anemone.

gistfile1.rb

# -*- encoding: utf-8 -*-
require 'anemone'

Anemone.crawl('http://www.example.jp') do |anemone|
  anemone.on_every_page do |page|
    puts page.url
    puts page.doc.xpath('//head/title/text()').first.to_s if page.doc
    puts page.doc.xpath("//meta[@name='keywords']/@content") if page.doc
    puts page.doc.xpath("//meta[@name='description']/@content") if page.doc
  end
end