gistfile1.rb

#coding: utf-8
require 'xmlsimple'
require 'restclient'

class Wiki

  attr_reader :url

  def initialize(search)
    @url = url_for(search)
  end

  def description
    base['Description'].first['content'] rescue 'Нет описания'
  end

  def url
    base['Url'].first['content'] rescue 'http://ru.wikipedia.org'
  end

  def title
    base['Text'].first['content'] rescue 'Нет заголовка'
  end

  def image
    base['Image'].first['source'] rescue 'wiki.jpg'
  end

  private

  def xml
    XmlSimple.xml_in raw
  end

  def raw
    RestClient.get @url
  end

  def url_for(search)
    'http://ru.wikipedia.org/w/api.php?action=opensearch&search='\
    "#{URI.escape(search)}"\
    '&format=xml'
  end

  def base
    xml['Section'].first['Item'].first
  end

end