Get first web search result as Markdown link

luckyduck.rb

#!/usr/bin/ruby
require 'net/http'

def e_url(string)
	string.gsub(/([^a-zA-Z0-9_.-]+)/n) do
		'%' + $1.unpack('H2' * $1.size).join('%').upcase
	end
end

def do_search(phrase)
	res = Net::HTTP.get(URI.parse("http://duckduckgo.com/?q=%5C#{e_url(phrase)}"))
	match = res.match(/window.location.replace\('(.*?)'\)/)
	return match.nil? ? false : match[1]
end

ARGF.each do |input|
	res = do_search(input.strip)
	print %Q{[#{input.strip}](#{res.strip})}
end