updated for duckduckgo as of 2013.07.18

md - Links - Auto-link web search.workflow

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 fetch(uri)
   url = URI.parse(uri)

   loc = false
   r = Net::HTTP.get_response(url)

   if r.code == "301"
	 loc = r.header['location']
     r = Net::HTTP.get_response(URI.parse(r.header['location']))
   end
   r.body
end


ARGF.each do |input|


	res = fetch("http://duckduckgo.com/?q=%5C#{e_url(input)}%2F")

	if res
        match = res.strip.match(/.*url\=(.*?)'/)

		unless match.nil?
			print %Q{[#{input.strip}](#{match[1].strip})}
		else
			print "no match"
			print input
		end
    else
		print input
	end
end