Fixed auto-link web search for Markdown Service Tools

gistfile1.rb

require 'net/http'
require 'net/https'
require 'openssl'
require 'uri'

def fetch_with_redirect(uri_str, limit = 10)
   return nil if limit==0

   uri = URI.parse(uri_str)
   http = Net::HTTP.new(uri.host, uri.port)
   http.use_ssl = uri.scheme == 'https'
   http.verify_mode = OpenSSL::SSL::VERIFY_NONE
   request = Net::HTTP::Get.new uri.request_uri
   response = http.request request

   if response.is_a? Net::HTTPRedirection
      location = response['location']
      fetch_with_redirect(location, limit - 1)
   else
      response.body
   end
end

ARGF.each do |input|
   res = fetch_with_redirect("https://duckduckgo.com/?q=%5C#{URI.escape(input)}%2F")
   if res
      match = res.strip.match(/URL='(.*?)'/)
      unless match.nil?
         print %Q{[#{input.strip}](#{match[1].strip})}
      else
         print input
      end
   else
      print input
   end
end