Serve current directory on next available port

web

#!/usr/bin/env ruby

require 'webrick'
require 'socket'
require 'timeout'


# code from http://stackoverflow.com/questions/517219/ruby-see-if-a-port-is-open/517638#517638
def port_in_use?(port)
  begin
    Timeout::timeout(1) do
      begin
        s = TCPSocket.new('0.0.0.0', port)
        s.close
        return true
      rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH
        return false
      end
    end
  rescue Timeout::Error
  end

  return false
end

def port_above(port)
  while port_in_use?(port)
    port += 1
  end
  port
end

s = WEBrick::HTTPServer.new(:Port         => port_above(3000), 
                            :DocumentRoot => Dir::pwd)

trap("INT") { s.shutdown }

s.start