require 'open3'

Open3.popen2('pianobar', 'r+') do |stdin, stdout|
  out = ''
  loop do
    o, i, _ = IO.select([stdout], [stdin], nil, 0.1)
    unless o.first.nil?
      out += o.first.readpartial(8000)
    end
    case out
    when /\n$/
      print out
      out.clear
    when /Username:\ /
      print out
      out.clear
      i.first.write "bluepojo+pandora@gmail.com\n"
    when /Password:\ /
      print out
      out.clear
      i.first.write "supersecret\n"
    when /Select station:\ /
      print out
      out.clear
      i.first.write "#{gets}\n"
    end
  end
end