EventMachine respond to one character from stdin

gistfile1.rb

require "eventmachine"
require "highline/import"

def get_user_input
  input = HighLine.new
  c = ask('') { |q| q.character = true; q.echo = false }
  # Do something
  print c
  get_user_input
end

EM.run {
  EM.defer do
    get_user_input
  end
  puts "Just test, that reactor is not blocked."
}