wake the hell up! (when you don't have your phone)

alarm.rb

def forever
  i = 0
  while true
    yield i
    i = i + 1
  end
end

def alarm!(msg)
  forever { `say '#{msg}'` }
end

def wait(t)
  puts "alarm at #{t}, now #{Time.now}"
  sleep 1
end

def set_alarm(t, msg='wake up')
  forever do
    return alarm!(msg) if Time.now > t
    wait(t)
  end
end

t = 8.hours.from_now

set_alarm t