def talk(x)
    system("echo '#{x}' | festival --tts")
end

def lid_closed?
    return true if open("/proc/acpi/button/lid/LID0/state").read.split(" ").last != "open"
end

def lid_state_toggled?
    prev_lid_state = open("/proc/acpi/button/lid/LID0/state").read.split(" ").last 
    while true
      sleep(1)
      lid_state = open("/proc/acpi/button/lid/LID0/state").read.split(" ").last
      return true if lid_state!=prev_lid_state
    end
end
      
while true
      if lid_state_toggled?
        if lid_closed?
          talk "Come back soon"
        else
          talk "Welcome back !"
        end
      end
end