Ignoring events

[george_____t 0]

Basically I have a program which, among other things, registers an event listener with:

event.listen("modem_message",move)

I would like it to only respond once to receiving a message, but unfortunately each time I run the program it registers a 'new' listener, so it runs 'move' multiple times. So I tried to set it to unregister the listener at the start of the program, using:

event.ignore("modem_message",move)

But this doesn't work, seemingly because the current definition of 'move' is treated as different to the definition which was registered as a listener. So how would I go about removing the registered listener?

 

p.s. I'm currently rebooting the computer each time I need to rerun the program, which is mostly when I change the definition of move, but this is rather annoying.

[mpmxyz 27]

Maybe you can use something like that:

local event = require("event")
local computer = require("computer")

local TEST = tostring(...)

local function move(...)
  print(TEST, ...) --your code
end

--This function removes the listener when the next program pushes the signal "update_listeners"
local function removeListener()
  event.ignore("modem_message", move)
  --removes this function
  return false
end
--This function adds the listener.
local function addListener()
  event.listen("modem_message", move)
  --The internal list of listeners is updated after all listeners have been executed.
  --That means that the following function will not be executed in this step:
  event.listen("update_listeners", removeListener)
  --removes this function
  return false
end

event.listen("update_listeners", addListener)
computer.pushSignal("update_listeners")