local event = require("signal")()

event:on(function()
    print("I've been fired! 🚀")
end)

event:fire()
--> "I've been fired! 🚀"

If you are using luarocks, just run:

luarocks install signalise

Copy the signal.lua file somewhere where your Lua interpreter will be able to find it and require it accordingly:

local signal = require("signal")

local event = signal.new()

or

local event = signal()

Creates and returns the event. It must be captured in a variable a in order for the events to take place.

• event is the object that must be used to perform the events - see the "Event methods" section below.

event:fire([...])

Triggers the event, allowing for connections to run once until the event is fired again.

• event - An event returned by signal.new
• ... - The optional arguments to be used for the connections

local connection = event:attach(callback)

Executes the given callback function whenever the connected event gets fired with the event.fire method.

• event - An event returned by signal.new
• callback - Must be a function, exectuted when the event gets fired
• connection - The returned connection

local connection = event:once(callback)

Works almost identically to event.fire, but only fires once before self detaching.

• event - An event returned by signal.new
• callback - Must be a function, exectuted when the event gets fired
• connection - The returned connection

connection:detach()

Concludes the usage of the given connection object.

• connection is the object that is fundamental for executing callbacks

Install busted & luacheck luarocks install busted && luarocks install luacheck and run:

$ busted
$ luacheck signal.lua

This library is free software; you can redistribute and/or modify it under the terms of the MIT license. See LICENSE for details.