Module bait

the event emitter

Introduction

Bait is the event emitter for Hilbish. Much like Node.js and its events system, many actions in Hilbish emit events. Unlike Node.js, Hilbish events are global. So make sure to pick a unique name!

Usage of the Bait module consists of userstanding event-driven architecture, but it’s pretty simple: If you want to act on a certain event, you can catch it. You can act on events via callback functions.

Examples of this are in the Hilbish default config! Consider this part of it:

1bait.catch('command.exit', function(code)
2	running = false
3	doPrompt(code ~= 0)
4	doNotifyPrompt()
5end)

What this does is, whenever the command.exit event is thrown, this function will set the user prompt.

Functions


catch(name, cb)	Catches an event. This function can be used to act on events.
catchOnce(name, cb)	Catches an event, but only once. This will remove the hook immediately after it runs for the first time.
hooks(name) -> table	Returns a list of callbacks that are hooked on an event with the corresponding `name`.
release(name, catcher)	Removes the `catcher` for the event with `name`.
throw(name, …args)	Throws a hook with `name` with the provided `args`.

bait.catch(name, cb)

Catches an event. This function can be used to act on events.

Parameters

string name
The name of the hook.

function cb
The function that will be called when the hook is thrown.

Example

1bait.catch('hilbish.exit', function()
2	print 'Goodbye Hilbish!'
3end)

bait.catchOnce(name, cb)

Catches an event, but only once. This will remove the hook immediately after it runs for the first time.

Parameters

string name
The name of the event

function cb
The function that will be called when the event is thrown.

bait.hooks(name) -> table

Returns a list of callbacks that are hooked on an event with the corresponding name.

Parameters

string name
The name of the function

bait.release(name, catcher)

Removes the catcher for the event with name. For this to work, catcher has to be the same function used to catch an event, like one saved to a variable.

Parameters

string name
Name of the event the hook is on

function catcher
Hook function to remove

Example

1local hookCallback = function() print 'hi' end
2
3bait.catch('event', hookCallback)
4
5-- a little while later....
6bait.release('event', hookCallback)
7-- and now hookCallback will no longer be ran for the event.

bait.throw(name, ...args)

Throws a hook with name with the provided args.

Parameters

string name
The name of the hook.

any args (This type is variadic. You can pass an infinite amount of parameters with this type.)
The arguments to pass to the hook.