CS2D 
Lua function subscriptions
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subscriptions = {}
function subscribe(fn_i, fn)
if type(fn_i) == "string" then
if type(_G[fn_i]) == "function" and type(fn) == "function" then
local _fn = _G[fn_i]
_G[fn_i] = function(args)
local _r = fn(args)
if _r then return _r end --Cancels the default behavior
return _fn(args)
end
if not subscriptions [fn_i] then subscriptions [fn_i] = {} end
subscriptions [fn_i][fn] = _fn
local key = math.random(100000)
while subscriptions [fn_i][key] do
key = math.random(100000)
end
subscriptions [fn_i][key] = _fn
return key
else
return nil
end
else
return nil
end
end
function unsubscribe(ifn, fn)
if not subscriptions [ifn] then return false end
if not (subscriptions [ifn][fn]) then return false end
_G[ifn] = subscriptions [ifn][fn]
end
So for example, if you want to make the print() function print "Nothing to print" whenever you just call print() without any parameters, you just have to do this.
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print("--Subscribing to the event--")
key = subscribe("print", function(str) if not str then print("Nothing to Print"); return true end end)
print()
print("Some stuff to print")
print("--Unsubscribing to the event--")
unsubscribe("print",key)
print()
print("Some stuff to print")
Output has written
--Subscribing to the event--
Nothing to Print
Some stuff to print
--Unsubscribing to the event--
Some stuff to print
Nothing to Print
Some stuff to print
--Unsubscribing to the event--
Some stuff to print
