Re: Function calling amongst scripts

[Gavin Kistner <gavin@...>]

On Jul 17, 2006, at 2:44 PM, Nick Tourte wrote:
>   This seems like a simple thing to do, but I can't seem to get it  
> to work or find the answer. You can call dofile in a script to load  
> and execute the main body of another script, and you can call  
> loadfile to load the main body into a function and run it upon a  
> function call; but I can't seem to find a way to call a function  
> that is registered in another such script. I have also tried using  
> require, but I don't know enough about lua packages to properly set  
> it up and call the function. How do you go about calling a function  
> from another script in a running script? Is there a way through Lua  
> directly? Routing it thru c++ isn't an option, because it's not  
> always known what user types have to be pushed onto the stack  
> (we're using a lot of different types).

Creating a global variable that points to a function object,  
including creating the function literal, is itself code that must be  
run in order to result in a function object that can be used.

[Sliver:~/Desktop] gkistner$ cat foo.lua
function foo( )
        print( 'yay' )
end

[Sliver:~/Desktop] gkistner$ lua
Lua 5.1  Copyright (C) 1994-2006 Lua.org, PUC-Rio
> =foo
nil
> dofile( 'foo.lua' )
> =foo
function: 0x309780
> foo( )
yay

Trickier people than me may be able to tell you how to change the  
environment so that dofile() fills out a different global, in which  
you may look for your function as a key.