changing global environments

[Graham Wakefield <lists@...>]

Hi,

Is there any way to set the environment of a function such that all  
functions it calls will also inherit this environment?  In the  
example below, I change the environment of fmain, which in turn calls  
fsub, but the environment of fsub is unchanged.

I also tried changing the environment in fmain using setfenv(1, e)  
but it still doesn't affect fsub.  Setting the global environment via  
setfenv(0, e) affects everything in the program. Would changing the  
environment via C (LUA_GLOBALSINDEX perhaps?) achieve what I want, or  
is that the equivalent of setfenv(0)?  Basically, is it possible for  
a function to have the environment dynamically bound, or is it fixed  
at creation/setfenv time?

fsub = function()
	print("fsub", getfenv(0), getfenv(1))
	b = 1
end

fmain = function()
	print("fmain", getfenv(0), getfenv(1))
	a = 1
	fsub()
end

e = { __index = getfenv(0) }
setmetatable(e, e)

setfenv(fmain, e)

fmain()

print(a, b)
print(e.a, e.b)

outputs:
fmain	table: 0x1452a450	table: 0x1452f010
fsub	table: 0x1452a450	table: 0x1452a450
nil	1
1	1