Ability to get dofile path?

[Asko Kauppi <asko.kauppi@...>]

Is there any way from within a .lua file to know its current path (or 
full filename)?

This would be very handy in situations where a 'library' of lua code is 
stored into several source files. Now i'm forced to keep all in one, 
since otherwise the caller would need to provide not only the pathname, 
but also the path separately:

	SC_PATH= "..path.."
	dofile( SC_PATH.."sc_main.lua" )

If dofile arguments (passing arg[1] etc. as for functions) is ever 
going to be included in Lua, it might be a good idea to have 
arg.filename (or arg[0]?) for the full pathname?

-ak