How catch new globals?

["J. Perkins" <starkos@...>]

This is my first foray back into Lua since the 4.0 days...quite a bit
has changed I see. I am porting some old code to Lua 5 and I'm stuck
trying to replace a "getglobal" tag method.

My 4.0 code looked like this:

   lua_pushcfunction(L, getglobal);
   lua_settagmethod(L, LUA_TNIL, "getglobal");

For 5.0 I tried to do this:

   lua_pushvalue(L, LUA_GLOBALSINDEX);
   lua_getmetatable(L, -1);
   lua_pushstring(L, "newindex");
   lua_pushcfunction(L, getglobal);
   lua_settable(L, -3)

But my function never gets called. I also tried "index", "__newindex",
and "__index", but no avail.

FYI, what I am trying to do is catch statements of the form:

   package.name = "MyPackage"

...where `package` hasn't been defined yet. My function will create a
table, populate a few values, and then setglobal("package") before
returning.

I'm sure this is easy, but I couldn't seem to come up with the right
Google words to find an answer. Perhaps it is so basic and obvious
that no one else needed to ask :p

Thanks for the help,

Jason