[luatex] macros to invoke lua in LaTeX

[Taco Hoekwater]

Karl Berry wrote:
> 
> P.S. The answer to the various questions of "when does this ever cause a
> problem" is simple: any existing latex document that issues the
> perfectly reasonable construct \newcommand{\primitive}{...} fails.

Which nicely demonstrates that LaTeX was designed with a completely
frozen engine in mind (but I'll shut up about it now).

Best wishes,
Taco