[Dev-luatex] Very simple sample?

[Javier Bezos]

Hello,

I'm trying to use \directlua, but until now all
may attempts failed. I begun with:

\documentclass{book}
\begin{document}
\directlua0{tex.print("\uppercase{hello}");}
\end{document}

and then wrapped \directlua with every combination
possible of \texscantokens, \luaescapestring,
\scantokens and so on, but nothing seems to work
(no errors, but I get "uppercase" printed, perhaps
with dashes and quotes, and of course "hello" still
in lower case).

Please, could you provide an example showing what
I should do. Are \directlua and tex.print the right
commands to use?

Thanks
Javier