[Dev-luatex] Very simple sample?

David Kastrup dak at gnu.org
Sat May 12 12:06:32 CEST 2007

olli at sopos.org writes:

> I'm new to both luatex and this list and I hope my question is in the
> scope of this list:
> Javier Bezos wrote in
> http://www.ntg.nl/mailman/private/dev-luatex/2006-December/000265.html
>> Taco:
>>> This is the simplest solution:
>>>   \let\\\relax
>>>   \directlua0{tex.print("\\uppercase{hello}");}
>>:-/ Too ad hoc, but it helped, as I understood what's
>>going on. So I tried:
>>  \detokenize{tex.print("\\section{Hola $\\sin a_0^2$}");}}
>>Seems to work.
> I tried to wrap this in a \startlua -- \endlua pair, but this fails:
> \def\startlua{\directlua0\expandafter\bgroup\detokenize\bgroup}
> \def\endlua{\egroup\egroup}
> \startlua
>     tex.print("\\uppercase{Hallo Welt}")
> \endlua
> If I replace the "\endlua" with "}}", it works.  I even messed around with
> \catdoc`\}=12 and things like that, but didn't succeed.

You are thinking too complicated.  \detokenize requires a
brace-matched input anyway which is scanned using current catcodes, so
you gain nothing at all by circumventing premature argument scanning.

So you can just do
and that's it.

David Kastrup, Kriemhildstr. 15, 44793 Bochum

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