[luatex] Luatex primitive names

[Ulrike Fischer]

Am Tue, 10 Mar 2009 14:18:18 +0100 schrieb Hans Hagen:

>> Yes, enabling \luatexversion is not so clean and consistent. But I
>> like the idea to have a simple and reliable command to identify the
>> engine. This would avoid problems like the one we got with faulty
>> \pdfoutput-tests. 
 
> \directlua will always be there as it is needed to enable the primitives 
>   so it is a save test

If \directlua is only offered by luatex, then yes. But Manual wrote

"Now I'd rather test for \directlua. *But* if some day Jonathan
include Lua as a scripting language in XeTeX, things will be more
complicated."

and I thought this meant that perhaps \directlua will also be
included in XeTeX. 


-- 
Ulrike Fischer