Re: Arabic typesetting in Plain TeX over LuaTeX

[Wolfgang Schuster <schuster.wolfgang@googlemail.com>]

Am 15.02.2009 um 08:20 schrieb Ilda Khaki:

>>> TeX engines to decide the best one. Can anyone send a samplwe file  
>>> for
>>> typesetting Arabic in Plain TeX over luatex where the alphabets  
>>> are not
>>> isolated?
>>
>> 1. Mixed-up categories: Plain TeX is a macropackage, luaTeX is an  
>> engine.
>
> No. It is not. When someone uses Plain TeX in an engine, he would  
> say Plain
> TeX over the engine-name. It seems you know very little about Plain  
> TeX.

Your question was not clear enough and it's read as you want to compare
TeX (the program) with LuaTeX (the program). You should say Plain TeX in
or with LuaTeX.

>> 4. Without a more precise question I cannot really recommend which  
>> way to
>> go from here.
>
> This is a sample file, I am looking for.
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> \pagedir TRT \bodydir TRT \textdir TRT \pardir TRT
> \font\test=zar.ttf scaled\magstep0
>
> هل انت کیقک؟
> \end
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>
> But I do not know how to define the font so that Arabic alphabets  
> are not
> isolated.

You use in ConTeXt features to enable functions like kerning,  
ligatures etc.

In the higher level interface you do this with "interface=..." but  
with the
font primitive this is done with \font\...=...*featurename and in your  
example

\font\test=zar*arabic scaled\magstep0 \test % you forgot to enable the  
font

Wolfgang

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