Ilda Khaki wrote:

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.

that's just a side effect of the engines dafaulting to some plain name i.e. tex->plain.fmt, pdftex->pdftex.fmt, luatex->luatex.fmt, etc

so, although luatex can use a plain.fmt format, in practice it would be luatex.fmt (now that we have engine subpaths a non-clashing plain.fmt would be posible but that's all dependent of the cnf file)

concerning plain itself ... i guess that in most macropackages you can use plain-like macros; it would be interesting to know what functionality plain offers that macro packages don't provide too; the main advantage of plain is that it's small and very stable, but any luatex related font code will make plain way bigger, slower and less stable

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.

it would probably also need something

\input a-lot-of-extra-lua-code

\font\test=zar.ttf[plus enabling arabic features] scaled\magstep0

and probably more since plain tex is meant as basis for typesetting an english book and not arabic

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