> Uwe Brauer <o...@mat.ucm.es> writes:

> Hi Uwe,

> actually, AUCTeX does this job already and asks you if it should
> remember your choice regarding engine.  Check the function
> TeX-check-engine'.  In practice, you should get what you're looking for

The function TeX-check-engine is not interactive and I can't bind it to  key.
> by adding \usepackage{fontspec} to a file of yours and hitting C-c
> C-c'.

Hm, but there are files which require xelatex, but auctex fails to auto
detect it. For example the files found in
https://tex.stackexchange.com/a/197732/76063
like

\documentclass[20pt]{beamer}
\usepackage[utf]{arabxetex}
\begin{document}
\begin{frame}
\frametitle{\textarab{الشريحة الأولى}}

\begin{arab}
\begin{enumerate}
\item نص عربي
\item نص عربي
\end{enumerate}
\end{arab}
\end{frame}
\end{document}
should be compiled with xelatex but does not include
\usepackage{fontspec}.

I am not sure I will remember all the time to add that line to my latex
files in question nor do I find that very convenient for other users.
One could amplify the list of package which requires xelatex for
scanning and automatic detection, but what's about making
TeX-check-engine interactive?

Uwe

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