iftex: testing the Prote engine

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iftex is currently testing all the engines, but not Prote (while HiTeX
(HINT) is using Prote...)

The tests need to be available since, for example beamer / pgf, are
testing the engines for the shadows (and the defaults used does not
work correctly).

Here are two diffs against iftex.sty and iftex.tex providing the tests
and the basic explanations.

TIA,
-- 
        Thierry Laronde <tlaronde +AT+ kergis +dot+ com>
                     http://www.kergis.com/
                    http://kertex.kergis.com/
Key fingerprint = 0FF7 E906 FBAF FE95 FD89  250D 52B1 AE95 6006 F40C

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--- /usr/pkg/share/kertex/latex/pkg-misc/iftex.sty	2022-02-04 18:51:48.000000000 +0100
+++ iftex.sty	2024-12-12 13:40:12.602625503 +0100
@@ -93,6 +93,9 @@
 % HiTeX/HINT
 \IFTEX@protected\def\RequireHINT{\IFTEX@Require\ifhint{HINT}\fi}
 
+% Prote
+\IFTEX@protected\def\RequireProte{\IFTEX@Require\ifprote{Prote}\fi}
+
 % As a matter of policy over-write any existing \if*tex macro and set
 % by the tests here.
 
@@ -237,6 +240,14 @@
 \fi
 \IFTEX@let{HINT}{hint}
 
+% Prote
+\begingroup\expandafter\expandafter\expandafter\endgroup
+\expandafter\ifx\csname Proteversion\endcsname\relax
+  \IFTEX@let{prote}{false}
+\else
+  \IFTEX@let{prote}{true}
+\fi
+\IFTEX@let{Prote}{prote}
 
 % Output mode
 % declare as if with \newif

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--- /usr/pkg/share/kertex/latex/pkg-misc/iftex.tex	2022-02-04 18:51:48.000000000 +0100
+++ iftex.tex	2024-12-12 13:46:14.767079872 +0100
@@ -126,6 +126,10 @@
 PDF\TeX). This can be determined using \cs{iftutex}.
 \item[\cs{ifhint}, \cs{ifHINT}]
 True if Hi\TeX\ (HINT output format) is in use.
+\item[\cs{ifprote}, \cs{ifProte}]
+True if a Prote engine is in use. (This means it has \TeX\
+primitives, e\TeX\ primitives, and the additional primitives required
+by \LaTeX.)
 \end{description}
 
 \section{Requiring specific engines}
@@ -147,6 +151,7 @@
 \item[\cs{RequireTUTeX}]
 \item[\cs{RequireTexpadTeX}]
 \item[\cs{RequireHINT}]
+\item[\cs{RequireProte}]
 \end{description}
 
 

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