[texhax] package option with arguments

[Arno Trautmann]

Hi!

I’m trying to set up a package that has one optional argument. This
option can have several values that can be combined, like

\usepackage[exclude={greek,math}]{package}

Later I want to check if the argument has a certain string in it, in
this case e.g. if ”greek“ is given. I tried it with \in@ but had no
success. This is my code:

\DeclareOptionX{exclude}{\def\excludeoptions{#1}}
\ProcessOptionsX

\in@{greek}{\excludeoptions}
\ifin@ \AtBeginDocument{greek is in}\fi

I use xkeyval for option processing.
\excludeoptions contains the expected string, but I did not manage to
get a true \ifin@, no matter how I used \expandafter or similar things.

Is this a total wrong way to do the task? Is there a tool that does it
less low-leve? I am totally clueless at the moment :(

cheers
Arno

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