[texhax] Implementing control sequences with key values

[Vafa Khalighi]

You can set parameters with keyval or xkeyval packages. Is there any package
that you can do the same with commands. So for example, you define a
command, say, \direction which has two values RTL and LTR and is used in the
following way:

\direction=RTL or

\direction=LTR

Is it possible to implement these kind of control sequences?

-- 
I prefer the most bloodcurdling death to living with humility. The only
country I am faithful to, is IRAN. Do not denigrate my last moments...
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