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Not far from that there's docopt who parses POSIX compliant arguments descriptions.

Is there such a thing as POSIX-compliant argument descriptions? I know POSIX specifies some things about the format of options, but I didn't realize there was a formalized option description language.

Yes. IEEE Std. 1003.1 Utility Conventions

http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_...

This is actually how Docopt happened (Vladimir Keleshev mentioned it in the PyCon UK 2012 talk).

Cool! Thanks for the reference :)

Me neither, I thought docopt was a hardcoded fragile thing, until the author explains everything is almost perfectly defined.

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