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If that language is Ruby, someone already beat you to it: https://github.com/halst/docopt.rb

It should be easy to port it - docopt is only 366 LOC itself.

wow, great! what is your scripting language?

I use Lua (http://www.lua.org) for personal projects.

I know a tiny bit of Lua. Write me halst@ya.ru or skype "halst." we can discuss your Lua port.