I’ve recently been building a similar tool [1] which defines a specification for CLIs, though the goals are slightly different to the tool you mention I think.

I’ve recently been building a similar tool [1] which defines a specification for CLIs, though the goals are slightly different to the tool you mention I think. I just added support for fish as it happens. [1] https://github.com/fujiapple852/claptrap https://github.com/fujiapple852/claptrap