Support for casks from other repos

[isker]

Hi. I'd like to use brew-nix to install casks from repos other than https://github.com/Homebrew/homebrew-cask, like https://github.com/nikitabobko/homebrew-tap for example. I'm ignorant about all this, so I don't know if this is easy or hard or impossible to support 🌞.

Thanks!

[MatthiasGrandl]

I am not affiliated with this repo, but I think to achieve this, you would have to parse tap repos and .rb files manually. the brew-api repo just pulls the .json from the main homebrew repo, but such an API doesn't seem to exist for taps.