Awareness of Cabal projects?

[kindaro]

We have the option this that tells cabal-prettify to prettify the cabal file nearby — do the right thing.

• At this time, we call "Cabal" Distribution.Simple.Utils.defaultPackageDesc. It looks for the nearest Cabal file.
• Ideally we should be aware of Cabal projects and prettify all the cabal files in a project, but this will take some work, because the code that works with Cabal projects is buried inside the cabal-install:exe:cabal executable.