Move Brittany plugin from HIE

[fendor]

Trivial translation, need to re-use existing parsing result instead of parsing it brittany again.

• Implement Tests
• Add AGPL flag
• Prefer direct cradle over stack for executing tests

[alanz]

The mechanics look good.

The tests need to be updated though, there are some original ones that I brought over that have been commented out.

Also, very important, we need to put a flag around it so it can be disabled by people who do not want to have to depend on AGPL code.

There are plenty of examples out there, e.g. https://hackage.haskell.org/package/ghc-exactprint

[fendor]

Tests need to be refactored and fixed, but they are there already

[fendor]

Also, ditches stack as our primary test runner.

[alanz]

This looks good, thanks.

There does not seem to be a CI report for it?

And your summary indicates it is not done yet?

[fendor]

some of the summary can not easily be adressed yet.
We can not move brittany code to use pPrintModule, since we can not obtain the Anns parameter which we get from ghc-exactprint, afaict, and we do not have this parsing artefact.
Moreover, the given API can not be used for formatting only a selection.
However, I would like to adress that in follow-up PRs, including providing a patch to brittany to enable range formatting.

[alanz]

I am happy to merge this as use, it is a straight migration of the existing brittany plugin. Best to do one thing only in a PR.

Changes to the API to re-use the existing ParsedSource is a separate task. And is likely to require changes to ghcide to enable generation of API Annotations.