Add project-file config option to cabal cradle

[jneira]

• Like we added stack-yaml for the stack cradle
• It could be used to workaround for Cabal cradle causes me to constantly need to run cabal configure #195 (and other issues?)
• And the api would be symmetric between both tools

[fendor]

I don't think it would help with #195, because cabal uses the same dist-newstyle directory, afaict.

[jneira]

Oh, you are right: https://cabal.readthedocs.io/en/latest/cabal-project.html#cmdoption-builddir. There is an open issue about: haskell/cabal#5271
So to workaround that we should add a builddiroption, for both stack and cabal and use it when executing them.

[fendor]

Adding a builddir option feels like a temporary hack for something that should be fixed eventually by asking for the relevant information directly. I want to avoid adding fields that should become obsolete at some point in the future.

[jneira]

So cabal-build-info will not generate any build products that may be in another location? is it a pure query of a preexisting build, without trigger any cabal command?

[fendor]

It triggers a configure, and builds dependencies if necessary, iirc. It is not a pure query.

EDIT: sorry for the late response.