Allow trying multiple entries in a multi cradle if the first one fails

[michaelpj]

At the moment, the bare Cabal cradle can't handle components other than the main library component. We can fix this with a multi component where we have a mapping for all the paths to their appropriate components. However, it would be nice to be able to just use this for the components that the bare Cabal cradle can't find.

With @fendor 's help, I tried something like this:

cradle:
  multi:
    - path: ./.
      config:
        cradle:
          cabal:
    - path: ./.
      config:
        cradle:
          cabal:
            - path: ./mylib/test
              component: mylib:mylib-tests

However, it turns out that this will only try the first component that matches a path. So depending which one I put first, either the test component or the library component will work, and the other will give an error.

It would be nice to be able to do something like this.

[fendor]

While I like the general idea of it, it will be a breaking change in the hie.yaml file format.

Although I would hope nobody wrote these kinds of hie.yaml files...

[fendor]

I think this is a suitable issue for Zurihac for whoever is interested!

It should be enough to only modify the function multiCradle
https://github.com/mpickering/hie-bios/blob/master/src/HIE/Bios/Cradle.hs#L276

[fendor]

Since cabal 3.4, this issue is obsolete. Usually cabal repl <filepath> works for every component in a cabal project (assuming build-type: Simple).

Going to close this, feel free to re-open if current situation is unsatisfying.