Draft: Add POC for HLS loading multiple components on startup

[fendor]

Powered by hie-bios.

A prototype implementation for loading multiple components on startup using the WIP hie-bios interface: haskell/hie-bios#301

The main feature is the usage of cabal show-build-info, from here: haskell/cabal#7478
To test out this PR, you have to install the linked cabal executable from source.
NB: currently cabal only supports loading projects where the build-type is Simple.

For debugging, take a look at the result of cabal build all in your project, which currently must succeed for show-build-info to succeed.

[fendor]

cc @OliverMadine as this PR touches your GSoC afaict and takes care of haskell/hie-bios#269

[jneira]

so it could be converted to draft?

[fendor]

Ah yes please, on gitlab the prefix works :/

[isovector]

Your CI appears to be blocked by #2016

[pepeiborra]

@OliverMadine have you had a chance to test this PoC? @fendor have you played any further with this?

[fendor]

Will expand on this soon, as s-b-i has changed significantly since this iteration.

[OliverMadine]

@OliverMadine have you had a chance to test this PoC? @fendor have you played any further with this?

Somewhat but I haven't got anything working yet.

@fendor Would it be possible to make a PR to just get everything in place for loading multiple components? I.e 'load a list of components' in HLS even if hie-bios only uses singleton lists for each component for the time being? I'm not sure how possible this is, I'm still looking over these PRs.

[fendor]

Should be possible, what types do you care about?

[OliverMadine]

Should be possible, what types do you care about?

I'm suggesting we separate the work of 'loading multiple components' and 'getting multiple components to load' into different PRs.

I should've been more clear since this is more than just getting types in place, but I guess it should include the changes to CradeAction to use a NonEmpty (and then everything involving loading that non-empty List).

[fendor]

Surpassed by @wz1000's work

[pepeiborra]

Surpassed by @wz1000's work

What work do you mean?

[fendor]

Afaik, wz1000 implemented multiple home units support for GHC 9.4 and has patches for cabal and hie-bios that need to be upstreamed eventually. In any way, this PR has aged quite a bit anyway.