Bazel BSP support

[harpocrates]

I was in the process of migrating a Scala Bazel codebase to use bazel-bsp and accidentally stumbled on the fact that it seems that JetBrains is planning on completely discontinuing that project JetBrains/hirschgarten#223!

Any chance something could be forked under scalameta? The parts that matter to Metals could use some love, but are also relatively simple.

• Bazel aspects get used for extracting out a model of the build graph
• The actual build server then answers most queries using that graph or else by shelling out to bazel

I'm not sure if there are active consumers for the non Java/Scala parts - if that helps, we could consider taking those out.

[tgodzik]

Thanks for letting us know. That's quite unfortunate since we were piggybacking on the fact they decided to use BSP. I think it might be worth to help out with https://github.com/ValdemarGr/mezel instead which is written in Scala. The JetBrains codebase is in Kotlin, so less know to Scala developers and also quite big to continue supporting by us 🤔

On the other hand Mezel is one person project, so might be less mature overall. I certainly need to think about this.

[harpocrates]

Yeah. Let me know where you land on this.I just got a monorepo working nicely with metals through the old 2024 release of bazel-bsp that metals has pinned, so definitely a bummer. As part of that, I did some poking in the Basel-bsp internals and would be probably able to help get it into a standalone state again if needed (maybe even port to scala?)The alternative definitely seems good - I need to try it out though. For my use case, slower and simpler is better than faster but more likely to crash. That said, maintained is better than unmaintained :)

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