Run BuildInfo at compile instead of run.

[dicklieber]

I've been using BuildInfo, works great but it is invoked during run. It would be great if it could generate the BuildInfo.scala file during compile.

I tried various approached, even used ChatGPT to help setup build.mil.

// Force buildInfo to run before compile override def compile = T { val _ = buildInfo() // this triggers generation early super.compile() }

But buildInfo() is not found.

Any ideas?

[lolgab]

Maybe def buildInfoStaticCompiled: Boolean = true is what you want?

[lihaoyi]

That should work. It's worth clarifying why @dicklieber wants it statically compiled though, since there's significant risk of messing up caching if your statically compiled buildinfo contains something like the git version hash (which is not uncommon!). That's the reason we made it a runtime resource in the first place

[lefou]

What @lolgab said should fix it.

  override def buildInfoStaticCompiled = true

I think we didn't make it a runtime resources due to caching issues, but to speed up our build. A runtime resource does not invalidate compilation output.

[lihaoyi]

Yeah, by "messing up caching" I meant if you fell into that common usage pattern Mill suddenly would have a 0% cache hit rate, and everything would get slower. Zinc's incremental compiler helps somewhat, but was still far slower than simply not touching the compiler at all

[dicklieber]

override def buildInfoStaticCompiled = true
Did the trick, thanks.

As to why:
I develop with IntelliJ. If I do a ./mill clean or just delete the out directory. My builds in IntelliJ fail as BuildInfo.scala is missing.
invoking run, of, generates the BuildInfo but is an extra step.

Is there a better way?

[lefou]

Do you use GenIdea or BSP (mill-bsp or bloop)?