installation-ide.adoc: mill.bsp.BSP/install

[sideeffffect]

Instructions to run mill.bsp.BSP/install. Without it, IntelliJ won't pick up the BSP model -- it won't show it as one of the possible ways how to import the project.

[lihaoyi]

I havent needed to do this for a clean checkout for maybe a year now

[lihaoyi]

do you have a repro i can look at where running this command is necessary?

[sideeffffect]

When you open the project as just a mere directory, IntelliJ doesn't prompt you to import -- regardless of whether with BSP or Maven or anything. You just see this and nothing happens.
scala-mill-experiment.zip

[lihaoyi]

The issue seems to be that IntelliJ uses the presence a ./mill bootstrap script in order to detect it as a Mill build. After adding such a bootstrap script the intellij auto import seems to work

[lihaoyi]

We can probably send a patch upstream to intellij-scala to make it a bit more flexible. In the meantime, this command may be useful to fix some of the misbehaviors I've seen when intellij gets into a bad state. Let me try to reproduce them to see

[sideeffffect]

presence [of] a ./mill bootstrap script in order to detect it as a Mill build

Would you say it is more robust to rather detect Mill via detecting

• build.mill or
• build.mill.scala or
• mill.scala
• (did I forget any other case?)

[lihaoyi]

@sideeffffect should be these cases

• ./mill
• ./build.mill
• ./build.mill.scala

Maybe ./millw or ./millw.bat from https://github.com/lefou/millw?

[sideeffffect]

We may not need this PR if this gets merged

• Mill support: enable importing projects which contain build.mill(.scala) but not wrapper script JetBrains/intellij-scala#674

[lefou]

Superseded by #3989