Get IntelliJ working for the new build

[olafurpg]

In #454 we refactored the build to escape the wrath of ++ and sbt-doge. Now the entire build stays within the task graph, even for cross-builds. This new build is significantly easier to reason about and is less fragile, but it seems it's no longer possible to run the tests or compile the project from IJ.

Here's how my "Modules" looks like

No matter if I reload, IJ still says build.sbt has changed and requires a refresh

When trying to run the tests from IJ, I get a missing dependency error even if difflib is a dependency of diff-sources (but it's not a dependency of diffJVM~1

It seems BuildInfo in src_managed of the unit project is neither picked up I was able to fix this by manually adding src_managed to "Sourcesofunit-sources` project

cc/ @jastice any idea what is happening?

[jastice]

I reproduced the problem, it seems to be that sourceDirectories in sbt are configured to be a subdirectory of .cross:

[IJ]> unit/sourceDirectories
[info] * /Users/jast/playspace/scalafix/.cross/unit/src/main/scala-2.12
[info] * /Users/jast/playspace/scalafix/.cross/unit/src/main/scala
[info] * /Users/jast/playspace/scalafix/.cross/unit/src/main/java
[info] * /Users/jast/playspace/scalafix/scalafix-tests/unit/src/main/scala
[info] * /Users/jast/playspace/scalafix/.cross/unit/target/scala-2.12/src_managed/main

... while actually they are under the root. IntelliJ uses the sourceDirectories setting to mark directories appropriately. Not sure what you're doing here :)

[olafurpg]

Can you explain how you would expect sourceDirectories to look like?

[master] scalafix: show coreJVM/sourceDirectories
[info] * /Users/ollie/dev/scalafix/.cross/core/jvm/src/main/scala-2.12
[info] * /Users/ollie/dev/scalafix/.cross/core/jvm/src/main/scala
[info] * /Users/ollie/dev/scalafix/.cross/core/jvm/src/main/java
[info] * /Users/ollie/dev/scalafix/.cross/core/shared/src/main/scala-2.12
[info] * /Users/ollie/dev/scalafix/.cross/core/shared/src/main/scala
[info] * /Users/ollie/dev/scalafix/scalafix-core/shared/src/main/scala
[info] * /Users/ollie/dev/scalafix/scalafix-core/jvm/src/main/scala
[info] * /Users/ollie/dev/scalafix/.cross/core/jvm/target/scala-2.12/src_managed/main
[master] scalafix: show coreJVM/sourceDirectory
[info] /Users/ollie/dev/scalafix/.cross/core/jvm/src

We have this unorthodox setup to avoid ++. Our build has a mix of 2.10 only, 2.11/2.12 cross-build and dotty only projects. Compile in some 2.11/2.12 cross-built projects have task depend on compile in dotty/2.10 only projects, which triggered intellij to fail update.

[jastice]

For IDEA to pick up the directory with BuildInfo as source dir, either you would have to configure sbt-buildinfo to generate the file to <build root>/.cross/unit/target/scala-2.12/src_managed/main, or add the directory that it is generated to the sourceDirectories, i.e. <build root>/target/scala-2.12/src_managed/main

[olafurpg]

Thanks for the input @jastice The build seems to import fine now for some reason, no idea what changed.