sbt Feature Request: auto scalafmtSbt on loading

[ches]

• Version: 1.6.0-RC1
• Integration: sbt-scalafmt

Problem

sbt-scalafmt can keep project source formatted with scalafmtOnCompile, but needs a separate step of scalafmtSbt to maintain formatting of the build too.

Through some tricks, neo-sbt-scalafmt made it possible to have automatic formatting of sbt build files when sbt (re)loaded, if scalafmtOnCompile := true was set in the root and the meta build e.g. project/build.sbt.

Expectation

A means of keeping build files in compliance with project standards without need to remember a separate scalafmtSbt, or frustrating contributors with scalafmtSbtCheck failing CI.

Workaround

I haven't played around with onLoad to try to get something working with the current plugin yet, I'll share if something pans out.

Notes

I can understand if sbt-scalafmt maintainers don't feel this is worthwhile and want to close it. It's a nice-to-have after getting used to it with the neo plugin.

[olafurpg]

Thanks for reporting! I am not against having a similar option in the sbt-scalafmt plugin if someone wants to contribute the feature. One thing that needs to be taken care of is to only trigger formatting on reload and on first load. I had heard reports that the neo-scalafmt implementation triggered reformatting on ++SCALA_VERSION, which is slow since the neo scalafmt task depends on update.

[olafurpg]

The sbt plugin now lives in a separate repo, I've moved this ticket to here scalameta/sbt-scalafmt#2