Failing The Build Scalafmt

[borkaehw]

1. Have an independent macro that users set up in addition to their scalafmt_scala_library targets which looks something like:

def scala_fmt_test(name,target):
    native.sh_test(
        name = name + "_scala_fmt_test",
        srcs = [target + ".format-test"],
    )

2. Have scalafmt_scala_library actually be a macro that delegates to _scalafmt_scala_library_rule and scala_fmt_test.
3. If you want this to be toggled via a toolchain then you can do something like 2 but instead of using a regular sh_test you can write one of your own that will depend on the toolchain.

Reference from https://github.com/bazelbuild/rules_scala/pull/912#issuecomment-578927303

[ittaiz]

Thanks! Can you elaborate on 3? The rule will use the toolchain to decide it to run the action or not?

[gergelyfabian]

This would be very useful. In fact rules_scala implementation from higherkindness provides a similar feature: https://github.com/higherkindness/rules_scala/blob/master/docs/scalafmt.md#scalafmt.

[virusdave]

I don't suppose anyone has made this work? I also went down the "create a wrapping sh_test that invokes the foo.format-test path, and ran into the same issue of missing manifest file (and, presumably, the formatted output files)