There's a mvn plugin (sbt as well, but it requires sbt 1.0+) so it should be runnable from the PR builder
Super basic example with a minimal config that's close to current style guide here: https://github.com/apache/spark/compare/master...koeninger:scalafmt I imagine tracking down the corner cases in the config, especially around interactions with scalastyle, may take a bit of work. Happy to do it, but not if there's significant concern about style related changes in PRs. On Wed, Nov 21, 2018 at 2:42 PM Sean Owen <sro...@gmail.com> wrote: > > Yeah fair, maybe mostly consistent in broad strokes but not in the details. > Is this something that can be just run in the PR builder? if the rules > are simple and not too hard to maintain, seems like a win. > On Wed, Nov 21, 2018 at 2:26 PM Cody Koeninger <c...@koeninger.org> wrote: > > > > Definitely not suggesting a mass reformat, just on a per-PR basis. > > > > scalafmt --diff will reformat only the files that differ from git head > > scalafmt --test --diff won't modify files, just throw an exception if > > they don't match format > > > > I don't think code is consistently formatted now. > > I tried scalafmt on the most recent PR I looked at, and it caught > > stuff as basic as newlines before curly brace in existing code. > > I've had different reviewers for PRs that were literal backports or > > cut & paste of each other come up with different formatting nits. > > > > > > On Wed, Nov 21, 2018 at 12:03 PM Sean Owen <sro...@gmail.com> wrote: > > > > > > I think reformatting the whole code base might be too much. If there > > > are some more targeted cleanups, sure. We do have some links to style > > > guides buried somewhere in the docs, although the conventions are > > > pretty industry standard. > > > > > > I *think* the code is pretty consistently formatted now, and would > > > expect contributors to follow formatting they see, so ideally the > > > surrounding code alone is enough to give people guidance. In practice, > > > we're always going to have people format differently no matter what I > > > think so it's inevitable. > > > > > > Is there a way to just check style on PR changes? that's fine. > > > On Wed, Nov 21, 2018 at 11:40 AM Cody Koeninger <c...@koeninger.org> > > > wrote: > > > > > > > > Is there any appetite for revisiting automating formatting? > > > > > > > > I know over the years various people have expressed opposition to it > > > > as unnecessary churn in diffs, but having every new contributor > > > > greeted with "nit: 4 space indentation for argument lists" isn't very > > > > welcoming. > > > > > > > > --------------------------------------------------------------------- > > > > To unsubscribe e-mail: dev-unsubscr...@spark.apache.org > > > > --------------------------------------------------------------------- To unsubscribe e-mail: dev-unsubscr...@spark.apache.org
