scalafmt

Head over to the user docs for instructions on how to install scalafmt.

Run all unit tests: sbt test
Run only formatting tests: core/testOnly org.scalafmt.FormatTests.
Write new formatting test: read this doc.
Build docs: sbt readme/run will create the docs, which you can open with open readme/target/scalatex/index.html. Docs are built with Scalatex.
Hack on IntelliJ plugin: see this doc.
Hack on scalafmt: see tutorial.
Hack on SBT plugin: run sbt scripted.
Run jmh benchmarks: ./bin/run-benchmarks.sh.
Run formatter on millions of lines of code: core/test:runMain org.scalafmt.ScalafmtProps (slow, and requires a lot of memory/cpu)
Debug performance: after each test run in FormatTests, a flamegraph report like this one is generated in target/index.html. I usually keep a browser tab open at localhost:3000/target/index.html along with this background process: browser-sync start --server --files "target/*.html". See Browsersync.
intellij/compile:compileIncremental failed? Run downloadIdea to download custom IntelliJ plugin. The download may take a while.

If you'd like to find out how to work on scalafmt, see this tutorial.

The current maintainers (people who can merge pull requests) are:

We strive to offer a welcoming environment to learn, teach and contribute.

Acknowledgements

JProfiler generously supports scalafmt with its full-featured Java Profiler.