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Scalastyle - Developer guide


Want to contribute? Great! Look at the wiki for potential rules to implement, or do one of your own, and implement it.

  1. Read this document.
  2. Fork the repo.
  3. Create a branch (git checkout -b my_new_rule)
  4. Commit your changes (git commit -am "Added NoFooAllowed")
  5. Push to the branch (git push origin my_new_rule)
  6. Create a PR with a link to your branch
  7. Enjoy a coffee and wait


Source control (git & github) & building:

First, fork the repo on github. On, click on the button ‘Fork’ and wait a couple of seconds. This will create your own fork of the git repo. You should always work with this repo, and create Pull Requests to the main scalastyle repo.

To clone the git repo, and check out the master branch:

$ git clone<yourgithubnamehere>/scalastyle.git
$ cd scalastyle

Scalastyle uses sbt to build. To create the distribution, run

$ sbt package

You will need at least version 0.13.6 to build. This will compile the source code and run the tests.

Getting started with development

When you’re developing, it’s pretty much always a good idea to create a local branch and commit to that.

$ git branch my-great-new-checker
  $ git checkout my-great-new-checker
$ ...
  $ create beautiful code
  $ git commit -m "checker to check that my code is great"

Then, when you’ve finished, go onto github, and create a pull request so that the code can be reviewed and pulled into the scalastyle repo.


To run the tests:

$ sbt test

Submitting pull requests

Pull requests are always welcome. To create a pull request, go to your repo, and click on Pull Request. Enter the commit details, and submit it. This will create an issue in github for scalastyle, which will notify the maintainers. The following things make it more likely that we will accept your pull request:

For pull requests, please follow the guidelines in 10 tips for better Pull Requests by Mark Seemann. If you do, they are a lot more likely to get accepted.

What to work on

Please see the set of issues or the Scalastyle WIKI for a list of potential rules.

Maven repo

Snapshots are available from the Sonatype nexus repository: To use, add something like the following to your settings.xml:

  <name>Sonatype OSS</name>