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CONTRIBUTING.md

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How to Contribute

We'd love to get patches from you!

Workflow

The workflow that we support:

  1. Fork util
  2. Check out the develop branch
  3. Make a feature branch (use git checkout -b "cool-new-feature")
  4. Make your cool new feature or bugfix on your branch
  5. Write a test for your change
  6. From your branch, make a pull request against twitter/util/develop
  7. Work with repo maintainers to get your change reviewed
  8. Wait for your change to be pulled into twitter/util/develop
  9. Merge twitter/util/develop into your origin develop
  10. Delete your feature branch

Testing

We've standardized on using the ScalaTest testing framework. Because ScalaTest has such a big surface area, we use a restricted subset of it in our tests to keep them easy to read. We've chosen the assert API, not the Matchers one, and we use the FunSuite mixin, which supports xUnit-like semantics.

We encourage our contributors to ensure Java compatibility for any new public APIs they introduce. The easiest way to do so is to provide Java compilation tests and make sure the new API is easily accessible (typing X$.MODULE$ is not easy) from Java. These compilation tests also provide Java users with testable examples of the API usage. For an example of a Java compilation test see VarCompilationTest.java.

Note that while you will see a Travis CI status message in your pull request, this may not always be accurate, and in any case all changes will be tested internally at Twitter before being merged. We're working to make Travis CI more useful for development, but for now you don't need to worry if it's failing (assuming that you are able to build and test your changes locally).

Style

We generally follow Effective Scala and the Scala Style Guide. When in doubt, look around the codebase and see how it's done elsewhere.

Comments should be formatted to a width no greater than 80 columns.

Files should be exempt of trailing spaces.

We adhere to a specific format for commit messages. Please write your commit messages along these guidelines. Please keep the line width no greater than 80 columns (You can use fmt -n -p -w 80 to accomplish this).

One line description of your change (less than 72 characters)

Problem

Explain the context and why you're making that change.  What is the
problem you're trying to solve? In some cases there is not a problem
and this can be thought of being the motivation for your change.

Solution

Describe the modifications you've done.

Result

What will change as a result of your pull request? Note that sometimes
this section is unnecessary because it is self-explanatory based on
the solution.

Code Review

The Util repository on GitHub is kept in sync with an internal repository at Twitter. For the most part this process should be transparent to Util users, but it does have some implications for how pull requests are merged into the codebase.

When you submit a pull request on GitHub, it will be reviewed by the Util community (both inside and outside of Twitter), and once the changes are approved, your commits will be brought into the internal system for additional testing. Once the changes are merged internally, they will be pushed back to GitHub with the next release.

This process means that the pull request will not be merged in the usual way. Instead a member of the Util team will post a message in the pull request thread when your changes have made their way back to GitHub, and the pull request will be closed (see this pull request for an example). The changes in the pull request will be collapsed into a single commit, but the authorship metadata will be preserved.

Please let us know if you have any questions about this process!