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CONTRIBUTING.md

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How to contribute

We welcome users' contributions! However, we do have some requests for how contributions should be made. Please read these guidelines in order to avoid surprises down the road.

Choosing something to work on

The issue tracker has a list of items that you can start working on, classified by the labels:

In order to avoid duplication of effort, it's always a good idea to comment on an issue and let everybody know that you intend to work on it.

Opening a new issue

  1. Avoid duplicate reports. Search GitHub and the mailing list for similar or identical issues. Keyword searches for your error messages are usually effective.

  2. The issue may already be resolved. If possible, try to reproduce the issue using most recent development build of bokeh, or even better, by building and installed from the master branch.

  3. Try to include a minimal, self-contained, reproducible test case or example. The more code or data we have to have to reproduce the issue, the less likely we will be able to.

  4. Include relevant system information. At minimum, you should provide output of:

    python -c "import bokeh; print(bokeh.print_versions())"

  5. Include relevent browser information (if the issue is browser-related). Just saying that you use Chrome is generally not sufficient. We may ask you for additional information to reproduce and fix the issue.

  6. Include relevant JavaScript console and/or bokeh-server logs.

  7. If the problem is user interface related, it is always good to include a screenshot.

  8. State the expected behavior.

Creating a pull request (PR)

  1. Make sure that there is a corresponding issue for your change first. If there isn't yet, create one.
  2. Create a fork of the Bokeh repository on GitHub (this is only done before first) contribution).
  3. Create a branch off the master branch with a meaningful name. Preferably include issue number and a few keywords, so that we will have a rough idea what the branch refers to, without looking up the issue. As an example: 786_property_names.
  4. Commit your changes and push them to GitHub.
  5. Create a pull request against the origin's master branch. The PR must have a meaningful title and a message explaining what was achieved, what remains to be done, maybe an example, etc.
  6. We don't accept code contributions without tests. If there are valid reasons for not including a test, please discuss this in the issue.
  7. We will review your PR as time permits. Reviewers may comment on your contributions, ask you questions regarding the implementation or request changes. If changes are requested, don't start a new PR, (push new commits to the existing one). Do NOT rebase, amend, or cherry-pick published commits. Any of those actions will make us start the review from scratch. If you need updates from master, just merge it into your branch.

DOs and DON'Ts

  • DO follow our coding style.
  • DO include new tests when adding new features.
  • DO include regression tests when fixing bugs.
  • DO keep the discussions focused. When a new or related topic comes up it's often better to create new issue than to side track the discussion.
  • DON'T surprise us with big pull requests. Instead, file an issue and start a discussion so we can agree on a direction before you invest a large amount of time.
  • DON'T commit code that you didn't write. If you find BSD license compatible code that you think would be useful to add to this project, file an issue and start a discussion first.