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CONTRIBUTING.md

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Contributing to Gremlins

First, thanks for you wanting to contribute, the Gremlins project welcomes contributors!

What can I contribute?

Report bugs

Bug reports are always welcome. Before submitting one, please verify that a similar bug hasn't been already reported. If it already exists, consider to comment there instead of opening a new one.

To submit a good bug report

Use the appropriate template to submit bugs.

  • Use a clear and descriptive title.
  • Describe each step to reproduce using as much detail as you can.
  • Describe the behaviour you observed after following the steps.
  • Explain why it is different from the behaviour you would expect.

Suggest enhancements

Before making a feature request/enhancement request, please verify that there isn't already a request for the same or very similar feature. If a similar enhancement request already exists, you can expand on it via comments. There is a specific issue type for feature requests.

Send pull requests

Pull request are welcome, but it's not guaranteed they will be accepted. We are quite strict on code quality, style and code metrics, bear with us if we ask you to make changes before accepting your PR.

Becoming a contributor

Gremlins is fully developed on GitHub and the best way to contribute is by forking the repository and, once you complete your work, opening a pull request.

Before contributing

All contributions are welcome, but, before submitting any significant change, it is better to coordinate with the Gremlins' team before starting the work. It is a good idea to start at the issue tracker and file a new issue or claim an existing one.

Open an issue

Apart from trivial changes, every contribution to the Gremlins should be linked to an issue. Feel free to propose a change and expose your plans, so that everyone can contribute in its validation, and the chances of your pull request being accepted will increase.

Submit a contribution

Gremlins is released with semantic versioning and follows GitHub flow, with the only difference that we open release branches when there is a fix version to release.

When you open a pull request, a series of automatic checks kicks off. You can verify if your change makes those checks fail and adjust the code accordingly.

At this point, a member of the Gremlins team will review your code, possibly will discuss with you to understand it better, maybe ask for some changes and so on. Please expect that this process will be more thorough if you are a first time contributor: we need to know each other.

Feel free to make more than one commit in your pull request, but bear in mind that once it has been properly reviewed and accepted, all the commits will be squashed into one before merging. This way we can maintain a linear commit history.

Before a release, the code base will be frozen and no pull request will be accepted until the release is done, with the only exception of bug fixes. If you send a pull request during a code freeze, you will have to wait a little more before seeing it merged.

Commit messages

Commit messages follow a convention. Here is an example:

area: do a specific thing

Expand on what and how it is done, possibly spanning multiple lines and
being descriptive.

Fixes #123

First line

This is a short one line summary of what has been done in the commit, prefixed by the package affected (ex. mutator , docs, etc.). The commit message should be written as it is answering the question "This commit changes Gremlins to ..."

The first line is separated from the rest by a blank line.

Message body

The message body expands on the first line, adding details in a descriptive way. Try to use correct grammar and punctuation, and don't use Markdown, HTML or other markup languages.

Reference

If the commit is related to an issue (most of the time it does), you can add a reference in the format KEYWORD #ISSUE_NUMBER. This helps GitHub link the commit to the appropriate issue and update its status.

The recognized keywords are:

  • close
  • closes
  • closed
  • fix
  • fixes
  • fixed
  • resolve
  • resolves
  • resolved

Sometimes the team members as well forget to respect all of these rules, but we do our best to be consistent. If you forget or make mistakes, we will help during the review process.