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CONTRIBUTING.md

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Contributing to KalmanCpp

The KalmanCpp team encourages community feedback and contributions. Thank you for your interest in making KalmanCpp better! There are several ways you can get involved.

If you are looking for a good way to contribute to the project, please:

Reporting issues and suggesting new features

If you find that the project is not working properly, please file a report using the Bug Report template. Should the template provided not suit your needs, feel free to make a custom Bug Report, but please label it accordingly.

We are happy to hear your ideas for how to further improve KalmanCpp, ensuring it suits your needs. Check the Issues and see if others have submitted similar feedback. You can upvote existing feedback (using the thumbs up reaction/by commenting) or submit a new suggestion.

Finding issues you can help with

Looking for something to work on? Issues marked good first issue are a good place to start.

You can also check the help wanted tag to find other issues to help with. If you're interested in working on a fix, leave a comment to let everyone know and to help avoid duplicated effort from others.

Contributions we accept

We highly appreciate any contributions that help us improve the end product, with a high emphasis being put on any bug fixes you can manage to create and direct improvements which address the top issues reported by users. Some general guidelines:

DOs

  • DO create one pull request per Issue, and ensure that the Issue is linked in the pull request. You can follow the Pull Request Template for this.

  • DO follow our Coding and Style guidelines, and keep code changes as small as possible.

  • DO include corresponding tests whenever possible.

  • DO check for additional occurrences of the same problem in other parts of the codebase before submitting your PR.

  • DO link the issue you are addressing in the pull request.

  • DO write a good description for your pull request. More detail is better. Describe why the change is being made and why you have chosen a particular solution. Describe any manual testing you performed to validate your change.

DO NOTs

  • DO NOT merge multiple changes into one PR unless they have the same root cause.
  • DO NOT merge directly into the master branch.

Submitting a pull request for an approved Issue is not a guarantee it will be approved. The change must meet our high bar for code quality, architecture and performance.

Making changes to the code

Preparing your development environment

To learn how to build the code and run tests, follow the instructions in the README.

Style guidelines

The code in this project uses several different coding styles, depending on the age and history of the code. Please attempt to match the style of surrounding code as much as possible. In new components, prefer the patterns described in the C++ core guidelines.

Code formatting

Run clang-format

Use the following commands from the project's root directory to run clang-format (must be installed on the host system).

1. Run the CMake target for clang-format:

cmake --build build --target clang-format

2. Using clang-format:

# !!! clang-format does not run recursively in subdirectories !!!
# for each .cpp file modified
clang-format -i *.cpp

# for each .h file modified
clang-format -i *.h

# for each .hpp file modified
clang-format -i *.hpp

3. Using TheLartians' Format.cmake:

cmake -Htest -Bbuild/test

# view changes
cmake --build build/test --target format

# apply changes
cmake --build build/test --target fix-format

See Format.cmake for more options.

Testing

Your change should include tests to verify new functionality wherever possible. Code should be structured so that it can be unit tested independently of the UI. Manual test cases should be used where automated testing is not feasible.

Git workflow

The core principle of the project, when it comes to Git workflows is that the master branch should always be in a healthy state which is ready for release. Every commit on master should be deployable on push. To ensure this, pull request must not be made directly on master. Each change should either be made in the development branch (named a variation of development, i.e. dev) or in a separate branch, named as a short summary of the change.

If your change is complex, please clean up the branch history before submitting a pull request. You can use git rebase to group your changes into a small number of commits which we can review one at a time.

When completing a pull request, we will generally squash your changes into a single commit. After confirming that the change works as intended, the branch might be deleted, in order to prevent branch polluting. Please let us know if your pull request needs to be merged as separate commits.

Review process

After submitting a pull request, members of the team will review your code. We will assign the request to an appropriate reviewer (if applicable). Any member of the community may participate in the review, but at least one member of the project team will ultimately approve the request.

Often, multiple iterations or discussions will be needed to responding to feedback from reviewers. Try looking at past pull requests to see what the experience might be like.

Contributor License Agreement

Before we can review and accept a pull request from you, you'll need to sign a Contributor License Agreement (CLA). The CLA ensures that the community is free to use your contributions. Signing the CLA is a manual process, and you need to do it for each pull request made. This is done by checking the boxes in the Pull Request Readiness Checklist of a Pull Request.

IMPORTANT

Checking the aforementioned boxes means that you agree to provide your change and/or code FREE TO USE and SUBJECT TO CHANGES for the entire community!

You don't need to sign a CLA until you're ready to create a pull request. When your pull request is created, it is reviewed by a team member which, if the change is trivial (i.e. you just fixed a typo) will be labelled as cla-not-required. Otherwise, it's classified as cla-required, if not already signed.