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CONTRIBUTING.md

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How to Contribute

We'd love to accept your patches and contributions to this project. There are just a few small guidelines you need to follow.

Community Guidelines

This project follows Google's Open Source Community Guidelines.

Contributor License Agreement

Contributions to this project must be accompanied by a Contributor License Agreement (CLA). You (or your employer) retain the copyright to your contribution; this simply gives us permission to use and redistribute your contributions as part of the project. Head over to https://cla.developers.google.com/ to see your current agreements on file or to sign a new one.

You generally only need to submit a CLA once, so if you've already submitted one (even if it was for a different project), you probably don't need to do it again.

Code style

When writing code contributions to the project, please make sure to follow the style guides: The Google C++ Style Guide and the Google Python Style Guide. There are a few small XLS clarifications for local style on this project where the style guide is ambiguous.

Code reviews

All submissions, including submissions by project members, require review. We use GitHub pull requests for this purpose. Consult GitHub Help for more information on using pull requests.

Pull Request Style

We ask contributors to squash all the commits in the PR into a single one, in order to have a cleaner revision history.

Generally, this can be accomplished by:

proj/xls$ # Here we assume origin points to google/xls.
proj/xls$ git fetch origin main
proj/xls$ git merge-base origin/main my-branch-name  # Tells you common ancesor COMMIT_HASH.
proj/xls$ git reset --soft $COMMIT_HASH
proj/xls$ git commit -a -m "My awesome squashed commit message!!!1"
proj/xls$ # Now we can more easily rebase our squashed commit on main.
proj/xls$ git rebase origin/main

Rebased branches can be pushed to their corresponding PRs with --force.

See also this Stack Overflow question.

Rendering Documentation

XLS uses mkdocs to render its documentation, and serves it via GitHub pages on https://google.github.io/xls -- to render documentation locally as a preview, set up mkdocs as follows:

proj/xls$ mkvirtualenv xls-mkdocs-env
proj/xls$ pip install mkdocs-material mdx_truly_sane_lists
proj/xls$ mkdocs serve