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139 lines
6.5 KiB
Markdown
139 lines
6.5 KiB
Markdown
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# How to Contribute to Abseil
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We'd love to accept your patches and contributions to this project. There are
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just a few small guidelines you need to follow.
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NOTE: If you are new to GitHub, please start by reading [Pull Request
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howto](https://help.github.com/articles/about-pull-requests/)
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## Contributor License Agreement
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Contributions to this project must be accompanied by a Contributor License
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Agreement. You (or your employer) retain the copyright to your contribution,
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this simply gives us permission to use and redistribute your contributions as
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part of the project. Head over to <https://cla.developers.google.com/> to see
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your current agreements on file or to sign a new one.
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You generally only need to submit a CLA once, so if you've already submitted one
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(even if it was for a different project), you probably don't need to do it
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again.
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## Contribution Guidelines
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Potential contributors sometimes ask us if the Abseil project is the appropriate
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home for their utility library code or for specific functions implementing
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missing portions of the standard. Often, the answer to this question is "no".
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We’d like to articulate our thinking on this issue so that our choices can be
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understood by everyone and so that contributors can have a better intuition
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about whether Abseil might be interested in adopting a new library.
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### Priorities
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Although our mission is to augment the C++ standard library, our goal is not to
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provide a full forward-compatible implementation of the latest standard. For us
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to consider a library for inclusion in Abseil, it is not enough that a library
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is useful. We generally choose to release a library when it meets at least one
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of the following criteria:
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* **Widespread usage** - Using our internal codebase to help gauge usage, most
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of the libraries we've released have tens of thousands of users.
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* **Anticipated widespread usage** - Pre-adoption of some standard-compliant
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APIs may not have broad adoption initially but can be expected to pick up
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usage when it replaces legacy APIs. `absl::from_chars`, for example,
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replaces existing code that converts strings to numbers and will therefore
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likely see usage growth.
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* **High impact** - APIs that provide a key solution to a specific problem,
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such as `absl::FixedArray`, have higher impact than usage numbers may signal
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and are released because of their importance.
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* **Direct support for a library that falls under one of the above** - When we
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want access to a smaller library as an implementation detail for a
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higher-priority library we plan to release, we may release it, as we did
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with portions of `absl/meta/type_traits.h`. One consequence of this is that
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the presence of a library in Abseil does not necessarily mean that other
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similar libraries would be a high priority.
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### API Freeze Consequences
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Via the
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[Abseil Compatibility Guidelines](https://abseil.io/about/compatibility), we
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have promised a large degree of API stability. In particular, we will not make
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backward-incompatible changes to released APIs without also shipping a tool or
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process that can upgrade our users' code. We are not yet at the point of easily
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releasing such tools. Therefore, at this time, shipping a library establishes an
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API contract which is borderline unchangeable. (We can add new functionality,
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but we cannot easily change existing behavior.) This constraint forces us to
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very carefully review all APIs that we ship.
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## Coding Style
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To keep the source consistent, readable, diffable and easy to merge, we use a
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fairly rigid coding style, as defined by the
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[google-styleguide](https://github.com/google/styleguide) project. All patches
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will be expected to conform to the style outlined
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[here](https://google.github.io/styleguide/cppguide.html).
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## Guidelines for Pull Requests
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* If you are a Googler, it is preferable to first create an internal CL and
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have it reviewed and submitted. The code propagation process will deliver
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the change to GitHub.
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* Create **small PRs** that are narrowly focused on **addressing a single
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concern**. We often receive PRs that are trying to fix several things at a
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time, but if only one fix is considered acceptable, nothing gets merged and
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both author's & review's time is wasted. Create more PRs to address
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different concerns and everyone will be happy.
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* For speculative changes, consider opening an [Abseil
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issue](https://github.com/abseil/abseil-cpp/issues) and discussing it first.
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If you are suggesting a behavioral or API change, consider starting with an
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[Abseil proposal template](ABSEIL_ISSUE_TEMPLATE.md).
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* Provide a good **PR description** as a record of **what** change is being
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made and **why** it was made. Link to a GitHub issue if it exists.
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* Don't fix code style and formatting unless you are already changing that
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line to address an issue. Formatting of modified lines may be done using
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`git clang-format`. PRs with irrelevant changes won't be merged. If
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you do want to fix formatting or style, do that in a separate PR.
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* Unless your PR is trivial, you should expect there will be reviewer comments
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that you'll need to address before merging. We expect you to be reasonably
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responsive to those comments, otherwise the PR will be closed after 2-3
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weeks of inactivity.
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* Maintain **clean commit history** and use **meaningful commit messages**.
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PRs with messy commit history are difficult to review and won't be merged.
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Use `rebase -i upstream/master` to curate your commit history and/or to
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bring in latest changes from master (but avoid rebasing in the middle of a
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code review).
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* Keep your PR up to date with upstream/master (if there are merge conflicts,
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we can't really merge your change).
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* **All tests need to be passing** before your change can be merged. We
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recommend you **run tests locally** (see below)
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* Exceptions to the rules can be made if there's a compelling reason for doing
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so. That is - the rules are here to serve us, not the other way around, and
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the rules need to be serving their intended purpose to be valuable.
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* All submissions, including submissions by project members, require review.
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## Running Tests
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Use "bazel test <>" functionality to run the unit tests.
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Prerequisites for building and running tests are listed in
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[README.md](README.md)
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## Abseil Committers
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The current members of the Abseil engineering team are the only committers at
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present.
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## Release Process
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Abseil lives at head, where latest-and-greatest code can be found.
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