forked from mystiq/hydrogen-web
Merge pull request #669 from vector-im/bwindels/contrib
Add guide for new contributers
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Bruno Windels
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CONTRIBUTING.md
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CONTRIBUTING.md
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Contributing code to hydrogen-web
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==================================
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Everyone is welcome to contribute code to hydrogen-web, provided that they are
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willing to license their contributions under the same license as the project
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itself. We follow a simple 'inbound=outbound' model for contributions: the act
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of submitting an 'inbound' contribution means that the contributor agrees to
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license the code under the same terms as the project's overall 'outbound'
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license - in this case, Apache Software License v2 (see
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[LICENSE](LICENSE)).
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How to contribute
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-----------------
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The preferred and easiest way to contribute changes to the project is to fork
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it on github, and then create a pull request to ask us to pull your changes
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into our repo (https://help.github.com/articles/using-pull-requests/)
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We use GitHub's pull request workflow to review the contribution, and either
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ask you to make any refinements needed or merge it and make them ourselves.
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Things that should go into your PR description:
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* References to any bugs fixed by the change (in GitHub's `Fixes` notation)
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* Describe the why and what is changing in the PR description so it's easy for
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onlookers and reviewers to onboard and context switch.
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* If your PR makes visual changes, include both **before** and **after** screenshots
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to easily compare and discuss what's changing.
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* Include a step-by-step testing strategy so that a reviewer can check out the
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code locally and easily get to the point of testing your change.
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* Add comments to the diff for the reviewer that might help them to understand
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why the change is necessary or how they might better understand and review it.
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We use continuous integration, and all pull requests get automatically tested:
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if your change breaks the build, then the PR will show that there are failed
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checks, so please check back after a few minutes.
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Tests
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-----
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If your PR is a feature then we require that the PR also includes tests.
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These need to test that your feature works as expected and ideally test edge cases too.
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Tests are written as unit tests by exporting a `tests` function from the file to be tested.
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The function returns an object where the key is the test label, and the value is a
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function that accepts an [assert](https://nodejs.org/api/assert.html) object, and return a Promise or nothing.
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Note that there is currently a limitation that files that are not indirectly included from `src/platform/web/main.js` won't be found by the runner.
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You can run the tests by running `yarn test`.
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This uses the [impunity](https://github.com/bwindels/impunity) runner.
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We don't require tests for bug fixes.
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In the future we may formalise this more.
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Code style
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----------
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The js-sdk aims to target TypeScript/ES6. All new files should be written in
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TypeScript and existing files should use ES6 principles where possible.
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Please disable any automatic formatting tools you may have active.
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If present, you'll be asked to undo any unrelated whitespace changes during code review.
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Members should not be exported as a default export in general.
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In general, avoid using `export default`.
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The remaining code-style for hydrogen is [in the process of being documented](codestyle.md), but
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contributors are encouraged to read the
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[code style document for matrix-react-sdk](https://github.com/matrix-org/matrix-react-sdk/blob/master/code_style.md)
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and follow the principles set out there.
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Please ensure your changes match the cosmetic style of the existing project,
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and ***never*** mix cosmetic and functional changes in the same commit, as it
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makes it horribly hard to review otherwise.
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Attribution
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-----------
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If you change or create a file, feel free to add yourself to the copyright holders
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in the license header of that file.
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Sign off
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--------
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In order to have a concrete record that your contribution is intentional
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and you agree to license it under the same terms as the project's license, we've
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adopted the same lightweight approach that the Linux Kernel
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(https://www.kernel.org/doc/Documentation/SubmittingPatches), Docker
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(https://github.com/docker/docker/blob/master/CONTRIBUTING.md), and many other
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projects use: the DCO (Developer Certificate of Origin:
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http://developercertificate.org/). This is a simple declaration that you wrote
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the contribution or otherwise have the right to contribute it to Matrix:
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```
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Developer Certificate of Origin
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Version 1.1
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Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
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660 York Street, Suite 102,
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San Francisco, CA 94110 USA
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Everyone is permitted to copy and distribute verbatim copies of this
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license document, but changing it is not allowed.
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Developer's Certificate of Origin 1.1
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By making a contribution to this project, I certify that:
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(a) The contribution was created in whole or in part by me and I
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have the right to submit it under the open source license
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indicated in the file; or
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(b) The contribution is based upon previous work that, to the best
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of my knowledge, is covered under an appropriate open source
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license and I have the right under that license to submit that
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work with modifications, whether created in whole or in part
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by me, under the same open source license (unless I am
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permitted to submit under a different license), as indicated
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in the file; or
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(c) The contribution was provided directly to me by some other
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person who certified (a), (b) or (c) and I have not modified
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it.
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(d) I understand and agree that this project and the contribution
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are public and that a record of the contribution (including all
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personal information I submit with it, including my sign-off) is
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maintained indefinitely and may be redistributed consistent with
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this project or the open source license(s) involved.
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```
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If you agree to this for your contribution, then all that's needed is to
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include the line in your commit or pull request comment:
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```
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Signed-off-by: Your Name <your@email.example.org>
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```
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We accept contributions under a legally identifiable name, such as your name on
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government documentation or common-law names (names claimed by legitimate usage
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or repute). Unfortunately, we cannot accept anonymous contributions at this
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time.
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Git allows you to add this signoff automatically when using the `-s` flag to
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`git commit`, which uses the name and email set in your `user.name` and
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`user.email` git configs.
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If you forgot to sign off your commits before making your pull request and are
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on Git 2.17+ you can mass signoff using rebase:
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```
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git rebase --signoff origin/develop
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```
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