Docs: update the commit message format to a modified version of the AngularJS commit message style
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# Commit message style
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*This specification is heavily inspired by the [AngularJS commit message format][https://github.com/angular/angular/blob/main/CONTRIBUTING.md#-commit-message-format].*
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Commit messages have to align with the following style:
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We have very precise rules over how our Git commit messages must be formatted.
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This format leads to **easier to read commit history**.
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`<type> (<space>): <change>`
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Each commit message consists of a **header**, a **body** (optional), and a **footer** (optional).
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Pull requests that don't align with this style probably won't be accepted.
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## type
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The type of change to be committed.
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```
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<header>
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<BLANK LINE>
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<body>
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<BLANK LINE>
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<footer>
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```
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Possible values:
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- __feature__ - When you added a new feature or functionality.
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- __fix__ - When you fixed a bug or stuff like that.
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- __docs__ - When you wrote documentation or changed the readme. The space field is optional here.
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- __refactor__ - When you restructured the codebase / parts of it. The space field is optional here.
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The `header` is mandatory and must conform to the _Commit Message Header format_ (described below).
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If your commit has multiple types, think about splitting it into multiple commits.
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This helps others (and you) to understand changes in retrospect.
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The `body` is mandatory for all commits that are not 100% self explainatory.
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When the body is present it must be at least 20 characters long and must conform to the _Commit Message Body format_.
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## space
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The space that is affected by the commit.
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The `footer` is optional. The _Commit Message Footer format_ (described below) describes what the footer is used for and the structure it must have.
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## change
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What you've changed. / The actual commit message.
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# Examples
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- `feature (AHCI): implemented port initialization`
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- `fix (processes): changed process spawning to copy the null terminator at the end of the name`
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## Commit Message Header
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```
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<type>(<scope>): <short summary>
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│ │ │
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│ │ └─⫸ Summary in present tense. Not capitalized. No period at the end.
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│ │
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│ └─⫸ Commit Scope: The name of the affected module.
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│
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└─⫸ Commit Type: Build|Docs|Feat|Fix|Perf|Refactor|Test|Merge
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```
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The `<type>` and `<summary>` fields are mandatory, the `(<scope>)` field is optional.
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### type
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Must be one of the following:
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* **Build**: Changes that affect the build system or external dependencies (example scopes: gulp, broccoli, npm)
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* **Docs**: Documentation only changes
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* **Feat**: A new feature
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* **Fix**: A bug fix
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* **Perf**: A code change that improves performance
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* **Refactor**: A code change that neither fixes a bug nor adds a feature
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* **Test**: Adding missing tests or correcting existing tests
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* **Merge**: A merging commit
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### Scope
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The scope should be the name of the module affected (as perceived by the person reading the changelog generated from commit messages).
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Specify submodules if needed!
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Example scopes:
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* `app::events`
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* `ui`
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When a commit affects the whole tree, use `treewide`.
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### Summary
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Use the summary field to provide a succinct description of the change:
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* use the imperative, present tense: "change" not "changed" nor "changes"
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* don't capitalize the first letter
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* no dot (.) at the end
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## Commit Message Body
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Just as in the summary, use the imperative, present tense: "fix" not "fixed" nor "fixes".
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Explain the motivation for the change in the commit message body. This commit message should explain _why_ you are making the change.
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You can include a comparison of the previous behavior with the new behavior in order to illustrate the impact of the change.
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This is not needed, if the summary is 100% self-explainatory.
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## Commit Message Footer
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The footer can contain information about breaking changes and deprecations and is also the place to reference issues and other PRs that this commit closes or is related to.
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For example:
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```
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BREAKING CHANGE: <breaking change summary>
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<BLANK LINE>
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<breaking change description + migration instructions>
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<BLANK LINE>
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<BLANK LINE>
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Fixes #<issue number>
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```
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or
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```
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DEPRECATED: <what is deprecated>
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<BLANK LINE>
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<deprecation description + recommended update path>
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<BLANK LINE>
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<BLANK LINE>
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Closes #<pr number>
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```
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Breaking Change section should start with the phrase "BREAKING CHANGE: " followed by a summary of the breaking change, a blank line, and a detailed description of the breaking change that also includes migration instructions.
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Similarly, a Deprecation section should start with "DEPRECATED: " followed by a short description of what is deprecated, a blank line, and a detailed description of the deprecation that also mentions the recommended update path.
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