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# Contributing to Uncrustify
## How to contribute
There are lots of ways to contribute to Uncrustify:
- Report Issues
- Propose Features or Improvements
- Submit Pull Requests
## Making changes
* Pull latest [master][master] and create a new branch:
- Branch name _should_ use lowercase, using `-` to separate words
and not `_`. Other special characters _should_ be avoided.
(However, feel free to use option names verbatim in branch names;
`_` _should_ be used when part of an option name.)
- A hierarchical structure _may_ be designated using `/`
(e.g. `area/topic`), although this is uncommon.
The last part of the name can be keywords like `bugfix`, `feature`,
`optim`, `docs`, `refactor`, `test`, etc.
- Branches _should_ be named after _what_ the change is about.
- Branches _should not_ be named after the issue number,
developer name, etc.
* Organize your work:
- Specialize your branch to target only one thing.
Split your work in multiple branches if necessary.
- Make commits of logical units.
- Avoid "fix-up" commits.
Instead, rewrite your history so that the original commit is "clean".
- Try to write a [quality commit message][commits]:
+ Separate subject line from body with a blank line.
+ Limit subject line to 50 characters.
+ Capitalize the subject line.
+ Do not end the subject line with a period.
+ Use imperative present tense in the subject line.
A proper subject can complete the sentence
"If applied, this commit will, [subject]".
+ Wrap the body at 72 characters.
+ Include motivation for the change
and contrast its implementation with previous behavior.
Explain the _what_ and _why_ instead of _how_.
- If the git diff command, or the diff part of the git gui,
don't produce accurate output, it might be necessary to add
some lines to the ~/.gitconfig file:
[diff]
algorithm = patience
[gui]
diffopts = --patience
* Add or update unit tests:
- All behavioral changes should come with a unit test that verifies
that the new feature or fixed issue works as expected.
- Consider improving existing tests if it makes sense to do so.
- Any unused test number may be used,
however it is preferred to keep related tests together, if possible.
- Read [Writing Tests][tests] for more details.
* Polish your work:
- The code should be clean, with documentation where needed.
- The change must be complete (no upcoming fix-up commits).
- Functional changes should always be accompanied by tests (see above).
Changes without tests should explain why tests are not present.
(Changes that are non-functional, such as documentation changes,
can usually omit tests without justification.)
* Prepare a Pull Request (PR):
- To reduce the likelihood of conflicts and test failures,
consider rebasing your work on top of latest master before creating a PR.
- Verify that your code is working properly
by running `ctest` in your build directory.
(Changes that fail CI will _not_ be merged.
Running the tests locally will help to avoid this.)
You can change the level of logging by changing the line 104 and 109
of the file tests/test_uncrustify/test.py to another value.
- The PR title should represent _what_ is being changed
(a rephrasing of the branch name if set correctly).
- The PR description should document the _why_ the change needed to be done
and not _how_, which should be obvious by doing the code review.
- After commiting a new PR, one may have a look to the results:
https://coveralls.io/github/uncrustify/uncrustify
[master]: https://github.com/uncrustify/uncrustify/tree/master
[commits]: https://chris.beams.io/posts/git-commit/
[tests]: https://github.com/uncrustify/uncrustify/wiki/Writing-Tests