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Add `black -c "code"` (#761)
[etc/vim.git] / CONTRIBUTING.md
1 # Contributing to *Black*
2
3 Welcome! Happy to see you willing to make the project better. Have you
4 read the entire [user documentation](https://black.readthedocs.io/en/latest/)
5 yet?
6
7
8 ## Bird's eye view
9
10 In terms of inspiration, *Black* is about as configurable as *gofmt*.
11 This is deliberate.
12
13 Bug reports and fixes are always welcome!  Please follow the [issue
14 template on GitHub](https://github.com/python/black/issues/new) for best 
15 results.
16
17 Before you suggest a new feature or configuration knob, ask yourself why
18 you want it.  If it enables better integration with some workflow, fixes
19 an inconsistency, speeds things up, and so on - go for it!  On the other
20 hand, if your answer is "because I don't like a particular formatting"
21 then you're not ready to embrace *Black* yet. Such changes are unlikely
22 to get accepted. You can still try but prepare to be disappointed.
23
24
25 ## Technicalities
26
27 Development on the latest version of Python is preferred.  As of this
28 writing it's 3.6.5.  You can use any operating system.  I am using macOS
29 myself and CentOS at work.
30
31 Install all development dependencies using:
32 ```
33 $ pipenv install --dev
34 $ pre-commit install
35 ```
36 If you haven't used `pipenv` before but are comfortable with virtualenvs,
37 just run `pip install pipenv` in the virtualenv you're already using and
38 invoke the command above from the cloned *Black* repo. It will do the
39 correct thing.
40
41 Before submitting pull requests, run tests with:
42 ```
43 $ python setup.py test
44 ```
45
46
47 ## Hygiene
48
49 If you're fixing a bug, add a test.  Run it first to confirm it fails,
50 then fix the bug, run it again to confirm it's really fixed.
51
52 If adding a new feature, add a test.  In fact, always add a test.  But
53 wait, before adding any large feature, first open an issue for us to
54 discuss the idea first.
55
56
57 ## Finally
58
59 Thanks again for your interest in improving the project!  You're taking
60 action when most people decide to sit and watch.