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Automatic detection of deprecated Python 2 forms of print and exec
[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 [README](README.md) yet?
5
6
7 ## Bird's eye view
8
9 In terms of inspiration, *Black* is about as configurable as *gofmt* and
10 *rustfmt* are.  This is deliberate.
11
12 Bug reports and fixes are always welcome!  Please follow the issue
13 template for best results.
14
15 Before you suggest a new feature or configuration knob, ask yourself why
16 you want it.  If it enables better integration with some workflow, fixes
17 an inconsistency, speeds things up, and so on - go for it!  On the other
18 hand, if your answer is "because I don't like a particular formatting"
19 then you're not ready to embrace *Black* yet. Such changes are unlikely
20 to get accepted. You can still try but prepare to be disappointed.
21
22
23 ## Technicalities
24
25 Development on the latest version of Python is preferred.  As of this
26 writing it's 3.6.4.  You can use any operating system.  I am using macOS
27 myself and CentOS at work.
28
29 Install all development dependencies using:
30 ```
31 $ pipenv install --dev
32 ```
33 If you haven't used `pipenv` before but are comfortable with virtualenvs,
34 just run `pip install pipenv` in the virtualenv you're already using and
35 invoke the command above from the cloned Black repo. It will do the
36 correct thing.
37
38 Before submitting pull requests, run tests with:
39 ```
40 $ python setup.py test
41 ```
42
43 Also run mypy and flake8 on `black.py` and `test_black.py`.  Travis will
44 run all that for you but if you left any errors here, it will be quicker
45 and less embarrassing to fix them locally ;-)
46
47
48 ## Hygiene
49
50 If you're fixing a bug, add a test.  Run it first to confirm it fails,
51 then fix the bug, run it again to confirm it's really fixed.
52
53 If adding a new feature, add a test.  In fact, always add a test.  But
54 wait, before adding any large feature, first open an issue for us to
55 discuss the idea first.
56
57
58 ## Finally
59
60 Thanks again for your interest in improving the project!  You're taking
61 action when most people decide to sit and watch.