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f84055baa03b30179628af15d0a53d88cb10bea8
[etc/vim.git] / README.mdown
1 vim-flake8
2 ==========
3 `vim-flake8` is a Vim plugin that runs the currently open file through Flake8,
4 a static syntax and style checker for Python source code.  It supersedes both
5 [vim-pyflakes](https://github.com/nvie/vim-pyflakes) and
6 [vim-pep8](https://github.com/nvie/vim-pep8).
7
8 [Flake8](http://pypi.python.org/pypi/flake8/) is a wrapper around PyFlakes 
9 (static syntax checker), PEP8 (style checker) 
10 and Ned's MacCabe script (complexity checker).
11
12
13 Installation
14 ------------
15 Use [vim-pathogen](https://github.com/tpope/vim-pathogen) if you're not using
16 it already.  Make sure you've installed the [flake8](http://pypi.python.org/pypi/flake8/) package.
17 Then, simply put the contents of this repository in your
18 `~/.vim/bundle` directory.
19
20 Usage
21 -----
22 1. Open a Python file
23 2. Press `<F7>` to run `flake8` on it
24
25 It shows the errors inside a quickfix window, which will allow your to quickly
26 jump to the error locations by simply pressing [Enter].
27
28
29 Customization
30 -------------
31 If you don't want to use the `<F7>` key for flake8-checking, simply remap it to
32 another key.  It autodetects whether it has been remapped and won't register
33 the `<F7>` key if so.  For example, to remap it to `<F3>` instead, use:
34
35     autocmd FileType python map <buffer> <F3> :call Flake8()<CR>
36
37 To add builtins, in your .vimrc:
38
39     let g:flake8_builtins="_,apply"
40
41 To ignore errors, in your .vimrc:
42
43     let g:flake8_ignore="E501,W293"
44
45 If you want to change the max line length for PEP8:
46
47     let g:flake8_max_line_length=99
48
49 To set the maximum [McCabe complexity](https://en.wikipedia.org/wiki/Cyclomatic_complexity) before a warning is issued:
50
51     let g:flake8_max_complexity=10
52
53 To customize the location of your flake8 binary, set `g:flake8_cmd`:
54
55     let g:flake8_cmd="/opt/strangebin/flake8000"
56
57
58 Tips
59 ----
60 A tip might be to run the Flake8 check every time you write a Python file, to
61 enable this, add the following line to your `.vimrc` file (thanks
62 [Godefroid](http://github.com/gotcha)!):
63
64     autocmd BufWritePost *.py call Flake8()
65
66 This plugin goes well together with the following plugin:
67
68 - [PyUnit](http://github.com/nvie/vim-pyunit) (unit test helper under `<F8>`
69   and `<F9>`)
70
71
72 History
73 -------
74
75 1.3: Added the following options:
76
77      - `g:flake8_builtins="_,apply"`
78      - `g:flake8_max_complexity=10`
79
80 1.2: Added the following options:
81
82      - `g:flake8_cmd="/opt/strangebin/flake8000"`
83      - `g:flake8_max_line_length=120`
84      - `g:flake8_ignore="E501,W293"`
85
86 1.1: Added `g:flake8_ignore` option.
87
88 1.0: Initial version.