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[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](https://pypi.python.org/pypi/flake8/) is a wrapper around PyFlakes
9 (static syntax checker), PEP8 (style checker) and Ned's MacCabe script
10 (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
17 [flake8](https://pypi.python.org/pypi/flake8/) package.  Then, simply put the
18 contents of this repository in your `~/.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 If any of `g:flake8_show_in_gutter` or `g:flake8_show_in_file` are set to `1`, call:
29
30     call flake8#Flake8UnplaceMarkers()
31
32 To remove all markers. No default mapping is provided.
33
34 Customization
35 -------------
36 If you don't want to use the `<F7>` key for flake8-checking, simply remap it to
37 another key.  It autodetects whether it has been remapped and won't register
38 the `<F7>` key if so.  For example, to remap it to `<F3>` instead, use:
39
40     autocmd FileType python map <buffer> <F3> :call Flake8()<CR>
41
42 For flake8 configuration options please consult the following page:
43
44 https://flake8.readthedocs.org/en/latest/config.html
45
46 To customize the location of your flake8 binary, set `g:flake8_cmd`:
47
48     let g:flake8_cmd="/opt/strangebin/flake8000"
49
50 To customize the location of quick fix window, set `g:flake8_quickfix_location`:
51
52     let g:flake8_quickfix_location="topleft"
53
54 To customize whether the quickfix window opens, set `g:flake8_show_quickfix`:
55
56     let g:flake8_show_quickfix=0  " don't show
57     let g:flake8_show_quickfix=1  " show (default)
58
59 To customize whether the show signs in the gutter, set `g:flake8_show_in_gutter`:
60
61     let g:flake8_show_in_gutter=0  " don't show (default)
62     let g:flake8_show_in_gutter=1  " show
63
64 To customize whether the show marks in the file, set `g:flake8_show_in_file`:
65
66     let g:flake8_show_in_file=0  " don't show (default)
67     let g:flake8_show_in_file=1  " show
68
69 To customize the number of marks to show, set `g:flake8_max_markers`:
70
71     let g:flake8_max_markers=500  " (default)
72
73 To customize the gutter markers, set any of `flake8_error_marker`, `flake8_warning_marker`,
74 `flake8_pyflake_marker`, `flake8_complexity_marker`, `flake8_naming_marker`. Setting one to
75 the empty string disables it. Ex.:
76
77     flake8_error_marker='EE'     " set error marker to 'EE'
78     flake8_warning_marker='WW'   " set warning marker to 'WW'
79     flake8_pyflake_marker=''     " disable PyFlakes warnings
80     flake8_complexity_marker=''  " disable McCabe complexity warnings
81     flake8_naming_marker=''      " disable naming warnings
82
83 To customize the colors used for markers, define the highlight groups, `Flake8_Error`,
84 `Flake8_Warning`, `Flake8_PyFlake`, `Flake8_Complexity`, `Flake8_Naming`:
85
86     " to use colors defined in the colorscheme
87     highlight link Flake8_Error      Error
88     highlight link Flake8_Warning    WarningMsg
89     highlight link Flake8_Complexity WarningMsg
90     highlight link Flake8_Naming     WarningMsg
91     highlight link Flake8_PyFlake    WarningMsg
92
93 Tips
94 ----
95 A tip might be to run the Flake8 check every time you write a Python file, to
96 enable this, add the following line to your `.vimrc` file (thanks
97 [Godefroid](https://github.com/gotcha)!):
98
99     autocmd BufWritePost *.py call Flake8()
100
101 This plugin goes well together with the following plugin:
102
103 - [PyUnit](https://github.com/nvie/vim-pyunit) (unit test helper under `<F8>`
104   and `<F9>`)
105
106
107 History
108 -------
109
110 1.5: Added markers and the option to don't show the quickfix window, also split functions into
111 a autoload file. Added:
112
113     - Options:
114       - `g:flake8_show_quickfix`
115       - `g:flake8_show_in_gutter`
116       - `g:flake8_show_in_file`
117       - `g:flake8_max_markers`
118       - `flake8_error_marker`
119       - `flake8_warning_marker`
120       - `flake8_pyflake_marker`
121       - `flake8_complexity_marker`
122       - `flake8_naming_marker`
123     - Functions:
124       - `flake8#Flake8UnplaceMarkers()`
125       - `flake8#Flake8()`
126     - Highlighting:
127       - `Flake8_Error`
128       - `Flake8_Warning`
129       - `Flake8_Complexity`
130       - `Flake8_Naming`
131       - `Flake8_PyFlake`
132
133 1.4: Suppress output to stdout.
134
135 1.3: Added the following options:
136
137     - `g:flake8_builtins="_,apply"`
138     - `g:flake8_max_complexity=10`
139
140 1.2: Added the following options:
141
142     - `g:flake8_cmd="/opt/strangebin/flake8000"`
143     - `g:flake8_max_line_length=120`
144     - `g:flake8_ignore="E501,W293"`
145
146 1.1: Added `g:flake8_ignore` option.
147
148 1.0: Initial version.
149
150
151 License
152 -------
153
154 Liberally licensed under BSD terms.