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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](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 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 To add builtins, in your .vimrc:
43
44     let g:flake8_builtins="_,apply"
45
46 To ignore errors, in your .vimrc:
47
48     let g:flake8_ignore="E501,W293"
49
50 If you want to change the max line length for PEP8:
51
52     let g:flake8_max_line_length=99
53
54 To set the maximum [McCabe complexity](https://en.wikipedia.org/wiki/Cyclomatic_complexity) before a warning is issued:
55
56     let g:flake8_max_complexity=10
57
58 To customize the location of your flake8 binary, set `g:flake8_cmd`:
59
60     let g:flake8_cmd="/opt/strangebin/flake8000"
61
62 To customize the location of quick fix window, set `g:flake8_quickfix_location`:
63
64     let g:flake8_quickfix_location="topleft"
65
66 To customize whether the quickfix window opens, set `g:flake8_show_quickfix`:
67
68     let g:flake8_show_quickfix=0  " don't show
69     let g:flake8_show_quickfix=1  " show (default)
70
71 To customize whether the show signs in the gutter, set `g:flake8_show_in_gutter`:
72
73     let g:flake8_show_in_gutter=0  " don't show (default)
74     let g:flake8_show_in_gutter=1  " show
75
76 To customize whether the show marks in the file, set `g:flake8_show_in_file`:
77
78     let g:flake8_show_in_file=0  " don't show (default)
79     let g:flake8_show_in_file=1  " show
80
81 To customize the number of marks to show, set `g:flake8_max_markers`:
82
83     let g:flake8_max_markers=500  " (default)
84
85 To customize the gutter markers, set any of `flake8_error_marker`, `flake8_warning_marker`,
86 `flake8_pyflake_marker`, `flake8_complexity_marker`, `flake8_naming_marker`. Setting one to
87 the empty string disables it. Ex.:
88
89     flake8_error_marker='EE'     " set error marker to 'EE'
90     flake8_warning_marker='WW'   " set warning marker to 'WW'
91     flake8_pyflake_marker=''     " disable PyFlakes warnings
92     flake8_complexity_marker=''  " disable McCabe complexity warnings
93     flake8_naming_marker=''      " disable naming warnings
94
95 To customize the colors used for markers, define the highligth groups, `Flake8_Error`,
96 `Flake8_Warning`, `Flake8_PyFlake`, `Flake8_Complexity`, `Flake8_Naming`:
97
98     " to use colors defined in the colorscheme
99     highlight link Flake8_Error      Error
100     highlight link Flake8_Warning    WarningMsg
101     highlight link Flake8_Complexity WarningMsg
102     highlight link Flake8_Naming     WarningMsg
103     highlight link Flake8_PyFlake    WarningMsg
104
105 Tips
106 ----
107 A tip might be to run the Flake8 check every time you write a Python file, to
108 enable this, add the following line to your `.vimrc` file (thanks
109 [Godefroid](http://github.com/gotcha)!):
110
111     autocmd BufWritePost *.py call Flake8()
112
113 This plugin goes well together with the following plugin:
114
115 - [PyUnit](http://github.com/nvie/vim-pyunit) (unit test helper under `<F8>`
116   and `<F9>`)
117
118
119 History
120 -------
121
122 1.4: Added markers and the option to don't show the quickfix window, also split functions into
123 a autoload file. Added:
124
125     - Options:
126       - `g:flake8_show_quickfix`
127       - `g:flake8_show_in_gutter`
128       - `g:flake8_show_in_file`
129       - `g:flake8_max_markers`
130       - `flake8_error_marker`
131       - `flake8_warning_marker`
132       - `flake8_pyflake_marker`
133       - `flake8_complexity_marker`
134       - `flake8_naming_marker`
135     - Functions:
136       - `flake8#Flake8UnplaceMarkers()`
137       - `flake8#Flake8()`
138     - Highlighting:
139       - `Flake8_Error`
140       - `Flake8_Warning`
141       - `Flake8_Complexity`
142       - `Flake8_Naming`
143       - `Flake8_PyFlake`
144
145 1.3: Added the following options:
146
147     - `g:flake8_builtins="_,apply"`
148     - `g:flake8_max_complexity=10`
149
150 1.2: Added the following options:
151
152     - `g:flake8_cmd="/opt/strangebin/flake8000"`
153     - `g:flake8_max_line_length=120`
154     - `g:flake8_ignore="E501,W293"`
155
156 1.1: Added `g:flake8_ignore` option.
157
158 1.0: Initial version.