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Fixed examples in README
[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
16 Make sure you've installed the
17 [flake8](https://pypi.python.org/pypi/flake8/) package.
18
19 If you use vim >= 8, install this plugin with:
20 ```
21 mkdir -p ~/.vim/pack/flake8/start/
22 cd ~/.vim/pack/flake8/start/
23 git clone https://github.com/nvie/vim-flake8.git
24 ```
25
26 Otherwise, install [vim-pathogen](https://github.com/tpope/vim-pathogen)
27 if you're not using it already. Then, simply put the
28 contents of this repository in your `~/.vim/bundle` directory.
29
30 Usage
31 -----
32 1. Open a Python file
33 2. Press `<F7>` to run `flake8` on it
34
35 It shows the errors inside a quickfix window, which will allow your to quickly
36 jump to the error locations by simply pressing [Enter].
37
38 If any of `g:flake8_show_in_gutter` or `g:flake8_show_in_file` are set to `1`, call:
39
40     call flake8#Flake8UnplaceMarkers()
41
42 To remove all markers. No default mapping is provided.
43
44 Customization
45 -------------
46 If you don't want to use the `<F7>` key for flake8-checking, simply remap it to
47 another key.  It autodetects whether it has been remapped and won't register
48 the `<F7>` key if so.  For example, to remap it to `<F3>` instead, use:
49
50     autocmd FileType python map <buffer> <F3> :call flake8#Flake8()<CR>
51
52 For flake8 configuration options please consult the following page:
53
54 http://flake8.pycqa.org/en/latest/user/configuration.html
55
56 To customize the location of your flake8 binary, set `g:flake8_cmd`:
57
58     let g:flake8_cmd="/opt/strangebin/flake8000"
59
60 To customize the location of quick fix window, set `g:flake8_quickfix_location`:
61
62     let g:flake8_quickfix_location="topleft"
63
64 To customize the height of quick fix window, set `g:flake8_quickfix_height`:
65
66     let g:flake8_quickfix_height=7
67
68 To customize whether the quickfix window opens, set `g:flake8_show_quickfix`:
69
70     let g:flake8_show_quickfix=0  " don't show
71     let g:flake8_show_quickfix=1  " show (default)
72
73 To customize whether the show signs in the gutter, set `g:flake8_show_in_gutter`:
74
75     let g:flake8_show_in_gutter=0  " don't show (default)
76     let g:flake8_show_in_gutter=1  " show
77
78 To customize whether the show marks in the file, set `g:flake8_show_in_file`:
79
80     let g:flake8_show_in_file=0  " don't show (default)
81     let g:flake8_show_in_file=1  " show
82
83 To customize the number of marks to show, set `g:flake8_max_markers`:
84
85     let g:flake8_max_markers=500  " (default)
86
87 To customize the gutter markers, set any of `flake8_error_marker`, `flake8_warning_marker`,
88 `flake8_pyflake_marker`, `flake8_complexity_marker`, `flake8_naming_marker`. Setting one to
89 the empty string disables it. Ex.:
90
91     flake8_error_marker='EE'     " set error marker to 'EE'
92     flake8_warning_marker='WW'   " set warning marker to 'WW'
93     flake8_pyflake_marker=''     " disable PyFlakes warnings
94     flake8_complexity_marker=''  " disable McCabe complexity warnings
95     flake8_naming_marker=''      " disable naming warnings
96
97 To customize the colors used for markers, define the highlight groups, `Flake8_Error`,
98 `Flake8_Warning`, `Flake8_PyFlake`, `Flake8_Complexity`, `Flake8_Naming`:
99
100     " to use colors defined in the colorscheme
101     highlight link Flake8_Error      Error
102     highlight link Flake8_Warning    WarningMsg
103     highlight link Flake8_Complexity WarningMsg
104     highlight link Flake8_Naming     WarningMsg
105     highlight link Flake8_PyFlake    WarningMsg
106
107 Tips
108 ----
109 A tip might be to run the Flake8 check every time you write a Python file, to
110 enable this, add the following line to your `.vimrc` file (thanks
111 [Godefroid](https://github.com/gotcha)!):
112
113     autocmd BufWritePost *.py call flake8#Flake8()
114
115 This plugin goes well together with the following plugin:
116
117 - [PyUnit](https://github.com/nvie/vim-pyunit) (unit test helper under `<F8>`
118   and `<F9>`)
119
120
121 Max line lengths
122 ----------------
123
124 One particular customization a lot of people like to make is relaxing the
125 maximum line length default.  This is a config setting that should be set in
126 flake8 itself. (vim-flake8 "just" invokes it and deals with showing the output
127 in Vim's quickfix window.)
128
129 To do so, put the following into your `~/.config/flake8` file:
130
131     [flake8]
132     max-line-length = 120
133
134
135 History
136 -------
137 1.6: Deprecated configuring flake8 options through Vim settings.  Instead,
138 advise users to use the `~/.config/flake8` config file.
139
140     - Decprecated options:
141       - `g:flake8_builtins`
142       - `g:flake8_ignore`
143       - `g:flake8_max_line_length`
144       - `g:flake8_max_complexity`
145
146     - New options:
147       - `g:flake8_quickfix_height`
148
149 1.5: Added markers and the option to don't show the quickfix window, also split
150 functions into a autoload file. Added:
151
152     - Options:
153       - `g:flake8_show_quickfix`
154       - `g:flake8_show_in_gutter`
155       - `g:flake8_show_in_file`
156       - `g:flake8_max_markers`
157       - `flake8_error_marker`
158       - `flake8_warning_marker`
159       - `flake8_pyflake_marker`
160       - `flake8_complexity_marker`
161       - `flake8_naming_marker`
162     - Functions:
163       - `flake8#Flake8UnplaceMarkers()`
164       - `flake8#Flake8()`
165     - Highlighting:
166       - `Flake8_Error`
167       - `Flake8_Warning`
168       - `Flake8_Complexity`
169       - `Flake8_Naming`
170       - `Flake8_PyFlake`
171
172 1.4: Suppress output to stdout.
173
174 1.3: Added the following options:
175
176     - `g:flake8_builtins="_,apply"`
177     - `g:flake8_max_complexity=10`
178
179 1.2: Added the following options:
180
181     - `g:flake8_cmd="/opt/strangebin/flake8000"`
182     - `g:flake8_max_line_length=120`
183     - `g:flake8_ignore="E501,W293"`
184
185 1.1: Added `g:flake8_ignore` option.
186
187 1.0: Initial version.
188
189
190 License
191 -------
192
193 Liberally licensed under BSD terms.