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Vim Cheat.sh

This is a highly configurable vim plugin to browse cheat sheet from cheat.sh directly from vim.

Demo

There is a demo of most important features of the cheat.sh Vim plugin (5 Min), courtesy of @chubin, CC-SA.

** Note :** In the video, @chubin uses the space key as a <leader>, by default vim <leader> is backslash.

Or, if you want to scroll and/or pause, the same on YouTube:

Features

• Browse existing cheat sheets from cheat.sh directly from vim
• Get answers on any programming question directly on your vim with simple mappings
• Answers depends of your current filetype or framework
• Send compilation / syntax error to cht.sh and get answers
• Manage session id to replay last query from other cht.sh clients
• Quick navigation through answers
• Everything is configurable

How to use it

The easiest way to use this plugin is to use one of the following mappings :

• K get answer on the word under the cursor or the selection on a pager (this feature requires vim >= 7.4.1833, you can check if have the right version with : :echo has("patch-7.4.1833"))
• <leader>KK same as K but works on lines or visual selection (not working on neovim, because they killed interactive commands with :!)
• <leader>KB get the answer on a special buffer
• <leader>KR Replace your question by the answer
• <leader>KP Past the answer below your question
• <leader>KC Replay last query, toggling comments
• <leader>KE Send first error to cht.sh
• <leader>C Toggle showing comments by default see configuration
• <leader>KL Replay last query

The plugins also provides four main commands :

:Cheat
:CheatReplace
:CheatPast
:CheatPager

• These commands takes 0 or 1 argument.
• If you give no argument, it will send the language of the current buffer and the visual selection (or the current line / word in normal mode) as a plus query to cheat.sh and show the answer in a new buffer (:Cheat), in place of your question (:CheatReplace) or in a pager (:CheatPager).
• If one argument is given, you can complete it from a list of available cheat sheets or write your own query.
• They also take a bang that make same transform the query into a plus query: for instance : :Cheat! factory is the same as :Cheat &ft/factory+.

HowIn

The :HowIn command takes exactly one argument.

If the argument is one word, it is interpreted as a filetype (language), and the current line (or word, depending on |cheat.sh-configuration|) is sent as a query for this given language. Else the first word of the query should be a filetype.

Examples :

# Current position in the buffer :
with open('foo') as f:

:HowIn javascript

Or

:Howin javascript open file

Frameworks

Ids

Framework detection can slow down vim openning see #54 so it has been disabled by default.

To enable framework detection you can set the folowwing in your vimrc:

let g:CheatSheetDisableFrameworkDetection=0

When you open a buffer, cheat.sh-vim will try to guess if you are using a framework and if a framework is found, it will send queries using your framework instead of your filetype.

There are also some mappings to change the current framework :

• <leader>Kt : Use filetype instead of framework
• <leader>KT : Use autodetected framework
• <leader>Kf : Use next defined framework for current filetype
• <leader>KF : Use previous defined framework for current filetype

The available Frameworks can be overridden with the following code (adapt to your needs) :

    let g:CheatSheetFrameworks = {
                \ 'python' : ['python', 'django', ],
                \ 'javascript' : ['javascript', 'node', 'angular', 'jquery'],
                \ 'php' : ['php', 'symphony', 'yii', 'zend'],
                \}

As you can see the list is far from being exhaustive, please contribute if you modify it (see below).

Frameworks Detection

This functionality is in early stage and help is wanted to improve it. To detect framework, the plugin go through the list of defined framework for the current filetype. The following dictionary tells the plugin how to detect a few frameworks.

    let g:CheatSheetFrameworkDetectionMethods = {
                    \'django' : { 'type' : 'file', 'value' : 'manage.py' },
                    \'symfony' : { 'type' : 'file', 'value' : 'symfony.phar' },
                    \'jquery' : {'type' :'search', 'value' : 'jquery.*\.js'},
                    \}

This dictionary can be overridden by the user.

There are three types of detections :

1. 'file' : 'value' is an argument for the find command to locate a file find . -name "value"
2. 'search', 'value' is a pattern that should be present in the current file
3. 'func' : 'value' is the name of a user defined function which should return something true if the framework is detected. The function takes one argument which is the name of the framework we are currently testing for.

Please report any contribution on this issue, or do MR (PR) on gitlab (resp github) :

The :CheatId command can be used to manage ids :

:Cheat[!] [newid]         " Generates a new id or set id to newid
                          " Id will not be overwritten if ! is not given
:Cheat remove             " Completely removes the id

Errors

Cheat.sh-vim can directly send the syntax and compilation errors / warning to cht.sh. To do so, hit <leader>KE or run :CheatError.

By default, the answer will be displayed on the cheat buffer, to change this behavior :

let g:CheatSheetDefaultMode = x

Where x is :

• 0 : Cheat buffer (default)
• 1 : Replace current line (sounds like a very bad idea)
• 2 : Use the pager
• 3 : Append answer below current line (sounds like a bad idea)

Error providers

Currently errors are search from the quickfix, then from syntastic errors. To change this order :

let  g:CheatSheetProviders = ['syntastic', 'quickfix']

You can easily add an error provider in 5 steps :

1. Copy the file cheat.sh/autoload/cheat/providers/quickfix.vim to cheat.sh/autoload/cheat/providers/myprovider.vim
2. Adapt and rename the function (only change quickfix in the name), it must return the error string without special chars or an empty string if there are no errors / warning
3. Add your provider name (filename) to the CheatSheatProvider list in cheat.sh/autoload/cheat/providers.vim
4. Test it
5. Do a merge request on gitlab

Syntastic hooks

Cheat.sh-vim uses syntastic hooks to retrieve the error list, if you also need to use syntastic hook, make sure that your function calls ours with the initial error list :

function SyntasticCheckHook(errors)
    call cheat#providers#syntastic#Hook(a:errors)
    " Do whatever you want to do
endfunction

Navigate

Once you have called on of these commands, you can navigate through questions, answers and related with the following mappings :

• <leader>KQN Next Question
• <leader>KAN Next Answer
• <leader>KSN Next "See also"
• <leader>KHN Next in history
• <leader>KQP Previous Question
• <leader>KAP Previous Answer
• <leader>KSP Previous "See also"
• <leader>KHP Previous in history

In the cheat buffer, the following mappings are also available :

• <localleader>h Previous Answer
• <localleader>j Next Question
• <localleader>k Previous Question
• <localleader>l Next Answer
• <localleader>H Previous history
• <localleader>J Next "See also"
• <localleader>K Previous "See also"
• <localleader>L Next history

You can also directly use the function :

:call cheat#navigate(delta, type)

Where delta is a numeric value for moving (1, or -1 for next or previous) And type is one of : 'Q', 'A', 'S', H (history), and C (replay last query, toggling comments).

For instance :

:call cheat#navigate(-3, 'A')

goes back three answers before the current

When navigating, the same mode (pager, buffer, replace) is used as for the last request.

Notes

• <leader> is usually ''.
• This plugin is still in beta, Replace mode might remove some of your code, use with caution.
• For more info on cheat sheet sources, see cheat.sh.

Install

Vizardry

If you have Vizardry installed, you can run from vim:

:Invoke -u dbeniamine cheat.sh-vim

Vundle

Add the following to your Vundle Plugin list (not tested, but should work) :

Plugin 'dbeniamine/cheat.sh-vim'

Pathogen install

git clone https://github.com/dbeniamine/cheat.sh-vim.git ~/.vim/bundle/cheat.sh-vim

Quick install

git clone https://github.com/dbeniamine/cheat.sh-vim.git
cd cheat.sh-vim/
cp -r ./* ~/.vim

Configuration

Every parameter used to retrieve and display the cheat sheet can be changed, to do so, just put the following in you vimrc and adjust to your needs (these are the default values that will be used if you do not change them) :

" Vim command used to open new buffer
let g:CheatSheetReaderCmd='new"'

" Cheat sheet file type
let g:CheatSheetFt='markdown'

" Program used to retrieve cheat sheet with its arguments
let g:CheatSheetUrlGetter='curl --silent'

" Flag to add cookie file to the query
let g:CheatSheetUrlGetterIdFlag='-b'

" cheat sheet base url
let g:CheatSheetBaseUrl='https://cht.sh'

" cheat sheet settings do not include style settings neiter comments,
" see other options below
let g:CheatSheetUrlSettings='q'

" cheat sheet pager
let g:CheatPager='less -R'

" pygmentize theme used for pager output, see :CheatPager :styles-demo
let g:CheatSheetPagerStyle=rrt

" Show comments in answers by default
" (setting this to 0 means giving ?Q to the server)
let g:CheatSheetShowCommentsByDefault=1

" Stay in origin buffer (set to 0 to keep focus on the cheat sheet buffer)
let g:CheatSheetStayInOrigBuf=1

" cheat sheet buffer name
let g:CheatSheetBufferName="_cheat"

" Default selection in normal mode (line for whole line, word for word under cursor)
let g:CheatSheetDefaultSelection="line"

" Default query mode
" 0 => buffer
" 1 => replace (do not use or you might loose some lines of code)
" 2 => pager
" 3 => paste after query
" 4 => paste before query
let g:CheatSheetDefaultMode=0

 Path to cheat sheet cookie
let g:CheatSheetIdPath=expand('~/.cht.sh/id')

" Make plugin silent by  setting bellow variable to 1
let g:CheatSheetSilent=0

You can also disable the mappings (see plugin/cheat.vim to redo the mappings manually)

let g:CheatSheetDoNotMap=1

To disable the replacement of man by cheat sheets :

Let g:CheatDoNotReplaceKeywordPrg=1

License

This plugin is distributed under GPL License v3.0, see https://www.gnu.org/licenses/gpl.txt

The demo are creative Commons, CC-SA Igor Chubin.