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368485e530910e1656fad46d177f4c80127227dd
[etc/vim.git] / plugin / mkd.vim
1 " Heavily based on vim-notes - http://peterodding.com/code/vim/notes/
2 function! s:Markdown_highlight_sources(force)
3     " Syntax highlight source code embedded in notes.
4     " Look for code blocks in the current file
5     let filetypes = {}
6     for line in getline(1, '$')
7         let ft = matchstr(line, '```\zs\w*\>')
8         if !empty(ft) && ft !~ '^\d*$' | let filetypes[ft] = 1 | endif
9     endfor
10     if !exists('b:mkd_known_filetypes')
11         let b:mkd_known_filetypes = {}
12     endif
13     if !a:force && (b:mkd_known_filetypes == filetypes || empty(filetypes))
14         return
15     endif
16
17     " Now we're ready to actually highlight the code blocks.
18     let startgroup = 'mkdCodeStart'
19     let endgroup = 'mkdCodeEnd'
20     for ft in keys(filetypes)
21         if a:force || !has_key(b:mkd_known_filetypes, ft)
22
23             let group = 'mkdSnippet' . toupper(ft)
24             let include = s:syntax_include(ft)
25             let command = 'syntax region %s matchgroup=%s start="^\s*```%s$" matchgroup=%s end="\s*```$" keepend contains=%s%s'
26             execute printf(command, group, startgroup, ft, endgroup, include, has('conceal') ? ' concealends' : '')
27             execute printf('syntax cluster mkdNonListItem add=%s', group)
28
29             let b:mkd_known_filetypes[ft] = 1
30         endif
31     endfor
32 endfunction
33
34 function! s:syntax_include(filetype)
35     " Include the syntax highlighting of another {filetype}.
36     let grouplistname = '@' . toupper(a:filetype)
37     " Unset the name of the current syntax while including the other syntax
38     " because some syntax scripts do nothing when "b:current_syntax" is set
39     if exists('b:current_syntax')
40         let syntax_save = b:current_syntax
41         unlet b:current_syntax
42     endif
43     try
44         execute 'syntax include' grouplistname 'syntax/' . a:filetype . '.vim'
45         execute 'syntax include' grouplistname 'after/syntax/' . a:filetype . '.vim'
46     catch /E484/
47         " Ignore missing scripts
48     endtry
49     " Restore the name of the current syntax
50     if exists('syntax_save')
51         let b:current_syntax = syntax_save
52     elseif exists('b:current_syntax')
53         unlet b:current_syntax
54     endif
55     return grouplistname
56 endfunction
57
58
59 function! s:Markdown_refresh_syntax(force)
60     if &filetype == 'markdown' && line('$') > 1
61         call s:Markdown_highlight_sources(a:force)
62     endif
63 endfunction
64
65 augroup Mkd
66     autocmd!
67     au BufReadPost * call s:Markdown_refresh_syntax(1)
68     au BufWritePost * call s:Markdown_refresh_syntax(0)
69     au InsertEnter,InsertLeave * call s:Markdown_refresh_syntax(0)
70     au CursorHold,CursorHoldI * call s:Markdown_refresh_syntax(0)
71 augroup END