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Syntax highlighting of code blocks
[etc/vim.git] / plugin / mkd.vim
1 " Completely stolen from 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, '$')
7         let ft = matchstr(line, '```\zs\w\+\>')
8         if ft !~ '^\d*$' | let filetypes[ft] = 1 | endif
9     endfor
10     " Don't refresh the highlighting if nothing has changed.
11     if !a:force && exists('b:mkd_previous_sources') && b:mkd_previous_sources == filetypes
12         return
13     else
14         let b:mkd_previous_sources = filetypes
15     endif
16     " Now we're ready to actually highlight the code blocks.
17     if !empty(filetypes)
18         let startgroup = 'mkdCodeStart'
19         let endgroup = 'mkdCodeEnd'
20         for ft in keys(filetypes)
21             let group = 'mkdSnippet' . toupper(ft)
22             let include = s:syntax_include(ft)
23             let command = 'syntax region %s matchgroup=%s start="^```%s$" matchgroup=%s end="^```$" keepend contains=%s%s'
24             execute printf(command, group, startgroup, ft, endgroup, include, has('conceal') ? ' concealends' : '')
25             execute printf('syntax cluster mkdNonListItem add=%s', group)
26         endfor
27     endif
28 endfunction
29
30 function! s:syntax_include(filetype)
31     " Include the syntax highlighting of another {filetype}.
32     let grouplistname = '@' . toupper(a:filetype)
33     " Unset the name of the current syntax while including the other syntax
34     " because some syntax scripts do nothing when "b:current_syntax" is set
35     if exists('b:current_syntax')
36         let syntax_save = b:current_syntax
37         unlet b:current_syntax
38     endif
39     try
40         execute 'syntax include' grouplistname 'syntax/' . a:filetype . '.vim'
41         execute 'syntax include' grouplistname 'after/syntax/' . a:filetype . '.vim'
42     catch /E484/
43         " Ignore missing scripts
44     endtry
45     " Restore the name of the current syntax
46     if exists('syntax_save')
47         let b:current_syntax = syntax_save
48     elseif exists('b:current_syntax')
49         unlet b:current_syntax
50     endif
51     return grouplistname
52 endfunction
53
54
55 function! s:Markdown_refresh_syntax()
56     if &filetype == 'mkd' && line('$') > 1
57         call s:Markdown_highlight_sources(0)
58     endif
59 endfunction
60
61 augroup Mkd
62     autocmd!
63     au BufReadPost * call s:Markdown_refresh_syntax()
64     au BufReadPost,BufWritePost * call s:Markdown_refresh_syntax()
65     au InsertEnter,InsertLeave * call s:Markdown_refresh_syntax()
66     au CursorHold,CursorHoldI * call s:Markdown_refresh_syntax()
67 augroup END
68