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94267eedb315b88c1f165763717a383db853136d
[etc/vim.git] / after / ftplugin / markdown.vim
1 " folding for Markdown headers, both styles (atx- and setex-)
2 " http://daringfireball.net/projects/markdown/syntax#header
3 "
4 " this code can be placed in file
5 "   $HOME/.vim/after/ftplugin/markdown.vim
6 "
7 " original version from Steve Losh's gist: https://gist.github.com/1038710
8
9 func! s:is_mkdCode(lnum)
10     return synIDattr(synID(a:lnum, 1, 0), 'name') == 'mkdCode'
11 endfunc
12
13 func! s:effective_line(lnum)
14     return s:is_mkdCode(a:lnum) ? '' : getline(a:lnum)
15 endfunc
16
17 func! Foldexpr_markdown(lnum)
18     if (a:lnum == 1)
19         let l0 = ''
20     else
21         let l0 = s:effective_line(a:lnum-1)
22     endif
23
24     let l1 = s:effective_line(a:lnum)
25
26     let l2 = s:effective_line(a:lnum+1)
27
28     if  l2 =~ '^==\+\s*'
29         " next line is underlined (level 1)
30         return '>1'
31     elseif l2 =~ '^--\+\s*'
32         " next line is underlined (level 2)
33         return '>2'
34     elseif l1 =~ '^#'
35         " don't include the section title in the fold
36         return '-1'
37     elseif l0 =~ '^#'
38         " current line starts with hashes
39         return '>'.matchend(l0, '^#\+')
40     else
41         " keep previous foldlevel
42         return '='
43     endif
44 endfunc
45
46
47 if !get(g:, "vim_markdown_folding_disabled", 0)
48   setlocal foldexpr=Foldexpr_markdown(v:lnum)
49   setlocal foldmethod=expr
50 endif