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next, previous and current work for setext headers
[etc/vim.git] / after / ftplugin / mkd.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! Foldexpr_markdown(lnum)
10     if (a:lnum == 1)
11         let l0 = ''
12     else
13         let l0 = getline(a:lnum-1)
14     endif
15
16     let l1 = getline(a:lnum)
17
18     let l2 = getline(a:lnum+1)
19
20     if  l2 =~ '^==\+\s*'
21         " next line is underlined (level 1)
22         return '>1'
23     elseif l2 =~ '^--\+\s*'
24         " next line is underlined (level 2)
25         return '>2'
26     elseif l1 =~ '^#'
27         " don't include the section title in the fold
28         return '-1'
29     elseif l0 =~ '^#'
30         " current line starts with hashes
31         return '>'.matchend(l0, '^#\+')
32     else
33         " keep previous foldlevel
34         return '='
35     endif
36 endfunc
37
38
39 if !exists("g:vim_markdown_folding_disabled")
40   setlocal foldexpr=Foldexpr_markdown(v:lnum)
41   setlocal foldmethod=expr
42
43   "---------- everything after this is optional -----------------------
44   " change the following fold options to your liking
45   " see ':help fold-options' for more
46   setlocal foldenable
47   setlocal foldlevel=0
48   setlocal foldcolumn=0
49   set foldmethod=expr
50   set foldopen-=search
51 endif