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Lines which start with '-' are needed in foldexpr
[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     let line = getline(a:lnum)
15     return (line !~ '^[=-#]' || s:is_mkdCode(a:lnum)) ? '' : line
16 endfunc
17
18 func! Foldexpr_markdown(lnum)
19     let l2 = s:effective_line(a:lnum+1)
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     endif
27
28     let l1 = s:effective_line(a:lnum)
29     if l1 =~ '^#'
30         " don't include the section title in the fold
31         return '-1'
32     endif
33
34     if (a:lnum == 1)
35         let l0 = ''
36     else
37         let l0 = s:effective_line(a:lnum-1)
38     endif
39     if l0 =~ '^#'
40         " current line starts with hashes
41         return '>'.matchend(l0, '^#\+')
42     else
43         " keep previous foldlevel
44         return '='
45     endif
46 endfunc
47
48
49 if !get(g:, "vim_markdown_folding_disabled", 0)
50   setlocal foldexpr=Foldexpr_markdown(v:lnum)
51   setlocal foldmethod=expr
52 endif