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Change filetype markdown
[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 function! s:is_mkdCode(lnum)
10     return synIDattr(synID(a:lnum, 1, 0), 'name') == 'mkdCode'
11 endfunction
12
13 if get(g:, "vim_markdown_folding_style_pythonic", 0)
14     function! Foldexpr_markdown(lnum)
15         let l2 = getline(a:lnum+1)
16         if  l2 =~ '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
17             " next line is underlined (level 1)
18             return '>0'
19         elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
20             " next line is underlined (level 2)
21             return '>1'
22         endif
23
24         let l1 = getline(a:lnum)
25         if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
26             " current line starts with hashes
27             return '>'.(matchend(l1, '^#\+') - 1)
28         elseif a:lnum == 1
29             " fold any 'preamble'
30             return '>1'
31         else
32             " keep previous foldlevel
33             return '='
34         endif
35     endfunction
36
37     function! Foldtext_markdown()
38         let line = getline(v:foldstart)
39         let has_numbers = &number || &relativenumber
40         let nucolwidth = &fdc + has_numbers * &numberwidth
41         let windowwidth = winwidth(0) - nucolwidth - 6
42         let foldedlinecount = v:foldend - v:foldstart
43         let line = strpart(line, 0, windowwidth - 2 -len(foldedlinecount))
44         let line = substitute(line, '\%("""\|''''''\)', '', '')
45         let fillcharcount = windowwidth - len(line) - len(foldedlinecount) + 1
46         return line . ' ' . repeat("-", fillcharcount) . ' ' . foldedlinecount
47     endfunction
48 else
49     function! Foldexpr_markdown(lnum)
50         let l2 = getline(a:lnum+1)
51         if  l2 =~ '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
52             " next line is underlined (level 1)
53             return '>1'
54         elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
55             " next line is underlined (level 2)
56             return '>2'
57         endif
58
59         let l1 = getline(a:lnum)
60         if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
61             " don't include the section title in the fold
62             return '-1'
63         endif
64
65         if (a:lnum == 1)
66             let l0 = ''
67         else
68             let l0 = getline(a:lnum-1)
69         endif
70         if l0 =~ '^#' && !s:is_mkdCode(a:lnum-1)
71             " current line starts with hashes
72             return '>'.matchend(l0, '^#\+')
73         else
74             " keep previous foldlevel
75             return '='
76         endif
77     endfunction
78 endif
79
80 if !get(g:, "vim_markdown_folding_disabled", 0)
81     setlocal foldexpr=Foldexpr_markdown(v:lnum)
82     setlocal foldmethod=expr
83     if get(g:, "vim_markdown_folding_style_pythonic", 0)
84         setlocal foldtext=Foldtext_markdown()
85     endif
86 endif