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586ff2f5b001ee8490c5a6f7d6f8e1fd74b8d2ab
[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 "   $HOME/.vim/after/ftplugin/markdown.vim
6 "
7 " original version from Steve Losh's gist: https://gist.github.com/1038710
8
9 function! s:is_mkdCode(lnum)
10     let name = synIDattr(synID(a:lnum, 1, 0), 'name')
11     return (name =~ '^mkd\%(Code$\|Snippet\)' || name != '' && name !~ '^\%(mkd\|html\)')
12 endfunction
13
14 if get(g:, "vim_markdown_folding_style_pythonic", 0)
15     function! Foldexpr_markdown(lnum)
16         let l1 = getline(a:lnum)
17         " keep track of fenced code blocks
18         if l1 =~ '````*' || l1 =~ '\~\~\~\~*'
19             if b:fenced_block == 0
20                 let b:fenced_block = 1
21             elseif b:fenced_block == 1
22                 let b:fenced_block = 0
23             endif
24         endif
25
26         let l2 = getline(a:lnum+1)
27         if l2 =~ '^==\+\s*' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum+1)
28             " next line is underlined (level 1)
29             return '>0'
30         elseif l2 =~ '^--\+\s*' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum+1)
31             " next line is underlined (level 2)
32             return '>1'
33         endif
34
35         if l1 =~ '^#' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum)
36             " current line starts with hashes
37             return '>'.(matchend(l1, '^#\+') - 1)
38         elseif a:lnum == 1
39             " fold any 'preamble'
40             return '>1'
41         else
42             " keep previous foldlevel
43             return '='
44         endif
45     endfunction
46
47     function! Foldtext_markdown()
48         let line = getline(v:foldstart)
49         let has_numbers = &number || &relativenumber
50         let nucolwidth = &fdc + has_numbers * &numberwidth
51         let windowwidth = winwidth(0) - nucolwidth - 6
52         let foldedlinecount = v:foldend - v:foldstart
53         let line = strpart(line, 0, windowwidth - 2 -len(foldedlinecount))
54         let line = substitute(line, '\%("""\|''''''\)', '', '')
55         let fillcharcount = windowwidth - len(line) - len(foldedlinecount) + 1
56         return line . ' ' . repeat("-", fillcharcount) . ' ' . foldedlinecount
57     endfunction
58 else
59     function! Foldexpr_markdown(lnum)
60         if (a:lnum == 1)
61             let l0 = ''
62         else
63             let l0 = getline(a:lnum-1)
64         endif
65         " keep track of fenced code blocks
66         if l0 =~ '````*' || l0 =~ '\~\~\~\~*'
67             if b:fenced_block == 0
68                 let b:fenced_block = 1
69             elseif b:fenced_block == 1
70                 let b:fenced_block = 0
71             endif
72         endif
73
74         let l2 = getline(a:lnum+1)
75         if  l2 =~ '^==\+\s*' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum+1)
76             " next line is underlined (level 1)
77             return '>1'
78         elseif l2 =~ '^--\+\s*' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum+1)
79             " next line is underlined (level 2)
80             if g:vim_markdown_folding_level >= 2
81                 return '>1'
82             else
83                 return '>2'
84             endif
85         endif
86
87         let l1 = getline(a:lnum)
88         if l1 =~ '^#' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum)
89             " fold level according to option
90             let l:level = matchend(l1, '^#\+')
91             if g:vim_markdown_folding_level == 1 || l:level > g:vim_markdown_folding_level
92                 return -1
93             else
94                 " headers are not folded
95                 return 0
96             endif
97         endif
98
99         if l0 =~ '^#' && b:fenced_block == 0 && !s:is_mkdCode(a:lnum-1)
100             " current line starts with hashes
101             return '>'.matchend(l0, '^#\+')
102         else
103             " fold here because of setext headers
104             return '='
105         endif
106     endfunction
107 endif
108
109
110 let b:fenced_block = 0
111 let g:vim_markdown_folding_level = get(g:, "vim_markdown_folding_level", 1)
112
113 if !get(g:, "vim_markdown_folding_disabled", 0)
114     setlocal foldexpr=Foldexpr_markdown(v:lnum)
115     setlocal foldmethod=expr
116     if get(g:, "vim_markdown_folding_style_pythonic", 0)
117         setlocal foldtext=Foldtext_markdown()
118     endif
119 endif