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Implement "edit link in Vim" shortcut
[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         elseif g:vim_markdown_frontmatter == 1
25             if b:front_matter == 1 && a:lnum > 2
26                 let l0 = getline(a:lnum-1)
27                 if l0 == '---'
28                     let b:front_matter = 0
29                 endif
30             elseif a:lnum == 1
31                 if l1 == '---'
32                     let b:front_matter = 1
33                 endif
34             endif
35         endif
36
37         if b:fenced_block == 1 || b:front_matter == 1
38             if a:lnum == 1
39                 " fold any 'preamble'
40                 return '>1'
41             else
42                 " keep previous foldlevel
43                 return '='
44             endif
45         endif
46
47         let l2 = getline(a:lnum+1)
48         if l2 =~ '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
49             " next line is underlined (level 1)
50             return '>0'
51         elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
52             " next line is underlined (level 2)
53             return '>1'
54         endif
55
56         if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
57             " current line starts with hashes
58             return '>'.(matchend(l1, '^#\+') - 1)
59         elseif a:lnum == 1
60             " fold any 'preamble'
61             return '>1'
62         else
63             " keep previous foldlevel
64             return '='
65         endif
66     endfunction
67
68     function! Foldtext_markdown()
69         let line = getline(v:foldstart)
70         let has_numbers = &number || &relativenumber
71         let nucolwidth = &fdc + has_numbers * &numberwidth
72         let windowwidth = winwidth(0) - nucolwidth - 6
73         let foldedlinecount = v:foldend - v:foldstart
74         let line = strpart(line, 0, windowwidth - 2 -len(foldedlinecount))
75         let line = substitute(line, '\%("""\|''''''\)', '', '')
76         let fillcharcount = windowwidth - len(line) - len(foldedlinecount) + 1
77         return line . ' ' . repeat("-", fillcharcount) . ' ' . foldedlinecount
78     endfunction
79 else
80     function! Foldexpr_markdown(lnum)
81         if (a:lnum == 1)
82             let l0 = ''
83         else
84             let l0 = getline(a:lnum-1)
85         endif
86
87         " keep track of fenced code blocks
88         if l0 =~ '````*' || l0 =~ '\~\~\~\~*'
89             if b:fenced_block == 0
90                 let b:fenced_block = 1
91             elseif b:fenced_block == 1
92                 let b:fenced_block = 0
93             endif
94         elseif g:vim_markdown_frontmatter == 1
95             if b:front_matter == 1
96                 if l0 == '---'
97                     let b:front_matter = 0
98                 endif
99             elseif a:lnum == 2
100                 if l0 == '---'
101                     let b:front_matter = 1
102                 endif
103             endif
104         endif
105
106         if b:fenced_block == 1 || b:front_matter == 1
107             " keep previous foldlevel
108             return '='
109         endif
110
111         let l2 = getline(a:lnum+1)
112         if  l2 =~ '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
113             " next line is underlined (level 1)
114             return '>1'
115         elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
116             " next line is underlined (level 2)
117             if s:vim_markdown_folding_level >= 2
118                 return '>1'
119             else
120                 return '>2'
121             endif
122         endif
123
124         let l1 = getline(a:lnum)
125         if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
126             " fold level according to option
127             if s:vim_markdown_folding_level == 1 || matchend(l1, '^#\+') > s:vim_markdown_folding_level
128                 return -1
129             else
130                 " headers are not folded
131                 return 0
132             endif
133         endif
134
135         if l0 =~ '^#' && !s:is_mkdCode(a:lnum-1)
136             " current line starts with hashes
137             return '>'.matchend(l0, '^#\+')
138         else
139             " keep previous foldlevel
140             return '='
141         endif
142     endfunction
143 endif
144
145
146 let b:fenced_block = 0
147 let b:front_matter = 0
148 let s:vim_markdown_folding_level = get(g:, "vim_markdown_folding_level", 1)
149
150 if !get(g:, "vim_markdown_folding_disabled", 0)
151     setlocal foldexpr=Foldexpr_markdown(v:lnum)
152     setlocal foldmethod=expr
153     if get(g:, "vim_markdown_folding_style_pythonic", 0)
154         setlocal foldtext=Foldtext_markdown()
155     endif
156 endif