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Merge pull request #241 from alexconst/fix/hash_comments
[etc/vim.git] / indent / markdown.vim
1 if exists("b:did_indent") | finish | endif
2 let b:did_indent = 1
3
4 setlocal indentexpr=GetMarkdownIndent()
5 setlocal nolisp
6 setlocal autoindent
7
8 " Automatically insert bullets
9 setlocal formatoptions+=r
10 " Do not automatically insert bullets when auto-wrapping with text-width
11 setlocal formatoptions-=c
12 " Accept various markers as bullets
13 setlocal comments=b:*,b:+,b:-
14
15 " Automatically continue blockquote on line break
16 setlocal comments+=b:>
17
18 " Only define the function once
19 if exists("*GetMarkdownIndent") | finish | endif
20
21 function! s:is_mkdCode(lnum)
22     let name = synIDattr(synID(a:lnum, 1, 0), 'name')
23     return (name =~ '^mkd\%(Code$\|Snippet\)' || name != '' && name !~ '^\%(mkd\|html\)')
24 endfunction
25
26 function! s:is_li_start(line)
27     return a:line !~ '^ *\([*-]\)\%( *\1\)\{2}\%( \|\1\)*$' &&
28       \    a:line =~ '^\s*[*+-] \+'
29 endfunction
30
31 function! s:is_blank_line(line)
32     return a:line =~ '^$'
33 endfunction
34
35 function! s:prevnonblank(lnum)
36     let i = a:lnum
37     while i > 1 && s:is_blank_line(getline(i))
38         let i -= 1
39     endwhile
40     return i
41 endfunction
42
43 function GetMarkdownIndent()
44     let list_ind = 4
45     " Find a non-blank line above the current line.
46     let lnum = prevnonblank(v:lnum - 1)
47     " At the start of the file use zero indent.
48     if lnum == 0 | return 0 | endif
49     let ind = indent(lnum)
50     let line = getline(lnum)    " Last line
51     let cline = getline(v:lnum) " Current line
52     if s:is_li_start(cline) 
53         " Current line is the first line of a list item, do not change indent
54         return indent(v:lnum)
55     elseif s:is_li_start(line)
56         if s:is_mkdCode(lnum)
57             return ind
58         else
59             " Last line is the first line of a list item, increase indent
60             return ind + list_ind
61         end
62     else
63         return ind
64     endif
65 endfunction