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Add tests for preamble fold of python-mode style #213
[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_li_start(line)
22     return a:line !~ '^ *\([*-]\)\%( *\1\)\{2}\%( \|\1\)*$' &&
23       \    a:line =~ '^\s*[*+-] \+'
24 endfunction
25
26 function! s:is_blank_line(line)
27     return a:line =~ '^$'
28 endfunction
29
30 function! s:prevnonblank(lnum)
31     let i = a:lnum
32     while i > 1 && s:is_blank_line(getline(i))
33         let i -= 1
34     endwhile
35     return i
36 endfunction
37
38 function GetMarkdownIndent()
39     let list_ind = 4
40     " Find a non-blank line above the current line.
41     let lnum = prevnonblank(v:lnum - 1)
42     " At the start of the file use zero indent.
43     if lnum == 0 | return 0 | endif
44     let ind = indent(lnum)
45     let line = getline(lnum)    " Last line
46     let cline = getline(v:lnum) " Current line
47     if s:is_li_start(cline) 
48         " Current line is the first line of a list item, do not change indent
49         return indent(v:lnum)
50     elseif s:is_li_start(line)
51         " Last line is the first line of a list item, increase indent
52         return ind + list_ind
53     else
54         return ind
55     endif
56 endfunction