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Better support for bullet insertion and auto indentation in list items.
[etc/vim.git] / indent / mkd.vim
1 if exists("b:did_indent") | finish | endif
2 let b:did_indent = 1
3
4 setlocal indentexpr=GetMkdIndent()
5 setlocal nolisp
6 setlocal nosmartindent
7 setlocal autoindent
8
9 " Only define the function once
10 if exists("*GetMkdIndent") | finish | endif
11
12 function! s:is_li_start(line)
13     return a:line =~ '^\s*[\*+-]'
14 endfunction
15
16 function! s:is_blank_line(line)
17     return a:line =~ '^$'
18 endfunction
19
20 function! s:prevnonblank(lnum)
21     let i = a:lnum
22     while i > 1 && s:is_blank_line(getline(i))
23         let i -= 1
24     endwhile
25     return i
26 endfunction
27
28 function GetMkdIndent()
29     let list_ind = 4
30     " Find a non-blank line above the current line.
31     let lnum = prevnonblank(v:lnum - 1)
32     " At the start of the file use zero indent.
33     if lnum == 0 | return 0 | endif
34     let ind = indent(lnum)
35     let line = getline(lnum)    " Last line
36     let cline = getline(v:lnum) " Current line
37     if s:is_li_start(cline) 
38         " Current line is the first line of a list item, do not change indent
39         return indent(v:lnum)
40     elseif s:is_li_start(line)
41         " Last line is the first line of a list item, increase indent
42         return ind + list_ind
43     else
44         return ind
45     endif
46 endfunction