ultimate-vim/sources_non_forked/vim-markdown/ftplugin/markdown.vim

" Vim filetype plugin
" Language:		Markdown
" Maintainer:		Tim Pope <vimNOSPAM@tpope.org>
" Last Change:		2013 May 30

if exists("b:did_ftplugin")
  finish
endif

runtime! ftplugin/html.vim ftplugin/html_*.vim ftplugin/html/*.vim

setlocal comments=fb:*,fb:-,fb:+,n:> commentstring=<!--%s-->
setlocal formatoptions+=tcqln formatoptions-=r formatoptions-=o
setlocal formatlistpat=^\\s*\\d\\+\\.\\s\\+\\\|^[-*+]\\s\\+\\\|^\\[^\\ze[^\\]]\\+\\]:

if exists('b:undo_ftplugin')
  let b:undo_ftplugin .= "|setl cms< com< fo< flp<"
else
  let b:undo_ftplugin = "setl cms< com< fo< flp<"
endif

function! MarkdownFold()
  let line = getline(v:lnum)

  " Regular headers
  let depth = match(line, '\(^#\+\)\@<=\( .*$\)\@=')
  if depth > 0
    return ">" . depth
  endif

  " Setext style headings
  let nextline = getline(v:lnum + 1)
  if (line =~ '^.\+$') && (nextline =~ '^=\+$')
    return ">1"
  endif

  if (line =~ '^.\+$') && (nextline =~ '^-\+$')
    return ">2"
  endif

  return "="
endfunction

function! MarkdownFoldText()
  let hash_indent = s:HashIndent(v:foldstart)
  let title = substitute(getline(v:foldstart), '^#\+\s*', '', '')
  let foldsize = (v:foldend - v:foldstart + 1)
  let linecount = '['.foldsize.' lines]'
  return hash_indent.' '.title.' '.linecount
endfunction

function! s:HashIndent(lnum)
  let hash_header = matchstr(getline(a:lnum), '^#\{1,6}')
  if len(hash_header) > 0
    " hashtag header
    return hash_header
  else
    " == or -- header
    let nextline = getline(a:lnum + 1)
    if nextline =~ '^=\+\s*$'
      return repeat('#', 1)
    elseif nextline =~ '^-\+\s*$'
      return repeat('#', 2)
    endif
  endif
endfunction

if has("folding") && exists("g:markdown_folding")
  setlocal foldexpr=MarkdownFold()
  setlocal foldmethod=expr
  setlocal foldtext=MarkdownFoldText()
  let b:undo_ftplugin .= " foldexpr< foldmethod< foldtext<"
endif

" vim:set sw=2: