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" folding for Markdown headers, both styles (atx- and setex-)
" http://daringfireball.net/projects/markdown/syntax#header
"
" this code can be placed in file
" $HOME/.vim/after/ftplugin/markdown.vim
"
" original version from Steve Losh's gist: https://gist.github.com/1038710
func! s:is_mkdCode(lnum)
return synIDattr(synID(a:lnum, 1, 0), 'name') == 'mkdCode'
endfunc
func! s:effective_line(lnum)
let line = getline(a:lnum)
return (line !~ '^[=-#]' || s:is_mkdCode(a:lnum)) ? '' : line
endfunc
func! Foldexpr_markdown(lnum)
let l2 = s:effective_line(a:lnum+1)
if l2 =~ '^==\+\s*'
" next line is underlined (level 1)
return '>1'
elseif l2 =~ '^--\+\s*'
" next line is underlined (level 2)
return '>2'
endif
let l1 = s:effective_line(a:lnum)
if l1 =~ '^#'
" don't include the section title in the fold
return '-1'
endif
if (a:lnum == 1)
let l0 = ''
else
let l0 = s:effective_line(a:lnum-1)
endif
if l0 =~ '^#'
" current line starts with hashes
return '>'.matchend(l0, '^#\+')
else
" keep previous foldlevel
return '='
endif
endfunc
if !get(g:, "vim_markdown_folding_disabled", 0)
setlocal foldexpr=Foldexpr_markdown(v:lnum)
setlocal foldmethod=expr
endif