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Markdown folding for Vim
" folding for Markdown headers, both styles (atx- and setext-)
" this code can be placed in file
" $HOME/.vim/after/ftplugin/markdown.vim
" In Markdown, setext-style overrides atx-style, so we first check for an
" underline. Empty lines should be ignored when underlined.
func! Foldexpr_markdown(lnum)
let l1 = getline(a:lnum)
if l1 =~ '^\s*$'
return '='
let l2 = getline(a:lnum+1)
if l2 =~ '^=\+\s*$'
return '>1'
elseif l2 =~ '^-\+\s*$'
return '>2'
elseif l1 =~ '^#'
return '>'.matchend(l1, '^#\+')
return '='
setl foldexpr=Foldexpr_markdown(v:lnum)
setl foldmethod=expr
"---------- everything after this is optional -----------------------
" change the following fold options to your liking
" see ':help fold-options' for more
setl foldenable
setl foldlevel=0
setl foldcolumn=0
" text of closed fold
" shows the first line as is, plus fold level and the number of hidden lines
setl foldtext=getline(v:foldstart).'\ \ \ /'.v:foldlevel.'...'.(v:foldend-v:foldstart)
"-------- other buffer- and window-local settings to override defaults
" setl wrap list
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