syn region mkdLink matchgroup=mkdDelimiter start="\!\?\[" end="\]\ze\s*[[(]" contains=@Spell nextgroup=mkdURL,mkdID skipwhite
syn region mkdID matchgroup=mkdDelimiter start="\[" end="\]" contained
syn region mkdURL matchgroup=mkdDelimiter start="(" end=")" contained
+" mkd inline links: protocol optional user:pass@ sub/domain .com, .co.uk, etc optional port path/querystring/hash fragment
+" ------------ _____________________ --------------------------- ________________________ ----------------- __
+syntax match mkdInlineURL /https\?:\/\/\(\w\+\(:\w\+\)\?@\)\?\([A-Za-z][-_0-9A-Za-z]*\.\)\{1,}\(\w\{2,}\.\?\)\{1,}\(:[0-9]\{1,5}\)\?\S*/
" Link definitions: [id]: URL (Optional Title)
" TODO handle automatic links without colliding with htmlTag (<URL>)
syn match htmlH1 /^.\+\n=\+$/ contains=@Spell
syn match htmlH2 /^.\+\n-\+$/ contains=@Spell
+
+
+" fold region for headings
+syn region mkdHeaderFold
+ \ start="^\s*\z(#\+\)"
+ \ skip="^\s*\z1#\+"
+ \ end="^\(\s*#\)\@="
+ \ fold contains=TOP
+
+" fold region for lists
+syn region mkdListFold
+ \ start="^\z(\s*\)\*\z(\s*\)"
+ \ skip="^\z1 \z2\s*[^#]"
+ \ end="^\(.\)\@="
+ \ fold contains=TOP
+
+syn sync fromstart
+setlocal foldmethod=syntax
+
+
+
"highlighting for Markdown groups
HtmlHiLink mkdString String
HtmlHiLink mkdCode String
HtmlHiLink mkdLineBreak Todo
HtmlHiLink mkdLink htmlLink
HtmlHiLink mkdURL htmlString
+HtmlHiLink mkdInlineURL htmlLink
HtmlHiLink mkdID Identifier
HtmlHiLink mkdLinkDef mkdID
HtmlHiLink mkdLinkDefTarget mkdURL