syn case ignore
syn sync linebreaks=1
+let s:conceal = ''
+let s:concealends = ''
+if has('conceal')
+ let s:conceal = ' conceal'
+ let s:concealends = ' concealends'
+endif
+
"additions to HTML groups
-syn region htmlItalic start="\\\@<!\*\ze\S" end="\S\zs\\\@<!\*" keepend oneline
-syn region htmlItalic start="\(^\|\s\)\@<=_\|\\\@<!_\([^_]\+\s\)\@=" end="\S\@<=[^\\]_\|[^\\]_\S\@=" keepend oneline
-syn region htmlBold start="\*\*\ze\S" end="\S\zs\*\*" keepend oneline
-syn region htmlBold start="__\ze\S" end="\S\zs__" keepend oneline
-syn region htmlBoldItalic start="\*\*\*\ze\S" end="\S\zs\*\*\*" keepend oneline
-syn region htmlBoldItalic start="___\ze\S" end="\S\zs___" keepend oneline
+syn region htmlItalic start="\%(^\|\s\)\zs\*\ze[^\\\*\t ]" end="[^\\\*\t ]\zs\*\ze\_W" keepend
+syn region htmlItalic start="\%(^\|\s\)\zs_\ze[^\\_\t ]" end="[^\\_\t ]\zs_\ze\_W" keepend
+syn region htmlBold start="\*\*\ze\S" end="\S\zs\*\*" keepend
+syn region htmlBold start="__\ze\S" end="\S\zs__" keepend
+syn region htmlBoldItalic start="\*\*\*\ze\S" end="\S\zs\*\*\*" keepend
+syn region htmlBoldItalic start="___\ze\S" end="\S\zs___" keepend
" [link](URL) | [link][id] | [link][] | ![image](URL)
syn region mkdFootnotes matchgroup=mkdDelimiter start="\[^" end="\]"
-syn region mkdID matchgroup=mkdDelimiter start="\[" end="\]" contained oneline
-syn region mkdURL matchgroup=mkdDelimiter start="(" end=")" contained oneline
-syn region mkdLink matchgroup=mkdDelimiter start="\\\@<!!\?\[" end="\]\ze\s*[[(]" contains=@mkdNonListItem,@Spell nextgroup=mkdURL,mkdID skipwhite oneline
+execute 'syn region mkdID matchgroup=mkdDelimiter start="\[" end="\]" contained oneline' . s:conceal
+execute 'syn region mkdURL matchgroup=mkdDelimiter start="(" end=")" contained oneline' . s:conceal
+execute 'syn region mkdLink matchgroup=mkdDelimiter start="\\\@<!!\?\[" end="\]\ze[[(]" contains=@mkdNonListItem,@Spell nextgroup=mkdURL,mkdID skipwhite oneline' . s:concealends
" Autolink without angle brackets.
" mkd inline links: protocol optional user:pass@ sub/domain .com, .co.uk, etc optional port path/querystring/hash fragment
syn region mkdCode start="<code[^>]*>" end="</code>"
syn region mkdFootnote start="\[^" end="\]"
syn match mkdCode /^\s*\n\(\(\s\{8,}[^ ]\|\t\t\+[^\t]\).*\n\)\+/
+syn match mkdCode /\%^\(\(\s\{4,}[^ ]\|\t\+[^\t]\).*\n\)\+/
syn match mkdCode /^\s*\n\(\(\s\{4,}[^ ]\|\t\+[^\t]\).*\n\)\+/ contained
syn region mkdListItemLine matchgroup=mkdListItem start="^\s*\%([-*+]\|\d\+\.\)\s\+" end="$" contains=@mkdNonListItem,@Spell
syn region mkdNonListItemBlock start="\(\%^\(\s*\([-*+]\|\d\+\.\)\s\+\)\@!\|\n\(\_^\_$\|\s\{4,}[^ ]\|\t+[^\t]\)\@!\)" end="^\(\s*\([-*+]\|\d\+\.\)\s\+\)\@=" contains=@mkdNonListItem,@Spell