" Vim syntax file
" Language:	Markdown
" Maintainer:	urosm <urosm@kompot.si>
" Last Change:	2024 Feb 14

if exists("b:current_syntax")
  finish
endif

syntax spell toplevel

" emphasis
syn region markdownItalic matchgroup=markdownDelimiter start=/\\\@1<!\(\_^\|\s\|[[:punct:]]\)\@<=\*\S\@=/ skip=/\(\*\*\|__\)/ end=/\*\([[:punct:]]\|\s\|\_$\)\@=/ contains=@Spell
syn region markdownItalic matchgroup=markdownDelimiter start=/\\\@1<!\(\_^\|\s\|[[:punct:]]\)\@<=_\S\@=/ skip=/\(\*\*\|__\)/ end=/\S\@1<=_\([[:punct:]]\|\s\|\_$\)\@=/ contains=@Spell

" bold
syn region markdownBold matchgroup=markdownDelimiter start=/\(\\\@<!\*\)\{2}/ end=/\(\\\@<!\*\)\{2}/ contains=@Spell
syn region markdownBold matchgroup=markdownDelimiter start=/__/ end=/__/ contains=@Spell

" bold italic
syn region markdownBoldItalic matchgroup=markdownDelimiter start=/\*\{3}\(\S[^*]*\(\*\S\|\n[^*]*\*\S\)\)\@=/ end=/\S\@<=\*\{3}/ contains=@Spell
syn region markdownBoldItalic matchgroup=markdownDelimiter start=/\(___\)\S\@=/ end=/\S\@<=___/ contains=@Spell

syn region markdownBoldInItalic matchgroup=markdownDelimiter start=/\*\*/ end=/\*\*/ contained containedin=markdownItalic contains=@Spell
syn region markdownBoldInItalic matchgroup=markdownDelimiter start=/__/ end=/__/ contained containedin=markdownItalic contains=@Spell
hi def link markdownBoldInItalic markdownBoldItalic

syn region markdownItalicInBold matchgroup=markdownDelimiter start=/\\\@1<!\(\_^\|\s\|[[:punct:]]\)\@<=\*\S\@=/ skip=/\(\*\*\|__\)/ end=/\S\@<=\*\([[:punct:]]\|\s\|\_$\)\@=/ contained containedin=markdownBold contains=@Spell
syn region markdownItalicInBold matchgroup=markdownDelimiter start=/\\\@<!\(\_^\|\s\|[[:punct:]]\)\@<=_\S\@=/ skip=/\(\*\*\|__\)/ end=/\S\@<=_\([[:punct:]]\|\s\|\_$\)\@=/ contained containedin=markdownBold contains=@Spell
hi def link markdownItalicInBold markdownBoldItalic

" link
syn match markdownLink /!\=\[\_.\{-}\](\_.\{-})/ contains=markdownLinkLabel,markdownLinkURL
syn match markdownLinkLabel /\[\zs.*\ze\]/ contained
hi def link markdownLinkLabel markdownLabel
syn match markdownLinkURL /.*(\zs.*\ze)/ contained
hi def link markdownLinkURL markdownUnderlined

" automatic link
syn match markdownAutomaticLink /<\(https\{0,1}.\{-}\|[A-Za-z0-9!#$%&'*+\-/=?^_`{|}~.]\{-}@[A-Za-z0-9\-]\{-}\.\w\{-}\)>/
hi def link markdownAutomaticLink markdownUnderlined

" wikilink
" NOTE: update to support newlines in titles
syn match markdownWikilink /\[\[.*\]\]/ contains=markdownWikilinkLabel,markdownWikilinkURL
syn match markdownWikilinkLabel /\[\[\zs.\{-}\ze|.*\]\]/ contained
hi def link markdownWikilinkLabel markdownLabel
syn match markdownWikilinkURL /\%(\[\[\||\)\zs[^|]*\ze\]\]/ contained
hi def link markdownWikilinkURL markdownUnderlined

" footnote reference
syn match markdownFootnoteReference /\[\zs\^.\{-}\ze\]/
hi def link markdownFootnoteReference markdownLabel

" reference key
syn match markdownReferenceKey /@[[:alnum:]_][[:digit:][:lower:][:upper:]_:.#$%&-+?<>~\/]*/
hi def link markdownReferenceKey markdownLabel

" html comment
syn region markdownHTMLcomment start=/<!--/ end=/-->/ keepend contains=@Spell
hi def link markdownHTMLcomment markdownComment

" yaml
syn include @YAML syntax/yaml.vim
unlet! b:current_syntax
syn region markdownYAMLHeader start=/\%(\%^\|\_^\s*\n\)\@<=\_^-\{3}\ze\n.\+/ end=/^\([-.]\)\1\{2}$/ keepend contains=@YAML containedin=TOP

" styling
hi def link markdownComment Comment
hi def link markdownConstant Constant
hi def link markdownString String
hi def link markdownCharacter Character
hi def link markdownNumber Number
hi def link markdownBoolean Boolean
hi def link markdownFloat Float
hi def link markdownIdentifier Identifier
hi def link markdownFunction Function
hi def link markdownStatement Statement
hi def link markdownConditional Conditional
hi def link markdownRepeat Repeat
hi def link markdownLabel Label
hi def link markdownOperator Operator
hi def link markdownKeyword Keyword
hi def link markdownException Exception
hi def link markdownPreProc PreProc
hi def link markdownInclude Include
hi def link markdownDefine Define
hi def link markdownMacro Macro
hi def link markdownPreCondit PreCondit
hi def link markdownType Type
hi def link markdownStorageClass StorageClass
hi def link markdownStructure Structure
hi def link markdownTypedef Typedef
hi def link markdownSpecial Special
hi def link markdownSpecialChar SpecialChar
hi def link markdownTag Tag
hi def link markdownDelimiter Delimiter
hi def link markdownSpecialComment SpecialComment
hi def link markdownDebug Debug
hi def link markdownUnderlined Underlined
hi def link markdownIgnore Ignore
hi def link markdownError Error

hi def link markdownItalic Italic
hi def link markdownBold Bold
hi def link markdownBoldItalic BoldItalic
hi def link markdownStrike Strike
hi def link markdownTitle Title

let b:current_syntax = "markdown"

" vim:set sw=2: