" vimtex - LaTeX plugin for Vim
"
" Maintainer: Karl Yngve Lervåg
" Email:      karl.yngve@gmail.com
"

if !exists('b:current_syntax')
  let b:current_syntax = 'tex'
elseif b:current_syntax !=# 'tex'
  echoerr 'vimtex syntax error: please report issue!'
  finish
endif

" Perform spell checking when there is no syntax
" - This will enable spell checking e.g. in toplevel of included files
syntax spell toplevel

" {{{1 Italic font, bold font and conceals

let conceal = (has('conceal') && get(g:, 'tex_conceal', 'b') =~# 'b')
      \ ? 'concealends' : ''

for [style, group, commands] in [
      \ ['texItalStyle', 'texItalGroup', ['emph', 'textit']],
      \ ['texBoldStyle', 'texBoldGroup', ['textbf']],
      \]
  for cmd in commands
    execute 'syntax region' style 'matchgroup=texTypeStyle'
          \ 'start="\\' . cmd . '\s*{" end="}"'
          \ 'contains=@' . group
          \ conceal
  endfor
  execute 'syntax cluster texMatchGroup add=' . style
endfor

" }}}1
" {{{1 Add syntax highlighting for \url and \href
syntax match texStatement '\\url\ze[^\ta-zA-Z]' nextgroup=texUrlVerb
syntax match texStatement '\\url\ze\s*{' nextgroup=texUrl
syntax match texStatement '\\href' nextgroup=texHref

syntax region texUrl     matchgroup=Delimiter start='{' end='}' contained
syntax region texUrlVerb matchgroup=Delimiter
      \ start='\z([^\ta-zA-Z]\)' end='\z1' contained

syntax region texHref matchgroup=Delimiter start='{' end='}' contained
      \ nextgroup=texHrefLinkText
syntax region texHrefLinkText matchgroup=Delimiter start='{' end='}' contained
      \ contains=@Spell

highlight link texUrl          Function
highlight link texUrlVerb      texUrl
highlight link texHref         texUrl
highlight link texHrefLinkText texSectionZone

" }}}1
" {{{1 Improve support for cite commands
syntax match texStatement
      \ "\\\%(auto\|text\)\?cite\%([tp]\*\?\|author\)\?"
      \ nextgroup=texRefOption,texCite

" }}}1
" {{{1 Add support for cleveref package
syntax region texRefZone matchgroup=texStatement
      \ start="\\\(\(label\)\?c\(page\)\?\|C\|auto\)ref{"
      \ end="}\|%stopzone\>"
      \ contains=@texRefGroup

" \crefrange, \cpagerefrange (these commands expect two arguments)
syntax match texStatement
      \ '\\c\(page\)\?refrange\>'
      \ nextgroup=texRefRangeStart skipwhite skipnl
syntax region texRefRangeStart
      \ start="{"rs=s+1  end="}"
      \ matchgroup=Delimiter
      \ contained contains=texRefZone
      \ nextgroup=texRefRangeEnd skipwhite skipnl
syntax region texRefRangeEnd
      \ start="{"rs=s+1 end="}"
      \ matchgroup=Delimiter
      \ contained contains=texRefZone

highlight link texRefRangeStart texRefZone
highlight link texRefRangeEnd   texRefZone

" }}}1
" {{{1 Add support for listings package
syntax region texZone
      \ start="\\begin{lstlisting}"rs=s
      \ end="\\end{lstlisting}\|%stopzone\>"re=e
      \ keepend
      \ contains=texBeginEnd
syntax match texInputFile
      \ "\\lstinputlisting\s*\(\[.*\]\)\={.\{-}}"
      \ contains=texStatement,texInputCurlies,texInputFileOpt
syntax match texZone "\\lstinline\s*\(\[.*\]\)\={.\{-}}"

" }}}1
" {{{1 Nested syntax highlighting for dot
unlet b:current_syntax
syntax include @DOT syntax/dot.vim
syntax region texZone
      \ start="\\begin{dot2tex}"rs=s
      \ end="\\end{dot2tex}"re=e
      \ keepend
      \ transparent
      \ contains=texBeginEnd,@DOT
let b:current_syntax = 'tex'

" }}}1
" {{{1 Nested syntax highlighting for minted

" First set all minted environments to listings
syntax region texZone
      \ start="\\begin{minted}\_[^}]\{-}{\w\+}"rs=s
      \ end="\\end{minted}"re=e
      \ keepend
      \ contains=texMinted

" Next add nested syntax support for desired languages
for entry in get(g:, 'vimtex_syntax_minted', [])
  let lang = entry.lang
  let syntax = get(entry, 'syntax', lang)

  unlet b:current_syntax
  execute 'syntax include @' . toupper(lang) 'syntax/' . syntax . '.vim'

  if has_key(entry, 'ignore')
    execute 'syntax cluster' toupper(lang)
          \ 'remove=' . join(entry.ignore, ',')
  endif

  execute 'syntax region texZone'
        \ 'start="\\begin{minted}\_[^}]\{-}{' . lang . '}"rs=s'
        \ 'end="\\end{minted}"re=e'
        \ 'keepend'
        \ 'transparent'
        \ 'contains=texMinted,@' . toupper(lang)

  "
  " Support for custom environment names
  "
  for env in get(entry, 'environments', [])
    execute 'syntax region texZone'
          \ 'start="\\begin{' . env . '}"rs=s'
          \ 'end="\\end{' . env . '}"re=e'
          \ 'keepend'
          \ 'transparent'
          \ 'contains=texBeginEnd,@' . toupper(lang)

    " Match starred environments with options
    execute 'syntax region texZone'
          \ 'start="\\begin{' . env . '\*}\s*{\_.\{-}}"rs=s'
          \ 'end="\\end{' . env . '\*}"re=e'
          \ 'keepend'
          \ 'transparent'
          \ 'contains=texMintedStarred,texBeginEnd,@' . toupper(lang)
    execute 'syntax match texMintedStarred'
          \ '"\\begin{' . env . '\*}\s*{\_.\{-}}"'
          \ 'contains=texBeginEnd,texDelimiter'
  endfor
endfor
let b:current_syntax = 'tex'

syntax match texMinted '\\begin{minted}\_[^}]\{-}{\w\+}'
      \ contains=texBeginEnd,texMintedName
syntax match texMinted '\\end{minted}'
      \ contains=texBeginEnd
syntax match texMintedName '{\w\+}' contained

highlight link texMintedName texBeginEndName

" }}}1

" vim: fdm=marker sw=2