Change latex provider to luatex, closes #476

autoload/vimtex/syntax/load.vim

@@ -0,0 +1,82 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'latex') == -1
+
+" vimtex - LaTeX plugin for Vim
+"
+" Maintainer: Karl Yngve Lervåg
+" Email:      karl.yngve@gmail.com
+"
+
+function! vimtex#syntax#load#general() abort " {{{1
+  " I don't see why we can't match Math zones in the MatchNMGroup
+  if !exists('g:tex_no_math')
+    syntax cluster texMatchNMGroup add=@texMathZones
+  endif
+
+  " Todo elements
+  syntax match texStatement '\\todo\w*' contains=texTodo
+  syntax match texTodo '\\todo\w*'
+
+  " Fix strange mistake in main syntax file where \usepackage is added to the
+  " texInputFile group
+  syntax match texDocType /\\usepackage\>/
+        \ nextgroup=texBeginEndName,texDocTypeArgs
+
+  " Improve support for italic font, bold font and some conceals
+  if get(g:, 'tex_fast', 'b') =~# 'b'
+    let s:conceal = (has('conceal') && get(g:, 'tex_conceal', 'b') =~# 'b')
+          \ ? 'concealends' : ''
+
+    for [s:style, s:group, s:commands] in [
+          \ ['texItalStyle', 'texItalGroup', ['emph', 'textit']],
+          \ ['texBoldStyle', 'texBoldGroup', ['textbf']],
+          \]
+      for s:cmd in s:commands
+        execute 'syntax region' s:style 'matchgroup=texTypeStyle'
+              \ 'start="\\' . s:cmd . '\s*{" end="}"'
+              \ 'contains=@Spell,@' . s:group
+              \ s:conceal
+      endfor
+      execute 'syntax cluster texMatchGroup add=' . s:style
+    endfor
+  endif
+
+  " Allow arguments in newenvironments
+  syntax region texEnvName contained matchgroup=Delimiter
+        \ start="{"rs=s+1  end="}"
+        \ nextgroup=texEnvBgn,texEnvArgs contained skipwhite skipnl
+  syntax region texEnvArgs contained matchgroup=Delimiter
+        \ start="\["rs=s+1 end="]"
+        \ nextgroup=texEnvBgn,texEnvArgs skipwhite skipnl
+  syntax cluster texEnvGroup add=texDefParm,texNewEnv,texComment
+
+  " Add support for \renewenvironment and \renewcommand
+  syntax match texNewEnv "\\renewenvironment\>"
+        \ nextgroup=texEnvName skipwhite skipnl
+  syntax match texNewCmd "\\renewcommand\>"
+        \ nextgroup=texCmdName skipwhite skipnl
+
+  " Match nested DefParms
+  syntax match texDefParmNested contained "##\+\d\+"
+  highlight def link texDefParmNested Identifier
+  syntax cluster texEnvGroup add=texDefParmNested
+  syntax cluster texCmdGroup add=texDefParmNested
+endfunction
+
+" }}}1
+function! vimtex#syntax#load#packages() abort " {{{1
+  try
+    call vimtex#syntax#p#{b:vimtex.documentclass}#load()
+  catch /E117:/
+  endtry
+
+  for l:pkg in map(keys(b:vimtex.packages), "substitute(v:val, '-', '_', 'g')")
+    try
+      call vimtex#syntax#p#{l:pkg}#load()
+    catch /E117:/
+    endtry
+  endfor
+endfunction
+
+" }}}1
+
+endif