Change latex provider to luatex, closes #476

autoload/vimtex/syntax/p/amsmath.vim

@@ -0,0 +1,47 @@
+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
+"
+
+scriptencoding utf-8
+
+function! vimtex#syntax#p#amsmath#load() abort " {{{1
+  if has_key(b:vimtex_syntax, 'amsmath') | return | endif
+  let b:vimtex_syntax.amsmath = 1
+
+  " Allow subequations (fixes #1019)
+  " - This should be temporary, as it seems subequations is erroneously part of
+  "   texBadMath from Charles Campbell's syntax plugin.
+  syntax match texBeginEnd
+        \ "\(\\begin\>\|\\end\>\)\ze{subequations}"
+        \ nextgroup=texBeginEndName
+
+  call vimtex#syntax#misc#new_math_zone('AmsA', 'align', 1)
+  call vimtex#syntax#misc#new_math_zone('AmsB', 'alignat', 1)
+  call vimtex#syntax#misc#new_math_zone('AmsD', 'flalign', 1)
+  call vimtex#syntax#misc#new_math_zone('AmsC', 'gather', 1)
+  call vimtex#syntax#misc#new_math_zone('AmsD', 'multline', 1)
+  call vimtex#syntax#misc#new_math_zone('AmsE', 'xalignat', 1)
+  call vimtex#syntax#misc#new_math_zone('AmsF', 'xxalignat', 0)
+  call vimtex#syntax#misc#new_math_zone('AmsG', 'mathpar', 1)
+
+  " Amsmath [lr][vV]ert  (Holger Mitschke)
+  if has('conceal') && &enc ==# 'utf-8' && get(g:, 'tex_conceal', 'd') =~# 'd'
+    for l:texmath in [
+          \ ['\\lvert', '|'] ,
+          \ ['\\rvert', '|'] ,
+          \ ['\\lVert', '‖'] ,
+          \ ['\\rVert', '‖'] ,
+          \ ]
+        execute "syntax match texMathDelim '\\\\[bB]igg\\=[lr]\\="
+              \ . l:texmath[0] . "' contained conceal cchar=" . l:texmath[1]
+    endfor
+  endif
+endfunction
+
+" }}}1
+
+endif