feat(syntax): support zref-clever

refer: #2394

Author: lervag

autoload/vimtex/syntax/p/zref_clever.vim

@@ -0,0 +1,29 @@
+" VimTeX - LaTeX plugin for Vim
+"
+" Maintainer: Karl Yngve Lervåg
+" Email:      karl.yngve@gmail.com
+"
+
+function! vimtex#syntax#p#zref_clever#load(cfg) abort " {{{1
+  syntax match texCmdZRef "\v\\zc?ref>"
+        \ skipwhite skipnl
+        \ nextgroup=texZRefArg
+
+  syntax match texCmdZRef "\\zlabel\>"
+        \ skipwhite skipnl
+        \ nextgroup=texZRefOpt,texRefArg
+
+  call vimtex#syntax#core#new_arg('texZRefArg', {
+        \ 'contains': 'texComment,@NoSpell',
+        \})
+  call vimtex#syntax#core#new_opt('texZRefOpt', {
+        \ 'next': 'texRefArg',
+        \ 'opts': 'oneline',
+        \})
+
+  highlight def link texZRefArg           texRefArg
+  highlight def link texZRefOpt           texRefOpt
+  highlight def link texCmdZRef           texCmdRef
+endfunction
+
+" }}}1

test/test-syntax/test-zref.tex

@@ -0,0 +1,19 @@
+\documentclass{scrartcl}
+\usepackage{amsmath}
+\usepackage{hyperref}
+\usepackage{zref-user}
+\usepackage{zref-clever}
+
+\begin{document}
+
+\section{sub3 with spaces}\zlabel{sec:sub3 with spaces}
+
+\begin{equation}
+  f(x) = 42
+  \label{eq:sub3 with spaces}
+\end{equation}
+
+This is \zcref{sec:sub3 with spaces}, and \zcref{eq:sub3 with spaces} is up top.
+The same here, but without anything clever done to it: \zref{eq:sub3 with spaces}.
+
+\end{document}