1 files changed, 111 insertions, 0 deletions
diff --git a/autoload/vimtex/matchparen.vim b/autoload/vimtex/matchparen.vim
new file mode 100644
index 00000000..80442cd9
--- /dev/null
+++ b/autoload/vimtex/matchparen.vim
@@ -0,0 +1,111 @@
+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#matchparen#init_buffer() abort " {{{1
+  if !g:vimtex_matchparen_enabled | return | endif
+
+  call vimtex#matchparen#enable()
+endfunction
+
+" }}}1
+
+function! vimtex#matchparen#enable() abort " {{{1
+  call s:matchparen.enable()
+endfunction
+
+" }}}1
+function! vimtex#matchparen#disable() abort " {{{1
+  call s:matchparen.disable()
+endfunction
+
+" }}}1
+function! vimtex#matchparen#popup_check(...) abort " {{{1
+  if pumvisible()
+    call s:matchparen.highlight()
+  endif
+endfunction
+
+" }}}1
+
+let s:matchparen = {}
+
+function! s:matchparen.enable() abort dict " {{{1
+  " vint: -ProhibitAutocmdWithNoGroup
+
+  execute 'augroup vimtex_matchparen' . bufnr('%')
+    autocmd!
+    autocmd CursorMoved  <buffer> call s:matchparen.highlight()
+    autocmd CursorMovedI <buffer> call s:matchparen.highlight()
+    try
+      autocmd TextChangedP <buffer> call s:matchparen.highlight()
+    catch /E216/
+      silent! let self.timer =
+            \ timer_start(50, 'vimtex#matchparen#popup_check', {'repeat' : -1})
+    endtry
+  augroup END
+
+  call self.highlight()
+
+  " vint: +ProhibitAutocmdWithNoGroup
+endfunction
+
+" }}}1
+function! s:matchparen.disable() abort dict " {{{1
+  call self.clear()
+  execute 'autocmd! vimtex_matchparen' . bufnr('%')
+  silent! call timer_stop(self.timer)
+endfunction
+
+" }}}1
+function! s:matchparen.clear() abort dict " {{{1
+  silent! call matchdelete(w:vimtex_match_id1)
+  silent! call matchdelete(w:vimtex_match_id2)
+  unlet! w:vimtex_match_id1
+  unlet! w:vimtex_match_id2
+endfunction
+function! s:matchparen.highlight() abort dict " {{{1
+  call self.clear()
+
+  if vimtex#util#in_comment() | return | endif
+
+  " This is a hack to ensure that $ in visual block mode adhers to the rule
+  " specified in :help v_$
+  if mode() ==# "\<c-v>"
+    let l:pos = vimtex#pos#get_cursor()
+    if len(l:pos) == 5 && l:pos[-1] == 2147483647
+      call feedkeys('$', 'in')
+    endif
+  endif
+
+  let l:current = vimtex#delim#get_current('all', 'both')
+  if empty(l:current) | return | endif
+
+  let l:corresponding = vimtex#delim#get_matching(l:current)
+  if empty(l:corresponding) | return | endif
+  if empty(l:corresponding.match) | return | endif
+
+  let [l:open, l:close] = l:current.is_open
+        \ ? [l:current, l:corresponding]
+        \ : [l:corresponding, l:current]
+
+  if exists('*matchaddpos')
+    let w:vimtex_match_id1 = matchaddpos('MatchParen',
+          \ [[l:open.lnum, l:open.cnum, strlen(l:open.match)]])
+    let w:vimtex_match_id2 = matchaddpos('MatchParen',
+          \ [[l:close.lnum, l:close.cnum, strlen(l:close.match)]])
+  else
+    let w:vimtex_match_id1 = matchadd('MatchParen',
+          \ '\%' . l:open.lnum . 'l\%' . l:open.cnum . 'c' . l:open.re.this)
+    let w:vimtex_match_id2 = matchadd('MatchParen',
+          \ '\%' . l:close.lnum . 'l\%' . l:close.cnum . 'c' . l:close.re.this)
+  endif
+endfunction
+
+" }}}1
+
+endif