From cf44121f7fb6f55a22e644a1e5e1f1dc6b90c27a Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Sun, 25 Aug 2024 06:07:43 +0800
Subject: vim-patch:9.1.0694: matchparen is slow on a long line (#30134)

Problem:  The matchparen plugin is slow on a long line.
Solution: Don't use a regexp to get char at and before cursor.
          (zeertzjq)

Example:

```vim
  call setline(1, repeat(' foobar', 100000))
  runtime plugin/matchparen.vim
  normal! $hhhhhhhh
```

closes: vim/vim#15568

https://github.com/vim/vim/commit/81e7513c86459c40676bd983f73c2722096d67a9
---
 runtime/plugin/matchparen.vim | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

(limited to 'runtime/plugin')

diff --git a/runtime/plugin/matchparen.vim b/runtime/plugin/matchparen.vim
index 6c061c9fb8..2899612dce 100644
--- a/runtime/plugin/matchparen.vim
+++ b/runtime/plugin/matchparen.vim
@@ -60,12 +60,8 @@ func s:Highlight_Matching_Pair()
   let before = 0
 
   let text = getline(c_lnum)
-  let matches = matchlist(text, '\(.\)\=\%'.c_col.'c\(.\=\)')
-  if empty(matches)
-    let [c_before, c] = ['', '']
-  else
-    let [c_before, c] = matches[1:2]
-  endif
+  let c_before = text->strpart(0, c_col - 1)->slice(-1)
+  let c = text->strpart(c_col - 1)->slice(0, 1)
   let plist = split(&matchpairs, '.\zs[:,]')
   let i = index(plist, c)
   if i < 0
-- 
cgit