From f14965af391b2f89ce26369eec3e333c98fbcdde Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Mon, 3 Apr 2023 17:24:51 +1200
Subject: If OptionSet is available, trigger on 'spelllang'

We have to switch from <afile> to simply expanding % here, because
<afile> doesn't expand to the buffer's filename when OptionSet fires.
---
 autoload/spellfile_local.vim | 2 +-
 plugin/spellfile_local.vim   | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/autoload/spellfile_local.vim b/autoload/spellfile_local.vim
index 177503f..7573c45 100644
--- a/autoload/spellfile_local.vim
+++ b/autoload/spellfile_local.vim
@@ -23,7 +23,7 @@ function! spellfile_local#() abort
   " filetype.lang.encoding.add.
   "
   let basenames = [s:Filename([lang, encoding, 'add'])]
-  let path = expand('<afile>:p')
+  let path = expand('%:p')
   call add(
         \ basenames,
         \ s:Filename(['path', path, lang, encoding, 'add'])
diff --git a/plugin/spellfile_local.vim b/plugin/spellfile_local.vim
index 623b148..5e348c0 100644
--- a/plugin/spellfile_local.vim
+++ b/plugin/spellfile_local.vim
@@ -17,4 +17,8 @@ let loaded_spellfile_local = 1
 augroup spellfile_local
   autocmd BufFilePost,BufNewFile,BufRead,EncodingChanged,FileType *
         \ call spellfile_local#()
+  if has('##OptionSet')
+    autocmd OptionSet spelllang
+          \ call spellfile_local#()
+  endif
 augroup END
-- 
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