From 41179a6bc125303d917c78bdc806983ccc5f287f Mon Sep 17 00:00:00 2001
From: Eisuke Kawashima <e-kwsm@users.noreply.github.com>
Date: Sat, 31 May 2025 01:34:50 +0900
Subject: vim-patch:9.1.1342: Shebang filetype detection can be improved

Problem:  Shebang filetype detection can be improved
Solution: Improve detection logic (Eisuke Kawashima)

Vim does not correctly detect filetype from
  - `#!/usr/bin/env --split-string=awk -f`
  - `#!/usr/bin/env -S -i awk -f`
  - `#!/usr/bin/env -S VAR= awk -f`
So update the current detection logic to detect those cases.

closes: vim/vim#17199

https://github.com/vim/vim/commit/f102f4c2e80f5493a02a7b1130f11615d60b6295

Co-authored-by: Eisuke Kawashima <e-kwsm@users.noreply.github.com>
---
 runtime/lua/vim/filetype/detect.lua | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

(limited to 'runtime/lua')

diff --git a/runtime/lua/vim/filetype/detect.lua b/runtime/lua/vim/filetype/detect.lua
index 6e1f833424..c78945ef04 100644
--- a/runtime/lua/vim/filetype/detect.lua
+++ b/runtime/lua/vim/filetype/detect.lua
@@ -1959,11 +1959,10 @@ local function match_from_hashbang(contents, path, dispatch_extension)
   -- "#!/usr/bin/bash" to make matching easier.
   -- Recognize only a few {options} that are commonly used.
   if matchregex(first_line, [[^#!\s*\S*\<env\s]]) then
-    first_line = first_line:gsub('%S+=%S+', '')
-    first_line = first_line
-      :gsub('%-%-ignore%-environment', '', 1)
-      :gsub('%-%-split%-string', '', 1)
-      :gsub('%-[iS]', '', 1)
+    first_line = fn.substitute(first_line, [[\s\zs--split-string\(\s\|=\)]], '', '')
+    first_line = fn.substitute(first_line, [[\s\zs[A-Za-z0-9_]\+=\S*\ze\s]], '', 'g')
+    first_line =
+      fn.substitute(first_line, [[\s\zs\%(-[iS]\+\|--ignore-environment\)\ze\s]], '', 'g')
     first_line = fn.substitute(first_line, [[\<env\s\+]], '', '')
   end
 
-- 
cgit