From f408603f4fc10ef2ff2dd3b6550365109b0b6214 Mon Sep 17 00:00:00 2001
From: Christian Clason <c.clason@uni-graz.at>
Date: Sun, 15 Sep 2024 19:32:19 +0200
Subject: [PATCH] vim-patch:9.1.0731: inconsistent case sensitive extension
 matching

Problem:  inconsistent case sensitive extension matching
Solution: unify case sensitive extension matching (Evgeni Chasnovski).

There are different approaches of how extensions are matched with
respect to case sensitivity. In particular, '\c' flag is used in pattern
whereas in most places case sensitive matching is guarded behind
`has("fname_case")` condition.

Replace all instances of '\c' with an explicit case sensitive pattern
variants guarded by `has("fname_case")`. Strictly speaking, this is a
breaking change because only two (most common and prevailingly tested)
variants are now matched: upper first letter and upper all letters.

closes: vim/vim#15672

https://github.com/vim/vim/commit/59b089c9df238ce940b3c593295bc511e201399a

Co-authored-by: Evgeni Chasnovski <evgeni.chasnovski@gmail.com>
---
 runtime/lua/vim/filetype.lua       | 40 ------------------------------
 test/old/testdir/test_filetype.vim | 15 ++++++-----
 2 files changed, 7 insertions(+), 48 deletions(-)

diff --git a/runtime/lua/vim/filetype.lua b/runtime/lua/vim/filetype.lua
index a287607386..bfe700f8dd 100644
--- a/runtime/lua/vim/filetype.lua
+++ b/runtime/lua/vim/filetype.lua
@@ -280,12 +280,7 @@ local extension = {
   cfi = 'cf',
   hgrc = 'cfg',
   cfg = detect.cfg,
-  cfG = detect.cfg,
-  cFg = detect.cfg,
-  cFG = detect.cfg,
   Cfg = detect.cfg,
-  CfG = detect.cfg,
-  CFg = detect.cfg,
   CFG = detect.cfg,
   chf = 'ch',
   chai = 'chaiscript',
@@ -370,12 +365,7 @@ local extension = {
   drt = 'dart',
   ds = 'datascript',
   dat = detect.dat,
-  daT = detect.dat,
-  dAt = detect.dat,
-  dAT = detect.dat,
   Dat = detect.dat,
-  DaT = detect.dat,
-  DAt = detect.dat,
   DAT = detect.dat,
   dcd = 'dcd',
   decl = detect.decl,
@@ -658,12 +648,7 @@ local extension = {
   kt = 'kotlin',
   ktm = 'kotlin',
   sub = 'krl',
-  suB = 'krl',
-  sUb = 'krl',
-  sUB = 'krl',
   Sub = 'krl',
-  SuB = 'krl',
-  SUb = 'krl',
   SUB = 'krl',
   ks = 'kscript',
   k = 'kwt',
@@ -699,12 +684,7 @@ local extension = {
   lite = 'lite',
   livemd = 'livebook',
   log = detect.log,
-  loG = detect.log,
-  lOg = detect.log,
-  lOG = detect.log,
   Log = detect.log,
-  LoG = detect.log,
-  LOg = detect.log,
   LOG = detect.log,
   lgt = 'logtalk',
   lotos = 'lotos',
@@ -773,12 +753,7 @@ local extension = {
   mmp = 'mmp',
   mms = detect.mms,
   mod = detect.mod,
-  moD = detect.mod,
-  mOd = detect.mod,
-  mOD = detect.mod,
   Mod = detect.mod,
-  MoD = detect.mod,
-  MOd = detect.mod,
   MOD = detect.mod,
   DEF = 'modula2',
   m3 = 'modula3',
@@ -948,12 +923,7 @@ local extension = {
   ih = 'ppwiz',
   action = 'privoxy',
   prg = detect.prg,
-  prG = detect.prg,
-  pRg = detect.prg,
-  pRG = detect.prg,
   Prg = detect.prg,
-  PrG = detect.prg,
-  PRg = detect.prg,
   PRG = detect.prg,
   pc = 'proc',
   pdb = 'prolog',
@@ -1133,12 +1103,7 @@ local extension = {
   sqr = 'sqr',
   nut = 'squirrel',
   src = detect.src,
-  srC = detect.src,
-  sRc = detect.src,
-  sRC = detect.src,
   Src = detect.src,
-  SrC = detect.src,
-  SRc = detect.src,
   SRC = detect.src,
   s28 = 'srec',
   s37 = 'srec',
@@ -1168,12 +1133,7 @@ local extension = {
   swig = 'swig',
   swg = 'swig',
   sys = detect.sys,
-  syS = detect.sys,
-  sYs = detect.sys,
-  sYS = detect.sys,
   Sys = detect.sys,
-  SyS = detect.sys,
-  SYs = detect.sys,
   SYS = detect.sys,
   svh = 'systemverilog',
   sv = 'systemverilog',
diff --git a/test/old/testdir/test_filetype.vim b/test/old/testdir/test_filetype.vim
index 9c47dfa16f..33f8df4081 100644
--- a/test/old/testdir/test_filetype.vim
+++ b/test/old/testdir/test_filetype.vim
@@ -1150,15 +1150,14 @@ func Test_cfg_file()
   unlet g:filetype_cfg
 
   " RAPID cfg
-  let ext = 'cfg'
   for i in ['EIO', 'MMC', 'MOC', 'PROC', 'SIO', 'SYS']
-    call writefile([i .. ':CFG'], 'cfgfile.' .. ext)
-    execute "split cfgfile." .. ext
-    call assert_equal('rapid', &filetype)
-    bwipe!
-    call delete('cfgfile.' .. ext)
-    " check different case of file extension
-    let ext = substitute(ext, '\(\l\)', '\u\1', '')
+    for ext in ['cfg', 'Cfg', 'CFG']
+      call writefile([i .. ':CFG'], 'cfgfile.' .. ext)
+      execute "split cfgfile." .. ext
+      call assert_equal('rapid', &filetype)
+      bwipe!
+      call delete('cfgfile.' .. ext)
+    endfor
   endfor
 
   " clean up