patch 9.2.0033: filetype: sh filetype used for env files

Problem:  filetype: sh filetype used for env files
Solution: Detect *.env and .env.* files as env filetype,
          detect .envrc and .envrc.* as sh filetype,
          include a simple env syntax script (DuckAfire)

Previously, .env files were handled by the shell syntax. While
functional, this limited the ability to support specific .env
implementations, such as CodeIgniter4 which allows dots in keys
(e.g., "foo.bar=0").

The new dedicated 'env' filetype and syntax script improves legibility
and prevents highlighting from breaking when encountering spaces.
Currently, the syntax does not support indentation; fields, variables,
and comments must start at the beginning of the line.

closes: #19260

Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: DuckAfire <155199080+duckafire@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/filetype.vim

@@ -1027,7 +1027,7 @@ au BufNewFile,BufRead *.decl,*.dcl,*.dec
 " NOTE: Patterns ending in a star are further down, these have lower priority.
 au BufNewFile,BufRead .bashrc,bashrc,bash.bashrc,.bash[_-]profile,.bash[_-]logout,.bash[_-]aliases,.bash[_-]history,bash-fc[-.],*.ebuild,*.bash,*.eclass,PKGBUILD,*.bats,*.cygport call dist#ft#SetFileTypeSH("bash")
 au BufNewFile,BufRead .kshrc,*.ksh call dist#ft#SetFileTypeSH("ksh")
-au BufNewFile,BufRead */etc/profile,.profile,*.sh,*.env{rc,} call dist#ft#SetFileTypeSH(getline(1))
+au BufNewFile,BufRead */etc/profile,.profile,*.sh,*.envrc,.envrc.* call dist#ft#SetFileTypeSH(getline(1))
 " Shell script (Arch Linux) or PHP file (Drupal)
 au BufNewFile,BufRead *.install
 	\ if getline(1) =~ '<?php' |
@@ -1410,6 +1410,9 @@ au BufNewFile,BufRead drac.*			call s:StarSetf('dracula')
 " Execline (s6) scripts
 au BufNewFile,BufRead s6-*			call s:StarSetf('execline')
 
+" Env
+au BufNewFile,BufRead *.env,.env{.*,} setf env
+
 " Fvwm
 au BufNewFile,BufRead */.fvwm/*			call s:StarSetf('fvwm')
 au BufNewFile,BufRead *fvwmrc*,*fvwm95*.hook

runtime/syntax/env.vim

@@ -0,0 +1,28 @@
+" Vim syntax file
+" Language:    env
+" Maintainer:  DuckAfire <duckafire@gmail.com>
+" Last Change: 2026 Jan 27
+" Version:     2
+" Changelog:
+" 0. Create syntax file.
+" 1. Remove unused variable (g:main_syntax).
+" 2. Apply changes required by github@dkearns
+
+if exists("b:current_syntax")
+  finish
+endif
+
+syn match   envField   nextgroup=envValue         /^\h\%(\w\|\.\)*/
+syn region  envValue   matchgroup=Operator        start=/=/ end=/$/
+syn match   envComment contains=envTodo,envTitles /^#.*$/
+syn keyword envTodo    contained                  CAUTION NOTE TODO WARN WARNING
+syn match   envTitle   contained                  /^\s*#\s*\zs[A-Z0-9][A-Z0-9 ]*:/
+
+hi def link envField   Identifier
+hi def link envValue   String
+hi def link envComment Comment
+hi def link envTodo    Todo
+hi def link envTitle   PreProc
+
+let b:current_syntax = "env"
+

src/testdir/test_filetype.vim

@@ -278,6 +278,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     elmfilt: ['filter-rules'],
     elsa: ['file.lc'],
     elvish: ['file.elv'],
+    env: ['.env', '.env.file', 'file.env'],
     epuppet: ['file.epp'],
     erlang: ['file.erl', 'file.hrl', 'file.yaws', 'file.app.src', 'rebar.config'],
     eruby: ['file.erb', 'file.rhtml'],
@@ -735,7 +736,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     sh: ['.bashrc', '.bash_profile', '.bash-profile', '.bash_logout', '.bash-logout', '.bash_aliases', '.bash-aliases', '.bash_history', '.bash-history',
          '/tmp/bash-fc-3Ozjlw', '/tmp/bash-fc.3Ozjlw', 'PKGBUILD', 'file.bash', '/usr/share/doc/bash-completion/filter.sh',
          '/etc/udev/cdsymlinks.conf', 'any/etc/udev/cdsymlinks.conf', 'file.bats', '.ash_history', 'any/etc/neofetch/config.conf', '.xprofile',
-         'user-dirs.defaults', 'user-dirs.dirs', 'makepkg.conf', '.makepkg.conf', 'file.mdd', 'file.cygport', '.env', '.envrc', 'devscripts.conf',
+         'user-dirs.defaults', 'user-dirs.dirs', 'makepkg.conf', '.makepkg.conf', 'file.mdd', 'file.cygport', '.envrc', '.envrc.file', 'file.envrc', 'devscripts.conf',
          '.devscripts', 'file.lo', 'file.la', 'file.lai'],
     shaderslang: ['file.slang'],
     sieve: ['file.siv', 'file.sieve'],

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    33,
 /**/
     32,
 /**/