vim-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: vim/vim#19260

d0fa375629

Co-authored-by: DuckAfire <155199080+duckafire@users.noreply.github.com>

runtime/lua/vim/filetype.lua

@@ -446,6 +446,7 @@ local extension = {
   lc = 'elsa',
   elv = 'elvish',
   ent = detect.ent,
+  env = 'env',
   epp = 'epuppet',
   erl = 'erlang',
   hrl = 'erlang',
@@ -1151,7 +1152,6 @@ local extension = {
   cygport = detect.bash,
   ebuild = detect.bash,
   eclass = detect.bash,
-  env = detect.sh,
   envrc = detect.sh,
   ksh = detect.ksh,
   sh = detect.sh,
@@ -1627,6 +1627,7 @@ local filename = {
   Earthfile = 'earthfile',
   ['.editorconfig'] = 'editorconfig',
   ['elinks.conf'] = 'elinks',
+  ['.env'] = 'env',
   ['rebar.config'] = 'erlang',
   ['mix.lock'] = 'elixir',
   ['filter-rules'] = 'elmfilt',
@@ -2652,11 +2653,13 @@ local pattern = {
     ['^%.cshrc'] = detect.csh,
     ['^%.login'] = detect.csh,
     ['^%.notmuch%-config%.'] = 'dosini',
+    ['^%.env%.'] = 'env',
     ['^%.gitsendemail%.msg%.......$'] = 'gitsendemail',
     ['^%.kshrc'] = detect.ksh,
     ['^%.article%.%d+$'] = 'mail',
     ['^%.letter%.%d+$'] = 'mail',
     ['^%.reminders'] = starsetf('remind'),
+    ['^%.envrc%.'] = detect.sh,
     ['^%.tcshrc'] = detect.tcsh,
     ['^%.zcompdump'] = starsetf('zsh'),
   },

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"
+

test/old/testdir/test_filetype.vim

@@ -278,6 +278,7 @@ func s:GetFilenameChecks() abort
     \ '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'],
@@ -732,7 +733,7 @@ func s:GetFilenameChecks() abort
     \ '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'],