From 136c11ca22881ac64c074070c7fda501e89b6bea Mon Sep 17 00:00:00 2001
From: Christian Clason <c.clason@uni-graz.at>
Date: Tue, 9 Jul 2024 19:15:22 +0200
Subject: [PATCH] vim-patch:9.1.0550: filetype: antlr4 files are not recognized

Problem:  filetype: antlr4 files are not recognized
Solution: Detect '*.g4' as antlr4 filetype, include a simple antlr4
          syntax and filetype plugin (Yinzuo Jiang)

closes: vim/vim#15191

https://github.com/vim/vim/commit/4a7a4a3675b6ad90a525524ba4684925df212325

Co-authored-by: Yinzuo Jiang <jiangyinzuo@foxmail.com>
---
 runtime/ftplugin/antlr4.vim  | 14 ++++++++++++++
 runtime/lua/vim/filetype.lua |  1 +
 runtime/syntax/antlr4.vim    | 30 ++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+)
 create mode 100644 runtime/ftplugin/antlr4.vim
 create mode 100644 runtime/syntax/antlr4.vim

diff --git a/runtime/ftplugin/antlr4.vim b/runtime/ftplugin/antlr4.vim
new file mode 100644
index 0000000000..610d5284fb
--- /dev/null
+++ b/runtime/ftplugin/antlr4.vim
@@ -0,0 +1,14 @@
+" Vim filetype plugin
+" Language:	ANTLR4, ANother Tool for Language Recognition v4 <www.antlr.org>
+" Maintainer:	Yinzuo Jiang <jiangyinzuo@foxmail.com>
+" Last Change:	2024 July 09
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setlocal comments=sO:*\ -,mO:*\ \ ,exO:*/,s1:/*,mb:*,ex:*/,://
+setlocal commentstring=//\ %s
+
+let b:undo_ftplugin = 'setl com< cms<'
diff --git a/runtime/lua/vim/filetype.lua b/runtime/lua/vim/filetype.lua
index 18fa1ed658..83892ac290 100644
--- a/runtime/lua/vim/filetype.lua
+++ b/runtime/lua/vim/filetype.lua
@@ -190,6 +190,7 @@ local extension = {
   aidl = 'aidl',
   aml = 'aml',
   run = 'ampl',
+  g4 = 'antlr4',
   scpt = 'applescript',
   ino = 'arduino',
   pde = 'arduino',
diff --git a/runtime/syntax/antlr4.vim b/runtime/syntax/antlr4.vim
new file mode 100644
index 0000000000..33cc865ccc
--- /dev/null
+++ b/runtime/syntax/antlr4.vim
@@ -0,0 +1,30 @@
+" Vim syntax file
+" Language:	ANTLR4, ANother Tool for Language Recognition v4 <www.antlr.org>
+" Maintainer:	Yinzuo Jiang <jiangyinzuo@foxmail.com>
+" Last Change:	2024 July 09
+
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
+  finish
+endif
+
+" Keywords. See https://github.com/antlr/antlr4/blob/4.13.1/doc/lexicon.md
+syn keyword antlr4Include import
+" https://github.com/antlr/antlr4/blob/4.13.1/doc/options.md
+" https://github.com/antlr/antlr4/blob/4.13.1/doc/grammars.md
+syn keyword antlr4Structure fragment lexer parser grammar options channels tokens mode
+syn keyword antlr4Statement returns locals
+syn keyword antlr4Exceptions throws catch finally
+
+" Comments.
+syn keyword antlr4Todo contained TODO FIXME XXX NOTE
+syn region antlr4Comment start="//"  end="$"   contains=antlr4Todo,@Spell
+syn region antlr4Comment start="/\*" end="\*/" contains=antlr4Todo,@Spell
+
+hi def link antlr4Include Include
+hi def link antlr4Structure Structure
+hi def link antlr4Statement Statement
+hi def link antlr4Exceptions Structure
+hi def link antlr4Comment Comment
+
+let b:current_syntax = "antlr4"