[nginx] Contrib: vim syntax adjusted to save cpoptions (ticket #2276).

[Maxim Dounin]

details:   https://hg.nginx.org/nginx/rev/5d88e2bf92b3
branches:  
changeset: 7996:5d88e2bf92b3
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Sat Jan 22 00:28:51 2022 +0300
description:
Contrib: vim syntax adjusted to save cpoptions (ticket #2276).

Line continuation as used in the syntax file might be broken if "compatible"
is set or "C" is added to cpoptions.  Fix is to set the "cpoptions" option
to vim default value at script start and restore it later, see
":help use-cpo-save".

diffstat:

 contrib/vim/syntax/nginx.vim |  6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diffs (21 lines):

diff -r 7752d8523066 -r 5d88e2bf92b3 contrib/vim/syntax/nginx.vim
--- a/contrib/vim/syntax/nginx.vim	Wed Jan 19 17:37:34 2022 -0800
+++ b/contrib/vim/syntax/nginx.vim	Sat Jan 22 00:28:51 2022 +0300
@@ -5,6 +5,9 @@ if exists("b:current_syntax")
   finish
 end
 
+let s:save_cpo = &cpo
+set cpo&vim
+
 " general syntax
 
 if has("patch-7.4.1142")
@@ -2485,4 +2488,7 @@ hi def link ngxDirectiveThirdPartyDeprec
 hi def link ngxListenOptions Keyword
 hi def link ngxListenOptionsDeprecated Error
 
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
 let b:current_syntax = "nginx"