Source /etc/vimrc.local if it exists

There seems to be no good way to extend distro-provided vimrc. If the
user modifies /etc/vimrc, then RPM will keep it intact from then on,
with subsequent distribution updates going into a .rpmnew file. Sad.

On Debian the user is supposed to put the local overrides into a
vimrc.local file next to the main vimrc. That is pretty neat -- the
local configuration is separated from the system one and can be updated
independently. Let's do the same thing.

vim.spec

@@ -21,7 +21,7 @@ Summary: The VIM editor
 URL:     http://www.vim.org/
 Name: vim
 Version: %{baseversion}.%{patchlevel}
-Release: 1%{?dist}
+Release: 2%{?dist}
 License: Vim and MIT
 Source0: ftp://ftp.vim.org/pub/vim/unix/vim-%{baseversion}-%{patchlevel}.tar.bz2
 Source1: vim.sh
@@ -783,6 +783,9 @@ touch %{buildroot}/%{_datadir}/%{name}/vimfiles/doc/tags
 %{_datadir}/icons/locolor/*/apps/*
 
 %changelog
+* Mon Mar 16 2020 Lubomir Rintel <lkundrak@v3.sk> - 2:8.2.390-2
+- source /etc/vimrc.local if it exists
+
 * Mon Mar 16 2020 Zdenek Dohnal <zdohnal@redhat.com> - 2:8.2.390-1
 - patchlevel 390
 

vimrc

@@ -121,3 +121,8 @@ endif
 
 " Don't wake up system with blinking cursor:
 let &guicursor = &guicursor . ",a:blinkon0"
+
+" Source a global configuration file if available
+if filereadable("/etc/vimrc.local")
+  source /etc/vimrc.local
+endif