Add deletion of undodir files created by git commits

vim/vimrc

@@ -2,7 +2,6 @@
 if has("autocmd")
   autocmd! bufwritepost .vimrc source ~/.vimrc
 endif
-
 if !empty(system("setxkbmap -print|grep bepo"))
 	source ~/.vimrc.bepo
 endif
@@ -35,17 +34,25 @@ set modeline
 " Maintain undo history between sessions
 set undofile
 if ($XDG_DATA_HOME != '')
-	silent !mkdir $XDG_DATA_HOME/vim/undodir -p > /dev/null 2>&1
+	silent !mkdir $XDG_DATA_HOME/vim/undodir -p > /dev/null
 	set undodir=$XDG_DATA_HOME/vim/undodir
+	if has("autocmd")
+		autocmd bufwritepost * silent ! chmod" 600 $XDG_DATA_HOME/vim/undodir/* > /dev/null && rm $XDG_DATA_HOME/vim/undodir/*\%.git\%COMMIT_EDITMSG > /dev/null
+	endif
 else
 	if ($HOME != '')
-		silent !mkdir $HOME/.local/share/vim/undodir -p > /dev/null 2>&1
+		silent !mkdir $HOME/.local/share/vim/undodir -p > /dev/null
 	set undodir=$HOME/.local/share/vim/undodir
+	if has("autocmd")
+		autocmd bufwritepost * silent ! chmod 600 $HOME/.local/share/vim/undodir/* > /dev/null && rm $HOME/.local/share/vim/undodir/*\%.git\%COMMIT_EDITMSG  > /dev/null
+	endif
 	else
 		echo "Error: environment variable $HOME not set"
 	endif
 endif
-if &term =~ "xterm\\|rxvt"
+
+if has("autocmd")
+	if &term =~ "xterm\\|rxvt"
 		" use an orange cursor in insert mode
 		let &t_SI = "\<Esc>]12;orange\x7"
 		" use a red cursor otherwise
@@ -54,6 +61,7 @@ if &term =~ "xterm\\|rxvt"
 		" reset cursor when vim exits
 		autocmd VimLeave * silent !echo -ne "\033]112\007"
 		" use \003]12;gray\007 for gnome-terminal and rxvt up to version 9.21
+	endif
 endif
 
 " Colorise les nbsp
@@ -61,4 +69,3 @@ colorscheme koehler
 highlight NbSp ctermbg=lightgray guibg=lightred
 match NbSp /\%xa0/
 
-