Read modelines from local files

Read modelines from files when there's a local configuration directory
and the files are under the local configuration's root

cfg/99-modelines.vim

@@ -0,0 +1,23 @@
+" When a local configuration is in use and a file is being opened under the
+" local configuration's directory, enable modelines locally. Only allow a
+" single modeline.
+
+function! <SID>CheckModelines()
+	if !exists( "g:vim_local_path" )
+		return
+	endif
+
+	let l:file_path = expand( '%:p' )
+	let l:vim_local_root = fnamemodify( g:vim_local_path , ':p:h:h' ) . '/'
+	let l:lvlr = len( l:vim_local_root )
+
+	if len( l:file_path ) <= l:lvlr
+			\ || l:file_path[0:(l:lvlr-1)] !=# l:vim_local_root
+		return
+	endif
+
+	setlocal modeline
+endfunction
+
+set modelines=1
+au BufRead * call <SID>CheckModelines()