From 7c6517649993237dabb8dfa9dbab49ce44ac2b9c Mon Sep 17 00:00:00 2001
From: Daniel Hahler <git@thequod.de>
Date: Thu, 28 Aug 2014 00:16:26 +0200
Subject: [PATCH] Add `readonly` indicator also for !&modifiable

While typically both are set (e.g. with `:help`), I am using the
modifiable setting alone to prevent editing of some files via an
autocommand (`*.css`, if `*.scss` exists).

I can also set `readonly` for this buffer, but that gets reset when
reloading the buffer, which is not the case for `modifiable`.
---
 autoload/airline.vim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/autoload/airline.vim b/autoload/airline.vim
index b4a88817..81cf3b5f 100644
--- a/autoload/airline.vim
+++ b/autoload/airline.vim
@@ -156,7 +156,7 @@ function! airline#check_mode(winnr)
     call add(l:mode, 'paste')
   endif
 
-  if &readonly
+  if &readonly || ! &modifiable
     call add(l:mode, 'readonly')
   endif