Merge pull request #161 from itchyny/readonly_symbol

readonly mark is now a member of extensions

autoload/airline.vim

@@ -52,8 +52,7 @@ function! airline#get_statusline(winnr, active)
     call builder.add_section('airline_a', s:get_section(a:winnr, 'a')
           \ .'%{g:airline_detect_paste && &paste ? g:airline_paste_symbol." " : ""}')
     call builder.add_section('airline_b', s:get_section(a:winnr, 'b'))
-    call builder.add_section('airline_c', '%<'.s:get_section(a:winnr, 'c')
-          \ .' %#airline_file#%{&ro ? g:airline_readonly_symbol : ""}')
+    call builder.add_section('airline_c', '%<'.s:get_section(a:winnr, 'c'))
   else
     call builder.add_section('airline_c', '%f%m')
   endif

autoload/airline/extensions.vim

@@ -167,6 +167,10 @@ function! airline#extensions#load()
     call airline#extensions#whitespace#init()
   endif
 
+  if get(g:, 'airline#extensions#readonly#enabled', 1)
+    call airline#extensions#readonly#init()
+  endif
+
   if g:airline_detect_iminsert
     call airline#extensions#iminsert#init()
   endif

autoload/airline/extensions/readonly.vim

@@ -0,0 +1,11 @@
+" MIT License. Copyright (c) 2013 Bailey Ling.
+" vim: et ts=2 sts=2 sw=2
+
+function! airline#extensions#readonly#get_mark()
+  return &ro ? g:airline_readonly_symbol : ''
+endfunction
+
+function! airline#extensions#readonly#init()
+  let g:airline_section_c .= '%{airline#extensions#readonly#get_mark()}'
+endfunction
+