From bed11010baaf670e2c1688c166876ab4ee092129 Mon Sep 17 00:00:00 2001
From: Bailey Ling <bling@live.ca>
Date: Tue, 10 Sep 2013 01:34:35 +0000
Subject: [PATCH] make the separator optional for older vim versions. resolves
 #239.

---
 autoload/airline/extensions/default.vim | 34 +++++++++++++++++--------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/autoload/airline/extensions/default.vim b/autoload/airline/extensions/default.vim
index db3384a5..a3e0c580 100644
--- a/autoload/airline/extensions/default.vim
+++ b/autoload/airline/extensions/default.vim
@@ -28,19 +28,33 @@ function! s:build_sections(builder, context, keys)
     if key == 'warning' && !a:context.active
       continue
     endif
-
-    " i have no idea why the warning section needs special treatment, but it's
-    " needed to prevent separators from showing up
-    if key == 'warning'
-      call a:builder.add_raw('%(')
-    endif
-    call a:builder.add_section('airline_'.key, s:get_section(a:context.winnr, key))
-    if key == 'warning'
-      call a:builder.add_raw('%)')
-    endif
+    call s:add_section(a:builder, a:context, key)
   endfor
 endfunction
 
+if v:version >= 704 || (v:version >= 703 && has('patch81'))
+  function s:add_section(builder, context, key)
+    " i have no idea why the warning section needs special treatment, but it's
+    " needed to prevent separators from showing up
+    if a:key == 'warning'
+      call a:builder.add_raw('%(')
+    endif
+    call a:builder.add_section('airline_'.a:key, s:get_section(a:context.winnr, a:key))
+    if a:key == 'warning'
+      call a:builder.add_raw('%)')
+    endif
+  endfunction
+else
+  " older version don't like the use of %(%)
+  function s:add_section(builder, context, key)
+    if a:key == 'warning'
+      call a:builder.add_raw('%#airline_warning#'.s:get_section(a:context.winnr, a:key))
+    else
+      call a:builder.add_section('airline_'.a:key, s:get_section(a:context.winnr, a:key))
+    endif
+  endfunction
+endif
+
 function! airline#extensions#default#apply(builder, context)
   let winnr = a:context.winnr
   let active = a:context.active