From 53b856b0c5f159f65c512621a7539fd0a37d7546 Mon Sep 17 00:00:00 2001
From: Bailey Ling <bling@live.ca>
Date: Sat, 24 Aug 2013 03:43:55 +0000
Subject: [PATCH] inactivate existing statusline without building a new one.

---
 autoload/airline.vim         | 14 ++++++++------
 autoload/airline/builder.vim |  6 +-----
 2 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/autoload/airline.vim b/autoload/airline.vim
index 29a9d01..907093c 100644
--- a/autoload/airline.vim
+++ b/autoload/airline.vim
@@ -94,10 +94,12 @@ endfunction
 
 function! airline#update_statusline()
   for nr in filter(range(1, winnr('$')), 'v:val != winnr()')
-    call setwinvar(nr, 'airline_active', 0)
-    let context = { 'winnr': nr, 'active': 0 }
-    let builder = airline#builder#new(context, s:highlighter)
-    call setwinvar(nr, '&statusline', airline#get_statusline(builder, nr, 0))
+    if airline#util#getwinvar(nr, 'airline_active', 0)
+      call setwinvar(nr, 'airline_active', 0)
+      let stl = getwinvar(nr, '&statusline')
+      let line = substitute(stl, '%#.\{-}\ze#', '\0_inactive', 'g')
+      call setwinvar(nr, '&statusline', line)
+    endif
   endfor
 
   let w:airline_active = 1
@@ -109,8 +111,8 @@ function! airline#update_statusline()
   endfor
 
   let context = { 'winnr': winnr(), 'active': 1 }
-  let builder = airline#builder#new(context, s:highlighter)
-  let err = airline#util#exec_funcrefs(g:airline_statusline_funcrefs, builder)
+  let builder = airline#builder#new(s:highlighter)
+  let err = airline#util#exec_funcrefs(g:airline_statusline_funcrefs, builder, context)
   if err == 0
     call setwinvar(winnr(), '&statusline', airline#get_statusline(builder, winnr(), 1))
   elseif err == 1
diff --git a/autoload/airline/builder.vim b/autoload/airline/builder.vim
index 04467a6..87da340 100644
--- a/autoload/airline/builder.vim
+++ b/autoload/airline/builder.vim
@@ -24,15 +24,11 @@ function! s:prototype.add_raw(text)
 endfunction
 
 function! s:prototype.build()
-  if !self._context.active
-    let self._line = substitute(self._line, '%#.\{-}\ze#', '\0_inactive', 'g')
-  endif
   return self._line
 endfunction
 
-function! airline#builder#new(context, highlighter)
+function! airline#builder#new(highlighter)
   let builder = copy(s:prototype)
-  let builder._context = a:context
   let builder._highlighter = a:highlighter
   let builder._side = 1
   let builder._curgroup = ''