From d2c069b971b80f1da915f9f1f50cc1a8194d3d2c Mon Sep 17 00:00:00 2001
From: Bailey Ling <bling@live.ca>
Date: Tue, 6 Aug 2013 21:42:32 -0400
Subject: [PATCH] make syntastic use the warning section

---
 autoload/airline.vim                       |  4 ++--
 autoload/airline/extensions/syntastic.vim  | 10 +++++++---
 autoload/airline/extensions/whitespace.vim |  2 +-
 doc/airline.txt                            |  4 ++--
 4 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/autoload/airline.vim b/autoload/airline.vim
index 72d78ad4..23997af6 100644
--- a/autoload/airline.vim
+++ b/autoload/airline.vim
@@ -2,7 +2,7 @@
 " vim: ts=2 sts=2 sw=2 fdm=indent
 
 let s:is_win32term = (has('win32') || has('win64')) && !has('gui_running')
-let s:sections = ['a','b','c','gutter','x','y','z']
+let s:sections = ['a','b','c','gutter','x','y','z','warning']
 
 let s:airline_highlight_map = {
       \ 'mode'           : 'Al2',
@@ -105,7 +105,7 @@ function! s:get_statusline(winnr, active)
     let sl.=a:active ? g:airline_right_sep : g:airline_right_alt_sep
     let sl.=l:mode_color
     let sl.=s:get_section(a:winnr, 'z')
-    let sl.='%#Al3#'.s:getwinvar(a:winnr, 'airline_section_warning', '')
+    let sl.='%(%#warningmsg#'.s:getwinvar(a:winnr, 'airline_section_warning', '').'%)'
   endif
   return sl
 endfunction
diff --git a/autoload/airline/extensions/syntastic.vim b/autoload/airline/extensions/syntastic.vim
index d6b386db..85069032 100644
--- a/autoload/airline/extensions/syntastic.vim
+++ b/autoload/airline/extensions/syntastic.vim
@@ -1,8 +1,12 @@
 " MIT license. Copyright (c) 2013 Bailey Ling.
 " vim: ts=2 sts=2 sw=2 fdm=indent
 
-function! airline#extensions#syntastic#init(ext)
-  if g:airline_section_gutter == ''
-    let g:airline_section_gutter = '%#warningmsg#%{SyntasticStatuslineFlag()}'
+function! airline#extensions#syntastic#apply()
+  if exists('w:airline_active') && w:airline_active
+    let w:airline_section_warning = ' %#warningmsg#%{SyntasticStatuslineFlag()}'
   endif
 endfunction
+
+function! airline#extensions#syntastic#init(ext)
+  call a:ext.add_statusline_funcref(function('airline#extensions#syntastic#apply'))
+endfunction
diff --git a/autoload/airline/extensions/whitespace.vim b/autoload/airline/extensions/whitespace.vim
index fe842c27..0f0f751e 100644
--- a/autoload/airline/extensions/whitespace.vim
+++ b/autoload/airline/extensions/whitespace.vim
@@ -10,7 +10,7 @@ function! airline#extensions#whitespace#check()
   let mixed = search('^ ', 'nw') != 0 && search('^\t', 'nw') != 0
 
   if trailing || mixed
-    let text = " ".g:airline_whitespace_symbol." "
+    let text = g:airline_whitespace_symbol." "
     if g:airline_detect_whitespace == 1
       if trailing
         let text .= 'trailing '
diff --git a/doc/airline.txt b/doc/airline.txt
index df003e64..82e0b5f8 100644
--- a/doc/airline.txt
+++ b/doc/airline.txt
@@ -168,11 +168,11 @@ with the usual statusline syntax.
   let g:airline_section_a       (the mode/paste indicator)
   let g:airline_section_b       (the fugitive/lawrencium branch indicator)
   let g:airline_section_c       (bufferline or filename)
-  let g:airline_section_gutter  (syntastic, readonly flag)
+  let g:airline_section_gutter
   let g:airline_section_x       (tagbar, filetype)
   let g:airline_section_y       (fileencoding, fileformat)
   let g:airline_section_z       (percentage, line number, column number)
-  let g:airline_section_warning (special section that only appears sometimes)
+  let g:airline_section_warning (syntastic, whitespace)
 
   " here is an example of how you could replace the branch indicator with
   " the current working directory, followed by the filename.