extract syntastic

autoload/airline/extensions.vim

@@ -19,8 +19,6 @@ function! airline#extensions#apply_left_override(section1, section2)
 endfunction
 
 function! airline#extensions#update_external_values()
-  let g:airline_externals_syntastic = g:airline_enable_syntastic && exists('*SyntasticStatuslineFlag')
-        \ ? '%#warningmsg#%{SyntasticStatuslineFlag()}' : ''
   let g:airline_externals_branch = g:airline_enable_branch
         \ ? (exists('*fugitive#head') && strlen(fugitive#head()) > 0
           \ ? g:airline_branch_prefix.fugitive#head()
@@ -120,10 +118,14 @@ function! airline#extensions#load()
   endif
 
   if get(g:, 'command_t_loaded', 0)
-    call add(g:airline_statusline_funcrefs, function('airline#extensions#commandt#apply_window_override'))
+    call airline#extensions#commandt#init(s:ext)
   endif
 
-  if g:airline_enable_bufferline && get(g:, 'loaded_bufferline', 0)
+  if g:airline_enable_syntastic && get(g:, 'loaded_syntastic_plugin')
+    call airline#extensions#syntastic#init(s:ext)
+  endif
+
+  if g:airline_enable_bufferline && exists('*bufferline#get_status_string')
     call airline#extensions#bufferline#init(s:ext)
   endif
 

autoload/airline/extensions/bufferline.vim

@@ -14,7 +14,5 @@ function! airline#extensions#bufferline#init(ext)
   let g:bufferline_active_buffer_right = ''
   let g:bufferline_separator = ' '
 
-  if g:airline_enable_bufferline && exists('*bufferline#get_status_string')
-    call a:ext.add_statusline_funcref(function('airline#extensions#bufferline#apply'))
-  endif
+  call a:ext.add_statusline_funcref(function('airline#extensions#bufferline#apply'))
 endfunction

autoload/airline/extensions/commandt.vim

@@ -1,8 +1,12 @@
 " MIT license. Copyright (c) 2013 Bailey Ling.
 " vim: ts=2 sts=2 sw=2 fdm=indent
 
-function! airline#extensions#commandt#apply_window_override()
+function! airline#extensions#commandt#apply()
   if bufname('%') ==# 'GoToFile'
     call airline#extensions#apply_left_override('CommandT', '')
   endif
 endfunction
+
+function! airline#extensions#commandt#init(ext)
+  call ext.add_statusline_funcref(function('airline#extensions#commandt#apply'))
+endfunction

autoload/airline/extensions/syntastic.vim

@@ -0,0 +1,12 @@
+" MIT license. Copyright (c) 2013 Bailey Ling.
+" vim: ts=2 sts=2 sw=2 fdm=indent
+
+function! airline#extensions#syntastic#apply()
+  let w:airline_section_gutter = '%#warningmsg#%{SyntasticStatuslineFlag()}'
+endfunction
+
+function! airline#extensions#syntastic#init(ext)
+  if g:airline_enable_syntastic && exists('*SyntasticStatuslineFlag')
+    call a:ext.add_statusline_funcref(function('airline#extensions#syntastic#apply'))
+  endif
+endfunction

plugin/airline.vim

@@ -58,7 +58,7 @@ function! s:on_window_changed()
     call s:check_defined('g:airline_section_a', '%{g:airline_current_mode_text}')
     call s:check_defined('g:airline_section_b', '%{g:airline_externals_branch}')
     call s:check_defined('g:airline_section_c', '%f%m')
-    call s:check_defined('g:airline_section_gutter', g:airline_externals_syntastic)
+    call s:check_defined('g:airline_section_gutter', '')
     call s:check_defined('g:airline_section_x', g:airline_externals_tagbar."%{strlen(&filetype)>0?&filetype:''}")
     call s:check_defined('g:airline_section_y', "%{strlen(&fenc)>0?&fenc:''}%{strlen(&ff)>0?'['.&ff.']':''}")
     call s:check_defined('g:airline_section_z', '%3p%% '.g:airline_linecolumn_prefix.'%3l:%3c')