Support for neomake

Added support for neomake plugin; similar to syntastic.
Shows warning and error counts in the airline statusbar.

autoload/airline/extensions.vim

@@ -216,6 +216,10 @@ function! airline#extensions#load()
     call airline#extensions#whitespace#init(s:ext)
   endif
 
+  if (get(g:, 'airline#extensions#neomake#enabled', 1) && exists(':Neomake'))
+    call airline#extensions#neomake#init(s:ext)
+  endif
+
   if get(g:, 'airline#extensions#po#enabled', 1) && executable('msgfmt')
     call airline#extensions#po#init(s:ext)
   endif

autoload/airline/extensions/neomake.vim

@@ -0,0 +1,25 @@
+" vim: et ts=2 sts=2 sw=2
+
+if !exists(':Neomake')
+  finish
+endif
+
+let s:error_symbol = get(g:, 'airline#extensions#neomake#error_symbol', 'E:')
+let s:warning_symbol = get(g:, 'airline#extensions#neomake#warning_symbol', 'W:')
+
+function! airline#extensions#neomake#get_warnings()
+  let counts = neomake#statusline#LoclistCounts()
+  let warnings = get(counts, 'W', 0)
+  return warnings ? s:warning_symbol.warnings : ''
+endfunction
+
+function! airline#extensions#neomake#get_errors()
+  let counts = neomake#statusline#LoclistCounts()
+  let errors = get(counts, 'E', 0)
+  return errors ? s:error_symbol.errors : ''
+endfunction
+
+function! airline#extensions#neomake#init(ext)
+  call airline#parts#define_function('neomake_warning_count', 'airline#extensions#neomake#get_warnings')
+  call airline#parts#define_function('neomake_error_count', 'airline#extensions#neomake#get_errors')
+endfunction

autoload/airline/init.vim

@@ -96,7 +96,8 @@ function! airline#init#bootstrap()
         \ 'accent': 'bold'})
   call airline#parts#define_function('ffenc', 'airline#parts#ffenc')
   call airline#parts#define_empty(['hunks', 'branch', 'obsession', 'tagbar', 'syntastic',
-        \ 'eclim', 'whitespace','windowswap', 'ycm_error_count', 'ycm_warning_count'])
+        \ 'eclim', 'whitespace','windowswap', 'ycm_error_count', 'ycm_warning_count',
+        \ 'neomake_error_count', 'neomake_warning_count'])
   call airline#parts#define_text('capslock', '')
 
   unlet g:airline#init#bootstrapping
@@ -140,10 +141,10 @@ function! airline#init#sections()
     endif
   endif
   if !exists('g:airline_section_error')
-    let g:airline_section_error = airline#section#create(['ycm_error_count', 'syntastic', 'eclim'])
+    let g:airline_section_error = airline#section#create(['ycm_error_count', 'syntastic', 'eclim', 'neomake_error_count'])
   endif
   if !exists('g:airline_section_warning')
-    let g:airline_section_warning = airline#section#create(['ycm_warning_count', 'whitespace'])
+    let g:airline_section_warning = airline#section#create(['ycm_warning_count',  'neomake_warning_count', 'whitespace'])
   endif
 endfunction