Add deeper netrw support, including Git branch head and netrw sorting

options

autoload/airline/extensions.vim

@@ -20,7 +20,6 @@ endfunction
 let s:script_path = tolower(resolve(expand('<sfile>:p:h')))
 
 let s:filetype_overrides = {
-      \ 'netrw': [ 'netrw', '%f' ],
       \ 'nerdtree': [ 'NERD', '' ],
       \ 'gundo': [ 'Gundo', '' ],
       \ 'diff': [ 'diff', '' ],
@@ -128,6 +127,10 @@ function! airline#extensions#load()
     call airline#extensions#unite#init(s:ext)
   endif
 
+  if exists(':NetrwSettings')
+    call airline#extensions#netrw#init(s:ext)
+  endif
+
   if get(g:, 'loaded_vimfiler', 0)
     let g:vimfiler_force_overwrite_statusline = 0
   endif

autoload/airline/extensions/netrw.vim

@@ -0,0 +1,28 @@
+" MIT License. Copyright (c) 2013 Bailey Ling.
+" vim: et ts=2 sts=2 sw=2
+
+if !exists(':NetrwSettings')
+  finish
+endif
+
+function! airline#extensions#netrw#apply(...)
+  if &ft == 'netrw'
+    call a:1.add_section('airline_a', ' netrw ')
+    call a:1.add_section('airline_b', ' %{airline#extensions#branch#get_head()} ')
+    call a:1.add_section('airline_c', ' %f ')
+    call a:1.split()
+    call a:1.add_section('airline_y', ' %{airline#extensions#netrw#sortstring()} ')
+    return 1
+  endif
+endfunction
+
+function! airline#extensions#netrw#init(ext)
+  let g:netrw_force_overwrite_statusline = 0
+  call a:ext.add_statusline_func('airline#extensions#netrw#apply')
+endfunction
+
+
+function! airline#extensions#netrw#sortstring()
+  let order = (g:netrw_sort_direction =~ 'n') ? '+' : '-'
+  return g:netrw_sort_by . ' [' . order . ']'
+endfunction