extensions: Group output of :AirlineExtension by loaded/not-loaded

Signed-off-by: Christian Brabandt <cb@256bit.org>

plugin/airline.vim

@@ -272,14 +272,23 @@ function! s:airline_extensions()
   echo printf("%-15s\t%s\t%s", "Extension", "Extern", "Status")
   echohl Normal
   let set=[]
+  let not_loaded=[]
   for ext in sort(files)
-    if index(set, ext) > -1
+    " prevent duplicates
+    if index(set + not_loaded, ext) > -1
       continue
     endif
     let indx=match(loaded, '^'.ext.'\*\?$')
-    let external = (indx > -1 && loaded[indx] =~ '\*$')
-    echo printf("%-15s\t%s\t%sloaded", ext, external, indx == -1 ? 'not ' : '')
+    if indx == -1
+      call add(not_loaded, ext)
+      continue
+    endif
     call add(set, ext)
+    let external=(loaded[indx] =~ '\*$')
+    echo printf("%-15s\t%s\tloaded", ext, external)
+  endfor
+  for ext in not_loaded
+    echo printf("%-15s\t%s\tnot loaded", ext, 0)
   endfor
 endfunction