convert iminsert into a fragment.

autoload/airline/extensions.vim

@@ -199,10 +199,6 @@ function! airline#extensions#load()
     call airline#extensions#readonly#init()
   endif
 
-  if get(g:, 'airline#extensions#iminsert#enabled', 0) || get(g:, 'airline_detect_iminsert', 0)
-    call airline#extensions#iminsert#init()
-  endif
-
   " load all other extensions not part of the default distribution
   for file in split(globpath(&rtp, "autoload/airline/extensions/*.vim"), "\n")
     " check to see that both the resolved and unresolved paths do not match

autoload/airline/extensions/iminsert.vim

@@ -1,14 +0,0 @@
-" MIT License. Copyright (c) 2013 Bailey Ling.
-" vim: et ts=2 sts=2 sw=2
-
-function! airline#extensions#iminsert#get_text()
-  if &iminsert
-    return toupper(get(b:, 'keymap_name', 'lang'))
-  endif
-  return ''
-endfunction
-
-function! airline#extensions#iminsert#init()
-  let g:airline_section_a .= ' '.g:airline_left_alt_sep.' %{airline#extensions#iminsert#get_text()}'
-endfunction
-

autoload/airline/fragments.vim

@@ -7,6 +7,13 @@ call extend(g:airline#fragments#symbols, {
       \ }, 'keep')
 
 function! airline#fragments#get_paste()
-  return &paste ? '  ' . g:airline#fragments#symbols.paste : ''
+  return g:airline_detect_paste && &paste ? '  '.g:airline#fragments#symbols.paste : ''
+endfunction
+
+function! airline#fragments#get_iminsert()
+  if g:airline_detect_iminsert && &iminsert && exists('b:keymap_name')
+    return '  '.g:airline_left_alt_sep.' '.toupper(b:keymap_name)
+  endif
+  return ''
 endfunction