move ctrlp into new extensions area

autoload/airline/extensions.vim

@@ -0,0 +1,9 @@
+function! airline#extensions#load()
+  if exists('g:loaded_ctrlp') && g:loaded_ctrlp
+    call airline#extensions#ctrlp#load_ctrlp_hi()
+    let g:ctrlp_status_func = {
+          \ 'main': 'airline#extensions#ctrlp#ctrlp_airline',
+          \ 'prog': 'airline#extensions#ctrlp#ctrlp_airline_status',
+          \ }
+  endif
+endfunction

autoload/airline/extensions/ctrlp.vim

@@ -1,5 +1,6 @@
+" TODO: support loading color palette from g:airline_theme
 
-function! airline#themes#ctrlp#load_ctrlp_hi()
+function! airline#extensions#ctrlp#load_ctrlp_hi()
   hi! CtrlPdark ctermfg=189 ctermbg=55 guifg=#d7d7ff guibg=#5f00af
   hi! CtrlPlight ctermfg=231 ctermbg=98 guifg=#ffffff guibg=#875fd7
   hi! CtrlPwhite ctermfg=55 ctermbg=231 term=bold guifg=#5f00af guibg=#ffffff gui=bold
@@ -14,7 +15,7 @@ endfunction
 
 " Arguments: focus, byfname, s:regexp, prv, item, nxt, marked
 " a:1 a:2 a:3 a:4 a:5 a:6 a:7
-function! airline#themes#ctrlp#ctrlp_airline(...)
+function! airline#extensions#ctrlp#ctrlp_airline(...)
   let regex = a:3 ? '%#CtrlPlight#  regex %*' : ''
   let prv = '%#CtrlPlight# '.a:4.' %#Ctrlparrow1#'.g:airline_left_sep
   let item = '%#CtrlPwhite# '.a:5.' %#CtrlParrow2#'.g:airline_left_sep
@@ -29,11 +30,9 @@ endfunction
 
 " Argument: len
 " a:1
-function! airline#themes#ctrlp#ctrlp_airline_status(...)
+function! airline#extensions#ctrlp#ctrlp_airline_status(...)
   let len = '%#CtrlPwhite# '.a:1
   let dir = '%=%<%#CtrlParrow5#'.g:airline_right_sep.'%#CtrlPlight# '.getcwd().' %*'
   " Return the full statusline
   return len.dir
 endfunction
-
-

plugin/airline.vim

@@ -26,15 +26,6 @@ call s:check_defined('g:airline_exclude_filetypes', ['qf','netrw','diff','undotr
 let s:is_win32term = (has('win32') || has('win64')) && !has('gui_running')
 let s:load_the_theme = g:airline#themes#{g:airline_theme}#normal
 
-if exists('g:loaded_ctrlp') && g:loaded_ctrlp
-  call airline#themes#ctrlp#load_ctrlp_hi()
-  " ctrlp only looks for this
-  let g:ctrlp_status_func = {
-  \ 'main': 'airline#themes#ctrlp#ctrlp_airline',
-  \ 'prog': 'airline#themes#ctrlp#ctrlp_airline_status',
-  \ }
-endif
-
 call s:check_defined('g:airline_mode_map', {
       \ 'n'  : 'NORMAL',
       \ 'i'  : 'INSERT',
@@ -100,6 +91,7 @@ function! s:update_externals()
         \ ? g:airline_fugitive_prefix.fugitive#head() : ''
 
   if !s:airline_sections_defined
+    call airline#extensions#load()
     call s:check_defined('g:airline_section_a', '%{g:airline_current_mode_text}')
     call s:check_defined('g:airline_section_b', '%{g:airline_externals_fugitive}')
     call s:check_defined('g:airline_section_c', g:airline_externals_bufferline)