extract all plugin related functionality out of the core

autoload/airline.vim

@@ -104,7 +104,7 @@ function! s:get_statusline(winnr, active)
   return sl
 endfunction
 
-function! s:exec_funcrefs(list, break_early)
+function! airline#exec_funcrefs(list, break_early)
   " for 7.2; we cannot iterate list, hence why we use range()
   " for 7.3-[97, 328]; we cannot reuse the variable, hence the {}
   for i in range(0, len(a:list) - 1)
@@ -121,7 +121,7 @@ function! s:exec_funcrefs(list, break_early)
 endfunction
 
 function! airline#update_statusline()
-  if s:exec_funcrefs(g:airline_exclude_funcrefs, 1)
+  if airline#exec_funcrefs(g:airline_exclude_funcrefs, 1)
     call setwinvar(winnr(), '&statusline', '')
     return
   endif
@@ -130,7 +130,7 @@ function! airline#update_statusline()
   for section in s:sections
     unlet! w:airline_section_{section}
   endfor
-  call s:exec_funcrefs(g:airline_statusline_funcrefs, 0)
+  call airline#exec_funcrefs(g:airline_statusline_funcrefs, 0)
 
   let w:airline_active = 1
   call setwinvar(winnr(), '&statusline', s:get_statusline(winnr(), 1))

autoload/airline/extensions.vim

@@ -18,7 +18,10 @@ function! airline#extensions#apply_left_override(section1, section2)
   let w:airline_left_only = 1
 endfunction
 
-function! airline#extensions#apply_window_overrides()
+let s:active_winnr = -1
+function! airline#extensions#update_statusline()
+  let s:active_winnr = winnr()
+
   if &buftype == 'quickfix'
     let w:airline_section_a = 'Quickfix'
     let w:airline_section_b = ''
@@ -90,19 +93,33 @@ function! airline#extensions#load_theme()
   endif
 endfunction
 
+function! s:sync_active_winnr()
+  if winnr() != s:active_winnr
+    if airline#exec_funcrefs(s:ext._cursormove_funcrefs, 1)
+      return
+    endif
+    call airline#update_statusline()
+  endif
+endfunction
+
 function! airline#extensions#load()
+  " non-trivial number of external plugins use eventignore=all, so we need to account for that
+  autocmd CursorMoved * call <sid>sync_active_winnr()
+
+  " load core funcrefs
+  call add(g:airline_exclude_funcrefs, function('airline#extensions#is_excluded_window'))
+  call add(g:airline_statusline_funcrefs, function('airline#extensions#update_statusline'))
+
   if get(g:, 'loaded_unite', 0)
     let g:unite_force_overwrite_statusline = 0
   endif
+
   if get(g:, 'loaded_vimfiler', 0)
     let g:vimfiler_force_overwrite_statusline = 0
   endif
 
   if get(g:, 'loaded_ctrlp', 0)
-    let g:ctrlp_status_func = {
-          \ 'main': 'airline#extensions#ctrlp#ctrlp_airline',
-          \ 'prog': 'airline#extensions#ctrlp#ctrlp_airline_status',
-          \ }
+    call airline#extensions#ctrlp#init(s:ext)
   endif
 
   if get(g:, 'command_t_loaded', 0)
@@ -125,9 +142,6 @@ function! airline#extensions#load()
     call airline#extensions#bufferline#init(s:ext)
   endif
 
-  call add(g:airline_statusline_funcrefs, function('airline#extensions#apply_window_overrides'))
-  call add(g:airline_exclude_funcrefs, function('airline#extensions#is_excluded_window'))
-
-  call airline#extensions#update_external_values()
+  call airline#exec_funcrefs(g:airline_statusline_funcrefs, 0)
 endfunction
 

autoload/airline/extensions/ctrlp.vim

@@ -26,10 +26,7 @@ function! airline#extensions#ctrlp#load_theme()
   endfor
 endfunction
 
-" Recreate Ctrl-P status line with some slight modifications
-
 " 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#extensions#ctrlp#ctrlp_airline(...)
   let regex = a:3 ? '%#CtrlPlight#  regex %*' : ''
   let prv = '%#CtrlPlight# '.a:4.' %#Ctrlparrow1#'.g:airline_left_sep
@@ -39,15 +36,24 @@ function! airline#extensions#ctrlp#ctrlp_airline(...)
   let focus = '%=%<%#CtrlPdark# '.a:1.' %*'
   let byfname = '%#CtrlParrow3#'.g:airline_right_alt_sep.'%#CtrlPdark# '.a:2.' %*'
   let dir = '%#CtrlParrow3#'.g:airline_right_sep.'%#CtrlPlight# '.getcwd().' %*'
-  " Return the full statusline
   return regex.prv.item.nxt.marked.focus.byfname.dir
 endfunction
 
 " Argument: len
-" a:1
 function! airline#extensions#ctrlp#ctrlp_airline_status(...)
   let len = '%#CtrlPdark# '.a:1
   let dir = '%=%<%#CtrlParrow3#'.g:airline_right_sep.'%#CtrlPlight# '.getcwd().' %*'
-  " Return the full statusline
   return len.dir
 endfunction
+
+function! airline#extensions#ctrlp#is_statusline_overwritten()
+  return match(&statusline, 'CtrlPlight') >= 0
+endfunction
+
+function! airline#extensions#ctrlp#init(ext)
+  let g:ctrlp_status_func = {
+        \ 'main': 'airline#extensions#ctrlp#ctrlp_airline',
+        \ 'prog': 'airline#extensions#ctrlp#ctrlp_airline_status',
+        \ }
+  call a:ext.add_cursormove_funcref(function('airline#extensions#ctrlp#is_statusline_overwritten'))
+endfunction