prefer function name instead of funcref.

autoload/airline.vim

@@ -1,9 +1,26 @@
 " MIT License. Copyright (c) 2013 Bailey Ling.
 " vim: et ts=2 sts=2 sw=2
 
+let g:airline_statusline_funcrefs = get(g:, 'airline_statusline_funcrefs', [])
+
 let s:sections = ['a','b','c','gutter','x','y','z','warning']
 let s:highlighter = airline#highlighter#new()
 
+function! airline#add_statusline_func(name)
+  call airline#add_statusline_funcref(function(a:name))
+endfunction
+
+function! airline#add_statusline_funcref(function)
+  call add(g:airline_statusline_funcrefs, a:function)
+endfunction
+
+function! airline#remove_statusline_func(name)
+  let i = index(g:airline_statusline_funcrefs, function(a:name))
+  if i > -1
+    call remove(g:airline_statusline_funcrefs, i)
+  endif
+endfunction
+
 function! airline#load_theme()
   call s:highlighter.load_theme()
   call airline#extensions#load_theme()

autoload/airline/extensions.vim

@@ -2,8 +2,11 @@
 " vim: et ts=2 sts=2 sw=2
 
 let s:ext = {}
-function! s:ext.add_statusline_funcref(funcref) dict
-  call add(g:airline_statusline_funcrefs, a:funcref)
+function! s:ext.add_statusline_func(name) dict
+  call airline#add_statusline_func(a:name)
+endfunction
+function! s:ext.add_statusline_funcref(function) dict
+  call airline#add_statusline_funcref(a:function)
 endfunction
 
 let s:script_path = expand('<sfile>:p:h')
@@ -104,7 +107,7 @@ function! airline#extensions#load()
   autocmd CursorMoved * call <sid>sync_active_winnr()
 
   " load core funcrefs
-  call add(g:airline_statusline_funcrefs, function('airline#extensions#update_statusline'))
+  call airline#add_statusline_func('airline#extensions#update_statusline')
 
   if get(g:, 'loaded_unite', 0)
     let g:unite_force_overwrite_statusline = 0

autoload/airline/extensions/bufferline.vim

@@ -26,6 +26,6 @@ function! airline#extensions#bufferline#init(ext)
   let g:bufferline_separator = ' '
 
   if g:airline_section_c == '%f%m'
-    call a:ext.add_statusline_funcref(function('airline#extensions#bufferline#apply'))
+    call a:ext.add_statusline_func('airline#extensions#bufferline#apply')
   endif
 endfunction

autoload/airline/extensions/commandt.vim

@@ -8,5 +8,5 @@ function! airline#extensions#commandt#apply(...)
 endfunction
 
 function! airline#extensions#commandt#init(ext)
-  call a:ext.add_statusline_funcref(function('airline#extensions#commandt#apply'))
+  call a:ext.add_statusline_func('airline#extensions#commandt#apply')
 endfunction

autoload/airline/extensions/csv.vim

@@ -27,6 +27,6 @@ function! airline#extensions#csv#apply(...)
 endfunction
 
 function! airline#extensions#csv#init(ext)
-  call a:ext.add_statusline_funcref(function('airline#extensions#csv#apply'))
+  call a:ext.add_statusline_func('airline#extensions#csv#apply')
 endfunction
 

autoload/airline/extensions/ctrlp.vim

@@ -59,6 +59,6 @@ function! airline#extensions#ctrlp#init(ext)
         \ 'main': 'airline#extensions#ctrlp#ctrlp_airline',
         \ 'prog': 'airline#extensions#ctrlp#ctrlp_airline_status',
         \ }
-  call a:ext.add_statusline_funcref(function('airline#extensions#ctrlp#apply'))
+  call a:ext.add_statusline_func('airline#extensions#ctrlp#apply')
 endfunction
 

autoload/airline/extensions/example.vim

@@ -9,13 +9,13 @@ endif
 " First you should follow the convention and define an 'init' function.
 " It takes a single argument, which is the 'ext'ension manager of sorts,
 " which you can invoke certain functions.  The most important one is
-" 'add_statusline_funcref', which as the name implies, adds a funcref to
+" 'add_statusline_func', which as the name implies, adds a function to
 " the collection such that it will be invoked prior to changes being made
 " to the statusline. Finally, invoke this init function in the
 " 'extensions.vim' file after a check to a non-autoloaded variable,
 " command, or function.
 function! airline#extensions#example#init(ext)
-  call a:ext.add_statusline_funcref(function('airline#extensions#example#apply'))
+  call a:ext.add_statusline_func('airline#extensions#example#apply')
 
   " Alternatively, you can also modify the default global section by
   " appending or prepending to it.  But read on to see why using the funcref

autoload/airline/extensions/syntastic.vim

@@ -7,6 +7,6 @@ function! airline#extensions#syntastic#apply(...)
 endfunction
 
 function! airline#extensions#syntastic#init(ext)
-  call a:ext.add_statusline_funcref(function('airline#extensions#syntastic#apply'))
+  call a:ext.add_statusline_func('airline#extensions#syntastic#apply')
 endfunction
 

autoload/airline/extensions/tagbar.vim

@@ -18,7 +18,7 @@ function! s:check_statusline()
 endfunction
 
 function! airline#extensions#tagbar#init(ext)
-  call a:ext.add_statusline_funcref(function('airline#extensions#tagbar#apply'))
+  call a:ext.add_statusline_func('airline#extensions#tagbar#apply')
 
   let g:airline_section_x = '%(%{get(w:,"airline_active",0) ? tagbar#currenttag("%s","") : ""} '
         \ .g:airline_right_alt_sep.' %)'.g:airline_section_x

autoload/airline/extensions/undotree.vim

@@ -16,6 +16,6 @@ function! airline#extensions#undotree#apply(...)
 endfunction
 
 function! airline#extensions#undotree#init(ext)
-  call a:ext.add_statusline_funcref(function('airline#extensions#undotree#apply'))
+  call a:ext.add_statusline_func('airline#extensions#undotree#apply')
 endfunction
 

autoload/airline/extensions/whitespace.vim

@@ -73,7 +73,7 @@ endfunction
 function! airline#extensions#whitespace#init(...)
   if !s:initialized
     let s:initialized = 1
-    call add(g:airline_statusline_funcrefs, function('airline#extensions#whitespace#apply'))
+    call airline#add_statusline_func('airline#extensions#whitespace#apply')
   endif
 
   unlet! b:airline_whitespace_check