remove deprecated variables

over 2 years is more than enough warning...

autoload/airline/deprecation.vim

@@ -5,32 +5,5 @@ function! airline#deprecation#check()
   if !exists('g:loaded_airline_themes')
     echom 'airline themes have been migrated to github.com/vim-airline/vim-airline-themes and will be removed from the core in the near future.'
   endif
-
-  if exists('g:airline_enable_fugitive') || exists('g:airline_fugitive_prefix')
-    echom 'The g:airline_enable_fugitive and g:airline_fugitive_prefix variables are obsolete. Please read the documentation about the branch extension.'
-  endif
-
-  let tests = [
-        \ [ 'g:airline_paste_symbol', 'g:airline_symbols.paste' ],
-        \ [ 'g:airline_readonly_symbol', 'g:airline_symbols.readonly' ],
-        \ [ 'g:airline_linecolumn_prefix', 'g:airline_symbols.linenr' ],
-        \ [ 'g:airline_branch_prefix', 'g:airline_symbols.branch' ],
-        \ [ 'g:airline_branch_empty_message', 'g:airline#extensions#branch#empty_message' ],
-        \ [ 'g:airline_detect_whitespace', 'g:airline#extensions#whitespace#enabled|show_message' ],
-        \ [ 'g:airline_enable_hunks', 'g:airline#extensions#hunks#enabled' ],
-        \ [ 'g:airline_enable_tagbar', 'g:airline#extensions#tagbar#enabled' ],
-        \ [ 'g:airline_enable_csv', 'g:airline#extensions#csv#enabled' ],
-        \ [ 'g:airline_enable_branch', 'g:airline#extensions#branch#enabled' ],
-        \ [ 'g:airline_enable_bufferline', 'g:airline#extensions#bufferline#enabled' ],
-        \ [ 'g:airline_enable_syntastic', 'g:airline#extensions#syntastic#enabled' ],
-        \ [ 'g:airline_enable_eclim', 'g:airline#extensions#eclim#enabled' ],
-        \ ]
-  for test in tests
-    if exists(test[0])
-      let max = winwidth(0) - 16
-      let msg = printf('The variable %s is deprecated and may not work in the future. It has been replaced with %s. Please read the documentation.', test[0], test[1])
-      echom msg[:max].'...'
-    endif
-  endfor
 endfunction
 

autoload/airline/extensions.vim

@@ -160,17 +160,17 @@ function! airline#extensions#load()
     call airline#extensions#undotree#init(s:ext)
   endif
 
-  if (get(g:, 'airline#extensions#hunks#enabled', 1) && get(g:, 'airline_enable_hunks', 1))
+  if get(g:, 'airline#extensions#hunks#enabled', 1)
         \ && (exists('g:loaded_signify') || exists('g:loaded_gitgutter') || exists('g:loaded_changes') || exists('g:loaded_quickfixsigns'))
     call airline#extensions#hunks#init(s:ext)
   endif
 
-  if (get(g:, 'airline#extensions#tagbar#enabled', 1) && get(g:, 'airline_enable_tagbar', 1))
+  if get(g:, 'airline#extensions#tagbar#enabled', 1)
         \ && exists(':TagbarToggle')
     call airline#extensions#tagbar#init(s:ext)
   endif
 
-  if (get(g:, 'airline#extensions#csv#enabled', 1) && get(g:, 'airline_enable_csv', 1))
+  if get(g:, 'airline#extensions#csv#enabled', 1)
         \ && (get(g:, 'loaded_csv', 0) || exists(':Table'))
     call airline#extensions#csv#init(s:ext)
   endif
@@ -180,13 +180,13 @@ function! airline#extensions#load()
     let s:filetype_regex_overrides['^int-'] = ['vimshell','%{substitute(&ft, "int-", "", "")}']
   endif
 
-  if (get(g:, 'airline#extensions#branch#enabled', 1) && get(g:, 'airline_enable_branch', 1))
+  if get(g:, 'airline#extensions#branch#enabled', 1)
         \ && (exists('*fugitive#head') || exists('*lawrencium#statusline') ||
         \     (get(g:, 'airline#extensions#branch#use_vcscommand', 0) && exists('*VCSCommandGetStatusLine')))
     call airline#extensions#branch#init(s:ext)
   endif
 
-  if (get(g:, 'airline#extensions#bufferline#enabled', 1) && get(g:, 'airline_enable_bufferline', 1))
+  if get(g:, 'airline#extensions#bufferline#enabled', 1)
         \ && exists('*bufferline#get_status_string')
     call airline#extensions#bufferline#init(s:ext)
   endif
@@ -199,12 +199,12 @@ function! airline#extensions#load()
     call airline#extensions#eclim#init(s:ext)
   endif
 
-  if (get(g:, 'airline#extensions#syntastic#enabled', 1) && get(g:, 'airline_enable_syntastic', 1))
+  if get(g:, 'airline#extensions#syntastic#enabled', 1)
         \ && exists(':SyntasticCheck')
     call airline#extensions#syntastic#init(s:ext)
   endif
 
-  if (get(g:, 'airline#extensions#whitespace#enabled', 1) && get(g:, 'airline_detect_whitespace', 1))
+  if get(g:, 'airline#extensions#whitespace#enabled', 1)
     call airline#extensions#whitespace#init(s:ext)
   endif
 

autoload/airline/extensions/branch.vim

@@ -105,8 +105,7 @@ endfunction
 
 function! airline#extensions#branch#get_head()
   let head = airline#extensions#branch#head()
-  let empty_message = get(g:, 'airline#extensions#branch#empty_message',
+  let empty_message = get(g:, 'airline#extensions#branch#empty_message', '')
-      \ get(g:, 'airline_branch_empty_message', ''))
   let symbol = get(g:, 'airline#extensions#branch#symbol', g:airline_symbols.branch)
   return empty(head)
         \ ? empty_message

autoload/airline/extensions/whitespace.vim

@@ -3,13 +3,7 @@
 
 " http://got-ravings.blogspot.com/2008/10/vim-pr0n-statusline-whitespace-flags.html
 
-" for backwards compatibility
+let s:show_message = get(g:, 'airline#extensions#whitespace#show_message', 1)
-if exists('g:airline_detect_whitespace')
-  let s:show_message = g:airline_detect_whitespace == 1
-else
-  let s:show_message = get(g:, 'airline#extensions#whitespace#show_message', 1)
-endif
-
 let s:symbol = get(g:, 'airline#extensions#whitespace#symbol', g:airline_symbols.whitespace)
 let s:default_checks = ['indent', 'trailing']
 

autoload/airline/init.vim

@@ -56,11 +56,11 @@ function! airline#init#bootstrap()
 
   call s:check_defined('g:airline_symbols', {})
   call extend(g:airline_symbols, {
-        \ 'paste': get(g:, 'airline_paste_symbol', 'PASTE'),
+        \ 'paste': 'PASTE',
-        \ 'readonly': get(g:, 'airline_readonly_symbol', get(g:, 'airline_powerline_fonts', 0) ? "\ue0a2" : 'RO'),
+        \ 'readonly': get(g:, 'airline_powerline_fonts', 0) ? "\ue0a2" : 'RO',
         \ 'whitespace': get(g:, 'airline_powerline_fonts', 0) ? "\u2739" : '!',
-        \ 'linenr': get(g:, 'airline_linecolumn_prefix', get(g:, 'airline_powerline_fonts', 0) ? "\ue0a1" : ':' ),
+        \ 'linenr': get(g:, 'airline_powerline_fonts', 0) ? "\ue0a1" : ':',
-        \ 'branch': get(g:, 'airline_branch_prefix', get(g:, 'airline_powerline_fonts', 0) ? "\ue0a0" : ''),
+        \ 'branch': get(g:, 'airline_powerline_fonts', 0) ? "\ue0a0" : '',
         \ 'modified': '+',
         \ 'space': ' ',
         \ 'crypt': get(g:, 'airline_crypt_symbol', nr2char(0x1F512)),