Redetect filetype after saving as new name + wrap autocmd with check

vim/config/settings.vim

@@ -84,6 +84,7 @@
         set timeout timeoutlen=500 "how long before timing out for mappings
         set ttimeout ttimeoutlen=100 "how long before timing out for terminal key codes
 
+        if has('autocmd')
             "enable the auto-creation of missing folders in a save path
             if !exists('*s:MakeNewDir')
                 function s:MakeNewDir(fullpath, buf)
@@ -97,5 +98,12 @@
                     autocmd BufWritePre * :call s:MakeNewDir(expand('<afile>'),+expand('<abuf>'))
                 augroup END
             endif
+
+            "update the current filetype when a file is renamed
+            augroup RenameCheckFiletype
+                autocmd!
+                autocmd BufFilePost * filetype detect
+            augroup END
+        endif
     "}}}
 "}}}