vimrc: add func to refresh ui after sourcing vimrc

.vim/vimrc

@@ -1002,8 +1002,30 @@ silent function! LINUX()
   return has('unix') && !has('macunix') && !has('win32unix')
 endfunction
 
+
+" note: this might be outdated at this point, I am not sure.
+" https://github.com/bling/vim-airline/issues/539
+function! RefreshUI()
+  if exists(':AirlineRefresh')
+    AirlineRefresh
+  else
+    " Clear & redraw the screen, then redraw all statuslines.
+    redraw!
+    redrawstatus!
+  endif
+endfunction
+
+" from vim wiki
+augroup autoReloadVimRC
+  autocmd!
+  " automatically reload vimrc when it's saved
+  autocmd BufWritePost ~/.vimrc so ~/.vimrc | call RefreshUI()
+augroup END
+
+" reload config
 nnoremap <Leader>ve :e $MYVIMRC<CR>
-nnoremap <Leader>vr :source $MYVIMRC<CR>
+" reload config and call refresh fn
+nnoremap <Leader>vr :source $MYVIMRC<CR>call RefreshUI()<CR>
 
 " https://sw.kovidgoyal.net/kitty/faq/#using-a-color-theme-with-a-background-color-does-not-work-well-in-vim
 " work wround vim's background colour erase