How do I map
<leader>r which clears CtrlP's cache and refreshes NERDTree's root directory?
Pseudo code, I have:
map <Leader>r :CtrlPClearCache<cr>g:NERDTreeMapRefreshRoot<cr>
CtrlPClearCache clears the cache, but I haven't found a command to refresh the root node of NERDTree, without being in a NERDTree window.