One mapping to toggle NERDTree and open to current file when toggling on

Question

I'm trying to find a way to have a normal mode mapping that can toggle NERDTree, but when toggling on, tell NERDTree to find the current file.

I know about NERDTreeToggle and NERDTreeFind, and what I'm looking to do is essentially a combination of those two commands.

Here's my use case:

1. When NERDTree is not open, I can hit <C-\> and NERDTree will open to the current file.
2. I can then hit <C-\> again and NERDTree will close.

Answer 1

The first answer didn't work for me so I came up with this:

function MyNerdToggle()
    if &filetype == 'nerdtree'
        :NERDTreeToggle
    else
        :NERDTreeFind
    endif
endfunction

nnoremap <C-\> :call MyNerdToggle()<CR>

Answer 2

This will do exactly what you want:

nnoremap <silent> <expr> <C-\> g:NERDTree.IsOpen() ? "\:NERDTreeClose<CR>" : bufexists(expand('%')) ? "\:NERDTreeFind<CR>" : "\:NERDTree<CR>"

Answer 3

function! NerdTreeToggleFind()
    if exists("g:NERDTree") && g:NERDTree.IsOpen()
        NERDTreeClose
    elseif filereadable(expand('%'))
        NERDTreeFind
    else
        NERDTree
    endif
endfunction

nnoremap <C-\> :call NerdTreeToggleFind()<CR>