Automatically quit vim if NERDTree is last and only buffer

Question

I have the following in my .vimrc:

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Answer 1

An idea in need of implementation:

You could write a function which, when called, checks if the only buffer remaining (or perhaps the only non-help buffer, if you prefer) is a NERDTree buffer and, if so, deletes it (or just quits).

Then have an autocmd run it whenever a buffer is deleted / hidden / whatever actually happens when you :q (it shames me to admit I'm not entirely sure!).