vim.api.nvim_create_autocmd({'BufEnter', 'QuitPre'}, {
    nested = false,
    callback = function(e)
        local tree = require('nvim-tree.api').tree

        -- Nothing to do if tree is not opened
        if not tree.is_visible() then
            return
        end

        -- How many focusable windows do we have? (excluding e.g. incline status window)
        local winCount = 0
        for _,winId in ipairs(vim.api.nvim_list_wins()) do
            if vim.api.nvim_win_get_config(winId).focusable then
                winCount = winCount + 1
            end
        end

        -- We want to quit and only one window besides tree is left
        if e.event == 'QuitPre' and winCount == 2 then
            vim.api.nvim_cmd({cmd = 'qall'}, {})
        end

        -- :bd was probably issued an only tree window is left
        -- Behave as if tree was closed (see `:h :bd`)
        if e.event == 'BufEnter' and winCount == 1 then
            -- Required to avoid "Vim:E444: Cannot close last window"
            vim.defer_fn(function()
                -- close nvim-tree: will go to the last buffer used before closing
                tree.toggle({find_file = true, focus = true})
                -- re-open nivm-tree
                tree.toggle({find_file = true, focus = false})
            end, 10)
        end
    end
})