how to write auto close autocmd in lua nvim_create_autocmd api?

[nshen]

autocmd BufEnter * ++nested if winnr('$') == 1 && bufname() == 'NvimTree_' . tabpagenr() | quit | endif

how to write the command ?

vim.api.nvim_create_autocmd(
   "BufEnter",
   { command = "++nested if winnr('$') == 1 && bufname() == 'NvimTree_' . tabpagenr() | quit | endif" }
 )

[nshen]

I have tried a lot. Is this correct?

vim.api.nvim_create_autocmd("BufEnter", {
  callback = function()
    if vim.fn.winnr("$") == 1 and vim.fn.bufname() == ("NvimTree_" .. vim.fn.tabpagenr()) then
      vim.cmd("quit")
    end
  end,
})

[nshen]

But I don't understand what ++nested mean.

[gegoune]

:h autocmd-nested describes it, it is so events get executed for commands/events in your top level autocommand.

[nshen]

:h autocmd-nested describes it, it is so events get executed for commands/events in your top level autocommand.

oh thanks I thought it was some variable increasing.

final version:

vim.api.nvim_create_autocmd("BufEnter", {
  nested = true,
  callback = function()
    if vim.fn.winnr("$") == 1 and vim.fn.bufname() == ("NvimTree_" .. vim.fn.tabpagenr()) then
      vim.cmd("quit")
    end
  end,
})

[kyazdani42]

check the existing discussions please... #1115

[nshen]

oh thanks, I think your answer should be ~= nil