Is there a way to set the root directory to the directory of the currently focused buffer?

[dpetka2001]

Sometimes i open a file with nvim like nvim ~/.config/nvim/lua/test.lua.
When I open nvim-tree it opens with the root_dir set at ~ but it correctly focuses and selects the opened file
as I've set in update_focused_file. In the manual it says about update_focused_file that update_root prefers
vim's cwd and root_dirs otherwise it falls back to the folder containing the file. Is there a way to make the default
behavior when opening nvim-tree, so that the root directory will be that of the folder containing the file? So instead of
it being set to ~ (from where i run nvim to open the file), it should be set to ~/.config/nvim/lua/ which is the actual
folder the file resides in? Thanks in advance.

[alex-courtis]

You can try something like this:

local function my_startup(data)

  -- is the buffer a real file?
  if vim.fn.filereadable(data.file) ~= 1 then
    return
  end

  -- is it in a real directory
  local dir = vim.fn.fnamemodify(data.file, ":h")
  if vim.fn.isdirectory(dir) == 0 then
    return
  end

  -- change directory
  vim.cmd.cd(dir)
end

vim.api.nvim_create_autocmd({ "VimEnter" }, { callback = my_startup })

See #1669 (comment) for more ideas.