How can I switch to the `[No Name]` buffer

Question

As title. Is it possible to change the current buffer by vimscript to the (only) [No Name] buffer?

I need these tools:

• an API to return all (loaded) buffers
• loop through each of them
  • if the buffer is a No Name-buffer, then record its buffer number
• an API to edit that buffer from the current window.

I put emphasis on "the only" is that what I want to do is to keep only one No Name-buffer, so there won't be many No Name-buffers that spam out there. To do so my idea is that whenever I want to open a new No Name-buffer use a script to check if there is one: if so switch to it, if not then really create one.

Answer 1

an API to return all (loaded) buffers

:h getbufinfo()

loop through each of them

:h filter()

if the buffer is a No Name-buffer

:echo empty(bufname(N))
:echo empty(getbufinfo(N)[0].name)

an API to edit that buffer on the current window (split) by that buffer number

:h :buffer

Answer 2

This is the Lua version:

• an API to return all (loaded) buffers
• loop through each of them
  • if the buffer is a No Name-buffer, then record its buffer number

local function is_no_name_buf(buf)
  return
    vim.api.nvim_buf_is_loaded(buf)
    and vim.api.nvim_buf_get_option(buf, 'buflisted')
    and vim.api.nvim_buf_get_name(buf) == ''
    and vim.api.nvim_buf_get_option(buf, 'buftype') == ''
    and vim.api.nvim_buf_get_option(buf, 'filetype') == ''
end

local all_no_name = vim.tbl_filter(is_no_name_buf, vim.api.nvim_list_bufs())

an API to edit that buffer from the current window.

vim.api.nvim_win_set_buf(win, buf_to_put)