Best way to open Snacks.dashboard when all buffers are closed

[DaniBedz]

Just wondering if anyone has a good way to automatically open the dashboard when all named buffers are closed?

I tried to do this by an auto-command, but it throws invalid buffer id errors the second time I go to the dashboard and open a new buffer, as well as hiding my lualine.

Here's what I tried:

vim.api.nvim_create_augroup("DashboardAutoOpen", { clear = true })
vim.api.nvim_create_autocmd({ "BufDelete" }, {
	group = "DashboardAutoOpen",
	callback = function()
		vim.schedule(function()
			local buffers = vim.tbl_filter(function(buf)
				return vim.api.nvim_buf_is_valid(buf) and vim.bo[buf].buflisted and vim.api.nvim_buf_get_name(buf) ~= ""
			end, vim.api.nvim_list_bufs())

			if #buffers == 0 then
				vim.cmd("lua Snacks.dashboard()")
			end
		end)
	end,
})

Any guidance would be very much appreciated.

[SuXYIO]

Your autocmd works pretty good for me, i didn't see any errors, except that a empty buffer is created after opening a file via your autocmd opened dashboard

[DaniBedz]

Thanks for taking a look.

That's very strange, I'm able to recreate the errors with this very minimal repro (just lazy, Snacks and the autocmd):

https://github.com/DaniBedz/nvim-minimal

All I do is:

1. Open Neovim (dashboard shows automatically)
2. Open a buffer
3. Close it (dashboard is toggled on by the autocmd)
4. Open another buffer

Error executing vim.schedule lua callback: ...ni/.local/share/nvim/lazy/snacks.nvim/lua/snacks/win.lua:499: Invalid buffer id: 4
stack traceback:
[C]: in function 'nvim_win_set_buf'
...ni/.local/share/nvim/lazy/snacks.nvim/lua/snacks/win.lua:499: in function <...ni/.local/share/nvim/lazy/snacks.nvim/lua/snacks/win.lua: 498>

[dikesh]

I am also getting the same error.

[SuXYIO]

okay, seems like i can reproduce it too. also the terminal section in dashboard is still showing up, lualine is still closed (probably has something to do with my lualine set to hide on filetype snacks_dashboard), nvimtree can't open too, with similar error.
what is more interesting, i have to quit twice to quit nvim in the new buffer.

[SuXYIO]

i think your buffer count code has no big problems, since just running lua Snacks.dashboard() leads to similar problems. lua Snacks.dashboard.open() doesn't help either.
So i experimented with window numbers. the initial window number was 1000, and was 1013 when i opened the dashboard via :lua Snacks.dashboard(), and was still 1013 when i ran :e foo.lua. That explains the double quit.
Maybe we should close the dashboard first before opening a new file. But i didn't think up of any elegant way, creating another autocmd seems redundant. I'm now trying to mimic the behavior of a normal dashboard file open

snacks.nvim/lua/snacks/dashboard.lua

Line 851 in 972c61c

action = ":e " .. file,

vim.api.nvim_create_autocmd({ "BufRead" }, {
	group = "DashboardAutoOpen",
	callback = function()
		if Snacks.dashboard.status.opened == true then
			-- mimic normal dashboard fileopen
		end
	end
})

im really not an expert on this 😅