nvim/lua/config/autocmd.lua

local is_git_dir = function()
	return os.execute("git rev-parse --is-inside-work-tree >> /dev/null 2>&1")
end

local dir_picker_group = vim.api.nvim_create_augroup("DirPicker", { clear = true })

vim.api.nvim_create_autocmd("VimEnter", {
	group = dir_picker_group,
	callback = function()
		-- If launched as `nvim <dir>`, open Telescope and wipe unnamed normal buffers once a real file is opened.
		if vim.fn.argc() == 1 then
			local target = vim.fn.argv(0)
			if vim.fn.isdirectory(target) == 1 then
				vim.api.nvim_create_autocmd("BufEnter", {
					group = dir_picker_group,
					callback = function()
						local buf = vim.api.nvim_get_current_buf()
						if vim.api.nvim_buf_get_name(buf) ~= "" then
							for _, b in ipairs(vim.api.nvim_list_bufs()) do
								if vim.api.nvim_buf_get_name(b) == "" and vim.bo[b].buftype == "" then
									pcall(vim.api.nvim_buf_delete, b, { force = true })
								end
							end
							vim.api.nvim_del_augroup_by_id(dir_picker_group)
						end
					end,
				})

				local ts_builtin = require("telescope.builtin")
				vim.defer_fn(function()
					if is_git_dir() == 0 then
						ts_builtin.git_files({ show_untracked = true })
					else
						ts_builtin.find_files()
					end
				end, 10)
			end
		end
	end,
})