uuidgen + pngpasteを実行してimages/に画像ファイルを保存するスクリプト

command.lua

local function uuid()
	local command = "uuidgen | tr '[:upper:]' '[:lower:]'"
	local handle, error = io.popen(command)

	if not handle then
		return nil, error
	end

	local result = handle:read("*a"):gsub("%s", "")
	handle:close()
	return result
end

vim.api.nvim_create_user_command("PasteImage", function()
	local filename = uuid() .. ".png"
	local image_path = "images/" .. filename

	os.execute("pngpaste" .. " " .. image_path)

	vim.fn.setline(".", "![" .. filename .. "](/" .. image_path .. ")")
end, {})