lua code for minetest

minetest.register_on_punchnode(function (pos, node, puncher)
    if string.find(node.name, "jumping:trampoline") then
        local id = string.sub(node.name, #node.name) --get number
        local name = puncher:get_player_name() --get puncher's name
        id = id + 1
        if id == 7 then id = 1 end
        minetest.env:add_node(pos, {name = string.sub(node.name, 1, #node.name - 1)..id})
        minetest.chat_send_player(name, "Setting: "..id) --tell the puncher what setting the trampoline is
    end
end)