local function find_swap(items)
    for i, v in ipairs(items) do
        local n = minetest.find_item(v)
        if n then
            minetest.localplayer:set_wield_index(n - 1)
            return true
        end
    end
    return false
end

local function in_list(val, list)
    for i, v in ipairs(list) do
        if v == val then
            return true
        end
    end
    return false
end

local function nilify_node(node)
    if node and (node.name == "air" or minetest.get_node_def(node.name).buildable_to) then
        return nil
    end
    return node or {name = ""}
end

local dirt = {
    "mcl_core:dirt",
    "mcl_core:dirt_with_grass"
}

local saplings = {
    "mcl_core:sapling",
    "mcl_core:darksapling",
    "mcl_core:junglesapling",
    "mcl_core:sprucesapling",
    "mcl_core:birchsapling",
    "mcl_core:acaciasapling"
}

local function sapper(below)
    local lp = vector.round(minetest.localplayer:get_pos())
    local node_here = nilify_node(minetest.get_node_or_nil(lp))
    local node_under = nilify_node(minetest.get_node_or_nil(below))

    -- if theres a node below its prob bad but its good if its dirt
    if node_under and not in_list(node_under.name, dirt) then
        return
    end

    if not node_under and find_swap(dirt) then
        minetest.place_node(below)
    end

    if not node_here and find_swap(saplings) then
        minetest.place_node(lp)
    end
end

scaffold.register_template_scaffold("scaffold_saplings", sapper)

if minetest.register_cheat then
    minetest.register_cheat("SapScaffold", "Scaffold", "scaffold_saplings")
end