musttest_game/mods/extra_stairs/init.lua

-- If any trees get added to the game, consider extending this list.
local all_trees = {
	{trunk="basictrees:acacia_trunk"},
	{trunk="basictrees:aspen_trunk"},
	{trunk="basictrees:jungletree_trunk"},
	{trunk="basictrees:pine_trunk"},
	{trunk="basictrees:tree_trunk"},

	{trunk="jungletree:jungletree_tree"},
	{trunk="firetree:trunk"},

	{trunk="moretrees:apple_tree_tree"},
	{trunk="moretrees:beech_tree"},
	{trunk="moretrees:birch_tree"},
	{trunk="moretrees:cedar_tree"},
	{trunk="moretrees:date_palm_tree"},
	{trunk="moretrees:fir_tree"},
	{trunk="moretrees:jungletree_tree"},
	{trunk="moretrees:oak_tree"},
	{trunk="moretrees:palm_tree"},
	{trunk="moretrees:poplar_tree"},
	{trunk="moretrees:rubber_tree_tree"},
	{trunk="moretrees:sequoia_tree"},
	{trunk="moretrees:spruce_tree"},
	{trunk="moretrees:willow_tree"},
}

-- For all listed tree trunk nodes, register cuttings for them.
for _, tree in ipairs(all_trees) do
	assert(type(tree.trunk) == "string")
	local ndef = minetest.registered_items[tree.trunk]
	assert(ndef)
	assert(ndef.sounds)
	assert(ndef.tiles)
	assert(ndef.description)

	local stairname = string.split(tree.trunk, ":")[2]
	assert(type(stairname) == "string")

	stairs.register_stair_and_slab(
		stairname,
		tree.trunk,
		{choppy = 3, oddly_breakable_by_hand = 1, flammable = 2},
		ndef.tiles,
		ndef.description,
		ndef.sounds
	)
end