renew/compost.lua

-- Renew mod for Minetest
-- Copyright © 2018 Alex Yst <https://y.st./>

-- This program is free software; you can redistribute it and/or
-- modify it under the terms of the GNU Lesser General Public
-- License as published by the Free Software Foundation; either
-- version 2.1 of the License, or (at your option) any later version.

-- This software is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-- Lesser General Public License for more details.

-- You should have received a copy of the GNU Lesser General Public
-- License along with this program. If not, see
-- <https://www.gnu.org./licenses/>.

minetest.register_node("renew:compost", {
	description = "Compost",
	tiles = {"renew-compost.png"},
	groups = {crumbly=3, soil=1},
	sounds = default.node_sound_dirt_defaults(),
})

minetest.register_craft({
	output = "renew:compost",
	recipe = {
		{"group:leaves", "group:leaves", "group:leaves"},
		{"group:leaves", "group:leaves", "group:leaves"},
		{"group:leaves", "group:leaves", "group:leaves"},
	}
})

minetest.register_abm({
	label = "Compost rotting",
	nodenames = {"renew:compost"},
	neighbors = {"group:spreading_dirt_type", "group:flora", "flowers:mushroom_brown", "flowers:mushroom_red"},
	interval = 60,
	chance = 60,
	catch_up = true,
	action = function(pos)
-- If the node above is not air, a plant, or a decomposer (a mushroom),
-- decomposition cannot occur.
		local node_above = minetest.get_node({x=pos.x, y=pos.y+1, z=pos.z})
		if node_above.name ~= "air"
		and node_above.name ~= "flowers:mushroom_brown"
		and node_above.name ~= "flowers:mushroom_red"
		and minetest.get_item_group(node_above.name, "flora") == 0 then
			return
		end
-- Spreading dirt types will take over compost, converting it into
-- their specific type of dirt.
		local spreader_pos = minetest.find_node_near(pos, 1, "group:spreading_dirt_type")
		if spreader_pos then
			local spreader = minetest.get_node(spreader_pos)
			minetest.set_node(pos, {name=spreader.name})
			return
-- If a spreading dirt type isn't around, compost will simply decompose
-- into regular dirt, but only if something is growing on it.
		elseif node_above.name ~= "air" then
			minetest.set_node(pos, {name="default:dirt"})
		end
	end,
})