regrowing_fruits/init.lua

local regrowing_apples = minetest.settings:get_bool("regrowing_apples", true)

local add_fruit_regrowable = function(fruit, node, leaves)

	-- check if node exists
	if not minetest.registered_nodes[node] then
		return
	end

	-- override fruit
	minetest.override_item(node, {
		groups = {dig_immediate=3}, -- make sure (moretrees) fruits don't fall on dig
		after_place_node = function(pos, placer)
			if placer:is_player() then
				minetest.set_node(pos, {name = node, param2 = 1})
			end
		end, -- make sure (moretrees) fruits aren't placed by player
		on_dig = minetest.node_dig, -- override on_dig functions causing regrowth not to work
		after_dig_node = function(pos, oldnode, oldmetadata, digger)
			if oldnode.param2 == 0 then
				minetest.set_node(pos, {name = "regrowing_fruits:"..fruit.."_mark"})
				minetest.get_node_timer(pos):start(math.random(300, 1500))
			end
		end,
	})

	-- air node to mark fruit pos
	minetest.register_node("regrowing_fruits:"..fruit.."_mark", {
		description = "Air!",
		drawtype = "airlike",
		paramtype = "light",
		sunlight_propagates = true,
		walkable = false,
		pointable = false,
		diggable = false,
		buildable_to = true,
		drop = "",
		groups = {not_in_creative_inventory = 1},
		on_timer = function(pos, elapsed)
			if not minetest.find_node_near(pos, 1, leaves) then
				minetest.remove_node(pos)
			elseif minetest.get_node_light(pos) < 13 then
				minetest.get_node_timer(pos):start(200)
			else
				minetest.set_node(pos, {name = node})
			end
		end
	})
end

-- apples
if regrowing_apples then
	add_fruit_regrowable("apple", "default:apple", "default:leaves")
end

-- ethereal
add_fruit_regrowable("banana","ethereal:banana", "ethereal:bananaleaves")
add_fruit_regrowable("coconut", "ethereal:coconut", "ethereal:palmleaves")
add_fruit_regrowable("goldapple", "ethereal:golden_apple", "ethereal:yellowleaves")
add_fruit_regrowable("lemon", "ethereal:lemon", "ethereal:lemon_leaves")
add_fruit_regrowable("olive", "ethereal:olive", "ethereal:olive_leaves")
add_fruit_regrowable("orange", "ethereal:orange", "ethereal:orange_leaves")

-- cool_trees TODO: add cacao
add_fruit_regrowable("cherry", "cherrytree:cherries", "cherrytree:blossom_leaves")
add_fruit_regrowable("chestnut", "chestnuttree:bur", "chestnuttree:leaves")
add_fruit_regrowable("clementine", "clementinetree:clementine", "clementinetree:leaves")
add_fruit_regrowable("persimmon", "ebony:persimmon", "ebony:leaves")
add_fruit_regrowable("coollemon", "lemontree:lemon", "lemontree:leaves")
add_fruit_regrowable("acorn", "oak:acorn", "oak:leaves")
add_fruit_regrowable("coolcoconut", "palm:coconut", "palm:leaves")
add_fruit_regrowable("plum", "plumtree:plum", "plumtree:leaves") -- TODO: fix param2: 1
add_fruit_regrowable("pomegranate", "pomegranate:pomegranate", "pomegranate:leaves")

-- moretrees
add_fruit_regrowable("moreacorn", "moretrees:acorn", "moretrees:oak_leaves")
add_fruit_regrowable("cedar_cone", "moretrees:cedar_cone", "moretrees:cedar_leaves")
add_fruit_regrowable("fir_cone", "moretrees:fir_cone", "moretrees:fir_leaves")
add_fruit_regrowable("spruce_cone", "moretrees:spruce_cone", "moretrees:spruce_leaves")