regrowing_fruits/init.lua

local add_fruit_regrowable = function(fruit, node, leaves)

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

	-- make sure cacao pod from cool_trees isn't placed by player
	if node == "cacaotree:pod" then
		minetest.register_node("regrowing_fruits:cacao", {
			description = "Cacao Pod",
			drawtype = "nodebox",
			tiles = {
				"cacaotree_bean_top.png",
				"cacaotree_bean_top.png^[transformFY",
				"cacaotree_bean_right.png",
				"cacaotree_bean_right.png^[transformFX",
				"cacaotree_bean_front.png",
			},
			paramtype = "light",
			paramtype2 = "wallmounted",
			node_box = {
				type = "fixed",
				fixed = {
					{-0.25, -0.5, 0, 0.25, 0.0625, 0.5},
				},
			},
			use_texture_alpha = "clip",
			drop = "cacaotree:cacao_beans 10",
			groups = {fleshy = 3, dig_immediate = 3, flammable = 2,
					  leafdecay = 3, leafdecay_drop = 1, not_in_creative_inventory = 1},
			sounds = default.node_sound_leaves_defaults(),
			walkable = false,
			is_ground_content = false,
		})

		minetest.register_on_placenode(function(pos, newnode, placer)
			if placer:is_player() and newnode.name == "cacaotree:pod" then
				minetest.set_node(pos, {name = "regrowing_fruits:cacao", param2 = newnode.param2})
			end
		end)
	end

	local groups = node.groups
	if minetest.get_item_group(node, "attached_node") == 1 then
		if node == "default:apple" then
			groups = {fleshy = 3, dig_immediate = 3, flammable = 2, leafdecay = 3, leafdecay_drop = 1, food_apple = 1}
		else
			groups = {fleshy=3, dig_immediate=3, flammable=2, leafdecay = 1, leafdecay_drop = 1}
		end
	end

	-- override fruit
	minetest.override_item(node, {
		groups = groups, -- make sure (moretrees) fruits don't fall on dig
		after_place_node = function(pos, placer) -- make sure (moretrees and plumtree) fruits aren't placed by player
			if placer:is_player() and node == "plumtree:plum" then
				minetest.set_node(pos, {name = node, param2 = 0})
			elseif placer:is_player() then
				minetest.set_node(pos, {name = node, param2 = 1})
			end
		end,
		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 and oldnode.name ~= "plumtree:plum"
					or oldnode.name == "plumtree:plum" and oldnode.param2 == 1
					or oldnode.name == "cacaotree:pod" then
				minetest.set_node(pos, {name = "regrowing_fruits:"..fruit.."_mark", param2 = oldnode.param2})
				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, param2 = minetest.get_node(pos).param2})
			end
		end
	})
end

-- apples
add_fruit_regrowable("apple", "default:apple", "default:leaves")

-- 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
add_fruit_regrowable("cacao", "cacaotree:pod", "cacaotree:trunk") -- use trunk instead of leaves
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")
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")

-- farming_plus
add_fruit_regrowable("cocoa", "farming_plus:cocoa", "farming_plus:cocoa_leaves")
add_fruit_regrowable("banana_plus", "farming_plus:banana", "farming_plus:banana_leaves")