regrowing_fruits/init.lua

local regrowing_bananas = minetest.settings:get_bool("regrowing_bananas", true)
local regrowing_coconuts = minetest.settings:get_bool("regrowing_coconuts", true)
local regrowing_goldapples = minetest.settings:get_bool("regrowing_goldapples", true)
local regrowing_oranges = minetest.settings:get_bool("regrowing_oranges", true)

-- override ethereal fruits
if regrowing_bananas then
        minetest.override_item("ethereal:banana", {
        	after_dig_node = function(pos, oldnode, oldmetadata, digger)
        		if oldnode.param2 == 0 then
        			minetest.set_node(pos, {name = "regrowing_fruits:banana_mark"})
        			minetest.get_node_timer(pos):start(math.random(300, 1500))
        		end
        	end,
        })
end

if regrowing_coconuts then
        minetest.override_item("ethereal:coconut", {
        	after_dig_node = function(pos, oldnode, oldmetadata, digger)
        		if oldnode.param2 == 0 then
        			minetest.set_node(pos, {name = "regrowing_fruits:coconut_mark"})
        			minetest.get_node_timer(pos):start(math.random(300, 1500))
        		end
        	end,
        })
end

if regrowing_goldapples then
        minetest.override_item("ethereal:golden_apple", {
        	after_dig_node = function(pos, oldnode, oldmetadata, digger)
        		if oldnode.param2 == 0 then
        			minetest.set_node(pos, {name = "regrowing_fruits:goldapple_mark"})
        			minetest.get_node_timer(pos):start(math.random(300, 1500))
        		end
        	end,
        })
end

if regrowing_oranges then
        minetest.override_item("ethereal:orange", {
        	after_dig_node = function(pos, oldnode, oldmetadata, digger)
        		if oldnode.param2 == 0 then
        			minetest.set_node(pos, {name = "regrowing_fruits:orange_mark"})
        			minetest.get_node_timer(pos):start(math.random(300, 1500))
        		end
        	end,
        })
end

-- air nodes to mark fruit pos
minetest.register_node("regrowing_fruits:banana_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, "ethereal:bananaleaves")
                or not regrowing_bananas 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 = "ethereal:banana"})
		end
	end
})

minetest.register_node("regrowing_fruits:coconut_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, "ethereal:palmleaves")
                or not regrowing_coconuts 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 = "ethereal:coconut"})
		end
	end
})

minetest.register_node("regrowing_fruits:goldapple_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, "ethereal:yellowleaves")
                or not regrowing_goldapples then
			minetest.remove_node(pos)
                elseif not regrowing_goldapples then
                        return
		elseif minetest.get_node_light(pos) < 13 then
			minetest.get_node_timer(pos):start(200)
		else 
			minetest.set_node(pos, {name = "ethereal:golden_apple"})
		end
	end
})

minetest.register_node("regrowing_fruits:orange_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, "ethereal:orange_leaves")
                or not regrowing_oranges 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 = "ethereal:orange"})
		end
	end
})