Let papyrus grow on roots (MTG), make crafting cheaper

additional_stuff/depends.txt

@@ -1 +1,2 @@
 default
+nodetest?

additional_stuff/init.lua

@@ -27,21 +27,20 @@ minetest.register_node(":nodetest:papyrus_roots", {
 	paramtype = "light",
 	is_ground_content = true,
 	liquids_pointable = true,
-	groups = {snappy=3,flammable=2},
+	groups = {snappy=3, flammable=2},
 	sounds = default.node_sound_leaves_defaults(),
 })
 
 minetest.register_craft({
 	output = 'nodetest:papyrus_roots',
 	recipe = {
-		{'default:papyrus', 'default:papyrus', 'default:papyrus'},
-		{'default:papyrus', 'default:papyrus', 'default:papyrus'},
-		{'default:papyrus', 'default:papyrus', 'default:papyrus'},
+		{'default:papyrus', 'default:papyrus'},
+		{'default:papyrus', 'default:papyrus'},
 	}
 })
 
 minetest.register_craft({
-	output = 'default:papyrus 9',
+	output = 'default:papyrus 4',
 	recipe = {
 		{'nodetest:papyrus_roots'},
 	}
@@ -50,8 +49,8 @@ minetest.register_craft({
 minetest.register_abm({
 	nodenames = {"nodetest:papyrus_roots"},
 	neighbors = {"group:water"},
-	interval = 50,
-	chance = 50,
+	interval = 14,
+	chance = 71,
 	action = function(pos, node)
 		pos.y = pos.y+1
 		if minetest.get_node(pos).name == "air" then
@@ -60,4 +59,41 @@ minetest.register_abm({
 	end,
 })
 
+local function grow_papyrus(pos, node)
+	pos.y = pos.y - 1
+	local name = minetest.get_node(pos).name
+	if name ~= "nodetest:papyrus_roots" then
+		return
+	end
+	if not minetest.find_node_near(pos, 3, {"group:water"}) then
+		return
+	end
+	pos.y = pos.y + 1
+	local height = 0
+	while node.name == "default:papyrus" and height < 4 do
+		height = height + 1
+		pos.y = pos.y + 1
+		node = minetest.get_node(pos)
+	end
+	if height == 4 or node.name ~= "air" then
+		return
+	end
+	if minetest.get_node_light(pos) < 13 then
+		return
+	end
+	minetest.set_node(pos, {name = "default:papyrus"})
+	return true
+end
+
+minetest.register_abm({
+	label = "Grow papyrus on roots",
+	nodenames = {"default:papyrus"},
+	neighbors = {"nodetest:papyrus_roots"},
+	interval = 14,
+	chance = 71,
+	action = function(...)
+		grow_papyrus(...)
+	end
+})
+
 end