make mapgen stone to be dug in stages

mods/default_tweaks/init.lua

@@ -163,3 +163,4 @@ dofile(modpath.."/plantgrowspeeds.lua")
 dofile(modpath.."/biomeores.lua")
 dofile(modpath.."/minefilling.lua")
 dofile(modpath.."/morebedrock.lua")
+dofile(modpath.."/stonestagedig.lua")

mods/default_tweaks/stonestagedig.lua

@@ -0,0 +1,94 @@
+--add more stages to digging mapgen stone
+--skip stages for players that have "fresh" arms
+
+local storage = minetest.get_mod_storage()
+
+local stonestagetbl = minetest.deserialize(storage:get_string("stonestagetbl")) or {}
+local lastupdated = storage:get_int("stonestagelastupdated")
+if lastupdated == 0 then lastupdated = os.time() end
+
+local twostage = 240--at or below this you dig in two stages
+local threestage = 360--at or below this you dig in three stages
+local capstage = 480--you dont wear your arm out past this
+local ticktime = 180--you recover from digging one block every ticktime seconds
+
+local function updatestonestage()
+	local currenttime = os.time()
+	local addblocks = math.floor((currenttime-lastupdated)/ticktime)
+	local update = false
+	for name, amount in pairs(stonestagetbl) do
+		update = true
+		amount = amount - addblocks
+		if amount <= 0 then
+			stonestagetbl[name] = nil
+		else
+			stonestagetbl[name] = amount
+		end
+		minetest.chat_send_all(stonestagetbl[name] or 0)
+	end
+	if update then
+		storage:set_string("stonestagetbl", minetest.serialize(stonestagetbl))
+	end
+	lastupdated = currenttime
+	storage:set_int("stonestagelastupdated", lastupdated)
+	minetest.after(ticktime, updatestonestage)
+end
+updatestonestage()
+
+local stonedef = table.copy(minetest.registered_nodes["default:stone"])
+local stone_after_dig = function(pos, oldnode, oldmetadata, digger)
+	local newnodename
+	local name = digger:get_player_name()
+	if not name then return end
+	minetest.chat_send_all((stonestagetbl[name] or 0))
+	if not stonestagetbl[name] or stonestagetbl[name] <= twostage then
+		local stagetbl = {
+			["default_tweaks:stone"] = "default_tweaks:stone_3",
+			["default_tweaks:stone_1"] = "default_tweaks:stone_3",
+		}
+		newnodename = stagetbl[oldnode.name]
+	elseif stonestagetbl[name] <= threestage then
+		local stagetbl = {
+			["default_tweaks:stone"] = "default_tweaks:stone_1",
+			["default_tweaks:stone_1"] = "default_tweaks:stone_3",
+		}
+		newnodename = stagetbl[oldnode.name]
+	else
+		local stagetbl = {
+			["default_tweaks:stone"] = "default_tweaks:stone_1",
+			["default_tweaks:stone_1"] = "default_tweaks:stone_2",
+			["default_tweaks:stone_2"] = "default_tweaks:stone_3",
+		}
+		newnodename = stagetbl[oldnode.name]
+	end
+	if newnodename then
+		minetest.set_node(pos, {name = newnodename})
+	else--node was dug
+		stonestagetbl[name] = (stonestagetbl[name] or 0) + 1
+		if stonestagetbl[name] > capstage then
+			stonestagetbl[name] = capstage
+		else
+			--storage:set_string("stonestagetbl", minetest.serialize(stonestagetbl))--commented out to save resources
+		end
+	end
+end
+
+stonedef.node_dig_prediction = "default_tweaks:stone_1"
+stonedef.after_dig_node = stone_after_dig
+stonedef.drop = ""
+minetest.register_node("default_tweaks:stone", table.copy(stonedef))
+
+minetest.register_alias_force("mapgen_stone", "default_tweaks:stone")
+
+stonedef.tiles[1] = "default_stone.png^[crack:1:1"
+stonedef.node_dig_prediction = "default_tweaks:stone_2"
+minetest.register_node("default_tweaks:stone_1", table.copy(stonedef))
+
+stonedef.node_dig_prediction = "default_tweaks:stone_3"
+stonedef.tiles[1] = "default_stone.png^[crack:1:2"
+minetest.register_node("default_tweaks:stone_2", table.copy(stonedef))
+
+stonedef.node_dig_prediction = "air"
+stonedef.tiles[1] = "default_stone.png^[crack:1:3"
+stonedef.drop = "default:cobble"
+minetest.register_node("default_tweaks:stone_3", table.copy(stonedef))