Tong cooling/quenching recipes

Note that these are separate from the existing
recipes used elsewhere out of necessity.  Lode
also anneals faster when carried (it's exposed
to more air cooling).

docs/ideas.txt

@@ -207,25 +207,6 @@ IDEAS: Possible future additions/improvements to the game
 	- Footsteps?
 	- Can be used as a BUD
 
-- Lode tongs?
-	- Craft from bars/rods (or lode adzes?).
-	- Add an API to hot potato
-		- Scan for all hot potato items and produce a list of slot->bool
-		- If any items found with an on_hot_potato callback, pass them
-		  that list (and player, inv, etc) to be modified.
-	- If slot is marked "safe" then no hot potato if items are in
-	  a slot adjacent to tongs.
-	- If slot is not marked safe, mark it safe if tongs or any tool
-	  are wielded item.
-	- Unmark safe any slots that don't contain hot things after
-	  hot potato check.
-	- Will probably need to unify damage_touch into an API that checks
-	  for damage given a player and a stack.
-		- Check for hot potato.
-		- Check upon pickup for anti-lode-move-exploit.
-	- Reform rake recipes
-		- Maybe 2x adze -> tongs, 2x tongs -> rake?
-
 - Lux/lode ore in already-partly-dug cobble form in mapgen/ore?
 
 - Dungeon loot

mods/nc_api_craft/register_cook_abm.lua

@@ -32,6 +32,7 @@ local function playcookfx(pos, cookfx, sound, smokeqty, smoketime)
 		nodecore.smokefx(pos, smoketime, smokeqty)
 	end
 end
+nodecore.playcookfx = playcookfx
 
 local function inprogress(pos, data)
 	local meta = minetest.get_meta(data.node)

mods/nc_lode/tongs.lua

@@ -7,7 +7,7 @@ local math_floor, math_random
 
 local modname = minetest.get_current_modname()
 
-local tongs_holdable = nodecore.group_expand("group:lode_temper_hot", true)
+local hotlode = nodecore.group_expand("group:lode_temper_hot", true)
 
 nodecore.register_lode("tongs", {
 		type = "tool",
@@ -25,11 +25,12 @@ nodecore.register_lode("tongs", {
 
 			def.on_item_hotpotato = function(player, myslot, mystack, itemslot, itemstack, dtime)
 				-- only works on glowing lode things
-				if not tongs_holdable[itemstack:get_name()] then return end
+				if not hotlode[itemstack:get_name()] then return end
 
 				-- item must be adjacent to tongs in inventory
 				if myslot > itemslot + 1 or myslot < itemslot - 1 then return end
 
+				-- Apply tool wear/breakage.
 				local dwear = wrate * (dtime or 3)
 				dwear = math_floor(dwear) + (math_random() < (dwear - math_floor(dwear))
 					and 1 or 0)
@@ -85,3 +86,35 @@ nodecore.register_craft({
 			{name = modname .. ":rod_hot", count = 2}
 		}
 	})
+
+local function coolto(pos, stack, tempername)
+	local def = minetest.registered_items[stack:get_name()]
+	if not def then return end
+	local alt = def["lode_alt_" .. tempername]
+	if not alt then return end
+	nodecore.playcookfx(pos, true, "hiss", 80, 0.2)
+	stack:set_name(alt)
+	return stack
+end
+
+nodecore.register_aism({
+		label = "tong-carried lode cooling",
+		itemnames = {"group:lode_temper_hot"},
+		action = function(stack, data)
+			-- Don't conflict with cooking ABMs already operating on stack nodes
+			if data.node then return end
+
+			if nodecore.quenched(data.pos) then
+				return coolto(data.pos, stack, "tempered")
+			end
+
+			local meta = stack:get_meta()
+			local time = (meta:get_float("~annealtime") or 0) + 1
+			if time >= 60 then
+				return coolto(data.pos, stack, "annealed")
+			end
+			nodecore.playcookfx(data.pos, {smoke = true}, "", 2, 1)
+			meta:set_float("~annealtime", time)
+			return stack
+		end
+	})