Generalize item destruction logic

API.md

@@ -22,6 +22,7 @@ This section explains all the used groups in this subgame.
 * `soil_sugarcane=1`: Sugar canes will grow on this near water
 * `soil_nether_wart=1`: Nether wart will grow on this
 * `disable_suffocation=1`: Disables suffocation for full solid cubes (1)
+* `destroys_items=1`: If an item happens to be *inside* this node, the item will be destroyed
 
 #### Footnotes
 

mods/CORE/mcl_core/nodes.lua

@@ -1198,7 +1198,7 @@ minetest.register_node("mcl_core:lava_flowing", {
 	liquid_range = 4,
 	damage_per_second = 4*2,
 	post_effect_color = {a=192, r=255, g=64, b=0},
-	groups = {lava=3, liquid=2, igniter=3, not_in_creative_inventory=1},
+	groups = {lava=3, liquid=2, igniter=3, destroys_items=1, not_in_creative_inventory=1},
 })
 
 minetest.register_node("mcl_core:lava_source", {
@@ -1234,7 +1234,7 @@ minetest.register_node("mcl_core:lava_source", {
 	damage_per_second = 4*2,
 	post_effect_color = {a=192, r=255, g=64, b=0},
 	stack_max = 64,
-	groups = {lava=3, liquid=2, igniter=3, not_in_creative_inventory=1},
+	groups = {lava=3, liquid=2, igniter=3, destroys_items=1, not_in_creative_inventory=1},
 })
 
 minetest.register_node("mcl_core:cobble", {

mods/ENTITIES/mcl_item_entity/init.lua

@@ -361,10 +361,14 @@ core.register_entity(":__builtin:item", {
 			return
 		end
 
-		-- Destroy item in lava and other igniters
+		-- Destroy item in lava or special nodes
 		local nn = node.name
-		if (minetest.registered_nodes[nn] and minetest.registered_nodes[nn].damage_per_second > 0) or nn == "maptools:igniter" then
-			minetest.sound_play("builtin_item_lava", {pos = self.object:getpos(), gain = 0.5})
+		local def = minetest.registered_nodes[nn]
+		if (def and def.groups and (def.groups.lava or def.groups.destroys_items == 1)) then
+			-- Special effect for lava
+			if def.groups.lava then
+				minetest.sound_play("builtin_item_lava", {pos = self.object:getpos(), gain = 0.5})
+			end
 			self.object:remove()
 			return
 		end