_on_ignite, +eternal fire when igniting netherrack

mods/ITEMS/mcl_fire/depends.txt

@@ -1,2 +1,3 @@
 mcl_core
 mcl_sounds
+mcl_nether?

mods/ITEMS/mcl_fire/flint_and_steel.lua

@@ -13,22 +13,22 @@ minetest.register_tool("mcl_fire:flint_and_steel", {
 			"fire_flint_and_steel",
 			{pos = pointed_thing.above, gain = 0.5, max_hear_distance = 8}
 		)
+		local used = false
 		if pointed_thing.type == "node" then
-			if minetest.get_node(pointed_thing.under).name == "mcl_tnt:tnt" then
-				tnt.ignite(pointed_thing.under)
-				if not minetest.setting_getbool("creative_mode") then
-					itemstack:add_wear(65535/65) -- 65 uses
-				end
+			local nodedef = minetest.registered_nodes[minetest.get_node(pointed_thing.under).name]
+			if nodedef._on_ignite then
+				nodedef._on_ignite(pointed_thing.under, user)
 			else
 				mcl_fire.set_fire(pointed_thing)
-				if not minetest.setting_getbool("creative_mode") then
-					itemstack:add_wear(65535/65) -- 65 uses
-				end
 			end
+			used = true
 		end
 		if itemstack:get_count() == 0 and idef.sound and idef.sound.breaks then
 			minetest.sound_play(idef.sound.breaks, {pos=user:getpos(), gain=0.5})
 		end
+		if not minetest.setting_getbool("creative_mode") and used == true then
+			itemstack:add_wear(65535/65) -- 65 uses
+		end
 		return itemstack
 	end,
 	sound = { breaks = "default_tool_breaks" },

mods/ITEMS/mcl_fire/init.lua

@@ -291,7 +291,28 @@ else -- Fire enabled
 
 end
 
--- Set pointed_thing on fire
+-- Spawn eternal fire when using flint and steel on netherrack
+
+local eternal_override = {
+	after_destruct = function(pos, oldnode)
+		pos.y = pos.y + 1
+		if minetest.get_node(pos).name == "mcl_fire:eternal_fire" then
+			minetest.remove_node(pos)
+		end
+	end,
+	_on_ignite = function(pos, player)
+		local flame_pos = {x = pos.x, y = pos.y + 1, z = pos.z}
+		if minetest.get_node(flame_pos).name == "air" then
+			minetest.set_node(flame_pos, {name = "mcl_fire:eternal_fire"})
+		end
+	end,
+}
+
+if minetest.get_modpath("mcl_nether") then
+	minetest.override_item("mcl_nether:netherrack", eternal_override)
+end
+
+-- Set pointed_thing on (normal) fire
 mcl_fire.set_fire = function(pointed_thing)
 	local n = minetest.get_node(pointed_thing.above)
 	if n.name ~= ""  and n.name == "air" and not minetest.is_protected(pointed_thing.above, "fire") then

mods/ITEMS/mcl_tnt/init.lua

@@ -54,6 +54,9 @@ minetest.register_node("mcl_tnt:tnt", {
 	mesecons = {effector = {
 		action_on = tnt.ignite
 	}},
+	_on_ignite = function(pos, player)
+		tnt.ignite(pos)
+	end,
 	sounds = mcl_sounds.node_sound_wood_defaults(),
 })