Ignite TNT by fire

mods/ITEMS/mcl_fire/init.lua

@@ -132,14 +132,19 @@ minetest.register_node("mcl_fire:fire", {
 					end
 				end
 			else
-				-- Replace flammable node with fire
+				-- Burn flammable block
 				local nodes = minetest.find_nodes_in_area({x=pos.x-1, y=pos.y-1, z=pos.z-1}, {x=pos.x+1, y=pos.y+4, z=pos.z+1}, {"group:flammable"})
 				if #nodes > 0 then
 					local r = math.random(1, #nodes)
+					local ndef = minetest.registered_nodes[minetest.get_node(nodes[r]).name]
+					if ndef and ndef._on_burn then
+						ndef._on_burn(nodes[r])
+					else
 						spawn_fire(nodes[r], age_next)
 					end
 				end
 			end
+		end
 		-- Regular age increase
 		if age + age_add <= 15 then
 			node.param2 = age + age_add

mods/ITEMS/mcl_tnt/init.lua

@@ -67,7 +67,7 @@ minetest.register_node("mcl_tnt:tnt", {
 	_tt_help = S("Ignited by tools, explosions, fire, lava, redstone power").."\n"..S("Explosion radius: @1", tostring(TNT_RANGE)),
 	_doc_items_longdesc = longdesc,
 	_doc_items_usagehelp = S("Place the TNT and ignite it with one of the methods above. Quickly get in safe distance. The TNT will start to be affected by gravity and explodes in 4 seconds."),
-	groups = { dig_immediate = 3, tnt = 1, enderman_takable=1 },
+	groups = { dig_immediate = 3, tnt = 1, enderman_takable=1, flammable=-1 },
 	mesecons = tnt_mesecons,
 	on_blast = function(pos)
 	        local e = spawn_tnt(pos, "mcl_tnt:tnt")
@@ -78,6 +78,10 @@ minetest.register_node("mcl_tnt:tnt", {
 		tnt.ignite(pointed_thing.under)
 		return true
 	end,
+	_on_burn = function(pos)
+		tnt.ignite(pos)
+		return true
+	end,
 	_on_dispense = function(stack, pos, droppos, dropnode, dropdir)
 		-- Place and ignite TNT
 		if minetest.registered_nodes[dropnode.name].buildable_to then