add a method other mods can use to create hot rock variants easily

hot_rock.lua

@@ -3,32 +3,6 @@ if magma_conduits.config.glowing_rock then
 local modpath = minetest.get_modpath(minetest.get_current_modname())
 local S, NS = dofile(modpath.."/intllib.lua")
 
-minetest.register_node("magma_conduits:hot_cobble", {
-	description = S("Hot Cobble"),
-	_doc_items_longdesc = S("Hot stone riven with cracks and seeping traces of lava."),
-	_doc_items_usagehelp = S("When normal stone is heated by lava it is converted into this. Beware when digging here!"),
-	tiles = {"magma_conduits_hot_cobble.png"},
-	is_ground_content = false,
-	groups = {cracky = 3, stone = 2, lava_heated=1},
-	_magma_conduits_cools_to = "default:cobble",
-	sounds = default.node_sound_stone_defaults(),
-	light_source = 6,
-	drop = "default:cobble",
-})
-
-minetest.register_node("magma_conduits:glow_obsidian", {
-	description = S("Hot Obsidian"),
-	_doc_items_longdesc = S("Obsidian heated to a dull red glow."),
-	_doc_items_usagehelp = S("When normal obsidian is heated by lava it is converted into this. Beware when digging here!"),
-	tiles = {"magma_conduits_glow_obsidian.png"},
-	is_ground_content = true,
-	sounds = default.node_sound_stone_defaults(),
-	groups = {cracky=1, lava_heated=1, level=2},
-	_magma_conduits_cools_to = "default:obsidian",
-	light_source = 6,
-	drop = "default:obsidian",
-})
-
 local simple_copy
 simple_copy = function(t)
 	local r = {}
@@ -42,6 +16,56 @@ simple_copy = function(t)
 	return r
 end
 
+magma_conduits.make_hot_node_def = function(name, original_def)
+	original_def.groups = original_def.groups or {}
+	local hot_node_def = simple_copy(original_def)
+
+	local hot_name = name .. "_glowing"
+	original_def.groups.lava_heatable = 1
+	original_def._magma_conduits_heats_to = hot_name
+	
+	hot_node_def.groups.lava_heated = 1
+	hot_node_def.groups.not_in_creative_inventory = 1
+	hot_node_def._magma_conduits_cools_to = name
+	hot_node_def.description = S("Hot @1", hot_node_def.description)
+	
+	for k, v in ipairs(hot_node_def.tiles) do
+		hot_node_def.tiles[k] = v .. "^magma_conduits_lava_overlay.png"
+	end
+	hot_node_def.light_source = 6
+	if hot_node_def.drop == nil then
+		hot_node_def.drop = name
+	end
+	
+	return hot_name, hot_node_def
+end
+
+minetest.register_node("magma_conduits:hot_cobble", {
+	description = S("Hot Cobble"),
+	_doc_items_longdesc = S("Hot stone riven with cracks and seeping traces of lava."),
+	_doc_items_usagehelp = S("When normal stone is heated by lava it is converted into this. Beware when digging here!"),
+	tiles = {"magma_conduits_hot_cobble.png"},
+	is_ground_content = false,
+	groups = {cracky = 3, stone = 2, lava_heated=1, not_in_creative_inventory=1},
+	_magma_conduits_cools_to = "default:cobble",
+	sounds = default.node_sound_stone_defaults(),
+	light_source = 6,
+	drop = "default:cobble",
+})
+
+minetest.register_node("magma_conduits:glow_obsidian", {
+	description = S("Hot Obsidian"),
+	_doc_items_longdesc = S("Obsidian heated to a dull red glow."),
+	_doc_items_usagehelp = S("When normal obsidian is heated by lava it is converted into this. Beware when digging here!"),
+	tiles = {"magma_conduits_glow_obsidian.png"},
+	is_ground_content = true,
+	sounds = default.node_sound_stone_defaults(),
+	groups = {cracky=1, lava_heated=1, level=2, not_in_creative_inventory=1},
+	_magma_conduits_cools_to = "default:obsidian",
+	light_source = 6,
+	drop = "default:obsidian",
+})
+
 -- can't use minetest.override_item to change group memberships here due to issue https://github.com/minetest/minetest/issues/5518
 
 local make_heatable = function(nodename, heats_to)

textures/license.txt

@@ -1,3 +1,7 @@
 The following are from the Caverealms mod by HeroOfTheWinds, licensed under the WTFPL:
 
 magma_conduits_hot_cobble.png
+
+The following is derived from the default mod under the Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0):
+
+magma_conduits_lava_overlay.png