Reduce dependencies of technic_chests

technic_chests was depending on the technic mod, for the top-level
"technic" table and the technic.swap_node function.  Resolve that by
sharing the top-level table and inlining the one use of the function.
It was also depending on technic_worldgen, for the definitions of
cast iron and wrought iron.  Make the use of cast iron conditional on
technic_worldgen, falling back to default "steel".  Change the use of
wrought iron to directly use default "steel", to which it is aliased
anyway.

technic_chests/copper_chest.lua

@@ -19,7 +19,7 @@ minetest.register_craft({
 minetest.register_craft({
 	output = 'technic:copper_locked_chest 1',
 	recipe = {
-		{'technic:wrought_iron_ingot'},
+		{'default:steel_ingot'},
 		{'technic:copper_chest'},
 	}
 })

technic_chests/depends.txt

@@ -1,6 +1,3 @@
 default
-technic
-technic_worldgen
 pipeworks
 intllib?
-

technic_chests/gold_chest.lua

@@ -20,7 +20,7 @@ minetest.register_craft({
 minetest.register_craft({
 	output = 'technic:gold_locked_chest',
 	recipe = {
-		{'technic:wrought_iron_ingot'},
+		{'default:steel_ingot'},
 		{'technic:gold_chest'},
 	}
 })

technic_chests/init.lua

@@ -4,6 +4,7 @@
 
 modpath = minetest.get_modpath("technic_chests")
 
+technic = technic or {}
 technic.chests = {}
 
 dofile(modpath.."/common.lua")

technic_chests/iron_chest.lua

@@ -1,26 +1,32 @@
+local cast_iron_ingot
+if minetest.get_modpath("technic_worldgen") then
+	cast_iron_ingot = "technic:cast_iron_ingot"
+else
+	cast_iron_ingot = "default:steel_ingot"
+end
 
 minetest.register_craft({
 	output = 'technic:iron_chest 1',
 	recipe = {
-		{'technic:cast_iron_ingot','technic:cast_iron_ingot','technic:cast_iron_ingot'},
-		{'technic:cast_iron_ingot','default:chest','technic:cast_iron_ingot'},
-		{'technic:cast_iron_ingot','technic:cast_iron_ingot','technic:cast_iron_ingot'},
+		{cast_iron_ingot,cast_iron_ingot,cast_iron_ingot},
+		{cast_iron_ingot,'default:chest',cast_iron_ingot},
+		{cast_iron_ingot,cast_iron_ingot,cast_iron_ingot},
 	}
 })
 
 minetest.register_craft({
 	output = 'technic:iron_locked_chest 1',
 	recipe = {
-		{'technic:cast_iron_ingot','technic:cast_iron_ingot','technic:cast_iron_ingot'},
-		{'technic:cast_iron_ingot','default:chest_locked','technic:cast_iron_ingot'},
-		{'technic:cast_iron_ingot','technic:cast_iron_ingot','technic:cast_iron_ingot'},
+		{cast_iron_ingot,cast_iron_ingot,cast_iron_ingot},
+		{cast_iron_ingot,'default:chest_locked',cast_iron_ingot},
+		{cast_iron_ingot,cast_iron_ingot,cast_iron_ingot},
 	}
 })
 
 minetest.register_craft({
 	output = 'technic:iron_locked_chest 1',
 	recipe = {
-		{'technic:wrought_iron_ingot'},
+		{'default:steel_ingot'},
 		{'technic:iron_chest'},
 	}
 })

technic_chests/mithril_chest.lua

@@ -19,7 +19,7 @@ minetest.register_craft({
 minetest.register_craft({
 	output = 'technic:mithril_locked_chest 1',
 	recipe = {
-		{'technic:wrought_iron_ingot'},
+		{'default:steel_ingot'},
 		{'technic:mithril_chest'},
 	}
 })

technic_chests/register.lua

@@ -49,7 +49,9 @@ end
 local function check_color_buttons(pos, meta, chest_name, fields)
 	for i = 1, 16 do
 		if fields["color_button"..i] then
-			technic.swap_node(pos, chest_name..colorid_to_postfix(i))
+			local node = minetest.get_node(pos)
+			node.name = chest_name..colorid_to_postfix(i)
+			minetest.swap_node(pos, node)
 			meta:set_string("color", i)
 			return
 		end

technic_chests/silver_chest.lua

@@ -19,7 +19,7 @@ minetest.register_craft({
 minetest.register_craft({
 	output = 'technic:silver_locked_chest',
 	recipe = {
-		{'technic:wrought_iron_ingot'},
+		{'default:steel_ingot'},
 		{'technic:silver_chest'},
 	}
 })