From 0c929b227865ea5b22eba3c565d6b55e8e06ce25 Mon Sep 17 00:00:00 2001
From: flux <25628292+fluxionary@users.noreply.github.com>
Date: Sat, 22 Aug 2020 18:07:18 +0000
Subject: [PATCH] add LBM to re-place tops of missing multiblocks

---
 tubelib_addons1/lbms.lua | 85 +++++++++++++++++++++++++++-------------
 1 file changed, 58 insertions(+), 27 deletions(-)

diff --git a/tubelib_addons1/lbms.lua b/tubelib_addons1/lbms.lua
index ea4df9e..7816fbf 100644
--- a/tubelib_addons1/lbms.lua
+++ b/tubelib_addons1/lbms.lua
@@ -1,36 +1,67 @@
-local bottoms_by_node = {
-    ["tubelib_addons1:fermenter_top"] = {"tubelib_addons1:fermenter", "tubelib_addons1:fermenter_defect"},
-    ["tubelib_addons1:reformer_top"] = {"tubelib_addons1:reformer", "tubelib_addons1:reformer_defect"},
+local bottoms_by_top = {
+	["tubelib_addons1:fermenter_top"] = {"tubelib_addons1:fermenter", "tubelib_addons1:fermenter_defect"},
+	["tubelib_addons1:reformer_top"] = {"tubelib_addons1:reformer", "tubelib_addons1:reformer_defect"},
+}
+
+local top_by_bottom = {
+	["tubelib_addons1:fermenter"] = "tubelib_addons1:fermenter_top",
+	["tubelib_addons1:fermenter_defect"] = "tubelib_addons1:fermenter_top",
+	["tubelib_addons1:reformer"] = "tubelib_addons1:reformer_top",
+	["tubelib_addons1:reformer_defect"] = "tubelib_addons1:reformer_top",
 }
 
 -- remove tops of multiblocks which aren't over the bottom; happens due to bugs or worldedit
 minetest.register_lbm({
-    label = "Remove detached tops of multiblocks",
-    name = "tubelib_addons1:remove_detached_tops",
-    nodenames = {
-        "tubelib_addons1:fermenter_top",
-        "tubelib_addons1:reformer_top",
-    },
-    run_at_every_load = true,
-    action = function(pos, node)
-        local bottoms = bottoms_by_node[node.name]
-        local pos_under = vector.subtract(pos, vector.new(0, 1, 0))
-        local node_under = minetest.get_node_or_nil(pos_under)
+	label = "Remove detached tops of multiblocks",
+	name = "tubelib_addons1:remove_detached_tops",
+	nodenames = {
+		"tubelib_addons1:fermenter_top",
+		"tubelib_addons1:reformer_top",
+	},
+	run_at_every_load = true,
+	action = function(pos, node)
+		local bottoms = bottoms_by_top[node.name]
+		local pos_under = vector.subtract(pos, vector.new(0, 1, 0))
+		local node_under = minetest.get_node_or_nil(pos_under)
 
-        if not node_under then
-            -- not loaded
-            return
-        end
+		if not node_under then
+			-- not loaded
+			return
+		end
 
-        local node_under_name = node_under.name
+		local node_under_name = node_under.name
 
-        for _, bottom in ipairs(bottoms) do
-            if node_under_name == bottom then
-                -- has an acceptable bottom
-                return
-            end
-        end
+		for _, bottom in ipairs(bottoms) do
+			if node_under_name == bottom then
+				-- has an acceptable bottom
+				return
+			end
+		end
 
-        minetest.remove_node(pos)
-    end
+		minetest.remove_node(pos)
+	end
+})
+
+-- fix multiblocks with missing tops; happens due to bugs or worldedit
+minetest.register_lbm({
+	label = "Fix missing tops of multiblocks",
+	name = "tubelib_addons1:fix_missing_tops",
+	nodenames = {
+		"tubelib_addons1:fermenter",
+		"tubelib_addons1:fermenter_defect",
+		"tubelib_addons1:reformer",
+		"tubelib_addons1:reformer_defect",
+	},
+	run_at_every_load = true,
+	action = function(pos, node)
+		local pos_above = vector.add(pos, vector.new(0, 1, 0))
+		local node_above = minetest.get_node(pos_above)
+
+		if node_above.name ~= "air" then
+			return
+		end
+
+		local top = top_by_bottom[node.name]
+		minetest.add_node(pos_above, {name=top, param2=node.param2})
+	end
 })