properly remove entire fermenter and reformer after checking that they don't have contents; add an LBM to remove stranded top nodes

tubelib_addons1/fermenter.lua

@@ -198,20 +198,16 @@ minetest.register_node("tubelib_addons1:fermenter", {
 	end,
 
 	-- the fermenter needs 'on_dig' to be able to remove the upper node
-	on_dig = function(pos, node, puncher, pointed_thing)
+	on_dig = function(pos, node, player)
 		local meta = M(pos)
 		local inv = meta:get_inventory()
 		if inv:is_empty("dst") and inv:is_empty("src") then
-			minetest.node_dig(pos, node, puncher, pointed_thing)
+			State:on_dig_node(pos, node, player)
+			tubelib.remove_node(pos)
 			minetest.remove_node({x=pos.x, y=pos.y+1, z=pos.z})
 		end
 	end,
 
-	on_dig = function(pos, node, player)
-		State:on_dig_node(pos, node, player)
-		tubelib.remove_node(pos)
-	end,
-
 	on_rotate = screwdriver.disallow,
 	on_timer = keep_running,
 	on_receive_fields = on_receive_fields,

tubelib_addons1/init.lua

@@ -22,4 +22,5 @@ dofile(minetest.get_modpath("tubelib_addons1") .. '/funnel.lua')
 dofile(minetest.get_modpath("tubelib_addons1") .. "/pusher_fast.lua")
 dofile(minetest.get_modpath("tubelib_addons1") .. "/detector.lua")
 dofile(minetest.get_modpath("tubelib_addons1") .. '/chest.lua')
-dofile(minetest.get_modpath("tubelib_addons1") .. '/liquidsampler.lua')
+dofile(minetest.get_modpath("tubelib_addons1") .. '/liquidsampler.lua')
+dofile(minetest.get_modpath("tubelib_addons1") .. '/lbms.lua')

tubelib_addons1/lbms.lua

@@ -0,0 +1,36 @@
+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"},
+}
+
+-- 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)
+
+        if not node_under then
+            -- not loaded
+            return
+        end
+
+        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
+
+        minetest.remove_node(pos)
+    end
+})

tubelib_addons1/reformer.lua

@@ -198,16 +198,12 @@ minetest.register_node("tubelib_addons1:reformer", {
 		local meta = M(pos)
 		local inv = meta:get_inventory()
 		if inv:is_empty("dst") and inv:is_empty("src") then
-			minetest.node_dig(pos, node, puncher, pointed_thing)
+			State:on_dig_node(pos, node, puncher)
+			tubelib.remove_node(pos)
 			minetest.remove_node({x=pos.x, y=pos.y+1, z=pos.z})
 		end
 	end,
 
-	on_dig = function(pos, node, player)
-		State:on_dig_node(pos, node, player)
-		tubelib.remove_node(pos)
-	end,
-
 	on_rotate = screwdriver.disallow,
 	on_timer = keep_running,
 	on_receive_fields = on_receive_fields,