Re-add functionality to clean nodes:

Nodes to clean can be listed in 'clean_nodes.txt' file in world path.

README.md

@@ -4,7 +4,7 @@
 ---
 ### **Description:**
 
-Fork of [PilzAdam's ***clean*** mod][f.pilzadam] for Minetest.
+A simple Minetest mod that can be used to remove unknown entities & nodes. Forked from [PilzAdam's ***clean*** mod][f.pilzadam].
 
 
 ---

description.txt

@@ -1 +1 @@
-A simple mod that can be used to remove unknown entities.
+A simple mod that can be used to remove unknown entities & nodes.

init.lua

@@ -19,6 +19,8 @@ local function logDebug(msg)
 end
 
 
+-- ENTITIES
+
 local old_entities = {}
 
 -- Populate entities list from file in world path
@@ -54,3 +56,47 @@ for _, entity_name in ipairs(old_entities) do
         end,
     })
 end
+
+
+-- NODES
+
+local old_nodes = {}
+
+-- Populate nodes list from file in world path
+local n_list = nil
+local n_path = core.get_worldpath() .. '/clean_nodes.txt'
+local n_file = io.open(n_path, 'r')
+if n_file then
+	n_list = n_file:read('*a')
+	n_file:close()
+else
+	-- Create empty file
+	n_file = io.open(n_path, 'w')
+	if n_file then
+		n_file:close()
+	end
+end
+
+if n_list then
+	logDebug('Loading nodes to clean from file ...')
+	
+	n_list = string.split(n_list, '\n')
+	for _, node_name in ipairs(n_list) do
+		table.insert(old_nodes, node_name)
+	end
+end
+
+for _, node_name in ipairs(old_nodes) do
+    core.register_node(':' .. node_name, {
+        groups = {old=1},
+    })
+end
+
+core.register_abm({
+    nodenames = {'group:old'},
+    interval = 1,
+    chance = 1,
+    action = function(pos, node)
+        core.remove_node(pos)
+    end,
+})