Move scan_queue to local scope

init.lua

@@ -5,7 +5,6 @@ local modpath = minetest.get_modpath("cartographer");
 
 -- The API object
 cartographer = {
-    scan_queue = {},
 };
 
 local map_data = {

scanner.lua

@@ -2,6 +2,8 @@
 -- map_data: The cartographer map data table
 local map_data, chunk = ...;
 
+local scan_queue = {};
+
 -- Register a new tile in map data
 -- x: The x position in map coordinates
 -- y: The y position in map coordinates
@@ -172,24 +174,24 @@ function cartographer.queue_region(pos)
         return;
     end
 
-    for _,queued_pos in ipairs(cartographer.scan_queue) do
+    for _,queued_pos in ipairs(scan_queue) do
         if vector.equals(converted, queued_pos) then
             return;
         end
     end
 
-    cartographer.scan_queue[#cartographer.scan_queue + 1] = converted;
+    scan_queue[#scan_queue + 1] = converted;
 end
 
 -- Scan the next tile on the queue, and remove it
 function cartographer.scan_regions()
-    local len = #cartographer.scan_queue;
+    local len = #scan_queue;
 
     if len == 0 then
         return;
     end
 
-    local startpos = cartographer.scan_queue[1];
+    local startpos = scan_queue[1];
     local chunk_x = chunk.to(startpos.x);
     local chunk_y = chunk.to(startpos.y);
     local chunk_z = chunk.to(startpos.z);
@@ -201,7 +203,7 @@ function cartographer.scan_regions()
     };
 
     if is_scan_handled(chunk_x, startpos.y, chunk_z) then
-        table.remove(cartographer.scan_queue, 1);
+        table.remove(scan_queue, 1);
         return;
     end
 
@@ -210,7 +212,7 @@ function cartographer.scan_regions()
         register_tile(chunk_x, chunk_z, biome, height, true)
     end
 
-    table.remove(cartographer.scan_queue, 1);
+    table.remove(scan_queue, 1);
 end
 
 minetest.register_on_generated(on_generated);