Initial commit

depends.txt

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+protector

init.lua

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+local function is_mapblock_grid_pos(pos)
+    return (pos.x % 16 == 0) and (pos.y % 16 == 0) and (pos.z % 16 == 0)
+end
+
+minetest.register_on_placenode(function(pos, newnode, placer)
+    if newnode.name ~= "protector:protect" then
+        return
+    end
+
+    if is_mapblock_grid_pos(pos) then
+        return
+    end
+
+    minetest.remove_node(pos)
+
+    if placer and placer:is_player() then
+        local player_name = placer:get_player_name()
+
+        if not minetest.is_creative_enabled(player_name) then
+            local refund = ItemStack("protector:protect")
+            local inv = placer:get_inventory()
+
+            if inv and inv:room_for_item("main", refund) then
+                inv:add_item("main", refund)
+            else
+                minetest.add_item(vector.offset(pos, 0, 1, 0), refund)
+            end
+        end
+
+        minetest.chat_send_player(
+            player_name,
+            "Protector placement failed: place only at coordinates divisible by 16."
+        )
+    end
+end)

mod.conf

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+name = protected_mapblock_grid
+description = Places protector blocks at every 16-node mapblock corner
+author = ermeehan
+version = 1.0.0