remove complicated diffing/patching mechanism

init.lua

@@ -34,15 +34,10 @@ dofile(MP.."/deserialize_mapblock.lua")
 dofile(MP.."/localize_nodeids.lua")
 dofile(MP.."/functions.lua")
 
--- diff / patch
-dofile(MP.."/create_diff.lua")
-dofile(MP.."/apply_diff.lua")
-loadfile(MP.."/patch.lua")(global_env)
-
 -- save/load
 dofile(MP.."/auto_save.lua")
 dofile(MP.."/auto_update.lua")
-loadfile(MP.."/save.lua")(global_env)
+dofile(MP.."/save.lua")
 loadfile(MP.."/data.lua")(global_env)
 dofile(MP.."/load.lua")
 dofile(MP.."/mapgen.lua")
@@ -77,8 +72,6 @@ if minetest.get_modpath("mtt") and mtt.enabled then
 	dofile(MP.."/init.spec.lua")
 	dofile(MP.."/functions.spec.lua")
 	dofile(MP.."/data.spec.lua")
-	dofile(MP.."/diff.spec.lua")
-	dofile(MP.."/patch.spec.lua")
 	dofile(MP.."/api.spec.lua")
 	dofile(MP.."/serialize_chunk.spec.lua")
 end

load.lua

@@ -5,36 +5,5 @@ function mapsync.load(chunk_pos, vmanip)
         return true, "No backend available"
     end
 
-    -- load baseline chunk (might be non-existent)
     mapsync.deserialize_chunk(chunk_pos, mapsync.get_chunk_zip_path(backend_def.path, chunk_pos), vmanip)
-
-    if backend_def.patch_path then
-        -- load diff
-        local f = io.open(mapsync.get_chunk_json_path(backend_def.patch_path, chunk_pos), "r")
-        if not f then
-            -- no diff
-            return true
-        end
-
-        local changed_nodes = {}
-        for line in f:lines() do
-            local changed_node = minetest.parse_json(line)
-            if changed_node then
-                table.insert(changed_nodes, changed_node)
-            end
-        end
-        f:close()
-
-        -- apply diff
-        local success, msg = mapsync.apply_diff(chunk_pos, changed_nodes)
-        if not success then
-            return false, msg
-        end
-
-        -- fix lighting
-        local mb_pos1, mb_pos2 = mapsync.get_mapblock_bounds_from_chunk(chunk_pos)
-        local pos1 = mapsync.get_node_bounds_from_mapblock(mb_pos1)
-        local _, pos2 = mapsync.get_node_bounds_from_mapblock(mb_pos2)
-        minetest.fix_light(pos1, pos2)
-    end
 end