Fix Java lighting for 1.14+

amulet/level/formats/anvil_world/format.py

@@ -495,14 +495,14 @@ def pre_save_operation(
         except StopIteration as e:
             height_changed = e.value
 
-        # light = self._calculate_light(level, changed_chunks)
-        # try:
-        #     while True:
-        #         yield next(light) / 2
-        # except StopIteration as e:
-        #     light_changed = e.value
+        light = self._calculate_light(level, changed_chunks)
+        try:
+            while True:
+                yield next(light) / 2
+        except StopIteration as e:
+            light_changed = e.value
 
-        return height_changed  # or light_changed
+        return height_changed or light_changed
 
     @staticmethod
     def _calculate_height(
@@ -553,6 +553,7 @@ def _calculate_light(
                     changed_ = False
                     changed_ |= chunk.misc.pop("block_light", None) is not None
                     changed_ |= chunk.misc.pop("sky_light", None) is not None
+                    changed_ |= chunk.misc.pop("isLightOn", None)
                     if changed_:
                         changed = True
                         chunk.changed = True

amulet/level/interfaces/chunk/anvil/anvil_1934.py

@@ -1,5 +1,14 @@
 from __future__ import annotations
 
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from amulet.api.chunk import Chunk
+
+from amulet_nbt import CompoundTag, ByteTag
+
+from .base_anvil_interface import ChunkDataType, ChunkPathType
+
 from .anvil_1912 import Anvil1912Interface as ParentInterface
 
 
@@ -8,13 +17,34 @@ class Anvil1934Interface(ParentInterface):
     Made lighting optional
     """
 
+    isLightOn: ChunkPathType = (
+        "region",
+        [("Level", CompoundTag), ("isLightOn", ByteTag)],
+        ByteTag,
+    )
+
     def __init__(self):
         super().__init__()
         self._set_feature("light_optional", "true")
+        self._register_encoder(self._encode_is_light_on)
+        self._register_decoder(self._decode_is_light_on)
 
     @staticmethod
     def minor_is_valid(key: int):
         return 1934 <= key < 2203
 
+    def _decode_is_light_on(
+        self, chunk: Chunk, data: ChunkDataType, floor_cy: int, height_cy: int
+    ):
+        chunk.misc["isLightOn"] = self.get_layer_obj(
+            data, self.isLightOn, pop_last=True
+        )
+
+    def _encode_is_light_on(
+        self, chunk: Chunk, data: ChunkDataType, floor_cy: int, height_cy: int
+    ):
+        is_light_on = bool(chunk.misc.pop("isLightOn", None))
+        self.set_layer_obj(data, self.isLightOn, ByteTag(is_light_on))
+
 
 export = Anvil1934Interface

amulet/level/interfaces/chunk/anvil/anvil_2844.py

@@ -57,7 +57,7 @@ class Anvil2844Interface(ParentInterface):
     OldLevel: ChunkPathType = ("region", [("Level", CompoundTag)], CompoundTag)
     Level: ChunkPathType = ("region", [], CompoundTag)
     Sections: ChunkPathType = ("region", [("sections", ListTag)], ListTag)
-
+    isLightOn: ChunkPathType = ("region", [("isLightOn", ByteTag)], ByteTag)
     Entities: ChunkPathType = ("region", [("entities", ListTag)], ListTag)
     BlockEntities: ChunkPathType = ("region", [("block_entities", ListTag)], ListTag)
     BlockTicks: ChunkPathType = ("region", [("block_ticks", ListTag)], ListTag)