Register our block entities with DFU

This ensures that data fixers will be applied to items in these
inventories.

projects/common/src/main/java/dan200/computercraft/mixin/V1460Mixin.java

@@ -0,0 +1,53 @@
+// SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.mixin;
+
+import com.mojang.datafixers.DSL;
+import com.mojang.datafixers.schemas.Schema;
+import com.mojang.datafixers.types.templates.TypeTemplate;
+import dan200.computercraft.shared.ModRegistry;
+import dan200.computercraft.shared.peripheral.diskdrive.DiskDriveBlockEntity;
+import dan200.computercraft.shared.peripheral.printer.PrinterBlockEntity;
+import dan200.computercraft.shared.turtle.blocks.TurtleBlockEntity;
+import net.minecraft.util.datafix.fixes.References;
+import net.minecraft.util.datafix.schemas.V1460;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import java.util.Map;
+import java.util.function.Supplier;
+
+/**
+ * Register our item-contianing block entities.
+ *
+ * @see DiskDriveBlockEntity
+ * @see PrinterBlockEntity
+ * @see TurtleBlockEntity
+ */
+@Mixin(V1460.class)
+class V1460Mixin {
+    @Inject(at = @At("RETURN"), method = "registerBlockEntities")
+    @SuppressWarnings("UnusedMethod")
+    private void registerBlockEntities(Schema schema, CallbackInfoReturnable<Map<String, Supplier<TypeTemplate>>> ci) {
+        var map = ci.getReturnValue();
+
+        // Basic inventories
+        registerInventory(schema, map, ModRegistry.BlockEntities.TURTLE_NORMAL.id().toString());
+        registerInventory(schema, map, ModRegistry.BlockEntities.TURTLE_ADVANCED.id().toString());
+        registerInventory(schema, map, ModRegistry.BlockEntities.PRINTER.id().toString());
+
+        // Disk drives contain a single item
+        schema.register(map, ModRegistry.BlockEntities.DISK_DRIVE.id().toString(), () -> DSL.optionalFields(
+            "Item", References.ITEM_STACK.in(schema)
+        ));
+    }
+
+    @Shadow
+    protected static void registerInventory(Schema schema, Map<String, Supplier<TypeTemplate>> map, String name) {
+    }
+}

projects/common/src/main/resources/computercraft.mixins.json

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+{
+    "required": true,
+    "package": "dan200.computercraft.mixin",
+    "minVersion": "0.8",
+    "compatibilityLevel": "JAVA_17",
+    "injectors": {
+        "defaultRequire": 1
+    },
+    "mixins": [
+        "V1460Mixin"
+    ],
+    "refmap": "computercraft.refmap.json"
+}