Merge branch 'mc-1.20.x' into mc-1.21.x

We use getLevel() specifically for reading the current registries
(and/or server). We don't need the exact position of the speaker to
query this, so add a dedicated method for it.

We actually had a similar method on 1.21.7 already for upgrades. This
just moves it to SpeakerPeripheral.

Fixes #2236.

.editorconfig

@@ -27,7 +27,7 @@ indent_size = 2
 [*.yml]
 indent_size = 2
 
-[{*.kt,*.kts}]
+[*.{kt,kts}]
 ij_kotlin_code_style_defaults = KOTLIN_OFFICIAL
 ij_kotlin_continuation_indent_size = 4
 ij_kotlin_spaces_around_equality_operators = true
@@ -39,3 +39,14 @@ ij_kotlin_allow_trailing_comma_on_call_site = true
 ij_kotlin_method_parameters_wrap = off
 ij_kotlin_call_parameters_wrap = off
 ij_kotlin_extends_list_wrap = off
+
+ktlint_code_style = intellij_idea
+ktlint_standard_class-naming = disabled
+ktlint_standard_class-signature = disabled
+ktlint_standard_function-naming = disabled
+ktlint_standard_no-wildcard-imports = disabled
+
+# FIXME: These two are disable right now as they're over-eager in putting things
+#  on the same line. We should set max_line_length and handle this properly.
+ktlint_standard_function-signature = disabled
+ktlint_standard_function-expression-body = disabled

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -11,7 +11,8 @@ body:
         What version of Minecraft are you using? If your version is not listed, please try to reproduce on one of the supported versions.
     options:
       - 1.20.1
-      - 1.21.x
+      - 1.21.1
+      - 1.21.7
   validations:
     required: true
 - type: input

CONTRIBUTING.md

@@ -88,8 +88,8 @@ You'll first need to [set up a development environment as above](#setting-up-a-d
 
 Once this is set up, you can now run `./gradlew docWebsite`. This generates documentation from our Lua and Java code,
 writing the resulting HTML into `./projects/web/build/site`, which can then be opened in a browser. When iterating on
-documentation, you can instead run `./gradlew docWebsite -t`, which will rebuild documentation every time you change a
-file.
+documentation, you can instead run `./gradlew :web:assemble -x :web:compileTeaVM -t`, which will rebuild documentation
+every time you change a file.
 
 Documentation is built using [illuaminate] which, while not currently documented (somewhat ironic), is largely the same
 as [ldoc][ldoc]. Documentation comments are written in Markdown, though note that we do not support many GitHub-specific

buildSrc/src/main/kotlin/cc-tweaked.forge.gradle.kts

@@ -6,7 +6,6 @@
 
 import cc.tweaked.gradle.CCTweakedExtension
 import cc.tweaked.gradle.CCTweakedPlugin
-import cc.tweaked.gradle.IdeaRunConfigurations
 import cc.tweaked.gradle.MinecraftConfigurations
 
 plugins {

buildSrc/src/main/kotlin/cc-tweaked.java-convention.gradle.kts

@@ -29,7 +29,7 @@ base.archivesName.convention("cc-tweaked-$mcVersion-${project.name}")
 
 java {
     toolchain {
-        languageVersion= CCTweakedPlugin.JAVA_VERSION
+        languageVersion = CCTweakedPlugin.JAVA_VERSION
     }
 
     withSourcesJar()
@@ -93,6 +93,7 @@ sourceSets.all {
             check("InvalidBlockTag", CheckSeverity.OFF) // Broken by @cc.xyz
             check("InlineMeSuggester", CheckSeverity.OFF) // Minecraft uses @Deprecated liberally
             // Too many false positives right now. Maybe we need an indirection for it later on.
+            check("AssignmentExpression", CheckSeverity.OFF) // I'm a bad person.
             check("ReferenceEquality", CheckSeverity.OFF)
             check("EnumOrdinal", CheckSeverity.OFF) // For now. We could replace most of these with EnumMap.
             check("OperatorPrecedence", CheckSeverity.OFF) // For now.
@@ -121,7 +122,6 @@ tasks.compileTestJava {
     }
 }
 
-
 tasks.withType(JavaCompile::class.java).configureEach {
     options.encoding = "UTF-8"
 }
@@ -170,7 +170,7 @@ tasks.test {
 
 tasks.withType(JacocoReport::class.java).configureEach {
     reports.xml.required = true
-    reports.html.required =true
+    reports.html.required = true
 }
 
 project.plugins.withType(CCTweakedPlugin::class.java) {
@@ -194,30 +194,23 @@ spotless {
     fun FormatExtension.defaults() {
         endWithNewline()
         trimTrailingWhitespace()
-        indentWithSpaces(4)
+        leadingTabsToSpaces(4)
     }
 
     java {
         defaults()
+        importOrder("", "javax|java", "\\#")
         removeUnusedImports()
     }
 
-    val ktlintConfig = mapOf(
-        "ktlint_standard_no-wildcard-imports" to "disabled",
-        "ktlint_standard_class-naming" to "disabled",
-        "ktlint_standard_function-naming" to "disabled",
-        "ij_kotlin_allow_trailing_comma" to "true",
-        "ij_kotlin_allow_trailing_comma_on_call_site" to "true",
-    )
-
     kotlinGradle {
         defaults()
-        ktlint().editorConfigOverride(ktlintConfig)
+        ktlint()
     }
 
     kotlin {
         defaults()
-        ktlint().editorConfigOverride(ktlintConfig)
+        ktlint()
     }
 }
 

buildSrc/src/main/kotlin/cc/tweaked/gradle/ExecTasks.kt

@@ -5,10 +5,8 @@
 package cc.tweaked.gradle
 
 import org.gradle.api.file.DirectoryProperty
-import org.gradle.api.provider.Property
 import org.gradle.api.tasks.AbstractExecTask
 import org.gradle.api.tasks.OutputDirectory
-import java.io.File
 
 abstract class ExecToDir : AbstractExecTask<ExecToDir>(ExecToDir::class.java) {
     @get:OutputDirectory

buildSrc/src/main/kotlin/cc/tweaked/gradle/IdeaRunConfigurations.kt

@@ -25,7 +25,6 @@ import javax.xml.xpath.XPathFactory
  * Would be good to PR some (or all) of these changes upstream at some point.
  *
  * @see net.fabricmc.loom.configuration.ide.idea.IdeaSyncTask
- * @see net.minecraftforge.gradle.common.util.runs.IntellijRunGenerator
  */
 internal class IdeaRunConfigurations(project: Project) {
     private val rootProject = project.rootProject
@@ -35,22 +34,6 @@ internal class IdeaRunConfigurations(project: Project) {
     private val writer = TransformerFactory.newInstance().newTransformer()
 
     private val ideaDir = rootProject.file(".idea/")
-    private val buildDir: Lazy<String?> = lazy {
-        val ideaMisc = ideaDir.resolve("misc.xml")
-
-        try {
-            val doc = Files.newBufferedReader(ideaMisc.toPath()).use {
-                documentBuilder.parse(InputSource(it))
-            }
-            val node =
-                xpath.evaluate("//component[@name=\"ProjectRootManager\"]/output", doc, XPathConstants.NODE) as Node
-            val attr = node.attributes.getNamedItem("url") as Attr
-            attr.value.removePrefix("file://")
-        } catch (e: Exception) {
-            LOGGER.error("Failed to find root directory", e)
-            null
-        }
-    }
 
     fun patch() = synchronized(LOCK) {
         val runConfigDir = ideaDir.resolve("runConfigurations")
@@ -58,10 +41,9 @@ internal class IdeaRunConfigurations(project: Project) {
 
         Files.list(runConfigDir.toPath()).use {
             for (configuration in it) {
-                val filename = configuration.fileName.toString();
+                val filename = configuration.fileName.toString()
                 when {
                     filename.endsWith("_fabric.xml") -> patchFabric(configuration)
-                    filename.startsWith("forge_") && filename.endsWith(".xml") -> patchForge(configuration)
                     else -> {}
                 }
             }
@@ -72,65 +54,6 @@ internal class IdeaRunConfigurations(project: Project) {
         setXml("//configuration", "folderName") { "Fabric" }
     }
 
-    private fun patchForge(path: Path) = withXml(path) {
-        val configId = path.fileName.toString().removePrefix("forge_").removeSuffix(".xml")
-        val sourceSet = forgeConfigs[configId]
-        if (sourceSet == null) {
-            LOGGER.error("[{}] Cannot map run configuration to a known source set", path)
-            return@withXml
-        }
-
-        setXml("//configuration", "folderName") { "Forge" }
-        setXml("//configuration/module", "name") { "${rootProject.name}.forge.$sourceSet" }
-
-        if (buildDir.value == null) return@withXml
-        setXml("//configuration/envs/env[@name=\"MOD_CLASSES\"]", "value") { classpath ->
-            val classes = classpath!!.split(':')
-            val newClasses = mutableListOf<String>()
-            fun appendUnique(x: String) {
-                if (!newClasses.contains(x)) newClasses.add(x)
-            }
-
-            for (entry in classes) {
-                if (!entry.contains("/out/")) {
-                    appendUnique(entry)
-                    continue
-                }
-
-                val match = CLASSPATH_ENTRY.matchEntire(entry)
-                if (match != null) {
-                    val modId = match.groups["modId"]!!.value
-                    val proj = match.groups["proj"]!!.value
-                    var component = match.groups["component"]!!.value
-                    if (component == "production") component = "main"
-
-                    appendUnique(forgeModEntry(modId, proj, component))
-                } else {
-                    LOGGER.warn("[{}] Unknown classpath entry {}", path, entry)
-                    appendUnique(entry)
-                }
-            }
-
-            // Ensure common code is on the classpath
-            for (proj in listOf("common", "common-api")) {
-                for (component in listOf("main", "client")) {
-                    appendUnique(forgeModEntry("computercraft", proj, component))
-                }
-            }
-
-            if (newClasses.any { it.startsWith("cctest%%") }) {
-                appendUnique(forgeModEntry("cctest", "core", "testFixtures"))
-                appendUnique(forgeModEntry("cctest", "common", "testFixtures"))
-                appendUnique(forgeModEntry("cctest", "common", "testMod"))
-            }
-
-            newClasses.joinToString(":")
-        }
-    }
-
-    private fun forgeModEntry(mod: String, project: String, component: String) =
-        "$mod%%${buildDir.value}/production/${rootProject.name}.$project.$component"
-
     private fun LocatedDocument.setXml(xpath: String, attribute: String, value: (String?) -> String) {
         val node = this@IdeaRunConfigurations.xpath.evaluate(xpath, document, XPathConstants.NODE) as Node?
         if (node == null) {
@@ -159,16 +82,5 @@ internal class IdeaRunConfigurations(project: Project) {
     companion object {
         private val LOGGER = Logging.getLogger(IdeaRunConfigurations::class.java)
         private val LOCK = Any()
-
-        private val CLASSPATH_ENTRY =
-            Regex("(?<modId>[a-z]+)%%\\\$PROJECT_DIR\\\$/projects/(?<proj>[a-z-]+)/out/(?<component>\\w+)/(?<type>[a-z]+)\$")
-
-        private val forgeConfigs = mapOf(
-            "runClient" to "client",
-            "runData" to "main",
-            "runGameTestServer" to "testMod",
-            "runServer" to "main",
-            "runTestClient" to "testMod",
-        )
     }
 }

buildSrc/src/main/kotlin/cc/tweaked/gradle/XmlUtil.kt

@@ -1,16 +0,0 @@
-// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
-//
-// SPDX-License-Identifier: MPL-2.0
-
-package cc.tweaked.gradle
-
-import groovy.util.Node
-import groovy.util.NodeList
-
-object XmlUtil {
-    fun findChild(node: Node, name: String): Node? = when (val child = node.get(name)) {
-        is Node -> child
-        is NodeList -> child.singleOrNull() as Node?
-        else -> null
-    }
-}

crowdin.yml

@@ -12,6 +12,7 @@ files:
         de: de_de    # German
         es-ES: es_es # Spanish
         fr: fr_fr    # French
+        hu: hu_hu    # Hungarian
         it: it_it    # Italian
         ja: ja_jp    # Japanese
         ko: ko_kr    # Korean

gradle.properties

@@ -12,7 +12,7 @@ neogradle.subsystems.conventions.runs.enabled=false
 
 # Mod properties
 isUnstable=true
-modVersion=1.115.1
+modVersion=1.116.1
 
 # Minecraft properties: We want to configure this here so we can read it in settings.gradle
 mcVersion=1.21.1

gradle/libs.versions.toml

@@ -10,7 +10,7 @@
 fabric-api = "0.102.1+1.21.1"
 fabric-loader = "0.15.11"
 neoForge = "21.1.9"
-neoForgeSpi = "8.0.1"
+neoMergeTool = "2.0.0"
 mixin = "0.8.5"
 parchment = "2024.07.28"
 parchmentMc = "1.21"
@@ -26,7 +26,7 @@ slf4j = "2.0.9"
 asm = "9.6"
 autoService = "1.1.1"
 checkerFramework = "3.42.0"
-cobalt = { strictly = "0.9.5" }
+cobalt = { strictly = "0.9.6" }
 commonsCli = "1.6.0"
 jetbrainsAnnotations = "24.1.0"
 jspecify = "1.0.0"
@@ -58,24 +58,24 @@ junitPlatform = "1.11.4"
 jmh = "1.37"
 
 # Build tools
-cctJavadoc = "1.8.3"
-checkstyle = "10.21.2"
-errorProne-core = "2.36.0"
+cctJavadoc = "1.8.4"
+checkstyle = "10.23.1"
+errorProne-core = "2.38.0"
 errorProne-plugin = "4.1.0"
-fabric-loom = "1.9.2"
+fabric-loom = "1.10.4"
 githubRelease = "2.5.2"
 gradleVersions = "0.50.0"
 ideaExt = "1.1.7"
-illuaminate = "0.1.0-74-gf1551d5"
+illuaminate = "0.1.0-83-g1131f68"
 lwjgl = "3.3.3"
 minotaur = "2.8.7"
-modDevGradle = "2.0.74"
-nullAway = "0.12.3"
+modDevGradle = "2.0.95"
+nullAway = "0.12.7"
 shadow = "8.3.1"
-spotless = "6.23.3"
+spotless = "7.0.2"
 taskTree = "2.1.1"
-teavm = "0.11.0-SQUID.1"
-vanillaExtract = "0.2.0"
+teavm = "0.13.0-SQUID.1"
+vanillaExtract = "0.2.1"
 versionCatalogUpdate = "0.8.1"
 
 [libraries]
@@ -87,7 +87,7 @@ checkerFramework = { module = "org.checkerframework:checker-qual", version.ref =
 cobalt = { module = "cc.tweaked:cobalt", version.ref = "cobalt" }
 commonsCli = { module = "commons-cli:commons-cli", version.ref = "commonsCli" }
 fastutil = { module = "it.unimi.dsi:fastutil", version.ref = "fastutil" }
-neoForgeSpi = { module = "net.neoforged:neoforgespi", version.ref = "neoForgeSpi" }
+neoMergeTool = { module = "net.neoforged:mergetool", version.ref = "neoMergeTool" }
 guava = { module = "com.google.guava:guava", version.ref = "guava" }
 jetbrainsAnnotations = { module = "org.jetbrains:annotations", version.ref = "jetbrainsAnnotations" }
 jspecify = { module = "org.jspecify:jspecify", version.ref = "jspecify" }

package.json

@@ -12,11 +12,11 @@
     "tslib": "^2.0.3"
   },
   "devDependencies": {
-    "@rollup/plugin-node-resolve": "^15.2.1",
+    "@rollup/plugin-node-resolve": "^16.0.0",
     "@rollup/plugin-typescript": "^12.0.0",
     "@rollup/plugin-url": "^8.0.1",
     "@swc/core": "^1.3.92",
-    "@types/node": "^22.0.0",
+    "@types/node": "^24.0.0",
     "lightningcss": "^1.22.0",
     "preact-render-to-string": "^6.2.1",
     "rehype": "^13.0.0",

projects/common-api/src/main/java/dan200/computercraft/api/ComputerCraftTags.java

@@ -28,6 +28,20 @@ public class ComputerCraftTags {
         public static final TagKey<Item> WIRED_MODEM = make("wired_modem");
         public static final TagKey<Item> MONITOR = make("monitor");
 
+        /**
+         * Floppy disks. Both the read/write version, and treasure disks.
+         *
+         * @since 1.116.0
+         */
+        public static final TagKey<Item> DISKS = make("disks");
+
+        /**
+         * All pocket computers.
+         *
+         * @since 1.116.0
+         */
+        public static final TagKey<Item> POCKET_COMPUTERS = make("pocket_computers");
+
         /**
          * Items which can be {@linkplain Item#use(Level, Player, InteractionHand) used} when calling
          * {@code turtle.place()}.

projects/common-api/src/main/java/dan200/computercraft/api/detail/ComponentDetailProvider.java

@@ -51,10 +51,10 @@ public abstract class ComponentDetailProvider<T> implements DetailProvider<DataC
      * This method is always called on the server thread, so it is safe to interact with the world here, but you should
      * take care to avoid long blocking operations as this will stall the server and other computers.
      *
-     * @param data The full details to be returned for this item stack. New properties should be added to this map.
-     * @param item The component to provide details for.
+     * @param data      The full details to be returned for this item stack. New properties should be added to this map.
+     * @param component The component to provide details for.
      */
-    public abstract void provideComponentDetails(Map<? super String, Object> data, T item);
+    public abstract void provideComponentDetails(Map<? super String, Object> data, T component);
 
     @Override
     public final void provideDetails(Map<? super String, Object> data, DataComponentHolder holder) {

projects/common/src/client/java/dan200/computercraft/client/ClientRegistry.java

@@ -25,7 +25,6 @@ import dan200.computercraft.shared.command.CommandComputerCraft;
 import dan200.computercraft.shared.computer.core.ComputerState;
 import dan200.computercraft.shared.computer.core.ServerContext;
 import dan200.computercraft.shared.computer.inventory.AbstractComputerMenu;
-import dan200.computercraft.shared.media.items.DiskItem;
 import dan200.computercraft.shared.turtle.TurtleOverlay;
 import net.minecraft.Util;
 import net.minecraft.client.Minecraft;
@@ -41,7 +40,6 @@ import net.minecraft.client.renderer.item.ClampedItemPropertyFunction;
 import net.minecraft.client.renderer.item.ItemProperties;
 import net.minecraft.network.chat.Component;
 import net.minecraft.resources.ResourceLocation;
-import net.minecraft.server.packs.resources.PreparableReloadListener;
 import net.minecraft.server.packs.resources.ResourceProvider;
 import net.minecraft.util.FastColor;
 import net.minecraft.world.entity.LivingEntity;
@@ -52,6 +50,8 @@ import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.component.DyedItemColor;
 import net.minecraft.world.level.ItemLike;
 import org.jspecify.annotations.Nullable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.IOException;
@@ -69,6 +69,8 @@ import java.util.function.Supplier;
  * @see ModRegistry The common registry for actual game objects.
  */
 public final class ClientRegistry {
+    private static final Logger LOG = LoggerFactory.getLogger(ClientRegistry.class);
+
     private ClientRegistry() {
     }
 
@@ -143,10 +145,6 @@ public final class ClientRegistry {
         void register(Item item, ResourceLocation name, ClampedItemPropertyFunction property);
     }
 
-    public static void registerReloadListeners(Consumer<PreparableReloadListener> register, Minecraft minecraft) {
-        register.accept(GuiSprites.initialise(minecraft.getTextureManager()));
-    }
-
     private static final ResourceLocation[] EXTRA_MODELS = {
         TurtleOverlay.ELF_MODEL,
         TurtleBlockEntityRenderer.COLOUR_TURTLE_MODEL,
@@ -160,7 +158,7 @@ public final class ClientRegistry {
 
     public static void registerItemColours(BiConsumer<ItemColor, ItemLike> register) {
         register.accept(
-            (stack, layer) -> layer == 1 ? DiskItem.getColour(stack) : -1,
+            (stack, layer) -> layer == 1 ? DyedItemColor.getOrDefault(stack, Colour.WHITE.getARGB()) : -1,
             ModRegistry.Items.DISK.get()
         );
 
@@ -192,7 +190,18 @@ public final class ClientRegistry {
     }
 
     public static void registerShaders(ResourceProvider resources, BiConsumer<ShaderInstance, Consumer<ShaderInstance>> load) throws IOException {
-        RenderTypes.registerShaders(resources, load);
+        RenderTypes.registerShaders(resources, (name, create, onLoaded) -> {
+            ShaderInstance shader;
+            try {
+                shader = create.get();
+            } catch (Exception e) {
+                LOG.error("Failed to load {}", name, e);
+                onLoaded.accept(null);
+                return;
+            }
+
+            load.accept(shader, onLoaded);
+        });
     }
 
     private record UnclampedPropertyFunction(

projects/common/src/client/java/dan200/computercraft/client/gui/ComputerScreen.java

@@ -6,9 +6,7 @@ package dan200.computercraft.client.gui;
 
 import dan200.computercraft.client.gui.widgets.ComputerSidebar;
 import dan200.computercraft.client.gui.widgets.TerminalWidget;
-import dan200.computercraft.client.render.ComputerBorderRenderer;
-import dan200.computercraft.client.render.RenderTypes;
-import dan200.computercraft.client.render.SpriteRenderer;
+import dan200.computercraft.core.util.Nullability;
 import dan200.computercraft.shared.computer.inventory.AbstractComputerMenu;
 import net.minecraft.client.gui.GuiGraphics;
 import net.minecraft.network.chat.Component;
@@ -40,14 +38,15 @@ public final class ComputerScreen<T extends AbstractComputerMenu> extends Abstra
     public void renderBg(GuiGraphics graphics, float partialTicks, int mouseX, int mouseY) {
         // Draw a border around the terminal
         var terminal = getTerminal();
-        var spriteRenderer = SpriteRenderer.createForGui(graphics, RenderTypes.GUI_SPRITES);
         var computerTextures = GuiSprites.getComputerTextures(family);
 
-        ComputerBorderRenderer.render(
-            spriteRenderer, computerTextures,
-            terminal.getX(), terminal.getY(), terminal.getWidth(), terminal.getHeight(), false
+        graphics.blitSprite(
+            computerTextures.border(),
+            terminal.getX() - BORDER, terminal.getY() - BORDER, terminal.getWidth() + BORDER * 2, terminal.getHeight() + BORDER * 2
+        );
+        graphics.blitSprite(
+            Nullability.assertNonNull(computerTextures.sidebar()),
+            leftPos, topPos + sidebarYOffset, AbstractComputerMenu.SIDEBAR_WIDTH, ComputerSidebar.HEIGHT
         );
-        ComputerSidebar.renderBackground(spriteRenderer, computerTextures, leftPos, topPos + sidebarYOffset);
-        graphics.flush(); // Flush to ensure background textures are drawn before foreground.
     }
 }

projects/common/src/client/java/dan200/computercraft/client/gui/GuiSprites.java

@@ -7,9 +7,6 @@ package dan200.computercraft.client.gui;
 import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.client.render.ComputerBorderRenderer;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
-import net.minecraft.client.renderer.texture.TextureAtlasSprite;
-import net.minecraft.client.renderer.texture.TextureManager;
-import net.minecraft.client.resources.TextureAtlasHolder;
 import net.minecraft.resources.ResourceLocation;
 import org.jspecify.annotations.Nullable;
 
@@ -19,10 +16,7 @@ import java.util.stream.Stream;
 /**
  * Sprite sheet for all GUI texutres in the mod.
  */
-public final class GuiSprites extends TextureAtlasHolder {
-    public static final ResourceLocation SPRITE_SHEET = ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "gui");
-    public static final ResourceLocation TEXTURE = SPRITE_SHEET.withPath(x -> "textures/atlas/" + x + ".png");
-
+public final class GuiSprites {
     public static final ButtonTextures TURNED_OFF = button("turned_off");
     public static final ButtonTextures TURNED_ON = button("turned_on");
     public static final ButtonTextures TERMINATE = button("terminate");
@@ -32,6 +26,9 @@ public final class GuiSprites extends TextureAtlasHolder {
     public static final ComputerTextures COMPUTER_COMMAND = computer("command", false, true);
     public static final ComputerTextures COMPUTER_COLOUR = computer("colour", true, false);
 
+    private GuiSprites() {
+    }
+
     private static ButtonTextures button(String name) {
         return new ButtonTextures(
             ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "buttons/" + name),
@@ -47,34 +44,6 @@ public final class GuiSprites extends TextureAtlasHolder {
         );
     }
 
-    private static @Nullable GuiSprites instance;
-
-    private GuiSprites(TextureManager textureManager) {
-        super(textureManager, TEXTURE, SPRITE_SHEET);
-    }
-
-    /**
-     * Initialise the singleton {@link GuiSprites} instance.
-     *
-     * @param textureManager The current texture manager.
-     * @return The singleton {@link GuiSprites} instance, to register as resource reload listener.
-     */
-    public static GuiSprites initialise(TextureManager textureManager) {
-        if (instance != null) throw new IllegalStateException("GuiSprites has already been initialised");
-        return instance = new GuiSprites(textureManager);
-    }
-
-    /**
-     * Lookup a texture on the atlas.
-     *
-     * @param texture The texture to find.
-     * @return The sprite on the atlas.
-     */
-    public static TextureAtlasSprite get(ResourceLocation texture) {
-        if (instance == null) throw new IllegalStateException("GuiSprites has not been initialised");
-        return instance.getSprite(texture);
-    }
-
     /**
      * Get the appropriate textures to use for a particular computer family.
      *

projects/common/src/client/java/dan200/computercraft/client/gui/KeyConverter.java

@@ -0,0 +1,40 @@
+// SPDX-FileCopyrightText: 2025 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.client.gui;
+
+import org.lwjgl.glfw.GLFW;
+
+/**
+ * Supports for converting/translating key codes.
+ */
+public class KeyConverter {
+    /**
+     * GLFW's key events refer to the physical key code, rather than the "actual" key code (with keyboard layout
+     * applied).
+     * <p>
+     * This makes sense for WASD-style input, but is a right pain for keyboard shortcuts — this function attempts to
+     * translate those keys back to their "actual" key code. See also
+     * <a href="https://github.com/glfw/glfw/issues/1502"> this discussion on GLFW's GitHub.</a>
+     *
+     * @param key      The current key code.
+     * @param scanCode The current scan code.
+     * @return The translated key code.
+     */
+    public static int physicalToActual(int key, int scanCode) {
+        var name = GLFW.glfwGetKeyName(key, scanCode);
+        if (name == null || name.length() != 1) return key;
+
+        // If we've got a single character as the key name, treat that as the ASCII value of the key,
+        // and map that back to a key code.
+        var character = name.charAt(0);
+
+        // 0-9 and A-Z map directly to their GLFW key (they're the same ASCII code).
+        if ((character >= '0' && character <= '9') || (character >= 'A' && character <= 'Z')) return character;
+        // a-z map to GLFW_KEY_{A,Z}
+        if (character >= 'a' && character <= 'z') return GLFW.GLFW_KEY_A + (character - 'a');
+
+        return key;
+    }
+}

projects/common/src/client/java/dan200/computercraft/client/gui/TurtleScreen.java

@@ -7,8 +7,7 @@ package dan200.computercraft.client.gui;
 import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.client.gui.widgets.ComputerSidebar;
 import dan200.computercraft.client.gui.widgets.TerminalWidget;
-import dan200.computercraft.client.render.RenderTypes;
-import dan200.computercraft.client.render.SpriteRenderer;
+import dan200.computercraft.core.util.Nullability;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.inventory.AbstractComputerMenu;
 import dan200.computercraft.shared.turtle.inventory.TurtleMenu;
@@ -64,8 +63,9 @@ public class TurtleScreen extends AbstractComputerScreen<TurtleMenu> {
         }
 
         // Render sidebar
-        var spriteRenderer = SpriteRenderer.createForGui(graphics, RenderTypes.GUI_SPRITES);
-        ComputerSidebar.renderBackground(spriteRenderer, GuiSprites.getComputerTextures(family), leftPos, topPos + sidebarYOffset);
-        graphics.flush(); // Flush to ensure background textures are drawn before foreground.
+        graphics.blitSprite(
+            Nullability.assertNonNull(GuiSprites.getComputerTextures(family).sidebar()),
+            leftPos, topPos + sidebarYOffset, AbstractComputerMenu.SIDEBAR_WIDTH, ComputerSidebar.HEIGHT
+        );
     }
 }

projects/common/src/client/java/dan200/computercraft/client/gui/widgets/ComputerSidebar.java

@@ -6,9 +6,7 @@ package dan200.computercraft.client.gui.widgets;
 
 import dan200.computercraft.client.gui.GuiSprites;
 import dan200.computercraft.client.gui.widgets.DynamicImageButton.HintedMessage;
-import dan200.computercraft.client.render.SpriteRenderer;
 import dan200.computercraft.shared.computer.core.InputHandler;
-import dan200.computercraft.shared.computer.inventory.AbstractComputerMenu;
 import net.minecraft.client.gui.components.AbstractWidget;
 import net.minecraft.network.chat.Component;
 
@@ -24,12 +22,9 @@ public final class ComputerSidebar {
     private static final int ICON_MARGIN = 2;
 
     private static final int CORNERS_BORDER = 3;
-    private static final int FULL_BORDER = CORNERS_BORDER + ICON_MARGIN;
 
     private static final int BUTTONS = 2;
-    private static final int HEIGHT = (ICON_HEIGHT + ICON_MARGIN * 2) * BUTTONS + CORNERS_BORDER * 2;
-
-    private static final int TEX_HEIGHT = 14;
+    public static final int HEIGHT = (ICON_HEIGHT + ICON_MARGIN * 2) * BUTTONS + CORNERS_BORDER * 2;
 
     private ComputerSidebar() {
     }
@@ -63,14 +58,6 @@ public final class ComputerSidebar {
         ));
     }
 
-    public static void renderBackground(SpriteRenderer renderer, GuiSprites.ComputerTextures textures, int x, int y) {
-        var texture = textures.sidebar();
-        if (texture == null) throw new NullPointerException(textures + " has no sidebar texture");
-        var sprite = GuiSprites.get(texture);
-
-        renderer.blitVerticalSliced(sprite, x, y, AbstractComputerMenu.SIDEBAR_WIDTH, HEIGHT, FULL_BORDER, FULL_BORDER, TEX_HEIGHT);
-    }
-
     private static void toggleComputer(BooleanSupplier isOn, InputHandler input) {
         if (isOn.getAsBoolean()) {
             input.shutdown();

projects/common/src/client/java/dan200/computercraft/client/gui/widgets/TerminalWidget.java

@@ -4,6 +4,7 @@
 
 package dan200.computercraft.client.gui.widgets;
 
+import dan200.computercraft.client.gui.KeyConverter;
 import dan200.computercraft.client.render.RenderTypes;
 import dan200.computercraft.client.render.text.FixedWidthFontRenderer;
 import dan200.computercraft.core.terminal.Terminal;
@@ -83,7 +84,7 @@ public class TerminalWidget extends AbstractWidget {
         }
 
         if ((modifiers & GLFW.GLFW_MOD_CONTROL) != 0) {
-            switch (key) {
+            switch (KeyConverter.physicalToActual(key, scancode)) {
                 case GLFW.GLFW_KEY_T -> {
                     if (terminateTimer < 0) terminateTimer = 0;
                 }
@@ -119,7 +120,7 @@ public class TerminalWidget extends AbstractWidget {
             computer.keyUp(key);
         }
 
-        switch (key) {
+        switch (KeyConverter.physicalToActual(key, scancode)) {
             case GLFW.GLFW_KEY_T -> terminateTimer = -1;
             case GLFW.GLFW_KEY_R -> rebootTimer = -1;
             case GLFW.GLFW_KEY_S -> shutdownTimer = -1;

projects/common/src/client/java/dan200/computercraft/client/integration/jei/JEIComputerCraft.java

@@ -8,7 +8,6 @@ import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.shared.ModRegistry;
 import dan200.computercraft.shared.integration.RecipeModHelpers;
-import dan200.computercraft.shared.media.items.DiskItem;
 import dan200.computercraft.shared.pocket.items.PocketComputerItem;
 import dan200.computercraft.shared.turtle.items.TurtleItem;
 import mezz.jei.api.IModPlugin;
@@ -23,6 +22,7 @@ import net.minecraft.client.Minecraft;
 import net.minecraft.core.RegistryAccess;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.component.DyedItemColor;
 
 import java.util.List;
 
@@ -100,7 +100,7 @@ public class JEIComputerCraft implements IModPlugin {
     /**
      * Distinguishes disks by colour.
      */
-    private static final IIngredientSubtypeInterpreter<ItemStack> diskSubtype = (stack, ctx) -> Integer.toString(DiskItem.getColour(stack));
+    private static final IIngredientSubtypeInterpreter<ItemStack> diskSubtype = (stack, ctx) -> Integer.toString(DyedItemColor.getOrDefault(stack, -1));
 
     private static RegistryAccess getRegistryAccess() {
         return Minecraft.getInstance().level.registryAccess();

projects/common/src/client/java/dan200/computercraft/client/render/ComputerBorderRenderer.java

@@ -1,17 +1,14 @@
-// Copyright Daniel Ratcliffe, 2011-2022. Do not distribute without permission.
+// SPDX-FileCopyrightText: 2025 The CC: Tweaked Developers
 //
-// SPDX-License-Identifier: LicenseRef-CCPL
+// SPDX-License-Identifier: MPL-2.0
 
 package dan200.computercraft.client.render;
 
-import dan200.computercraft.client.gui.GuiSprites;
-import net.minecraft.client.renderer.texture.TextureAtlasSprite;
-
-import static dan200.computercraft.client.render.SpriteRenderer.u;
-import static dan200.computercraft.client.render.SpriteRenderer.v;
+import dan200.computercraft.client.gui.ComputerScreen;
+import net.minecraft.client.resources.metadata.gui.GuiSpriteScaling;
 
 /**
- * Renders the borders of computers, either for a GUI ({@link dan200.computercraft.client.gui.ComputerScreen}) or
+ * Constants for the borders of computers, either for a {@linkplain ComputerScreen GUI} or
  * {@linkplain PocketItemRenderer in-hand pocket computers}.
  */
 public final class ComputerBorderRenderer {
@@ -21,55 +18,13 @@ public final class ComputerBorderRenderer {
     public static final int MARGIN = 2;
 
     /**
-     * The width of the terminal border.
+     * The size of the terminal border.
+     * <p>
+     * This is only used for layout of elements within UI. When rendering, the size of the computer's border is
+     * determined by its {@link GuiSpriteScaling}.
      */
     public static final int BORDER = 12;
 
-    public static final int LIGHT_HEIGHT = 8;
-
-    private static final int TEX_SIZE = 36;
-
     private ComputerBorderRenderer() {
     }
-
-    public static void render(SpriteRenderer renderer, GuiSprites.ComputerTextures textures, int x, int y, int width, int height, boolean withLight) {
-        var endX = x + width;
-        var endY = y + height;
-
-        var border = GuiSprites.get(textures.border());
-
-        // Top bar
-        blitBorder(renderer, border, x - BORDER, y - BORDER, 0, 0, BORDER, BORDER);
-        blitBorder(renderer, border, x, y - BORDER, BORDER, 0, width, BORDER);
-        blitBorder(renderer, border, endX, y - BORDER, BORDER * 2, 0, BORDER, BORDER);
-
-        // Vertical bars
-        blitBorder(renderer, border, x - BORDER, y, 0, BORDER, BORDER, height);
-        blitBorder(renderer, border, endX, y, BORDER * 2, BORDER, BORDER, height);
-
-        // Bottom bar. We allow for drawing a stretched version, which allows for additional elements (such as the
-        // pocket computer's lights).
-        if (withLight) {
-            var pocketBottomTexture = textures.pocketBottom();
-            if (pocketBottomTexture == null) throw new NullPointerException(textures + " has no pocket texture");
-            var pocketBottom = GuiSprites.get(pocketBottomTexture);
-
-            renderer.blitHorizontalSliced(
-                pocketBottom, x - BORDER, endY, width + BORDER * 2, BORDER + LIGHT_HEIGHT,
-                BORDER, BORDER, BORDER * 3
-            );
-        } else {
-            blitBorder(renderer, border, x - BORDER, endY, 0, BORDER * 2, BORDER, BORDER);
-            blitBorder(renderer, border, x, endY, BORDER, BORDER * 2, width, BORDER);
-            blitBorder(renderer, border, endX, endY, BORDER * 2, BORDER * 2, BORDER, BORDER);
-        }
-    }
-
-    private static void blitBorder(SpriteRenderer renderer, TextureAtlasSprite sprite, int x, int y, int u, int v, int width, int height) {
-        renderer.blit(
-            x, y, width, height,
-            u(sprite, u, TEX_SIZE), v(sprite, v, TEX_SIZE),
-            u(sprite, u + BORDER, TEX_SIZE), v(sprite, v + BORDER, TEX_SIZE)
-        );
-    }
 }

projects/common/src/client/java/dan200/computercraft/client/render/CustomLecternRenderer.java

@@ -12,6 +12,7 @@ import dan200.computercraft.client.pocket.ClientPocketComputers;
 import dan200.computercraft.client.render.text.FixedWidthFontRenderer;
 import dan200.computercraft.core.terminal.Terminal;
 import dan200.computercraft.core.util.Colour;
+import dan200.computercraft.shared.ModRegistry;
 import dan200.computercraft.shared.lectern.CustomLecternBlockEntity;
 import dan200.computercraft.shared.media.items.PrintoutData;
 import dan200.computercraft.shared.media.items.PrintoutItem;
@@ -59,9 +60,9 @@ public class CustomLecternRenderer implements BlockEntityRenderer<CustomLecternB
         poseStack.translate(0, -0.125f, 0);
 
         var item = lectern.getItem();
-        if (item.getItem() instanceof PrintoutItem printout) {
+        if (item.getItem() instanceof PrintoutItem) {
             var vertexConsumer = LecternPrintoutModel.MATERIAL.buffer(buffer, RenderType::entitySolid);
-            if (printout.getType() == PrintoutItem.Type.BOOK) {
+            if (item.is(ModRegistry.Items.PRINTED_BOOK.get())) {
                 printoutModel.renderBook(poseStack, vertexConsumer, packedLight, packedOverlay);
             } else {
                 printoutModel.renderPages(poseStack, vertexConsumer, packedLight, packedOverlay, PrintoutData.getOrEmpty(item).pages());

projects/common/src/client/java/dan200/computercraft/client/render/PocketItemRenderer.java

@@ -13,13 +13,16 @@ import dan200.computercraft.core.util.Colour;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.config.Config;
 import dan200.computercraft.shared.pocket.items.PocketComputerItem;
+import net.minecraft.client.Minecraft;
 import net.minecraft.client.renderer.MultiBufferSource;
+import net.minecraft.client.resources.metadata.gui.GuiSpriteScaling;
 import net.minecraft.util.FastColor;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.component.DyedItemColor;
 import org.joml.Matrix4f;
 
-import static dan200.computercraft.client.render.ComputerBorderRenderer.*;
+import static dan200.computercraft.client.render.ComputerBorderRenderer.BORDER;
+import static dan200.computercraft.client.render.ComputerBorderRenderer.MARGIN;
 import static dan200.computercraft.client.render.text.FixedWidthFontRenderer.FONT_HEIGHT;
 import static dan200.computercraft.client.render.text.FixedWidthFontRenderer.FONT_WIDTH;
 
@@ -29,6 +32,11 @@ import static dan200.computercraft.client.render.text.FixedWidthFontRenderer.FON
 public final class PocketItemRenderer extends ItemMapLikeRenderer {
     public static final PocketItemRenderer INSTANCE = new PocketItemRenderer();
 
+    /**
+     * The height of the pocket computer's light.
+     */
+    private static final int LIGHT_HEIGHT = 8;
+
     private PocketItemRenderer() {
     }
 
@@ -83,14 +91,69 @@ public final class PocketItemRenderer extends ItemMapLikeRenderer {
     }
 
     private static void renderFrame(Matrix4f transform, MultiBufferSource render, ComputerFamily family, int colour, int light, int width, int height) {
-        var texture = colour != -1 ? GuiSprites.COMPUTER_COLOUR : GuiSprites.getComputerTextures(family);
+        var textures = colour != -1 ? GuiSprites.COMPUTER_COLOUR : GuiSprites.getComputerTextures(family);
+        var spriteRenderer = new SpriteRenderer(transform, render, 0, light, colour);
+        renderBorder(spriteRenderer, textures, width, height);
+    }
 
-        var r = (colour >>> 16) & 0xFF;
-        var g = (colour >>> 8) & 0xFF;
-        var b = colour & 0xFF;
+    private static void renderBorder(SpriteRenderer renderer, GuiSprites.ComputerTextures textures, int width, int height) {
+        var sprites = Minecraft.getInstance().getGuiSprites();
 
-        var spriteRenderer = new SpriteRenderer(transform, render.getBuffer(RenderTypes.GUI_SPRITES), 0, light, r, g, b);
-        ComputerBorderRenderer.render(spriteRenderer, texture, 0, 0, width, height, true);
+        // Find our border, forcing it to be a nine-sliced texture.
+        var borderSprite = sprites.getSprite(textures.border());
+        var borderSlice = getSlice(sprites.getSpriteScaling(borderSprite), DEFAULT_BORDER);
+        var borderBounds = borderSlice.border();
+
+        // And take the separate bottom bit of the pocket computer.
+        var bottomTexture = textures.pocketBottom();
+        if (bottomTexture == null) throw new NullPointerException(textures + " has no pocket texture");
+        var bottomSprite = sprites.getSprite(bottomTexture);
+        var bottomSlice = getSlice(sprites.getSpriteScaling(bottomSprite), DEFAULT_BOTTOM);
+        var bottomBounds = bottomSlice.border();
+
+        // Now draw a nine-sliced texture, by stitching together the top parts of the border with the pocket bottom.
+
+        // Top bar
+        renderer.blit(
+            borderSprite, -borderBounds.left(), -borderBounds.top(), borderBounds.left(), borderBounds.top(),
+            0, 0, borderSlice.width(), borderSlice.height()
+        );
+        renderer.blitTiled(
+            borderSprite, 0, -borderBounds.top(), width, borderBounds.top(),
+            borderBounds.left(), 0, borderSlice.width() - borderBounds.left() - borderBounds.right(), borderBounds.top(),
+            borderSlice.width(), borderSlice.height()
+        );
+        renderer.blit(
+            borderSprite, width, -borderBounds.top(), borderBounds.right(), borderBounds.top(),
+            borderSlice.width() - borderBounds.right(), 0, borderSlice.width(), borderSlice.height()
+        );
+
+        // Vertical bars
+        renderer.blitTiled(
+            borderSprite, -borderBounds.left(), 0, borderBounds.left(), height,
+            0, borderBounds.top(), borderBounds.left(), borderSlice.height() - borderBounds.top() - borderBounds.bottom(),
+            borderSlice.width(), borderSlice.height()
+        );
+        renderer.blitTiled(
+            borderSprite, width, 0, borderBounds.right(), height,
+            borderSlice.width() - borderBounds.right(), borderBounds.top(), borderBounds.right(), borderSlice.height() - borderBounds.top() - borderBounds.bottom(),
+            borderSlice.width(), borderSlice.height()
+        );
+
+        // Bottom
+        renderer.blit(
+            bottomSprite, -bottomBounds.left(), height, bottomBounds.left(), bottomSlice.height(),
+            0, 0, bottomSlice.width(), bottomSlice.height()
+        );
+        renderer.blitTiled(
+            bottomSprite, 0, height, width, bottomSlice.height(),
+            bottomBounds.left(), 0, bottomSlice.width() - bottomBounds.left() - bottomBounds.right(), bottomSlice.height(),
+            bottomSlice.width(), bottomSlice.height()
+        );
+        renderer.blit(
+            bottomSprite, width, height, bottomBounds.right(), bottomSlice.height(),
+            bottomSlice.width() - bottomBounds.right(), 0, bottomSlice.width(), bottomSlice.height()
+        );
     }
 
     private static void renderLight(PoseStack transform, MultiBufferSource render, int colour, int width, int height) {
@@ -101,4 +164,16 @@ public final class PocketItemRenderer extends ItemMapLikeRenderer {
             FastColor.ARGB32.opaque(colour), RenderTypes.FULL_BRIGHT_LIGHTMAP
         );
     }
+
+    private static final GuiSpriteScaling.NineSlice DEFAULT_BORDER = new GuiSpriteScaling.NineSlice(
+        36, 36, new GuiSpriteScaling.NineSlice.Border(12, 12, 12, 12)
+    );
+
+    private static final GuiSpriteScaling.NineSlice DEFAULT_BOTTOM = new GuiSpriteScaling.NineSlice(
+        36, 20, new GuiSpriteScaling.NineSlice.Border(12, 0, 12, 0)
+    );
+
+    private static GuiSpriteScaling.NineSlice getSlice(GuiSpriteScaling scaling, GuiSpriteScaling.NineSlice fallback) {
+        return scaling instanceof GuiSpriteScaling.NineSlice slice ? slice : fallback;
+    }
 }

projects/common/src/client/java/dan200/computercraft/client/render/PrintoutItemRenderer.java

@@ -8,7 +8,6 @@ import com.mojang.blaze3d.vertex.PoseStack;
 import com.mojang.math.Axis;
 import dan200.computercraft.shared.ModRegistry;
 import dan200.computercraft.shared.media.items.PrintoutData;
-import dan200.computercraft.shared.media.items.PrintoutItem;
 import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.world.entity.EntityType;
 import net.minecraft.world.entity.decoration.ItemFrame;
@@ -53,7 +52,7 @@ public final class PrintoutItemRenderer extends ItemMapLikeRenderer {
         var pageData = stack.getOrDefault(ModRegistry.DataComponents.PRINTOUT.get(), PrintoutData.EMPTY);
 
         var pages = pageData.pages();
-        var book = ((PrintoutItem) stack.getItem()).getType() == PrintoutItem.Type.BOOK;
+        var book = stack.is(ModRegistry.Items.PRINTED_BOOK.get());
 
         double width = LINE_LENGTH * FONT_WIDTH + X_TEXT_MARGIN * 2;
         double height = LINES_PER_PAGE * FONT_HEIGHT + Y_TEXT_MARGIN * 2;

projects/common/src/client/java/dan200/computercraft/client/render/RenderTypes.java

@@ -7,7 +7,6 @@ package dan200.computercraft.client.render;
 import com.mojang.blaze3d.vertex.DefaultVertexFormat;
 import com.mojang.blaze3d.vertex.VertexFormat;
 import dan200.computercraft.api.ComputerCraftAPI;
-import dan200.computercraft.client.gui.GuiSprites;
 import dan200.computercraft.client.render.monitor.MonitorTextureBufferShader;
 import dan200.computercraft.client.render.text.FixedWidthFontRenderer;
 import net.minecraft.client.renderer.GameRenderer;
@@ -16,11 +15,11 @@ import net.minecraft.client.renderer.RenderType;
 import net.minecraft.client.renderer.ShaderInstance;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.server.packs.resources.ResourceProvider;
+import org.apache.commons.io.function.IOSupplier;
 import org.jspecify.annotations.Nullable;
 
 import java.io.IOException;
 import java.util.Objects;
-import java.util.function.BiConsumer;
 import java.util.function.Consumer;
 
 /**
@@ -54,11 +53,6 @@ public class RenderTypes {
      */
     public static final RenderType PRINTOUT_BACKGROUND = RenderType.text(ResourceLocation.fromNamespaceAndPath("computercraft", "textures/gui/printout.png"));
 
-    /**
-     * Render type for {@linkplain GuiSprites GUI sprites}.
-     */
-    public static final RenderType GUI_SPRITES = RenderType.text(GuiSprites.TEXTURE);
-
     public static MonitorTextureBufferShader getMonitorTextureBufferShader() {
         if (monitorTboShader == null) throw new NullPointerException("MonitorTboShader has not been registered");
         return monitorTboShader;
@@ -68,9 +62,12 @@ public class RenderTypes {
         return Objects.requireNonNull(GameRenderer.getRendertypeTextShader(), "Text shader has not been registered");
     }
 
-    public static void registerShaders(ResourceProvider resources, BiConsumer<ShaderInstance, Consumer<ShaderInstance>> load) throws IOException {
-        load.accept(
-            new MonitorTextureBufferShader(
+    public interface ShaderLoader {
+        void tryLoad(String name, IOSupplier<ShaderInstance> create, Consumer<@Nullable ShaderInstance> accept) throws IOException;
+    }
+
+    public static void registerShaders(ResourceProvider resources, ShaderLoader load) throws IOException {
+        load.tryLoad("monitor shader", () -> new MonitorTextureBufferShader(
                 resources,
                 ComputerCraftAPI.MOD_ID + "/monitor_tbo",
                 MONITOR_TBO.format()

projects/common/src/client/java/dan200/computercraft/client/render/SpriteRenderer.java

@@ -6,129 +6,69 @@ package dan200.computercraft.client.render;
 
 import com.mojang.blaze3d.vertex.VertexConsumer;
 import net.minecraft.client.gui.GuiGraphics;
+import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.client.renderer.RenderType;
 import net.minecraft.client.renderer.texture.TextureAtlasSprite;
+import net.minecraft.resources.ResourceLocation;
 import org.joml.Matrix4f;
 
 /**
- * A {@link GuiGraphics}-equivalent which is suitable for both rendering in to a GUI and in-world (as part of an entity
- * renderer).
+ * A {@link GuiGraphics}-equivalent renders to a {@link VertexConsumer}. This is suitable for rendering outside of a
+ * GUI, such as part of an entity renderer.
  * <p>
  * This batches all render calls together, though requires that all {@link TextureAtlasSprite}s are on the same sprite
  * sheet.
  */
 public class SpriteRenderer {
+    public static final ResourceLocation TEXTURE = ResourceLocation.withDefaultNamespace("textures/atlas/gui.png");
+
     private final Matrix4f transform;
-    private final VertexConsumer builder;
+    private final MultiBufferSource buffers;
     private final int light;
     private final int z;
-    private final int r, g, b;
+    private final int colour;
 
-    public SpriteRenderer(Matrix4f transform, VertexConsumer builder, int z, int light, int r, int g, int b) {
+    public SpriteRenderer(Matrix4f transform, MultiBufferSource buffers, int z, int light, int colour) {
         this.transform = transform;
-        this.builder = builder;
+        this.buffers = buffers;
         this.z = z;
         this.light = light;
-        this.r = r;
-        this.g = g;
-        this.b = b;
+        this.colour = colour;
     }
 
-    public static SpriteRenderer createForGui(GuiGraphics graphics, RenderType renderType) {
-        return new SpriteRenderer(
-            graphics.pose().last().pose(), graphics.bufferSource().getBuffer(renderType),
-            0, RenderTypes.FULL_BRIGHT_LIGHTMAP, 255, 255, 255
-        );
+    public void blit(TextureAtlasSprite sprite, int x0, int y0, int width, int height, int spriteX, int spriteY, int spriteWidth, int spriteHeight) {
+        if (width == 0 || height == 0) return;
+
+        var x1 = x0 + width;
+        var y1 = y0 + height;
+        var u0 = sprite.getU((float) spriteX / spriteWidth);
+        var u1 = sprite.getU((float) (spriteX + width) / spriteWidth);
+        var v0 = sprite.getV((float) spriteY / spriteHeight);
+        var v1 = sprite.getV((float) (spriteY + height) / spriteHeight);
+
+        var vertices = buffers.getBuffer(RenderType.text(sprite.atlasLocation()));
+        vertices.addVertex(transform, x0, y1, z).setColor(colour).setUv(u0, v1).setLight(light);
+        vertices.addVertex(transform, x1, y1, z).setColor(colour).setUv(u1, v1).setLight(light);
+        vertices.addVertex(transform, x1, y0, z).setColor(colour).setUv(u1, v0).setLight(light);
+        vertices.addVertex(transform, x0, y0, z).setColor(colour).setUv(u0, v0).setLight(light);
     }
 
-    /**
-     * Render a single sprite.
-     *
-     * @param sprite The texture to draw.
-     * @param x      The x position of the rectangle we'll draw.
-     * @param y      The x position of the rectangle we'll draw.
-     * @param width  The width of the rectangle we'll draw.
-     * @param height The height of the rectangle we'll draw.
-     */
-    public void blit(TextureAtlasSprite sprite, int x, int y, int width, int height) {
-        blit(x, y, width, height, sprite.getU0(), sprite.getV0(), sprite.getU1(), sprite.getV1());
-    }
+    public void blitTiled(
+        TextureAtlasSprite sprite,
+        int x, int y, int width, int height,
+        int tileX, int tileY, int tileWidth, int tileHeight, int spriteWidth, int spriteHeight
+    ) {
+        if (width <= 0 || height <= 0) return;
+        if (tileWidth <= 0 || tileHeight <= 0) {
+            throw new IllegalArgumentException("Tiled sprite texture size must be positive, got " + tileWidth + "x" + tileHeight);
+        }
 
-    /**
-     * Render a horizontal 3-sliced texture (i.e. split into left, middle and right). Unlike {@link GuiGraphics#blitNineSliced},
-     * the middle texture is stretched rather than repeated.
-     *
-     * @param sprite       The texture to draw.
-     * @param x            The x position of the rectangle we'll draw.
-     * @param y            The x position of the rectangle we'll draw.
-     * @param width        The width of the rectangle we'll draw.
-     * @param height       The height of the rectangle we'll draw.
-     * @param leftBorder   The width of the left border.
-     * @param rightBorder  The width of the right border.
-     * @param textureWidth The width of the whole texture.
-     */
-    public void blitHorizontalSliced(TextureAtlasSprite sprite, int x, int y, int width, int height, int leftBorder, int rightBorder, int textureWidth) {
-        // TODO(1.20.2)/TODO(1.21.0): Drive this from mcmeta files, like vanilla does.
-        if (width < leftBorder + rightBorder) throw new IllegalArgumentException("width is less than two borders");
-
-        var centerStart = SpriteRenderer.u(sprite, leftBorder, textureWidth);
-        var centerEnd = SpriteRenderer.u(sprite, textureWidth - rightBorder, textureWidth);
-
-        blit(x, y, leftBorder, height, sprite.getU0(), sprite.getV0(), centerStart, sprite.getV1());
-        blit(x + leftBorder, y, width - leftBorder - rightBorder, height, centerStart, sprite.getV0(), centerEnd, sprite.getV1());
-        blit(x + width - rightBorder, y, rightBorder, height, centerEnd, sprite.getV0(), sprite.getU1(), sprite.getV1());
-    }
-
-    /**
-     * Render a vertical 3-sliced texture (i.e. split into top, middle and bottom). Unlike {@link GuiGraphics#blitNineSliced},
-     * the middle texture is stretched rather than repeated.
-     *
-     * @param sprite        The texture to draw.
-     * @param x             The x position of the rectangle we'll draw.
-     * @param y             The x position of the rectangle we'll draw.
-     * @param width         The width of the rectangle we'll draw.
-     * @param height        The height of the rectangle we'll draw.
-     * @param topBorder     The height of the top border.
-     * @param bottomBorder  The height of the bottom border.
-     * @param textureHeight The height of the whole texture.
-     */
-    public void blitVerticalSliced(TextureAtlasSprite sprite, int x, int y, int width, int height, int topBorder, int bottomBorder, int textureHeight) {
-        // TODO(1.20.2)/TODO(1.21.0): Drive this from mcmeta files, like vanilla does.
-        if (width < topBorder + bottomBorder) throw new IllegalArgumentException("height is less than two borders");
-
-        var centerStart = SpriteRenderer.v(sprite, topBorder, textureHeight);
-        var centerEnd = SpriteRenderer.v(sprite, textureHeight - bottomBorder, textureHeight);
-
-        blit(x, y, width, topBorder, sprite.getU0(), sprite.getV0(), sprite.getU1(), centerStart);
-        blit(x, y + topBorder, width, height - topBorder - bottomBorder, sprite.getU0(), centerStart, sprite.getU1(), centerEnd);
-        blit(x, y + height - bottomBorder, width, bottomBorder, sprite.getU0(), centerEnd, sprite.getU1(), sprite.getV1());
-    }
-
-    /**
-     * The low-level blit function, used to render a portion of the sprite sheet. Unlike other functions, this takes uvs rather than a single sprite.
-     *
-     * @param x      The x position of the rectangle we'll draw.
-     * @param y      The x position of the rectangle we'll draw.
-     * @param width  The width of the rectangle we'll draw.
-     * @param height The height of the rectangle we'll draw.
-     * @param u0     The first U coordinate.
-     * @param v0     The first V coordinate.
-     * @param u1     The second U coordinate.
-     * @param v1     The second V coordinate.
-     */
-    public void blit(
-        int x, int y, int width, int height, float u0, float v0, float u1, float v1) {
-        builder.addVertex(transform, x, y + height, z).setColor(r, g, b, 255).setUv(u0, v1).setLight(light);
-        builder.addVertex(transform, x + width, y + height, z).setColor(r, g, b, 255).setUv(u1, v1).setLight(light);
-        builder.addVertex(transform, x + width, y, z).setColor(r, g, b, 255).setUv(u1, v0).setLight(light);
-        builder.addVertex(transform, x, y, z).setColor(r, g, b, 255).setUv(u0, v0).setLight(light);
-    }
-
-    public static float u(TextureAtlasSprite sprite, int x, int width) {
-        return sprite.getU((float) x / width);
-    }
-
-    public static float v(TextureAtlasSprite sprite, int y, int height) {
-        return sprite.getV((float) y / height);
+        for (var xOffset = 0; xOffset < width; xOffset += tileWidth) {
+            var sliceWidth = Math.min(tileWidth, width - xOffset);
+            for (var yOffset = 0; yOffset < height; yOffset += tileHeight) {
+                var sliceHeight = Math.min(tileHeight, height - yOffset);
+                blit(sprite, x + xOffset, y + yOffset, sliceWidth, sliceHeight, tileX, tileY, spriteWidth, spriteHeight);
+            }
+        }
     }
 }

projects/common/src/client/java/dan200/computercraft/client/render/TurtleBlockEntityRenderer.java

@@ -62,8 +62,8 @@ public class TurtleBlockEntityRenderer implements BlockEntityRenderer<TurtleBloc
             var matrix = transform.last().pose();
             var opacity = (int) (mc.options.getBackgroundOpacity(0.25f) * 255) << 24;
             var width = -font.width(label) / 2.0f;
-            font.drawInBatch(label, width, (float) 0, 0x20ffffff, false, matrix, buffers, Font.DisplayMode.SEE_THROUGH, opacity, lightmapCoord);
-            font.drawInBatch(label, width, (float) 0, CommonColors.WHITE, false, matrix, buffers, Font.DisplayMode.NORMAL, 0, lightmapCoord);
+            font.drawInBatch(label, width, 0, 0x20ffffff, false, matrix, buffers, Font.DisplayMode.SEE_THROUGH, opacity, lightmapCoord);
+            font.drawInBatch(label, width, 0, CommonColors.WHITE, false, matrix, buffers, Font.DisplayMode.NORMAL, 0, lightmapCoord);
 
             transform.popPose();
         }

projects/common/src/datagen/java/dan200/computercraft/data/DataProviders.java

@@ -76,7 +76,7 @@ public final class DataProviders {
                 LecternPocketModel.TEXTURE_NORMAL, LecternPocketModel.TEXTURE_ADVANCED,
                 LecternPocketModel.TEXTURE_COLOUR, LecternPocketModel.TEXTURE_FRAME, LecternPocketModel.TEXTURE_LIGHT
             )));
-            out.accept(GuiSprites.SPRITE_SHEET, makeSprites(
+            out.accept(ResourceLocation.withDefaultNamespace("gui"), makeSprites(
                 // Computers
                 GuiSprites.COMPUTER_NORMAL.textures(),
                 GuiSprites.COMPUTER_ADVANCED.textures(),
@@ -85,6 +85,8 @@ public final class DataProviders {
             ));
         });
 
+        generator.add(ResourceMetadataProvider::new);
+
         generator.add(pack -> new ExtraModelsProvider(pack, fullRegistries) {
             @Override
             public Stream<ResourceLocation> getModels(HolderLookup.Provider registries) {

projects/common/src/datagen/java/dan200/computercraft/data/LanguageProvider.java

@@ -108,6 +108,8 @@ public final class LanguageProvider implements DataProvider {
         add(ComputerCraftTags.Items.TURTLE, "Turtles");
         add(ComputerCraftTags.Items.WIRED_MODEM, "Wired modems");
         add(ComputerCraftTags.Items.MONITOR, "Monitors");
+        add(ComputerCraftTags.Items.DISKS, "Disks");
+        add(ComputerCraftTags.Items.POCKET_COMPUTERS, "Pocket Computers");
         add(ComputerCraftTags.Items.DYEABLE, "Dyable items");
         add(ComputerCraftTags.Items.TURTLE_CAN_PLACE, "Turtle-placeable items");
 
@@ -187,7 +189,6 @@ public final class LanguageProvider implements DataProvider {
         // Metrics
         add(Metrics.COMPUTER_TASKS, "Tasks");
         add(Metrics.SERVER_TASKS, "Server tasks");
-        add(Metrics.JAVA_ALLOCATION, "Java Allocations");
         add(Metrics.PERIPHERAL_OPS, "Peripheral calls");
         add(Metrics.FS_OPS, "Filesystem operations");
         add(Metrics.HTTP_REQUESTS, "HTTP requests");

projects/common/src/datagen/java/dan200/computercraft/data/ResourceMetadataProvider.java

@@ -0,0 +1,110 @@
+// SPDX-FileCopyrightText: 2025 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.data;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import dan200.computercraft.client.gui.GuiSprites;
+import net.minecraft.client.resources.metadata.gui.GuiMetadataSection;
+import net.minecraft.client.resources.metadata.gui.GuiSpriteScaling;
+import net.minecraft.data.CachedOutput;
+import net.minecraft.data.DataProvider;
+import net.minecraft.data.PackOutput;
+import net.minecraft.data.metadata.PackMetadataGenerator;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.packs.metadata.MetadataSectionType;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.Supplier;
+
+/**
+ * Similar to {@link PackMetadataGenerator}, but for individual resources.
+ */
+final class ResourceMetadataProvider implements DataProvider {
+    private final PackOutput output;
+
+    ResourceMetadataProvider(PackOutput output) {
+        this.output = output;
+    }
+
+    private void register(Builder builder) {
+        for (var computerTextures : List.of(
+            GuiSprites.COMPUTER_ADVANCED,
+            GuiSprites.COMPUTER_COLOUR,
+            GuiSprites.COMPUTER_COMMAND,
+            GuiSprites.COMPUTER_NORMAL
+        )) {
+            builder.texture(computerTextures.border()).add(GuiMetadataSection.TYPE, new GuiMetadataSection(
+                new GuiSpriteScaling.NineSlice(36, 36, simpleNineSlicedBorder(12))
+            ));
+
+            var sidebar = computerTextures.sidebar();
+            if (sidebar != null) {
+                builder.texture(sidebar).add(GuiMetadataSection.TYPE, new GuiMetadataSection(
+                    new GuiSpriteScaling.NineSlice(17, 14, new GuiSpriteScaling.NineSlice.Border(3, 4, 0, 3))
+                ));
+            }
+
+            var pocketBottom = computerTextures.pocketBottom();
+            if (pocketBottom != null) {
+                builder.texture(pocketBottom).add(GuiMetadataSection.TYPE, new GuiMetadataSection(
+                    new GuiSpriteScaling.NineSlice(36, 20, new GuiSpriteScaling.NineSlice.Border(12, 0, 12, 0))
+                ));
+            }
+        }
+    }
+
+    private static GuiSpriteScaling.NineSlice.Border simpleNineSlicedBorder(int size) {
+        return new GuiSpriteScaling.NineSlice.Border(size, size, size, size);
+    }
+
+    @Override
+    public CompletableFuture<?> run(CachedOutput cachedOutput) {
+        var builder = new Builder();
+        register(builder);
+
+        var outputPath = output.getOutputFolder(PackOutput.Target.RESOURCE_PACK);
+        return CompletableFuture.allOf(builder.metadata.entrySet().stream().map(entry -> {
+            var json = new JsonObject();
+            entry.getValue().elements.forEach((name, element) -> json.add(name, element.get()));
+            return DataProvider.saveStable(cachedOutput, json, outputPath.resolve(entry.getKey().getNamespace()).resolve(entry.getKey().getPath() + ".mcmeta"));
+        }).toArray(CompletableFuture[]::new));
+    }
+
+    @Override
+    public String getName() {
+        return "Resource Metadata";
+    }
+
+    /**
+     * A builder for a set of {@code mcmeta} files.
+     */
+    private static final class Builder {
+        private final Map<ResourceLocation, FileMetadata> metadata = new HashMap<>();
+
+        FileMetadata texture(ResourceLocation texture) {
+            return file(texture.withPrefix("textures/").withSuffix(".png"));
+        }
+
+        FileMetadata file(ResourceLocation path) {
+            return metadata.computeIfAbsent(path, p -> new FileMetadata());
+        }
+    }
+
+    /**
+     * A builder for a given file's {@code mcmeta} file.
+     */
+    private static final class FileMetadata {
+        private final Map<String, Supplier<JsonElement>> elements = new HashMap<>();
+
+        <T> FileMetadata add(MetadataSectionType<T> type, T value) {
+            elements.put(type.getMetadataSectionName(), () -> type.toJson(value));
+            return this;
+        }
+    }
+}

projects/common/src/datagen/java/dan200/computercraft/data/TagProvider.java

@@ -96,6 +96,8 @@ class TagProvider {
         tags.copy(ComputerCraftTags.Blocks.TURTLE, ComputerCraftTags.Items.TURTLE);
         tags.tag(ComputerCraftTags.Items.WIRED_MODEM).add(ModRegistry.Items.WIRED_MODEM.get(), ModRegistry.Items.WIRED_MODEM_FULL.get());
         tags.copy(ComputerCraftTags.Blocks.MONITOR, ComputerCraftTags.Items.MONITOR);
+        tags.tag(ComputerCraftTags.Items.DISKS).add(ModRegistry.Items.DISK.get(), ModRegistry.Items.TREASURE_DISK.get());
+        tags.tag(ComputerCraftTags.Items.POCKET_COMPUTERS).add(ModRegistry.Items.POCKET_COMPUTER_NORMAL.get(), ModRegistry.Items.POCKET_COMPUTER_ADVANCED.get());
 
         tags.tag(ComputerCraftTags.Items.DYEABLE)
             .addTag(ComputerCraftTags.Items.TURTLE)

projects/common/src/generated/resources/assets/computercraft/lang/en_us.json

@@ -205,8 +205,10 @@
   "item.computercraft.treasure_disk": "Floppy Disk",
   "itemGroup.computercraft": "ComputerCraft",
   "tag.item.computercraft.computer": "Computers",
+  "tag.item.computercraft.disks": "Disks",
   "tag.item.computercraft.dyeable": "Dyable items",
   "tag.item.computercraft.monitor": "Monitors",
+  "tag.item.computercraft.pocket_computers": "Pocket Computers",
   "tag.item.computercraft.turtle": "Turtles",
   "tag.item.computercraft.turtle_can_place": "Turtle-placeable items",
   "tag.item.computercraft.wired_modem": "Wired modems",
@@ -217,7 +219,6 @@
   "tracking_field.computercraft.http_download.name": "HTTP download",
   "tracking_field.computercraft.http_requests.name": "HTTP requests",
   "tracking_field.computercraft.http_upload.name": "HTTP upload",
-  "tracking_field.computercraft.java_allocation.name": "Java Allocations",
   "tracking_field.computercraft.max": "%s (max)",
   "tracking_field.computercraft.peripheral.name": "Peripheral calls",
   "tracking_field.computercraft.server_tasks.name": "Server tasks",

projects/common/src/generated/resources/assets/computercraft/textures/gui/border_advanced.png.mcmeta

@@ -0,0 +1,10 @@
+{
+  "gui": {
+    "scaling": {
+      "type": "nine_slice",
+      "border": 12,
+      "height": 36,
+      "width": 36
+    }
+  }
+}

projects/common/src/generated/resources/assets/computercraft/textures/gui/border_colour.png.mcmeta

@@ -0,0 +1,10 @@
+{
+  "gui": {
+    "scaling": {
+      "type": "nine_slice",
+      "border": 12,
+      "height": 36,
+      "width": 36
+    }
+  }
+}

projects/common/src/generated/resources/assets/computercraft/textures/gui/border_command.png.mcmeta

@@ -0,0 +1,10 @@
+{
+  "gui": {
+    "scaling": {
+      "type": "nine_slice",
+      "border": 12,
+      "height": 36,
+      "width": 36
+    }
+  }
+}

projects/common/src/generated/resources/assets/computercraft/textures/gui/border_normal.png.mcmeta

@@ -0,0 +1,10 @@
+{
+  "gui": {
+    "scaling": {
+      "type": "nine_slice",
+      "border": 12,
+      "height": 36,
+      "width": 36
+    }
+  }
+}

projects/common/src/generated/resources/assets/computercraft/textures/gui/pocket_bottom_advanced.png.mcmeta

@@ -0,0 +1,15 @@
+{
+  "gui": {
+    "scaling": {
+      "type": "nine_slice",
+      "border": {
+        "bottom": 0,
+        "left": 12,
+        "right": 12,
+        "top": 0
+      },
+      "height": 20,
+      "width": 36
+    }
+  }
+}

projects/common/src/generated/resources/assets/computercraft/textures/gui/pocket_bottom_colour.png.mcmeta

@@ -0,0 +1,15 @@
+{
+  "gui": {
+    "scaling": {
+      "type": "nine_slice",
+      "border": {
+        "bottom": 0,
+        "left": 12,
+        "right": 12,
+        "top": 0
+      },
+      "height": 20,
+      "width": 36
+    }
+  }
+}

projects/common/src/generated/resources/assets/computercraft/textures/gui/pocket_bottom_normal.png.mcmeta

@@ -0,0 +1,15 @@
+{
+  "gui": {
+    "scaling": {
+      "type": "nine_slice",
+      "border": {
+        "bottom": 0,
+        "left": 12,
+        "right": 12,
+        "top": 0
+      },
+      "height": 20,
+      "width": 36
+    }
+  }
+}

projects/common/src/generated/resources/assets/computercraft/textures/gui/sidebar_advanced.png.mcmeta

@@ -0,0 +1,15 @@
+{
+  "gui": {
+    "scaling": {
+      "type": "nine_slice",
+      "border": {
+        "bottom": 3,
+        "left": 3,
+        "right": 0,
+        "top": 4
+      },
+      "height": 14,
+      "width": 17
+    }
+  }
+}

projects/common/src/generated/resources/assets/computercraft/textures/gui/sidebar_command.png.mcmeta

@@ -0,0 +1,15 @@
+{
+  "gui": {
+    "scaling": {
+      "type": "nine_slice",
+      "border": {
+        "bottom": 3,
+        "left": 3,
+        "right": 0,
+        "top": 4
+      },
+      "height": 14,
+      "width": 17
+    }
+  }
+}

projects/common/src/generated/resources/assets/computercraft/textures/gui/sidebar_normal.png.mcmeta

@@ -0,0 +1,15 @@
+{
+  "gui": {
+    "scaling": {
+      "type": "nine_slice",
+      "border": {
+        "bottom": 3,
+        "left": 3,
+        "right": 0,
+        "top": 4
+      },
+      "height": 14,
+      "width": 17
+    }
+  }
+}

projects/common/src/generated/resources/data/computercraft/tags/item/disks.json

@@ -0,0 +1 @@
+{"values": ["computercraft:disk", "computercraft:treasure_disk"]}

projects/common/src/generated/resources/data/computercraft/tags/item/pocket_computers.json

@@ -0,0 +1 @@
+{"values": ["computercraft:pocket_computer_normal", "computercraft:pocket_computer_advanced"]}

projects/common/src/main/java/dan200/computercraft/impl/network/wired/WiredNetworkImpl.java

@@ -432,8 +432,8 @@ final class WiredNetworkImpl {
     }
 
     private static WiredNodeImpl checkNode(WiredNode node) {
-        if (node instanceof WiredNodeImpl) {
-            return (WiredNodeImpl) node;
+        if (node instanceof WiredNodeImpl n) {
+            return n;
         } else {
             throw new IllegalArgumentException("Unknown implementation of IWiredNode: " + node);
         }

projects/common/src/main/java/dan200/computercraft/shared/CommonHooks.java

@@ -13,7 +13,10 @@ import dan200.computercraft.shared.lectern.CustomLecternBlock;
 import dan200.computercraft.shared.peripheral.monitor.MonitorWatcher;
 import dan200.computercraft.shared.util.DropConsumer;
 import dan200.computercraft.shared.util.TickScheduler;
+import net.minecraft.core.component.DataComponentType;
+import net.minecraft.core.component.DataComponents;
 import net.minecraft.core.registries.Registries;
+import net.minecraft.network.chat.Component;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.server.MinecraftServer;
@@ -25,9 +28,8 @@ import net.minecraft.world.InteractionHand;
 import net.minecraft.world.InteractionResult;
 import net.minecraft.world.entity.Entity;
 import net.minecraft.world.entity.player.Player;
-import net.minecraft.world.item.CreativeModeTab;
-import net.minecraft.world.item.CreativeModeTabs;
-import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.*;
+import net.minecraft.world.item.component.TooltipProvider;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.LecternBlock;
@@ -40,8 +42,10 @@ import net.minecraft.world.level.storage.loot.providers.number.ConstantValue;
 import net.minecraft.world.phys.BlockHitResult;
 import org.jspecify.annotations.Nullable;
 
+import java.util.List;
 import java.util.Set;
 import java.util.function.BiConsumer;
+import java.util.function.Consumer;
 
 /**
  * Event listeners for server/common code.
@@ -163,4 +167,42 @@ public final class CommonHooks {
             out.accept(ModRegistry.Items.COMPUTER_COMMAND.get());
         }
     }
+
+    public static void onItemTooltip(ItemStack stack, Item.TooltipContext context, TooltipFlag flags, List<Component> out) {
+        var appender = new TooltipAppender(out);
+        addToTooltip(stack, ModRegistry.DataComponents.PRINTOUT.get(), context, appender, flags);
+        addToTooltip(stack, ModRegistry.DataComponents.TREASURE_DISK.get(), context, appender, flags);
+
+        // Disk and computer IDs require some conditional logic, so we don't bother using TooltipProvider.
+
+        var diskId = stack.get(ModRegistry.DataComponents.DISK_ID.get());
+        if (diskId != null && flags.isAdvanced()) diskId.addToTooltip("gui.computercraft.tooltip.disk_id", appender);
+
+        var computerId = stack.get(ModRegistry.DataComponents.COMPUTER_ID.get());
+        if (computerId != null && (flags.isAdvanced() || !stack.has(DataComponents.CUSTOM_NAME))) {
+            computerId.addToTooltip("gui.computercraft.tooltip.computer_id", appender);
+        }
+    }
+
+    /**
+     * Inserts additional tooltip items directly after the custom name, rather than at the very end.
+     */
+    private static final class TooltipAppender implements Consumer<Component> {
+        private final List<Component> out;
+        private int index = 1;
+
+        private TooltipAppender(List<Component> out) {
+            this.out = out;
+        }
+
+        @Override
+        public void accept(Component component) {
+            out.add(index++, component);
+        }
+    }
+
+    private static <T extends TooltipProvider> void addToTooltip(ItemStack stack, DataComponentType<T> component, Item.TooltipContext context, Consumer<Component> out, TooltipFlag flags) {
+        var provider = stack.get(component);
+        if (provider != null) provider.addToTooltip(context, out, flags);
+    }
 }

projects/common/src/main/java/dan200/computercraft/shared/ModRegistry.java

@@ -34,9 +34,8 @@ import dan200.computercraft.shared.computer.blocks.ComputerBlock;
 import dan200.computercraft.shared.computer.blocks.ComputerBlockEntity;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.core.ServerComputer;
+import dan200.computercraft.shared.computer.core.TerminalSize;
 import dan200.computercraft.shared.computer.inventory.ComputerMenuWithoutInventory;
-import dan200.computercraft.shared.computer.items.ComputerItem;
-import dan200.computercraft.shared.computer.items.CommandComputerItem;
 import dan200.computercraft.shared.computer.items.ServerComputerReference;
 import dan200.computercraft.shared.config.Config;
 import dan200.computercraft.shared.data.BlockNamedEntityLootCondition;
@@ -112,10 +111,7 @@ import net.minecraft.network.codec.ByteBufCodecs;
 import net.minecraft.network.codec.StreamCodec;
 import net.minecraft.world.flag.FeatureFlags;
 import net.minecraft.world.inventory.MenuType;
-import net.minecraft.world.item.BlockItem;
-import net.minecraft.world.item.CreativeModeTab;
-import net.minecraft.world.item.Item;
-import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.*;
 import net.minecraft.world.item.component.DyedItemColor;
 import net.minecraft.world.item.crafting.CustomRecipe;
 import net.minecraft.world.item.crafting.Recipe;
@@ -262,9 +258,9 @@ public final class ModRegistry {
             return REGISTRY.register(parent.id().getPath(), () -> supplier.apply(parent.get(), properties()));
         }
 
-        public static final RegistryEntry<ComputerItem> COMPUTER_NORMAL = ofBlock(Blocks.COMPUTER_NORMAL, ComputerItem::new);
-        public static final RegistryEntry<ComputerItem> COMPUTER_ADVANCED = ofBlock(Blocks.COMPUTER_ADVANCED, ComputerItem::new);
-        public static final RegistryEntry<ComputerItem> COMPUTER_COMMAND = ofBlock(Blocks.COMPUTER_COMMAND, CommandComputerItem::new);
+        public static final RegistryEntry<BlockItem> COMPUTER_NORMAL = ofBlock(Blocks.COMPUTER_NORMAL, BlockItem::new);
+        public static final RegistryEntry<BlockItem> COMPUTER_ADVANCED = ofBlock(Blocks.COMPUTER_ADVANCED, BlockItem::new);
+        public static final RegistryEntry<GameMasterBlockItem> COMPUTER_COMMAND = ofBlock(Blocks.COMPUTER_COMMAND, GameMasterBlockItem::new);
 
         public static final RegistryEntry<PocketComputerItem> POCKET_COMPUTER_NORMAL = REGISTRY.register("pocket_computer_normal",
             () -> new PocketComputerItem(properties().stacksTo(1), ComputerFamily.NORMAL));
@@ -276,19 +272,19 @@ public final class ModRegistry {
 
         public static final RegistryEntry<DiskItem> DISK =
             REGISTRY.register("disk", () -> new DiskItem(properties().stacksTo(1)));
-        public static final RegistryEntry<TreasureDiskItem> TREASURE_DISK =
-            REGISTRY.register("treasure_disk", () -> new TreasureDiskItem(properties().stacksTo(1)));
+        public static final RegistryEntry<DiskItem> TREASURE_DISK =
+            REGISTRY.register("treasure_disk", () -> new DiskItem(properties().stacksTo(1)));
 
         private static Item.Properties printoutProperties() {
             return properties().stacksTo(1).component(DataComponents.PRINTOUT.get(), PrintoutData.EMPTY);
         }
 
         public static final RegistryEntry<PrintoutItem> PRINTED_PAGE = REGISTRY.register("printed_page",
-            () -> new PrintoutItem(printoutProperties(), PrintoutItem.Type.PAGE));
+            () -> new PrintoutItem(printoutProperties()));
         public static final RegistryEntry<PrintoutItem> PRINTED_PAGES = REGISTRY.register("printed_pages",
-            () -> new PrintoutItem(printoutProperties(), PrintoutItem.Type.PAGES));
+            () -> new PrintoutItem(printoutProperties()));
         public static final RegistryEntry<PrintoutItem> PRINTED_BOOK = REGISTRY.register("printed_book",
-            () -> new PrintoutItem(printoutProperties(), PrintoutItem.Type.BOOK));
+            () -> new PrintoutItem(printoutProperties()));
 
         public static final RegistryEntry<BlockItem> SPEAKER = ofBlock(Blocks.SPEAKER, BlockItem::new);
         public static final RegistryEntry<BlockItem> DISK_DRIVE = ofBlock(Blocks.DISK_DRIVE, BlockItem::new);
@@ -315,9 +311,6 @@ public final class ModRegistry {
 
         /**
          * The id of a computer.
-         *
-         * @see ComputerItem
-         * @see PocketComputerItem
          */
         public static final RegistryEntry<DataComponentType<NonNegativeId>> COMPUTER_ID = register("computer_id", b -> b
             .persistent(NonNegativeId.CODEC).networkSynchronized(NonNegativeId.STREAM_CODEC)
@@ -325,15 +318,18 @@ public final class ModRegistry {
 
         /**
          * The storage capacity of a computer or disk.
-         *
-         * @see ComputerItem
-         * @see PocketComputerItem
-         * @see DiskItem
          */
         public static final RegistryEntry<DataComponentType<StorageCapacity>> STORAGE_CAPACITY = register("storage_capacity", b -> b
             .persistent(StorageCapacity.CODEC).networkSynchronized(StorageCapacity.STREAM_CODEC)
         );
 
+        /**
+         * The terminal size of a computer.
+         */
+        public static final RegistryEntry<DataComponentType<TerminalSize>> TERMINAL_SIZE = register("terminal_size", b -> b
+            .persistent(TerminalSize.CODEC).networkSynchronized(TerminalSize.STREAM_CODEC)
+        );
+
         /**
          * The left upgrade of a turtle.
          *
@@ -397,9 +393,6 @@ public final class ModRegistry {
 
         /**
          * Information about a treasure disk's mount.
-         *
-         * @see TreasureDiskItem
-         * @see TreasureDisk
          */
         public static final RegistryEntry<DataComponentType<TreasureDisk>> TREASURE_DISK = register("treasure_disk", b -> b
             .persistent(TreasureDisk.CODEC).networkSynchronized(TreasureDisk.STREAM_CODEC)
@@ -407,8 +400,6 @@ public final class ModRegistry {
 
         /**
          * The id of a disk.
-         *
-         * @see DiskItem
          */
         public static final RegistryEntry<DataComponentType<NonNegativeId>> DISK_ID = register("disk_id", b -> b
             .persistent(NonNegativeId.CODEC).networkSynchronized(NonNegativeId.STREAM_CODEC)

projects/common/src/main/java/dan200/computercraft/shared/command/UserLevel.java

@@ -50,6 +50,12 @@ public enum UserLevel implements Predicate<CommandSourceStack> {
 
     public static boolean isOwner(CommandSourceStack source) {
         var server = source.getServer();
+
+        // While CommandSourceStack.getServer is non-nullable, that's a lie for permission checks. When loading
+        // .mcfunction files, ServerFunctionLibrary constructs an instance with an empty server. In that case, return
+        // false — we don't want to treat functions as an owner!
+        if (server == null) return false;
+
         var player = source.getPlayer();
         return server.isDedicatedServer()
             ? source.getEntity() == null && source.hasPermission(4) && source.getTextName().equals("Server")

projects/common/src/main/java/dan200/computercraft/shared/command/builder/HelpingArgumentBuilder.java

@@ -66,8 +66,8 @@ public final class HelpingArgumentBuilder extends LiteralArgumentBuilder<Command
     public LiteralArgumentBuilder<CommandSourceStack> then(final ArgumentBuilder<CommandSourceStack, ?> argument) {
         if (getRedirect() != null) throw new IllegalStateException("Cannot add children to a redirected node");
 
-        if (argument instanceof HelpingArgumentBuilder) {
-            children.add((HelpingArgumentBuilder) argument);
+        if (argument instanceof HelpingArgumentBuilder child) {
+            children.add(child);
         } else if (argument instanceof LiteralArgumentBuilder) {
             super.then(argument);
         } else {

projects/common/src/main/java/dan200/computercraft/shared/computer/blocks/AbstractComputerBlock.java

@@ -4,14 +4,15 @@
 
 package dan200.computercraft.shared.computer.blocks;
 
-import dan200.computercraft.annotations.ForgeOverride;
 import dan200.computercraft.shared.common.IBundledRedstoneBlock;
 import dan200.computercraft.shared.network.container.ComputerContainerData;
 import dan200.computercraft.shared.platform.PlatformHelper;
 import dan200.computercraft.shared.platform.RegistryEntry;
 import dan200.computercraft.shared.util.BlockEntityHelpers;
+import net.minecraft.Util;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
+import net.minecraft.core.component.DataComponentMap;
 import net.minecraft.world.InteractionResult;
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.item.ItemStack;
@@ -64,12 +65,6 @@ public abstract class AbstractComputerBlock<T extends AbstractComputerBlockEntit
         return computer.getRedstoneOutput(localSide);
     }
 
-    private ItemStack getItem(AbstractComputerBlockEntity tile) {
-        var stack = new ItemStack(this);
-        stack.applyComponents(tile.collectComponents());
-        return stack;
-    }
-
     @Override
     protected int getSignal(BlockState state, BlockGetter world, BlockPos pos, Direction incomingSide) {
         return getDirectSignal(state, world, pos, incomingSide);
@@ -89,13 +84,11 @@ public abstract class AbstractComputerBlock<T extends AbstractComputerBlockEntit
 
     @Override
     public ItemStack getCloneItemStack(LevelReader world, BlockPos pos, BlockState state) {
-        var tile = world.getBlockEntity(pos);
-        if (tile instanceof AbstractComputerBlockEntity computer) {
-            var result = getItem(computer);
-            if (!result.isEmpty()) return result;
+        var stack = super.getCloneItemStack(world, pos, state);
+        if (world.getBlockEntity(pos) instanceof AbstractComputerBlockEntity computer) {
+            stack.applyComponents(computer.collectComponents());
         }
-
-        return super.getCloneItemStack(world, pos, state);
+        return stack;
     }
 
     @Override
@@ -121,7 +114,10 @@ public abstract class AbstractComputerBlock<T extends AbstractComputerBlockEntit
                 var serverComputer = computer.createServerComputer();
                 serverComputer.turnOn();
 
-                PlatformHelper.get().openMenu(player, computer.getName(), computer, new ComputerContainerData(serverComputer, getItem(computer)));
+                var stack = new ItemStack(this);
+                stack.applyComponents(Util.make(DataComponentMap.builder(), computer::collectSafeComponents).build());
+
+                PlatformHelper.get().openMenu(player, computer.getName(), computer, new ComputerContainerData(serverComputer, stack));
             }
             return InteractionResult.sidedSuccess(level.isClientSide);
         }
@@ -135,12 +131,6 @@ public abstract class AbstractComputerBlock<T extends AbstractComputerBlockEntit
         if (be instanceof AbstractComputerBlockEntity computer) computer.neighborChanged(neighbourPos);
     }
 
-    @ForgeOverride
-    public final void onNeighborChange(BlockState state, LevelReader world, BlockPos pos, BlockPos neighbour) {
-        var be = world.getBlockEntity(pos);
-        if (be instanceof AbstractComputerBlockEntity computer) computer.neighborChanged(neighbour);
-    }
-
     @Override
     protected BlockState updateShape(BlockState state, Direction direction, BlockState neighborState, LevelAccessor level, BlockPos pos, BlockPos neighborPos) {
         var be = level.getBlockEntity(pos);

projects/common/src/main/java/dan200/computercraft/shared/computer/blocks/AbstractComputerBlockEntity.java

@@ -5,6 +5,7 @@
 package dan200.computercraft.shared.computer.blocks;
 
 import com.google.common.base.Strings;
+import com.google.errorprone.annotations.OverridingMethodsMustInvokeSuper;
 import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.core.computer.ComputerSide;
@@ -187,10 +188,20 @@ public abstract class AbstractComputerBlockEntity extends BlockEntity implements
     @Override
     protected void collectImplicitComponents(DataComponentMap.Builder builder) {
         super.collectImplicitComponents(builder);
+        collectSafeComponents(builder);
+        if (lockCode != LockCode.NO_LOCK) builder.set(DataComponents.LOCK, lockCode);
+    }
+
+    /**
+     * Collect components that are safe to share with the client.
+     *
+     * @param builder The component builder.
+     */
+    @OverridingMethodsMustInvokeSuper
+    protected void collectSafeComponents(DataComponentMap.Builder builder) {
         builder.set(ModRegistry.DataComponents.COMPUTER_ID.get(), NonNegativeId.of(computerID));
         builder.set(DataComponents.CUSTOM_NAME, label == null ? null : Component.literal(label));
         builder.set(ModRegistry.DataComponents.STORAGE_CAPACITY.get(), storageCapacity > 0 ? new StorageCapacity(storageCapacity) : null);
-        if (lockCode != LockCode.NO_LOCK) builder.set(DataComponents.LOCK, lockCode);
     }
 
     @Override

projects/common/src/main/java/dan200/computercraft/shared/computer/blocks/CommandComputerBlock.java

@@ -16,7 +16,6 @@ import net.minecraft.world.level.block.entity.BlockEntityType;
  * permission.
  *
  * @param <T> The type of the computer block entity.
- * @see dan200.computercraft.shared.computer.items.CommandComputerItem
  */
 public class CommandComputerBlock<T extends ComputerBlockEntity> extends ComputerBlock<T> implements GameMasterBlock {
     private static final MapCodec<CommandComputerBlock<?>> CODEC = RecordCodecBuilder.mapCodec(instance -> instance.group(

projects/common/src/main/java/dan200/computercraft/shared/computer/blocks/ComputerBlockEntity.java

@@ -10,10 +10,15 @@ import dan200.computercraft.shared.ModRegistry;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.core.ComputerState;
 import dan200.computercraft.shared.computer.core.ServerComputer;
+import dan200.computercraft.shared.computer.core.TerminalSize;
 import dan200.computercraft.shared.computer.inventory.ComputerMenuWithoutInventory;
 import dan200.computercraft.shared.config.ConfigSpec;
+import dan200.computercraft.shared.util.NBTUtil;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
+import net.minecraft.core.HolderLookup;
+import net.minecraft.core.component.DataComponentMap;
+import net.minecraft.nbt.CompoundTag;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.entity.player.Inventory;
 import net.minecraft.world.entity.player.Player;
@@ -23,17 +28,66 @@ import net.minecraft.world.level.block.state.BlockState;
 import org.jspecify.annotations.Nullable;
 
 public class ComputerBlockEntity extends AbstractComputerBlockEntity {
+    private static final String NBT_TERMINAL_SIZE = "TerminalSize";
+
+    private @Nullable TerminalSize terminalSize;
+
     private @Nullable IPeripheral peripheral;
 
     public ComputerBlockEntity(BlockEntityType<? extends ComputerBlockEntity> type, BlockPos pos, BlockState state, ComputerFamily family) {
         super(type, pos, state, family);
     }
 
+    @Override
+    protected void loadServer(CompoundTag nbt, HolderLookup.Provider registries) {
+        super.loadServer(nbt, registries);
+        terminalSize = NBTUtil.decodeFrom(TerminalSize.CODEC, registries, nbt, NBT_TERMINAL_SIZE);
+    }
+
+    @Override
+    public void saveAdditional(CompoundTag nbt, HolderLookup.Provider registries) {
+        super.saveAdditional(nbt, registries);
+        NBTUtil.encodeTo(TerminalSize.CODEC, registries, nbt, NBT_TERMINAL_SIZE, terminalSize);
+    }
+
+    @Override
+    protected void loadClient(CompoundTag nbt, HolderLookup.Provider registries) {
+        super.loadClient(nbt, registries);
+        terminalSize = NBTUtil.decodeFrom(TerminalSize.CODEC, registries, nbt, NBT_TERMINAL_SIZE);
+    }
+
+    @Override
+    public CompoundTag getUpdateTag(HolderLookup.Provider registries) {
+        var tag = super.getUpdateTag(registries);
+        NBTUtil.encodeTo(TerminalSize.CODEC, registries, tag, NBT_TERMINAL_SIZE, terminalSize);
+        return tag;
+    }
+
+    @Override
+    protected void applyImplicitComponents(DataComponentInput component) {
+        super.applyImplicitComponents(component);
+        terminalSize = component.get(ModRegistry.DataComponents.TERMINAL_SIZE.get());
+    }
+
+
+    @Override
+    protected void collectSafeComponents(DataComponentMap.Builder builder) {
+        super.collectSafeComponents(builder);
+        builder.set(ModRegistry.DataComponents.TERMINAL_SIZE.get(), terminalSize);
+    }
+
+    @Override
+    @Deprecated
+    public void removeComponentsFromTag(CompoundTag tag) {
+        super.removeComponentsFromTag(tag);
+        tag.remove(NBT_TERMINAL_SIZE);
+    }
+
     @Override
     protected ServerComputer createComputer(int id) {
         return new ServerComputer((ServerLevel) getLevel(), getBlockPos(), ServerComputer.properties(id, getFamily())
             .label(getLabel())
-            .terminalSize(ConfigSpec.computerTermWidth.get(), ConfigSpec.computerTermHeight.get())
+            .terminalSize(terminalSize != null ? terminalSize : new TerminalSize(ConfigSpec.computerTermWidth.get(), ConfigSpec.computerTermHeight.get()))
             .storageCapacity(storageCapacity)
         );
     }

projects/common/src/main/java/dan200/computercraft/shared/computer/core/ServerComputer.java

@@ -295,10 +295,9 @@ public class ServerComputer implements ComputerEnvironment, ComputerEvents.Recei
             return this;
         }
 
-        public Properties terminalSize(int width, int height) {
-            if (width <= 0 || height <= 0) throw new IllegalArgumentException("Terminal size must be positive");
-            this.terminalWidth = width;
-            this.terminalHeight = height;
+        public Properties terminalSize(TerminalSize size) {
+            this.terminalWidth = size.width();
+            this.terminalHeight = size.height();
             return this;
         }
 

projects/common/src/main/java/dan200/computercraft/shared/computer/core/TerminalSize.java

@@ -0,0 +1,43 @@
+// SPDX-FileCopyrightText: 2025 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.shared.computer.core;
+
+import com.mojang.serialization.Codec;
+import com.mojang.serialization.codecs.RecordCodecBuilder;
+import io.netty.buffer.ByteBuf;
+import net.minecraft.network.codec.ByteBufCodecs;
+import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.util.ExtraCodecs;
+
+/**
+ * The size of a computer terminal.
+ *
+ * @param width  The terminal's width.
+ * @param height The terminal's height.
+ */
+public record TerminalSize(int width, int height) {
+    public static final int MAX_SIZE = 255;
+    public static final Codec<TerminalSize> CODEC = RecordCodecBuilder.create(instance -> instance.group(
+        ExtraCodecs.intRange(1, MAX_SIZE).fieldOf("width").forGetter(TerminalSize::width),
+        ExtraCodecs.intRange(1, MAX_SIZE).fieldOf("height").forGetter(TerminalSize::height)
+    ).apply(instance, TerminalSize::new));
+
+    public static final StreamCodec<ByteBuf, TerminalSize> STREAM_CODEC = StreamCodec.composite(
+        ByteBufCodecs.VAR_INT, TerminalSize::width,
+        ByteBufCodecs.VAR_INT, TerminalSize::height,
+        TerminalSize::new
+    );
+
+    public TerminalSize {
+        checkBounds("width", width);
+        checkBounds("height", height);
+    }
+
+    private static void checkBounds(String name, int value) {
+        if (value < 1 || value > MAX_SIZE) {
+            throw new IllegalArgumentException(name + " must be between 1 and " + MAX_SIZE);
+        }
+    }
+}

projects/common/src/main/java/dan200/computercraft/shared/computer/items/CommandComputerItem.java

@@ -1,29 +0,0 @@
-// SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers
-//
-// SPDX-License-Identifier: MPL-2.0
-
-package dan200.computercraft.shared.computer.items;
-
-import dan200.computercraft.shared.computer.blocks.ComputerBlock;
-import net.minecraft.world.item.context.BlockPlaceContext;
-import net.minecraft.world.level.block.state.BlockState;
-import org.jspecify.annotations.Nullable;
-
-/**
- * A {@link ComputerItem} which prevents players placing it without permission.
- *
- * @see net.minecraft.world.item.GameMasterBlockItem
- * @see dan200.computercraft.shared.computer.blocks.CommandComputerBlock
- */
-public class CommandComputerItem extends ComputerItem {
-    public CommandComputerItem(ComputerBlock<?> block, Properties settings) {
-        super(block, settings);
-    }
-
-    @Override
-    protected @Nullable BlockState getPlacementState(BlockPlaceContext context) {
-        // Prohibit players placing this block in survival or when not opped.
-        var player = context.getPlayer();
-        return player != null && !player.canUseGameMasterBlocks() ? null : super.getPlacementState(context);
-    }
-}

projects/common/src/main/java/dan200/computercraft/shared/computer/items/ComputerItem.java

@@ -1,33 +0,0 @@
-// Copyright Daniel Ratcliffe, 2011-2022. Do not distribute without permission.
-//
-// SPDX-License-Identifier: LicenseRef-CCPL
-
-package dan200.computercraft.shared.computer.items;
-
-import dan200.computercraft.shared.ModRegistry;
-import dan200.computercraft.shared.computer.blocks.AbstractComputerBlock;
-import net.minecraft.ChatFormatting;
-import net.minecraft.core.component.DataComponents;
-import net.minecraft.network.chat.Component;
-import net.minecraft.world.item.BlockItem;
-import net.minecraft.world.item.ItemStack;
-import net.minecraft.world.item.TooltipFlag;
-
-import java.util.List;
-
-public class ComputerItem extends BlockItem {
-    public ComputerItem(AbstractComputerBlock<?> block, Properties settings) {
-        super(block, settings);
-    }
-
-    @Override
-    public void appendHoverText(ItemStack stack, TooltipContext context, List<Component> list, TooltipFlag options) {
-        if (options.isAdvanced() || !stack.has(DataComponents.CUSTOM_NAME)) {
-            var id = stack.get(ModRegistry.DataComponents.COMPUTER_ID.get());
-            if (id != null) {
-                list.add(Component.translatable("gui.computercraft.tooltip.computer_id", id.id())
-                    .withStyle(ChatFormatting.GRAY));
-            }
-        }
-    }
-}

projects/common/src/main/java/dan200/computercraft/shared/computer/menu/ServerInputState.java

@@ -74,7 +74,7 @@ public class ServerInputState<T extends AbstractContainerMenu & ComputerMenu> im
     }
 
     private static boolean isValidClipboard(ByteBuffer buffer) {
-        for (int i = buffer.remaining(), max = buffer.limit(); i < max; i++) {
+        for (int i = buffer.position(), max = buffer.limit(); i < max; i++) {
             if (!StringUtil.isTypableChar(buffer.get(i))) return false;
         }
         return true;

projects/common/src/main/java/dan200/computercraft/shared/config/ConfigSpec.java

@@ -11,6 +11,7 @@ import dan200.computercraft.core.Logging;
 import dan200.computercraft.core.apis.http.NetworkUtils;
 import dan200.computercraft.core.apis.http.options.ProxyType;
 import dan200.computercraft.core.computer.mainthread.MainThreadConfig;
+import dan200.computercraft.shared.computer.core.TerminalSize;
 import dan200.computercraft.shared.peripheral.monitor.MonitorRenderer;
 import dan200.computercraft.shared.platform.PlatformHelper;
 import org.apache.logging.log4j.LogManager;
@@ -344,13 +345,13 @@ public final class ConfigSpec {
                 .push("term_sizes");
 
             builder.comment("Terminal size of computers.").push("computer");
-            computerTermWidth = builder.comment("Width of computer terminal").defineInRange("width", Config.DEFAULT_COMPUTER_TERM_WIDTH, 1, 255);
-            computerTermHeight = builder.comment("Height of computer terminal").defineInRange("height", Config.DEFAULT_COMPUTER_TERM_HEIGHT, 1, 255);
+            computerTermWidth = builder.comment("Width of computer terminal").defineInRange("width", Config.DEFAULT_COMPUTER_TERM_WIDTH, 1, TerminalSize.MAX_SIZE);
+            computerTermHeight = builder.comment("Height of computer terminal").defineInRange("height", Config.DEFAULT_COMPUTER_TERM_HEIGHT, 1, TerminalSize.MAX_SIZE);
             builder.pop();
 
             builder.comment("Terminal size of pocket computers.").push("pocket_computer");
-            pocketTermWidth = builder.comment("Width of pocket computer terminal").defineInRange("width", Config.DEFAULT_POCKET_TERM_WIDTH, 1, 255);
-            pocketTermHeight = builder.comment("Height of pocket computer terminal").defineInRange("height", Config.DEFAULT_POCKET_TERM_HEIGHT, 1, 255);
+            pocketTermWidth = builder.comment("Width of pocket computer terminal").defineInRange("width", Config.DEFAULT_POCKET_TERM_WIDTH, 1, TerminalSize.MAX_SIZE);
+            pocketTermHeight = builder.comment("Height of pocket computer terminal").defineInRange("height", Config.DEFAULT_POCKET_TERM_HEIGHT, 1, TerminalSize.MAX_SIZE);
             builder.pop();
 
             builder.comment("Maximum size of monitors (in blocks).").push("monitor");

projects/common/src/main/java/dan200/computercraft/shared/media/MountMedia.java

@@ -8,9 +8,7 @@ import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.api.filesystem.Mount;
 import dan200.computercraft.api.media.IMedia;
 import dan200.computercraft.shared.ModRegistry;
-import dan200.computercraft.shared.computer.items.ComputerItem;
 import dan200.computercraft.shared.config.ConfigSpec;
-import dan200.computercraft.shared.media.items.DiskItem;
 import dan200.computercraft.shared.util.DataComponentUtil;
 import dan200.computercraft.shared.util.NonNegativeId;
 import dan200.computercraft.shared.util.StorageCapacity;
@@ -27,12 +25,12 @@ import java.util.function.Supplier;
  */
 public final class MountMedia implements IMedia {
     /**
-     * A {@link MountMedia} implementation for {@linkplain ComputerItem computers}.
+     * A {@link MountMedia} implementation for {@linkplain ModRegistry.DataComponents#COMPUTER_ID computers}.
      */
     public static final IMedia COMPUTER = new MountMedia("computer", ModRegistry.DataComponents.COMPUTER_ID, false, ConfigSpec.computerSpaceLimit);
 
     /**
-     * A {@link MountMedia} implementation for {@linkplain DiskItem disks}.
+     * A {@link MountMedia} implementation for {@linkplain ModRegistry.Items#DISK disks}.
      */
     public static final IMedia DISK = new MountMedia("disk", ModRegistry.DataComponents.DISK_ID, true, ConfigSpec.floppySpaceLimit);
 

projects/common/src/main/java/dan200/computercraft/shared/media/items/DiskItem.java

@@ -1,51 +1,24 @@
-// Copyright Daniel Ratcliffe, 2011-2022. Do not distribute without permission.
+// SPDX-FileCopyrightText: 2025 The CC: Tweaked Developers
 //
-// SPDX-License-Identifier: LicenseRef-CCPL
+// SPDX-License-Identifier: MPL-2.0
 
 package dan200.computercraft.shared.media.items;
 
-import dan200.computercraft.annotations.ForgeOverride;
-import dan200.computercraft.core.util.Colour;
-import dan200.computercraft.shared.ModRegistry;
-import dan200.computercraft.shared.util.NonNegativeId;
-import net.minecraft.ChatFormatting;
-import net.minecraft.core.BlockPos;
-import net.minecraft.network.chat.Component;
-import net.minecraft.world.entity.player.Player;
+import dan200.computercraft.shared.peripheral.diskdrive.DiskDriveBlock;
+import net.minecraft.world.InteractionResult;
 import net.minecraft.world.item.Item;
-import net.minecraft.world.item.ItemStack;
-import net.minecraft.world.item.TooltipFlag;
-import net.minecraft.world.item.component.DyedItemColor;
-import net.minecraft.world.level.LevelReader;
-
-import java.util.List;
+import net.minecraft.world.item.context.UseOnContext;
 
+/**
+ * An item that can be shift-right-clicked into a {@link DiskDriveBlock}.
+ */
 public class DiskItem extends Item {
     public DiskItem(Properties settings) {
         super(settings);
     }
 
     @Override
-    public void appendHoverText(ItemStack stack, TooltipContext context, List<Component> list, TooltipFlag options) {
-        if (options.isAdvanced()) {
-            var id = stack.get(ModRegistry.DataComponents.DISK_ID.get());
-            if (id != null) {
-                list.add(Component.translatable("gui.computercraft.tooltip.disk_id", id.id())
-                    .withStyle(ChatFormatting.GRAY));
-            }
-        }
-    }
-
-    @ForgeOverride
-    public boolean doesSneakBypassUse(ItemStack stack, LevelReader world, BlockPos pos, Player player) {
-        return true;
-    }
-
-    public static int getDiskID(ItemStack stack) {
-        return NonNegativeId.getId(stack.get(ModRegistry.DataComponents.DISK_ID.get()));
-    }
-
-    public static int getColour(ItemStack stack) {
-        return DyedItemColor.getOrDefault(stack, Colour.WHITE.getARGB());
+    public InteractionResult useOn(UseOnContext context) {
+        return DiskDriveBlock.defaultUseItemOn(context);
     }
 }

projects/common/src/main/java/dan200/computercraft/shared/media/items/PrintoutData.java

@@ -12,11 +12,16 @@ import dan200.computercraft.core.terminal.Terminal;
 import dan200.computercraft.shared.ModRegistry;
 import io.netty.buffer.ByteBuf;
 import net.minecraft.core.component.DataComponentHolder;
+import net.minecraft.network.chat.Component;
 import net.minecraft.network.codec.ByteBufCodecs;
 import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.TooltipFlag;
+import net.minecraft.world.item.component.TooltipProvider;
 
 import java.util.Arrays;
 import java.util.List;
+import java.util.function.Consumer;
 import java.util.stream.Stream;
 
 /**
@@ -27,7 +32,7 @@ import java.util.stream.Stream;
  * @see PrintoutItem
  * @see dan200.computercraft.shared.ModRegistry.DataComponents#PRINTOUT
  */
-public record PrintoutData(String title, List<Line> lines) implements PrintoutContents {
+public record PrintoutData(String title, List<Line> lines) implements PrintoutContents, TooltipProvider {
     public static final int LINE_LENGTH = 25;
     public static final int LINES_PER_PAGE = 21;
     public static final int MAX_PAGES = 16;
@@ -71,6 +76,11 @@ public record PrintoutData(String title, List<Line> lines) implements PrintoutCo
         PrintoutData::new
     );
 
+    @Override
+    public void addToTooltip(Item.TooltipContext context, Consumer<Component> out, TooltipFlag flag) {
+        if (!title().isEmpty()) out.accept(Component.literal(title()));
+    }
+
     /**
      * A single line on our printed pages.
      *

projects/common/src/main/java/dan200/computercraft/shared/media/items/PrintoutItem.java

@@ -14,29 +14,11 @@ import net.minecraft.world.SimpleMenuProvider;
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.ItemStack;
-import net.minecraft.world.item.TooltipFlag;
 import net.minecraft.world.level.Level;
 
-import java.util.List;
-
 public class PrintoutItem extends Item {
-    public enum Type {
-        PAGE,
-        PAGES,
-        BOOK
-    }
-
-    private final Type type;
-
-    public PrintoutItem(Properties settings, Type type) {
+    public PrintoutItem(Properties settings) {
         super(settings);
-        this.type = type;
-    }
-
-    @Override
-    public void appendHoverText(ItemStack stack, TooltipContext context, List<Component> list, TooltipFlag options) {
-        var title = PrintoutData.getOrEmpty(stack).title();
-        if (!title.isEmpty()) list.add(Component.literal(title));
     }
 
     @Override
@@ -49,8 +31,4 @@ public class PrintoutItem extends Item {
         }
         return new InteractionResultHolder<>(InteractionResult.sidedSuccess(world.isClientSide), stack);
     }
-
-    public Type getType() {
-        return type;
-    }
 }

projects/common/src/main/java/dan200/computercraft/shared/media/items/TreasureDisk.java

@@ -9,17 +9,25 @@ import com.mojang.serialization.codecs.RecordCodecBuilder;
 import dan200.computercraft.shared.ModRegistry;
 import net.minecraft.core.component.DataComponentHolder;
 import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.network.chat.Component;
 import net.minecraft.network.codec.ByteBufCodecs;
 import net.minecraft.network.codec.StreamCodec;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.TooltipFlag;
+import net.minecraft.world.item.component.TooltipProvider;
+
+import java.util.function.Consumer;
 
 /**
- * Stores information about a {@linkplain TreasureDiskItem treasure disk's} mount.
+ * Stores information about a {@linkplain ModRegistry.Items#TREASURE_DISK treasure disk's} mount.
  *
  * @param name The name/title of the disk.
  * @param path The subpath to the resource
  * @see ModRegistry.DataComponents#TREASURE_DISK
  */
-public record TreasureDisk(String name, String path) {
+public record TreasureDisk(String name, String path) implements TooltipProvider {
+    public static final TreasureDisk UNDEFINED = new TreasureDisk("'missingno' by how did you get this anyway?", "undefined");
+
     public static final Codec<TreasureDisk> CODEC = RecordCodecBuilder.create(i -> i.group(
         Codec.STRING.fieldOf("name").forGetter(TreasureDisk::name),
         Codec.STRING.fieldOf("path").forGetter(TreasureDisk::path)
@@ -32,7 +40,11 @@ public record TreasureDisk(String name, String path) {
     );
 
     public static String getTitle(DataComponentHolder holder) {
-        var nbt = holder.get(ModRegistry.DataComponents.TREASURE_DISK.get());
-        return nbt != null ? nbt.name() : "'missingno' by how did you get this anyway?";
+        return holder.getOrDefault(ModRegistry.DataComponents.TREASURE_DISK.get(), UNDEFINED).name();
+    }
+
+    @Override
+    public void addToTooltip(Item.TooltipContext context, Consumer<Component> out, TooltipFlag flags) {
+        out.accept(Component.literal(name()));
     }
 }

projects/common/src/main/java/dan200/computercraft/shared/media/items/TreasureDiskItem.java

@@ -1,32 +0,0 @@
-// Copyright Daniel Ratcliffe, 2011-2022. Do not distribute without permission.
-//
-// SPDX-License-Identifier: LicenseRef-CCPL
-
-package dan200.computercraft.shared.media.items;
-
-import dan200.computercraft.annotations.ForgeOverride;
-import net.minecraft.core.BlockPos;
-import net.minecraft.network.chat.Component;
-import net.minecraft.world.entity.player.Player;
-import net.minecraft.world.item.Item;
-import net.minecraft.world.item.ItemStack;
-import net.minecraft.world.item.TooltipFlag;
-import net.minecraft.world.level.LevelReader;
-
-import java.util.List;
-
-public class TreasureDiskItem extends Item {
-    public TreasureDiskItem(Properties settings) {
-        super(settings);
-    }
-
-    @Override
-    public void appendHoverText(ItemStack stack, TooltipContext context, List<Component> list, TooltipFlag tooltipOptions) {
-        list.add(Component.literal(TreasureDisk.getTitle(stack)));
-    }
-
-    @ForgeOverride
-    public boolean doesSneakBypassUse(ItemStack stack, LevelReader world, BlockPos pos, Player player) {
-        return true;
-    }
-}

projects/common/src/main/java/dan200/computercraft/shared/media/items/TreasureDiskMedia.java

@@ -17,7 +17,7 @@ import org.jspecify.annotations.Nullable;
 import java.io.IOException;
 
 /**
- * An {@link IMedia} instance for {@linkplain TreasureDiskItem treasure disks}.
+ * An {@link IMedia} instance for {@linkplain ModRegistry.Items#TREASURE_DISK treasure disks}.
  */
 public final class TreasureDiskMedia implements IMedia {
     public static final IMedia INSTANCE = new TreasureDiskMedia();

projects/common/src/main/java/dan200/computercraft/shared/peripheral/diskdrive/DiskDriveBlock.java

@@ -7,13 +7,11 @@ package dan200.computercraft.shared.peripheral.diskdrive;
 import com.mojang.serialization.MapCodec;
 import dan200.computercraft.shared.ModRegistry;
 import dan200.computercraft.shared.common.HorizontalContainerBlock;
-import dan200.computercraft.shared.platform.PlatformHelper;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
-import net.minecraft.world.InteractionHand;
-import net.minecraft.world.ItemInteractionResult;
-import net.minecraft.world.entity.player.Player;
-import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.InteractionResult;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.context.UseOnContext;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.block.BaseEntityBlock;
 import net.minecraft.world.level.block.Block;
@@ -23,7 +21,6 @@ import net.minecraft.world.level.block.entity.BlockEntityType;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.block.state.StateDefinition;
 import net.minecraft.world.level.block.state.properties.EnumProperty;
-import net.minecraft.world.phys.BlockHitResult;
 import org.jspecify.annotations.Nullable;
 
 public class DiskDriveBlock extends HorizontalContainerBlock {
@@ -50,19 +47,24 @@ public class DiskDriveBlock extends HorizontalContainerBlock {
         return CODEC;
     }
 
-    @Override
-    protected ItemInteractionResult useItemOn(ItemStack stack, BlockState state, Level level, BlockPos pos, Player player, InteractionHand hand, BlockHitResult hit) {
-        if (player.isCrouching() && level.getBlockEntity(pos) instanceof DiskDriveBlockEntity drive) {
-            // Try to put a disk into the drive
-            if (stack.isEmpty()) return ItemInteractionResult.SKIP_DEFAULT_BLOCK_INTERACTION;
-
-            if (!level.isClientSide && drive.getDiskStack().isEmpty() && PlatformHelper.get().getMedia(stack) != null) {
-                drive.setDiskStack(stack.split(1));
+    /**
+     * A default implementation of {@link Item#useOn(UseOnContext)} for items that can be placed into a drive.
+     *
+     * @param context The context of this item usage action.
+     * @return Whether the item was placed or not.
+     */
+    public static InteractionResult defaultUseItemOn(UseOnContext context) {
+        var level = context.getLevel();
+        var blockPos = context.getClickedPos();
+        var blockState = level.getBlockState(blockPos);
+        if (blockState.is(ModRegistry.Blocks.DISK_DRIVE.get()) && blockState.getValue(STATE) == DiskDriveState.EMPTY) {
+            if (!level.isClientSide && level.getBlockEntity(blockPos) instanceof DiskDriveBlockEntity drive && drive.getDiskStack().isEmpty()) {
+                drive.setDiskStack(context.getItemInHand().split(1));
             }
-            return ItemInteractionResult.sidedSuccess(level.isClientSide);
+            return InteractionResult.sidedSuccess(level.isClientSide);
         }
 
-        return super.useItemOn(stack, state, level, pos, player, hand, hit);
+        return InteractionResult.PASS;
     }
 
     @Nullable

projects/common/src/main/java/dan200/computercraft/shared/peripheral/diskdrive/DiskDrivePeripheral.java

@@ -9,7 +9,7 @@ import dan200.computercraft.api.lua.LuaFunction;
 import dan200.computercraft.api.peripheral.IComputerAccess;
 import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.core.util.StringUtil;
-import dan200.computercraft.shared.media.items.DiskItem;
+import dan200.computercraft.shared.ModRegistry;
 import org.jspecify.annotations.Nullable;
 
 import java.util.Optional;
@@ -170,8 +170,8 @@ public class DiskDrivePeripheral implements IPeripheral {
      */
     @LuaFunction
     public final @Nullable Object @Nullable [] getDiskID() {
-        var disk = diskDrive.getMedia().stack();
-        return disk.getItem() instanceof DiskItem ? new Object[]{ DiskItem.getDiskID(disk) } : null;
+        var id = diskDrive.getMedia().stack().get(ModRegistry.DataComponents.DISK_ID.get());
+        return id != null ? new Object[]{ id.id() } : null;
     }
 
     @Override

projects/common/src/main/java/dan200/computercraft/shared/peripheral/generic/methods/AbstractFluidMethods.java

@@ -41,9 +41,9 @@ public abstract class AbstractFluidMethods<T> implements GenericPeripheral {
      * The returned table is sparse, and so empty tanks will be `nil` - it is recommended to loop over using [`pairs`]
      * rather than [`ipairs`].
      *
-     * @param fluids The current fluid handler.
+     * @param fluids The current fluid storage.
      * @return All tanks.
-     * @cc.treturn { (table|nil)... } All tanks in this fluid storage.
+     * @cc.treturn { (table|nil)... } Basic information about all fluids in this fluid storage.
      */
     @LuaFunction(mainThread = true)
     public abstract Map<Integer, Map<String, ?>> tanks(T fluids);

projects/common/src/main/java/dan200/computercraft/shared/peripheral/generic/methods/AbstractInventoryMethods.java

@@ -56,8 +56,8 @@ public abstract class AbstractInventoryMethods<T> implements GenericPeripheral {
      * rather than [`ipairs`].
      *
      * @param inventory The current inventory.
-     * @return All items in this inventory.
-     * @cc.treturn { (table|nil)... } All items in this inventory.
+     * @return Basic information about all items in this inventory.
+     * @cc.treturn { (table|nil)... } Basic information about all items in this inventory.
      * @cc.usage Find an adjacent chest and print all items in it.
      *
      * <pre>{@code
@@ -86,9 +86,8 @@ public abstract class AbstractInventoryMethods<T> implements GenericPeripheral {
      *
      * @param inventory The current inventory.
      * @param slot      The slot to get information about.
-     * @return Information about the item in this slot, or {@code nil} if not present.
+     * @return Information about the item in this slot, or {@code nil} if it is empty.
      * @throws LuaException If the slot is out of range.
-     * @cc.treturn table Information about the item in this slot, or {@code nil} if not present.
      * @cc.usage Print some information about the first in a chest.
      *
      * <pre>{@code
@@ -106,7 +105,7 @@ public abstract class AbstractInventoryMethods<T> implements GenericPeripheral {
      */
     @Nullable
     @LuaFunction(mainThread = true)
-    public abstract Map<String, ?> getItemDetail(T inventory, int slot) throws LuaException;
+    public abstract Map<?, ?> getItemDetail(T inventory, int slot) throws LuaException;
 
     /**
      * Get the maximum number of items which can be stored in this slot.

projects/common/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/CableBlock.java

@@ -252,11 +252,6 @@ public class CableBlock extends Block implements SimpleWaterloggedBlock, EntityB
         if (world.getBlockEntity(pos) instanceof CableBlockEntity modem) modem.neighborChanged(neighbourPos);
     }
 
-    @ForgeOverride
-    public final void onNeighborChange(BlockState state, LevelReader world, BlockPos pos, BlockPos neighbour) {
-        if (world.getBlockEntity(pos) instanceof CableBlockEntity modem) modem.neighborChanged(neighbour);
-    }
-
     @Override
     protected void tick(BlockState state, ServerLevel world, BlockPos pos, RandomSource rand) {
         if (world.getBlockEntity(pos) instanceof CableBlockEntity modem) modem.blockTick();

projects/common/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/WiredModemFullBlock.java

@@ -4,7 +4,6 @@
 
 package dan200.computercraft.shared.peripheral.modem.wired;
 
-import dan200.computercraft.annotations.ForgeOverride;
 import dan200.computercraft.shared.ModRegistry;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
@@ -14,7 +13,6 @@ import net.minecraft.world.InteractionResult;
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.LevelAccessor;
-import net.minecraft.world.level.LevelReader;
 import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.EntityBlock;
 import net.minecraft.world.level.block.entity.BlockEntity;
@@ -62,13 +60,6 @@ public class WiredModemFullBlock extends Block implements EntityBlock {
         }
     }
 
-    @ForgeOverride
-    public final void onNeighborChange(BlockState state, LevelReader level, BlockPos pos, BlockPos neighbour) {
-        if (state.getValue(PERIPHERAL_ON) && level.getBlockEntity(pos) instanceof WiredModemFullBlockEntity modem) {
-            modem.neighborChanged(neighbour);
-        }
-    }
-
     @Override
     protected void tick(BlockState state, ServerLevel world, BlockPos pos, RandomSource rand) {
         if (world.getBlockEntity(pos) instanceof WiredModemFullBlockEntity modem) modem.blockTick();

projects/common/src/main/java/dan200/computercraft/shared/peripheral/modem/wireless/WirelessModemBlockEntity.java

@@ -39,7 +39,7 @@ public class WirelessModemBlockEntity extends BlockEntity {
 
         @Override
         public boolean equals(@Nullable IPeripheral other) {
-            return this == other || (other instanceof Peripheral && entity == ((Peripheral) other).entity);
+            return this == other || (other instanceof Peripheral o && entity == o.entity);
         }
 
         @Override

projects/common/src/main/java/dan200/computercraft/shared/peripheral/monitor/MonitorPeripheral.java

@@ -40,7 +40,6 @@ import org.jspecify.annotations.Nullable;
  * monitor.setCursorPos(1, 1)
  * monitor.write("Hello, world!")
  * }</pre>
- *
  * @cc.see monitor_resize Queued when a monitor is resized.
  * @cc.see monitor_touch Queued when an advanced monitor is clicked.
  */
@@ -95,7 +94,7 @@ public class MonitorPeripheral extends TermMethods implements IPeripheral {
 
     @Override
     public boolean equals(@Nullable IPeripheral other) {
-        return other instanceof MonitorPeripheral && monitor == ((MonitorPeripheral) other).monitor;
+        return other instanceof MonitorPeripheral o && monitor == o.monitor;
     }
 
     private ServerMonitor getMonitor() throws LuaException {

projects/common/src/main/java/dan200/computercraft/shared/peripheral/monitor/MonitorWatcher.java

@@ -58,11 +58,10 @@ public final class MonitorWatcher {
             if (monitor == null) continue;
 
             var pos = tile.getBlockPos();
-            var world = tile.getLevel();
-            if (!(world instanceof ServerLevel)) continue;
+            if (!(tile.getLevel() instanceof ServerLevel level)) continue;
 
-            var chunk = world.getChunkAt(pos);
-            if (((ServerLevel) world).getChunkSource().chunkMap.getPlayers(chunk.getPos(), false).isEmpty()) {
+            var chunk = level.getChunkAt(pos);
+            if (level.getChunkSource().chunkMap.getPlayers(chunk.getPos(), false).isEmpty()) {
                 continue;
             }
 

projects/common/src/main/java/dan200/computercraft/shared/peripheral/printer/PrinterBlockEntity.java

@@ -170,8 +170,7 @@ public final class PrinterBlockEntity extends AbstractContainerBlockEntity imple
     }
 
     static boolean isPaper(ItemStack stack) {
-        var item = stack.getItem();
-        return item == Items.PAPER || item == ModRegistry.Items.PRINTED_PAGE.get();
+        return stack.is(Items.PAPER) || stack.is(ModRegistry.Items.PRINTED_PAGE.get());
     }
 
     private boolean canInputPage() {

projects/common/src/main/java/dan200/computercraft/shared/peripheral/speaker/SpeakerBlockEntity.java

@@ -9,6 +9,7 @@ import dan200.computercraft.core.util.Nullability;
 import dan200.computercraft.shared.network.client.SpeakerStopClientMessage;
 import dan200.computercraft.shared.network.server.ServerNetworking;
 import net.minecraft.core.BlockPos;
+import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.entity.BlockEntityType;
 import net.minecraft.world.level.block.state.BlockState;
@@ -47,13 +48,18 @@ public class SpeakerBlockEntity extends BlockEntity {
         }
 
         @Override
-        public SpeakerPosition getPosition() {
+        protected ServerLevel getLevel() {
+            return (ServerLevel) speaker.getLevel();
+        }
+
+        @Override
+        protected SpeakerPosition getPosition() {
             return SpeakerPosition.of(speaker.getLevel(), Vec3.atCenterOf(speaker.getBlockPos()));
         }
 
         @Override
         public boolean equals(@Nullable IPeripheral other) {
-            return this == other || (other instanceof Peripheral && speaker == ((Peripheral) other).speaker);
+            return this == other || (other instanceof Peripheral o && speaker == o.speaker);
         }
     }
 }

projects/common/src/main/java/dan200/computercraft/shared/peripheral/speaker/SpeakerPeripheral.java

@@ -32,7 +32,10 @@ import net.minecraft.util.Mth;
 import net.minecraft.world.level.block.state.properties.NoteBlockInstrument;
 import org.jspecify.annotations.Nullable;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
 
 import static dan200.computercraft.api.lua.LuaValues.checkFinite;
 
@@ -155,7 +158,9 @@ public abstract class SpeakerPeripheral implements IPeripheral {
         }
     }
 
-    public abstract SpeakerPosition getPosition();
+    protected abstract ServerLevel getLevel();
+
+    protected abstract SpeakerPosition getPosition();
 
     public UUID getSource() {
         return source;
@@ -255,8 +260,8 @@ public abstract class SpeakerPeripheral implements IPeripheral {
         // Prevent playing music discs.
         var soundEvent = BuiltInRegistries.SOUND_EVENT.get(identifier);
         // TODO: Build a set of sound events at server startup, and cache this.
-        var level = Objects.requireNonNull(getPosition().level());
-        if (soundEvent != null && level.registryAccess().registry(Registries.JUKEBOX_SONG).orElseThrow().stream().anyMatch(x -> x.soundEvent().value() == soundEvent)) {
+        var level = getLevel();
+        if (soundEvent != null && level.registryAccess().registryOrThrow(Registries.JUKEBOX_SONG).stream().anyMatch(x -> x.soundEvent().value() == soundEvent)) {
             return false;
         }
 

projects/common/src/main/java/dan200/computercraft/shared/peripheral/speaker/UpgradeSpeakerPeripheral.java

@@ -20,10 +20,8 @@ public abstract class UpgradeSpeakerPeripheral extends SpeakerPeripheral {
         super.detach(computer);
 
         // We could be in the process of shutting down the server, so we can't send packets in this case.
-        var level = getPosition().level();
-        if (level == null) return;
-        var server = level.getServer();
-        if (server == null || server.isStopped()) return;
+        var server = getLevel().getServer();
+        if (server.isStopped()) return;
 
         ServerNetworking.sendToAllPlayers(new SpeakerStopClientMessage(getSource()), server);
     }

projects/common/src/main/java/dan200/computercraft/shared/pocket/core/PocketBrain.java

@@ -41,11 +41,12 @@ public final class PocketBrain implements IPocketAccess {
     private int colour = -1;
     private int lightColour = -1;
 
-    public PocketBrain(PocketHolder holder, @Nullable UpgradeData<IPocketUpgrade> upgrade, ServerComputer.Properties properties) {
+    public PocketBrain(PocketHolder holder, @Nullable UpgradeData<IPocketUpgrade> upgrade, int colour, ServerComputer.Properties properties) {
         this.computer = new PocketServerComputer(this, holder, properties);
         this.holder = holder;
         this.position = holder.pos();
         this.upgrade = upgrade;
+        this.colour = colour;
         invalidatePeripheral();
     }
 

projects/common/src/main/java/dan200/computercraft/shared/pocket/core/PocketServerComputer.java

@@ -7,7 +7,6 @@ package dan200.computercraft.shared.pocket.core;
 import dan200.computercraft.api.component.ComputerComponents;
 import dan200.computercraft.shared.computer.core.ComputerState;
 import dan200.computercraft.shared.computer.core.ServerComputer;
-import dan200.computercraft.shared.config.ConfigSpec;
 import dan200.computercraft.shared.network.client.PocketComputerDataMessage;
 import dan200.computercraft.shared.network.client.PocketComputerDeletedClientMessage;
 import dan200.computercraft.shared.network.server.ServerNetworking;
@@ -40,10 +39,7 @@ public final class PocketServerComputer extends ServerComputer {
     private Set<ServerPlayer> tracking = Set.of();
 
     PocketServerComputer(PocketBrain brain, PocketHolder holder, ServerComputer.Properties properties) {
-        super(holder.level(), holder.blockPos(), properties
-            .terminalSize(ConfigSpec.pocketTermWidth.get(), ConfigSpec.pocketTermHeight.get())
-            .addComponent(ComputerComponents.POCKET, brain)
-        );
+        super(holder.level(), holder.blockPos(), properties.addComponent(ComputerComponents.POCKET, brain));
         this.brain = brain;
     }
 

projects/common/src/main/java/dan200/computercraft/shared/pocket/items/PocketComputerItem.java

@@ -11,19 +11,16 @@ import dan200.computercraft.api.upgrades.UpgradeData;
 import dan200.computercraft.core.computer.ComputerSide;
 import dan200.computercraft.impl.PocketUpgrades;
 import dan200.computercraft.shared.ModRegistry;
-import dan200.computercraft.shared.computer.core.ComputerFamily;
-import dan200.computercraft.shared.computer.core.ServerComputer;
-import dan200.computercraft.shared.computer.core.ServerComputerRegistry;
-import dan200.computercraft.shared.computer.core.ServerContext;
+import dan200.computercraft.shared.computer.core.*;
 import dan200.computercraft.shared.computer.inventory.ComputerMenuWithoutInventory;
 import dan200.computercraft.shared.computer.items.ServerComputerReference;
+import dan200.computercraft.shared.config.ConfigSpec;
 import dan200.computercraft.shared.network.container.ComputerContainerData;
 import dan200.computercraft.shared.platform.PlatformHelper;
 import dan200.computercraft.shared.pocket.core.PocketBrain;
 import dan200.computercraft.shared.pocket.core.PocketHolder;
 import dan200.computercraft.shared.pocket.core.PocketServerComputer;
 import dan200.computercraft.shared.util.*;
-import net.minecraft.ChatFormatting;
 import net.minecraft.network.chat.Component;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.level.ServerLevel;
@@ -36,11 +33,10 @@ import net.minecraft.world.entity.item.ItemEntity;
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.ItemStack;
-import net.minecraft.world.item.TooltipFlag;
+import net.minecraft.world.item.component.DyedItemColor;
 import net.minecraft.world.level.Level;
 import org.jspecify.annotations.Nullable;
 
-import java.util.List;
 import java.util.Objects;
 
 public class PocketComputerItem extends Item {
@@ -184,18 +180,6 @@ public class PocketComputerItem extends Item {
         }
     }
 
-
-    @Override
-    public void appendHoverText(ItemStack stack, TooltipContext context, List<Component> list, TooltipFlag flag) {
-        if (flag.isAdvanced() || getLabel(stack) == null) {
-            var id = stack.get(ModRegistry.DataComponents.COMPUTER_ID.get());
-            if (id != null) {
-                list.add(Component.translatable("gui.computercraft.tooltip.computer_id", id.id())
-                    .withStyle(ChatFormatting.GRAY));
-            }
-        }
-    }
-
     @Nullable
     @ForgeOverride
     public String getCreatorModId(ItemStack stack) {
@@ -217,10 +201,14 @@ public class PocketComputerItem extends Item {
 
         var computerID = NonNegativeId.getOrCreate(level.getServer(), stack, ModRegistry.DataComponents.COMPUTER_ID.get(), IDAssigner.COMPUTER);
         var brain = new PocketBrain(
-            holder, getUpgradeWithData(stack),
+            holder, getUpgradeWithData(stack), DyedItemColor.getOrDefault(stack, -1),
             ServerComputer.properties(computerID, getFamily())
                 .label(getLabel(stack))
                 .storageCapacity(StorageCapacity.getOrDefault(stack.get(ModRegistry.DataComponents.STORAGE_CAPACITY.get()), -1))
+                .terminalSize(stack.getOrDefault(
+                    ModRegistry.DataComponents.TERMINAL_SIZE.get(),
+                    new TerminalSize(ConfigSpec.pocketTermWidth.get(), ConfigSpec.pocketTermHeight.get())
+                ))
         );
         var computer = brain.computer();
 
@@ -256,10 +244,14 @@ public class PocketComputerItem extends Item {
         // item. However, if we've just crafted the computer with an upgrade, we should sync the other way, and update
         // the computer.
         var server = level.getServer();
-        if (server != null) {
-            var computer = getServerComputer(server, stack);
-            if (computer != null) computer.getBrain().setUpgrade(getUpgradeWithData(stack));
-        }
+        if (server == null) return;
+
+        var computer = getServerComputer(server, stack);
+        if (computer == null) return;
+
+        var brain = computer.getBrain();
+        brain.setUpgrade(getUpgradeWithData(stack));
+        brain.setColour(DyedItemColor.getOrDefault(stack, -1));
     }
 
     public ComputerFamily getFamily() {

projects/common/src/main/java/dan200/computercraft/shared/pocket/peripherals/PocketSpeaker.java

@@ -26,8 +26,7 @@ public class PocketSpeaker extends AbstractPocketUpgrade {
 
     @Override
     public void update(IPocketAccess access, @Nullable IPeripheral peripheral) {
-        if (!(peripheral instanceof PocketSpeakerPeripheral)) return;
-        ((PocketSpeakerPeripheral) peripheral).update();
+        if (peripheral instanceof PocketSpeakerPeripheral speaker) speaker.update();
     }
 
     @Override

projects/common/src/main/java/dan200/computercraft/shared/pocket/peripherals/PocketSpeakerPeripheral.java

@@ -8,17 +8,23 @@ import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.api.pocket.IPocketAccess;
 import dan200.computercraft.shared.peripheral.speaker.SpeakerPosition;
 import dan200.computercraft.shared.peripheral.speaker.UpgradeSpeakerPeripheral;
+import net.minecraft.server.level.ServerLevel;
 import org.jspecify.annotations.Nullable;
 
-public class PocketSpeakerPeripheral extends UpgradeSpeakerPeripheral {
+final class PocketSpeakerPeripheral extends UpgradeSpeakerPeripheral {
     private final IPocketAccess access;
 
-    public PocketSpeakerPeripheral(IPocketAccess access) {
+    PocketSpeakerPeripheral(IPocketAccess access) {
         this.access = access;
     }
 
     @Override
-    public SpeakerPosition getPosition() {
+    protected ServerLevel getLevel() {
+        return access.getLevel();
+    }
+
+    @Override
+    protected SpeakerPosition getPosition() {
         var entity = access.getEntity();
         return entity == null ? SpeakerPosition.of(access.getLevel(), access.getPosition()) : SpeakerPosition.of(entity);
     }

projects/common/src/main/java/dan200/computercraft/shared/recipe/function/CopyComponents.java

@@ -17,8 +17,8 @@ import net.minecraft.world.item.crafting.CraftingInput;
 import net.minecraft.world.item.crafting.Ingredient;
 import net.minecraft.world.level.ItemLike;
 import net.minecraft.world.level.storage.loot.functions.CopyComponentsFunction;
+import org.jspecify.annotations.Nullable;
 
-import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;

projects/common/src/main/java/dan200/computercraft/shared/turtle/apis/TurtleAPI.java

@@ -13,7 +13,9 @@ import dan200.computercraft.core.metrics.Metrics;
 import dan200.computercraft.core.metrics.MetricsObserver;
 import dan200.computercraft.shared.peripheral.generic.methods.AbstractInventoryMethods;
 import dan200.computercraft.shared.turtle.core.*;
+import org.jspecify.annotations.Nullable;
 
+import java.util.Map;
 import java.util.Optional;
 
 /**
@@ -659,6 +661,7 @@ public class TurtleAPI implements ILuaAPI {
      * @cc.treturn [2] string The reason equipping this item failed.
      * @cc.since 1.6
      * @see #equipRight()
+     * @see #getEquippedLeft()
      */
     @LuaFunction
     public final MethodResult equipLeft() {
@@ -678,12 +681,45 @@ public class TurtleAPI implements ILuaAPI {
      * @cc.treturn [2] string The reason equipping this item failed.
      * @cc.since 1.6
      * @see #equipLeft()
+     * @see #getEquippedRight()
      */
     @LuaFunction
     public final MethodResult equipRight() {
         return trackCommand(new TurtleEquipCommand(TurtleSide.RIGHT));
     }
 
+    /**
+     * Get the upgrade currently equipped on the left of the turtle.
+     * <p>
+     * This returns information about the currently equipped item, in the same form as
+     * {@link #getItemDetail(ILuaContext, Optional, Optional)}.
+     *
+     * @return Information about the currently equipped item, or {@code nil} if no upgrade is equipped.
+     * @see #equipLeft()
+     * @cc.since 1.116.0
+     */
+    @LuaFunction(mainThread = true)
+    public final @Nullable Map<?, ?> getEquippedLeft() {
+        var upgrade = turtle.getUpgradeWithData(TurtleSide.LEFT);
+        return upgrade == null ? null : VanillaDetailRegistries.ITEM_STACK.getDetails(upgrade.getUpgradeItem());
+    }
+
+    /**
+     * Get the upgrade currently equipped on the right of the turtle.
+     * <p>
+     * This returns information about the currently equipped item, in the same form as
+     * {@link #getItemDetail(ILuaContext, Optional, Optional)}.
+     *
+     * @return Information about the currently equipped item, or {@code nil} if no upgrade is equipped.
+     * @see #equipRight()
+     * @cc.since 1.116.0
+     */
+    @LuaFunction(mainThread = true)
+    public final @Nullable Map<?, ?> getEquippedRight() {
+        var upgrade = turtle.getUpgradeWithData(TurtleSide.RIGHT);
+        return upgrade == null ? null : VanillaDetailRegistries.ITEM_STACK.getDetails(upgrade.getUpgradeItem());
+    }
+
     /**
      * Get information about the block in front of the turtle.
      *
@@ -745,7 +781,7 @@ public class TurtleAPI implements ILuaAPI {
      *                 more information about the item at the cost of taking longer to run.
      * @return The command result.
      * @throws LuaException If the slot is out of range.
-     * @cc.treturn nil|table Information about the given slot, or {@code nil} if it is empty.
+     * @cc.treturn nil|table Information about the item in this slot, or {@code nil} if it is empty.
      * @cc.since 1.64
      * @cc.changed 1.90.0 Added detailed parameter.
      * @cc.usage Print the current slot, assuming it contains 13 dirt.

projects/common/src/main/java/dan200/computercraft/shared/turtle/blocks/TurtleBlockEntity.java

@@ -18,6 +18,7 @@ import dan200.computercraft.shared.computer.blocks.ComputerPeripheral;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.computer.core.ComputerState;
 import dan200.computercraft.shared.computer.core.ServerComputer;
+import dan200.computercraft.shared.computer.core.TerminalSize;
 import dan200.computercraft.shared.config.Config;
 import dan200.computercraft.shared.container.BasicContainer;
 import dan200.computercraft.shared.platform.PlatformHelper;
@@ -81,7 +82,7 @@ public class TurtleBlockEntity extends AbstractComputerBlockEntity implements Ba
     protected ServerComputer createComputer(int id) {
         var computer = new ServerComputer((ServerLevel) getLevel(), getBlockPos(), ServerComputer.properties(id, getFamily())
             .label(getLabel())
-            .terminalSize(Config.TURTLE_TERM_WIDTH, Config.TURTLE_TERM_HEIGHT)
+            .terminalSize(new TerminalSize(Config.TURTLE_TERM_WIDTH, Config.TURTLE_TERM_HEIGHT))
             .storageCapacity(storageCapacity)
             .addComponent(ComputerComponents.TURTLE, brain)
         );
@@ -169,8 +170,8 @@ public class TurtleBlockEntity extends AbstractComputerBlockEntity implements Ba
     }
 
     @Override
-    protected void collectImplicitComponents(DataComponentMap.Builder builder) {
-        super.collectImplicitComponents(builder);
+    protected void collectSafeComponents(DataComponentMap.Builder builder) {
+        super.collectSafeComponents(builder);
 
         builder.set(DataComponents.DYED_COLOR, brain.getColour() == -1 ? null : new DyedItemColor(brain.getColour(), false));
         builder.set(ModRegistry.DataComponents.OVERLAY.get(), brain.getOverlay());

projects/common/src/main/java/dan200/computercraft/shared/turtle/core/TurtleDropCommand.java

@@ -62,14 +62,13 @@ public class TurtleDropCommand implements TurtleCommand {
             }
         }
 
-        switch (transferred) {
-            case ContainerTransfer.NO_SPACE:
-                return TurtleCommandResult.failure("No space for items");
-            case ContainerTransfer.NO_ITEMS:
-                return TurtleCommandResult.failure("No items to drop");
-            default:
+        return switch (transferred) {
+            case ContainerTransfer.NO_SPACE -> TurtleCommandResult.failure("No space for items");
+            case ContainerTransfer.NO_ITEMS -> TurtleCommandResult.failure("No items to drop");
+            default -> {
                 turtle.playAnimation(TurtleAnimation.WAIT);
-                return TurtleCommandResult.success();
-        }
+                yield TurtleCommandResult.success();
+            }
+        };
     }
 }

projects/common/src/main/java/dan200/computercraft/shared/turtle/core/TurtleSuckCommand.java

@@ -50,15 +50,14 @@ public class TurtleSuckCommand implements TurtleCommand {
         if (inventory != null) {
             // Take from inventory of thing in front
             var transferred = inventory.moveTo(TurtleUtil.getOffsetInventory(turtle), quantity);
-            switch (transferred) {
-                case ContainerTransfer.NO_SPACE:
-                    return TurtleCommandResult.failure("No space for items");
-                case ContainerTransfer.NO_ITEMS:
-                    return TurtleCommandResult.failure("No items to take");
-                default:
+            return switch (transferred) {
+                case ContainerTransfer.NO_SPACE -> TurtleCommandResult.failure("No space for items");
+                case ContainerTransfer.NO_ITEMS -> TurtleCommandResult.failure("No items to take");
+                default -> {
                     turtle.playAnimation(TurtleAnimation.WAIT);
-                    return TurtleCommandResult.success();
-            }
+                    yield TurtleCommandResult.success();
+                }
+            };
         } else {
             // Suck up loose items off the ground
             var aabb = new AABB(

projects/common/src/main/java/dan200/computercraft/shared/turtle/items/TurtleItem.java

@@ -11,18 +11,18 @@ import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.api.upgrades.UpgradeData;
 import dan200.computercraft.impl.TurtleUpgrades;
 import dan200.computercraft.shared.ModRegistry;
-import dan200.computercraft.shared.computer.items.ComputerItem;
 import dan200.computercraft.shared.turtle.TurtleOverlay;
 import dan200.computercraft.shared.turtle.blocks.TurtleBlock;
 import net.minecraft.core.cauldron.CauldronInteraction;
 import net.minecraft.core.component.DataComponents;
 import net.minecraft.network.chat.Component;
 import net.minecraft.world.ItemInteractionResult;
+import net.minecraft.world.item.BlockItem;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.level.block.LayeredCauldronBlock;
 import org.jspecify.annotations.Nullable;
 
-public class TurtleItem extends ComputerItem {
+public class TurtleItem extends BlockItem {
     public TurtleItem(TurtleBlock block, Properties settings) {
         super(block, settings);
     }

projects/common/src/main/java/dan200/computercraft/shared/turtle/recipes/TurtleUpgradeRecipe.java

@@ -109,7 +109,9 @@ public final class TurtleUpgradeRecipe extends CustomRecipe {
             TurtleItem.getUpgradeWithData(turtle, TurtleSide.RIGHT),
         };
 
-        // Get the upgrades for the new items
+        // Get the upgrades for the new items.
+        // Note: because the turtle is facing towards us, the directions are flipped. Items placed to the left
+        // of the turtle, are equipped on its right (and vice versa).
         var items = new ItemStack[]{ rightItem, leftItem };
         for (var i = 0; i < 2; i++) {
             if (!items[i].isEmpty()) {

projects/common/src/main/java/dan200/computercraft/shared/turtle/upgrades/TurtleSpeaker.java

@@ -13,6 +13,7 @@ import dan200.computercraft.api.upgrades.UpgradeType;
 import dan200.computercraft.shared.ModRegistry;
 import dan200.computercraft.shared.peripheral.speaker.SpeakerPosition;
 import dan200.computercraft.shared.peripheral.speaker.UpgradeSpeakerPeripheral;
+import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.phys.Vec3;
 import org.jspecify.annotations.Nullable;
@@ -26,7 +27,12 @@ public class TurtleSpeaker extends AbstractTurtleUpgrade {
         }
 
         @Override
-        public SpeakerPosition getPosition() {
+        protected ServerLevel getLevel() {
+            return (ServerLevel) turtle.getLevel();
+        }
+
+        @Override
+        protected SpeakerPosition getPosition() {
             return SpeakerPosition.of(turtle.getLevel(), Vec3.atCenterOf(turtle.getPosition()));
         }
 

projects/common/src/main/java/dan200/computercraft/shared/turtle/upgrades/TurtleTool.java

@@ -256,8 +256,8 @@ public class TurtleTool extends AbstractTurtleUpgrade {
         EnchantmentHelper.doPostAttackEffects(player.serverLevel(), entity, source);
 
         // Damage the original item stack.
-        if (!tool.isEmpty() && entity instanceof LivingEntity && didHurt) {
-            tool.postHurtEnemy((LivingEntity) entity, player);
+        if (!tool.isEmpty() && entity instanceof LivingEntity living && didHurt) {
+            tool.postHurtEnemy(living, player);
         }
 
         return true;

projects/common/src/main/java/dan200/computercraft/shared/util/DropConsumer.java

@@ -70,9 +70,9 @@ public final class DropConsumer {
 
     public static boolean onEntitySpawn(Entity entity) {
         // Capture any nearby item spawns
-        if (dropWorld == entity.level() && entity instanceof ItemEntity
+        if (dropWorld == entity.level() && entity instanceof ItemEntity item
             && assertNonNull(dropBounds).contains(entity.position())) {
-            handleDrops(((ItemEntity) entity).getItem());
+            handleDrops(item.getItem());
             return true;
         }
 

projects/common/src/main/java/dan200/computercraft/shared/util/NonNegativeId.java

@@ -7,7 +7,9 @@ package dan200.computercraft.shared.util;
 import com.mojang.serialization.Codec;
 import dan200.computercraft.api.ComputerCraftAPI;
 import io.netty.buffer.ByteBuf;
+import net.minecraft.ChatFormatting;
 import net.minecraft.core.component.DataComponentType;
+import net.minecraft.network.chat.Component;
 import net.minecraft.network.codec.ByteBufCodecs;
 import net.minecraft.network.codec.StreamCodec;
 import net.minecraft.server.MinecraftServer;
@@ -15,6 +17,8 @@ import net.minecraft.util.ExtraCodecs;
 import net.minecraft.world.item.ItemStack;
 import org.jspecify.annotations.Nullable;
 
+import java.util.function.Consumer;
+
 /**
  * A non-negative integer id, used for computer and disk ids.
  *
@@ -47,4 +51,8 @@ public record NonNegativeId(int id) {
         stack.set(component, new NonNegativeId(diskID));
         return diskID;
     }
+
+    public void addToTooltip(String translation, Consumer<Component> out) {
+        out.accept(Component.translatable(translation, id()).withStyle(ChatFormatting.GRAY));
+    }
 }

projects/common/src/main/java/dan200/computercraft/shared/util/PrettyJsonWriter.java

@@ -79,8 +79,8 @@ public class PrettyJsonWriter extends JsonWriter {
 
         // Otherwise we either need to push to our list or finish a record pair.
         var head = stack.getLast();
-        if (head instanceof DocList) {
-            ((DocList) head).add(object);
+        if (head instanceof DocList headList) {
+            headList.add(object);
         } else {
             stack.removeLast();
             ((DocList) stack.getLast()).add(new Pair((String) head, object));