Minor fixes and cleanup

My working tree is a mess, so this is not a good commit. I'm making a
bit of a habit of this.

 - Fix UserLevel.OWNER check failing on single player servers.
 - Correctly handle the "open folder" fake command.
 - Some reshuffling of Forge-specific methods to make Fabric slightly
   easier.

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

@@ -16,25 +16,33 @@ import dan200.computercraft.client.render.monitor.MonitorHighlightRenderer;
 import dan200.computercraft.client.render.monitor.MonitorRenderState;
 import dan200.computercraft.client.sound.SpeakerManager;
 import dan200.computercraft.shared.CommonHooks;
+import dan200.computercraft.shared.ModRegistry;
 import dan200.computercraft.shared.command.CommandComputerCraft;
 import dan200.computercraft.shared.computer.core.ServerContext;
 import dan200.computercraft.shared.media.items.PrintoutItem;
+import dan200.computercraft.shared.peripheral.modem.wired.CableBlock;
+import dan200.computercraft.shared.peripheral.modem.wired.CableModemVariant;
+import dan200.computercraft.shared.peripheral.modem.wired.CableShapes;
 import dan200.computercraft.shared.peripheral.monitor.MonitorBlockEntity;
 import dan200.computercraft.shared.pocket.items.PocketComputerItem;
 import dan200.computercraft.shared.turtle.blocks.TurtleBlockEntity;
 import dan200.computercraft.shared.util.PauseAwareTimer;
+import dan200.computercraft.shared.util.WorldUtil;
 import net.minecraft.Util;
 import net.minecraft.client.Camera;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.client.sounds.AudioStream;
 import net.minecraft.client.sounds.SoundEngine;
+import net.minecraft.core.BlockPos;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.entity.decoration.ItemFrame;
 import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.phys.BlockHitResult;
 import net.minecraft.world.phys.HitResult;
 
+import javax.annotation.Nullable;
 import java.io.File;
 import java.util.function.Consumer;
 
@@ -159,4 +167,24 @@ public final class ClientHooks {
         var upgrade = turtle.getUpgrade(side);
         if (upgrade != null) out.accept(String.format("Upgrade[%s]: %s", side, upgrade.getUpgradeID()));
     }
+
+    public static @Nullable BlockState getBlockBreakingState(BlockState state, BlockPos pos) {
+        // Only apply to cables which have both a cable and modem
+        if (state.getBlock() != ModRegistry.Blocks.CABLE.get()
+            || !state.getValue(CableBlock.CABLE)
+            || state.getValue(CableBlock.MODEM) == CableModemVariant.None
+        ) {
+            return null;
+        }
+
+        var hit = Minecraft.getInstance().hitResult;
+        if (hit == null || hit.getType() != HitResult.Type.BLOCK) return null;
+        var hitPos = ((BlockHitResult) hit).getBlockPos();
+
+        if (!hitPos.equals(pos)) return null;
+
+        return WorldUtil.isVecInside(CableShapes.getModemShape(state), hit.getLocation().subtract(pos.getX(), pos.getY(), pos.getZ()))
+            ? state.getBlock().defaultBlockState().setValue(CableBlock.MODEM, state.getValue(CableBlock.MODEM))
+            : state.setValue(CableBlock.MODEM, CableModemVariant.None);
+    }
 }

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

@@ -20,7 +20,7 @@ import dan200.computercraft.shared.common.IColouredItem;
 import dan200.computercraft.shared.computer.inventory.AbstractComputerMenu;
 import dan200.computercraft.shared.computer.inventory.ViewComputerMenu;
 import dan200.computercraft.shared.media.items.DiskItem;
-import dan200.computercraft.shared.media.items.ItemTreasureDisk;
+import dan200.computercraft.shared.media.items.TreasureDiskItem;
 import net.minecraft.client.color.item.ItemColor;
 import net.minecraft.client.gui.screens.MenuScreens;
 import net.minecraft.client.multiplayer.ClientLevel;
@@ -137,7 +137,7 @@ public final class ClientRegistry {
         );
 
         register.accept(
-            (stack, layer) -> layer == 1 ? ItemTreasureDisk.getColour(stack) : 0xFFFFFF,
+            (stack, layer) -> layer == 1 ? TreasureDiskItem.getColour(stack) : 0xFFFFFF,
             ModRegistry.Items.TREASURE_DISK.get()
         );
 

projects/common/src/client/java/dan200/computercraft/mixin/client/LocalPlayerMixin.java

@@ -0,0 +1,21 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2022. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.mixin.client;
+
+import dan200.computercraft.client.ClientHooks;
+import net.minecraft.client.player.LocalPlayer;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(LocalPlayer.class)
+class LocalPlayerMixin {
+    @Inject(method = "commandUnsigned", at = @At("HEAD"), cancellable = true)
+    void commandUnsigned(String message, CallbackInfoReturnable<Boolean> ci) {
+        if (ClientHooks.onChatMessage(message)) ci.setReturnValue(true);
+    }
+}

projects/common/src/client/resources/computercraft-client.mixins.json

@@ -0,0 +1,13 @@
+{
+    "required": true,
+    "package": "dan200.computercraft.mixin.client",
+    "minVersion": "0.8",
+    "compatibilityLevel": "JAVA_17",
+    "injectors": {
+        "defaultRequire": 1
+    },
+    "client": [
+        "LocalPlayerMixin"
+    ],
+    "refmap": "client-computercraft.refmap.json"
+}