Add MoreRed support

I've written three or four integrations with bundled cables now over the
various versions, and I'm still not convinced this one is right. It
appears to work though, so we'll see.

We need depend on the main jar here (rather than the API jar), as
otherwise our javadoc tools fails - the API references some internal
classes which aren't on our classpath.

It might be nice to write tests for this (and CT) in the future -
goodness knows these features are fragile - but that'll require some
more gradle work which I don't want to do right now.

Closes #772

build.gradle

@@ -53,6 +53,9 @@ minecraft {
             property 'forge.logging.markers', 'REGISTRIES'
             property 'forge.logging.console.level', 'debug'
 
+            property 'mixin.env.remapRefMap', 'true'
+            property 'mixin.env.refMapRemappingFile', "${buildDir}/createSrgToMcp/output.srg"
+
             mods {
                 computercraft {
                     source sourceSets.main
@@ -138,6 +141,7 @@ dependencies {
 
     compileOnly fg.deobf("mezz.jei:jei-1.16.5:7.7.0.104:api")
     compileOnly fg.deobf("com.blamejared.crafttweaker:CraftTweaker-1.16.5:7.1.0.313")
+    compileOnly fg.deobf("commoble.morered:morered-1.16.5:2.1.1.0")
 
     runtimeOnly fg.deobf("mezz.jei:jei-1.16.5:7.7.0.104")
 
@@ -233,6 +237,9 @@ processResources {
 
 // Web tasks
 
+
+import com.hierynomus.gradle.license.tasks.LicenseCheck
+import com.hierynomus.gradle.license.tasks.LicenseFormat
 import org.apache.tools.ant.taskdefs.condition.Os
 
 List<String> mkCommand(String command) {
@@ -302,10 +309,6 @@ jacocoTestReport {
 
 check.dependsOn jacocoTestReport
 
-
-import com.hierynomus.gradle.license.tasks.LicenseCheck
-import com.hierynomus.gradle.license.tasks.LicenseFormat
-
 license {
     mapping("java", "SLASHSTAR_STYLE")
     strictCheck true
@@ -335,8 +338,8 @@ gradle.projectsEvaluated {
 }
 
 
-task licenseAPI(type: LicenseCheck);
+task licenseAPI(type: LicenseCheck)
-task licenseFormatAPI(type: LicenseFormat);
+task licenseFormatAPI(type: LicenseFormat)
 [licenseAPI, licenseFormatAPI].forEach {
     it.configure {
         source = sourceSets.main.java

src/main/java/dan200/computercraft/shared/BundledRedstone.java

@@ -13,20 +13,19 @@ import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
-import java.util.LinkedHashSet;
+import java.util.ArrayList;
 import java.util.Objects;
-import java.util.Set;
 
 public final class BundledRedstone
 {
-    private static final Set<IBundledRedstoneProvider> providers = new LinkedHashSet<>();
+    private static final ArrayList<IBundledRedstoneProvider> providers = new ArrayList<>();
 
     private BundledRedstone() {}
 
     public static synchronized void register( @Nonnull IBundledRedstoneProvider provider )
     {
         Objects.requireNonNull( provider, "provider cannot be null" );
-        providers.add( provider );
+        if( !providers.contains( provider ) ) providers.add( provider );
     }
 
     public static int getDefaultOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull Direction side )

src/main/java/dan200/computercraft/shared/Registry.java

@@ -25,6 +25,7 @@ import dan200.computercraft.shared.computer.recipe.ComputerUpgradeRecipe;
 import dan200.computercraft.shared.data.BlockNamedEntityLootCondition;
 import dan200.computercraft.shared.data.HasComputerIdLootCondition;
 import dan200.computercraft.shared.data.PlayerCreativeLootCondition;
+import dan200.computercraft.shared.integration.morered.MoreRedIntegration;
 import dan200.computercraft.shared.media.items.ItemDisk;
 import dan200.computercraft.shared.media.items.ItemPrintout;
 import dan200.computercraft.shared.media.items.ItemTreasureDisk;
@@ -85,6 +86,7 @@ import net.minecraftforge.eventbus.api.IEventBus;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fluids.capability.CapabilityFluidHandler;
 import net.minecraftforge.fml.DeferredWorkQueue;
+import net.minecraftforge.fml.ModList;
 import net.minecraftforge.fml.RegistryObject;
 import net.minecraftforge.fml.common.Mod;
 import net.minecraftforge.fml.event.lifecycle.FMLCommonSetupEvent;
@@ -387,6 +389,9 @@ public final class Registry
         ComputerCraftAPI.registerGenericCapability( CapabilityItemHandler.ITEM_HANDLER_CAPABILITY );
         ComputerCraftAPI.registerGenericCapability( CapabilityEnergy.ENERGY );
         ComputerCraftAPI.registerGenericCapability( CapabilityFluidHandler.FLUID_HANDLER_CAPABILITY );
+
+        // Mod integration code.
+        if( ModList.get().isLoaded( MoreRedIntegration.MOD_ID ) ) MoreRedIntegration.initialise();
     }
 
     public static void registerLoot()

src/main/java/dan200/computercraft/shared/integration/morered/MoreRedIntegration.java

@@ -0,0 +1,124 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.shared.integration.morered;
+
+import commoble.morered.api.ChanneledPowerSupplier;
+import commoble.morered.api.MoreRedAPI;
+import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.api.ComputerCraftAPI;
+import dan200.computercraft.shared.common.IBundledRedstoneBlock;
+import dan200.computercraft.shared.util.CapabilityUtil;
+import dan200.computercraft.shared.util.FixedPointTileEntityType;
+import net.minecraft.block.Block;
+import net.minecraft.block.BlockState;
+import net.minecraft.tileentity.TileEntity;
+import net.minecraft.util.Direction;
+import net.minecraft.util.ResourceLocation;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.common.capabilities.Capability;
+import net.minecraftforge.common.capabilities.ICapabilityProvider;
+import net.minecraftforge.common.util.LazyOptional;
+import net.minecraftforge.event.AttachCapabilitiesEvent;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+public class MoreRedIntegration
+{
+    public static final String MOD_ID = "morered";
+
+    private static final ResourceLocation ID = new ResourceLocation( ComputerCraft.MOD_ID, "morered" );
+
+    private static final class BundledPowerSupplier implements ICapabilityProvider, ChanneledPowerSupplier
+    {
+        private final IBundledRedstoneBlock block;
+        private final TileEntity tile;
+        private LazyOptional<ChanneledPowerSupplier> instance;
+
+        private BundledPowerSupplier( IBundledRedstoneBlock block, TileEntity tile )
+        {
+            this.block = block;
+            this.tile = tile;
+        }
+
+        @Nonnull
+        @Override
+        public <T> LazyOptional<T> getCapability( @Nonnull Capability<T> cap, @Nullable Direction side )
+        {
+            if( cap != MoreRedAPI.CHANNELED_POWER_CAPABILITY ) return LazyOptional.empty();
+
+            if( tile.isRemoved() || !block.getBundledRedstoneConnectivity( tile.getLevel(), tile.getBlockPos(), side ) )
+            {
+                return LazyOptional.empty();
+            }
+
+            return (instance == null ? (instance = LazyOptional.of( () -> this )) : instance).cast();
+        }
+
+        @Override
+        public int getPowerOnChannel( @Nonnull World world, @Nonnull BlockPos wirePos, @Nonnull BlockState wireState, @Nullable Direction wireFace, int channel )
+        {
+            if( wireFace == null ) return 0;
+
+            BlockPos pos = wirePos.relative( wireFace );
+            BlockState state = world.getBlockState( pos );
+            if( !(state.getBlock() instanceof IBundledRedstoneBlock) ) return 0;
+
+            IBundledRedstoneBlock block = (IBundledRedstoneBlock) state.getBlock();
+            return (block.getBundledRedstoneOutput( world, pos, wireFace.getOpposite() ) & (1 << channel)) != 0 ? 31 : 0;
+        }
+
+        void invalidate()
+        {
+            instance = CapabilityUtil.invalidate( instance );
+        }
+    }
+
+    @SubscribeEvent
+    public static void attachBlockCapabilities( AttachCapabilitiesEvent<TileEntity> event )
+    {
+        TileEntity tile = event.getObject();
+        if( !(tile.getType() instanceof FixedPointTileEntityType) ) return;
+
+        Block block = ((FixedPointTileEntityType<?>) tile.getType()).getBlock();
+        if( !(block instanceof IBundledRedstoneBlock) ) return;
+
+        BundledPowerSupplier provider = new BundledPowerSupplier( (IBundledRedstoneBlock) block, tile );
+        event.addCapability( ID, provider );
+        event.addListener( provider::invalidate );
+    }
+
+    public static void initialise()
+    {
+        MinecraftForge.EVENT_BUS.register( MoreRedIntegration.class );
+        ComputerCraftAPI.registerBundledRedstoneProvider( MoreRedIntegration::getBundledPower );
+    }
+
+    private static int getBundledPower( World world, BlockPos pos, Direction side )
+    {
+        TileEntity tile = world.getBlockEntity( pos );
+        if( tile == null ) return -1;
+
+        ChanneledPowerSupplier power = CapabilityUtil.unwrapUnsafe( tile.getCapability( MoreRedAPI.CHANNELED_POWER_CAPABILITY, side ) );
+        if( power == null ) return -1;
+
+        BlockState state = tile.getBlockState();
+
+        // Skip ones already handled by CC. We can do this more efficiently.
+        if( state.getBlock() instanceof IBundledRedstoneBlock ) return -1;
+
+        int mask = 0;
+        for( int i = 0; i < 16; i++ )
+        {
+            mask |= power.getPowerOnChannel( world, pos, state, side, i ) > 0 ? (1 << i) : 0;
+        }
+
+        return mask;
+    }
+}

src/main/java/dan200/computercraft/shared/util/CapabilityUtil.java

@@ -43,4 +43,10 @@ public final class CapabilityUtil
         p.addListener( invalidate );
         return p.orElseThrow( NullPointerException::new );
     }
+
+    @Nullable
+    public static <T> T unwrapUnsafe( LazyOptional<T> p )
+    {
+        return !p.isPresent() ? null : p.orElseThrow( NullPointerException::new );
+    }
 }

src/main/java/dan200/computercraft/shared/util/FixedPointTileEntityType.java

@@ -40,6 +40,11 @@ public final class FixedPointTileEntityType<T extends TileEntity> extends TileEn
         return block == this.block.get();
     }
 
+    public Block getBlock()
+    {
+        return block.get();
+    }
+
     private static final class FixedPointSupplier<T extends TileEntity> implements Supplier<T>
     {
         final FixedPointTileEntityType<T> factory;