Make computer rotatable.

src/main/java/li/cil/oc2/common/block/ComputerBlock.java

@@ -6,6 +6,7 @@ import li.cil.oc2.common.container.ComputerContainer;
 import li.cil.oc2.common.tile.ComputerTileEntity;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
+import net.minecraft.block.HorizontalBlock;
 import net.minecraft.block.SoundType;
 import net.minecraft.block.material.Material;
 import net.minecraft.client.Minecraft;
@@ -14,21 +15,49 @@ import net.minecraft.entity.player.PlayerInventory;
 import net.minecraft.entity.player.ServerPlayerEntity;
 import net.minecraft.inventory.container.Container;
 import net.minecraft.inventory.container.INamedContainerProvider;
+import net.minecraft.item.BlockItemUseContext;
+import net.minecraft.state.DirectionProperty;
+import net.minecraft.state.StateContainer;
 import net.minecraft.tileentity.TileEntity;
-import net.minecraft.util.ActionResultType;
-import net.minecraft.util.Hand;
+import net.minecraft.util.*;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.BlockRayTraceResult;
 import net.minecraft.util.text.ITextComponent;
 import net.minecraft.world.IBlockReader;
+import net.minecraft.world.IWorld;
 import net.minecraft.world.World;
 import net.minecraftforge.fml.network.NetworkHooks;
 
 import javax.annotation.Nullable;
 
 public final class ComputerBlock extends Block {
+    public static final DirectionProperty FACING = HorizontalBlock.HORIZONTAL_FACING;
+
     public ComputerBlock() {
         super(Properties.create(Material.IRON).sound(SoundType.METAL));
+        setDefaultState(getStateContainer().getBaseState().with(FACING, Direction.NORTH));
+    }
+
+    @Override
+    protected void fillStateContainer(final StateContainer.Builder<Block, BlockState> builder) {
+        super.fillStateContainer(builder);
+        builder.add(FACING);
+    }
+
+    @Override
+    public BlockState getStateForPlacement(final BlockItemUseContext context) {
+        return super.getDefaultState().with(FACING, context.getPlacementHorizontalFacing().getOpposite());
+    }
+
+    @Override
+    public BlockState rotate(final BlockState state, final IWorld world, final BlockPos pos, final Rotation direction) {
+        return state.with(FACING, direction.rotate(state.get(FACING)));
+    }
+
+    @SuppressWarnings("deprecation")
+    @Override
+    public BlockState mirror(final BlockState state, final Mirror mirrorIn) {
+        return state.rotate(mirrorIn.toRotation(state.get(FACING)));
     }
 
     @Override
@@ -53,11 +82,7 @@ public final class ComputerBlock extends Block {
         final ComputerTileEntity computer = (ComputerTileEntity) tileEntity;
         if (player.isSneaking()) {
             if (!world.isRemote()) {
-                if (computer.isRunning()) {
-                    return ActionResultType.CONSUME;
-                } else {
-                    computer.start();
-                }
+                computer.start();
             }
         } else {
             final boolean openContainer = false; // TODO