PaperMC/nms-patches/BlockRedstoneTorch.patch

--- a/net/minecraft/server/BlockRedstoneTorch.java
+++ b/net/minecraft/server/BlockRedstoneTorch.java
@@ -6,6 +6,8 @@
 import java.util.Random;
 import java.util.WeakHashMap;
 
+import org.bukkit.event.block.BlockRedstoneEvent; // CraftBukkit
+
 public class BlockRedstoneTorch extends BlockTorch {
 
     public static final BlockStateBoolean LIT = BlockProperties.r;
@@ -62,8 +64,24 @@
             list.remove(0);
         }
 
+        // CraftBukkit start
+        org.bukkit.plugin.PluginManager manager = worldserver.getServer().getPluginManager();
+        org.bukkit.block.Block block = worldserver.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ());
+        int oldCurrent = ((Boolean) iblockdata.get(BlockRedstoneTorch.LIT)).booleanValue() ? 15 : 0;
+
+        BlockRedstoneEvent event = new BlockRedstoneEvent(block, oldCurrent, oldCurrent);
+        // CraftBukkit end
         if ((Boolean) iblockdata.get(BlockRedstoneTorch.LIT)) {
             if (flag) {
+                // CraftBukkit start
+                if (oldCurrent != 0) {
+                    event.setNewCurrent(0);
+                    manager.callEvent(event);
+                    if (event.getNewCurrent() != 0) {
+                        return;
+                    }
+                }
+                // CraftBukkit end
                 worldserver.setTypeAndData(blockposition, (IBlockData) iblockdata.set(BlockRedstoneTorch.LIT, false), 3);
                 if (a(worldserver, blockposition, true)) {
                     worldserver.triggerEffect(1502, blockposition, 0);
@@ -71,6 +89,15 @@
                 }
             }
         } else if (!flag && !a(worldserver, blockposition, false)) {
+            // CraftBukkit start
+            if (oldCurrent != 15) {
+                event.setNewCurrent(15);
+                manager.callEvent(event);
+                if (event.getNewCurrent() != 15) {
+                    return;
+                }
+            }
+            // CraftBukkit end
             worldserver.setTypeAndData(blockposition, (IBlockData) iblockdata.set(BlockRedstoneTorch.LIT, true), 3);
         }