Added a "hand" pseudo block type that uses the currently selected block.

src/main/java/com/sk89q/worldedit/WorldEdit.java

@@ -397,44 +397,55 @@ public class WorldEdit {
         int data = -1;
 
         boolean parseDataValue = true;
+        if ("hand".equalsIgnoreCase(testID)) {
+            // Get the block type from the item in the user's hand.
+            final BaseBlock blockInHand = player.getBlockInHand();
+            if (blockInHand.getClass() != BaseBlock.class) {
+                return blockInHand;
+            }
 
-        // Attempt to parse the item ID or otherwise resolve an item/block
-        // name to its numeric ID
-        try {
-            blockId = Integer.parseInt(testID);
+            blockId = blockInHand.getId();
             blockType = BlockType.fromID(blockId);
-        } catch (NumberFormatException e) {
-            blockType = BlockType.lookup(testID);
-            if (blockType == null) {
-                int t = server.resolveItem(testID);
-                if (t > 0) {
-                    blockType = BlockType.fromID(t); // Could be null
-                    blockId = t;
+            data = blockInHand.getData();
+        } else {
+            // Attempt to parse the item ID or otherwise resolve an item/block
+            // name to its numeric ID
+            try {
+                blockId = Integer.parseInt(testID);
+                blockType = BlockType.fromID(blockId);
+            } catch (NumberFormatException e) {
+                blockType = BlockType.lookup(testID);
+                if (blockType == null) {
+                    int t = server.resolveItem(testID);
+                    if (t > 0) {
+                        blockType = BlockType.fromID(t); // Could be null
+                        blockId = t;
+                    }
                 }
             }
-        }
 
-        if (blockId == -1 && blockType == null) {
-            // Maybe it's a cloth
-            ClothColor col = ClothColor.lookup(testID);
-            if (col == null) {
-                throw new UnknownItemException(arg);
+            if (blockId == -1 && blockType == null) {
+                // Maybe it's a cloth
+                ClothColor col = ClothColor.lookup(testID);
+                if (col == null) {
+                    throw new UnknownItemException(arg);
+                }
+
+                blockType = BlockType.CLOTH;
+                data = col.getID();
+
+                // Prevent overriding the data value
+                parseDataValue = false;
             }
 
-            blockType = BlockType.CLOTH;
-            data = col.getID();
+            // Read block ID
+            if (blockId == -1) {
+                blockId = blockType.getID();
+            }
 
-            // Prevent overriding the data value
-            parseDataValue = false;
-        }
-
-        // Read block ID
-        if (blockId == -1) {
-            blockId = blockType.getID();
-        }
-
-        if (!player.getWorld().isValidBlockType(blockId)) {
-            throw new UnknownItemException(arg);
+            if (!player.getWorld().isValidBlockType(blockId)) {
+                throw new UnknownItemException(arg);
+            }
         }
 
         if (!allowNoData && data == -1) {