Added //walls.

src/EditSession.java

@@ -608,6 +608,39 @@ public class EditSession {
         return affected;
     }
 
+    /**
+     * Make walls of the region (as if it was a cuboid if it's not).
+     *
+     * @param region
+     * @param block
+     * @return number of blocks affected
+     * @throws MaxChangedBlocksException
+     */
+    public int makeCuboidWalls(Region region, BaseBlock block)
+            throws MaxChangedBlocksException {
+        int affected = 0;
+
+        Vector min = region.getMinimumPoint();
+        Vector max = region.getMaximumPoint();
+
+        for (int x = min.getBlockX(); x <= max.getBlockX(); x++) {
+            for (int y = min.getBlockY(); y <= max.getBlockY(); y++) {
+                if (setBlock(new Vector(x, y, min.getBlockZ()), block)) { affected++; }
+                if (setBlock(new Vector(x, y, max.getBlockZ()), block)) { affected++; }
+                affected++;
+            }
+        }
+
+        for (int y = min.getBlockY(); y <= max.getBlockY(); y++) {
+            for (int z = min.getBlockZ(); z <= max.getBlockZ(); z++) {
+                if (setBlock(new Vector(min.getBlockX(), y, z), block)) { affected++; }
+                if (setBlock(new Vector(max.getBlockX(), y, z), block)) { affected++; }
+            }
+        }
+
+        return affected;
+    }
+
     /**
      * Overlays a layer of blocks over a cuboid area.
      * 

src/WorldEdit.java

@@ -123,6 +123,7 @@ public class WorldEdit {
         commands.put("//size", "Get size of selected region");
         commands.put("//set", "[ID] - Set all blocks inside region");
         commands.put("//outline", "[ID] - Outline the region with blocks");
+        commands.put("//walls", "[ID] - Build walls");
         commands.put("//replace", "<FromID> [ToID] - Replace all existing blocks inside region");
         commands.put("//overlay", "[ID] - Overlay the area one layer");
         commands.put("/removeabove", "<Size> <Height> - Remove blocks above head");
@@ -575,6 +576,15 @@ public class WorldEdit {
 
             return true;
 
+        // Set the walls of a region
+        } else if(split[0].equalsIgnoreCase("//walls")) {
+            checkArgs(split, 1, 1, split[0]);
+            BaseBlock block = getBlock(split[1]);
+            int affected = editSession.makeCuboidWalls(session.getRegion(), block);
+            player.print(affected + " block(s) have been changed.");
+
+            return true;
+
         // Drain pools
         } else if(split[0].equalsIgnoreCase("//drain")) {
             checkArgs(split, 1, 1, split[0]);