Added multiple undo/redo, fixed compile error.

plugin.yml

@@ -80,10 +80,10 @@ commands:
         usage: /<command> 
     /redo:
         description: Redoes the last action (from history)
-        usage: /<command> 
+        usage: /<command> [times]
     /undo:
         description: Undoes the last action
-        usage: /<command> 
+        usage: /<command> [times]
     unstuck:
         description: Escape from being stuck inside a block
         usage: /<command> 

src/com/sk89q/worldedit/bukkit/WorldEditPlugin.java

@@ -47,9 +47,9 @@ import com.sk89q.worldedit.regions.Region;
 public class WorldEditPlugin extends JavaPlugin {
     private static final Logger logger = Logger.getLogger("Minecraft.WorldEdit");
     
-    private final ServerInterface server;
-    private final WorldEdit controller;
-    private final WorldEditAPI api;
+    final ServerInterface server;
+    final WorldEdit controller;
+    final WorldEditAPI api;
     
     private final LocalConfiguration config;
     private final PermissionsResolverManager perms;

src/com/sk89q/worldedit/commands/HistoryCommands.java

@@ -32,43 +32,52 @@ import com.sk89q.worldedit.*;
 public class HistoryCommands {
     @Command(
         aliases = {"/undo"},
-        usage = "",
+        usage = "[times]",
         desc = "Undoes the last action",
         min = 0,
-        max = 0
+        max = 1
     )
     @CommandPermissions({"worldedit.history.undo"})
     public static void undo(CommandContext args, WorldEdit we,
             LocalSession session, LocalPlayer player, EditSession editSession)
             throws WorldEditException {
         
+        int times = Math.max(1, args.getInteger(0, 1));
+        
+        for (int i = 0; i < times; i++) {
             EditSession undone = session.undo(session.getBlockBag(player));
             if (undone != null) {
                 player.print("Undo successful.");
                 we.flushBlockBag(player, undone);
             } else {
-            player.printError("Nothing to undo.");
+                player.printError("Nothing left to undo.");
+                break;
+            }
         }
     }
     
     @Command(
         aliases = {"/redo"},
-        usage = "",
+        usage = "[times]",
         desc = "Redoes the last action (from history)",
         min = 0,
-        max = 0
+        max = 1
     )
     @CommandPermissions({"worldedit.history.redo"})
     public static void redo(CommandContext args, WorldEdit we,
             LocalSession session, LocalPlayer player, EditSession editSession)
             throws WorldEditException {
         
+        int times = Math.max(1, args.getInteger(0, 1));
+        
+        for (int i = 0; i < times; i++) {
             EditSession redone = session.redo(session.getBlockBag(player));
             if (redone != null) {
                 player.print("Redo successful.");
                 we.flushBlockBag(player, redone);
             } else {
-            player.printError("Nothing to redo.");
+                player.printError("Nothing left to redo.");
+            }
         }
     }