fCraft.BuildingCommands.RedoHandler C# (CSharp) Method

        private static void RedoHandler( Player player, Command cmd )
        {
            if ( cmd.HasNext ) {
                CdRedo.PrintUsage( player );
                return;
            }

            World playerWorld = player.World;
            if ( playerWorld == null )
                PlayerOpException.ThrowNoWorld( player );

            UndoState redoState = player.RedoPop();
            if ( redoState == null ) {
                player.MessageNow( "There is currently nothing to redo." );
                return;
            }

            string msg = "Redo: ";
            if ( redoState.Op != null && !redoState.Op.IsDone ) {
                redoState.Op.Cancel();
                msg += String.Format( "Cancelled {0} (was {1}% done). ",
                                     redoState.Op.Description,
                                     redoState.Op.PercentDone );
            }

            // no need to set player.drawingInProgress here because this is done on the user thread
            Logger.Log( LogType.UserActivity,
                        "Player {0} initiated /Redo affecting {1} blocks (on world {2})",
                        player.Name,
                        redoState.Buffer.Count,
                        playerWorld.Name );

            msg += String.Format( "Restoring {0} blocks. Type &H/Undo&S to reverse.",
                                  redoState.Buffer.Count );
            player.MessageNow( msg );

            var op = new UndoDrawOperation( player, redoState, true );
            op.Prepare( new Vector3I[0] );
            op.Begin();
        }