Want to add all the products in your cart to your Wishlist, in one click?
I’ll show you how to do it here 
This procedure will take you 5 Minutes
We will begin to override the Wishlist Controller.
We do this by creating a folder called Mycompany in your webroot /app/code/local/ and inside it, we’ll add the folder: Addcwl
Inside this folder we will create two extra folders:
etc
controllers
Now, we are ready to begin:
In WEBROOT/app/code/local/Mycompany/Addcwl/etc/ create the file config.xml
Inside this file put the following,
<?xml version="1.0" encoding="utf-8" ?>
<config>
<!-- snip -->
<frontend>
<routers>
<wishlist>
<args>
<modules>
<Mycompany_Addcwl before="Mage_Wishlist">
Mycompany_Addcwl
</Mycompany_Addcwl>
</modules>
</args>
</wishlist>
</routers>
</frontend>
</config>
The above code allows you to override the Wishlist controller 
Now, in WEBROOT/app/code/local/Mycompany/Addcwl/controllers/ create the file
IndexController.php
Inside this file put the following:
<?php
* @category BUYX
* @package
* @copyright Copyright (c)
* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0)
*/
/**
* Wishlist front controller
*
* @category BUYX
* @package
* @author Winston nolan <winston@buyxonline.com>
*/
include_once("Mage/Wishlist/controllers/IndexController.php");
class Mycompany_Addcwl_IndexController extends Mage_Wishlist_IndexController
{
//we test our controller override with this
/*
public function indexAction()
{
# Just to make sure
error_log('Yes, I did it!');
parent::indexAction();
}
*/
/**
* Adding new item
*/
public function addcartAction()
{
$session = Mage::getSingleton('customer/session');
$wishlist = $this->_getWishlist();
if (!$wishlist) {
$this->_redirect('*/');
return;
}
// We store the id's of our products in the cart, in our core session
$ids = Mage::getSingleton('core/session')->getWishListIds();
// Here we explode our id's
$ids = explode('-', $ids);
//do a foreach on them
foreach ($ids as $productId) {
$product = Mage::getModel('catalog/product')->load($productId);
try {
$wishlist->addNewItem($productId);
Mage::dispatchEvent('wishlist_addcart_product', array('wishlist'=>$wishlist, 'product'=>$product));
//unset wishlist id's in session
Mage::getSingleton('core/session')->unsWishListIds();
if ($referer = $session->getBeforeWishlistUrl()) {
$session->setBeforeWishlistUrl(null);
}
else {
$referer = $this->_getRefererUrl();
}
$message = $this->__('%1$s was successfully added to your wishlist. Click <a href="%2$s">here</a> to continue shopping', $product->getName(), $referer);
$session->addSuccess($message);
}
catch (Mage_Core_Exception $e) {
$session->addError($this->__('There was an error while adding item to wishlist: %s', $e->getMessage()));
}
catch (Exception $e) {
//$session->addError($this->__('There was an error while adding item to wishlist.'));
}
$this->_redirect('*');
}
}
}
Now that have the controller wrapped up, we need to modify one file called sidebar.phtml
The file is located here here:
WEBROOT/app/design/frontend/YOURPACKAGE/YOURTHEME/checkout/sidebar/sidebar.phtml
In this file we’ll make the following change around line 56
<?php //first we'll make our id's null ?>
<?php $ids = null; ?>
<?php foreach($_items as $_item): ?>
<?php echo $this->getItemHtml($_item) ?>
<?php now we'll concatenate our Id's into a string
<?php $ids .= '-' . $_item['product_id']; ?>
<?php endforeach; ?>
<?php
//finally, we'll store the id's into our core session
Mage::getSingleton('core/session')->setWishListIds($ids);
//setup some debug logging to see what we're doing
//$session = Mage::getSingleton('core/session');
//Mage::Helper('debug')->log($session);
?>
And we’ll add the Add All to Wishlist button/link here:
<!-- add all items to wishlist -->
<button style="margin-right:5px;" class="form-button" type="button" onclick="setLocation('<?php echo Mage::getBaseUrl(); ?>wishlist/index/addcart/product/')">
<span><?php echo $this->__('Add to my Wishlist') ?></span>
</button>
And now for the Grand Finale!
We’ll activate our module by creating a file in
WEBROOT/app/etc/modules/Mycompany_Addcwl.xml
Inside this file we’ll put the following
<?xml version="1.0"?>
<config>
<modules>
<!-- Activate Add All in Cart to Wishlist Module -->
<Mycompany_Addcwl>
<active>true</active>
<codePool>local</codePool>
</Mycompany_Addcwl>
</modules>
</config>
Congratulations, have a beer! You can now add all the products in your cart to your wishlist
