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<?php 
// actual example of how it would look like:

<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Academic Free License (AFL 3.0)
 * that is bundled with this package in the file LICENSE_AFL.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/afl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magento.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magento.com for more information.
 *
 * @category    design
 * @package     base_default
 * @copyright   Copyright (c) 2006-2014 X.commerce, Inc. (http://www.magento.com)
 * @license     http://opensource.org/licenses/afl-3.0.php  Academic Free License (AFL 3.0)
 */
?>
<?php
/**
 * Category view template
 *
 * @see Mage_Catalog_Block_Category_View
 */
?>

<?php 
/*

this template comes from the base template, copied into our custom theme
app/design/frontend/base/default/template/catalog/category/view.phtml

 the following code will go directly into the product details if the category contains only 1 product,
 instead of loading the default category template and then clicking on the thumbnail 
 and then going to the product detail
 
 reference :
 http://www.codeboss.in/web-funda/2015/01/30/magento-auto-redirect-to-product-details-page-if-category-have-only-one-product/

*/
$product = Mage::registry('current_product');  
if($product == ''){
    $category = Mage::registry('current_category');
    if(is_object($category)){
        $catLoaded = Mage::getModel('catalog/category')->load($category->getEntityId());
        $collection = $catLoaded->getProductCollection();
        $collection->addAttributeToSelect('*');
        if(count($collection) == 1){
            foreach($collection as $product){
                $productUrl = $product->getProductUrl();
                header("location:$productUrl");
                exit;
            }
        }
    }
}


?>


<?php
    $_helper    = $this->helper('catalog/output');
    $_category  = $this->getCurrentCategory();
    $_imgHtml   = '';
    if ($_imgUrl = $_category->getImageUrl()) {
        $_imgHtml = '<p class="category-image"><img src="'.$_imgUrl.'" alt="'.$this->escapeHtml($_category->getName()).'" title="'.$this->escapeHtml($_category->getName()).'" /></p>';
        $_imgHtml = $_helper->categoryAttribute($_category, $_imgHtml, 'image');
    }
?>
<div class="page-title category-title">
    <?php if($this->IsRssCatalogEnable() && $this->IsTopCategory()): ?>
        <a href="<?php echo $this->getRssLink() ?>" class="link-rss"><?php echo $this->__('Subscribe to RSS Feed') ?></a>
    <?php endif; ?>
    <h1><?php echo $_helper->categoryAttribute($_category, $_category->getName(), 'name') ?></h1>
</div>

<?php echo $this->getMessagesBlock()->toHtml() ?>

<?php if($_imgUrl): ?>
    <?php echo $_imgHtml ?>
<?php endif; ?>

<?php if($_description=$this->getCurrentCategory()->getDescription()): ?>
    <div class="category-description std">
        <?php echo $_helper->categoryAttribute($_category, $_description, 'description') ?>
    </div>
    <?php endif; ?>

<?php if($this->isContentMode()): ?>
    <?php echo $this->getCmsBlockHtml() ?>

<?php elseif($this->isMixedMode()): ?>
    <?php echo $this->getCmsBlockHtml() ?>
    <?php echo $this->getProductListHtml() ?>

<?php else: ?>
    <?php echo $this->getProductListHtml() ?>
<?php endif; ?>




?>