[RELEASED] Override Engine for OpenCart

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<?php

/* ---------------------------------------------------------------------------------- */
/*  OpenCart Action (with support for the Override Engine)                            */
/*                                                                                    */
/*  Original file Copyright © 2012-2014 by Daniel Kerr (www.opencart.com)             */
/*  Modifications Copyright © 2014 by J.Neuhoff (www.mhccorp.com)                     */
/*                                                                                    */
/*  This file is part of OpenCart.                                                    */
/*                                                                                    */
/*  OpenCart is free software: you can redistribute it and/or modify                  */
/*  it under the terms of the GNU General Public License as published by              */
/*  the Free Software Foundation, either version 3 of the License, or                 */
/*  (at your option) any later version.                                               */
/*                                                                                    */
/*  OpenCart is distributed in the hope that it will be useful,                       */
/*  but WITHOUT ANY WARRANTY; without even the implied warranty of                    */
/*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                     */
/*  GNU General Public License for more details.                                      */
/*                                                                                    */
/*  You should have received a copy of the GNU General Public License                 */
/*  along with OpenCart.  If not, see <http://www.gnu.org/licenses/>.                 */
/* ---------------------------------------------------------------------------------- */

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$parts = explode('/', str_replace('../', '', (string)$route));

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		return $product;

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	<?php
	class addon_x_ModelCatalogProduct extends ModelCatalogProduct {
	
		/* override method */
		public function getProduct($product_id) {
			$product = parent::getProduct( $product_id );
			if ($product) {
				$sql  = "SELECT myfield FROM `".DB_PREFIX.product` ";
				$sql .= "WHERE product_id='".(int)$product_id."'";
				$result = $this->db->query($sql);
				$product['myfield'] = $result->row['myfield'];
			} else {
				$product['myfield'] = '';
			}
		}
	}
	?>

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	<?php
	class addon_x_ModelCatalogProduct extends ModelCatalogProduct {
	
		/* override method */
		public function getProduct($product_id) {
			$product = parent::getProduct( $product_id );
			if ($product) {
				$sql  = "SELECT myfield FROM `".DB_PREFIX.product` ";
				$sql .= "WHERE product_id='".(int)$product_id."'";
				$result = $this->db->query($sql);
				$product['myfield'] = $result->row['myfield'];
			} else {
				$product['myfield'] = '';
			}

			return $product;
		}
	}
	?>

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			// modify template file
			$template_buffer = str_replace(
				'<?php echo $description; ?>',
				'<?php echo $description; ?><br /><?php echo $text_myfield; ?>:<?php echo $myfield; ?>'
			);

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			// modify template file
			$template_buffer = str_replace(
				'<?php echo $description; ?>',
				'<?php echo $description; ?><br /><?php echo $text_myfield; ?>:<?php echo $myfield; ?>',
			$template_buffer
			);

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class stock_ControllerCatalogProduct extends ControllerCatalogProduct {
protected function getForm() {
		$data['heading_title'] = $this->language->get('heading_title');

          
                $this->load->model('module/stock');
                $data['entry_has_option'] = $this->language->get('entry_has_option');
                $data['tab_stock'] = $this->language->get('tab_stock');

		$this->response->setOutput($this->load->view('catalog/product_form.tpl', $data));
	parent::getForm();
}

	public function preRender( $template_buffer, $template_name, &$data ) {
		switch ($template_name) {
                case "catalog/product_form.tpl":
                $search ='<li><a href="#tab-option" data-toggle="tab"><?php echo $tab_option; ?></a></li>';
		
              $replace='<li><a href="#tab-stock" data-toggle="tab"><?php echo $tab_stock; ?></a></li> ';
        
        $template_buffer = str_replace(
            $search,
            $replace,
            $template_buffer
        );
        break;
      } 
		
		return parent::preRender( $template_buffer, $template_name, $data );
	}

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class stock_ControllerProductProduct extends ControllerProductProduct {

	/* overridden method, always called before the final rendering */
	public function preRender( $template_buffer, $template_name, &$data ) {
		if ($template_name != 'catalog/product_form.tpl') {
			return parent::preRender( $template_buffer, $template_name, $data );
		}
	
		// add new controller variables
		$this->load->model('module/stock');
		$data['entry_has_option'] = $this->language->get('entry_has_option');
		$data['tab_stock'] = $this->language->get('tab_stock');

		// modify template file
		// ... do whatever is needed to modify the product_form.tpl ....
		$template_buffer = str_replace( .... );

		// call parent method
		return parent::preRender( $template_buffer, $template_name, $data );
	}
}