gistfile1.aw

<?php

class Helper 
{

    public function isModuleActive($code)
    {
        $module = Mage::getConfig()->getNode("modules/$code");
        $model = Mage::getConfig()->getNode("global/models/$code");
        return $module && $module->is('active') || $model;
    }

    public function compareMageVer($ceVer, $eeVer=null, $op='>=')
    {
        $eeVer = is_null($eeVer) ? $ceVer : $eeVer;
        return $this->isModuleActive('Enterprise_Enterprise')
            ? version_compare(Mage::getVersion(), $eeVer, $op)
            : version_compare(Mage::getVersion(), $ceVer, $op);
    }

    protected $_hasMageFeature = array();
    public function hasMageFeature($feature)
    {
        if (!isset($this->_hasMageFeature[$feature])) {
            $flag = false;
            switch ($feature) {
            case 'order_item.base_cost':
                $flag = $this->compareMageVer('1.4.0.1', '1.8.0', '>=');
                break;

            case 'sales_flat':
                $flag = $this->compareMageVer('1.4.1.0', '1.8.0', '>=');
                break;

            case 'wysiwyg_allowed':
                $flag = $this->compareMageVer('1.4.0');
                break;

            case 'stock_can_subtract_qty':
                $flag = $this->compareMageVer('1.4.1.1', '1.9.0', '>=');
                break;
                
            case 'indexer_1.4':
            case 'table.product_relation':
            case 'table.eav_attribute_label':
            case 'table.catalog_eav_attribute':
            case 'attr.is_wysiwyg_enabled':
                $flag = $this->compareMageVer('1.4', '1.6');
                break;
            case 'track_number':
                $flag = $this->compareMageVer('1.6', '1.11');
                break;
            }
            $this->_hasMageFeature[$feature] = $flag;
        }
        return $this->_hasMageFeature[$feature];
    }