Improved error message for CMS page delete

app/code/core/Mage/Cms/Helper/Page.php

@@ -176,4 +176,67 @@ public static function getUsedInStoreConfigPaths(?array $paths = []): array
 
         return $searchPaths;
     }
+
+    /**
+     * @param self::XML_PATH_* $path
+     */
+    public static function getConfigLabelFromConfigPath(string $path): string
+    {
+        return match ($path) {
+            self::XML_PATH_NO_ROUTE_PAGE => Mage::helper('cms')->__('No Route Page'),
+            self::XML_PATH_NO_COOKIES_PAGE => Mage::helper('cms')->__('No Cookies Page'),
+            self::XML_PATH_HOME_PAGE => Mage::helper('cms')->__('Home Page'),
+            default => $path,
+        };
+    }
+
+    /**
+     * @param Mage_Adminhtml_Block_System_Config_Form::SCOPE_* $scope
+     * @throws Mage_Core_Exception
+     */
+    public static function getScopeInfoFromConfigScope(string $scope, string $scopeId): string
+    {
+        return match ($scope) {
+            Mage_Adminhtml_Block_System_Config_Form::SCOPE_DEFAULT => Mage::helper('cms')->__('Default Config'),
+            Mage_Adminhtml_Block_System_Config_Form::SCOPE_WEBSITES => Mage::app()->getWebsite($scopeId)->getName(),
+            Mage_Adminhtml_Block_System_Config_Form::SCOPE_STORES => sprintf(
+                '%s "%s"',
+                Mage::app()->getStore($scopeId)->getGroup()->getName(),
+                Mage::app()->getStore($scopeId)->getName(),
+            ),
+        };
+    }
+
+    /**
+     * @throws Mage_Core_Exception
+     */
+    public static function getValidateConfigErrorMessage(Mage_Core_Model_Resource_Db_Collection_Abstract $isUsedInConfig): string
+    {
+        $messages = [];
+
+        $data = $isUsedInConfig->getData();
+        foreach ($data as $key => $item) {
+            $path = $item['path'];
+            unset($item['config_id'], $item['path'], $item['updated_at'], $item['value']);
+            $data[$path][] = $item;
+            unset($data[$key], $key, $path);
+        }
+
+        foreach ($data as $path => $items) {
+            $scopes = [];
+            foreach ($items as $item) {
+                $scopes[] = self::getScopeInfoFromConfigScope($item['scope'], $item['scope_id']);
+            }
+
+            $messages[] = sprintf(
+                '"%s" (%s)',
+                self::getConfigLabelFromConfigPath($path),
+                implode(', ', $scopes),
+            );
+        }
+
+        unset($data, $path, $items, $item, $scopes);
+
+        return implode(', ', $messages);
+    }
 }

app/code/core/Mage/Cms/Model/Resource/Page.php

@@ -39,8 +39,9 @@ protected function _beforeDelete(Mage_Core_Model_Abstract $object)
                 $object->setId(null);
                 Mage::throwException(
                     Mage::helper('cms')->__(
-                        'Cannot delete page, it is used in "%s".',
-                        implode(', ', $isUsedInConfig->getColumnValues('path')),
+                        'Cannot delete page, it is used in <a href="%s">configuration</a> for %s.',
+                        Mage::helper('adminhtml')->getUrl('adminhtml/system_config/edit', ['section' => 'web']),
+                        Mage_Cms_Helper_Page::getValidateConfigErrorMessage($isUsedInConfig),
                     ),
                 );
             }
@@ -79,8 +80,9 @@ protected function _beforeSave(Mage_Core_Model_Abstract $object)
                 $object->setIsActive(true);
                 Mage::getSingleton('adminhtml/session')->addWarning(
                     Mage::helper('cms')->__(
-                        'Cannot disable page, it is used in configuration "%s".',
-                        implode(', ', $isUsedInConfig->getColumnValues('path')),
+                        'Cannot disable page, it is used in <a href="%s">configuration</a> for %s.',
+                        Mage::helper('adminhtml')->getUrl('adminhtml/system_config/edit', ['section' => 'web']),
+                        Mage_Cms_Helper_Page::getValidateConfigErrorMessage($isUsedInConfig),
                     ),
                 );
             }
@@ -282,7 +284,9 @@ protected function isValidPageIdentifier(Mage_Core_Model_Abstract $object)
 
     public function getUsedInStoreConfigCollection(Mage_Cms_Model_Page $page, ?array $paths = []): Mage_Core_Model_Resource_Db_Collection_Abstract
     {
-        $storeIds   = (array) $page->getStoreId();
+        $storeId    = (array) $page->getStoreId(); # null on save
+        $stores     = (array) $page->getStores(); # null on delete
+        $storeIds   = array_merge($storeId, $stores);
         $storeIds[] = Mage_Core_Model_App::ADMIN_STORE_ID;
         $config     = Mage::getResourceModel('core/config_data_collection')
             ->addFieldToFilter('value', $page->getIdentifier())

app/code/core/Mage/Cms/etc/system.xml

@@ -17,7 +17,7 @@
                             <label>CMS Home Page</label>
                             <frontend_type>select</frontend_type>
                             <source_model>adminhtml/system_config_source_cms_page</source_model>
-                            <sort_order>1</sort_order>
+                            <sort_order>21</sort_order>
                             <show_in_default>1</show_in_default>
                             <show_in_website>1</show_in_website>
                             <show_in_store>1</show_in_store>
@@ -26,7 +26,7 @@
                             <label>CMS No Route Page</label>
                             <frontend_type>select</frontend_type>
                             <source_model>adminhtml/system_config_source_cms_page</source_model>
-                            <sort_order>2</sort_order>
+                            <sort_order>22</sort_order>
                             <show_in_default>1</show_in_default>
                             <show_in_website>1</show_in_website>
                             <show_in_store>1</show_in_store>
@@ -35,7 +35,7 @@
                             <label>CMS No Cookies Page</label>
                             <frontend_type>select</frontend_type>
                             <source_model>adminhtml/system_config_source_cms_page</source_model>
-                            <sort_order>3</sort_order>
+                            <sort_order>23</sort_order>
                             <show_in_default>1</show_in_default>
                             <show_in_website>1</show_in_website>
                             <show_in_store>1</show_in_store>
@@ -44,7 +44,7 @@
                             <label>Show Breadcrumbs for CMS Pages</label>
                             <frontend_type>select</frontend_type>
                             <source_model>adminhtml/system_config_source_yesno</source_model>
-                            <sort_order>5</sort_order>
+                            <sort_order>25</sort_order>
                             <show_in_default>1</show_in_default>
                             <show_in_website>1</show_in_website>
                             <show_in_store>1</show_in_store>

app/locale/en_US/Mage_Cms.csv

@@ -27,10 +27,10 @@
 "CMS Static Block","CMS Static Block"
 "CMS Static Block Default Template","CMS Static Block Default Template"
 "Cannot create new directory.","Cannot create new directory."
-"Cannot delete page, it is used in ""%s"".","Cannot delete page, it is used in ""%s""."
+"Cannot delete page, it is used in <a href=""%s"">configuration</a> for %s.","Cannot delete page, it is used in <a href=""%s"">configuration</a> for %s."
 "Cannot delete directory %s.","Cannot delete directory %s."
 "Cannot delete root directory %s.","Cannot delete root directory %s."
-"Cannot disable page, it is used in configuration ""%s"".","Cannot disable page, it is used in configuration ""%s""."
+"Cannot disable page, it is used in <a href=""%s"">configuration</a> for %s.","Cannot disable page, it is used in <a href=""%s"">configuration</a> for %s."
 "Cannot upload file.","Cannot upload file."
 "Collapse All","Collapse All"
 "Content","Content"