Add a link to the success message when adding a product to the compare list

Author: avstudnitz

app/code/Magento/Catalog/Controller/Product/Compare/Add.php

@@ -36,7 +36,14 @@ public function execute()
                 $productName = $this->_objectManager->get(
                     \Magento\Framework\Escaper::class
                 )->escapeHtml($product->getName());
-                $this->messageManager->addSuccess(__('You added product %1 to the comparison list.', $productName));
+                $this->messageManager->addComplexSuccessMessage(
+                    'addCompareAddSuccessMessage',
+                    [
+                        'product_name' => $productName,
+                        'compare_list_url' => $this->_url->getUrl('catalog/product_compare')
+                    ]
+                );
+
                 $this->_eventManager->dispatch('catalog_product_compare_add_product', ['product' => $product]);
             }
 

app/code/Magento/Catalog/etc/frontend/di.xml

@@ -79,4 +79,16 @@
             <argument name="typeId" xsi:type="string">recently_compared_product</argument>
         </arguments>
     </virtualType>
+    <type name="Magento\Framework\View\Element\Message\MessageConfigurationsPool">
+        <arguments>
+            <argument name="configurationsMap" xsi:type="array">
+                <item name="addCompareAddSuccessMessage" xsi:type="array">
+                    <item name="renderer" xsi:type="const">\Magento\Framework\View\Element\Message\Renderer\BlockRenderer::CODE</item>
+                    <item name="data" xsi:type="array">
+                        <item name="template" xsi:type="string">Magento_Catalog::messages/addCompareAddSuccessMessage.phtml</item>
+                    </item>
+                </item>
+            </argument>
+        </arguments>
+    </type>
 </config>

app/code/Magento/Catalog/view/frontend/templates/messages/addCompareAddSuccessMessage.phtml

@@ -0,0 +1,14 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+// @codingStandardsIgnoreFile
+/** @var \Magento\Framework\View\Element\Template $block */
+?>
+<?= $block->escapeHtml(__(
+    'You added product %1 to the <a href="%2">comparison list</a>.',
+    $block->getData('product_name'),
+    $block->getData('compare_list_url')),
+    ['a']
+);

dev/tests/integration/testsuite/Magento/Catalog/Controller/Product/CompareTest.php

@@ -47,7 +47,7 @@ public function testAddAction()
         );
 
         $this->assertSessionMessages(
-            $this->equalTo(['You added product Simple Product 1 Name to the comparison list.']),
+            $this->equalTo(['You added product Simple Product 1 Name to the <a href="http://localhost/index.php/catalog/product_compare/">comparison list</a>.']),
             MessageInterface::TYPE_SUCCESS
         );