Bring back CmsBlock source model.

Model/Config/Source/CmsBlock.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace Swissup\Core\Model\Config\Source;
+
+use Magento\Cms\Model\ResourceModel\Block\CollectionFactory;
+
+class CmsBlock implements \Magento\Framework\Data\OptionSourceInterface
+{
+    /**
+     * Block collection factory
+     *
+     * @var CollectionFactory
+     */
+    protected $blockCollectionFactory;
+
+    /**
+     * Construct
+     *
+     * @param CollectionFactory $blockCollectionFactory
+     */
+    public function __construct(CollectionFactory $blockCollectionFactory)
+    {
+        $this->blockCollectionFactory = $blockCollectionFactory;
+    }
+
+    /**
+     * Get options
+     *
+     * @return array
+     */
+    public function toOptionArray()
+    {
+        $collection = $this->blockCollectionFactory->create()
+            ->setOrder('title', 'ASC');
+
+        $options = [];
+        foreach ($collection as $block) {
+            $entry = [
+                'value' => $block->getId(),
+                'label' => $block->getTitle()
+            ];
+
+            if (is_array($block->getStoreId()) && !in_array(0, $block->getStoreId())) {
+                $entry['label'] .= ' (' . implode(', ', $block->getStoreId()) . ')';
+            }
+
+            $options[] = $entry;
+        }
+
+        array_unshift($options, ['value' => '0', 'label' => __('No')]);
+
+        return $options;
+    }
+}