Add 'schedule status' column to admin indexer grid

This is a copy of the 'schedule status' column available via command line.

Author: fredden

app/code/Magento/Indexer/Block/Backend/Grid/Column/Renderer/ScheduleStatus.php

@@ -0,0 +1,83 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Indexer\Block\Backend\Grid\Column\Renderer;
+
+use Magento\Backend\Block\Widget\Grid\Column\Renderer\AbstractRenderer;
+use Magento\Framework\Mview\View;
+use Magento\Framework\Phrase;
+
+class ScheduleStatus extends AbstractRenderer
+{
+    /**
+     * @var \Magento\Framework\Mview\ViewInterface
+     */
+    protected $viewModel;
+
+    public function __construct(
+        \Magento\Backend\Block\Context $context,
+        View $viewModel,
+        array $data = []
+    ) {
+        parent::__construct($context, $data);
+        $this->viewModel = $viewModel;
+    }
+
+    /**
+     * Render indexer status
+     *
+     * @param \Magento\Framework\DataObject $row
+     * @return string
+     */
+    public function render(\Magento\Framework\DataObject $row)
+    {
+        try {
+            if (!$row->getIsScheduled()) {
+                return '';
+            }
+
+            try {
+                $view = $this->viewModel->load($row->getIndexerId());
+            } catch (\InvalidArgumentException $exception) {
+                // No view for this index.
+                return '';
+            }
+
+            $state = $view->getState()->loadByView($view->getId());
+            $changelog = $view->getChangelog()->setViewId($view->getId());
+            $currentVersionId = $changelog->getVersion();
+            $count = count($changelog->getList($state->getVersionId(), $currentVersionId));
+
+            if ($count > 1000) {
+                $class = 'grid-severity-critical';
+            } elseif ($count > 100) {
+                $class = 'grid-severity-major';
+            } elseif ($count > 10) {
+                $class = 'grid-severity-minor';
+            } else {
+                $class = 'grid-severity-notice';
+            }
+
+            if ($state->getStatus() !== 'idle') {
+                $class = 'grid-severity-minor';
+            }
+
+            $text = new Phrase(
+                "%status (%count in backlog)",
+                [
+                    'status' => $state->getStatus(),
+                    'count' => $count,
+                ]
+            );
+
+            return '<span class="' . $class . '"><span>' . $text . '</span></span>';
+        } catch (\Exception $exception) {
+            return '<span class="grid-severity-minor"><span>' .
+                htmlspecialchars(
+                    get_class($exception) . ': ' . $exception->getMessage()
+                ) . '</span></span>';
+        }
+    }
+}

app/code/Magento/Indexer/view/adminhtml/layout/indexer_indexer_list_grid.xml

@@ -76,6 +76,15 @@
                             <argument name="column_css_class" xsi:type="string">indexer-status</argument>
                         </arguments>
                     </block>
+                    <block class="Magento\Backend\Block\Widget\Grid\Column" name="adminhtml.indexer.grid.columnSet.indexer_schedule_status" as="indexer_schedule_status">
+                        <arguments>
+                            <argument name="header" xsi:type="string" translate="true">Schedule Status</argument>
+                            <argument name="index" xsi:type="string">schedule_status</argument>
+                            <argument name="renderer" xsi:type="string">Magento\Indexer\Block\Backend\Grid\Column\Renderer\ScheduleStatus</argument>
+                            <argument name="sortable" xsi:type="string">0</argument>
+                            <argument name="column_css_class" xsi:type="string">indexer-schedule-status</argument>
+                        </arguments>
+                    </block>
                     <block class="Magento\Backend\Block\Widget\Grid\Column" name="adminhtml.indexer.grid.columnSet.indexer_updated" as="indexer_updated">
                         <arguments>
                             <argument name="header" xsi:type="string" translate="true">Updated</argument>