Initial commit of archive_tree module

src/Plugin/Block/ArchiveTreeBlock.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace Drupal\archive_tree\Plugin\Block;
+
+use Drupal\Core\Block\BlockBase;
+
+/**
+ * Provides an 'Archive tree' block.
+ *
+ * @Block(
+ *   id = "archive_tree_block",
+ *   admin_label = @Translation("Archive tree"),
+ * )
+ */
+class ArchiveTreeBlock extends BlockBase {
+  /**
+   * {@inheritdoc}
+   */
+  public function build() {
+    $storage = \Drupal::entityTypeManager()->getStorage('node');
+    $query = $storage->getQuery()
+      ->condition('type', 'article')
+      ->condition('status', 1)
+      ->sort('created', 'DESC')
+      ->accessCheck(TRUE)
+      ->addTag('DANGEROUS_ACCESS_CHECK_OPT_OUT');
+    $nids = $query->execute();
+    $nodes = $storage->loadMultiple($nids);
+
+    $tree = [];
+    foreach ($nodes as $node) {
+      $created = $node->getCreatedTime();
+      $year = date('Y', $created);
+      $month = date('m', $created);
+      if (!isset($tree[$year])) {
+        $tree[$year] = ['count' => 0, 'months' => []];
+      }
+      if (!isset($tree[$year]['months'][$month])) {
+        $tree[$year]['months'][$month] = 0;
+      }
+      $tree[$year]['count']++;
+      $tree[$year]['months'][$month]++;
+    }
+
+    krsort($tree); // Descending years
+    foreach ($tree as &$data) {
+      krsort($data['months']); // Descending months
+    }
+
+    $output = '';
+    foreach ($tree as $year => $data) {
+      $year_url = '/archive-tree/' . $year;
+      $output .= '<details><summary class="archive-tree-year">';
+      $output .= '<a href="' . $year_url . '">' . $year . '</a> (' . $data['count'] . ')';
+      $output .= '</summary>';
+      foreach ($data['months'] as $month => $count) {
+        $month_url = '/archive-tree/' . $year . '/' . $month;
+        $output .= '<div class="archive-tree-month">';
+        $output .= '<a href="' . $month_url . '">' . $month . '</a> (' . $count . ')';
+        $output .= '</div>';
+      }
+      $output .= '</details>';
+    }
+
+    return [
+      '#markup' => $output,
+      '#allowed_tags' => ['details', 'summary', 'a', 'div'],
+      '#attached' => [
+        'library' => [
+          'archive_tree/archive_tree_styles',
+        ],
+      ],
+    ];
+  }
+}