Berdir · March 11, 2015 12:12 · Mar 11, 2015
diff --git a/gistfile1.php b/gistfile1.php
@@ -0,0 +1,57 @@
+<?php
+
+  /**
+   * Minifies and removes unneeded cache tags.
+   *
+   * @param array $cache_tags
+   *   List of cache tags.
+   *
+   * @return array
+   *   Shortened and cleaned up cache tag list.
+   */
+  public function minifyTags(array $cache_tags) {
+    $minified_tags = [];
+
+    $has_node_list_tag = in_array('node_list', $cache_tags);
+    $has_block_list_tag = in_array('config:block_list', $cache_tags);
+    $add_menu_list_tag = FALSE;
+
+    foreach ($cache_tags as $tag) {
+      // Skip specific node tags if the list cache tag is present.
+      if ($has_node_list_tag && strpos($tag, 'node:') !== FALSE) {
+        continue;
+      }
+
+      // Skip specific block cache tags if the list cache tag is present.
+      if ($has_block_list_tag && strpos($tag, 'config:block.block.') !== FALSE) {
+        continue;
+      }
+
+      // Skip specific node tags if the list cache tag is present.
+      if (strpos($tag, 'config:system.menu.') !== FALSE) {
+        $add_menu_list_tag = TRUE;
+        continue;
+      }
+
+      $minified_tags[] = $tag;
+    };
+
+    // @todo Replace this with a fancy algorithm.
+    $replacements = [
+      'config:' => 'c:',
+      'block_content:' => 'bc:',
+      'page_manager.page.' => 'pmp.',
+      'file:' => 'f:',
+      'taxonomy_term:' => 'tm:',
+      'theme_global_setting' => 'tgs',
+      'user:' => 'u:',
+    ];
+
+    // Shorten known cache tags.
+    $minified_tags = str_replace(array_keys($replacements), array_values($replacements), $minified_tags);
+
+    if ($add_menu_list_tag) {
+      $minified_tags[] = 'c:menu_list';
+    }
+    return $minified_tags;
+  }