Auto-purge feeds (just getting started); see wpsharks/comet-cache#182

quick-cache-pro/quick-cache-pro.inc.php

@@ -1455,6 +1455,7 @@ public function auto_purge_post_cache($id, $force = FALSE)
 				}
 				unset($_file); // Just a little housekeeping.
 
+				$counter += $this->auto_purge_xml_feeds_cache(); // If enabled and necessary.
 				$counter += $this->auto_purge_xml_sitemaps_cache(); // If enabled and necessary.
 				$counter += $this->auto_purge_home_page_cache(); // If enabled and necessary.
 				$counter += $this->auto_purge_posts_page_cache(); // If enabled and necessary.
@@ -1507,6 +1508,78 @@ public function auto_purge_post_cache_transition($new_status, $old_status, \WP_P
 				return apply_filters(__METHOD__, $counter, get_defined_vars());
 			}
 
+			/**
+			 * Automatically purges cache files related to XML feeds.
+			 *
+			 * @since 14xxxx Working to improve compatibility with feeds.
+			 *
+			 * @return integer Total files purged by this routine (if any).
+			 *
+			 * @throws \exception If a purge failure occurs.
+			 *
+			 * @note Unlike many of the other `auto_` methods, this one is NOT currently
+			 *    attached to any hooks. However, it is called upon by {@link auto_purge_post_cache()}.
+			 *
+			 * @see auto_purge_post_cache()
+			 */
+			public function auto_purge_xml_feeds_cache()
+			{
+				$counter          = 0; // Initialize.
+				$enqueued_notices = 0; // Initialize.
+
+				if(isset($this->cache[__FUNCTION__]))
+					return $counter; // Already did this.
+				$this->cache[__FUNCTION__] = -1;
+
+				if(!$this->options['enable'])
+					return $counter; // Nothing to do.
+
+				if(!$this->options['cache_purge_xml_sitemaps_enable'])
+					return $counter; // Nothing to do.
+
+				if(!$this->options['cache_purge_xml_sitemap_patterns'])
+					return $counter; // Nothing to do.
+
+				if(!is_dir($cache_dir = $this->cache_dir()))
+					return $counter; // Nothing to do.
+
+				$_this                        = $this; // Needed in the closure below.
+				$patterns                     = '(?:'.implode('|', array_map(function ($pattern) use ($_this)
+					{
+						$pattern = $_this->build_cache_path(home_url('/'.trim($pattern, '/')), '', '', // Convert to a cache path w/ possible wildcards.
+						                                    $_this::CACHE_PATH_ALLOW_WILDCARDS | $_this::CACHE_PATH_NO_SCHEME | $_this::CACHE_PATH_NO_HOST
+						                                    | $_this::CACHE_PATH_NO_PATH_INDEX | $_this::CACHE_PATH_NO_QUV | $_this::CACHE_PATH_NO_EXT);
+						return preg_replace('/\\\\\*/', '.*?', preg_quote($pattern, '/')); // Wildcards.
+
+					}, preg_split('/['."\r\n".']+/', $this->options['cache_purge_xml_sitemap_patterns'], NULL, PREG_SPLIT_NO_EMPTY))).')';
+				$cache_path_no_scheme_quv_ext = $this->build_cache_path(home_url('/'), '', '', $this::CACHE_PATH_NO_SCHEME | $this::CACHE_PATH_NO_PATH_INDEX | $this::CACHE_PATH_NO_QUV | $this::CACHE_PATH_NO_EXT);
+				$regex                        = '/^'.preg_quote($cache_dir, '/'). // Consider all schemes; all path paginations; and all possible variations.
+				                                '\/[^\/]+\/'.preg_quote($cache_path_no_scheme_quv_ext, '/').
+				                                '\/'.$patterns.'\./';
+
+				/** @var $_file \RecursiveDirectoryIterator For IDEs. */
+				foreach($this->dir_regex_iteration($cache_dir, $regex) as $_file) if($_file->isFile() || $_file->isLink())
+				{
+					if(strpos($_file->getSubpathname(), '/') === FALSE) continue;
+					// Don't delete files in the immediate directory; e.g. `qc-advanced-cache` or `.htaccess`, etc.
+					// Actual `http|https/...` cache files are nested. Files in the immediate directory are for other purposes.
+
+					if(!unlink($_file->getPathname())) // Throw exception if unable to delete.
+						throw new \exception(sprintf(__('Unable to auto-purge XML sitemap file: `%1$s`.', $this->text_domain), $_file->getPathname()));
+					$counter++; // Increment counter for each file purge.
+
+					if($enqueued_notices || !$this->options['change_notifications_enable'] || !is_admin())
+						continue; // Stop here; we already issued a notice, or this notice is N/A.
+
+					$this->enqueue_notice('<img src="'.esc_attr($this->url('/client-s/images/clear.png')).'" style="float:left; margin:0 10px 0 0; border:0;" />'.
+					                      __('<strong>Quick Cache:</strong> detected changes. Found XML sitemaps (auto-purging).', $this->text_domain));
+					$enqueued_notices++; // Notice counter.
+				}
+				unset($_file); // Just a little housekeeping.
+
+				return apply_filters(__METHOD__, $counter, get_defined_vars());
+			}
+
 			/**
 			 * Automatically purges cache files related to XML sitemaps.
 			 *