From 24578306b73f7016b75e7ea42a16f705f1539a17 Mon Sep 17 00:00:00 2001
From: Ryan Cramer <ryan@processwire.com>
Date: Wed, 12 May 2021 09:43:57 -0400
Subject: [PATCH] Add feature requested in PR #136 - Allow modification of
 CacheFile string before output

Co-authored-by: ethanbeyer <ethan.beyer@gmail.com>
---
 wire/modules/PageRender.module | 27 ++++++++++++++++++++++++---
 1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/wire/modules/PageRender.module b/wire/modules/PageRender.module
index 55b9f978..395db84f 100644
--- a/wire/modules/PageRender.module
+++ b/wire/modules/PageRender.module
@@ -11,8 +11,9 @@
  * https://processwire.com
  * 
  * @method renderPage(HookEvent $event)
- * @method clearCacheFileAll(Page $page)
- * @method clearCacheFilePages(PageArray $items, Page $page)
+ * @method void clearCacheFileAll(Page $page)
+ * @method void clearCacheFilePages(PageArray $items, Page $page)
+ * @method string saveCacheFileReady(Page $page, $data)
  *
  */
 
@@ -327,6 +328,22 @@ class PageRender extends WireData implements Module, ConfigurableModule {
 		}
 	}
 
+	/**
+	 * Hook called when cache file is about to be saved for a Page
+	 *
+	 * #pw-hooker
+	 *
+	 * @param Page $page
+	 * @param string $data Data that will be saved to cache file
+	 * @return string Data to save to cache file
+	 * @since 3.0.178
+	 *
+	 */
+	public function ___saveCacheFileReady(Page $page, $data) {
+		if($page) {} // ignore
+		return $data;
+	}
+
 	/**
 	 * Hook called before any other hooks to Page::render
 	 * 
@@ -547,7 +564,11 @@ class PageRender extends WireData implements Module, ConfigurableModule {
 			}
 		}
 
-		if($data && $cacheAllowed && $cacheFile) $cacheFile->save($data);
+		if($data && $cacheAllowed && $cacheFile) {
+			$data = $this->saveCacheFileReady($page, $data);
+			$cacheFile->save($data);
+		}
+		
 		$event->return = $data; 
 
 		if(!$of) $page->of($of);