From 5c4b7c128471b2ea088592a2fd986f403ce65419 Mon Sep 17 00:00:00 2001
From: Shish <shish@shishnet.org>
Date: Fri, 16 Feb 2024 16:41:00 +0000
Subject: [PATCH] [post_tags] avoid DB call if not needed

---
 ext/post_tags/main.php | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/ext/post_tags/main.php b/ext/post_tags/main.php
index 86486663..452556ca 100644
--- a/ext/post_tags/main.php
+++ b/ext/post_tags/main.php
@@ -186,10 +186,14 @@ class PostTags extends Extension
 
     public function onParseLinkTemplate(ParseLinkTemplateEvent $event): void
     {
-        $tags = $event->image->get_tag_list();
-        $tags = str_replace("/", "", $tags);
-        $tags = ltrim($tags, ".");
-        $event->replace('$tags', $tags);
+        // get_tag_list can trigger a database query,
+        // so we only want to do it if we need to
+        if (str_contains($event->link, '$tags')) {
+            $tags = $event->image->get_tag_list();
+            $tags = str_replace("/", "", $tags);
+            $tags = ltrim($tags, ".");
+            $event->replace('$tags', $tags);
+        }
     }
 
     private function mass_tag_edit(string $search, string $replace, bool $commit): void