From 22dd4a6d9cb0faa27950b880e462f64e7558be56 Mon Sep 17 00:00:00 2001
From: "E. S." <the@rootless.one>
Date: Sun, 18 May 2025 16:36:00 +0300
Subject: [PATCH] ic/tzo: fix chapter anchors

---
 src/lib/ic/TZOPart.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/lib/ic/TZOPart.php b/src/lib/ic/TZOPart.php
index 57a2501..32f0594 100644
--- a/src/lib/ic/TZOPart.php
+++ b/src/lib/ic/TZOPart.php
@@ -106,10 +106,11 @@ class TZOPart
 
         // chapter markers
         $html = preg_replace_callback(
-            '/<center>(?:# )?(\(\d+\)|([\w\s?]+))<\/center>/',
+            '/<center>(?:# )?(\((\d+)\)|([\w\s?]+))<\/center>/',
             function ($matches) {
                 $number = $matches[1];
-                return '<p class="tzo-chapter" id="chapter'.$number.'">'.$number.'</p>';
+                $id = isset($matches[2]) && $matches[2] != '' ? 'chapter'.$matches[2] : '';
+                return '<p class="tzo-chapter" id="'.$id.'">'.$number.'</p>';
             },
             $html
         );