From 75b4f49c4aa598adba8e619bcf133f09dceea689 Mon Sep 17 00:00:00 2001
From: Almog Baku <almog.baku@gmail.com>
Date: Fri, 13 Mar 2020 16:03:05 +0200
Subject: [PATCH] Fix bug: AutoHeadingIDs being ignored

---
 html.go | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/html.go b/html.go
index 63b7435..7db102f 100644
--- a/html.go
+++ b/html.go
@@ -908,7 +908,10 @@ func (r *HTMLRenderer) writeTOC(w io.Writer, ast *Node) {
 		if node.Type == Heading && !node.HeadingData.IsTitleblock {
 			inHeading = entering
 			if entering {
-				node.HeadingID = fmt.Sprintf("toc_%d", headingCount)
+				if node.HeadingID == "" {
+					node.HeadingID = fmt.Sprintf("toc_%d", headingCount)
+					headingCount++
+				}
 				if node.Level == tocLevel {
 					buf.WriteString("</li>\n\n<li>")
 				} else if node.Level < tocLevel {
@@ -924,8 +927,7 @@ func (r *HTMLRenderer) writeTOC(w io.Writer, ast *Node) {
 					}
 				}
 
-				fmt.Fprintf(&buf, `<a href="#toc_%d">`, headingCount)
-				headingCount++
+				fmt.Fprintf(&buf, `<a href="#%s">`, node.HeadingID)
 			} else {
 				buf.WriteString("</a>")
 			}