From 10d7696e40f956f890a6ab063475ab0b9e1a40b1 Mon Sep 17 00:00:00 2001
From: Alex Kotov <git@kotovalexarian.com>
Date: Fri, 18 Oct 2024 16:09:41 +0400
Subject: [PATCH] Double separators for chapter anchors

---
 examples/full.chapters.json    | 2 +-
 examples/full.html             | 6 +++---
 lib/repubmark/elems/chapter.rb | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/examples/full.chapters.json b/examples/full.chapters.json
index 44ea17e..5c45ec9 100644
--- a/examples/full.chapters.json
+++ b/examples/full.chapters.json
@@ -11,7 +11,7 @@
     "title": "Chapter 2",
     "chapters": [
       {
-        "slug": "2-nested",
+        "slug": "2--nested",
         "title": "Chapter 2.1",
         "chapters": [
 
diff --git a/examples/full.html b/examples/full.html
index 321e136..1588730 100644
--- a/examples/full.html
+++ b/examples/full.html
@@ -63,19 +63,19 @@ The Rty
 </div>
 </div>
 </div>
-<h2 id="chapter-1-юникод">Chapter 1</h2>
+<h2 id="chapter--1-юникод">Chapter 1</h2>
 <p>
 <span>
 Chapter 1 paragraph text
 </span>
 </p>
-<h2 id="chapter-2">Chapter 2</h2>
+<h2 id="chapter--2">Chapter 2</h2>
 <p>
 <span>
 Chapter 2 paragraph text
 </span>
 </p>
-<h3 id="chapter-2-nested">Chapter 2.1</h3>
+<h3 id="chapter--2--nested">Chapter 2.1</h3>
 <p>
 <span>
 Chapter 2.1 paragraph text
diff --git a/lib/repubmark/elems/chapter.rb b/lib/repubmark/elems/chapter.rb
index ccd4bab..03f5bb7 100644
--- a/lib/repubmark/elems/chapter.rb
+++ b/lib/repubmark/elems/chapter.rb
@@ -66,11 +66,11 @@ module Repubmark
 
       def anchor
         if parent.instance_of?(self.class) && @level > 2
-          "#{parent.anchor}-#@slug"
+          "#{parent.anchor}--#@slug"
         elsif anchor_prefix.empty?
           @slug
         else
-          "#{anchor_prefix}-#@slug"
+          "#{anchor_prefix}--#@slug"
         end.freeze
       end