From 441c68b8d73d36eece221e3d34c4ce967a3c551a Mon Sep 17 00:00:00 2001
From: Jason Zimdars <jz@37signals.com>
Date: Thu, 30 Jan 2025 15:20:40 -0600
Subject: [PATCH] Add `data-turbo-frame` attribute to links in comments

---
 config/initializers/sanitization.rb |  1 +
 lib/markdown_renderer.rb            | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/config/initializers/sanitization.rb b/config/initializers/sanitization.rb
index 8b602bcb4..a4e712142 100644
--- a/config/initializers/sanitization.rb
+++ b/config/initializers/sanitization.rb
@@ -1,3 +1,4 @@
 Rails.application.config.after_initialize do
   Rails::HTML5::SafeListSanitizer.allowed_tags.merge(%w[ s table tr td th thead tbody details summary ])
+  Rails::HTML5::SafeListSanitizer.allowed_attributes.merge(%w[ data-turbo-frame ])
 end
diff --git a/lib/markdown_renderer.rb b/lib/markdown_renderer.rb
index 6f466434c..df9070bd5 100644
--- a/lib/markdown_renderer.rb
+++ b/lib/markdown_renderer.rb
@@ -36,9 +36,28 @@ class MarkdownRenderer < Redcarpet::Render::HTML
     block_code(code, language) # call Rouge Redcarpet plugin
   end
 
+  def link(url, title, content)
+    attributes = { href: url }
+    attributes[:title] = title if title
+    attributes["data-turbo-frame"] = "_top"
+
+    "<a #{html_attributes(attributes)}>#{content}</a>"
+  end
+
+  def autolink(url, link_type)
+    attributes = { href: url }
+    attributes["data-turbo-frame"] = "_top"
+
+    "<a #{html_attributes(attributes)}>#{url}</a>"
+  end
+
   private
     attr_reader :id_counts
 
+    def html_attributes(attributes)
+      attributes.map { |key, value| %Q(#{key}="#{value}") }.join(" ")
+    end
+
     def unique_id(text)
       text.parameterize.then do |base_id|
         id_counts[base_id] += 1