markdown: use commonmarker as markdown processor

Author: thimy

Gemfile

@@ -43,3 +43,5 @@ gem "bridgetown-svg-inliner", "~> 2.0"
 gem "bridgetown-sitemap", "~> 2.0"
 
 gem "bridgetown-seo-tag", "~> 6.0"
+
+gem "commonmarker"

Gemfile.lock

@@ -54,6 +54,7 @@ GEM
       bridgetown (>= 1.2.0, < 2.0)
       nokogiri
     colorator (1.1.0)
+    commonmarker (0.23.10)
     concurrent-ruby (1.2.2)
     erubi (1.12.0)
     faraday (2.7.10)
@@ -121,6 +122,7 @@ DEPENDENCIES
   bridgetown-seo-tag (~> 6.0)
   bridgetown-sitemap (~> 2.0)
   bridgetown-svg-inliner (~> 2.0)
+  commonmarker
   puma (< 7)
 
 BUNDLED WITH

bridgetown.config.yml

@@ -50,7 +50,4 @@ collections:
     output: true
     future: true
 
-kramdown:
-  parse_html_blocks: true
-
-markdown: CustomMarkdownConverter
+markdown: Commonmarker

plugins/bridgetown/converters/markdown/commonmarker.rb

@@ -0,0 +1,14 @@
+class Bridgetown::Converters::Markdown::Commonmarker
+  def initialize(config)
+    require "commonmarker"
+    @config = config
+  rescue LoadError
+    STDERR.puts 'You are missing a library required for Markdown. Please run:'
+    STDERR.puts '  $ [sudo] gem install commonmarker'
+    raise RuntimeError.new("Missing dependency: commonmarker")
+  end
+
+  def convert(content)
+    CommonMarker.render_html(content)
+  end
+end