Add JavaScript parser plugin

Gemfile

@@ -1,4 +1,8 @@
 source 'https://rubygems.org'
-gem 'github-pages', group: :jekyll_plugins
 gem "html-proofer"
 gem "jekyll"
+group :jekyll_plugins do
+  gem "github-pages"
+  gem "jekyll-seo-tag"
+  gem "ruby"
+end

_config.yml

@@ -2,3 +2,4 @@ theme: jekyll-theme-hacker
 google_analytics: UA-107410166-1
 plugins:
     - jekyll-seo-tag
+    - ruby

_plugins/convert_javascript.rb

@@ -0,0 +1,29 @@
+module Jekyll
+  class ConvertJS < Converter
+    safe true
+    priority :low
+
+    def matches(ext)
+      ext =~ /^\.js$/i
+    end
+
+    def output_ext(ext)
+      ".html"
+    end
+
+    def convert(content)
+#---
+#title: "First Drawing"
+#date: 2017-10-02
+#categories: update
+#---
+#
+#My first drawing...
+#
+#{% include 2017-10-02-first-drawing.js %}
+#
+#<a href="{{ site.baseurl }}/">Back...</a>
+      content
+    end
+  end
+end

_posts/2017-10-02-first-drawing.js

@@ -0,0 +1,2 @@
+rect(20, 20, 150, 100);
+stroke();