Changed to use cache bust plugin (#3436)

Signed-off-by: George Araújo <george.gcac@gmail.com>

Gemfile

@@ -6,6 +6,7 @@ gem 'jekyll'
 group :jekyll_plugins do
     gem 'jekyll-3rd-party-libraries'
     gem 'jekyll-archives-v2'
+    gem 'jekyll-cache-bust'
     gem 'jekyll-email-protect'
     gem 'jekyll-feed'
     gem 'jekyll-get-json'

Gemfile.lock

@@ -144,6 +144,8 @@ GEM
     jekyll-archives-v2 (0.0.6)
       activesupport
       jekyll (>= 3.6, < 5.0)
+    jekyll-cache-bust (0.0.1)
+      jekyll (>= 3.6, < 5.0)
     jekyll-email-protect (1.1.0)
     jekyll-feed (0.17.0)
       jekyll (>= 3.7, < 5.0)
@@ -299,6 +301,7 @@ DEPENDENCIES
   jekyll
   jekyll-3rd-party-libraries
   jekyll-archives-v2
+  jekyll-cache-bust
   jekyll-email-protect
   jekyll-feed
   jekyll-get-json

_config.yml

@@ -212,6 +212,7 @@ keep_files:
 plugins:
   - jekyll-3rd-party-libraries
   - jekyll-archives-v2
+  - jekyll-cache-bust
   - jekyll-email-protect
   - jekyll-feed
   - jekyll-get-json

_plugins/cache-bust.rb

@@ -1,51 +0,0 @@
-# based on https://distresssignal.org/busting-css-cache-with-jekyll-md5-hash
-# https://gist.github.com/BryanSchuetz/2ee8c115096d7dd98f294362f6a667db
-module Jekyll
-  module CacheBust
-    class CacheDigester
-      require 'digest/md5'
-      require 'pathname'
-
-      attr_accessor :file_name, :directory
-
-      def initialize(file_name:, directory: nil)
-        self.file_name = file_name
-        self.directory = directory
-      end
-
-      def digest!
-        [file_name, '?', Digest::MD5.hexdigest(file_contents)].join
-      end
-
-      private
-
-      def directory_files_content
-        target_path = File.join(directory, '**', '*')
-        Dir[target_path].map{|f| File.read(f) unless File.directory?(f) }.join
-      end
-
-      def file_content
-        local_file_name = file_name.slice((file_name.index('assets/')..-1))
-        File.read(local_file_name)
-      end
-
-      def file_contents
-        is_directory? ? file_content : directory_files_content
-      end
-
-      def is_directory?
-        directory.nil?
-      end
-    end
-
-    def bust_file_cache(file_name)
-      CacheDigester.new(file_name: file_name, directory: nil).digest!
-    end
-
-    def bust_css_cache(file_name)
-      CacheDigester.new(file_name: file_name, directory: 'assets/_sass').digest!
-    end
-  end
-end
-
-Liquid::Template.register_filter(Jekyll::CacheBust)