DEV: Use yarn to manage Highlight.js dependency

Moves Highlight.js files to vendor/assets/javascripts

Adds Highlight.js in yarn package management

Removes old rake task and reliance on NPM to build Highlight.js

Highlight.js is now integrated in the "javascript:update" rake task

lib/tasks/highlight.rake

@@ -1,25 +0,0 @@
-desc "download latest version of highlight and prepare it"
-task "highlightjs:update" do
-
-  def run(cmd, opts = {})
-    puts cmd
-    system(cmd, opts.merge(out: $stdout, err: :out))
-  end
-  run("cd tmp && rm -fr highlight.js && git clone --depth 1 https://github.com/isagalaev/highlight.js.git")
-  run("cd tmp && rm -fr highlight_distrib && mkdir -p highlight_distrib/lang")
-  run("cd tmp/highlight.js && npm install")
-  run("cd tmp/highlight.js && node tools/build.js -t cdn none")
-
-  run("mv tmp/highlight.js/build/highlight.min.js tmp/highlight_distrib/highlight.js")
-
-  run("cd tmp/highlight.js && npm install && node tools/build.js -t cdn")
-
-  Dir.glob("tmp/highlight.js/build/languages/*.min.js") do |path|
-    lang = File.basename(path)[0..-8]
-    run("mv #{path} tmp/highlight_distrib/lang/#{lang}.js")
-  end
-
-  run("rm -fr lib/highlight_js/assets")
-  run("mv tmp/highlight_distrib lib/highlight_js/assets")
-
-end

lib/tasks/javascript.rake

@@ -44,6 +44,9 @@ task 'javascript:update' do
       source: 'handlebars/dist/handlebars.js'
     }, {
       source: 'handlebars/dist/handlebars.runtime.js'
+    }, {
+      source: 'highlight.js/build/.',
+      destination: 'highlightjs'
     }, {
       source: 'htmlparser/lib/htmlparser.js'
     }, {
@@ -82,6 +85,18 @@ task 'javascript:update' do
       filename = f[:destination]
     end
 
+    # Highlight.js needs building
+    if src.include? "highlight.js"
+      puts "Install Highlight.js dependencies"
+      system("cd node_modules/highlight.js && yarn install")
+
+      puts "Build Highlight.js"
+      system("cd node_modules/highlight.js && node tools/build.js -t cdn none")
+
+      puts "Cleanup unused styles folder"
+      system("rm -rf node_modules/highlight.js/build/styles")
+    end
+
     if f[:public]
       dest = "#{public_js}/#{filename}"
     else