Refactor Rakefile

Rakefile

@@ -1,21 +1,38 @@
 require 'html-proofer'
+require 'jekyll'
 
-desc 'Clean up generated site'
+Rake.application.options.trace = true
+
+desc 'Remove all generated files: destination folder, metadata file, Sass and Jekyll caches.'
 task :clean do
-  sh 'rm -rf _site'
+  Jekyll::Commands::Clean.process({})
+end
+
+desc 'Build and serve the site'
+task serve: [:build] do
+  Jekyll::Commands::Serve.process({})
+end
+
+desc 'Build the site'
+task build: [:clean] do
+  Jekyll::Commands::Build.process({})
 end
 
-task :test do
-  sh 'bundle exec jekyll build'
-  HTMLProofer.check_directories(
-    ["./_site"], {
-      :empty_alt_ignore => false,
-      typhoeus: {
-        headers: {
-          "Accept-Encoding" => "gzip",
-        }
+desc 'Build and test the site'
+task test: [:build] do
+  options = {
+    :check_html => true, # Validate HTML
+    :empty_alt_ignore => false, # Allow images with empty alt tags
+    :check_favicon => true, # Check whether favicons are valid
+    :check_img_http => true, # Enforce that images use HTTPS
+    typhoeus: {
+      headers: {
+        # This is required to validate links to docs.github.com
+        "Accept-Encoding" => "gzip",
       }
-    }).run
+    }
+  }
+  HTMLProofer.check_directory("./_site", options).run
 end
 
 task default: :test