Tasks for previewing the purge work

Author: David Heinemeier Hansson

lib/tasks/tailwindcss_tasks.rake

@@ -3,4 +3,14 @@ namespace :tailwindcss do
   task :install do
     system "#{RbConfig.ruby} ./bin/rails app:template LOCATION=#{File.expand_path("../install/tailwindcss.rb", __dir__)}"
   end
+
+  task :keeping_class_names do
+    puts Tailwindcss::Purger.extract_class_names_from(Rails.root.glob("app/views/**/*.*") + Rails.root.glob("app/helpers/**/*.rb"))
+  end
+
+  task :preview_purge do
+    puts Tailwindcss::Purger.purge \
+      Pathname.new(__FILE__).join("../../../app/assets/stylesheets/tailwind.css").read,
+      keeping_class_names_from_files: Rails.root.glob("app/views/**/*.*") + Rails.root.glob("app/helpers/**/*.rb")
+  end
 end