Check asset encoding for valid UTF-8; if not valid, show compatible encodings

assets.rake

namespace :assets do
  
  task  :check => :environment do
    paths = ["app/assets", "lib/assets", "vendor/assets"]
    
    paths.each do |path|
      dir_path = Rails.root + path
      
      if File.exists?(dir_path)
        dir_files = File.join(dir_path, "**")
        
        Dir.glob(dir_files + "/**.{js,css}").each do |file|
        
            # make sure we're not trying to process a directory
            unless File.directory?(file)
              # read the file and check its encoding
              data = File.read(file)              
              unless data.valid_encoding?
                puts "#{ file } does not have valid encoding!"
                encodings = []
                for enc in Encoding.name_list
                  if data.dup.force_encoding(enc).valid_encoding?
                    encodings << enc
                  end
                end
                puts "    (it could be one of #{encodings})" unless encodings.empty?
              end
            end
        
        end # end Dir.glob
        
      end #end File.exists
    end # end paths.each
    
  end
  
end