My Auto-minification code for JS templates on Rails!

development.rb

#on "config/environments/development.rb"

#fixes display:inline-block positioning problems with whitespaced HTML
#reduces JS template filesize

#introduces a convention to use //= require_tree ./templates/compiled on application.coffee
#requires listen gem v2 + htmlcompressor
Rails.application.configure do
  #development.rb defaults...
  
  
  config.after_initialize do

    def create_compiled_js_template(item)
      unless File.directory?(item) #necessary for the dir.glob at start
        rel_path = item.sub("#{root}/app/assets/javascripts/templates/", "")
        compile_dir = "#{root}/app/assets/javascripts/templates/compiled/#{rel_path}"
        dirname = File.dirname(compile_dir)
        unless File.directory?(dirname)
          FileUtils.mkdir_p(dirname)
        end
        compressor = HtmlCompressor::Compressor.new(:remove_intertag_spaces => true)
        new_file = compressor.compress(File.read(item))
        IO.write(compile_dir, new_file)
        puts "Template compiled"
      end
    end

    Dir.glob("#{Rails.root}/app/assets/javascripts/templates/**/*") do |item|
      unless item.scan("compiled")[0] #means its compiled dir
        create_compiled_js_template(item)
      end
    end

    #ONLY BUG: IT DOESN'T DELETE DIRECTORIES + FILES ON START
    #+ DOESN'T DELETE DIR WHILE IT RUNS
    listener = Listen.to("app/assets/javascripts/templates", ignore: %r{^(?: compiled )(/|$)}x) do |modified, added, removed|
      if modified[0]
        puts "MODIFIED - #{modified[0]}"
        create_compiled_js_template(modified[0])
      elsif added[0]
        puts "ADDED - #{added[0]}"
        create_compiled_js_template(added[0])
      elsif removed[0]
        puts "DELETED - #{removed[0]}"
        rel_path = removed[0].sub("#{root}/app/assets/javascripts/templates/", "")
        File.delete("#{root}/app/assets/javascripts/templates/compiled/#{rel_path}")
        puts "Compiled template removed"
      end
    end

    listener.start
  end
end