Use Padrino and sprockets with sprockets-helpers

module Padrino::Sprockets
  def self.registered(base)
    base.set :sprockets, ::Sprockets::Environment.new(Padrino.root)
 
    # Add folder
    base.sprockets.append_path 'assets/javascripts'
    base.sprockets.append_path 'assets/stylesheets'
    base.sprockets.append_path 'assets/images'
    base.set :digest_assets, true
 
    # compress file
    if PADRINO_ENV == 'development'
      base.sprockets.js_compressor = Uglifier.new(mangle: true)
      base.sprockets.css_compressor = YUI::CssCompressor.new
    end
 
    # sprockets-helpers
    base.helpers Sprockets::Helpers
    # We can configure \`sprockets-helpers\` to find the correct assets for us.
    Sprockets::Helpers.configure do |config|
      manifest_path      = File.join(Padrino.root,'public','assets','manifest.json')
      config.environment = base.sprockets
      config.prefix      = '/assets'
      config.manifest    = Sprockets::Manifest.new(base.sprockets, manifest_path)
      config.digest      = true
      config.public\_path = base.public\_folder
    end
 
    # call sprockets :D
    if PADRINO_ENV == 'development'
      base.get '/assets/*splat' do
        env\['PATH_INFO'\].gsub!(%r{A/?assets}, '')
        settings.sprockets.call(env)
      end
    end
  end
end

In this file you need add all your asset's folder.. 2) Load this file at startup application: **config/boot.rb**

\# after this line
Bundler.require(:default, PADRINO_ENV)
 
\# add this
require Padrino.root('config/sprockets')

1) register Padrino::Sprockets in your application

Module Foo
  class App < Padrino::Application
   register Padrino::Sprockets
 
  end
end

4) Use js,css sprockets version in you layout, es: **layout.slim**

link href= stylesheet_path('app') media="screen" type="text/css" rel="stylesheet"

instead

= stylesheet\_link\_tag :app

5) Use Rakefile to create asstes to pre-compilation :D:D

PADRINO\_ENV  = ENV\['PADRINO\_ENV'\] ||= ENV\['RACK\_ENV'\] ||= 'development'  unless defined?(PADRINO\_ENV)
 
require 'bundler/setup'
require 'padrino-core/cli/rake'
 
 
require 'sprockets/../rake/sprocketstask'
 
 Bundler.require(PADRINO_ENV)
require File.expand\_path("../config/boot.rb", \_\_FILE__)
 
PadrinoTasks.use(:database)
PadrinoTasks.use(:minirecord)
PadrinoTasks.init
 
\# Use fake application 
module FakeSprock
  class App < Padrino::Application
    register Padrino::Sprockets
  end
end
 
SPROCKETS = FakeSprock::App.sprockets
 
\# or your real app name
\# SPROCKETS = RealAppName::App.sprockets
 
Rake::SprocketsTask.new do |t|
  manifest_path = File.join(Padrino.root,'public','assets')
  t.environment = SPROCKETS
  t.output      = File.join(Padrino.root,'public','assets')
  t.manifest    = Sprockets::Manifest.new(SPROCKETS, manifest_path)
  t.assets      = %w\[app.js app.css *.png *.gif *.jpg\]
end