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Better Sass integration with Sprockets 2.x

When using Sprockets 2.x with Sass you will eventually run into a pretty big issue. //= require directives will not allow Sass mixins, variables, etc. to be shared between files. So you’ll try to use @import, and that’ll also blow up in your face. sprockets-sass fixes all of this by creating a Sass::Importer that is Sprockets aware.

Note: This works in Rails 3.1, thanks to the sass-rails gem. But if you want to use Sprockets and Sass anywhere else, like Sinatra, use sprockets-sass


  • Imports Sass _partials_ (filenames prepended with _).
  • Import paths work exactly like require directives.
  • Imports either Sass syntax, or just regular CSS files.
  • Imported files are preprocessed by Sprockets, so .css.scss.erb files can be imported. Directives from within imported files also work as expected.
  • Automatic integration with Compass.
  • Supports glob imports, like sass-rails.
  • Asset path Sass functions. New in 0.4!


bash $ gem install sprockets-sass


In your Rack application, setup Sprockets as you normally would, and require “sprockets-sass”:

``` ruby require “sprockets” require “sprockets-sass” require “sass”

map “/assets” do environment = Sprockets::Environment.new environment.append_path “assets/stylesheets” run environment end

map “/” do run YourRackApp end ```

Sprockets Sass provides also a compressor for .css files

You can use it with Sprockets 2.x by doing this:

ruby environment = Sprockets::Environment.new environment.css_compressor = Sprockets::Sass::V2::Compressor

Or with Sprockets 3.x by doing this:

ruby environment = Sprockets::Environment.new environment.css_compressor = :sprockets_sass

Or with Rails by setting css_compressor in the config/application.rb file to one of the values listed above depending on your version of Sprockets

Now @import works essentially just like a require directive, but with one essential bonus: Sass mixins, variables, etc. work as expected.

Given the following Sass partials:

scss // assets/stylesheets/_mixins.scss @mixin border-radius($radius) { -webkit-border-radius: $radius; -moz-border-radius: $radius; border-radius: $radius; }

scss // assets/stylesheets/_settings.scss $color: red;

In another file - you can now do this - from within a Sprockets asset:

``` scss // assets/stylesheets/application.css.scss @import “mixins”; @import “settings”;

button { @include border-radius(5px); color: $color; } ```

And GET /assets/application.css would return something like:

css button { -webkit-border-radius: 5px; -moz-border-radius: 5px; border-radius: 5px; color: red; }

Passing Options to the Sass Engine

If you would like to configure any of the Sass options, you can do so like this:

ruby Sprockets::Sass.options[:line_comments] = true

Compass Integration

As of version 0.3.0, Compass is automatically detected and integrated. All you have to do is configure Compass like you normally would:

``` ruby require “sprockets” require “sprockets-sass” require “sass” require “compass”

Compass.configuration do |compass| # … end

map “/assets” do environment = Sprockets::Environment.new environment.append_path “assets/stylesheets” run environment end



The load paths and other options from Compass are automatically used:

``` scss // assets/stylesheets/application.css.scss @import “compass/css3”;

button { @include border-radius(5px); } ```

Asset Path Sass Functions

As of version 0.4.0, asset path helpers have been added. In order to use them you must add sprockets-helpers to your Gemfile:

ruby gem "sprockets-sass", "~> 0.5" gem "sprockets-helpers", "~> 0.2" # etc...

Here’s a quick guide to setting up sprockets-helpers in your application (look at the project’s README for more information):

``` ruby require “sprockets” require “sprockets-sass” require “sprockets-helpers” require “sass”

map “/assets” do environment = Sprockets::Environment.new environment.append_path “assets/stylesheets”

Sprockets::Helpers.configure do |config| config.environment = environment config.prefix = “/assets” config.digest = false end

run environment end



The Sass functions are based on the ones in sass-rails. So there is a -path and -url version of each helper:

scss background: url(asset-path("logo.jpg")); // background: url("/assets/logo.jpg"); background: asset-url("logo.jpg"); // background: url("/assets/logo.jpg");

The API of the functions mimics the helpers provided by sprockets-helpers, using Sass keyword arguments as options:

scss background: asset-url("logo.jpg", $digest: true); // background: url("/assets/logo-27a8f1f96afd8d4c67a59eb9447f45bd.jpg"); background: asset-url("logo", $prefix: "/themes", $ext: "jpg"); // background: url("/themes/logo.jpg");

As of version 0.6.0, #asset_data_uri has been added, which creates a data URI for the given asset:

scss background: asset-data-uri("image.jpg"); // background: url(data:image/jpeg;base64,...);


Install dependencies using bundler:

bash bundle install

sprocket-sass is tested against numerous versions of Sass, Compoass, and Sprockets using appraisal. This will install all the gems and run the tests against all versions Run tests:

bash bundle exec rake

Copyright (c) 2011 Peter Browne. See LICENSE for details.