We all love working with Sass, but compilation can take quite a long time for larger codebases. This gem integrates the C implementation of Sass, LibSass, into the asset pipeline.
In one larger project, this made compilation 4x faster:
# Using sassc-rails
[1] pry(main)> Benchmark.bm { |bm| bm.report { Rails.application.assets["application.css"] } }
user system total real
1.720000 0.170000 1.890000 ( 1.936867)
# Using sass-rails
[1] pry(main)> Benchmark.bm { |bm| bm.report { Rails.application.assets["application.css"] } }
user system total real
7.820000 0.250000 8.070000 ( 8.106347)
This should essentially be a drop in alternative to sass-rails.
Inline Source Maps
With SassC-Rails, it's also extremely easy to turn on inline source maps. Simply add the following configuration to your development.rb file:
# config/environments/development.rb
config.sass.inline_source_maps = true
After adding this config line, you may need to clear your assets cache
(rm -r tmp/cache/assets
), stop spring, and restart your rails server. You may
also wish to disable line comments (config.sass.line_comments = false
).
Note, as indicated, these source maps are inline. They will not generate additional files or anything like that. Instead, they will be appended to the compiled application.css file.
LibSass Compatibility With Ruby Sass
For a look at the compatibility between Ruby Sass and LibSass, check this compatibility chart out.
Installation
Add this line to your application's Gemfile:
gem 'sassc-rails'
And then execute:
$ bundle
Common Issues
Deployment to Heroku
Due to LibSass compilation requirements, you must upgrade to the Heroku Cedar-14 Stack in order to successfully install this gem.
Upgrading to Cedar-14 is usually a painless process.
Installing alongside a gem that depends on Sass-Rails
Libraries explicitly depending on Sass-Rails, such as ActiveAdmin, can cause conflicts with installation of SassC-Rails. While we have no built-in solution for this, please check out this issue for a workaround.
Credits
This gem is based on sass-rails, and is maintained by Ryan Boland and awesome contributors.
Changelog
- 2.1.2
- 2.1.1
- 2.1.0
- 2.0.0
- 1.3.0
- 1.2.1
- Bump SassC (and thus LibSass) version
- 1.2.0
- 1.1.0
- Moved under the official sass organization!
- Source line comments (
app.config.sass.line_comments
) - Prevent sass-rails railtie from running
- CSS compression may be disabled in test mode. Special thanks to this Sass-Rails PR for inspiration.
- 1.0.0
- Initial Release
- Add support for inline source maps
- Support compression in the way that Sass-Rails handles it
Contributing
- Fork it ( https://github.com/sass/sassc-rails/fork )
- Create your feature branch (
git checkout -b my-new-feature
) - Commit your changes (
git commit -am 'Add some feature'
) - Add Tests
- Push to the branch (
git push origin my-new-feature
) - Create a new Pull Request