config.rb

# Require any additional compass plugins here.
require 'autoprefixer-rails'

# Set this to the root of your project when deployed:
http_path = "/"
css_dir = "stylesheets"
sass_dir = "stylesheets/scss"
images_dir = "images"
javascripts_dir = "js"

# You can select your preferred output style here (can be overridden via the command line):
output_style = :compressed
# :expanded, :nested, :compact, or :compressed

# To enable relative paths to assets via compass helper functions. Uncomment:
relative_assets = true

# To disable debugging comments that display the original location of your selectors. Uncomment:
#line_comments = false

# If you prefer the indented syntax, you might want to regenerate this
# project again passing --syntax sass, or you can uncomment this:
# preferred_syntax = :sass
# and then run:
# sass-convert -R --from scss --to sass sass scss && rm -rf sass && mv scss sass

# Autoprefixer
on_stylesheet_saved do |file|
  css = File.read(file)
  File.open(file, 'w') do |io|
    io << AutoprefixerRails.process(css)
  end
end