A Jekyll plugin to compile Sass with Compass when building pages.

sass.rb

# -*- coding: utf-8 -*-
#
# Generates css files from Sass source files with Compass.
#
require 'pathname'
require 'sass'
require 'compass'

module Jekyll

  module Sass

    # Sass Static File# {{{
    class SassStaticFile < ::Jekyll::StaticFile

      # Initialize a new SassStaticFile.
      #
      # site   - The Site.
      # base   - The String path to the <source>.
      # dir    - The String path between <source> and the file.
      # name   - The String filename of the file.
      # syntax - The Symbol syntax of the file (:scss or :sass).
      def initialize(site, base, dir, name, syntax)
        super(site, base, dir, name)
        @syntax = syntax
      end

      # Obtain destination path.
      #
      # dest - The String path to the destination dir.
      def destination(dest)
        Pathname.new(super(dest)).sub_ext('.css').to_s
      end

      # Write the converted css file to the destination directory (if modified).
      #
      # dest - The String path to the destination dir.
      #
      # Returns false if the file was not modified since last time (no-op).
      def write(dest)
        dest_path = destination(dest)

        return false if File.exist?(dest_path) and !modified?
        @@mtimes[path] = mtime

        FileUtils.mkdir_p(File.dirname(dest_path))
        sass = ::Sass::Engine.new(
          File.read(path, encoding: 'UTF-8'),
          syntax: @syntax,
          load_paths: Compass.configuration.sass_load_paths)
        File.write(dest_path, sass.render, encoding: 'UTF-8')

        true
      end

    end
    # }}}

    # StaticFile class extension.# {{{
    class ::Jekyll::StaticFile

      # Returns whether the file is a sass source file.
      def sass_file?
        File.extname(@name) == '.sass' || File.extname(@name) == '.scss'
      end

      # Returns the Symbol syntax of sass source file (:sass or :scss).
      def sass_syntax
        File.extname(@name)[1 .. -1].to_sym
      end

      # Returns the SassStaticFile of this file.
      def to_sass
        return nil unless sass_file?

        SassStaticFile.new(@site, @base, @dir, @name, sass_syntax)
      end

    end
    # }}}

    # Sass CSS Generator# {{{
    class SassCssGenerator < ::Jekyll::Generator

      # Generate Sass CSS file.
      #
      # site - The Site.
      def generate(site)
        site.static_files.map! { |file| file.sass_file? ? file.to_sass : file}
      end

    end
    # }}}

  end

end

if __FILE__ == $0
  require 'minitest/autorun'
end

# vim: foldmethod=marker