Nanoc `sassc` filter

README.md

A Nanoc filter for compiling Sass stylesheets with the sassc gem.

Rules.rb

#!/usr/bin/env ruby

ignore '/**/_*.scss'
ignore '/**/_*.scss', rep: :source_map

compile '/**/*.scss' do
  filter :sassc
  write ext: '.css'
end

compile '/**/*.scss', rep: :source_map do
  filter :sassc_source_map
  write ext: '.css.map'
end

sassc_filter.rb

require 'sassc'

module Nanoc::Filters
  module SassCCommon
    def render(content, params = {})
      dir = File.dirname(@item.raw_filename)

      options = params.merge(
        load_paths: [dir],
        filename: @item.raw_filename,
        cache: false
      )

      source_map_rep = @item.reps[:source_map]
      unless source_map_rep.nil?
        options[:source_map_file] = File.join(dir, File.basename(source_map_rep.path))
        options[:source_map_contents] = true
      end

      engine = ::SassC::Engine.new(content, options)
      css = engine.render

      dependencies = engine.dependencies
      if dependencies.any?
        depend_on(
          @items.to_h {|item| [item.raw_filename, item]}
                .fetch_values(*dependencies.map(&:filename))
        )
      end

      [css, engine.source_map]
    end
  end

  class SassCFilter < Nanoc::Filter
    identifier :sassc

    include SassCCommon

    def run(content, params = {})
      css, _ = render(content, params)
      css
    end
  end

  class SassCSourceMapFilter < Nanoc::Filter
    identifier :sassc_source_map

    include SassCCommon

    def run(content, params = {})
      _, source_map = render(content, params)
      source_map
    end
  end
end