# encoding: utf-8

module Nanoc::Filters
  class Sass < Nanoc::Filter
    requires 'sass', 'nanoc/filters/sass/sass_filesystem_importer'

    # Runs the content through [Sass](http://sass-lang.com/).
    # Parameters passed to this filter will be passed on to Sass.
    #
    # @param [String] content The content to filter
    #
    # @return [String] The filtered content
    def run(content, params = {})
      options = params.merge({
        nanoc_current_filter: self,
        filename: @item && @item.raw_filename,
      })
      engine = ::Sass::Engine.new(content, options)
      engine.render
    end

    def imported_filename_to_item(filename)
      @items.find do |i|
        i.raw_filename &&
          Pathname.new(i.raw_filename).realpath == Pathname.new(filename).realpath
      end
    end
  end
end