Nanoc plugin that flattens fireworks pngs

sips_flatten.rb

# Sips Flatten Filter for nanoc 2.1.1
# 
# Uses the 'sips' command line tool in Mac OS X to flatten Fireworks images
# Quick hack, use at your own risk. Don't blame us if it destroys your carefully
# crafted images

module Nanoc::BinaryFilters

  class SipsFlattenFilter < Nanoc::BinaryFilter

    identifier :sips_flatten

    def run(file)
      # Get temporary file path
      tmp_file = Tempfile.new("sips_filter")

      flatten_format = @asset_rep.flatten_format || "png"

      %x(sips -s format #{flatten_format} #{file.path} --out "#{tmp_file.path}">&/dev/null)

      tmp_file
    end
  end

end