posterous_test.rb

  desc "modulate <theme> <hue> <saturation> <lightness>", "Modulate a theme. Specify h, s, l as floats, eg: 1.5"
    def modulate(theme, hue, saturation, lightness)
      ExtJS::Theme.each_image {|img|
        path = img.filename.split('/')
        filename = path.pop
        dir = path.pop
        say_status("modulate", File.join(dir, filename))
        ExtJS::Theme.write_image(img.modulate(lightness.to_f, saturation.to_f, hue.to_f), File.join(ExtJS::Theme["theme_dir"], theme))
      }
      gsub_file(File.join(ExtJS::Theme["theme_dir"], theme, "defines.sass"), /\$hue:\s?(.*)/, "$hue: #{(hue.to_f-1)*180}")
    end