Attribute presets

def save_preset
    t = Time.new
    file_name = sprintf("%04d-%02d-%02d_%02d%02d%02d", t.year, t.month, t.day, t.hour || 0, t.min || 0, t.sec || 0)
    File.open(File.join(preset_directory, file_name), "w") do |file|
        file.print YAML.dump [source_factories, @assigned_factories]
    end
    file_name
end
def next_preset
    directory = Dir.open(preset_directory)
    files = directory.entries[2..-1]
    @preset_index = @preset_index ? @preset_index + 1 : 0
    @preset_index = 0 if @preset_index > files.length - 1
    path = File.join(preset_directory, files[@preset_index])
    source_factories, @assigned_factories = YAML.load_file(path)
    path
end