It doesn't support any magical option of Signify (alignment, variable replacement). However, current lab feature has limitation to 96 chars in signature. This definitively sucks.
Published under the WTFPL.
import lxml.etree as et import sys import StringIO import codecs # DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE # Version 2, December 2004 # # Copyright (C) 2004 Sam Hocevar # 14 rue de Plaisance, 75014 Paris, France # Everyone is permitted to copy and distribute verbatim or modified # copies of this license document, and changing it is allowed as long # as the name is changed. # # DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE # TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION # # 0. You just DO WHAT THE FUCK YOU WANT TO. # take first command line parameter as input file f = codecs.open( sys.argv, "r", "utf-8" ) signs =  current_signature = "" preamble = """ <rss version="0.91"> <channel> <title>Signify converted signatures</title> <language>en-us</language> </channel> </rss> """ tree = et.parse(StringIO.StringIO(preamble)) channelNode = tree.xpath('/rss/channel') count = 0 for line in f: line = line.rstrip() if line.find("#") == 0: line = line # do nothing elif line.find('%') == 0: if len(current_signature) > 0: signs.append(current_signature) item = et.Element("item") title = et.Element("title") title.text = current_signature item.append(title) channelNode.append(item) count += 1 current_signature = "" else: current_signature += line + " " print et.tostring(tree, xml_declaration=True, encoding="utf-8")