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download.py

#!/usr/env python

import urllib2
from HTMLParser import HTMLParser  
import os

def downloadFile(url, filename):

	u = urllib2.urlopen(url+'?format=txt')
	localFile = open(filename, 'w')
	localFile.write(u.read())
	localFile.close()

def createDirectory(dirname):
	if not os.path.exists(dirname):
		os.makedirs(dirname)


class Node:
	def __init__(self):
		self.isFile=0
		self.url=''
		self.name=''

class MyHTMLParser(HTMLParser):

  def __init__(self):
    HTMLParser.__init__(self)
    self.recording = 0 
    self.data = []
    self.node=Node()

  def handle_starttag(self, tag, attrs):
    if tag == 'a':
      for name, value in attrs:
        if name == 'title':
		if value == 'View Directory':
          		print name, value
          		print "Encountered the beginning of a %s tag" % tag 
          		self.recording = 1 
	  		self.node.isFile=0
        	elif value == 'View File':
          		print name, value
			print "Encountered the beginning of a %s tag" % tag 
			self.recording = 1 
			self.node.isFile=1
	if name == 'href':
		print "Encounter the href attr"
		print name,value
		self.node.url=value


  def handle_endtag(self, tag):
    if tag == 'a':
      self.recording = 0
      self.node=Node()
      print "Encountered the end of a %s tag" % tag 

  def handle_data(self, data):
    if self.recording:
      print 'title directory data: '+data
      self.node.name=data
      self.data.append(self.node)

def download(host,url,currDir):
	p= MyHTMLParser()
	f=urllib2.urlopen(url)
	html=f.read()
	p.feed(html)
	nodes = p.data
	p.close()
	for node in nodes:
		if node.isFile:
			print " download file " , node.name, " url:" ,node.url
			downloadFile(host+node.url, currDir+"/"+node.name)
		else:
			print " download directory " ,node.name ," url:",node.url
			directory=currDir+"/"+node.name
			createDirectory(directory)
			download(host,host+node.url,directory)

the script can download all files and directory which is powered by Trac browse source page.
Following is the sample:
python
import download
host='http://http://genshi.edgewall.org'
url='http://genshi.edgewall.org/browser'
curDir='./genshi'
download.download(host,url,curDir)