# rssdir.py
# a at foo dot be - Alexandre Dulaunoy - http://www.foo.be/cgi-bin/wiki.pl/RssAny
#
# rssdir is a simply-and-dirty script to rssify any directory on the filesystem.
# 
# an example of use on the current directory :
#
# python2.5 /usr/local/bin/rssdir.py --prefix http://www.foo.be/cours/ . >rss.xml
#
# Don't really need python2.5 except for ElementTree but you are free to install it.

import os, fnmatch
import time
import sys
import xml.etree.ElementTree as ET
from optparse import OptionParser

version = "0.1"

# recursive list file function from the ASPN cookbook
def all_files(root, patterns='*', single_level=False, yield_folders=False):
        patterns = patterns.split(';')
        for path, subdirs, files in os.walk(root):
                if yield_folders:
                        files.extend(subdirs)
                files.sort()
                for name in files:
                        for pattern in patterns:
                                if fnmatch.fnmatch(name, pattern):
                                        yield os.path.join(path, name)
                                        break
                if single_level:
                        break

def date_files(filelist):
	date_filename_list = []

        for filename in filelist:
                stats = os.stat(filename)
                last_update = stats[8]
		date_filename_tuple = last_update, filename
		date_filename_list.append(date_filename_tuple)

	return date_filename_list

def date_as_rfc(value):
	return time.strftime("%a, %d %b %Y %H:%M:%S +0000", time.localtime(value))


def build_rss(myitem,maxitem):

	RSSroot = ET.Element( 'rss', {'version':'2.0'} )
	RSSchannel = ET.SubElement( RSSroot, 'channel' )

	ET.SubElement( RSSchannel, 'title' ).text = 'RSS feed of ' + str(title)
	ET.SubElement( RSSchannel, 'link' ).text = link
	ET.SubElement( RSSchannel, 'description' ).text = 'A directory RSSified by rssdir.py ' + version
	ET.SubElement( RSSchannel, 'generator' ).text = 'A directory RSSified by rssdir.py ' + version
	ET.SubElement( RSSchannel, 'pubDate' ).text = date_as_rfc(time.time())

	for bloodyitem in myitem[0:maxitem]:

		RSSitem = ET.SubElement ( RSSchannel, 'item' )
		ET.SubElement( RSSitem, 'title' ).text = bloodyitem[1]
		ET.SubElement( RSSitem, 'pubDate' ).text = date_as_rfc(bloodyitem[0])
		ET.SubElement( RSSitem, 'description').text = prefixurl+bloodyitem[1]
		ET.SubElement( RSSitem, 'guid').text = prefixurl+bloodyitem[1]
		
	RSSfeed = ET.ElementTree(RSSroot)
	feed = ET.tostring(RSSroot)
	return feed


def complete_feed(myfeed):

	myheader = '<?xml version="1.0"?>'
	return myheader + str(myfeed)


usage = "usage: %prog [options] directory"
parser = OptionParser(usage)

parser.add_option("-p","--prefix",dest="prefix",help="http prefix to be used for each entry, default none")
parser.add_option("-t","--title",dest="title",help="set a title to the rss feed, default using prefix",type="string")
parser.add_option("-l","--link",dest="link",help="http link set, default is prefix and none if prefix not set")
parser.add_option("-m","--maxitem",dest="maxitem",help="maximum item to list in the feed, default 32",type="int")

(options, args) = parser.parse_args()

if options.prefix is None:
	prefixurl = ''
else :
        prefixurl = options.prefix

if options.link is None:
	link = options.prefix
else :
        link = options.link

if options.title is None:
	title = options.prefix
else :
	title = options.title

if options.maxitem is None:
	maxitem = 32
else :
	maxitem = options.maxitem


mylist = date_files(all_files(args[0]))

mylist.sort()
mylist.reverse()

print complete_feed(build_rss(mylist,maxitem))