#! /usr/bin/env python2.7
import sys
from lxml import etree
import urllib2

if len(sys.argv) < 2:
	print "argument please"
	sys.exit(1)

debug = (len(sys.argv) == 3)

node =	sys.argv[1]

xml =	sys.stdin.read()
rss =	etree.fromstring(xml)
items =	rss.xpath('//item')

#comment below to keep too-long feeds (like BBC)
del items[30:]

for item in items:
	title =	item.findtext('title')
	link = 	item.findtext('link')
	desc =	item.xpath('description')[0]
	
	if debug:
		print title
		print link
	
	try:
		data =	urllib2.urlopen(link).read()
		html =	etree.HTML(data)
		match =	html.xpath(node)
		
		if len(match):
			text =	etree.tostring(match[0])
		
			if debug:
				print text
			
			desc.text = text
		else:
			if debug:
				print "no match"
		
	except urllib2.HTTPError, error:
    		if debug:
    			print "error"

if len(sys.argv) == 2:
	print etree.tostring(rss)