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

def log(str):
	if (len(sys.argv) == 3):
		print str

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

node =	sys.argv[1]

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

cache = expanduser("~") + "/.cache/morss"
if not os.path.exists(cache):
    os.makedirs(cache)

for item in items:
	title =	item.findtext('title')
	link = 	item.findtext('link')
	desc =	item.xpath('description')[0]
	
	log(title)
	log(link)
	
	cached = cache + "/" + str(hash(link))
	
	if os.path.exists(cached):
		log("cached")
		desc.text = open(cached, 'r').read()
	else:
		try:
			data =	urllib2.urlopen(link).read()
			html =	etree.HTML(data)
			match =	html.xpath(node)
		
			if len(match):
				text =	etree.tostring(match[0])
				log("ok txt")
				desc.text = text
				open(cached, 'w').write(text)
			else:
				log("no match")
		
		except urllib2.HTTPError, error:
	    		log("error")

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