from __future__ import print_function
from sys import exit
import requests
from bs4 import BeautifulSoup

class Feeder:

    AUTH_URL = "https://www.google.com/accounts/ClientLogin"
    FEED_URL = "http://www.google.com/reader/atom/feed/"

    def __init__(self, email, passwd):
        """sets the auth header to be included in
        each subsequent request"""
        self.email = email
        self.passwd = passwd
        params = { "accountType": "GOOGLE",
                   "Email": self.email,
                   "Passwd": self.passwd,
                   "service": "reader",
                   "source": "thibaut"}
        r = requests.post(self.AUTH_URL, data=params)
        if r.status_code != requests.codes.ok:
            exit("Authentication failed")
        token = r.text.split("\n")[2].split("=")[1]
        self.headers = {"Authorization": "GoogleLogin auth={0}".format(token)}

    def feed(self, url):
        """generator which returns feed entries one by one."""
        r = requests.get(self.FEED_URL+url, headers=self.headers)
        soup = BeautifulSoup(r.text)
        for entry in soup("entry"):
            yield entry
        while soup.find("gr:continuation") is not None:
            params = {"c": soup.find("gr:continuation").string}
            r = requests.get(self.FEED_URL + url, params=params,
			     headers=self.headers)
            soup  = BeautifulSoup(r.text)
            for entry in soup("entry"):
                yield entry

if __name__ == "__main__":
    import sys
    try:
        feeder = Feeder(sys.argv[1], sys.argv[2])
    except IndexError:
        exit("Please provide email and password on the command line")
    for entry in feeder.feed("http://planetkde.org/rss20.xml"):
        print(entry.published.string, entry.title.string)