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": email,
                   "Passwd": passwd,
                   "service": "reader",
                   "source": "thibaut"}
        r = requests.post(self.AUTH_URL,
                          data=params)
        auth = r.text.split("\n")[2].split("=")[1]
        self.headers = {"Authorization": "GoogleLogin auth={}".format(auth)}

    def getFeed(self,url):
        """generator which returns feed entries one by one.
        it seems that google caps the n parameter to 1000 so
        we have to use the continuation parameter"""
        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
    feeder = Feeder(sys.argv[1], sys.argv[2])
    for entry in feeder.getFeed("http://planetkde.org/rss20.xml"):
        print entry.published.string, entry.title.string