Notify you if there is update of stocks in https://bandwagonhost.com/cart.php

bwg-wacher.py

# -*- coding: utf-8 -*-
import os
import time
import requests
from datetime import datetime
from pyquery import PyQuery as pq

URL = 'http://bwh1.net/cart.php'
GAP = 3600

def alert(title, msg):
    cmd = '''osascript -e 'display notification "%s" with title "%s"\'''' % (msg, title)
    return os.system(cmd)

def alert_diff(diff):
    item = sorted(diff)[0]
    return alert(item[0], item[1])

def parse_page(html):
    items = set()
    d = pq(html)
    divs = d('#order-web20cart .cartbox')

    for div in divs.items():
        item = []
        for td in div('td').items():
            texts = []
            for e in td.contents():
                if isinstance(e, str):
                    texts.append(e.strip())
                elif e.text:
                    texts.append(e.text.strip())
            item.append(tuple(filter(len, texts)))

        item[0] = item[0][0]
        item[1] = item[1][-1]
        item[2] = ' '.join(item[2])
        items.add(tuple(item))

    return items

def gen_diff():
    rr = [requests.get(URL), None]

    while True:
        print(datetime.now().strftime('%Y-%m-%d %H:%M:%S'))
        time.sleep(GAP)
        rr[-1] = requests.get(URL)
        rr.reverse()

        if all([r.status_code == 200 for r in rr]):
            items1 = parse_page(rr[0].text)
            items2 = parse_page(rr[1].text)
            diff = items1.difference(items2)

            print('v' * 120)
            for item in sorted(items1):
                print("%-60s\t%20s\t%s" % item)
            print('^' * 120)

            if len(diff):
                return diff
        else:
            msg = "fetch url failed!"
            print(msg)
            alert("ERROR", msg)

if __name__ == '__main__':
    diff = gen_diff()
    alert_diff(diff)