nws.py

"""
warnings.py -- NWS Alert Module
Copyright 2011, Michael Yanovich, yanovich.net

http://willie.dftba.net

This module allows one to query the National Weather Service for active
watches, warnings, and advisories that are present.
"""
from willie.module import commands, priority
import feedparser
import re
import urllib
import willie.web as web

states = {
    "alabama": "al",
    "alaska": "ak",
    "arizona": "az",
    "arkansas": "ar",
    "california": "ca",
    "colorado": "co",
    "connecticut": "ct",
    "delaware": "de",
    "florida": "fl",
    "georgia": "ga",
    "hawaii": "hi",
    "idaho": "id",
    "illinois": "il",
    "indiana": "in",
    "iowa": "ia",
    "kansas": "ks",
    "kentucky": "ky",
    "louisiana": "la",
    "maine": "me",
    "maryland": "md",
    "massachusetts": "ma",
    "michigan": "mi",
    "minnesota": "mn",
    "mississippi": "ms",
    "missouri": "mo",
    "montana": "mt",
    "nebraska": "ne",
    "nevada": "nv",
    "new hampshire": "nh",
    "new jersey": "nj",
    "new mexico": "nm",
    "new york": "ny",
    "north carolina": "nc",
    "north dakota": "nd",
    "ohio": "oh",
    "oklahoma": "ok",
    "oregon": "or",
    "pennsylvania": "pa",
    "rhode island": "ri",
    "south carolina": "sc",
    "south dakota": "sd",
    "tennessee": "tn",
    "texas": "tx",
    "utah": "ut",
    "vermont": "vt",
    "virginia": "va",
    "washington": "wa",
    "west virginia": "wv",
    "wisconsin": "wi",
    "wyoming": "wy",
}

county_list = "http://alerts.weather.gov/cap/{0}.php?x=3"
alerts = "http://alerts.weather.gov/cap/wwaatmget.php?x={0}"
zip_code_lookup = "http://www.zip-codes.com/zip-code/{0}/zip-code-{0}.asp"
nomsg = "There are no active watches, warnings or advisories, for {0}."
re_fips = re.compile(r'County FIPS:</a></td><td class="info">(\S+)</td></tr>')
re_state = re.compile(r'State:</a></td><td class="info"><a href="/state/\S\S.asp">\S\S \[(\S+(?: \S+)?)\]</a></td></tr>')
re_city = re.compile(r'City:</a></td><td class="info"><a href="/city/\S+.asp">(.*)</a></td></tr>')
more_info = "Complete weather watches, warnings, and advisories for {0}, available here: {1}"


@commands('nws')
@priority('high')
def nws_lookup(bot, trigger):
    """ Look up weather watches, warnings, and advisories. """
    text = trigger.group(2)
    if not text:
        return
    bits = text.split(",")
    master_url = False
    if len(bits) == 2:
        ## county given
        url_part1 = "http://alerts.weather.gov"
        state = bits[1].lstrip().rstrip().lower()
        county = bits[0].lstrip().rstrip().lower()
        if state not in states:
            bot.reply("State not found.")
            return
        url1 = county_list.format(states[state])
        page1 = web.get(url1).split("\n")
        for line in page1:
            mystr = ">" + unicode(county) + "<"
            if mystr in line.lower():
                url_part2 = line[9:36]
                break
        if not url_part2:
            bot.reply("Could not find county.")
            return
        master_url = url_part1 + url_part2
        location = text
    elif len(bits) == 1:
        ## zip code
        if bits[0]:
            urlz = zip_code_lookup.format(bits[0])
            pagez = web.get(urlz)
            fips = re_fips.findall(pagez)
            if fips:
                state = re_state.findall(pagez)
                city = re_city.findall(pagez)
                if not state and not city:
                    bot.reply("Could not match ZIP code to a state")
                    return
                state = state[0].lower()
                state = states[state].upper()
                location = city[0] + ", " + state
                fips_combo = unicode(state) + "C" + unicode(fips[0])
                master_url = alerts.format(fips_combo)
            else:
                bot.reply("ZIP code does not exist.")
                return

    if not master_url:
        bot.reply("Invalid input. Please enter a ZIP code or a county and state pairing, such as 'Franklin, Ohio'")
        return

    feed = feedparser.parse(master_url)
    warnings_dict = {}
    for item in feed.entries:
        if nomsg[:51] == item["title"]:
            bot.reply(nomsg.format(location))
            return
        else:
            warnings_dict[unicode(item["title"])] = unicode(item["summary"])

    paste_code = ""
    for alert in warnings_dict:
        paste_code += item["title"] + "\n" + item["summary"] + "\n\n"

    paste_dict = {
        "paste_private": 0,
        "paste_code": paste_code,
    }

    pastey = urllib.urlopen("http://pastebin.com/api_public.php",
        urllib.urlencode(paste_dict)).read()

    if len(warnings_dict) > 0:
        if trigger.sender.startswith('#'):
            i = 1
            for key in warnings_dict:
                if i > 1:
                    break
                bot.reply(key)
                bot.reply(warnings_dict[key][:510])
                i += 1
            bot.reply(more_info.format(location, master_url))
        else:
            for key in warnings_dict:
                bot.msg(trigger.nick, key)
                bot.msg(trigger.nick, warnings_dict[key])
            bot.msg(trigger.nick, more_info.format(location, master_url))

if __name__ == '__main__':
    print __doc__.strip()