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|
# Weather plugin for rbot
#
# NOAA National Weather Service support by MrChucho (mrchucho@mrchucho.net)
# Copyright (C) 2006 Ralph M. Churchill
#
# Weather Undeground support by Giuseppe "Oblomov" Bilotta <giuseppe.bilotta@gmail.com>
# Copyright (C) 2006 Giuseppe Bilotta
require 'uri'
require 'rexml/document'
# Wraps NOAA National Weather Service information
class CurrentConditions
def initialize(station)
@station = station
@url = "http://www.nws.noaa.gov/data/current_obs/#{@station.upcase}.xml"
@etag = String.new
@mtime = Time.mktime(0)
@current_conditions = String.new
@iscached = false
end
def update
begin
open(@url,"If-Modified-Since" => @mtime.rfc2822) do |feed|
# open(@url,"If-None-Match"=>@etag) do |feed|
@etag = feed.meta['etag']
@mtime = feed.last_modified
cc_doc = (REXML::Document.new feed).root
@iscached = false
@current_conditions = parse(cc_doc)
end
rescue OpenURI::HTTPError => e
case e
when /304/:
@iscached = true
when /404/:
raise "Data for #{@station} not found"
else
raise "Error retrieving data: #{e}"
end
end
@current_conditions # +" Cached? "+ ((@iscached) ? "Y" : "N")
end
def parse(cc_doc)
cc = Hash.new
cc_doc.elements.each do |c|
cc[c.name.to_sym] = c.text
end
"At #{cc[:observation_time_rfc822]}, the wind was #{cc[:wind_string]} at #{cc[:location]} (#{cc[:station_id]}). The temperature was #{cc[:temperature_string]}#{heat_index_or_wind_chill(cc)}, and the pressure was #{cc[:pressure_string]}. The relative humidity was #{cc[:relative_humidity]}%. Current conditions are #{cc[:weather]} with #{cc[:visibility_mi]}mi visibility."
end
private
def heat_index_or_wind_chill(cc)
hi = cc[:heat_index_string]
wc = cc[:windchill_string]
if hi != 'NA' then
" with a heat index of #{hi}"
elsif wc != 'NA' then
" with a windchill of #{wc}"
else
""
end
end
end
class WeatherPlugin < Plugin
def help(plugin, topic="")
case topic
when "nws"
"weather nws <station> => display the current conditions at the location specified by the NOAA National Weather Service station code <station> ( lookup your station code at http://www.nws.noaa.gov/data/current_obs/ )"
when "station", "wu"
"weather <location> => display the current conditions at the location specified, looking it up on the Weather Underground site; you can use 'station <code>' to look up data by station code ( lookup your station code at http://www.weatherunderground.com/ )"
else
"weather information lookup. Looks up weather information for the last location you specified. See topics 'nws' and 'wu' for more information"
end
end
def initialize
super
@nws_cache = Hash.new
@wu_url="http://mobile.wunderground.com/cgi-bin/findweather/getForecast?brand=mobile&query=%s"
@wu_station_url="http://mobile.wunderground.com/global/stations/%s.html"
end
def weather(m, params)
loc = nil
service = nil
if params[:where].empty?
if @registry.has_key?(m.sourcenick)
where = @registry[m.sourcenick]
debug "Loaded weather info #{where.inspect} for #{m.sourcenick}"
save = false
else
debug "No weather info for #{m.sourcenick}"
m.reply "I don't know where you are yet, #{m.sourcenick}. See 'help weather nws' or 'help weather wu' for additional help"
return
end
else
where = params[:where]
save = true
unless ['nws','station'].include?(where.first)
loc = where.to_s
service = :wu
end
end
unless service
loc = where[1].to_s
service = where.first.to_sym
end
if loc.empty?
debug "No weather location found for #{m.sourcenick}"
m.reply "I don't know where you are yet, #{m.sourcenick}. See 'help weather nws' or 'help weather wu' for additional help"
end
case service
when :nws
nws_describe(m, loc)
when :station
wu_station(m, loc)
when :wu
wu_weather(m, loc)
end
@registry[m.sourcenick] = [service, loc] if save
end
def nws_describe(m, where)
if @nws_cache.has_key?(where) then
met = @nws_cache[where]
else
met = CurrentConditions.new(where)
end
if met
begin
m.reply met.update
@nws_cache[where] = met
rescue => e
m.reply e.message
end
else
m.reply "couldn't find weather data for #{where}"
end
end
def wu_station(m, where)
begin
xml = @bot.httputil.get_cached(@wu_station_url % URI.escape(where))
case xml
when nil
m.reply "couldn't retrieve weather information, sorry"
return
when /<table border.*?>(.*?)<\/table>/m
data = $1
m.reply wu_weather_filter(data)
else
debug xml
m.reply "something went wrong with the data for #{where}..."
end
rescue => e
m.reply "retrieving info about '#{where}' failed (#{e})"
end
end
def wu_weather(m, where)
begin
xml = @bot.httputil.get_cached(@wu_url % URI.escape(where))
case xml
when nil
m.reply "couldn't retrieve weather information, sorry"
return
when /City Not Found/
m.reply "no such location found (#{where})"
return
when /<table border.*?>(.*?)<\/table>/m
data = $1
m.reply wu_weather_filter(data)
when /<a href="\/global\/stations\//
stations = xml.scan(/<a href="\/global\/stations\/(.*?)\.html">/)
m.reply "multiple stations available, use 'weather station <code>' where code is one of " + stations.join(", ")
else
debug xml
m.reply "something went wrong with the data from #{where}..."
end
rescue => e
m.reply "retrieving info about '#{where}' failed (#{e})"
end
end
def wu_weather_filter(stuff)
txt = stuff
txt.gsub!(/[\n\s]+/,' ')
data = Hash.new
txt.gsub!(/ /, ' ')
txt.gsub!(/°/, ' ') # degree sign
txt.gsub!(/<\/?b>/,'')
txt.gsub!(/<\/?span[^<>]*?>/,'')
txt.gsub!(/<img\s*[^<>]*?>/,'')
txt.gsub!(/<br\s?\/?>/,'')
result = Array.new
if txt.match(/<\/a>\s*Updated:\s*(.*?)\s*Observed at\s*(.*?)\s*<\/td>/)
result << ("Weather info for %s (updated on %s)" % [$2, $1])
end
txt.scan(/<tr>\s*<td>\s*(.*?)\s*<\/td>\s*<td>\s*(.*?)\s*<\/td>\s*<\/tr>/) { |k, v|
unless v.empty? or v == "-" or k =="Raw METAR"
result << ("%s: %s" % [k, v])
end
}
return result.join('; ')
end
end
plugin = WeatherPlugin.new
plugin.map 'weather *where', :defaults => {:where => false}
|
