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Armen138

Member

From: Laval, Quebec

Registered: 2011-04-23

Posts: 12

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cli weather script(for canada)

Hi there!
I wrote a little Ruby script to show the weather conditions or forecast on the commandline.
The script is short, so I'll just post it here in its entirety.

#!/usr/bin/ruby

require 'net/http'
require 'uri'
require 'cgi'
USERAGENT = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.1) Gecko/20060111 Firefox/1.5.0.1' #just in case the server is allergic to scripts

class Weather
    def initialize
        @http = Net::HTTP.new('www.weatheroffice.gc.ca', 80)
    end
    def currentConditions
        resp, data = @http.get2('/rss/city/qc-147_e.xml', {'User-Agent' => USERAGENT}) #this is the XML for Laval, Quebec.
        if(data =~ /title\>Current\sConditions:.*?\<description\>(.*?)\]\]\>\<\/description/m)
            cc = CGI.unescapeHTML($1).gsub(/\<.*?\>/,"")
            cc = cc.gsub(/:/, ":\033[32m")        #insert ANSI characters to turn this text green
            cc = cc.gsub(/\n/, "\033[0m\n")        #end green text
            cc = cc.gsub(/\&\#xB0\;/, "°" ) #replace HTML escape codes. use 176.chr for non-unicode terminals
            cc = cc.gsub(/\&deg\;/, "°" )    #idem
            puts cc
        end
    end
    def forecast(day)
        resp, data = @http.get2('/rss/city/qc-147_e.xml', {'User-Agent' => USERAGENT}) #this is the XML for Laval, Quebec.
        if(data =~ /title\>#{day}:.*?\<description\>(.*?)\<\/description/im)
            cc = CGI.unescapeHTML($1).gsub(/\<.*?\>/,"")
            cc = cc.gsub(/Forecast/, "\nForecast")        #timestamp on next line
            puts cc
        end
    end
end

weather = Weather.new()
if(ARGV.size() > 0)
    weather.forecast(ARGV[0])
else
    weather.currentConditions
end

this will work for cities in Canada. Change the string "/rss/city/qc-147_e.xml" to match the xml for your city (go to http://www.weatheroffice.gc.ca, select your city and find the rss/xml link)

Output will typically be something like this:

armen@dusk:~$ weather
Observed at: Montr�al-Trudeau Int'l Airport 10:00 PM EDT Monday 30 May 2011 
Condition: Clear 
Temperature: 19.4°C 
Pressure / Tendency: 102.0 kPa rising
Visibility: 24.1 km
Humidity: 63 %
Dewpoint: 12.1°C 
Wind: W 8 km/h
Air Quality Health Index:  
armen@dusk:~$ weather friday
Sunny. Low 11. High 22. 
Forecast issued 3:45 PM EDT Monday 30 May 2011