Parses the @WeatherCalgary twitter feed and uses the google chart API to create a png temperature graph

weather.rb

#!/usr/local/bin/ruby

require 'rubygems'
require 'uri'
require 'net/http'
require 'json' #3rd party
require 'time'

def weird_parse(weird)
  slices = weird.split /[\s]/
  day = slices[0]
  hour = slices[2]
  ind = Time::RFC2822_DAY_NAME.index day
  ind = -1 * (7 - ind) if ind > Time.now.wday
  puts ind
  time = Time.new
  time = Time.parse(hour)
  puts (Time.now.wday - ind) * 24 * 60 * 60
  time = time - (Time.now.wday - ind) * 24 * 60 * 60
  puts "Parsed [ #{weird} ] into [ #{time.to_s} ]"
  time
end

class DataPoint
  include Comparable
  attr_accessor :temp, :time, :time_txt
  
  def initialize(time_txt, temp, wind, humidity)
    @time = weird_parse time_txt
    @time_txt = time_txt
    @temp = temp
    @wind = wind
    @humidity = humidity
  end
  
  def <=>(other)
    if @time < other.time
      -1
    elsif other.time < @time
      1
    else
      0
    end
  end
  
  def eql?(other)
    @time == other.time
  end
  
  def hash
    @time.hash
  end
end

class Numeric
  def roundup(nearest=10)
    self % nearest == 0 ? self : self + nearest - (self % nearest)
  end
  def rounddown(nearest=10)
    self % nearest == 0 ? self : self - (self % nearest)
  end
end

class Array
  def every_nth(nth=2)
    elems = []
    self.each_with_index do |x, i|
      elems.push(x) if i % nth == 0
    end
    return elems
  end
end

uri = URI.parse('http://twitter.com/statuses/user_timeline/WeatherCalgary.json?count=100')
r = Net::HTTP.get_response(uri.host, uri.path + "?" + uri.query)
puts "#{r.code}\n"
json = JSON.parse r.body
puts "received #{json.length} tweets"
data = []
json.each do |s|
  slices = []
  slices.concat /\[([^\]]+)\] ([^|]+)/.match(s["text"]).captures
  s["text"].scan /\|([^|#]+)/ do |m|
    slices.concat m
  end
  time = Time.parse s["created_at"]
  time_txt = slices[0]
  condition = slices[1]
  temp = slices[2].split("/")[0].to_i
  wind = slices[3]
  humidity = slices[4]
  data.push DataPoint.new(time_txt, temp, wind, humidity)
end
data = data.uniq
puts "#{data.length} unique data points"
data = data.reverse
data = data.last 48
temps = data.map{ |x| x.temp }
times = data.map { |x| x.time_txt.gsub(/[\s]/, '%20') }
last = times.last
times = times.every_nth 4
times.push last
chart_req = "\
/chart?\
cht=lc\
&chs=1000x200\
&chtt=Weather\
&chd=t:#{temps.join(',')}\
&chxt=x,y\
&chxl=0:|#{times.join('|')}\
&chdl=Temperature\
&chma=10,10,10,10,10,10\
&chxtc=1,-1000|0,-200"

temps = temps.sort
min_temp = temps.first.rounddown 5
max_temp = temps.last.roundup 5
temp_spread = max_temp - min_temp

chart_req += "\
&chxr=1,#{min_temp},#{max_temp}\
&chds=#{min_temp},#{max_temp}"
puts chart_req
f = File.open "Temps.png", "wb"
f.write(Net::HTTP.get_response("chart.apis.google.com", chart_req).body)
f.close