天気予報を取得するスクリプト

weather.rb

#!/usr/bin/env/ruby
# encoding : utf-8

require 'open-uri'
require 'json'

CACHE = "/tmp/weather.rb.cache"

if File.exist?(CACHE) && (Time.now - File::Stat.new(CACHE).mtime) <= 1800
    print File.read(CACHE)
      exit
end

begin
  uri = URI.parse('http://api.wunderground.com/api/Your_Key/conditions/lang:JP/q/Japan/Okinawa.json')
  json_string = uri.read('r:binary').encode("UTF-8", invalid: :replace, undef: :replace)
  parsed_json = JSON.parse(json_string)
  conditions = parsed_json['current_observation']
rescue Exception => ex
  error_no = ex.message.split("\s").first
  open(CACHE, 'w'){|io| io.print error_no}
  print error_no
  exit
end

weather = conditions['weather']
temp_c = conditions['temp_c']
wind_dir = conditions['wind_dir']
wind_kph = conditions['wind_kph']
message = [weather, temp_c, 'C', wind_dir, wind_kph , 'km/h'].join(' ')

if message.nil?
    File.delete CACHE
    print 'err'
else
    open(CACHE, 'w'){|io| io.print message}
    print message
end