Dirty wee Bitcoin cli ticker

btct

#!/usr/bin/env ruby

require 'rubygems'
require 'eventmachine'
require 'open-uri'
require 'json'

def fetch_ticker
  content = open("https://mtgox.com/api/1/BTCUSD/ticker").read
  result = JSON.parse(content)
  result['return']['last']
end

def colorize(text, color_code)
  "\e[#{color_code}m#{text}\e[0m"
end

def red(text); colorize(text, 31); end
def green(text); colorize(text, 32); end

EventMachine.run do
  current_value = nil
  previous_value = nil

  EventMachine.add_periodic_timer(5) do
    current = fetch_ticker
    current_value = current['value_int'].to_i 
    display = current['display']
    ticker = nil

    if previous_value
      if current_value < previous_value
        ticker = red display
      elsif current_value > previous_value
        ticker = green display
      end
    else
      ticker = display
    end

    puts "#{Time.now}: #{ticker}" if ticker
    previous_value = current_value
  end
end