lose_it_yearly_export.rb

require 'active_support'
require 'active_support/time'
require 'active_support/core_ext'
require 'net/http'
require 'mechanize'

a = Mechanize.new { |agent| agent.user_agent_alias = 'Mac Safari' }
a.get('http://www.loseit.com') do |p|
  login = a.click(p.link_with(:text => "Sign In"))

  logged_in_page = login.form_with(:action => "/") do |f|
    f.username = "email@example.com"
    f.password = "omgsekrit"
  end.click_button

  date = Time.now
  start = date - 1.year - 3.months

  ## NB: /export expects its timestamps to be Unix epochs multiplied by 1000
  while date >= start do
    puts "Downloading #{date.iso8601}..."
    a.download "http://www.loseit.com/export/weekly?date=#{date.to_i * 1000}", "#{date.iso8601}.csv"
    date = date - 1.week
  end
end