Pull all of a friends Facebook posts

pull_posts.rb

require 'json'
require 'watir'
require 'seconds'

if ARGS.empty?
  warn 'Please provide the Facebook user number and query string that will appear in every post (first name usually works)' 
  exit
end

b = Watir::Browser.new
b.goto 'https://www.facebook.com/'
b.driver.execute_script( "alert('Please log in')" ) rescue nil

Watir::Wait.until { b.title['Log In'].nil? }
FileUtils.mkdir ARGS.last

(0..Float::INFINITY).each do |n|
  month = (Time.now - n.months).strftime '%Y-%m'
  warn "Pulling #{month} ..."
  query = {
    q: ARGS.last,
    filters_rp_author: {
      name: "author",
      args: ARGS.first
    }.to_json,
    filters_rp_creation_time: {
      name: "creation_time",
      args: {
        start_month: month,
        end_month: month
      }.to_json
    }.to_json
  }

  b.goto "https://www.facebook.com/search/top/?#{URI.encode_www_form(query)}"
  
  break if b.div(text: /We couldn't find anything for/).exists?
  
  until b.div(text: 'End of Results').exists?
    b.divs(text: 'See more').select(&:visible?).map(&:click) rescue nil
    b.driver.execute_script( "window.scrollBy(0,document.body.scrollHeight)" ) rescue nil
  end
  
  File.open(File.join(ARGS.last, month), 'w') do |file|
    b.divs("data-testid" => "results").each do |div|
      file.puts div.text
    end
  end
end