download-nsscreencast.rb

# Using this script downloads ALL the videos in NSScreencast.
# Use it wisely, it's extra load/bandwidth for the NSScreencast website.
# Usage: `EMAIL=your email PASSWORD=your password END=how many videos should be downloaded? ruby download-nsscreencast.rb`

require "mechanize"
require "parallel"

mechanize = Mechanize.new
mechanize.post("https://www.nsscreencast.com/user_sessions", {"email" => ENV["EMAIL"], "password" => ENV["PASSWORD"]})
mechanize.pluggable_parser.default = Mechanize::Download

start_at = ENV["START"].to_i
end_at = ENV["END"].to_i
Parallel.each((start_at..end_at)) do |idx|
  begin
    video_url = "http://www.nsscreencast.com/episodes/#{idx}.mp4"
    puts "Downloading #{video_url}"

    video = mechanize.get(video_url)

    raw_filename = File.basename(video.uri.path)
    path = "videos/#{raw_filename}"
    
    video.save(path)
    puts "Saved #{video_url} as #{path}"
  rescue
    puts "Couldn't save #{video_url}"
  end
end