Download all PragPub issues from Pragmatic Programmers

prag_pub.rb

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

require 'open-uri'

VALID_FORMATS = ['pdf', 'html', 'mobi', 'epub']

format = ARGV[0] || 'pdf'

unless VALID_FORMATS.include?(format)
  puts "Invalid format. Please use: #{VALID_FORMATS.join(',')} (default: pdf)"
  exit(1) 
end

system('mkdir -p prag_pub')

1.upto(31).each do |issue_no|
  file_name = "#{issue_no}.#{format}"

  puts "downloading issue #{file_name}"

  File.open("prag_pub/#{file_name}", "wb") do |saved_file|
    open("http://pragprog.com/magazines/download/#{file_name}", 'rb') do |input|
      saved_file.write(input.read)
    end
  end
end