working on redownloading my gutenberg epub file to mobi files

epub_to_mobi_gutenberg.rb

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-

`find "/Users/freakhill/Dropbox/アプリ/gutenberg" -name "*.epub"`.split("\n").each do |f|
  File.basename(f) =~ /^(.*)\.epub$/
  title = $1
  if File.exists? File.join(File.dirname(f), "#{title}.mobi")
    puts "skipping #{$1}"
    next
  end
  puts "process #{$1}? (push enter)"
  STDIN.readline
  `curl --silent "http://www.gutenberg.org/ebooks/search/?query=#{title}" | grep -E '\"/ebooks/[[:digit:]]+'`.split("\n").each do |l|
    l =~ /href="([^"]*)"/
    puts "process #{$1}?"
    case STDIN.readline
    when /n/i # next, go to the next entry
      puts "skipping to next entry for that query"
      next
    when /s/i # skip, go to the next book
      puts "skipping to next epub book"
      break
    end
    /href="([^"]*)"/.match(`curl --silent "http://www.gutenberg.org#{$1}" | grep -E "/send/dropbox.+kindle\.images"`) do |m|
      `open "http://www.gutenberg.org#{m[1]}"`
    end
  end
end