When you have a whole LOT of ebooks to send to your Kindle

send_to_kindle.rb

#!/Usr/bin/env ruby

require 'mail'
require 'fileutils'


# Check if a command line argument is provided
if ARGV.length < 1
  puts "Usage: ruby send_to-kindle.rb <directory containing epub files>"
  exit 1
end

# Access the command line parameter, directory containing the files
# to be emailed to your Kindle
directory = File.expand_path(ARGV[0])
puts "The directory with epub's is: #{directory}"

# Email addresses to send the files to and from, specific to your
# desination Kindle. On Amazon, these account settings are found:
# Manage your Content & Devices | Preferences | Personal Document Settings
kindle_email = "your_kindle@kindle.com"
auth_email = 'your_authorized_email@example.com'

# Configure mail settings. See mail gem docs for alternativees to smtp
Mail.defaults do
  delivery_method :smtp, address: "mail.example.com", port: 25
end

# Iterate over each file in the directory
Dir.foreach(directory) do |file|
  next if file == '.' || file == '..'

  file_path = File.join(directory, file)

  if File.file?(file_path) && File.extname(file_path) == '.epub'
    # Get the file name
    filename = File.basename(file_path)

    # Send email with the file attached
    puts "Sending email for file: #{filename}"
    subject = "File: #{filename}"
    body = "Please add the attached file."

    # Sending email with attachment
    mail = Mail.new do
      to kindle_email
      from auth_email
      subject subject
      body body
      add_file file_path
    end

    mail.deliver

    puts "Email sent for file: #{filename}"
  end
end