attach-extract.rb

#!/opt/local/bin/ruby1.9
# -*- coding: utf-8 -*-

# based upon
# http://d.hatena.ne.jp/omochist/20060906/1157532315

require 'action_mailer'
require 'logger'

logger = Logger.new(STDERR)

ARGV.each do |fname|
  logger.debug "fname = #{fname}"

  email = TMail::Mail.load(fname)

  begin
    if email.has_attachments? 
      logger.debug 'attach detected.'
      email.attachments.each do |attachment|
        content = attachment.read
        filename = attachment.original_filename
        content_type = attachment.content_type
        logger.debug "filename = #{filename}, content-type = #{content_type}"

        File.open(filename, 'wb') {|f|
          f.write content
        }
      end
    end
  rescue
    next
  end
end