GetUbumaga.rb

## Download the pdf files of Ubuntu Magazine Japanese vol.3
## (URL http://ubuntu.asciimw.jp/elem/000/000/010/10231/)
require 'open-uri'

BASE_URL = 'http://ubuntu.asciimw.jp/elem/000/000/010/10231/'
PDF_URL_REG = /href="(koukai\/.+?.pdf)"/
OUT_DIR = 'ubumaga_vol3'

html_body = ''
open(BASE_URL, 'r') { |f| html_body = f.read }
puts "#{BASE_URL} >> DOWNLOADED."
Dir::mkdir(OUT_DIR) unless File.exist?(OUT_DIR)
html_body.scan(PDF_URL_REG).flatten.each { |pdf_url|
  filename = File.basename(pdf_url)
  pdf = nil
  print "[#{BASE_URL + pdf_url}] START >> "
  open(BASE_URL + pdf_url, 'rb') { |f| pdf = f.read }
  print "DOWNLOADED >> "
  open(OUT_DIR + '/' + filename, 'wb') { |f| f.write pdf }
  puts "DONE."
}