image downloader

imgdl.rb

# coding: utf-8
require 'open-uri'

if ARGV.empty? and $stdin.stat.zero?
  $stdout.print(<<-EOL)
usage:
  ruby #{__FILE__} url_include.text
  ruby #{__FILE__} http://hato.2ch.net/akb/dat/1320063456.dat
  ruby #{__FILE__} < url_include.text
  EOL
  exit
end

candidate_pattern = %r{(ttp://(:?\S*?)\.(:?jpe?g|gif|png))}

downloader = lambda do |io|
  io.each_line do |line|
    line.scan(candidate_pattern).each do |uri|
      candidate = 'h' + uri.first
      open(candidate){|rf| open(File.basename(candidate), 'wb+'){|lf| lf.write(rf.read) } } rescue $stderr.puts(candidate, $!)
      $stdout.puts candidate
      sleep 0.5
    end
  end
end

ARGV.each do |resource|
  downloader[open(resource)]
end

downloader[$stdin] unless $stdin.stat.zero?