A utility to download bookmarked items from pixiv

pixiv_bookmark_downloader.rb

#!/usr/bin/env ruby

#
# Usage:
#   export PIXIV_ID=<your pixiv ID>
#   export PIXIV_PASSWORD=<your pixiv password>
#   pixiv_bookmark_downloader.rb [download_dir]
#
# This script downloads your bookmarked items to
# <download_dir>/<member_id>/<image_name> (e.g. downloads/123/456.jpg)
#

require 'set'
require 'pixiv'

download_dir = ARGV[0] || 'downloads'

# Create a new client.
# You can configure agent (a Mechanize::HTTP::Agent)
# before logging in to pixiv.
pixiv = Pixiv.client(ENV['PIXIV_ID'], ENV['PIXIV_PASSWORD']) {|agent|
  agent.user_agent_alias = 'Mac Safari'
  #agent.set_proxy('127.0.0.1', 8080)
}

# Load or create a set to store ids of downloaded images.
seen = Marshal.load(open('seen.marshal')) rescue Set.new
at_exit do
  puts 'Saving seen illust ids'
  Marshal.dump(seen, open('seen.marshal', 'w'))
end

# Get the member object of logged-in user.
me = pixiv.member

puts "Start downloading bookmarks of #{ENV['PIXIV_ID']} (##{me.id})"

# Iterate over your bookmarks.
me.bookmarks.each do |illust|
  # Skip known images.
  if seen.include?(illust.id)
    puts "Skipping #{illust.title} (##{illust.id})"
    sleep 0.1
    next
  end

  print "Downloading #{illust.title} (##{illust.id}) ... "
  
  # Filename pattern:
  #   * :image_name is replaced with the name of the image
  #   * :member_id is replaced with the author's member id
  dl_filename_pattern = [download_dir, '/', :member_id, '/', :image_name]
  
  # Download images.
  begin
    if illust.manga?
      pixiv.download_manga(illust, dl_filename_pattern)
    else
      pixiv.download_illust(illust, dl_filename_pattern)
    end
    puts 'done'
    seen.add(illust.id)
    puts 'Waiting for 3 seconds'
    sleep 3
  rescue
    puts 'failed'
    puts "Error: #{$!.message}"
  end
end