topsellers.rb

# -*- coding: utf-8 -*-
require 'amazon/ecs'

BROWSE_NODE = {
  "apparel"            => "361245011",
  "baby"               => "344845011",
  "books"              => "465610",
  "classical"          => "562034",
  "dvd"                => "562004",
  "electronics"        => "3510411",
  "foreignbooks"       => "465610",
  "healthpersonalcare" => "161669011",
  "hobbies"            => "13331821",
  "kitchen"            => "11717941",
  "music"              => "562032",
  "software"           => "637630",
  "sportinggoods"      => "361245011",
  "toys"               => "13331821",
  "vhs"                => "561972",
  "video"              => "562002",
  "videogames"         => "1060426"
}

module Amazon
  class Element
    def to_hash
      item_attr = self.get_element('ItemAttributes')
      authors = item_attr.get_array('Authors')
      authors = [item_attr.get('Author')] if authors.empty?
      {
        :asin            => self.get('ASIN'),
        :title           => item_attr.get('Title'),
        :authors         => authors,
        :formatted_price => ((self/'ListPrice/FormattedPrice').text rescue ''),
        :small_image     => self.get_hash('SmallImage'),
        :medium_image    => self.get_hash('MediumImage')
      }
    end
  end
end

Amazon::Ecs.options = {
    :associate_tag     => 'your tag',
    :AWS_access_key_id => 'your access_key_id',
    :AWS_secret_key    => 'your secret_key',
    :country           => :jp
}

node_id = ARGV[0].to_s.downcase

if BROWSE_NODE.keys.include?(node_id)
  res = Amazon::Ecs.browse_node_lookup(BROWSE_NODE[node_id], {
    :response_group => 'TopSellers'
  })

  items = res.doc.search('TopSeller').each_with_object([]) do |v, arr|
    arr << Amazon::Ecs.item_lookup(v.at('ASIN').text, {
      :response_group => 'Large'
    }).items.first.to_hash
  end
  items.each_with_index do |item, i|
    puts "%2d. %s" % [i + 1, item[:title]]
  end
else
  STDERR.puts "usage: #{File.basename($0)} #{BROWSE_NODE.keys.join('|')}"
  exit 1
end