Port from my gist + bundleify

.gitignore

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+.bundle
+.DS_Store
+.gems

Gemfile

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+source :rubygems
+
+gem 'mechanize'

Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    mechanize (2.0.1)
+      net-http-digest_auth (~> 1.1, >= 1.1.1)
+      net-http-persistent (~> 1.8)
+      nokogiri (~> 1.4)
+      webrobots (~> 0.0, >= 0.0.9)
+    net-http-digest_auth (1.2)
+    net-http-persistent (1.9)
+    nokogiri (1.5.0)
+    webrobots (0.0.12)
+      nokogiri (>= 1.4.4)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  mechanize

tumblr-photo-downloader.rb

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+require 'rubygems'
+require 'bundler'
+Bundler.require
+
+
+# Your Tumblr subdomain, e.g. "jamiew" for "jamiew.tumblr.com"
+site = "doctorwho"
+
+
+FileUtils.mkdir_p(site)
+
+concurrency = 8
+num = 50
+start = 0
+
+loop do
+  puts "start=#{start}"
+
+  url = "http://#{site}.tumblr.com/api/read?type=photo&num=#{num}&start=#{start}"
+  page = Mechanize.new.get(url)
+  doc = Nokogiri::XML.parse(page.body)
+
+  images = (doc/'post photo-url').select{|x| x if x['max-width'].to_i == 1280 }
+  image_urls = images.map {|x| x.content }
+
+  image_urls.each_slice(concurrency).each do |group|
+    threads = []
+    group.each do |url|
+      threads << Thread.new {
+        puts "Saving photo #{url}"
+        begin
+          file = Mechanize.new.get(url)
+          filename = File.basename(file.uri.to_s.split('?')[0])
+          file.save_as("#{site}/#{filename}")
+        rescue Mechanize::ResponseCodeError
+          puts "Error getting file, #{$!}"
+        end
+      }
+    end
+    threads.each{|t| t.join }
+  end
+
+  puts "#{images.count} images found (num=#{num})"
+  if images.count < num
+    puts "our work here is done"
+    break
+  else
+    start += num
+  end
+
+end