tumblr-backup.rb

#!/usr/bin/env ruby
# tumblr-backup.rb
# downloads posts and related info from your a tumblr blog
# and saves them to the filesystem
# in yaml format

# Requires Mark Wunsch's awesome tumblr gem : http://github.com/mwunsch/tumblr
require "rubygems"
require "tumblr"
require "yaml"
require "fileutils"

#simply write a file to the disk
def save_file(dir, file_name, content)
  FileUtils.mkdir_p(dir)
  File.open(File.join(dir, file_name), "w") do |out|      
    out.write(content)
  end
end

tumblelog_name = ARGV[0]
email = ARGV[1] 
password = ARGV[2] 
backup_dir = File.join(ARGV[3], tumblelog_name)

#get theme and info
puts "Authenticating"
tumblr = Tumblr.new(email, password).authenticate(true).perform
tumblelog = tumblr['tumblr']['tumblelog'].map{|t| t if t["name"] == tumblelog_name}.compact[0]
puts "Saving info"
save_file(backup_dir, "theme.html", tumblelog["theme_source"])
tumblelog.delete("theme_source")
save_file(backup_dir, "#{tumblelog_name}.yaml", tumblelog.to_yaml)

#get all the posts
if tumblelog["posts"].to_i > 0
  puts "Found #{tumblelog["posts"]} posts"
  reader = Tumblr::Reader.new(email, password)    
  (tumblelog["posts"].to_i / 50.0).ceil.times do |i|
    start = i == 0 ? 0 : i * 50
    if start + 50 > tumblelog["posts"].to_i
      num = tumblelog["posts"]
    else
      num = start + 50
    end
    puts "Downloading #{start + 1} to #{num}"
    response = reader.authenticated_read(tumblelog_name, {:num => 50, :start => start}).perform
    posts = Tumblr::Reader.get_posts(response)    
    posts.each {|p| save_file(File.join(backup_dir, 'posts'), "#{p.post_id}.yaml", p.to_yaml)}
  end
  puts "Done"
else
  puts "No posts found"
end