Raketasks for deploying Octopress generated site to Heroku

Rakefile

desc "deploy basic rack app to heroku"
multitask :heroku do
  puts "## Deploying to Heroku "
  unless File::exists?(".heroku_failed")
    Rake::Task[:generate].execute
  end
  cd "#{public_dir}" do
    system "git add ."
    puts "\n## Committing: Site updated at #{Time.now.utc}"
    message = "Site updated at #{Time.now.utc}"
    system "git commit -m '#{message}'"
    puts "\n## Pushing generated #{public_dir} website"
    system "git push heroku master"
    if $? == 0
      File::delete(".heroku_failed") if File::exists?(".heroku_failed")
      puts "\n## Heroku deploy complete"
    else
      File::write(".heroku_failed", "w") unless File::exists?(".heroku_failed")
      puts "\n## Heroku deploy had a problem."
    end
  end
end

desc "Commit Source Changes and deploy to heroku in one fell swoop"
multitask :deploy_heroku do
  puts "## Committing changes to source"
  system "git status"
  if $? == 0
    system "git add ."
    puts "\n## Committing: Source updated at #{Time.now.utc}"
    message = "Source updated at #{Time.now.utc}"
    system "git commit -m '#{message}'"
  end
  Rake::Task[:heroku].execute
end

I have my blog techonamission.com on heroku and deploy just the generated site files to keep slug size and memory usage down (running on one dyno). The public_dir variable is set to _heroku/public. That directory is ignored in the git repo for my octopress install and instead is it's own repository/heroku app. To get it to work in this way, I just copied the Gemfile (with just sinatra as a dependency) and the config.ru files so that heroku won't complain.