Rake task to generate an empty Sequel migration

gistfile1.rb

namespace :db do
  desc "Create a migration with NAME="
  task :create_migration do
    name = ENV["NAME"]

    if name.nil?
      puts 'You must specify a migration name (e.g. rake db:create_migration NAME=create_events)!'
      exit false
    end

    content = "Sequel.migration do\n  change do\n  end\nend"
    timestamp = Time.now.to_i
    directory = File.join(File.dirname(__FILE__), 'db/migrate')
    filename = File.join(directory, "#{timestamp}_#{name}.rb")

    unless File.directory?(directory)
      FileUtils.mkdir_p directory
    end

    File.open(filename, 'w') do |f|
      f.puts content
    end

    puts "Created the migration #{filename}"
  end
end