temp_directory.rb

require 'fileutils'
require 'tmpdir'

include FileUtils

class TempDirectory

  def self.scoped(root = TempDirectory.timestamp_directory_name)
    temp_dir = new(root)  
    yield temp_dir if block_given?
    temp_dir.destroy!
  end
    
  def initialize(root)
    @root = root
    ensure_clean_root
  end
  
  def mkdir(name)
    directory_path = File.join(@root, name)
    ensure_directory_exists directory_path
  end
  
  def destroy!
    puts "wiping temp root '#{@root}'"
    FileUtils.rm_rf  Dir.glob(File.join(@root, "**"))
    Dir.delete(@root) if File.directory?(@root)
  end
  
  private
  
  def self.timestamp_directory_name
    File.join(Dir.tmpdir, Time.now.to_i.to_s)
  end
  
  def ensure_clean_root
    destroy!
    ensure_directory_exists @root
  end
  
  def ensure_directory_exists(directory)
    puts "ensuring directory exists '#{directory}'"
    Dir.mkdir(directory) unless File.directory?(directory)
    directory
  end
  
end