bak

# - Description
# This program enables you to create a buck up with date in its name, 
# which contains files symbolic links in copy source refers.

#--------------------
# Usage
#--------------------
# $ bak /path/to/source /path/to/dest

#!/bin/sh
exec ruby -S -x $0 "$@"
#! ruby

# Show usage
def usage
  puts "Usage: #$0 SOURCE DEST"
  puts "Copy SOURCE to DEST."
  exit 1
end

require 'fileutils'

$today = ".#{Time.now.strftime("%Y%m%d")}"

# Extends FileUtils::Entry_ in order to add today's date to file path.
class Ent < FileUtils::Entry_
    def initialize(a, b = nil, deref = false)
      @prefix = @rel = @path = nil
      if b
        @prefix = a +$today
        @rel = b.split('/').map!{|v| v + $today}.join('/')
      else
        @path = a +$today
      end
#p path
      @deref = deref
      @stat = nil
      @lstat = nil
    end
end

class Backup
  include FileUtils

  def self.copy_and_rename_entry(src, dest, preserve = false, dereference_root = false, remove_destination = false)
    # Source => Use plain FileUtils::Entry_
    FileUtils::Entry_.new(src, nil, dereference_root).traverse do |ent|
#p ent
      # Destination => Use class Ent to rewirte file path. 
      destent = Ent.new(dest, ent.rel, false)
      File.unlink destent.path if remove_destination && File.file?(destent.path)
      ent.copy destent.path
      ent.copy_metadata destent.path if preserve
    end
  end
end

# If number of given Argument Vector is other than two
if ARGV.size != 2
  usage
else
  Backup.copy_and_rename_entry(ARGV[0], ARGV[1], true)
end

exit