#! /usr/bin/env ruby

require "date"

dir = ARGV[0] || raise("ERROR: arg1 must be dir")

Dir.chdir dir

files_and_times = {}
Dir["*.patch"].sort.each do |filename|
  dateline = `cat #{filename} | grep "Date:"`
  datestr = dateline.split("Date:").last.strip
  time = DateTime.parse datestr
  files_and_times[filename] = time
end

count = 0
files_and_times.sort_by {|k,v| v}.each do |filename, time|
  count += 1
  _, patch_name = filename.split("-", 2)
  new_filename = sprintf("%4.4d-%s", count, patch_name)
  printf "mv -f %s %s # %s\n", filename, new_filename, time
end

STDERR.print "\n**\n** REMEMBER TO UPDATE THE Manifest.txt FILE\n**\n"