#!/usr/bin/env ruby
#
# timestamp.rb - rename files according to the timestamp
#
# Copyright:: (C) 2006 Toshiaki Katayama <k@kumamushi.org>
# License::   The Ruby License
# Website::   http://kumamushi.org/~k/resize/
# Version::   1.0
#

if ARGV[0] =~ /^[-+]\d+/
  hours = ARGV.shift.to_i
else
  hours = 0
end

ARGV.each do |file|
  next unless File.file?(file)

  dir = File.dirname(file)
  sfx = File.basename(file).split('.').last.downcase

  next unless /jpg|jpeg|mpg|mpeg|wmv|avi|thm|mov/.match(sfx)

  mtime = File.mtime(file) + hours * 60 * 60
  time = mtime.strftime("%Y-%m%d-%H%M-%S")
  count = 0
  while File.exist?("#{dir}/#{time}#{sprintf("%02d",count)}.#{sfx}")
    count += 1
  end
  newfile = "#{dir}/#{time}#{sprintf("%02d",count)}.#{sfx}"
  puts "Moving #{file} -> #{newfile}"
  File.rename(file, newfile)
end