From: David Tran <email55555@...>
Date: 2005-08-04T06:57:44+09:00
Subject: Re: Comparing directory contents

FILES_NAME = 'files.txt'          # files.txt will content all files name
OLD_FILES_NAME = 'old_files.txt'  # backup for current files.txt

def get_files( pathname )
  result = []
  pathname.children.each { |e| 
    result << e.to_s 
    result += get_files(e) if e.directory?
  }
  result
end

old_files = []
begin
  old_files = IO.readlines(FILES_NAME).map { |e| e.chomp }
  File.rename(FILES_NAME, OLD_FILES_NAME)
rescue
end
  
new_files = get_files(Pathname.new(File.expand_path('.'))).sort
open(FILES_NAME, 'w') { |f| new_files.each { |e| f.puts(e) } }

extra = new_files - old_files
removed = old_files - new_files

if !extra.empty?
  puts "Extra files:"
  extra.each { |f| puts f }
  puts  
end

if !removed.empty?
  puts "Removed files:"
  removed.each { |f| puts f }
  puts
end

if extra.empty? && removed.empty?
  puts "Identical."
end