file_watcher

puts "what file should I watch?"
watch = gets
puts "ok, if anything changes in that file I'll put it in changelog.txt"
oldlog = nil
newlog = nil

##loop forever
loop do

  ##if the file has changed
    if oldlog != (newlog = File.read(watch))
      ## write in the change log
        File::open('changelog.txt','w') do |f|
          f << Diffy::Diff.new(oldlog,newlog)
        end
    end

  ##make a copy of the file for next time around
    oldlog = newlog

  ##sleep for a moment
    sleep(1)
end