From: Urban Hafner <the-master-of-bass@...>
Date: 2001-03-10T06:13:37+09:00
Subject: [ruby-talk:12360] Re: File with length 0

Sorry for my late answer, but I've been busy.

Tammo Freese <tammo.freese@offis.de> wrote:
[...]  
>2) If you run your program below, there are cases where the changed program
>   can be run, too. As you run it with "ruby", it will actually be executed
>   and lead to additional files!
I know and that was my intention! But nevertheless thank you for your
suggestions. As you might see in the code I've used your suggestion with
the -c option, but solved the time problem with sleep(0.15) because otherwise
I would get to long names.

I'd like to get some suggestions on improvements of my code.

Urban

--

"coordinator.rb"

workingdir = Dir.getwd
print "Number of generations: "
generations = gets
generations = generations.to_i
1.upto(generations) do
  files = Dir.entries("evolution")
  files.delete("."); files.delete("..")
  Dir.chdir("evolution")
  files.each {|child|
    if system("ruby","-c","#{child}") == false
      File.delete("#{child}")
      files.delete("#{child}")
    else
      sleep(0.15)
      if system("ruby","#{child}") == false
	File.delete("#{child}")
	files.delete("#{child}")
      end
    end
  }
  Dir.chdir("#{workingdir}")
end

--

"evolution.rb"

get = File.new($0,"r")
child = "#{Time.now.to_f}"
put = File.new(child,"w")
lines = get.readlines
1.upto(Kernel.rand(0.5*lines.length)) do
  changeline = Kernel.rand(lines.length-1)
  string = lines[changeline]
  changechar = Kernel.rand(string.length-1)
  if Kernel.rand(128) == 128
    string[changechar] = ""
  else
    chars = Kernel.rand(127).chr
    2.upto(Kernel.rand(5)) do
      chars = chars + Kernel.rand(127).chr
    end
    string[changechar] = chars
  end
  lines[changeline] = string
end
lines.each {|item| put.puts(item)}
put.close; get.close

--

"install.rb"

Dir.mkdir("evolution")
get = File.open("evolution.rb","r")
Dir.chdir("evolution")
put = File.open("evolution.rb","a")
get.each {|line| put.puts(line)}
get.close
put.close