From: William James <w_a_x_man@...>
Date: 2007-04-13T07:20:06+09:00
Subject: Re: file manipulation

On Apr 12, 2:52 pm, Sergio Ruiz <ser...@village-buzz.com> wrote:
> as a part of another program, i need to be able to keep an index number
> inside of a file..
>
> what i want to do is:
>
> open the file
> get its contents and store in a local variable
> clear its contents
> store an incremented version of the index..
>
> right now, i know i am doing this in a kludgy way...
>
> it works, but not pretty..
>
> i end up opening the file 'r', getting the number
> closing the file
>
> opening it again 'w+'
> storing the value
> closing the file..
>
> is there a method that will just clear the file?
>
> my current code is:
>
>   def self.get_index
>     index_file = File.open('index','r')
>     index = index_file.gets
>     index_file.close
>     index_file = File.open('index','w+')
>     puts "index value: " + index.to_s
>     index_file.puts(index.to_i + 1).to_s
>     index_file.close
>   end
>
> --
> Posted viahttp://www.ruby-forum.com/.


File.open( 'index', 'r+') {|f|
  index = f.gets.to_i
  puts "Index value: #{ index }"
  f.rewind
  f.truncate(0)
  f.puts( index + 1 )
}