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comp.lang.ruby

file manipulation

Sergio Ruiz

4/12/2007 7:53:00 PM

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 via http://www.ruby-....
2 Answers

William James

4/12/2007 10:17:00 PM

0

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-....


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

Sergio Ruiz

4/13/2007 2:25:00 AM

0


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

perfect!

thanks so much!

--
Posted via http://www.ruby-....