From: Kurt Euler <keuler@...>
Date: 2002-06-03T15:42:08+09:00
Subject: RE: Problem: Newbie with a question on file arrays and file inser	tion ...

Thanks very much Nabu and Stehan!

Question: Can I do as you describe with Ruby 1.67? I want to make sure, since I read somewhere that you have to have at least rev 1.7 to read an entire file, but I could be mistaken. (And I thought I'd stick with 1.67, since it supposed to be the most "stable".)

-k euler


-----Original Message-----
From: nobu.nokada@softhome.net [mailto:nobu.nokada@softhome.net]
Sent: Sunday, June 02, 2002 1:43 AM
To: ruby-talk@ruby-lang.org
Subject: Re: Problem: Newbie with a question on file arrays and file
insertion ...


Hi,

At Sun, 2 Jun 2002 17:09:07 +0900,
Stefan Schmiedl wrote:
> > 2)- Say I have text files FileA and FileB. FileA contains a
> > text tag in the somewhere in it called, say,
> > "<foobar>". How can I:
> > 
> >      - locate the tag <foobar> in FileA and
> >      - replace <foobar> with the entire contents of FileB.
> > 
> >      In short, I want to insert FileB in FileA where the <foobar> tag is,
> >      then delete the tag.
> 
> if the files are not too large, you could read them as a whole
> and then just do string substitution. 
> 
> a = File("a").read
> b = File("b").read
> 
> a.gsub(/<foobar>/, b)

If "a" is large:

  require 'tempfile'
  require 'ftools'

  t = Tempfile.new("foobar")
  b = nil
  IO.foreach("a") do |line|
    t.print(line.gsub(/<foobar>/) do
      b ||= File.open("b") {|b| b.read}
    end)
  end
  File.copy(t.path, "a")

> Be warned: this is written on a sunday morning before breakfast :-)

Too, except that it's an evening here. :-)

-- 
Nobu Nakada