From: Daniel Berger <djberg96@...>
Date: 2008-05-21T01:19:17+09:00
Subject: Re: Extension of zlib



On May 20, 9:15 am, "Robert Klemme" <shortcut...@googlemail.com>
wrote:
> Hi,
>
> does anybody else think this (or something similar) would be a useful
> extension to zlib?
>
> file zliba.rb:
>
> require 'zlib'
>
> # Conveniently process a number of files that may
> # be a mixture of gzip compressed and uncompressed
> # files.
>
> ARGFZ = Class.new do
>   include Enumerable
>
>   def each(&b)
>     ::ARGV.each do |arg|
>       if arg == "-"
>         $stdin.each(&b)
>       else
>         io = ::Zlib::GzipReader.open(arg) rescue ::File.open(arg)
>         begin
>           io.each(&b)
>         ensure
>           io.close
>         end
>       end
>     end
>     self
>   end
>
>   # addional methods for gets etc. could be added
>   # but seeking is too hard to be possible
>
> end.new
>
> Example usage, file catz.rb:
>
> #!/bin/env ruby
>
> require 'zliba' # this would be 'zlib' once this is integrated
>
> ARGFZ.each do |line|
>   puts line
> end
>
> Then on shell prompt:
>
> catz.rb foo foo.gz
>
> Will print all lines from foo and then from foo.gz.

This seems like something that belongs in a custom option handler, not
in zlib directly, especially since I strongly suspect you're going to
break some option parsers with that code.

While we're on the topic of zlib, see zliby:

http://rubyforge.org/projects/zliby/

Regards,

Dan