From: Robert Klemme <shortcutter@...>
Date: 2008-05-21T00:15:53+09:00
Subject: Extension of zlib

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.

Kind regards

robert

-- 
use.inject do |as, often| as.you_can - without end