Extension of zlib

ruby-talk
1

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

2

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

···

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.

3

does anybody else think this (or something similar) would be a useful
extension to zlib?

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.

I don't believe so. ARGFZ plays the same role as ARGF and your argument would apply there as well. But it's not the case since option processing is typically done *before* ARGF / ARGFZ are employed (see OptionParser documentation for examples).

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

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

I am not sure I get your point here. Can you elaborate?

Kind regards

  robert

···

On 20.05.2008 18:19, Daniel Berger wrote:

On May 20, 9:15 am, "Robert Klemme" <shortcut...@googlemail.com> > wrote: