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/usr/bin/dpkg-ruby is in ruby-debian 0.3.9.

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#!/usr/bin/ruby
# 
# dpkg-ruby - ruby script to parse status,available and Packages,Sources
#             dpkg-awk clone
# Copyright (c) 2001 Fumitoshi UKAI <ukai@debian.or.jp>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# $Id: dpkg-ruby,v 1.6 2001/04/20 19:07:00 ukai Exp $
#

require 'debian'
require 'getoptlong'

filename = Debian::Dpkg::STATUS_FILE
$debug = 0
sortfield = []
numfield = []
$rec_sep = ""

def usage
  $stderr.puts "#{$0} [opts] 'field:regexp' .. -- 'output_field' .."
  $stderr.puts " opts: [-f file] [-d nn] [-s sf] [-n nf] [-rs rs]"
end

opts = GetoptLong.new(
		      ["--file", "-f",  GetoptLong::REQUIRED_ARGUMENT],
		      ["--debug", "-d", GetoptLong::OPTIONAL_ARGUMENT],
		      ["--sort", "-s",  GetoptLong::REQUIRED_ARGUMENT],
		      ["--numeric_field", "-n", GetoptLong::REQUIRED_ARGUMENT],
		      ["--rec_sep", "--rs", GetoptLong::REQUIRED_ARGUMENT],
		      ["--help", "-h",  GetoptLong::NO_ARGUMENT])
opts.ordering = GetoptLong::REQUIRE_ORDER

begin
  opts.each {|opt, arg|
    case opt
    when "--file" then filename = arg
    when "--debug" then 
      if arg
	$debug = arg
      else
	$debug += 1
      end
    when "--sort" then 
      sortfield += arg.split(" ").collect{|a| a.split(",")}
      sortfield.flatten!
    when "--numeric_field" then
      numfield += arg.split(" ").collect{|a| a.split(",")}
      numfield.flatten!
    when "--rec_sep" then
      $rec_sep = arg
    when "--help" then 
      usage; exit 0
    else
      opts.terminate
    end
  }
rescue GetoptLong::InvalidOption
  usage; exit 1
end

field = {}
$outputfield = []
while arg = ARGV.shift
  break if arg == "--"
  unless /^([^:]+):(.*)/ =~ arg
    $stderr.puts "E: invalid argument #{arg}"
    exit 1
  end
  field[$1] = Regexp.new($2)
end
$outputfield = ARGV

da = Debian::Archives.load(filename)

def output(deb)
  if $outputfield.empty?
    deb.fields {|f|
      puts "#{f.capitalize}: #{deb[f]}"
    }
    puts $rec_sep
  elsif $outputfield[0] == '^'
    deb.fields {|f|
      unless $outputfield.find {|of| of.capitalize == f.capitalize }
	puts "#{f.capitalize}: #{deb[f]}"
      end
    }
    puts $rec_sep
  else
    $outputfield.each {|f| 
      puts "#{f.capitalize}: #{deb[f]}"
    }
    if $rec_sep != "" || $outputfield.length > 1
      puts $rec_sep
    end
  end
end

mp = []
da.each_package {|d|
  match = true
  field.each {|f,re|
    unless re =~ d[f]
      match = false
      break
    end
  }
  if match
    if sortfield.empty?
      output(d)
    else
      mp.push(d)
    end
  end
} 

unless sortfield.empty?
  mp.sort{|a,b|
    d = 0
    sortfield.each{|sf|
      if numfield.include?(sf)
	d = a[sf].to_i <=> b[sf].to_i
      else
	d = a[sf] <=> b[sf]
      end
      if d != 0
	break
      end
    }
    d
  }.each {|d|
    output(d)
  }
end