#!/usr/bin/env ruby
#
# Uses the appropriate tool to unpack the files given
#

class Unpack

  def initialize
    @motions = false
  end
  
  def unpack(file)
    cmd = nil
    if file.match /\.tar\.gz$/
      cmd = "tar xvfz"
    elsif file.match /\.tgz$/
      cmd = "tar xvfz"
    elsif file.match /\.tar$/
      cmd = "tar xvf"
    elsif file.match /\.gz$/
      cmd = "gunzip"
    elsif file.match /\.zip$/
      cmd = "unzip"
    elsif file.match /\.bzip2$/
      cmd = "bunzip2"
    elsif file.match /\.bz2$/
      cmd = "bunzip2"
    elsif file.match /\.jar$/
      cmd = "jar xvf"
    else
      STDERR.puts "Couldn't find tool for " + file
      return
    end

    command = cmd + " " + file
    if @motions
      STDERR.puts command
    else
      exec command
    end

  end
  
  def main(argv)
    files = []
    argv.each do |arg|
      if File.exist? arg
        files << arg
      else
        if arg == "-n"
          @motions = true
        end
      end
    end
    files.map {|file| unpack file}
  end  

end  

Unpack.new.main ARGV