new_contents: ##############################################################################
  # Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
  # Produced at the Lawrence Livermore National Laboratory.
  #
  # This file is part of Spack.
  # Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
  # LLNL-CODE-647188
  #
  # For details, see https://github.com/llnl/spack
  # Please also see the LICENSE file for our notice and the LGPL.
  #
  # This program is free software; you can redistribute it and/or modify
  # it under the terms of the GNU Lesser General Public License (as
  # published by the Free Software Foundation) version 2.1, February 1999.
  #
  # 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 terms and
  # conditions of the GNU Lesser General Public License for more details.
  #
  # You should have received a copy of the GNU Lesser 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
  ##############################################################################
  from spack import *
  import os
  import re
  
  
  class Ack(Package):
      """ack 2.14 is a tool like grep, optimized for programmers.
  
         Designed for programmers with large heterogeneous trees of
         source code, ack is written purely in portable Perl 5 and takes
         advantage of the power of Perl's regular expressions."""
  
      homepage = "http://beyondgrep.com/"
      url      = "http://beyondgrep.com/ack-2.14-single-file"
  
      version('2.14', 'e74150a1609d28a70b450ef9cc2ed56b', expand=False)
  
      # trust that there's a system perl for now, but perhaps someday we
      # should:
      # depends_on('perl')
  
      def unpack(self):
          pass
  
      def install(self, spec, prefix):
          mkdirp(prefix.bin)
          # find the file named like ack-2.14-single-file in a version
          # independent manner (there should be only one )and install it
          # as `ack`.
          for f in os.listdir('.'):
              if re.match('ack-\d*\.\d*-single-file', f):
                  install(f, join_path(prefix.bin, "ack"))
                  set_executable(join_path(prefix.bin, "ack"))
  
subject: Add package for ack