#!/usr/local/bin/ruby -W0
# -*- Mode:Ruby; Coding:us-ascii-unix; fill-column:158 -*-
################################################################################################################################################################
##
# @file      gitManifest.rb
# @author    Mitch Richling <https://www.mitchr.me/>
# @brief     Create and update MANIFEST files for everything in the CWD.@EOL
# @std       Ruby1.8
# @copyright 
#  @parblock
#  Copyright (c) 1996,1998,2011,2015,2016, Mitchell Jay Richling <http://www.mitchr.me> All rights reserved.
#
#  Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
#
#  1. Redistributions of source code must retain the above copyright notice, this list of conditions, and the following disclaimer.
#
#  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions, and the following disclaimer in the documentation
#     and/or other materials provided with the distribution.
#
#  3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without
#     specific prior written permission.
#
#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
#  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
#  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
#  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#  @endparblock
# @filedetails
#
#  MANIFEST files are great because they tie a "version number" (for the MANIFEST.txt file itself) to the version numbers and check sums for every file in a
#  directory.  This is a nice way to have versions for each release of a software system made up of many source files.  Only files in GIT with a working
#  version in the CWD make it into the MANIFEST.
#
################################################################################################################################################################

#---------------------------------------------------------------------------------------------------------------------------------------------------------------
require 'digest/sha1' 

#-----------------------------------------------------------------------------------------------------------------------------------
system('git checkout MANIFEST.txt')
open('MANIFEST.txt', 'w') do |ofile|
  ofile.printf("%-41s %s\n", "SHA1", "File Name")  
  IO.popen("git ls-files -s", 'r') do |pipe|
    pipe.each_line do |line|
      (modes, csum, numb, fname) = line.chomp.split(/\s+/, 4)
      if ((FileTest.exist?(fname)) and (fname != "MANIFEST.txt")) then
        fileDigest = nil
        open(fname, 'r') do |ofile|
          fileDigest = Digest::SHA1.hexdigest(ofile.read())
        end
        ofile.printf("%-41s %s\n", fileDigest, fname.inspect)
      end
    end
  end
end

system('git diff --quiet MANIFEST.txt || git commit -m "AUTO GENERATED MANIFEST" MANIFEST.txt')