#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 1991-2007 OpenCFD Ltd.
#    \\/     M anipulation  |
#-------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM.
#
#     OpenFOAM 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.
#
#     OpenFOAM 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 OpenFOAM; if not, write to the Free Software Foundation,
#     Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# Script
#     foamDiffSourceList <oldDir> <newDir> <tarFile>
#
# Description
#     Packs and compresses files that have changed (diff -uw) between
#     oldDir newDir
#
#------------------------------------------------------------------------------
tmpFile=${TMPDIR:-/tmp}/foamDiffList.$$

if [ $# -ne 3 ]; then
   echo "Usage : ${0##*/} oldDir newDir tarFile"
   echo ""
   echo "Find the files that changed (diff -uw) between <oldDir> and <newDir>"
   echo "and pack them into <tarFile>"
   echo ""
   exit 1
fi

# canonical form (no double and no trailing dashes)
oldDir=$(echo "$1" | sed -e 's@//*@/@g' -e 's@/$@@')
newDir=$(echo "$2" | sed -e 's@//*@/@g' -e 's@/$@@')
packFile=$3

if [ ! -d $oldDir ]; then
   echo "Error: directory $oldDir does not exist"
   exit 1
fi

if [ ! -d $newDir ]; then
   echo "Error: directory $newDir does not exist"
   exit 1
fi

if [ -f $packFile ]; then
   echo "Error: $packFile already exists"
   exit 1
fi

# Clean up on termination and on Ctrl-C
trap 'rm -f $tmpFile 2>/dev/null; exit 0' EXIT TERM INT

fileCount=0
cat /dev/null > $tmpFile

find -H $newDir                \
    ! -type d -type f          \
    ! -name "*~"               \
 -a ! -name ".*~"              \
 -a ! -name ".#*"              \
 -a ! -name "*.orig"           \
 -a ! -name "*.dep"            \
 -a ! -name "*.o"              \
 -a ! -name "*.so"             \
 -a ! -name "*.a"              \
 -a ! -name "*.tgz"            \
 -a ! -name "core"             \
 -a ! -name "core.[1-9]*"      \
 -a ! -name "log[0-9]*"        \
| sed                          \
 -e "\@$newDir/lib/@d"         \
 -e "\@$newDir/src/other/mico-*/platforms@d"  \
 -e "\@$newDir/src/other/mpich-*/platforms@d" \
 -e "\@$newDir/src/other/mpich-*/lib@d"       \
 -e "\@$newDir/src/other/lam-*/platforms@d"   \
 -e "\@$newDir/src/other/openmpi-*/platforms@d"   \
 -e '\@applications/bin/@d'      \
 -e '\@/t/@d'                    \
 -e '\@Make[.A-Za-z]*/[^/]*/@d'  \
 -e '\@[Dd]oxygen/html@d'        \
 -e '\@[Dd]oxygen/latex@d'       \
 -e '\@[Dd]oxygen/man@d'         \
 -e "s@$newDir/*@@"              \
 | \
 (
    while read file
    do
       (( fileCount=$fileCount + 1))

       if [ -f "$oldDir/$file" ]
       then
          diff -uw $oldDir/$file $newDir/$file >/dev/null 2>&1
          if [ $? = 1 ]
          then
             echo "[DIFF]" $file
             echo $newDir/$file >> $tmpFile
             continue
          fi
       else
          echo "[NEW]" $file
          echo $newDir/$file >> $tmpFile
          continue
       fi
       echo $fileCount $file
    done
 )

# file fileCount
fileCount=$(cat $tmpFile | wc -l)
echo "----------------------------------------------------------------------"
echo "pack $fileCount changed/new files"

tar -czpf $packFile --files-from $tmpFile

if [ $? = 0 ]
then
   echo "Finished packing changed files from $newDir into $packFile"
else
   echo "Error: failure packing changed files from $newDir into $packFile"
   rm -f $packFile 2>/dev/null
fi
echo "----------------------------------------------------------------------"

# ----------------------------------------------------------------------------