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/usr/share/freefoam/utilities/foamUpdateCaseFileHeader is in libfreefoam-dev 0.1.0+dfsg-1build1.

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#!/bin/sh
#---------------------------------*- sh -*-------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 1991-2010 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 3 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, see <http://www.gnu.org/licenses/>.
#
# Script
#     foamUpdateCaseFileHeader
#
# Description
#     Updates the header of application files.
#     By default, writes current version in the header.
#     Alternatively version can be specified with -v option.
#     Also removes consecutive blank lines from file.
#
#------------------------------------------------------------------------------
foamVersion=0.1

usage() {
    cat<<USAGE

Usage: ${0##*/} [OPTION] <file1> ... <fileN>

options:
  -v VER  specifies the version to be written in the header
  -h      help

  Updates the header of application files and removes consecutive blank lines.
  By default, writes current OpenFOAM version in the header.
  An alternative version can be specified with the -v option.

USAGE
    exit 1
}


printHeader() {
    cat<<HEADER
/*------------------------------*- FOAMDict -*-------------------------------*\\
|               ______                _     ____          __  __              |
|              |  ____|             _| |_  / __ \\   /\\   |  \\/  |             |
|              | |__ _ __ ___  ___ /     \\| |  | | /  \\  | \\  / |             |
|              |  __| '__/ _ \\/ _ ( (| |) ) |  | |/ /\\ \\ | |\\/| |             |
|              | |  | | |  __/  __/\\_   _/| |__| / ____ \\| |  | |             |
|              |_|  |_|  \\___|\\___|  |_|   \\____/_/    \\_\\_|  |_|             |
|                                                                             |
|                   FreeFOAM: The Cross-Platform CFD Toolkit                  |
|                   Version:  ${foamVersion}  |
|                   Web:      http://freefoam.sourceforge.net                 |
\\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ${1};
    class       ${2};
    object      ${3};
}
HEADER
}


#
# extract attribute '$1' from file '$2'
#
FoamFileAttribute() {
    sed -n -e 's/[ ;]*$//' -e "s/^ *$1 *//p" $2
}


#
# OPTIONS
#
opts=$(getopt hv: $*)
if [ $? -ne 0 ]
then
    echo "Aborting due to invalid option"
    usage
fi
eval set -- '$opts'
while [ "$1" != "--" ]
do
    case $1 in
    -v)
        foamVersion=$2
        shift
        ;;
    -h)
        usage
        ;;
    esac
    shift
done
shift

[ $# -ge 1 ] || usage


# constant width for version
foamVersion=$(printf %-36s $foamVersion)

#
# MAIN
#
unset NOTE

for caseFile
do
    if grep FoamFile $caseFile >/dev/null 2>&1
    then
        echo "Updating case file: $caseFile"
        sed -n '/FoamFile/,/}/p' $caseFile > FoamFile.tmp

        FORMAT=$(FoamFileAttribute format FoamFile.tmp)
        CLASS=$(FoamFileAttribute  class  FoamFile.tmp)
        OBJECT=$(FoamFileAttribute object FoamFile.tmp)
        # extract NOTE?

        printHeader $FORMAT $CLASS $OBJECT $NOTE > FoamFile.tmp
        sed '1,/}/d' $caseFile | sed '/./,/^$/!d' >> FoamFile.tmp

        # use cat to avoid removing/replace soft-links
        [ -s FoamFile.tmp ] && cat FoamFile.tmp >| $caseFile
        rm -f FoamFile.tmp 2>/dev/null
    else
        echo " Invalid case file: $caseFile" 1>&2
    fi
done

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