#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     | Website:  https://openfoam.org
#   \\  /    A nd           | Copyright (C) 2011-2018 OpenFOAM Foundation
#    \\/     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.
#
#------------------------------------------------------------------------------
error() {
    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    usage
    exit 1
}

usage() {
    cat<<USAGE

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

options:
  -version <ver>    specifies the version to be written in the header
  -help             print the usage

  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 -version option.

USAGE
}

while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help)
        usage && exit 0
        ;;
    -v | -version)
        [ "$#" -ge 2 ] || error "'$1' option requires an argument"
        version="$2"
        shift 2
        ;;
    -*)
        error "unknown option: '$*'"
        ;;
    *)
        break
        ;;
    esac
done

echo "$version" | grep -Eq '^([0-9]\.[0-9x]|dev)$' || \
    error "The version number is \"${version}\"." \
    "The format must be MAJOR.MINOR (e.g. \"$WM_PROJECT_VERSION\" or \"dev\")"

# constant width for version - default to WM_PROJECT_VERSION
version=$(printf %-36s "${version:-$WM_PROJECT_VERSION}")

[ $# -ge 1 ] || error

printHeader()
{
    cat<<HEADER
/*--------------------------------*- C++ -*----------------------------------*\\
  =========                 |
| \\\\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\\\    /   O peration     | Version:  $version  |
|   \\\\  /    A nd           | Website:  https://openfoam.org                  |
|    \\\\/     M anipulation  |                                                 |
\\*---------------------------------------------------------------------------*/
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"
}


#
# main
#

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

        format=$(FoamFileAttribute format $tmpFile)
        class=$(FoamFileAttribute  class  $tmpFile)
        object=$(FoamFileAttribute object $tmpFile)

        printHeader "$format" "$class" "$object" > $tmpFile

        sed '1,/}/d' $caseFile | sed '/./,/^$/!d' >> $tmpFile

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

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