#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 1991-2008 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
#     wmakePrintBuild
#
# Description
#     Print the version used when building the project.
#
#------------------------------------------------------------------------------
Script=${0##*/}

usage() {
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    cat<<USAGE
usage: $Script

Print the version used when building the project, in this order of precedence:
  * git description
  * \$WM_PROJECT_DIR/.build
  * \$WM_PROJECT_VERSION

USAGE
    exit 1
}
#------------------------------------------------------------------------------

# provide immediate help
if [ "$1" = "-h" -o "$1" = "-help" ]
then
    usage
fi

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

#
# persistent build tag
#
build="$WM_PROJECT_DIR/.build"
previous=$(tail -1 $build 2>/dev/null)

#
# building under git
# note: could also use --abbrev=32 for maximum resolution
#
version=$(git describe --always --tags 2>/dev/null)
if [ $? -eq 0 ]
then
    # update persistent build tag (this could be made optional or removed)
    if [ "$version" != "$previous" ]
    then
        if [ -w "$build" -a \( -w "$WM_PROJECT_DIR" -o ! -e "$build" \) ]
        then
            echo $version >| "$build" 2>/dev/null
        fi
    fi

    echo $version

elif [ -n "$previous" ]
then

    # use previous build tag
    echo $previous

else

    # fallback to WM_PROJECT_VERSION
    echo ${WM_PROJECT_VERSION:-unknown}

fi

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