#!/bin/bash
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2011 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
#     foamExec
#
# Description
#     Usage: foamExec [-v foamVersion] <foamCommand> ...
#
#     Runs the <foamVersion> version of executable <foamCommand>
#     with the rest of the arguments.
#
#     Can also be used for parallel runs. For example,
#     \code
#         mpirun -np <nProcs> \
#             foamExec -version <foamVersion> <foamCommand> ... -parallel
#     \endcode
#
# Note
#     This script must exist in <foamInstall>/OpenFOAM-<VERSION>/bin/
#     or <foamInstall>/openfoam<VERSION>/bin/ (for the debian version)
#
#     foamEtcFile must be found in the same directory as this script
#
# SeeAlso
#    foamEtcFile
#
#------------------------------------------------------------------------------
usage() {
    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    cat<<USAGE

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

options:
  -prefix <dir>     specify an alternative installation prefix
                    pass through to foamEtcFile and set as FOAM_INST_DIR
  -version <ver>    specify an alternative OpenFOAM version
                    pass through to foamEtcFile
  -help             print the usage

* run a particular OpenFOAM version of <application>

USAGE
    exit 1
}

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

# the bin dir:
binDir="${0%/*}"

# the project dir:
projectDir="${binDir%/bin}"

# the prefix dir (same as foamInstall):
prefixDir="${projectDir%/*}"

# # the name used for the project directory
# projectDirName="${projectDir##*/}"


unset etcOpts version
# parse options
while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help)
        usage
        ;;
    -m | -mode)
        [ "$#" -ge 2 ] || usage "'$1' option requires an argument"
        etcOpts="$etcOpts $1 $2"    # pass-thru to foamEtcFile
        shift
        ;;
    -p | -prefix)
        [ "$#" -ge 2 ] || usage "'$1' option requires an argument"
        etcOpts="$etcOpts $1 $2"    # pass-thru to foamEtcFile
        prefixDir="$2"
        shift
        ;;
    -v | -version)
        [ "$#" -ge 2 ] || usage "'$1' option requires an argument"
        etcOpts="$etcOpts $1 $2"    # pass-thru to foamEtcFile
        version="$2"
        shift
        ;;
    --)
        shift
        break
        ;;
    -*)
        usage "invalid option '$1'"
        ;;
    *)
        break
        ;;
    esac
    shift
done

#
# Find and source OpenFOAM settings (bashrc)
# placed in function to preserve command-line arguments
#
sourceRc()
{
    foamDotFile="$($binDir/foamEtcFile $etcOpts bashrc)" || {
        echo "Error : bashrc file could not be found for OpenFOAM-${version:-${WM_PROJECT_VERSION:-???}}" 1>&2
        exit 1
    }

    # set to consistent value before sourcing the bashrc
    export FOAM_INST_DIR="$prefixDir"

    . $foamDotFile $FOAM_SETTINGS
}


[ "$#" -ge 1 ] || usage "no application specified"

sourceRc
exec "$@"

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