#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | foam-extend: Open Source CFD
#  \\    /   O peration     | Version:     4.0
#   \\  /    A nd           | Web:         http://www.foam-extend.org
#    \\/     M anipulation  | For copyright notice see file Copyright
#------------------------------------------------------------------------------
# License
#     This file is part of foam-extend.
#
#     foam-extend 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.
#
#     foam-extend 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 foam-extend.  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 e.g.
#     mpirun -np <nProcs> \
#         foamExec -v <foamVersion> <foamCommand> ... -parallel
#
#------------------------------------------------------------------------------
Script=${0##*/}

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

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

options:
  -v ver        specify foam version
  -help         this usage

* run a particular foam version of <application>

USAGE
    exit 1
}


# This script should exist in <foamInstall>/foam-extend-<VERSION>/bin/
# extract the <foamInstall> and <version> elements
# using a function preserves the command args
getDefaults() {
    set -- $(echo $0 | sed -e 's@/foam-extend-\([^/]*\)/bin/[^/]*$@ \1@')
    foamInstall=$1
    version=$2
}

getDefaults

# parse options
while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help)
        usage
        ;;
    -v)
        shift
        version=$1
        shift
        ;;
    --)
        shift
        break
        ;;
    -*)
        usage "invalid option '$1'"
        ;;
    *)
        break
        ;;
    esac
done

if [ "$#" -lt 1 ]
then
    usage "no application specified"
fi

unset foamDotFile

# Check user-specific foam-extend bashrc file
foamDotFile="$HOME/.foam-extend-$version/bashrc"
if [ -f $foamDotFile ]
then
    . $foamDotFile
    foamDotFile=okay
else
    # Use the FOAM_INST_DIR variable for locating the installed version
    for FOAM_INST_DIR in $foamInstall $WM_PROJECT_INST_DIR
    do
        foamDotFile="$FOAM_INST_DIR/foam-extend-$version/etc/bashrc"
        if [ -f $foamDotFile ]
        then
            . $foamDotFile
            foamDotFile=okay
            break
        fi
    done
fi


if [ "$foamDotFile" != okay ]
then
    echo "Error : bashrc file could not be found for foam-extend-$version" 1>&2
    exit 1
fi

# Pass on the rest of the arguments
exec $*

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