#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | foam-extend: Open Source CFD
#  \\    /   O peration     |
#   \\  /    A nd           | For copyright notice see file Copyright
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# 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
#     foamClearPolyMesh
#
# Description
#    Remove the contents of the constant/polyMesh directory
#    as per the Foam::polyMesh::removeFiles() method.
#
#------------------------------------------------------------------------------
usage() {
    while [ "$#" -ge 1 ]; do echo "$1" 1>&2; shift; done
    cat <<USAGE 1>&2

usage: ${0##*/} [-case dir] [-region name]

    Remove the contents of the constant/polyMesh directory
    as per the Foam::polyMesh::removeFiles() method.

USAGE
   exit 1
}

unset caseDir regionName

# parse a single option
while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help)
        usage
        ;;
    -case)
        [ "$#" -ge 2 ] || usage "'$1' option requires an argument"
        cd "$2" 2>/dev/null || usage "directory does not exist:  '$2'"
        caseDir=$2
        shift 2
        ;;
    -region)
        [ "$#" -ge 2 ] || usage "'$1' option requires an argument"
        regionName=$2
        shift 2
        ;;
    *)
        usage "unknown option/argument: '$*'"
        ;;
    esac
done

if [ -n "$regionName" ]
then
    meshDir=$regionName/polyMesh
else
    meshDir=polyMesh
fi

# if -case was specified: insist upon 'constant/polyMesh'
if [ -n "$caseDir" ]
then
    if [ -d constant/$meshDir ]
    then
        # use constant/polyMesh
        meshDir=constant/$meshDir
    else
       echo "Error: no 'constant/$meshDir' in $caseDir" 1>&2
       exit 1
    fi
else
    if [ -d constant/$meshDir ]
    then
        # use constant/polyMesh
        meshDir=constant/$meshDir
    elif [ -d $meshDir ]
    then
        # likely already in constant/ - do not adjust anything
        :
    elif [ "${PWD##*/}" = polyMesh -a -z "$regionName" ]
    then
        # apparently already within polyMesh/
        meshDir=.
    else
        echo "Error: no appropriate 'polyMesh/' directory found" 1>&2
        exit 1
    fi
fi


#
# remove files (mesh itself, modifiers, snappyHexMesh ones) and subdirectories
#
echo "Clearing ${caseDir:-.}/$meshDir" 1>&2

for i in \
    points \
    faces \
    owner \
    neighbour \
    cells \
    boundary \
    pointZones \
    faceZones \
    cellZones \
    meshModifiers \
    parallelData \
    sets \
    cellLevel \
    pointLevel \
    refinementHistory \
    surfaceIndex \
    points.gz \
    faces.gz \
    owner.gz \
    neighbour.gz \
    cells.gz \
    boundary.gz \
    pointZones.gz \
    faceZones.gz \
    cellZones.gz \
    meshModifiers.gz \
    parallelData.gz \
    sets.gz \
    cellLevel.gz \
    pointLevel.gz \
    refinementHistory.gz \
    surfaceIndex.gz \
;
do
    rm -rf $meshDir/$i
done

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