#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | www.openfoam.com
#    \\/     M anipulation  |
#-------------------------------------------------------------------------------
#     Copyright (C) 2011-2016 OpenFOAM Foundation
#     Copyright (C) 2022 OpenCFD Ltd.
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, distributed under GPL-3.0-or-later.
#
# Script
#     foamCleanPolyMesh
#
# Description
#    Remove the contents of the constant/polyMesh directory
#    as per the Foam::polyMesh::removeFiles() method.
#
#------------------------------------------------------------------------------
usage() {
    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    cat <<USAGE

Usage: ${0##*/} [OPTION]
options:
  -case <dir>       specify alternative case directory, default is the cwd
  -region <name>    specify alternative mesh region
  -help             print the usage

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

meshDir=polyMesh
if [ -n "$regionName" ]
then
    meshDir="$regionName/$meshDir"
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 [ "${PWD##*/}" = polyMesh ] && [ -z "$regionName" ]
    then
        # Apparently already within polyMesh/
        meshDir=.
    fi
fi


# Remove files (mesh itself, modifiers, snappyHexMesh ones) and subdirectories
# also remove .gz versions of the same files
echo "Cleaning ${caseDir:-.}/$meshDir" 1>&2

for i in \
    points \
    faces \
    owner \
    neighbour \
    cells \
    boundary \
    pointZones \
    faceZones \
    cellZones \
    meshModifiers \
    parallelData \
    sets \
    cellLevel \
    pointLevel \
    level0Edge \
    refinementHistory \
    surfaceIndex \
;
do
    rm -rf "$meshDir/$i" "$meshDir/$i.gz"
done

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