File: have_metis

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#----------------------------------*-sh-*--------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2018 OpenCFD Ltd.
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, licensed under GNU General Public License
#     <http://www.gnu.org/licenses/>.
#
# Script
#     have_metis
#
# Description
#     Detection/setup of metis
#
# Requires
#     config.sh/metis
#
# Functions provided
#     have_metis, no_metis, echo_metis
#
# Variables set on success
#     HAVE_METIS
#     METIS_ARCH_PATH
#     METIS_INC_DIR
#     METIS_LIB_DIR
#
#------------------------------------------------------------------------------
. $WM_PROJECT_DIR/wmake/scripts/sysFunctions # General system functions

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

# Reset variables
no_metis()
{
    unset HAVE_METIS METIS_ARCH_PATH METIS_INC_DIR METIS_LIB_DIR
    unset METIS_VERSION
    return 0
}


# Report
echo_metis()
{
    echo "metis=${HAVE_METIS:-false}"
    echo "root=$METIS_ARCH_PATH"
    echo "include=$METIS_INC_DIR"
    echo "library=$METIS_LIB_DIR"
}


# On success, return 0 and export variables
# -> HAVE_METIS, METIS_ARCH_PATH, METIS_INC_DIR, METIS_LIB_DIR
have_metis()
{
    local header library static label settings warn
    warn="==> skip metis"

    # Basic setup/checks
    settings=$($WM_PROJECT_DIR/bin/foamEtcFile config.sh/metis) || {
        [ -n "$warn" ] && echo "$warn (no config.sh/metis settings)"
        return 1
    }
    . $settings
    if isNone "$METIS_ARCH_PATH"
    then
        [ -n "$warn" ] && echo "$warn (not available)"
        return 1
    fi


    # Header/library names
    header="metis.h"
    library="libmetis$extLibso"
    static="libmetis$extLiba"


    if hasAbsdir "$METIS_ARCH_PATH"
    then
        header=$(findFirstFile $METIS_ARCH_PATH/include/$header)

        library=$(findFirstFile \
            "$(thirdExtLib $library)" \
            $METIS_ARCH_PATH/lib/$static \
            $METIS_ARCH_PATH/lib/$library \
            $METIS_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH/$static \
            $METIS_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH/$library \
        )
    elif isSystem "$METIS_ARCH_PATH"
    then
        header=$(findFirstFile /usr/local/include/$header /usr/include/$header)

        case "$header" in
        /usr/local/*)
            library=$(findFirstFile \
                /usr/local/lib/$library \
                /usr/local/lib$WM_COMPILER_LIB_ARCH/$library \
            )
            ;;

        *)
            library=$(findFirstFile \
                /usr/lib/$library \
                /usr/lib$WM_COMPILER_LIB_ARCH/$library \
            )
            ;;
        esac
    else
        unset header library
    fi


    # Header found?
    [ -n "$header" ] || {
        [ -n "$warn" ] && echo "$warn (no header)"
        return 2
    }

    # Library found?
    [ -n "$library" ] || {
        [ -n "$warn" ] && echo "$warn (missing library)"
        return 2
    }


    # Ensure consistent sizes between OpenFOAM and metis header
    # Extract IDXTYPEWIDTH from metis.h: regex as per ThirdParty Allwmake
    label=$(sed -ne 's/^.*#define  *IDXTYPEWIDTH  *\([1-9][0-9]\).*/\1/p' $header)
    : ${label:=unknown}

    if [ "$WM_LABEL_SIZE" = "$label" ]
    then
        echo "Metis (label=$label) - $METIS_ARCH_PATH"
        export HAVE_METIS=true
        export METIS_ARCH_PATH
        export METIS_INC_DIR="${header%/*}"     # Basename
        export METIS_LIB_DIR="${library%/*}"    # Basename
    else
        if [ -n "$warn" ]
        then
            echo "$warn (label=$WM_LABEL_SIZE, metis.h has '$label')"
        fi
        no_metis
        return 1
    fi
}


# Force reset of old variables
no_metis

# Testing
if [ "$1" = "-test" ]
then
    have_metis
    echo_metis
fi

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