File: have_readline

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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_readline
#
# Description
#     Detection/setup of readline
#
# Requires
#     None
#
# Functions provided
#     have_readline, no_readline, echo_readline
#
# Variables set on success
#     HAVE_LIBREADLINE - as per GNU autoconf
#     READLINE_INC_DIR
#     READLINE_LIB_DIR
#
#------------------------------------------------------------------------------
. $WM_PROJECT_DIR/wmake/scripts/sysFunctions # General system functions

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

# Reset variables
no_readline()
{
    unset HAVE_LIBREADLINE READLINE_INC_DIR READLINE_LIB_DIR
    return 0
}


# Report
echo_readline()
{
    echo "readline=${HAVE_LIBREADLINE:-false}"
    echo "include=$READLINE_INC_DIR"
    echo "library=$READLINE_LIB_DIR"
}


# On success, return 0 and export variables
# -> HAVE_LIBREADLINE, READLINE_INC_DIR, READLINE_LIB_DIR
have_readline()
{
    local header library static settings warn
    # warn="==> skip readline"


    # Header/library names
    header="readline/readline.h"
    library="libreadline$extLibso"

    # System only?
    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

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

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

    header="${header%/*}"     # Strip one-level (include/readline/...)

    export HAVE_LIBREADLINE=true
    export READLINE_INC_DIR="${header%/*}"     # Basename
    export READLINE_LIB_DIR="${library%/*}"    # Basename
}


# Force reset of old variables
no_readline

# Testing
if [ "$1" = "-test" ]
then
    have_readline
    echo_readline
fi

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