#----------------------------------*-sh-*--------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2018-2019 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 prefix header library incName libName settings warn
    # warn="==> skip readline"

    # Expected location, include/library names
    prefix=system
    incName="readline/readline.h"
    libName="libreadline"

    # ----------------------------------
    if isNone "$prefix"
    then
        [ -n "$warn" ] && echo "$warn (disabled)"
        return 1
    elif hasAbsdir "$prefix"
    then
        header=$(findFirstFile "$prefix/include/$incName")
        library="$(findExtLib $libName)"
    elif isSystem "$prefix"
    then
        header=$(findFirstFile "/usr/local/include/$incName" "/usr/include/$incName")
        prefix=$(sysPrefix "$header")
    else
        unset prefix
    fi
    # ----------------------------------

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

    # Library
    [ -n "$library" ] || library=$(findLibrary \
        "$prefix/lib/$libName" \
        "$prefix/lib$WM_COMPILER_LIB_ARCH/$libName" \
    ) || {
        [ -n "$warn" ] && echo "$warn (no library)"
        return 2
    }

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

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

    # OK
    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

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