#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2019 OpenCFD Ltd.
#    \\/     M anipulation  |
#-------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, licensed under GNU General Public License
#     <http://www.gnu.org/licenses/>.
#
# Script
#     wrap-lemon
#
# Usage
#     wrap-lemon [lemon-options]
#
# Description
#     A wrapper to use lemon compiled with OpenFOAM with the appropriate
#     parser template.
#
#------------------------------------------------------------------------------

binDir="${WMAKE_BIN:-$WM_PROJECT_DIR/wmake/platforms/$WM_ARCH$WM_COMPILER}"
etcDir="${WM_DIR:-$WM_PROJECT_DIR/wmake}/etc"

# Executable and skeleton locations
lemon="$binDir/lemon"
skel="-T${etcDir}/lempar.c"

usage() {
    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    cat<<USAGE

Usage: ${0##*/} [options] [lemon args/options]

options:
  -header           Generate header only, suppressing other output
  -h, -help         Print the usage

A lemon wrapper using predefined executable and skeleton locations

USAGE
    exit 1
}

#------------------------------------------------------------------------------
# Parse arguments and options
#------------------------------------------------------------------------------

# wrap-lemon -header-only
unset optHeader
while [ "$#" -gt 0 ]
do
    case "$1" in
    (-h | -help*) usage ;;

    (-header*)    optHeader=true ;;

    (*) break ;;
    esac
    shift
done


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

# No special handling
if [ -z "$optHeader" ]
then
    "$lemon" "$skel" $*
    exit $?
fi


# Header only, which means we create a temp directory for the output
tmpDir="lemonWrapper-$$"
rm -rf "$tmpDir" 2>/dev/null
mkdir "$tmpDir" 2>/dev/null

# DO WE WANT THIS?
# trap 'rm -f $tmpDir 2>/dev/null; exit $rc' EXIT TERM INT

"$lemon" "$skel" "-d$tmpDir" $*
rc=$?

for src in "$tmpDir"/*.h
do
    dst="${src##*/}"
    if [ -f "$src" ]
    then
        if ! cmp "$src" "$dst" 2>/dev/null
        then
            mv "$src" "$dst"
            echo "Updating $dst" 1>&2
        fi
    fi
done

rm -rf "$tmpDir" 2>/dev/null
exit "$rc"   # Exit with lemon return code

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