#!/bin/sh
#
############################################################################
#
# MODULE:       r.mapcalc_wrapper 
# AUTHOR(S):    Martin Landa <landa.martin gmail.com>
# PURPOSE:      Simulate standard g.parser interface for GUI
# COPYRIGHT:    (C) 2011 by The GRASS Development Team
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
############################################################################

#%module
#% description: Raster map calculator.
#% keywords: raster, algebra
#%end
#%option
#% key: expression
#% type: string
#% required: no
#% multiple: no
#% description: Expression to evaluate
#% guisection: Expression
#%end
#%option
#% key: file
#% type: string
#% required: no
#% multiple: no
#% key_desc: name
#% description: File containing expression(s) to evaluate
#% gisprompt: old_file,file,input
#% guisection: Expression
#%end

if  [ -z "$GISBASE" ] ; then
   echo "You must be in GRASS GIS to run this program." 1>&2
   exit 1
fi

if [ "$1" != "@ARGS_PARSED@" ] ; then
   exec g.parser "$0" "$@"
fi

if [ -n "$GIS_OPT_FILE" ] ; then
    exec r.mapcalc < "$GIS_OPT_FILE"
else
    if [ -n "$GIS_OPT_EXPRESSION" ] ; then
	exec r.mapcalc "$GIS_OPT_EXPRESSION"
    else
	exec g.message -e message="Either <expression> or <file> option must be given"
	exit 1
    fi
fi

exit 0