#!/bin/sh

## =================================================================
## Logtalk - Object oriented extension to Prolog
## Release 2.26.2
##
## Copyright (c) 1998-2005 Paulo Moura.  All Rights Reserved.
## =================================================================

echo
echo "Creating a script named swilgt for running Logtalk with SWI-Prolog..."
echo

if ! [ "$LOGTALKHOME" ]
then
	echo "The environment variable LOGTALKHOME must be defined first!"
	echo
	exit 1
fi

if ! [ -d "$LOGTALKHOME" ]; then
	echo "The environment variable LOGTALKHOME points to a non-existing directory!"
	echo "Its current value is: $LOGTALKHOME"
	echo "The variable must be set to your Logtalk installation directory!"
	echo
	exit 1
fi

if [ -z "$1" ]; then
	prefix=/usr/local
else
	prefix="$1"
fi

if ! [ -d "$prefix" ]; then
	echo "Directory prefix does not exist!"
	echo
	exit 1
fi

cd "$LOGTALKHOME"
mkdir -p bin
cd bin
echo ":- system_module." > logtalk_swi.pl
cat ../compiler/logtalk.pl >> logtalk_swi.pl
echo ":- consult('\$LOGTALKUSER/configs/swi.config')." > logtalk_swi.rc
echo ":- consult('\$LOGTALKUSER/configs/swihook.pl')." >> logtalk_swi.rc
echo ":- consult('\$LOGTALKHOME/bin/logtalk_swi.pl')." >> logtalk_swi.rc
echo ":- consult('\$LOGTALKUSER/libpaths/libpaths.pl')." >> logtalk_swi.rc
echo "#/bin/sh" > swilgt
case $( uname -s ) in
	Darwin	) echo "swipl -f \$LOGTALKHOME/bin/logtalk_swi.rc" >> swilgt;;
	*		) echo "pl -f \$LOGTALKHOME/bin/logtalk_swi.rc" >> swilgt;;
esac
chmod a+x swilgt
ln -sf $LOGTALKHOME/bin/swilgt $prefix/bin/swilgt
echo "Done. A link to the script was been created in $prefix/bin."
echo "Users must define the environment variables LOGTALKHOME and"
echo "LOGTALKUSER in order to use the script."
echo