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Pack logtalk -- README.md

This file is part of Logtalk https://logtalk.org/ SPDX-FileCopyrightText: 1998-2023 Paulo Moura <pmoura@logtalk.org> SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at


Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. ________________________________________________________________________

This is a SWI-Prolog pack specific README file. The actual Logtalk README file can be found at `../logtalk-3.75.0/README.md`. Follows some notes on this pack version of Logtalk.

The pack version of Logtalk is mainly targeted for specific application deployment scenarios. For development, using one of the installers available from the Logtalk website is strongly advised for a much better user experience.

Installing this pack simplifies loading Logtalk on-demand by simply using the directive (or the corresponding query):

:- use_module(library(logtalk)).

Note, however, that Logtalk is not packaged as a module and that the logtalk module provided contains just an initialization directive that loads Logtalk in exactly the same way as when Logtalk is installed using one of its prebuilt installers.

When using the directive above, the LOGTALKHOME and LOGTALKUSER shell environment variables are set, just for the duration of the SWI-Prolog process, to the full path of the `../logtalk-3.75.0` directory.

For easy access to the contents of the Logtalk installation folder (e.g. documentation or examples) you can create a symbolic link to the `../logtalk-3.75.0` directory (in e.g. your home directory). Its full path can be easily found by using the query:

?- pack_info(logtalk).

The `../logtalk-3.75.0` directory contains a settings.lgt file that makes loading of Logtalk silent. If you make other changes to this file, or to other contents of the `../logtalk-3.75.0` directory, be sure to make a backup before upgrading or removing this pack.

The `../logtalk-3.75.0` directory contains several handy scripts but due to a limitation of the archive library in SWI-Prolog 7.3.28 and older versions used for extracting the pack files, the executable permission of the script files was not preserved. If you're not running SWI-Prolog 7.3.29 or a later version, this issue can be manually fixed after installing the pack using the following steps (adjust the logtalk-3.75.0 directory full path if necessary for your installation):

$ cd $HOME/lib/swipl/pack/logtalk/logtalk-3.75.0
$ chmod a+x scripts/cleandist.sh
$ ./scripts/cleandist.sh