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yap-6.3/Logtalk/INSTALL.txt

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================================================================
Logtalk - Open source object-oriented logic programming language
Release 2.30.2
Copyright (c) 1998-2007 Paulo Moura. All Rights Reserved.
================================================================
The recommended way of installing Logtalk is to use, whenever possible, one
of the provided installers. This file contains detailed instructions for
manual installation and configuration of Logtalk. You should also consult
the "scripts/NOTES.txt" and "integration/NOTES.txt" files for a description
of a set of shell scripts that might be used for Logtalk installation on
some operating-systems and for easy Logtalk integration with popular Prolog
compilers.
Note that the broad compatibility of Logtalk, both with Prolog compilers and
operating-systems, together with all the possible user scenarios, means that
installation can vary from very simple by running a couple of scripts to the
need of patching both Logtalk and Prolog compilers to workaround the lack of
strong Prolog standards.
1. LOGTALK BASIC INSTALLATION
Installing Logtalk can be as simple as decompressing the downloaded archive
and copying the resulting directory to a suitable location. This location
depends on the working environment and on the number of users. The Logtalk
directory can reside in any user accessible location. Whenever possible, it
is recommended that Logtalk be installed by a user with administrative rights,
as described below. This leads to a setup where each Logtalk user may freely
try and modify the provided examples, library, and configuration files with
the option of, at any time, restoring the files to its original state by
simply running one of the provided scripts.
* Installing for a single user with no administrative rights:
In the case of a single user with no administrative rights, the Logtalk
directory may simply be copied to the user home directory.
* Installing for one or more users by a user with administrative rights:
In the case of installation by a user with administrative rights, the Logtalk
directory can be copied to any location that its accessible by all the users
(assuming that copying the Logtalk directory to each user home directory is,
for some reason, not feasible or desired).
The "scripts" sub-directory contains shell scripts for easy installation of
Logtalk on POSIX operating systems (see the "scripts/NOTES.txt" file for
details). Starting from the Logtalk directory, type:
% cd scripts
% sudo ./install.sh
This installation script makes all files read-only for non-admin users in
order to avoid user tempering. This is a convenient setup for computer labs,
given that making directories world-writable is a security risk.
2. SETTING LOGTALK ENVIRONMENT VARIABLES
You need to set two environment variables, LOGTALKHOME and LOGTALKUSER. The
environment variable LOGTALKHOME should be set to the Logtalk installation
directory. The environment variable LOGTALKUSER should point to a directory
in your home directory where you want to store the user-specific Logtalk files
(by default, ~/logtalk). Both environment variables may be set for all users
by a user with administration privileges. The two environment variables can
have the same value if you are the only Logtalk user on your computer and if
you have full permissions to the Logtalk installation directory. In addition,
you may want to add the Logtalk sub-directory "xml", which contains useful
scripts for processing XML documenting files, to your execution path.
>> POSIX systems:
If you use a csh shell, add the following line to your ~/.cshrc file:
setenv LOGTALKHOME /your/logtalk/installation/directory
setenv LOGTALKUSER $HOME/logtalk
setenv PATH $PATH:$LOGTALKHOME/xml:$LOGTALKHOME/scripts
If you use a bash shell, add the following lines to your ~/.profile file:
LOGTALKHOME=/your/logtalk/installation/directory
LOGTALKUSER=$HOME/logtalk
PATH=$PATH:$LOGTALKHOME/xml:$LOGTALKHOME/scripts
export PATH LOGTALKHOME LOGTALKUSER
When using the provided shell script for installing Logtalk, a symbolic link
to the Logtalk installation directory is automatically created. The link is
named "logtalk". In this case, you may use this symbolic link to define the
LOGTALKHOME environment variable in order to avoid breaking it when upgrading
Logtalk.
>> Windows systems:
In Windows 2000/XP, environment variables are defined using the System
properties control panel. If you are a system administrator, the Windows
GUI installer sets the LOGTALKHOME environment variable for all users and
also sets the LOGTALKUSER environment variable for the administrator user
running the installer.
3. END-USER SETUP (COPYING LOGTALK USER-MODIFIABLE FILES TO USERS HOME DIRS)
If you installed Logtalk on your home directory, then skip this step if you
have set both Logtalk environment variables (LOGTALKHOME and LOGTALKUSER) to
point to the same directory.
Each user must make a local copy of the Logtalk user-modifiable files to its
home directory. This setup allows each user to easily and independently
customize Logtalk to its needs. These copies can be easily made by instructing
end-users to simply run the shell scripts "cplgtdirs.*" (which are described
in the "scripts/NOTES.txt" file).
>> POSIX systems:
% cplgtdirs
>> Windows:
C:\> cplgtdirs
The local copies made by the "cplgtdirs" scripts have both read and write
permissions for the user running the script. When used with one of the
back-end Prolog compilers for which an integration script is provided on
the "integration" directory, this setup as the advantage of allowing each
end-user to independently customize default compilation options and library
paths.
Windows (non-admin) users may also use the Logtalk GUI installer to setup
their Logtalk user folder and the LOGTALKUSER environment variable.
4. CREATING NEW PROLOG TOP-LEVELS FOR AUTOMATIC LOADING OF LOGTALK
Most Prolog compilers allows the user to define an initialization file
that is automatically consulted at startup. These initialization files
may contain directives for loading other files, such as the Logtalk
configuration file and the Logtalk compiler. The "$LOGTALKHOME/integration"
sub-directory contains several pre-made scripts (named "*lgt.*") for running
Logtalk with selected back-end Prolog compilers. You can use these scripts
as examples when creating initialization files for other Prolog compilers.
Be sure to read the "configs/NOTES.txt" file notes on the Prolog compilers
that you intend to use. You may also simply follow the steps described in
the "QUICK_START.txt" file.
5. CUSTOMIZING LOGTALK
Please see the file "CUSTOMIZE.txt" for details on how to customize your
Logtalk installation and working environment.