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and finally you can include it in your program to start tracing at a particular point or under a particular condition: Alternatively it can be used in conjunction with the goal to be debugged: ?- trace, run. Entered as a single goal at the top-level, the next query will be traced. Normally used after editing one or more files.
Reload all files that have been changed since they where last loaded. If multiple items are named Spec it prompts for the desired alternative. Also available from the menu.Įdit file, predicate, module, etc. Load from the current folder (see pwd/0). A Prolog list () can be used to abbreviate the consult command. This section provides a very brief overview of important or commonly used SWI-Prolog predicates to control the environment. or can be set as default editor in the personalisation file. It is started using the command ?- emacs. This editor provides colourisation support based on real-time parsing and cross-reference analysis of the program. A commented template is in the directory dotfiles of the SWI-Prolog installation directory.įinally, you may wish to use the built-in editor called PceEmacs. This is achieved by editing the personalisation file /.plrc. In addition to this option Prolog can be used to locate predicates, modules and loaded files by specifying the editor of choice for use with the edit/1 command described below.
One is to run an editor of choice in a separate window and use the below described make/0 command to reload modified files. Finally, Prolog can answer using an error message to indicate the query or program contains an error. If Prolog answers No, it indicates it cannot find any (more) answers to the query. The user can type the semi-colon ( ) 2 if (s)he wants another solution, or RETURN if (s)he is satisfied, after which Prolog will say Yes. The system responds with X = if it can prove the goal for a certain X. The query below asks Prolog what food `sam’ likes. Below we load the file from the demo directory in the installation directory, Be sure to get the quotes right and terminate the command with a full-stop (.).Īfter loading a program, one can ask Prolog queries about the program. Two defined paths are library for the Prolog library and swi for the Prolog installation directory. In addition to a plain filename, files may be searched on a named search-path 1 using the notation SearchPath(File). Prolog source files can be loaded by specifying their filename between.
If X11 is properly configured, the help system of the graphics subsystem XPCE can now be started using the command below.
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This is free software,Īnd you are welcome to redistribute it under certain conditions.įor help, use ?- help(Topic). SWI-Prolog comes with ABSOLUTELY NO WARRANTY. Welcome to SWI-Prolog (Multi-threaded, Version 5.6.0)Ĭopyright (c) 1990-2006 University of Amsterdam. Now start X11.App and configure it to autostart at login. # This allows using Prolog graphics if you use Terminal.app Add the following lines to the file ~/.bashrc (or create this file if it does not yet exist). The procedure depends on your shell of choice. For comfortable usage it is necessary to setup some environment variables. This can either be an X11 xterm or Terminal.app from Utilities. Not being a Macintosh Application, SWI-Prolog must be started from a terminal window. The programs are installed in the directory /opt/local/bin. Opening and installing the meta installer installs the required ports from the MacPorts system. The swi-prolog port depends on readline, ncurses, ncursesw, gmp libmcrypt, zlib, expat, and jpeg. % sudo port -v selfupdate # make sure we have the latest portfiles In addition to the port named swi-prolog providing the stable version, there is a port called swi-prolog-devel providing the development version.
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Users of the MacPorts system can install the system just like any port using the command below. The installer can be downloaded from the XQuartz web site. XQuartz should be installed prior to SWI-Prolog installation.
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It has been brought to the Mac using the MacPorts project, using XQuartz (Macintosh X11) for its graphical capabilities. SWI-Prolog is by origin an Unix application, and not a native Macintosh application.
#Xquartz macosforge org landing pdf
The reference manual is available online or can be downloaded in HTML and PDF format from the SWI-Prolog website, which also provides links to books, online tutorials and other Prolog related material.Ħ The SWI-Prolog community and foundation This is by no means a manual or Prolog tutorial. This document briefly explains the MacOS X specific issues for SWI-Prolog. SWI-Prolog for MacOS X from: Installation Screen but its nice to read it in advance
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