Using commandline arguments (see section 2.4), SWI-Prolog can be forced to load files and execute queries for initialisation purposes or non-interactive operation. The most commonly used options are -f file or -s file to make Prolog load a file, -g goal to define an initialisation goal and -t goal to define the toplevel goal. The following is a typical example for starting an application directly from the commandline.
machine% pl -s load.pl -g go -t halt |
It tells SWI-Prolog to load load.pl, start the
application using the entry-point go/0
and ---instead of entering the interactive toplevel--- exit after
completing go/0. The -q
may be used to supress all informational messages.
In MS-Windows, the same can be achieved using a short-cut with
appropriately defined commandline arguments. A typically seen
alternative is to write a file run.pl with content as
illustrated below. Double-clicking run.pl will start the
application.
:- [load]. % load program :- go. % run it :- halt. % and exit |
Section 2.10.2.1 discusses further scripting options and chapter 8 discusses the generation of runtime executables. Runtime executables are a mean to deliver executables that do not require the Prolog system.