main.pl -- Provide entry point for scripts

This library is intended for supporting PrologScript on Unix using the #! magic sequence for scripts using commandline options. The entry point main/0 calls the user-supplied predicate main/1 passing a list of commandline options. Below is `echo' in Prolog (adjust /usr/bin/swipl to where SWI-Prolog is installed)

#!/usr/bin/env swipl

:- initialization(main, main).

main(Argv) :-
        echo(Argv).

echo([]) :- nl.
echo([Last]) :- !,
        write(Last), nl.
echo([H|T]) :-
        write(H), write(' '),
        echo(T).

See also

- XPCE users should have a look at library(pce_main), which starts the GUI and processes events until all windows have gone.

 main

Call main/1 using the passed command-line arguments. Before calling main/1 this predicate installs a signal handler for SIGINT (Control-C) that terminates the process with status 1.

Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 argv_options(Arg1, Arg2, Arg3)