
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).
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.