2011-06-13 01:42:45 +01:00
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/* $Id$
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Part of SWI-Prolog
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Author: Jan Wielemaker
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E-mail: J.Wielemaker@cs.vu.nl
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WWW: http://www.swi-prolog.org
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Copyright (C): 1985-2011, University of Amsterdam
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VU University Amsterdam
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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As a special exception, if you link this library with other files,
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compiled with a Free Software compiler, to produce an executable, this
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library does not by itself cause the resulting executable to be covered
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by the GNU General Public License. This exception does not however
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invalidate any other reasons why the executable file might be covered by
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the GNU General Public License.
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*/
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:- module(prolog_main,
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[ main/0
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]).
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:- use_module(library(lists)).
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/** <module> Provide entry point for scripts
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2015-01-04 23:58:23 +00:00
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@ingroup swi
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2011-06-13 01:42:45 +01:00
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This library is intended for supporting PrologScript on Unix using the
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=|#!|= magic sequence for scripts using commandline options. The entry
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point main/0 calls the user-supplied predicate main/1 passing a list of
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commandline options. Below is `echo' in Prolog (adjust /usr/bin/pl to
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where SWI-Prolog is installed)
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==
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#!/usr/bin/pl -q -g main -s
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main(Argv) :-
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echo(Argv).
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echo([]) :- nl.
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echo([Last]) :- !,
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write(Last), nl.
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echo([H|T]) :-
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write(H), write(' '),
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echo(T).
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==
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@see XPCE users should have a look at library(pce_main), which
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starts the GUI and processes events until all windows have gone.
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*/
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:- module_transparent
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main/0.
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%% main
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%
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% Call main/1 using the passed command-line arguments.
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main :-
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context_module(M),
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set_signals,
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argv(Av),
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run_main(M, Av).
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%% run_main(+Module, +Args)
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%
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% Run the main routine, guarding for exceptions and failure of the
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% main/1 routine
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run_main(Module, Av) :-
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( catch(call(Module:main, Av), E, true)
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-> ( var(E)
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-> halt(0)
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; print_message(error, E),
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halt(1)
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)
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; print_message(error, goal_failed(main(Av))),
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halt(1)
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).
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argv(Av) :-
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current_prolog_flag(argv, Argv),
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( append(_, [--|Av], Argv)
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-> true
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; current_prolog_flag(dialect, yap)
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-> Argv = Av
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; current_prolog_flag(windows, true)
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-> Argv = [_Prog|Av]
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; Av = []
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).
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set_signals :-
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on_signal(int, _, interrupt).
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%% interrupt(+Signal)
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%
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% We received an interrupt. This handler is installed using
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% on_signal/3.
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interrupt(_Sig) :-
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halt(1).
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