Re: Warning: argument option processing changes

Hello,

Is this section of the manual still correct:

http://www.swi-prolog.org/pldoc/man?section=plscript

In particular, is it still possible to have a file (hello.pl) like this:

#!/path/to/swipl -q -t main -f
main :- format('hello world~n'), halt.

which can then be run with
$ ./hello.pl
(right now Prolog gives me back the help message when I try this)

Reading the email above I understand that this shouldn't be used / is
wrong, because of the multiple options passed. However, the email also
talks about script files, starting with header #! line, but what is it
for if I can drop the #! header altogether and run:
$ swipl -q -t main -f hello.pl

Thank you,
Boris


On Mon, Aug 19, 2013 at 10:49 PM, Jan Wielemaker <[email protected]> wrote:
> Hi,
>
> Prolog can be started in many ways and the new stuff around Carlo's
> console and the Mac makes it even more complicated.  I spent most of
> the day sorting out command line processing.  Pushed the changed,
> which introduces some INCOMPATIBLE changes.  It does improve
> compatibility with some other systems though.  Outline:
>
>  - The Prolog flag =argv= now only provides `user arguments'.  I.e.,
>    arguments processed by Prolog are not there.  This is compatible
>    with at least YAP and SICStus.   All arguments are still available
>    with the new flag =os_argv=.
>
>  - I removed all stuff trying to be clever with arguments from #!
>    scripts.  Most of this didn't work anyway, leading to all sorts
>    of hard to debug platform dependent surprises.  This concretely
>    means that options in #! under Windows have no meaning.  On
>    Unix systems, only #!/path-to-executable [option] (using only
>    one option) is (AFAIK) fully portable.
>
>    Anything that can be handled using options can be handled with
>    directives these days, so functionality-wise nothing changes.
>
>  - swipl [option ...] prolog-file ... loads the given Prolog files
>    (extensions .pl and .qlf; this is processed *before* ~/.plrc).
>
>  - swipl [option ...] script-file arg ... processes script-file and
>    passes the remaining options in the flag argv.  A script file
>    is a file with any extension that starts with #!
>
> Updated all packages.  Also updated ClioPatria to deal with this.
>
> Sorry for the inconvenience.  Notably the change of the =argv=
> flag will force changing some programs.  I think this was
> unavoidable, considering established practice.
>
> If you see opportunities to further simplify things or reduce
> compatibility impact, let me know.
>
>         Cheers --- Jan
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