On Mon, May 11, 2020 at 12:40:05AM -0700, ToddAndMargo via perl6-users wrote: > On 2020-05-10 23:47, Peter Pentchev wrote: > > On Sun, May 10, 2020 at 06:20:02PM -0700, ToddAndMargo via perl6-users > > wrote: > > > Hi All, > > > > > > https://modules.raku.org/dist/Getopt::Long:cpan:LEONT > > > > > > How do I handle stray entries (unknown options) without > > > crashing? Is there some grab bag I can stick all > > > those into? > > > > When something signals an error using "die", you can catch it > > using a CATCH block, especially if you know that the exception > > thrown will be of a particular type. Now, the Getopt::Long > > documentation does not explicitly mention it, but the module does > > indeed define its own exception type, so you can do something > > like this: > > > > use v6.d; > > use Getopt::Long; > > get-options('length=i' => my $length); > > CATCH { when Getopt::Long::Exception { .message.note; exit 1 } }; > > if defined $length { > > say "Whee, length is $length"; > > } else { > > say 'No length specified'; > > } > > > > The "when" condition within the CATCH block will make it only handle > > these exceptions; any other errors will be handled (or passed through) in > > their own way. > > > > For more information about exceptions, see the documentation at > > https://docs.raku.org/language/exceptions > > > > G'luck, > > Peter > > > > I was actually hope to pick up the extra entries and use them > > programname.pl6 --abc def ghi > > I wanted to pick up ghi and use it
If "ghi" is not an option or an argument to an option, then I believe that Getopt::Long, like similar modules in other languages, will just leave it in @ARGV. > I also wanted to pick up an extra pair not on the list > (unknown option) and complain about them to the user Well, it seems that Getopt::Long's exceptions are not quite that detailed for the moment. It could be done though, the module could be touched up a little bit so that there are different exceptions for different problems encountered, and some of them contained additional details... but that's up to the author or to whoever decides to fork and extend the module :) G'luck, Peter -- Peter Pentchev r...@ringlet.net r...@debian.org p...@storpool.com PGP key: http://people.FreeBSD.org/~roam/roam.key.asc Key fingerprint 2EE7 A7A5 17FC 124C F115 C354 651E EFB0 2527 DF13
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