On Wed, Apr 27, 2022 at 7:29 PM yary wrote:
> It's like the "where" clause has its own signature-like list of types it will
> accept. When the where clause uses the default topic "$_" then that topic has
> no constraint, and MAIN can probe if "--dir=something" should be interpreted
> as a flag
I just read through https://github.com/rakudo/rakudo/issues/4878 and I had
a thought.
It's like the "where" clause has its own signature-like list of types
it will accept. When the where clause uses the default topic "$_" then that
topic has no constraint, and MAIN can probe if "--dir=something" s
On Fri, Apr 15, 2022 at 4:15 PM yary wrote:
>
> Here's how I ended up handling input arg validation, with meaningful error
> messages, as part of a Perl Weekly Challenge a couple years ago. It looks
> almost the same as Luca's original, except mine uses "die" instead of "warn",
> which means it
Here's how I ended up handling input arg validation, with meaningful error
messages, as part of a Perl Weekly Challenge a couple years ago. It looks
almost the same as Luca's original, except mine uses "die" instead of
"warn", which means it won't attempt to continue once it encounters a bad
arg.
Works (𝐑𝐚𝐤𝐮𝐝𝐨™ v2021.06):
admin@mbook:~$ raku Luca_Ferrari2.p6
Usage:
Luca_Ferrari2.p6 [--dir=]
admin@mbook:~$ raku Luca_Ferrari2.p6 --dir=foo
foo
But...warning "Specify the directory [$dir]" isn't printing when
`--dir=foo` is omitted.
HTH, Bill.
On Tue, Apr 12, 2022 at 1:23 AM Luca Ferrari
Fails on 𝐑𝐚𝐤𝐮𝐝𝐨™ v2021.06.
~$ raku Luca_Ferrari.p6
Use of uninitialized value of type Any in string context.
Methods .^name, .raku, .gist, or .say can be used to stringify it to
something meaningful.
in block at Luca_Ferrari.p6 line 1
Specify the
directory []
in block at Luca_Ferrari.p6 line
On Tue, Apr 12, 2022 at 10:15 AM Luca Ferrari wrote:
>
> Hello all,
> given this simple program:
>
> sub MAIN( Str :$dir where { .so && .IO.d // warn "Specify the
> directory [$dir]" } ) {
> say $dir;
> }
>
Shame on me: it works if I omit the topic and substitute it with the
explicit variable
Hello all,
given this simple program:
sub MAIN( Str :$dir where { .so && .IO.d // warn "Specify the
directory [$dir]" } ) {
say $dir;
}
it works as I expect on ancient versions of rakudo, e.g., 202-01, but
it fails miserably on current rakudo:
% raku ~/tmp/test.p6 --dir=foo
Use of uninitiali
