> On Jun 11, 2019, at 5:39 PM, ToddAndMargo via perl6-users
> <perl6-us...@perl.org> wrote:
>
> Hi All,
>
> I need one liner help importing a module sub
>
> This works:
>
> perl6 -e 'use lib "/home/linuxutil/p6lib"; use PrintColors :PrintBlue;
> PrintBlue( "Blue\n" );'
>
> Blue
>
>
>
> This does not:
>
> perl6 -I /home/linuxutil/p6lib -M "PrintColors :PrintBlue" -e 'PrintBlue(
> "Blue\n" );'
>
> Could not find PrintColors :PrintBlue at line 1 in:
>
>
>
> What did I do wrong, this time?
>
> Many thanks,
> -T
Results of my research:
In Perl 5, the code to use a module *and* select its imports,
use This::Module qw<foo bar>;
can rephrased in a one-liner as:
-MThis::Module=foo,bar
The Perl 6 docs show a one-liner option for `use`:
-M This::Module
, but shows no version that lets you select the import.
In src/Perl6/World.nqp, method do_pragma_or_load_module has code to start
'Performing imports' right after loading the module.
(you can see the progress by setting RAKUDO_MODULE_DEBUG, as in
`RAKUDO_MODULE_DEBUG=1 perl6 -MTest -e 'say 42'`)
I see no tests exercising this part of the code, and when I experiment, any
deviation I can think to try from `-M FooModule` results in failure in
self.load_module, as whatever should recognize some divider between ModuleName
and ModuleImportList fails to do so, so `-MFoo=Bar` tries to load a module with
the 7-char name "Foo=Bar".
Based on the call to `self.do_import`, I think that Rakudo is intended to
support something like `-MThis::Module=foo,bar`, but I cannot tell what exact
form the import separator should take, so cannot tell if we are just missing
the correct syntax, or if there is a bug in Rakudo.
Either way, there are docs and tests that need to be added.
EOUTOFTIME, this email stands alone, no bugs filed.
—
Bruce Gray (Util of PerlMonks)
