use utf8 pragma with moo

AlexP has asked for the wisdom of the Perl Monks concerning the following question:

Hi monks!
I decided to dive into Moo and found that it's not necessary to use pragmas 'strict and warnings', cause they are already enabled by Moo.
But I couldn't find any information about utf8 pragma. Do I need to use it explicit?

And there is one more question about use namespace::clean and no warnings qw(experimental::signatures). In Moo docs there is a line: "Moo will not clean up imported subroutines for you; you will have to do that manually. The recommended way to do this is to declare your imports first, then use Moo, then use namespace::clean" . But when I do this warning about signatures occurs. Is there a nicer way to use them together?

Comment on use utf8 pragma with moo

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Re: use utf8 pragma with moo by davido (Cardinal) on Jan 14, 2022 at 18:45 UTC
Within your Moo based module, try this: `package Foo; use Moo; use Data::Dumper; warn Dumper [sort keys %INC]; 1;` [download] On my system with Perl 5.32 I get the following output: `$VAR1 = [ 'Carp.pm', 'Config.pm', 'Data/Dumper.pm', 'Exporter.pm', 'Foo.pm', 'List/Util.pm', 'Moo.pm', 'Moo/Object.pm', 'Moo/_Utils.pm', 'Moo/sification.pm', 'Scalar/Util.pm', 'Sub/Util.pm', 'XSLoader.pm', 'bytes.pm', 'constant.pm', 'mro.pm', 'overloading.pm', 'strict.pm', 'warnings.pm', 'warnings/register.pm' ];` [download] So you can see that the utf8 pragma isn't enabled by default by Moo. Can you provide a self-contained code snippet that demonstrates the namespace::clean issue? Also within the namespace::clean documentation, it does mention that you can pass an `-except => [qw(foo bar)];` list of subs not to clean. Doing so may improve your experience. Dave	[reply] [d/l] [select]
Re^2: use utf8 pragma with moo by AlexP (Pilgrim) on Jan 15, 2022 at 08:46 UTC
Thank you very much for "warn Dumper sort keys %INC" - this is brilliant. The problem with namespace: `use utf8; use feature qw(signatures); no warnings qw(experimental::signatures); use Moo; use namespace::clean; sub BUILD($self) { $self->_set_count(1); }` [download] An error: "The signatures feature is experimental ..." Should I place no warnings after namespace::clean or there are other solutions? Maybe with namespace::clean -except?	[reply] [d/l]
Re^3: use utf8 pragma with moo by Corion (Patriarch) on Jan 15, 2022 at 08:50 UTC
The "problem" with Moo is that it re-enables all warnings that you previously disabled. So a solution is to disable warnings after the `use Moo;` line: `use utf8; use feature qw(signatures); use Moo; no warnings qw(experimental::signatures);` [download]	[reply] [d/l] [select]
Re^4: use utf8 pragma with moo by syphilis (Archbishop) on Jan 15, 2022 at 13:47 UTC
Re^5: use utf8 pragma with moo by Corion (Patriarch) on Jan 16, 2022 at 07:10 UTC
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Re^4: use utf8 pragma with moo by AlexP (Pilgrim) on Jan 15, 2022 at 08:58 UTC
Re: use utf8 pragma with moo by ikegami (Patriarch) on Jan 14, 2022 at 19:07 UTC
If you're source code is encoded using UTF-8, add `use utf8;`. If you're source code is encoded using ASCII, don't use `use utf8;`.	[reply] [d/l] [select]