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File less.pm

package less;
use strict;
use warnings;

our $VERSION = '0.03';

sub _pack_tags {
    return join ' ', @_;
}

sub _unpack_tags {
    return grep { defined and length }
        map  { split ' ' }
        grep {defined} @_;
}

sub stash_name { $_[0] }

sub of {
    my $class = shift @_;

# If no one wants the result, don't bother computing it.
    return unless defined wantarray;

my $hinthash = ( caller 0 )[10];
    my %tags;
    @tags{ _unpack_tags( $hinthash->{ $class->stash_name } ) } = ();

if (@_) {
        exists $tags{$_} and return !!1 for @_;
        return;
    }
    else {
        return keys %tags;
    }
}

sub import {
    my $class = shift @_;
    my $stash = $class->stash_name;

@_ = 'please' if not @_;
    my %tags;
    @tags{ _unpack_tags( @_, $^H{ $stash } ) } = ();

$^H{$stash} = _pack_tags( keys %tags );
    return;
}

sub unimport {
    my $class = shift @_;

if (@_) {
        my %tags;
        @tags{ _unpack_tags( $^H{$class} ) } = ();
        delete @tags{ _unpack_tags(@_) };
        my $new = _pack_tags( keys %tags );

if ( not length $new ) {
            delete $^H{ $class->stash_name };
        }
        else {
            $^H{ $class->stash_name } = $new;
        }
    }
    else {
        delete $^H{ $class->stash_name };
    }

return;
}

__END__

=head1 NAME

less - perl pragma to request less of something

=head1 SYNOPSIS

use less 'CPU';

=head1 DESCRIPTION

This is a user-pragma. If you're very lucky some code you're using
will know that you asked for less CPU usage or ram or fat or... we
just can't know. Consult your documentation on everything you're
currently using.

For general suggestions, try requesting C<CPU> or C<memory>.

use less 'memory';
    use less 'CPU';
    use less 'fat';

If you ask for nothing in particular, you'll be asking for C<less
'please'>.

use less 'please';

=head1 FOR MODULE AUTHORS

L<less> has been in the core as a "joke" module for ages now and it
hasn't had any real way to communicating any information to
anything. Thanks to Nicholas Clark we have user pragmas (see
L<perlpragma>) and now C<less> can do something.

You can probably expect your users to be able to guess that they can
request less CPU or memory or just "less" overall.

If the user didn't specify anything, it's interpreted as having used
the C<please> tag. It's up to you to make this useful.

# equivalent
  use less;
  use less 'please';

=head2 C<< BOOLEAN = less->of( FEATURE ) >>

The class method C<< less->of( NAME ) >> returns a boolean to tell you
whether your user requested less of something.

if ( less->of( 'CPU' ) ) {
      ...
  }
  elsif ( less->of( 'memory' ) ) {

}

=head2 C<< FEATURES = less->of() >>

If you don't ask for any feature, you get the list of features that
the user requested you to be nice to. This has the nice side effect
that if you don't respect anything in particular then you can just ask
for it and use it like a boolean.

if ( less->of ) {
      ...
  }
  else {
      ...
  }

=head1 CAVEATS

=over

=item This probably does nothing.

=item This works only on 5.10+

At least it's backwards compatible in not doing much.

=back

=cut

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
..	DIR	-	drwxr-xr-x	2025-10-16 10:59:21
Attribute	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
B	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
CPAN	DIR	-	drwxr-xr-x	2024-03-13 04:56:46
Class	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Compress	DIR	-	drwxr-xr-x	2024-03-13 04:36:57
Config	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
DBM_Filter	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Devel	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
ExtUtils	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
File	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Getopt	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
I18N	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
IO	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
IPC	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Locale	DIR	-	drwxr-xr-x	2025-07-28 08:08:32
Math	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Memoize	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Module	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Net	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Pod	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Search	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Term	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Text	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Thread	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Tie	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Time	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
URI	DIR	-	drwxr-xr-x	2024-03-13 04:36:40
Unicode	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
User	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
encoding	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
overload	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
pod	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
unicore	DIR	-	drwxr-xr-x	2025-07-29 10:57:24
vendor_perl	DIR	-	drwxr-xr-x	2025-07-28 08:07:18
warnings	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
AnyDBM_File.pm	text/plain	2.56 KB	-rw-r--r--	2025-07-28 08:07:09
AutoLoader.pm	text/plain	15.43 KB	-rw-r--r--	2025-07-28 08:07:09
AutoSplit.pm	text/plain	19.18 KB	-rw-r--r--	2025-07-28 08:07:09
Benchmark.pm	text/plain	30.3 KB	-rw-r--r--	2025-07-28 08:07:09
CORE.pod	text/plain	3.11 KB	-rw-r--r--	2025-07-28 08:07:09
DB.pm	text/plain	18.48 KB	-rw-r--r--	2025-07-28 08:07:09
DBM_Filter.pm	text/plain	14.05 KB	-rw-r--r--	2025-07-28 08:07:09
DirHandle.pm	text/plain	1.52 KB	-rw-r--r--	2025-07-28 08:07:09
Dumpvalue.pm	text/plain	17.14 KB	-rw-r--r--	2025-07-28 08:07:09
English.pm	text/plain	4.65 KB	-rw-r--r--	2025-07-28 08:07:09
FileCache.pm	text/plain	5.44 KB	-rw-r--r--	2025-07-28 08:07:09
FileHandle.pm	text/plain	6.63 KB	-rw-r--r--	2025-07-28 08:07:09
FindBin.pm	text/plain	4.45 KB	-rw-r--r--	2025-07-28 08:07:09
Internals.pod	text/plain	2.52 KB	-rw-r--r--	2025-07-28 08:07:09
Memoize.pm	text/plain	35.34 KB	-rw-r--r--	2025-07-28 08:08:32
NEXT.pm	text/plain	18.4 KB	-rw-r--r--	2025-07-28 08:07:09
PerlIO.pm	text/plain	10.21 KB	-rw-r--r--	2025-07-28 08:07:09
Safe.pm	text/plain	24.49 KB	-rw-r--r--	2025-07-28 08:07:09
SelectSaver.pm	text/plain	1.05 KB	-rw-r--r--	2025-07-28 08:07:09
SelfLoader.pm	text/plain	17.28 KB	-rw-r--r--	2025-07-28 08:08:32
Symbol.pm	text/plain	4.69 KB	-rw-r--r--	2025-07-28 08:07:09
Test.pm	text/plain	29.35 KB	-rw-r--r--	2025-07-28 08:08:32
Thread.pm	text/plain	8.09 KB	-rw-r--r--	2025-07-28 08:07:09
UNIVERSAL.pm	text/plain	6.44 KB	-rw-r--r--	2025-07-28 08:07:09
URI.pm	text/plain	33.97 KB	-rw-r--r--	2018-01-09 06:42:55
XSLoader.pm	text/plain	11 KB	-rw-r--r--	2025-07-28 08:07:09
_charnames.pm	text/plain	32.39 KB	-rw-r--r--	2025-07-28 08:07:09
autouse.pm	text/plain	4.14 KB	-rw-r--r--	2025-07-28 08:07:09
base.pm	text/plain	10.72 KB	-rw-r--r--	2025-07-28 08:07:09
blib.pm	text/plain	2.04 KB	-rw-r--r--	2025-07-28 08:07:09
bytes.pm	text/plain	3.67 KB	-rw-r--r--	2025-07-28 08:07:09
bytes_heavy.pl	text/plain	758 B	-rw-r--r--	2025-07-28 08:07:09
charnames.pm	text/plain	20.38 KB	-rw-r--r--	2025-07-28 08:07:09
deprecate.pm	text/plain	3.01 KB	-rw-r--r--	2025-07-28 08:07:09
diagnostics.pm	text/plain	18.59 KB	-rw-r--r--	2025-07-28 08:07:09
dumpvar.pl	text/plain	15.19 KB	-rw-r--r--	2025-07-28 08:07:09
feature.pm	text/plain	16.68 KB	-rw-r--r--	2025-07-28 08:07:09
fields.pm	text/plain	9.27 KB	-rw-r--r--	2025-07-28 08:07:09
filetest.pm	text/plain	3.91 KB	-rw-r--r--	2025-07-28 08:07:09
if.pm	text/plain	3.26 KB	-rw-r--r--	2025-07-28 08:07:09
integer.pm	text/plain	3.18 KB	-rw-r--r--	2025-07-28 08:07:09
less.pm	text/plain	3.13 KB	-rw-r--r--	2025-07-28 08:07:09
locale.pm	text/plain	4.74 KB	-rw-r--r--	2025-07-28 08:07:09
meta_notation.pm	text/plain	2.07 KB	-rw-r--r--	2025-07-28 08:07:09
open.pm	text/plain	7.83 KB	-rw-r--r--	2025-07-28 08:08:32
overload.pm	text/plain	52.06 KB	-rw-r--r--	2025-07-28 08:07:09
overloading.pm	text/plain	1.77 KB	-rw-r--r--	2025-07-28 08:07:09
perl5db.pl	text/plain	309 KB	-rw-r--r--	2025-07-28 08:07:09
sigtrap.pm	text/plain	7.43 KB	-rw-r--r--	2025-07-28 08:07:09
sort.pm	text/plain	5.94 KB	-rw-r--r--	2025-07-28 08:07:09
strict.pm	text/plain	4.63 KB	-rw-r--r--	2025-07-28 08:07:09
subs.pm	text/plain	848 B	-rw-r--r--	2025-07-28 08:07:09
utf8.pm	text/plain	8.9 KB	-rw-r--r--	2025-07-28 08:07:09
utf8_heavy.pl	text/plain	30.87 KB	-rw-r--r--	2025-07-28 08:07:09
vars.pm	text/plain	2.36 KB	-rw-r--r--	2025-07-28 08:07:09
vmsish.pm	text/plain	4.21 KB	-rw-r--r--	2025-07-28 08:07:09
warnings.pm	text/plain	43.71 KB	-rw-r--r--	2025-07-28 08:07:09

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