/usr/share/perl/5.20.2/less.pm is in perl-modules 5.20.2-3+deb8u11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | 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;
}
1;
__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
|