| 1 | package if; |
| 2 | |
| 3 | our $VERSION = '0.03'; |
| 4 | |
| 5 | sub work { |
| 6 | my $method = shift() ? 'import' : 'unimport'; |
| 7 | return unless shift; # CONDITION |
| 8 | |
| 9 | my $p = $_[0]; # PACKAGE |
| 10 | (my $file = "$p.pm") =~ s!::!/!g; |
| 11 | require $file or die; |
| 12 | |
| 13 | my $m = $p->can($method); |
| 14 | goto &$m if $m; |
| 15 | } |
| 16 | |
| 17 | sub import { shift; unshift @_, 1; goto &work } |
| 18 | sub unimport { shift; unshift @_, 0; goto &work } |
| 19 | |
| 20 | 1; |
| 21 | __END__ |
| 22 | |
| 23 | =head1 NAME |
| 24 | |
| 25 | if - C<use> a Perl module if a condition holds |
| 26 | |
| 27 | =head1 SYNOPSIS |
| 28 | |
| 29 | use if CONDITION, MODULE => ARGUMENTS; |
| 30 | |
| 31 | =head1 DESCRIPTION |
| 32 | |
| 33 | The construct |
| 34 | |
| 35 | use if CONDITION, MODULE => ARGUMENTS; |
| 36 | |
| 37 | has no effect unless C<CONDITION> is true. In this case the effect is |
| 38 | the same as of |
| 39 | |
| 40 | use MODULE ARGUMENTS; |
| 41 | |
| 42 | =head1 BUGS |
| 43 | |
| 44 | The current implementation does not allow specification of the |
| 45 | required version of the module. |
| 46 | |
| 47 | =head1 AUTHOR |
| 48 | |
| 49 | Ilya Zakharevich L<mailto:perl-module-if@ilyaz.org>. |
| 50 | |
| 51 | =cut |
| 52 | |