package if; $VERSION = '0.05'; sub work { my $method = shift() ? 'import' : 'unimport'; die "Too few arguments to `use if' (some code returning an empty list in list context?)" unless @_ >= 2; return unless shift; # CONDITION my $p = $_[0]; # PACKAGE (my $file = "$p.pm") =~ s!::!/!g; require $file; # Works even if $_[0] is a keyword (like open) my $m = $p->can($method); goto &$m if $m; } sub import { shift; unshift @_, 1; goto &work } sub unimport { shift; unshift @_, 0; goto &work } 1; __END__ =head1 NAME if - C a Perl module if a condition holds =head1 SYNOPSIS use if CONDITION, MODULE => ARGUMENTS; =head1 DESCRIPTION The construct use if CONDITION, MODULE => ARGUMENTS; has no effect unless C is true. In this case the effect is the same as of use MODULE ARGUMENTS; Above C<< => >> provides necessary quoting of C. If not used (e.g., no ARGUMENTS to give), you'd better quote C yourselves. =head1 BUGS The current implementation does not allow specification of the required version of the module. =head1 AUTHOR Ilya Zakharevich L. =cut