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$OpenBSD: RequiredBy.pod,v 1.1 2020/12/20 15:30:58 daniel Exp $
=head1 NAME
OpenBSD::RequiredBy - manage installed package dependencies
=head1 SYNOPSIS
use OpenBSD::RequiredBy;
# let's do things for real
our $not = 0;
my $o = OpenBSD::RequiredBy->new($pkgname);
my $o2 = OpenBSD::Requiring->new($pkgname);
print "Requirements for $pkgname are ", join(' ',$o2->list), "\n";
# add some reverse dependencies
$o->add($reverse_dep1, $reverse_dep2);
# remove some dependency
$o2->delete($dep);
# forget some cache entry
OpenBSD::RequiredBy->forget(installed_info($pkgname));
# compute the transitive closure of some dependencies
my @fulldeps = OpenBSD::Requiring->compute_closure($pkg1, $pkg2);
=head1 DESCRIPTION
=for comment should add a reference to L<PackageInfo/installed_info>
when it's documented.
C<OpenBSD::RequiredBy> handles lists of forward and reverse dependencies
for installed packages.
If C<$main::not> is true, all change operations are done internally and
never written to disk.
C<$o = OpenBSD::RequiredBy-E<gt>new($pkgname)> gives access to the reverse
dependencies,
C<$o =OpenBSD::Requiring-E<gt>new($pkgname)> gives access to the forward
dependencies.
Such an object can be used to list the dependencies C<$o-E<gt>list>,
add names to them C<$o-E<gt>add(name1, name2, ...)> or remove name from
them C<$o-E<gt>delete(name1, name2, ...)>.
The full list of forward dependencies (transitive closure) from a set of
packages is given by
C<OpenBSD::RequiredBy-E<gt>compute_closure($name1, name2, ...)>.
Likewise,
C<OpenBSD::Requiring-E<gt>compute_closure($name1, name2, ...)>
yields the list of reverse dependencies.
Those lists of dependencies trim duplicates and, unless C<$main::not> is true,
disk files are automatically synchronized whenever the lists change.
C<OpenBSD::RequiredBy> maintains a cache for efficiency. When an
installed package is deleted completely,
C<OpenBSD::RequiredBy-E<gt>forget($dir)> and
C<OpenBSD::Requiring-E<gt>forget($dir)> will remove the cache entries.
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