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#!/usr/bin/env perl
## Copyright © 2008-2009 by Daniel Friesel <derf@derf.homelinux.org>
## License: WTFPL <http://sam.zoy.org/wtfpl>
use strict;
use warnings;
use 5.010;
use AptPkg::Cache;
use Switch;
use Getopt::Long;
my $cache = AptPkg::Cache->new;
my $max_depth = 5;
my @deptypes;
GetOptions(
'deptype=s' => \@deptypes,
'depth=i' => \$max_depth,
);
my $packagename = shift or die("No packagename given");
my @known;
@deptypes = split(/,/, join(',', @deptypes));
sub revdeps {
my $name = shift;
my $package = $cache->{$name};
my @return;
my $rdeps = $package->{RevDependsList};
foreach (@$rdeps) {
if (
$cache->{$_->{ParentPkg}{Name}}->{CurrentState} eq 'Installed' and (
(not @deptypes and $_->{DepType} !~ /^(Conflicts|Replaces|Obsoletes)$/) or
(@deptypes and "$_->{DepType}" ~~ @deptypes)
)
) {
next if ($_->{ParentPkg}{Name} ~~ @known);
push(@return, $_->{ParentPkg}{Name});
}
}
push(@known, @return);
return(@return);
}
sub recurse {
my $name = shift;
my $depth = (shift) + 1;
printf("%s%s\n", " " x ($depth-1), $name);
return if ($depth >= $max_depth);
recurse($_, $depth) foreach revdeps($name);
}
recurse($packagename, 0);
__END__
=head1 NAME
apt-why - filtered reverse dependency displayer using AptPkg::Cache
=head1 SYNOPSIS
B<apt-why> [ I<options> ] I<package>
=head1 DESCRIPTION
B<apt-why> recursively displays I<package>'s reverse dependency, thus
showing which packages require I<package> on the system.
=head1 OPTIONS
=over
=item B<--depth>=I<integer> (default: 5)
Specify the maximum recursion depth
=item B<--deptype>=I<types>
Only show reverse dependency which mach the specified I<types> (comma separated list).
Right now, possible types are Depends, Suggests, Recommends.
=head1 AUTHOR
Daniel Friesel <derf@derf.homelinux.org>
=head1 LICENSE
0. You just DO WHAT THE FUCK YOU WANT TO.
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