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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 AptPkg::Cache;
use Switch;
use Getopt::Long;
my $cache = AptPkg::Cache->new;
my $not = 0;
my @deptypes;
GetOptions(
'not' => \$not,
'deptype=s' => \@deptypes,
);
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 $level = (shift) + 1;
printf("%s%s\n", " " x ($level-1), $name);
return if ($level >= 5);
recurse($_, $level) foreach revdeps($name);
}
recurse($packagename, 0);
__END__
=head1 NAME
apt-why - filtered reverse dependency displayer using AptPkg::Cache
=head1 SYNOPSIS
B<apt-why> [ B<--not> ] I<package>
=head1 DESCRIPTION
B<apt-why> displays various informations based on a I<package>s reverse
dependencies
The output is prefixed by two charactes, the former representing the desired
package state, the latter the current state.
The states are I<i>nstall, I<h>old, I<r>emove (deinstall), I<p>urge,
I<u>npacked, halI<f> configured, I<h>alf installed, I<c>onfigfiles installed.
An empty field means not installed.
If B<--not> is specified, reverse dependencies prohibiting the installation of
I<package> are shown. Else, reverse dependencies justifying the installation
of I<package> are shown
=head1 AUTHOR
Daniel Friesel <derf@derf.homelinux.org>
=head1 LICENSE
0. You just DO WHAT THE FUCK YOU WANT TO.
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