66 lines
1.7 KiB
Perl
66 lines
1.7 KiB
Perl
#! /usr/bin/perl
|
|
|
|
# $OpenBSD: extract-dependencies,v 1.1 2010/08/20 14:44:56 espie Exp $
|
|
#
|
|
# Copyright (c) 2005 Marc Espie <espie@openbsd.org>
|
|
#
|
|
# Permission to use, copy, modify, and distribute this software for any
|
|
# purpose with or without fee is hereby granted, provided that the above
|
|
# copyright notice and this permission notice appear in all copies.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
|
|
# Usage: extract-dependencies < 'tsort-pairs' seed
|
|
# extracts all the dependencies for seed from a list that contains more
|
|
# than that.
|
|
|
|
use strict;
|
|
use warnings;
|
|
|
|
use Getopt::Std;
|
|
my %opts;
|
|
|
|
getopts('r', \%opts);
|
|
|
|
|
|
# build dependency graph
|
|
my $dep = {};
|
|
while (<STDIN>) {
|
|
chomp;
|
|
my ($a, $b) = split(/\s+/, $_);
|
|
if ($opts{r}) {
|
|
($a, $b) = ($b, $a);
|
|
}
|
|
$dep->{$a} = {} unless defined $dep->{$a};
|
|
$dep->{$a}->{$b} = 1;
|
|
}
|
|
|
|
# get the starting points
|
|
my %pkgpath = map {($_, 1)} @ARGV;
|
|
|
|
my @todo = ();
|
|
my $done = {};
|
|
|
|
# walk the graph repeatedly starting from it
|
|
|
|
push(@todo, keys %pkgpath);
|
|
|
|
while (my $x = shift @todo) {
|
|
next if $done->{$x};
|
|
$done->{$x} = 1;
|
|
next unless defined $dep->{$x};
|
|
push(@todo, keys %{$dep->{$x}});
|
|
}
|
|
|
|
# display all nodes, except for the seeds
|
|
for my $d (keys %$done) {
|
|
next if $pkgpath{$d};
|
|
print "$d\n";
|
|
}
|