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Smart Package Manager zjednodušuje instalaci

Tak som vyhrabal nejaku starsiu verziu toho skriptu. Treba mat nainstalovany gentoolkit. Vola to 'equery depends' a vyrobi graf reverznych zavislosti v style

balik: zavislost1, zavislost2, zavislost3

Potom staci vygrepovat baliky, na ktorych nie su ziadne zavislosti, pozret ze co vlastne z toho chceme mat nainstalovane a povyhadzovat kniznice, ktore zostali. Inak ten skript je sialene pomaly (pretoze vola equery tolkokrat kolko je balikov, lepsie by to bolo cez portage api hladat dopredne zavislosti a urobit graf z nich, ale ked api je len v pythone a swig tiez moc nemusim...)

#!/usr/bin/perl -w
#For each installed package, lists packages directly depending on the package
#Basically writes out reverse dependency graph in the form 
#package: dependency1, dependency2, ... dependencyN
#e.g.:
#app-cdr/cdrkit: app-cdr/cdrdao, app-cdr/dvd+rw-tools, app-cdr/k3b
#
#This script is horribly slow, because it calls equery depends for each package.
#Also it'd break if equery output/options changed.

use strict;

my (%pkgs, $verbose);

$verbose = 1;

#read and parse all installed packages
open(EQUERY, "equery -d -C list -i |");
while (<EQUERY>)
{
    chomp;
    
    #strip brackets
    #s/^\[.*?\]\s+\[.*?\]\s+(.*)\s+\(.*\)$/$1/;
    if (/^\s+/) {next;} #skip " * installed packages" note
    #leave only package name without version
    my $pkgname = stripversion($_); 
    
    #create ref to array
    $pkgs{$pkgname} = [];
}
close(EQUERY);

$, = ", ";
$" = ", ";

foreach my $pkgname (sort keys %pkgs)
{
    local(*EQUERY);
    my ($dep);
    open(EQUERY, "equery -q d $pkgname|");

    #read each dependency
    while ($dep = <EQUERY>)
    {
	chomp($dep);
	my $dep = stripversion($dep);
	push (@{$pkgs{$pkgname}}, $dep);
    }
    close(EQUERY);
    
    print "$pkgname: ";
    print @{$pkgs{$pkgname}};
    print "\n";
}

sub stripversion
{
    my $pkgname = shift;
    
    $pkgname =~ s/-\d.*$//;
    
    return $pkgname;
}