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use v5.36, this one is somewhat trivial

#! /usr/bin/perl
# Copyright (c) 2005-2010 Marc Espie <espie@openbsd.org>
# $OpenBSD: pkg_mklocatedb,v 1.48 2023/05/29 07:35:39 espie Exp $
#
# 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.

use v5.36;
no lib ('/usr/local/libdata/perl5/site_perl');

use OpenBSD::PackageInfo;
use OpenBSD::PackingList;
use OpenBSD::Getopt;
use OpenBSD::Error;
use OpenBSD::Paths;
use OpenBSD::AddCreateDelete;

package OpenBSD::Pkgmklocatedb::State;
our @ISA = qw(OpenBSD::AddCreateDelete::State);

sub handle_options($state)
{
	$state->{no_exports} = 1;
	$state->SUPER::handle_options('ad:Knqp:Pu', 
	    '[-aKnPqu] [-d repository] [-p portsdir] [pkg-name ...]');
	$state->{portsdir} = $state->opt('p');
	$state->{pkgdir} = $state->opt('d');
	$state->{quiet} = $state->opt('q');
	$state->{pkgpath} = $state->opt('P');
	$state->{allinfo} = $state->opt('a');
	$state->{nopipe} = $state->opt('n');
	$state->{full} = $state->opt('K');
	$state->{update} = $state->opt('u');
}

package OpenBSD::PackingElement;
sub print_name($, $) {}
sub set_header($, $) {}

package OpenBSD::PackingElement::Name;
sub set_header($self, $state)
{
	$state->{currentheader} = $self->{name}.':';
}

package OpenBSD::PackingElement::ExtraInfo;
sub set_header($self, $state)
{
	if ($state->{allinfo}) {
		$state->{currentheader} .=  $self->{subdir}.':';
	} elsif ($state->{pkgpath}) {
		$state->{currentheader} = $self->{subdir}.':';
	}
	$state->{done}{$self->{subdir}} = 1;
	$state->errsay($state->{currentheader}) unless $state->{quiet};
}

package OpenBSD::PackingElement::FileObject;
sub object_name($self, $state)
{
	if ($state->{full}) {
		if ($self->needs_keyword) {
			return "\@".$self->keyword." ".$self->fullname;
		}
	}
	return $self->fullname;
}

sub print_name($self, $state)
{
	print {$state->{out}} $state->{currentheader}, 
	    $self->object_name($state), "\n";
}

package OpenBSD::PackingElement::Action;
sub print_name($self, $state)
{
	print {$state->{out}} $state->{currentheader}, $self->fullstring, "\n";
}

package OpenBSD::PackingElement::ExeclikeAction;
sub print_name($self, $state)
{
	print {$state->{out}} $state->{currentheader}, "\@". 
	    $self->keyword, " ", $self->{expanded}, "\n";
}

package OpenBSD::PackingElement::Conflict;
sub print_name
{
	&OpenBSD::PackingElement::Action::print_name;
}

package OpenBSD::PackingElement::NoDefaultConflict;
sub print_name
{
	&OpenBSD::PackingElement::Action::print_name;
}

package OpenBSD::PackingElement::TagBase;
sub print_name($self, $state)
{
	print {$state->{out}} $state->{currentheader}, "\@". 
	    join(' ', $self->keyword, $self->name, $self->{params}), "\n";
}

package OpenBSD::PackingElement::Tag;
sub print_name($self, $state)
{
	print {$state->{out}} $state->{currentheader}, "\@". 
	    join(' ', $self->keyword, $self->name, $self->{expanded}), "\n";
}

package OpenBSD::PackingElement::DirBase;
sub print_name($self, $state)
{
	print {$state->{out}} $state->{currentheader}, 
	    $self->object_name($state), "/\n";
}

package main;

sub open_output($state)
{
	if ($state->{nopipe} or -t STDOUT) {
		$state->{out} = \*STDOUT;
	} else {
		my $MKLOCATEDB = OpenBSD::Paths->mklocatedb;

		open $state->{out}, "|-", $MKLOCATEDB, $MKLOCATEDB or 
		    $state->fatal("couldn't open pipe to mklocatedb: #1", $!);
	}
}

sub print_out($plist, $state)
{
	$plist->set_header($state);
	$plist->print_name($state);
}

sub do_portsdir($state)
{
	my $make = $ENV{MAKE} || 'make';
	my $target = defined $ENV{SUBDIRLIST} ? 
	    'print-plist' : 'print-plist-all';
	delete $ENV{FLAVOR};
	delete $ENV{SUBPACKAGE};
	open my $in, "cd $state->{portsdir} && $make $target |";
	my $done = 0;
	while (!$done) {
		my $plist = OpenBSD::PackingList->read($in,
		    sub {
			my ($fh, $cont) = @_;
			while (<$fh>) {
				return if m/^\=\=\=\> /o;
				&$cont($_);
			}
			$done = 1;
		    });
		if (defined $plist && defined $plist->pkgname) {
			print_out($plist, $state);
		}
	}
	close($in);
}

sub do_pkgdir($state)
{
	require File::Find;
	no warnings qw(once);
	$state->fatal("Bad argument: #1 is not a directory", $state->{pkgdir})
	    unless -d $state->{pkgdir};
	File::Find::find(
	    sub() {
		return unless -f $_;
		my $plist = $state->repo->grabPlist($File::Find::name);
		return unless defined $plist;
		print_out($plist, $state);
	    }, $state->{pkgdir});
}

sub copy_stdin($state)
{
	while (<STDIN>) {
		# if we find something that looks like a pkgpath we've done
		# assume we were updating it
		if (m,([^:]*/[^:]*)\:,) {
			next if defined $state->{done}{$1};
		}
		print {$state->{out}} $_;
	}
}

my $state = OpenBSD::Pkgmklocatedb::State->new;
$state->handle_options;

open_output($state);

if ($state->{fatals}) {
	$state->fatal("Files not found, can't continue");
}

if ($state->{portsdir}) {
	do_portsdir($state);
} elsif ($state->{pkgdir}) {
	do_pkgdir($state);
} elsif (@ARGV == 0) {
	if (!$state->{update}) {
		$state->progress->for_list("Scanning installation",
		    [installed_packages()], sub {
			my $pkgname = shift;
			my $plist = 
			    OpenBSD::PackingList->from_installation($pkgname);
			return unless defined $plist;
			print_out($plist, $state);
		    });
	}
} else {
	$state->progress->for_list("Scanning packages", \@ARGV,
	    sub {
	    	my $pkgname = shift;
		my $plist = $state->repo->grabPlist($pkgname);
		next unless $plist;
		print_out($plist, $state);
	    });
}
if ($state->{update}) {
	copy_stdin($state);
}