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# -*- perl -*-
use strict;
use warnings;
use Data::Dumper;
use Pod::Usage;
use Pod::Man;
use Getopt::Long qw(:config gnu_getopt no_ignore_case);
use File::Basename;
use Unix::Sysexits;
use SlackBuilder;
use SlackBuild::Request;
use JSON;

use constant {
    EX_FAIL => 1
};

my $progname = basename($0);
my $progdescr = "Slackware package builder";

sub abend {
    my $code = shift;
    print STDERR "$progname: " if defined($progname);
    print STDERR "@_\n";
    exit $code;
}

sub error {
    my $msg = shift;
    local %_ = @_;
    print STDERR "$progname: " if defined($progname);
    print STDERR "$_{prefix}: " if defined($_{prefix});
            print STDERR "$msg\n"
}

sub readfile {
    my $file = shift;
    local $/ = undef;
    open(my $fd, $file) or abend(EX_NOINPUT, "can't open file $file: $!");
    my $string = <$fd>;
    close $fd;
    return decode_json($string);
}

my %sbargs;
GetOptions("h" => sub {
               pod2usage(-message => "$progname: $progdescr",
			 -exitstatus => EX_OK);
	   },
	   "help" => sub {
	       pod2usage(-exitstatus => EX_OK, -verbose => 2);
	   },
	   "usage" => sub {
	       pod2usage(-exitstatus => EX_OK, -verbose => 0);
	   },
	   "verbose|v+" => \$sbargs{verbose},
	   "image|i=s" => \$sbargs{image},
	   "rootdir|C=s" => \$sbargs{image}
    ) or exit(EX_USAGE);

abend(EX_USAGE, "bad number of arguments") unless @ARGV == 1;
my $reqname = shift @ARGV;
my $req;

unless (-f $reqname) {
    if ($reqname =~ m{(?:http|ftp)s?://.*/
                      (.+?) \.tar(?:\.(?:[xgl]z|bz2))?}x) {
	$req = { package => $1, slackbuild_uri => $reqname };
    } else {
	abend(EX_NOINPUT, "request file $reqname does not exist");
    }
} else {
    $req = readfile($reqname);
}

my $builder = new SlackBuilder(%sbargs);
$builder->run(new SlackBuild::Request($req));
if ($builder->is_success) {
    if ($builder->output_files == 0) {
	print STDERR "Build exited successfully, but no output files were generated\n";
	exit EX_FAIL;
    }
    print "OK. File list:\n";
    foreach my $f ($builder->output_files) {
	print "$f\n";
    }
} else {
    print STDERR "ERROR: " . $builder->errno . "\n";
    foreach my $e ($builder->errors) {
	print STDERR "$e\n";
    }
}

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