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//usr/bin/cpansign

#!/usr/bin/perl

$VERSION = '0.06';

=encoding utf8

=head1 NAME

cpansign - CPAN signature management utility

=head1 SYNOPSIS

% cpansign		    # verify an existing SIGNATURE, or
			    # make a new one if none exists

% cpansign file.par	    # verify or sign a PAR file

% cpansign sign	    # make signature; overwrites existing one
    % cpansign -s	    # same thing

% cpansign verify	    # verify a signature
    % cpansign -v	    # same thing
    % cpansign -v --skip    # ignore files in MANIFEST.SKIP

% cpansign help	    # display this documentation
    % cpansign -h	    # same thing

=head1 DESCRIPTION

This utility lets you create and verify SIGNATURE files.

=cut

use strict;
use Module::Signature;

$Module::Signature::Verbose = 1;

my %cmd = (
    s => 'sign',
    v => 'verify',
    h => 'help',
);

my $op = $ARGV[0]; $op =~ s/^--?// if defined $op;
my $dwim;
if (!$op or $op eq 'skip' or -e $op) {
    $op = (-e 'SIGNATURE' ? 'verify' : 'sign');
    $dwim = 1;
}

my $cmd = $cmd{substr($op, 0, 1)};
(system("perldoc $0"), exit) if $cmd eq 'help';
my @args;
push @args, (overwrite => '1')	if $cmd eq 'sign';
push @args, (skip => '1')	if grep /^-?-?skip/, @ARGV;

if (my $sub = Module::Signature->can($cmd)) {
    if (@ARGV and -e $ARGV[-1]) {
	require PAR::Dist;
	PAR::Dist::_verify_or_sign(
	    dist => $ARGV[-1],
	    $dwim ? () : (action => $cmd, @args)
	);
    }
    else {
	#if ($cmd eq 'sign') {
	#    exit unless Module::Signature::verify();
	#}
	exit($sub->(@args));
    }
}
else {
    die "Unknown command: '$op'.\n".
	"Available actions: " . (join(', ', sort values %cmd)) .  ".\n";
}

exit;

=head1 SEE ALSO

L<Module::Signature>

=head1 AUTHORS

Audrey Tang E<lt>autrijus@autrijus.orgE<gt>

=head1 LICENSE

This work is under the B<CC0 1.0 Universal> license.

To the extent possible under law, 唐鳳 has waived all copyright and related
or neighboring rights to Module-Signature.

This work is published from Taiwan.

L<http://creativecommons.org/publicdomain/zero/1.0>

=cut