#!/usr/bin/perl -w
=head1 NAME

dq-deque - run a command on one task from an IPC::DirQueue queue

=head1 SYNOPSIS

B<dq-deque> --dir I<qdirectory> I<command arg arg ...>

=head1 DESCRIPTION

B<dq-deque> will remove one task from an C<IPC::DirQueue> directory,
run the named command, and then exit.

The command is run as:

    command arg arg ... nameofdatafile

=head1 SEE ALSO

IPC::DirQueue(3)
dq-deque(1)
dq-list(1)
dq-server(1)
dq-submit(1)

=cut

use strict;
use lib 'lib';
use IPC::DirQueue;
use Getopt::Long;

sub usage {
  die "usage: dq-deque --dir qdirectory command arg arg...\n";
}

our $dir;

GetOptions(
  'dir=s'   => \$dir
) or usage();
$dir or usage();

my $dq = IPC::DirQueue->new({ dir => $dir });

my $job = $dq->pickup_queued_job();
if (!$job) {
  print "no jobs left\n";
  exit;
}

system (@ARGV, $job->get_data_path());

$job->finish();
print "finished\n";