#!perl

HELP "market" => "Edit market list";

my $filename = 'revbank.market';

sub command :Tab(market) {
    my ($self, $cart, $command) = @_;

    if ($command eq 'market') {
        system $ENV{EDITOR} || 'vi', $filename;
        return ACCEPT;
    }

    my @products;

    open my $fh, '<', $filename or die $!;
    /\S/ && !/^\s*#/ and push @products, [split " ", $_, 5] while readline $fh;
    chomp @$_ for @products;

    for my $fields (@products) {
        my ($username, $id, $seller, $space, $description) = @$fields;

        next if $command ne $id;
        next if $space  < 0;
        next if $seller < 0;

        $cart->add(undef, -($seller + $space), $description);
        $cart->add($username, 0+$seller, "\$you bought $description")
            if 0+$seller;
        return ACCEPT;
    }

    return NEXT;
}