=head1 DESCRIPTION

# Array::Columnize options processing

=cut
package Array::Columnize;

use vars qw($DEFAULT_OPTS);

# Default values for columize options.
$DEFAULT_OPTS = {
    arrange_array => 0,
    arrange_vertical => 1,
    array_prefix => '',
    array_suffix => '',
    colsep => '  ',
    displaywidth => $ENV{'COLUMNS'} || 80,
    lineprefix => '',
    ljust => 'auto',
    term_adjust => 0
};

# Merge in default configuration options into the passed hash reference.
# Values already set in the hash are untouched.
sub merge_config(%) {
    my $config = shift;
    while (($field, $default_value) = each %$DEFAULT_OPTS) {
	$config->{$field} = $default_value unless defined $config->{$field};
    };
}

if (__FILE__ eq $0 ) {
    my %config;
    merge_config \%config;
    require Data::Dumper;
    print Data::Dumper::Dumper(\%config), "\n";

    my $config = {
	arrange_array => 0,
	term_adjust   => 1,
	lineprefix    => '...',
	displaywidth  => 10,
	bogus         => 'yep'
    };
    print Data::Dumper::Dumper($config), "\n";
    merge_config $config;
    print Data::Dumper::Dumper($config), "\n";
}

1;