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    my $hash = $self->_hash;
    $self->_hash($hash = {}) unless $hash;
    $self->_data($data = []) unless $data;
    push(@$data, $el);
    $hash->{$name || $el->dest_name || ""} = $el;
    $self->_tally(($self->_tally||0)+1);
    $el->seq($self->_tally);
    $self;
}

sub byname {
    my ($self, $file) = @_;
    $self->_hash ? $self->_hash->{$file} : undef;
}

sub entries {
    my ($self) = @_;
    $self->_data([]) unless $self->_data;
    wantarray ? @{$self->_data} : $self->_data;
}

sub tally {
    my ($self) = @_;
    $self->_tally || 0;
}

sub byseq {
    my ($self, $seq) = @_;
    $self->_data ? $self->_data->[$seq-1] : undef;
}

sub filter {
    my ($self, $filter) = @_;
    my $new = FileList->new;
    my $prev;
    foreach my $el ( @{$self->entries} ) {
	next unless $filter->($el);
	my $e = bless { %$el }, 'ImageInfo';	# one level copy
	$e->prev($prev->seq) if $prev;
	$new->add($e);
	$prev->next($e->seq) if $prev;
	$prev = $e;
    }
    return $new;
}

#### Cache maintenance.

package ImageInfoCache;

use constant CACHE_VERSION => 3;

sub new {
    my ($pkg, $file) = @_;
    $pkg = ref($pkg) || $pkg;
    my $self = bless({}, $pkg);
    if ( defined($file) ) {
	$self->load($file);
	if ( ($self->{_version} || 1) != CACHE_VERSION ) {
	    warn("Incompatible cache version " . $self->version .
		 " -- invalidated\n") if $verbose;
	    $self = bless({}, $pkg);
	}
    }
    $self->{_version} = CACHE_VERSION;
    $self;
}

sub load {
    my ($self, $file) = @_;
    our $info;
    $info = undef;
    eval {
	use lib '.';
	require $file;
    };
    if ( $@ ) {
	warn("Illegal cache -- invalidated\n") if $verbose;
	return;
    }
    @{$self}{keys(%$info)} = values(%$info);
}

sub store {
    my ($self, $file) = @_;
    $Data::Dumper::Indent = 1;
    $Data::Dumper::Sortkeys = 1;
    $Data::Dumper::Sortkeys = 1; # avoid warnings
    $Data::Dumper::Purity = 1;
    my $cache = do { local *C; *C };
    open($cache, ">", $file)
      and print $cache (Data::Dumper->Dump([$self],[qw(info)]), "\n1;\n")
	and close($cache);
}

sub entry {
    my ($self, $file, $entry) = @_;
    $file =~ s;^\./;;;
    if ( defined $entry ) {
	$self->{$file} = $entry;
    }
    else {
	$entry = $self->{$file};
    }
    $entry;
}

sub entries {
    my ($self) = @_;
    [ sort(keys(%{$self})) ];
}

sub version {
    my ($self) = @_;
    $self->{_version};
}

package main;

=head1 NAME

Album - create and maintain HTML based photo albums

=head1 SYNOPSIS

A photo album consists of a number of (large) pictures, small thumbnail
images, and index pages. Optionally, medium sized images can be
generated as well. The album will be organised as follows:

  index/	   index pages with thumbnails
  icons/           directory with navigation icons
  large/           original (large) images, with HTML pages
  medium/          optional medium sized images, with HTML pages

Each image can be labeled with a description, a tag (applies to a
group of images, e.g. a date), the image name, and some
characteristics (size and dimensions).