package plugin;

my @callbacks;

sub register {
        push @callbacks, shift;
}

sub load {
        my $plugindir = shift;

        @callbacks = ();

        opendir PLUGIN, $plugindir or die "Cannot open dir $plugindir: $!\n";

        @plugins = grep { /\.pl$/ } readdir(PLUGIN);

        closedir PLUGIN;

        foreach $plugin (@plugins) {
                print "Loading $plugindir/$plugin...\n";
                require "$plugindir/$plugin";
        }

        return @callbacks;
}

1;

package example;

sub new {
        return bless {};
}

sub hello {
    my $self = shift;

    print "hello!\n";
}

plugin::register(example->new);

package main;
use plugin;

@plugins = plugin::load("a_directory");

foreach $plugin (@plugins) {
   $plugin->hello();
}