gistfile1.pl

package Mojolicious::Plugin::MarkaplRenderer;
use strict;
use warnings;

use Mojo::Base 'Mojolicious::Plugin';

sub register {
    my ($self, $app, $conf) = @_;

    $conf ||= {};
    my $name = $conf->{name} || 'markapl';

    $app->renderer->add_handler(
        $name => sub {
            my ($r, $c, $output, $options) = @_;
            $$output = 'always test';

            return 1;
        }
    );
}

1;