Mojoliciousのプラグインを作る ref: http://qiita.com/uchiko/items/58f33ae7724b7fd720fb

Example.pm

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

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

}

1;

file0.txt

$ mkdir -p lib/Mojolicious/Plugin

myapp.pl

push @{app->plugins->namespaces}, 'MyApp::Plugin';

Nl2br.pm

package Mojolicious::Plugin::Nl2br;
use Mojo::Base 'Mojolicious::Plugin';

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

    $app->helper('nl2br' => sub {
        my ($c, $text) = @_;
        $text =~ s/(\r\n|\n\r|\n|\r)/<br\/>$1/g;
        return $text;
    });
}

1;