This plugin allows execution of complex code directly from themes by providing a service provider and composer support. Through the new service provider, anything that can be done with a plugin can now be done with a theme.

It basically makes OctoberCMS load your theme as a plugin in the system. So create the plugin definition file as you would normally but make sure to extend \NSRosenqvist\ThemesPlus\Classes\ThemesPlusBase instead of the normal PluginBase.

Either install it via the marketplace or simply clone this repository into your OctoberCMS installations' plugins directory.

cd <your-october-root>/plugins
git clone https://github.com/nsrosenqvist/october-plugin_themesplus.git nsrosenqvist/themesplus

Then run:

php artisan plugin:refresh NSRosenqvist.ThemesPlus`

Make sure to specify NSRosenqvist.ThemesPlus as a theme dependency and then add a Plugin.php file in the theme root with the following code:

<?php namespace MyCompany\MyTheme;

class Plugin extends \NSRosenqvist\ThemesPlus\Classes\ThemesPlusBase
{
    public function pluginDetails()
    {
        return [
            'name' => 'Themes+Theme',
            'description' => 'Execute complex tasks from your theme.',
            'author' => 'Your Name',
            'icon' => 'icon-leaf',
            'homepage' => 'https://www.example.com/'
        ];
    }

    // And all functions for things you want to register...
}