Here you will find what you are looking for http://www.ecartservice.net/prestashop-articles/1-4-plugins-revisited-part-1/
This is a great and easy way to call modules directly in template files without using hooks. I tested it in both Prestashop 1.4 and 1.5, and it works.
For Prestashop 1.5, you will need to create 2 additional files in the "override" folder, as described in the link above:
- Plugin.php in / override / classes /
- FrontController.php in / override / classes / controller /
Then you can use the following code in the template files:
{plugin module='editorial' hook='displayHome'}
You need to use the hook name (displayHome) and NOT an alias (home).
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