How to create a custom Latte filter ?

[protro]

Hi,

I am using @bernhard Rockfrontend with the Latte engine and wanted to create a custom latte filter called firstParagraph that grabs the first <p> from a field called body.

in _init.php I added the following:

// Include the Latte template engine library
require_once '../modules/RockFrontend/vendor/latte/latte/src/Latte/Engine.php';

// Create a new instance of the Latte engine
$latte = new \Latte\Engine;

// first paragraph summary filter
$latte->addFilter('firstParagraph', function ($s) {
    if (preg_match('/<p.*?>(.*?)<\/p>/', $s, $matches)) {
        return $matches[1];
    }
    return '';
});

But I get a Fatal Error

Trait "Latte\Strict" not found (line 18 of site/modules/RockFrontend/vendor/latte/latte/src/Latte/Engine.php)

Am I going about this the wrong way? Any help/feedback appreciated.

[BitPoet]

Since Latte is a composer package, I'd assume you should require_once '../modules/RockFrontend/vendor/autoload.php' to make sure all dependencies of Latte\Engine are included as well.

[bernhard]

Hey @protro I've refactored RockFrontend so now you can use this:

$latte = $rockfrontend->loadLatte();

It's in the latest DEV commit: https://github.com/baumrock/RockFrontend/commit/b0d1ac6b24bdf5085272d4c324db1b1f0e58fcd6

Does that work for you?

[gornycreative]

Nice I'm guessing this is how we could use the addFunction method also?

[bernhard]

Yeah, just check the docs here https://latte.nette.org/en/extending-latte#toc-functions and then instead of this

$latte = new Latte\Engine;

use this

$latte = $rockfrontend->loadLatte();

Let me know if you come up with something useful. Never used that feature myself ?