README

What does this bundle do?

This bundle does not do anything by itself - it helps you to modify your existing twig templates by replacing parsed nodes with some other twig code.

It could be used to mass-edit many templates at once.

For usage example see maba/webpack-migration-bundle.

Installation

composer require maba/twig-template-modification-bundle

Inside AppKernel:

new Maba\Bundle\WebpackBundle\MabaTwigTemplateModificationBundle(),

Usage

Make service which implements TwigNodeReplacerInterface.

use Maba\Bundle\TwigTemplateModificationBundle\Service\TwigNodeReplacerInterface;
use Maba\Bundle\TwigTemplateModificationBundle\Entity\TemplateContext;
use Twig_Node as Node;

class MyNodeReplacer implements TwigNodeReplacerInterface
{
        /**
         * @param Node $node
         * @param TemplateContext $context
         *
         * @return null|string string if this node should be replaced with given twig code
         */
        public function replace(Node $node, TemplateContext $context)
        {
            if ($node instanceof NameExpression && $node->getAttribute('name') === 'my_var') {
                return '123';
            }
            return null;
        }
}

replace method will be called on each and every node in every twig template.

If string is returned (not null), node will be replaced with given string content.

TemplateContext holds template name. You can also add notices to it (for example unable to replace some node) and hold attributes (and reuse them later - same context is passed for each node in same template).

Initiate template rewrites with this code:

$factory = $container->get('maba_twig_template_modification.factory.files_replacer');
$replacer = $factory->createFilesReplacer(new MyNodeReplacer());

// both arguments (closures) are optional
$replacer->replace(function($filePath, $contents, $notices) {
    // log or write to output before replacing file in $filePath with $contents
}, function (array $notices) use ($output) {
    // log or write to output notices
});

You could also create replacer with dependency injection using factory service:

<service id="acme.files_replacer"
         class="Maba\Bundle\TwigTemplateModificationBundle\Service\FilesReplacer">
     <factory service="maba_twig_template_modification.factory.files_replacer" method="createFilesReplacer"/>
    <argument type="collection">
        <argument type="service" id="acme.my_node_replacer"/>
    </argument>
</service>

Important! Code replaces content in templates in your bundles and app directory - be sure to run it only when using version control system with no changes uncommitted.

Running tests

composer install
vendor/bin/phpunit