How to use multiple translation files without domains in Twig in Symfony2?

Question

In the Symfony2 project, I'm working on, the translations are files in multiple domain files like

foo.en_GB.xlf
bar.en_GB.xlf
buz.en_GB.xlf
...
foo.de_DE.xlf
bar.de_DE.xlf
buz.de_DE.xlf
...
foo.fr_FR.xlf
...

So in the Twig files I have to define the domain, e.g.:

{% trans from 'my_domain' %}my_key{% endtrans %}

Actually I don't need the domains in this project. All the translations are part of one big domain. So, I want (1) to use multiple translation files and (2) in the same time not to care about the domain, so that

{% trans %}my_key{% endtrans %}

should work for the my_key translated in any /.../translations/*.xlf file.

How to use multiple translation files without domains in a Twig template in Symfony2?

Answer 1

This can be achieved by creating a custom loader without break nothing, all you need is to use a different file extension:

namespace AppBundle\Translation\Loader;

use Symfony\Component\Translation\Loader\XliffFileLoader;

class FooFileLoader extends XliffFileLoader
{
    /**
     * {@inheritdoc}
     */
    public function load($resource, $locale, $domain = 'messages')
    {
        // ignoring $domain var and pass 'messages' instead
        return parent::load($resource, $locale, 'messages');
    }
}

Register the translation loader:

services:
    app.translation.loader.foo:
        class: AppBundle\Translation\Loader\FooFileLoader 
        tags:
            - { name: 'translation.loader', alias: 'foo' }

Later, you must name all your files to:

bar.en_GB.foo
baz.en_GB.foo
bar.de_DE.foo
baz.de_DE.foo
...

All your translation files with .foo extension will be merged and included into messages domain.