added a sample noop to handle Drupal's twig-template specific filters/functions

[drzraf]

Can't even parse a Drupal template without this

[umpirsky]

This is covered in https://github.com/umpirsky/Twig-Gettext-Extractor#custom-extensions.

If you think people may find it useful, you can create a gist or separate repo and we can link it from README. What do you think?

[drzraf]

I think it:

• either it should be built-in Twig-Gettext-Extractor (more known framework extensions = more out of the box support)
• either the parser should be made generic-enough/relax-enough (Twig option for that?) to support translations extraction even if some unknown extensions/filters are hit
• either a generic parser should be built into GNU xgettext

Extraction is a low-level tool but a necessary step of Twig translation. Most user will prefer that this low-level tool does not depend on extension itself (even PoEdit or xgettext does not need extensions)

[umpirsky]

More known is pretty relative term. :)

I'm not aware of any way to tell twig to ignore undefined extensions.

I agree it would simplify setup in deed.