Provide a Twig extrafield type

Here's a valid use-case: ✨ Provide a token "Link" type Needs work

Twig would be super handy for cases where you need more complex markup, for example a button. If you finally need to be able to translate parts of the labels, then the textarea solution isn't flexible enough anymore. So I totally agree with the others here, a Twig type would be super powerful! 🦾🦸

@Grevil: Rendering can simply be done using https://www.drupal.org/node/2311123 →

What I'm not yet sure about is, which variables we should add to the twig #context (is the entity available here, where the field is added on?) and if we should run the result through token replacement (maybe as option?) We should then add a note that token replacement happens after twig rendering.

In result this means that tokens can't replace twig variables functionally. Best would be to have both so.

All done, please review! I'll do some manual testing, while this can get reviewed already! 👍

GREAT work @Grevil! I left some comments :)

@droath would you be fine with that, once it's finished? What do the others here think?

@Grevil! Much appreciated, I've been waiting to implement this feature for a while! :)

@Anybody Yes, once those issues are resolved and marked as reviewed by the community, I'll merge this into the dev release.

@Anybody and I discussed the token support internally, and we agree, that the twig context variables are the better approach, making the token support obsolete.

We inject a few global variables and the entity itself as context from the get-go and if the user needs even more context variables, he can easily implement "hook_entity_extra_field_twig_context_alter" to provide even further context variables!

Furthermore, the UX doesn't suffer from having no states available for the token tree.

In the end, @droath should decide! :)

Note, that if we want to merge the old implementation WITH token support some few more additions need to be made to that branch (e.g. schema).

Great work @Grevil, just left some final comments. I agree we should leave out tokens here for now and use Twig context, which is even more powerful. If tokens will ever be needed, someone can take the alternative MR and revive it as follow-up. We shouldn't do this for unsure benefit.

grevil → changed the visibility of the branch 3064638-provide-a-twig to hidden.

GREAT! RTBC!

@droath would you mind having a look and merge this? Maybe tag a new release afterwards? Would be great to have this GA!

@droath any chance to merge this and tag a new release? :)