Create a generic plugin layer for CKEditor

Initially, we need:

• Generic plugin manager
• Generic plugin
• Way of communicating what provider that plugin uses
• Create plugin configuration from CKEditor admin config screen
• Possibly make those plugins permissions-enabled

Maybe I'm abstracting to much here and without knowing exactly how CKEditor returns the output (at cursor, over marked field etc), my guess is that its better if the plugin manager or an abstract base class takes care of the actual AjaxResponse and the plugin just needs to responde with some normalized outputs that could take text, html and potentially even images and files.

If there are some specified way of doing the output, like replace marked text or add at cursor, it could then be set a attributes or in some method of the plugin. That way, whoever creates a module doesn't need to learn how the different types of AjaxResponse works together with CKEditor.

So you basically have:
* Form method
* Form Validation method
* Form Submit method, that should return a object that can include text, html or image.

I'm not sure if there is some nifty way to also move marked text or marked image etc, into the form via context somehow. That would be cool if it was an easy solve.

Off tangent but what would also be awesome - if it is possible on top of that to have multiple plugin discovery in one plugin via a method, you can then expose the disposable entities from the Automator via a bridge module, so you can have very specific solution setup in minutes or via recipes. I could help you with this.

If that exists what we can do is (I hope its possible to follow):
1. Enable AI CKEditor, AI Automator, Unstructured and AI Automator CKEditor
2. Create a Automator entitiy bundle that you set to disposable (as in that its deleted after it runs) that has a file field, a text long and a formatted text long field.
3. Setup a rule on the text long field with the Automator "Unstructured: File to Markdown" so it fetches the content.
4. Setup a rule on the formatted text long field with the Automator "LLM: Prompt" where it prompts it to extract any tables and create it as HTML table markdown.
5. Then there is a configuration for CKEditor Automator where you choose that you want to expose this Automator Chain, you set that the input is the file field and the output is the formatted text field. Give it a title (and icon?) and save.
6. Go to CKEditor and its available to use, a form popups with the file form, you upload a PDF/JPG/Word file that has some table in it and it takes this and puts it formatted in the CKEditor field where the marker is.

(And this is just one out of probably 1000s of plugins you could dynamically setup without a single line of code)

I love the idea and it absolutely makes sense.

I think the same should also apply for the assistants in the sidebar. (ai_content).

I think this is in a pretty good spot to review. Some plugins may not have configuration, like Help, but I think that is okay.

I would like to apply this too for https://www.drupal.org/project/ai/issues/3462089 ✨ AI powered Spelling Fixer in ckeditor Needs review
but currently I don't know how to add my plugin.
Is there any docs I can add to the readme or something?

@Marcus I think we are ready here and it is in good enough shape. I left some comments and made some final additions. One annoying thing is that the entity autocomplete element in Drupal allows multiple inputs even if you limit it to 1, but that seems to be how core behaves.

#12 plugins can no longer be made in native CKEditor JS. You would have to review this MRs PHP plugins for an example. The closest one is probably the Completion or Summarize plugin in src/Plugin/AiCKEditor.

@kevinquillen - Looks good, feel free to merge with dev and set the ticket to fixed.

I've changed my spellcheck plugin for this new code.
But while testing I must say that personally the user interface of the new layer is substantially less easy to use than what is previously was.
The amount of clicks needed just to fix my spelling has tripled.
Also it does not seem to be streaming anymore?

Also the newlines in the suggested text are removed when clicking "save changes to editor" resulting in one big blob of text.

Amazing work on this, with this API it will be easier to create and extend plugins.

I do agree with @wouters_f that the decision to load the selectbox with plugins in a popover is not a good user experience. It would be better to load those options in the native CKEditor dropdown as before, and when clicking them we load the Drupal popover. Did you try that and run into any trouble doing it this way @kevinquillen?

I generally don't care to write JS for CKEditor, thats why. I put a POC in ✨ Add new CKEditor plugins to the drop down button in CKEditor toolbar Active , but it will need more work to be completed.

Thx I'll take a look today!

Automatically closed - issue fixed for 2 weeks with no activity.