Re: Cutoff date for adding ruby-ts-mode?

[Dmitry Gutov <dgutov@yandex.ru>]

On 02/01/2023 20:44, Juri Linkov wrote:
>>> Sorry for the delay, ruby-ts-mode is now in emacs-29.
>>
>> Thanks.
>>
>>> Some rough edges around indentation remain (to be addressed in the
>>> coming weeks), but the mode should be useful enough now.
>>
>> Good plan.
> 
> I confirm that everything in ruby-ts-mode works great.
> Thanks Perry and Dmitry.  One question is how to share
> configuration between ruby-mode and ruby-ts-mode.
> 
> I guess since only one of modes makes sense within the
> same session then the same hook could be run only
> for one of these modes, selecting one on them
> with `treesit-available-p' (note that `treesit-ready-p'
> can't be used until treesit is loaded):
> 
>    (add-hook (if (treesit-available-p) 'ruby-ts-mode-hook 'ruby-mode-hook)
>              (lambda ()
> 
>                (when (treesit-available-p)
>                  ;; Copied from `ruby-mode' for `ruby-ts-mode':
>                  (setq-local outline-regexp (concat "^\\s *"
>                                     (regexp-opt '("class" "module" "def"))
>                                     "\\_>"))
>                  (setq-local outline-level (lambda () (1+ (/ (current-indentation)
>                                                ruby-indent-level))))
>                  (add-hook 'flymake-diagnostic-functions #'ruby-flymake-auto nil 'local))
> 
>                ;; Other common settings
>                ;; ...
>    ))
> 
> Also the problem is that the default settings seen above
> are not shared between modes.

Good question, thanks. I've pushed a change in 6dd3e352f44 that moves 
the common code to a common base mode to derive from.

Those include the settings you quote above, as well as the setup for 
electric-indent-functions and prettify-symbols-alist.

And to answer the question itself, I guess you can use 
ruby-base-mode-hook now.