bug#60805: [PATCH] Extend go-ts-mode with command to add docstring to function

[Theodor Thornhill via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Theodor Thornhill <theo@thornhill.no>
>> Cc: Evgeni Kolev <evgenysw@gmail.com>,  dev@rjt.dev,  60805@debbugs.gnu.org
>> Date: Sat, 14 Jan 2023 12:43:21 +0100
>> 
>> Should we maybe generalize this into something all *-ts-modes can use?
>
> I don't know how widespread are such features with other languages.
>
>> Maybe it also could support some syntax to be used by for example
>> yasnippet?  There are examples on how to do so in eglot.el, if I'm not
>> mistaken.
>
> Maybe.  I'd have to see code to have an opinion.  Emacs never had such
> features, AFAIR.


From eglot.el:
```
(defun eglot--snippet-expansion-fn ()
  "Compute a function to expand snippets.
Doubles as an indicator of snippet support."
  (and (boundp 'yas-minor-mode)
       (symbol-value 'yas-minor-mode)
       'yas-expand-snippet))
```

So if yasnippet is available, it will be expanded.  We could have a
similar function in treesit.el, adding support for such "skeleton"
insertion features.  A simple example for javascript could be:

```
import ${2:$1} from '${1:moduleName}';
```

Which could be plugged into this patch, if I'm not mistaken.

Theo