Re: yank-media: allow users to limit image types that can be inserted

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 22 Sep 2024 13:53:06 -0300
> From: pinmacs <pinmacs@cas.cat>
> 
> I submitted the following Feature Request in the orgmode list [1]. They 
> said that the second part related to "limitting image types that can be 
> inserted" should be done in the core emacs side.
> 
> In that same thread [1], Ihor proposed different ways to implement it 
> [2], I also took how it explained the feature as part of this email-subject.
> 
> The thing is that with orgmode we can easily attach images to buffer 
> thanks to `yank-media' feature, but there is a dialogue we cannot skip 
> and that is: selecting image types. Find attached an image file 
> "selecting-image-types.png", where you can see the 7 candidates for a 
> screenshot I did to serve as an example.
> 
> 1. In case I want to be fast, I would like to skip that dialog entirely 
> and just use the image/png variant.
> 2. In another perspective, I would consider that the relevant decision 
> for a screenshot would be between two of them: image/png and image/jpeg
> 3. Another user could argue why the other 5 types are interesting in 
> general or for their particular use case...
> 
> ... but let's stop that discussion here. Looks like filtering image 
> types would be a useful customization for the users. If done as a 
> variable, in certain cases, that could be local binded and specific to 
> some fast function that immediately inserts an image, and in another 
> case, the global var would select only those image types relevant for 
> that particular user.
> 
> That is also positive if users want to add even more image types, with a 
> good and reasonable default, users will not worry about too many options 
> at some point.

Isn't this already possible by using yank-media-handler to register
only the handlers the Lisp program wants to handle?  If that doesn't
fit the bill, please explain why.

Thanks.