Re: Link preview generation with new link preview property

[Björn Bidar]

Karthik Chikmagalur <karthikchikmagalur@gmail.com> writes:

>> The PR do port the package to this new handler property:
>> https://github.com/gaoDean/org-remoteimg/pull/4
>>
>> However it left me with a few questions:
>> - Who is supposed to take care of the scaling/width of the preview
>>   image, the handler or the caller of the handler?
>
> The handler is responsible for sizing the image.  The reason for this is
> that the preview does not have to be an image -- it can be any kind of
> overlay decoration.
>
> If you decide to use an image file as the preview, you can call
> `org-link-preview-file' inside your handler to handle the geometry for
> you.  This includes the size and alignment specified by #+attr_*
> keywords, `org-image-max-width' and `org-image-align'.
>
> If you are using a preview image from image data, you'll have to copy
> some of the code in `org-link-preview-file' to your handler if you want
> to respect these user options.

Would it be possible to also handle image data in the function or
refactor the org-link-preview-file function in a way that the geometry
handling is done in a helper function which can be reused by other
handlers.

In the example I mentioned it should be possible to use the cached file
from the url cache but that might be not so easy in other cases.

>> - When calling the link preview function for a description with prefix
>>   argument 1 I noticed that it doesn't get the contents of the
>>   description.
>>   Why is that? In this instance the link looked like this:
>>   
>> [[https://stable.melpa.org/#/rpm-spec-mode][file:https://stable.melpa.org/packages/rpm-spec-mode-badge.svg]]
>
> I don't follow.  What do you mean by "it doesn't get the contents"?  Did
> the preview work as expected when you used a prefix arg of 1?

The link element passed towards the handler didn't contain the
description e.g. in this case 
file:https://stable.melpa.org/packages/rpm-spec-mode-badge.svg.