Re: RTF import/export emacs (was: New Emacs features via Google Summer of Code (or other similar stipend schemes))

[Jim Porter <jporterbugs@gmail.com>]

On 8/18/2024 11:16 AM, Eli Zaretskii wrote:
>> Date: Sun, 18 Aug 2024 10:37:51 -0700
>> Cc: acorallo@gnu.org, emacs-devel@gnu.org, stefankangas@gmail.com
>> From: Jim Porter <jporterbugs@gmail.com>
>>
>> EWW/shr.el don't actually use slicing for flowing text, as far as I
>> know. I suppose that could work, but I'd be worried about
>> miscalculations causing the slices to be misaligned (for example if we
>> tried to support the CSS 'float: right' property).
> 
> Using :align-to should allow us to align the slices horizontally (if
> that is what you had in mind).

My worry was that if you had this,

   This is some text   [image slice]
   that goes on        [image slice]
   multiple lines.     [image slice]

we'd have to be very careful. Text-scaling is probably the biggest risk. 
If you enlarge the text, the line-height changes, which would probably 
break things (though I guess we could scale the image too).

In any case, we can cross this bridge when we get to it.

> I say let's start from the text parts: the fonts, the faces, the
> indentation, the numbered and unnumbered lists, etc.  If we can pull
> that out, we will already have a terrifically useful feature.

I agree. SHR has already implemented these[1], so it would probably be a 
good source of ideas for how to render these parts. Maybe we could even 
pull some of the code out into a common file.

[1] There's no CSS support though, so in practice, most web pages these 
days end up using the default font with SHR.