Re: \class grob property

[Urs Liska]

Hi Paul,

thanks for this information.

This is indeed exactly what I was looking for and will make life easier 
for several things.

I think we'll be investigating the options in this year's GSoC project, 
maybe that will be helpful thinking about hierarchical stylesheets 
another way.

Best
Urs


Am 17.05.2018 um 14:15 schrieb Paul Morris:
> Hi Urs,
>
> On 05/13/2018 02:02 PM, Urs Liska wrote:
>
> > 1) for SVG output the objects would get the class assigned (along 
> > with an id). I don't have any idea yet how that is implemented, 
> > though. This will make it possible to work with CSS in a display 
> > environment.
>
> You'll be glad to know this is already supported in 2.19.  Check out 
> this grob property:
>
> |output-attributes| (list)
>
>    An alist of attributes for the grob, to be included in output files.
>    When the SVG typesetting backend is used, the attributes are
>    assigned to a group (<g>) containing all of the stencils that
>    comprise a given grob. For example, |'((id . 123) (class . foo)
>    (data-whatever . “bar”))| will produce |<g id=“123” class=“foo”
>    data-whatever=“bar”> … </g>|. In the Postscript backend, where there
>    is no way to group items, the setting of the output-attributes
>    property will have no effect.
>
>
> It's only documented in the internals reference.  I think it probably 
> gives you what you need to do what you want?
>
> I added this functionality to LilyPond awhile back while working on 
> 'lilypond-html-live-score'.  (Would like to find more time to do more 
> work with that, but...)  This code might be of interest: 
> https://gitlab.com/sigmate/lilypond-html-live-score/blob/master/grob-inspector.ily
>
> Cheers,
> -Paul
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