Use Case:
Suppose within my TiddlyWiki I'm rendering an infographic as SVG. The SVG
contains a path, which is defined by a string containing a list of
vertices. Suppose further I want to use an operation with at least one
<$list> widget to populate this path, as below. Because the path is an
attribute string, any transclusion into it will not be wikified. I can
paste transclusions together using macros, but that isn't practical for
lists. So is there a way to *force* wikification?
Obviously any HTML would be undesirable in the output, so I would need to
be able to use a render mode like the one which applies in this typed block:
$$$*text/vnd.tiddlywiki>text/plain*
<$list filter="[tag[Vertex]first[]]">M {{!!x}} {{!!y}}
</$list>
<$list filter="[tag[Vertex]rest[]]">L {{!!x}} {{!!y}}
</$list>
$$$
(I ran into this problem a few months ago while creating a graphical
timeline generator and never managed to solve it. I know this is possible,
because TiddlyWiki does something very similar to support customized
stylesheets with basic parsing rules -- but I've investigated how it's
done, and the mechanism uses calls to the rendering engine in core code
rather than any accessible macro. The discussion I started at that time
did not lead anywhere.)
As far as I can tell, all that would be necessary would be a macro to the
effect of:
<<*parse_and_render* {{MySVGCode}} text/vnd.tiddlywiki>text/plain>>
Which makes the appropriate calls into core code. Would this be reasonable
to request as a core feature? If not, is there a plug-in?
(I anticipate someone will mention that this is possible by way of storing
data to a temporary tiddler and then transcluding it. If so, I *would*
love to know how -- but I also point out that such is a significant
deviation from TiddlyWiki's "normal" way of rendering things and makes
unnecessary use of long-term storage. I'd also rather avoid "refresh"
trigger buttons.)
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