[hakyll] Image generation from in-line graphviz source

[Jasper Van der Jeugt]

A simpler solution here is probably inlining the images.

<img alt="Embedded Image"
src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIA..." />

Hope this helps,
Peace,
Jasper

Hi,
I'm relatively new to Hakyll, and I'd appreciate some guidance how to
implement a Pandoc transformer that renders in-line Graphviz code blocks
as PNG images. Basically, I'd like to contain my Markdown documents
| ~~~~~~~~~~~ {inline="dot"}
| digraph g {
| rankdir = LR
| 0 [label = "0"]
| 1 [label = "1"]
| 0 -> 1 [label = "1"]
| 0 -> 0 [label = "0"]
| 1 -> 1 [label = "1"]
| 1 -> 0 [label = "0"]
| }
| ~~~~~~~~~~~
Now, the output HTML document should show an image of the rendered
graph, of course, and I reckoned this can be implemented in a
transformer for 'pandocCompilerWithTransformM'. My problem is, though,
that while compiling the document, say "foo.mdwn", I have to create
output rules for all the graphs I've encountered, i.e.
"foo-graph-1.png", "foo-graph-2.png", and so on. I'm not sure how that
would be accomplished, because it seems like a Compiler (Item a)
computation cannot produce more than one output item.
Looking at the API, I believe that "versions" may be the answer to this
problem, but I', not really sure and I haven't found any documentation
yet that explains what versions really are and how they're supposed to
be used. So I wonder: am I on the right track with that approach?
Is there an altogether simpler solution that I've overlooked? Has anyone
implemented something like this already?
I'd appreciate any advice and feedback I can get.
Best regards,
Peter
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[Jasper Van der Jeugt]

Hey Peter,

I think the "proper" way to do this would be creating a new datatype
which holds the contents of multiple files, and then add a nice
`Writable` instance.

Peace,
Jasper

Hi Jasper,

Post by Jasper Van der Jeugt
A simpler solution here is probably inlining the images.
<img alt="Embedded Image" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIA..." />

oh, very cool. I had no idea that this is possible!
Out of curiosity, though, what approach would I have to take with Hakyll
to extract an unknown number of source files from another source file in
a proper way? Is there a way to do that?
Best regards,
Peter
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