Re: d3js chord diagrams

[Ricardo Wurmus <rekado@elephly.net>]

Ludovic Courtès <ludo@gnu.org> writes:

> Hey Ricardo,
>
> Ricardo Wurmus <rekado@elephly.net> skribis:
>
>> I’ve built something:
>>
>>     http://elephly.net/graph.html
>
> What happened to this neat hack we discussed in October?  :-)

The current “export-graph” procedure writes the graph representation to
a port by calling output procedures provided by the graph backend.  With
this interface I cannot generate a complete HTML file using a gexp
unless I add a special case for the d3 backend.

I’ve tried to accumulate the node representations as a string with
“with-output-to-string” (to embed it in a gexp for the HTML file), but I
couldn’t get this to work.  (All output I could capture was what
“emit-prologue” would write to the port.  It does this outside of the
monad anyway.)

I also tried and failed to use an “origin” and “computed-file” in
“export-graph”.  “export-graph” should return a monadic value, but I
don’t really understand the monad implementation in Guix.  What monadic
value would be appropriate to actually cause a download of the origin
and storing of the computed-file?

Do I need to return “(lower-object (computed-file …))”?  That’s a
monadic value, but nothing happens to it inside of “(run-with-store …)”
in guix/scripts/graph.scm.  When returning the result of “gexp->file”
(instead of “computed-file”) as the return value of “export-graph” still
nothing happens.

Really thought this would be trivial.  Any recommendations?  I feel like
I’m just missing one little thing to make things happen.

-- 
Ricardo
  
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