Re: [PATCH] gnu: graphviz: Enable Guile library.

[ludo@gnu.org (Ludovic Courtès)]

Roel Janssen <roel@gnu.org> skribis:

> I would like to add graphviz's Guile interface to the package
> definition.  This introduces two new (top-level) dependencies to the
> graphviz package: guile and swig.
>
> An example of the Guile interface:
> (load-extension (string-append (getenv "HOME") "/.guix-profile/lib/graphviz/guile/libgv_guile.so") "SWIG_init")

Doesn’t Graphviz provide a module that does this?  Would be more
convenient.

> ;; Define the graph's nodes and edges.
> (define my-graph (graph "G"))
> (edge
>   (node my-graph "A")
>   (node my-graph "B"))
>
> ;; Set a lay-out and render it to a file.
> (layout my-graph "dot")
> (render my-graph "svg" "/home/roel/my-graph.svg")

Indeed, I wonder why we didn’t try before.  :-)

> The patch is fairly straightforward, since all that is needed is include
> the dependencies to the inputs:

Could you check the output of ‘guix size’ before and after the change?

Thanks!

Ludo’.