[Oberon] Graph of module imports

[Jan de Kruyf]

Hallo,
Here is a small toy to draw pretty pictures, together with a sample output.

The sample is a reduced graph. It is also possible to draw every import as
a vector, but then the drawing gets a bit cluttered.

There is a short write up in the source file.

You need graphviz to see the output:

apt-get install graphviz

on my debian system.

Enjoy,

j.
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