Message threading code

I don’t suppose anybody’s happened to implement jwz’s message threading
algorithm[1] in ruby?

Failing that, is anybody aware of any nice implementations elsewhere I
could look at, regardless of language? I’ve already looked at mutt’s
and Grendel’s.

References:
[1] http://www.jwz.org/doc/threading.html

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Thomas ‘Freaky’ Hurst - freaky@aagh.net - http://www.aagh.net/

Birth, n.:
The first and direst of all disasters.
– Ambrose Bierce, “The Devil’s Dictionary”