Meta-update and GNU epsilon news – 2012-08-29 23:33 (last update: 2012-09-16 13:38)

An ag(e)ing hacker — Luca Saiu's blog

Meta-update and GNU epsilon news

This little diary of mine needed some love.

A good excuse to motivate myself to write more often comes from the idea of syndication in the GNU Planet (; to make that possible without adding off-topic stuff to the GNU site I’ve recently improved trivalblog to also support per-tag RSS and Atom feeds — the idea being, of course, to have only posts explicitly tagged as “gnu” linked from the planet.

My little blog system is described in The trivialblog software ( It’s just a quick unpolished hack with no documentation built upon bash and Texinfo, but I find it useful nonetheless. In case you’re interested you can get it from its bzr repo:

bzr branch

GNU epsilon

Speaking of experimental software, after working on a private repo for a long time I’ve finally pushed the GNU epsilon sources to Savannah: The software is definitely not for the faint of heart in its current state, but fellow Lispers and language jocks might already have some fun with it.

bzr branch bzr://

I hadn’t make any public announcement before. I created the public branch on Savannah right before my impromptu epsilon talk at the recent Düsseldorf GHM (, showing it to the people who were physically present. Now you know it’s there as well: play with it if you want, and please let me know if you have any constructive comments.

I plan to use this space to speak informally about my practical epsilon hacks, so that people can see how things are done in practice. Or just me hearing myself speak if you will, which is useful anyway to gauge the presentation style. Think of this as a preliminary form of hands-on documentation, before the software is stable enough for me to start writing the real Texinfo documentation.

My forthcoming PhD thesis will also be useful for understanding epsilon, including its philosophical rationale. Unfortunately the document has not ended up as universally accessible as I would have liked. I suppose there isn’t much I can do: the system is simple but not trivial, and some formalism is ultimately necessary. I hope the non-mathematical part will be of interest to a broader public.

epsilon is a very, very small language. But it’s surprisingly hard to introduce informally because of its idiosyncratic nature, which needs many preliminary explanations.

My short-term to-do list for epsilon contains a lot of fun items:

In some unspecified order.

— Luca Saiu, 2012-08-29 23:33 (last update: 2012-09-16 13:38)

english, epsilon, gnu, hacking, meta

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Luca Saiu

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