Miloš Kozák

My used-to-be-loved projects, refreshed with Claude

Wed, 16 Sep 2026 00:00:00 +0000

In 2018 I wrote a small DokuWiki plugin that embeds draw.io diagrams into wiki pages. Then life happened. Issues kept arriving, and every time I looked into my github profile I felt bad about it and did nothing, because I stopped using it around 2021. The plugin is still in the top 5 % of the DokuWiki plugin catalogue by popularity, people fork it and fix it for themselves. Download counts are still rising as people are still using it.

So the experiment was not “can AI write a feature”. It was: can I set up a flow where agents integrate external changes, fix issues, and keep the thing alive, with me doing only the validation? And it would not be me if I did not want the basic features under tests, so I know exactly what is breaking and what is not.

I have mixed feelings about how it went. I started on Sunday evening and ran the first day from my phone, so I could not test anything, and Claude was confident everything was going fine. When I got to the computer, I realised that everything works and nothing works at the same time.

All I wanted was to see inside an ArrayList — but now you can too!

Mon, 10 Aug 2026 00:00:00 +0000

I’m learning Zig. I chose a HOCON parser as my intro project. I am writing it from scratch and the parser core is mine, no AI writing it for me, because typing the code myself is the whole point. AI is my mentor: it shows me the proper idioms, helps me prepare tests, and generates auxiliary tools — e.g., Java and Python parsers to check compatibility.

Very soon I realized I was learning a systems language without a debugger. Not having a good debugger is like learning anatomy from a book with the pictures torn out. I don’t want std.debug.print archaeology. I want to put a breakpoint into my parser, run one test, and look at my ArrayList.

That turned out to be a bigger ask than I expected.

Smart Water Management System (DIY)

Sat, 12 Jul 2025 00:00:00 +0000

(The full ESPHome config and wiring live in lejmr/dyi-ha-water-management.)

I have a 16m³ underground concrete rain water tank, a well, and a cellar that sits uncomfortably close to both. When the groundwater rises, it finds its way through the concrete and into the cellar — so I wanted a system that watches both water levels and runs the pump before the water starts redecorating. And since it irrigates the lawn anyway, the water doesn’t even go to waste.

AWS Directory Service: seamless domain join (a time capsule)

Sun, 24 Jan 2021 00:00:00 +0000

Disclaimer, 2026: I would build this differently today — much more of the early pipeline would be plain shell scripts doing the automation, so the whole thing gets shorter right at the start.

Motivation

This story lives as a GitHub repository where I keep track of actual infrastructure configuration and this text. I will be very grateful if you consider sending pull-requests with either infrastructure configuration or textual changes there. It would be so great if this initial try changed into something anybody can effortlessly use in infrastructures.

CAROBS: the OMNeT++ simulator behind my PhD

Thu, 29 Sep 2016 00:00:00 +0000

(Published as lejmr/carobs — this post is its README with a bit of context.)

A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral. — Antoine de Saint-Exupéry

This is the source of the all-optical network simulator I built during my PhD, based on the OMNeT++ event-driven simulator. It implements CAROBS, an Optical Burst Switching (OBS) framework that concatenates bursts into “cars” for better link utilization. CAROBS itself comes from Thomas Coutelen’s 2010 Concordia thesis — I built on his architecture during my stay in Brigitte Jaumard’s lab in Montreal.