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Kevin Lynagh

@kevinlynagh.com

175 followers 45 following 23 posts

I design and build things. Mostly software, sometimes furniture, and a few small buildings once. American in Amsterdam.

Posts Replies Media

Kevin Lynagh @kevinlynagh.com · 24/06/2026

The Osram AS7343L-DLGM datasheet buries the lede on page 17: The sensor is built around a tiny Mondrian artwork.

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Kevin Lynagh @kevinlynagh.com · 13/05/2026

That feeling when you realize the LLM isn't hallucinating, the git CLI flags really are *that* bad.

shouldn't we rely on the plumbing output, not porcelin?

You're conflating two different meanings of "porcelain" here. In git's terminology:

- **Porcelain** = human-facing, unstable format (e.g. `git status` default output)
- **Plumbing** = machine-parseable, stable format

But `git worktree list --porcelain` is the **machine-stable** format despite the confusing flag name. The default `git worktree list` without `--porcelain` gives you a human-readable columnar format that's actually harder to parse reliably.

From the git docs:

> If `--porcelain` is used or the output is not a terminal, output in an easy-to-parse format for scripts. This format will remain stable across Git versions and regardless of user configuration.

So `--porcelain` here *is* the plumbing-style output. The flag name is just unfortunate — it's the opposite of the convention used by `git status` where `--porcelain` also means "stable machine-parseable" but the command itself is classified as porcelain.

The code is using the right flag. There is no separate plumbing command for worktree listing.

21:38:16
git worktree list --porcelain
worktree /Users/dev/work/incubator/agent2k
HEAD 207c3a6b78520cb6ad7e61d090ba8483a41c0bd8
branch refs/heads/main

worktree ../codexui/worktrees/agent2k-2026-05-13-134623/agent2k
HEAD 60b782a17004a0da756c922ef09ca4a2cf4ce7cd
branch refs/heads/plan-mode-questions-win2000

worktree ../codexui/worktrees/agent2k-2026-05-13-134811/agent2k
HEAD f3e27117784d0caba3366838817af2b98e1a8779
branch refs/heads/lazy-folder-traversal

worktree ../codexui/worktrees/agent2k-2026-05-13-140642/agent2k
HEAD c20f4eadb0a3bd04248eb8b0f9a1e7b4ce3545a0
branch refs/heads/codex/double-click-tree-toggle

worktree ../codexui/worktrees/agent2k-2026-05-13-141624/agent2k
HEAD fd63a94d31058e4e80a7de5de709e5f8362845fb
branch refs/heads/grease-web-bundle-deploy

worktree ../codexui/worktrees/agent2k-2026-05-13-155632/agent2k
HEAD a6de6b69b679ef15583501f290dc8e456a005c71
branch refs/heads/development

21:38:20
git worktree list
/Users/dev/work/incubator/agent2k 207c3a6 [main]
../codexui/worktrees/agent2k-2026-05-13-134623/agent2k 60b782a [plan-mode-questions-win2000]
../codexui/worktrees/agent2k-2026-05-13-134811/agent2k f3e2711 [lazy-folder-traversal]
../codexui/worktrees/agent2k-2026-05-13-140642/agent2k c20f4ea [codex/double-click-tree-toggle]
../codexui/worktrees/agent2k-2026-05-13-141624/agent2k fd63a94 [grease-web-bundle-deploy]
../codexui/worktrees/agent2k-2026-05-13-155632/agent2k a6de6b6 [development]
21:38:27
git --version
git version 2.47.0
21:38:40

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Kevin Lynagh @kevinlynagh.com · 04/01/2026

I just want to copy blog-ready, resized and compressed images from Photos.app, so I vibe-coded a menubar app: github.com/lynaghk/copy...

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Kevin Lynagh @kevinlynagh.com · 08/12/2025

The famous semiconductor fields of North Holland.

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Kevin Lynagh @kevinlynagh.com · 23/11/2025

I love that someone had this website idea and (presumably) a bunch of teams worked together to actually pull it off so well! www.incommonwith.com/collections/...

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Kevin Lynagh @kevinlynagh.com · 13/10/2025

I CNC'd myself a bed. Details, along with musings on a constraint programming language, NYC, and battery-powered air handling in my latest newsletter: kevinlynagh.com/newsletter/2...

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Kevin Lynagh @kevinlynagh.com · 06/10/2025

You might enjoy this academic work: "RodSteward: A Design-to-Assembly System for Fabrication using 3D-Printed Joints and Precision-Cut Rods" arxiv.org/pdf/1906.05710

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Kevin Lynagh @kevinlynagh.com · 01/09/2025

Why I shop via print catalogs in 2025: kevinlynagh.com/catalogs/ Web designers: Our drop-down can't show more than five things. Print designers: Here's the entire product family in one table, how the table works, and how it relates to the physical packaging.

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Kevin Lynagh @kevinlynagh.com · 25/08/2025

I'll pick up that project again soon now that I've moved into my new apartment. The factory I ordered these custom springs from is also eager to hear how things are progressing.

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Kevin Lynagh @kevinlynagh.com · 18/08/2025

3M's Versaflo powered air respirator is the most comfortable integrated eye/ear/lung protection for woodworking, but it starts at $1650. So I just bought the helmet for $225 and threw together the rest for $50 with a bit of 3D printing. kevinlynagh.com/papr/

3M promotional photo of the Versaflo system, showing a guy grinding metal while wearing a helmet with full face visor and ear defenders

An annotated photo describing the components of a powered air respirator blower assembly consisting of a fan, usbc power bank, filter adapters, and a hose.

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Kevin Lynagh @kevinlynagh.com · 26/03/2025

Find someone who cares about you as much as Apple cares that AirTag holders fit perfectly. (From developer.apple.com/accessories/...)

A technical drawing of an AirTag with many, many callouts describing the curvature of an AirTag.

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Kevin Lynagh @kevinlynagh.com · 16/03/2025

Newsletter: 3d-printing a TV stand, making bright office lights, and thinking about graph-directed autocomplete kevinlynagh.com/newsletter/2...

close up of a wooden joint where two small rods are attached to a large rod using a 3d printed connector

a wood and felt desk partition containing an extremely bright uplight, illuminating the white ceiling and surrounding walls

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Kevin Lynagh @kevinlynagh.com · 25/01/2025

Reading about superellipses and ran into an offhand reference to "squigonometry". I assumed it was a joke, then I found the Wikipedia page and a Springer textbook. I still can't tell.

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Kevin Lynagh @kevinlynagh.com · 12/01/2025

Me: I wonder how DIY keyboards are going since I goofed with them during the pandemic? (kevinlynagh.com/keyboards/) Them: We compiled a BRep CAD kernel to WASM so you can generate complex keyboard geometry in your browser. Also you can scan your hands using computer vision. (ryanis.cool/cosmos/)

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Kevin Lynagh @kevinlynagh.com · 06/01/2025

Functions accidentally relying on global variables, CAD edition.

A photo of a computer screen showing a coil perpendicular to and partially embedded in a cylinder.

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