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Writing my own text editor, and daily-driving it
A programmer's text editor is their castle
New
The latest blog posts to take off on Hacker News. 49,188 posts.
2882
U+237C ⍼ Is Azimuth
One year ago, on 28 February 2025, Wikipedia user Moyogo updated the page for Angzarr with a citation to the type foundry H. Berthold AG’s 1950 symbol catalogue listing ⍼ as Azimut, Richtungswinkel , or “azimuth”, “direction angle”. Mystery solved!
2883
RISC-V Is Sloooow
143 vs 36 minutes is far too big difference
2884
Against vibes: When is a generative model useful
Let's suppose I wanted to answer a question: is the tool X useful for the task Y. If I were scientific about this, I would analyze the properties of tool X and develop a model, and the task Y and the requirements for it and develop a model, and I would us...
2885
Python: The Optimization Ladder
Python loses every public benchmark by 21-875x. I took the exact problems people use to dunk on Python and climbed every rung of the optimization ladder -- from CPython version upgrades to Rust. Real numbers, real code, real effort costs.
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I built a programming language using Claude Code
Over the course of four weeks in January and February, I built a new programming language using Claude Code. I named it Cutlet after my cat. It’s completely legal to do that. You can find the source code on GitHub , along with build instructions and example programs .
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Ad-tech is fascist tech
A core tenet of the enshittification hypothesis is that all the terrible stuff we're subjected to in our digital lives today is the result of foreseeable (and foreseen) policy choices, which created the enshittogenic policy environment in which the worst people's worst ideas make the most money:
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We are building data breach machines and nobody cares
A few weeks ago, my longstanding friend and colleague Curt Cunning mentioned to me that he was slogging through Nietzsche, which bespeaks his incredible will to power through things that are unpleasant (one of the many things that makes him an exceptional engineer). In any case, it lead me to revisit some of his work…
2890
Tony Hoare has died
Turing Award winner and former Oxford professor Tony Hoare passed away last Thursday at the age of 92. Hoare is famous for quicksort, ALGO...
2891
You gotta think outside the hypercube
A closer look at the tesseract and the ways we can render it on the screen.
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Rebasing in Magit
I read Ian Whitlock’s article on why he can’t quit Magit and it inspired me to share more about Magit from my perspective. This article will focus on rebasing.
2893
Show HN: How I topped the HuggingFace open LLM leaderboard on two gaming GPUs
ML, Biotech, Hardware, and Coordination Problems. Sometimes I write about hard problems and how to solve them.
2894
Levels of Agentic Engineering
AI's coding ability is outpacing our ability to wield it effectively. That gap closes in levels — 8 of them. Here's the progression from tab complete to autonomous agent teams.
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Using Thunderbird for RSS
It adds RSS to my primary communications application, which works great.
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Emacs and Vim in the Age of AI
It’s tough to make predictions, especially about the future. – Yogi Berra
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Two Years of Emacs Solo
Rahul's Blog
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No, it doesn't cost Anthropic $5k per Claude Code user
The viral claim that Anthropic loses $5,000 per Claude Code subscriber doesn't survive basic scrutiny. Let's do the actual maths.
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Tony Hoare has died
Limousin, Saint-Yrieix-la-perche, Périgord, Université, société, Livres, citations, Nantes, Jumilhac
2900
Rendezvous with Rama
Some musings on the novel "Rendezvous with Rama".
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So you want to write an “app” (2025)
I touched "every" OS so you don't have to
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The Cost of Indirection in Rust
Why 'indirection has a cost' is usually the wrong reason to inline and what actually costs you.
2904
Building a Procedural Hex Map with Wave Function Collapse
I've been obsessed with procedural maps since I was a kid rolling dice on the random dungeon tables in the AD&D Dungeon Master's Guide. There was something magical about it — you didn't design the dungeon, you discovered it, one room at a time, and the dice decided whether you got a treasure chamber or a dead end full…
2905
I don't know Apple's endgame for the Fn/Globe key–or if Apple does
The origin and the evolution of the most confusing modifier key
2906
An opinionated take on how to do important research that matters
An opinionated perspective on how to do important research that makes a difference (and sometimes win awards).
2907
Is legal the same as legitimate: AI reimplementation and the erosion of copyleft
Last week, Dan Blanchard, the maintainer of chardet—a Python library for detecting text encodings used by roughly 130 million projects a month— released a new…
2908
Understanding the Go Runtime: The Scheduler
In the previous article we explored how Go’s memory allocator manages heap memory — grabbing large arenas from the OS, dividing them into spans and size classes, and using a three-level hierarchy (mcache, mcentral, mheap) to make most allocations lock-free. A key detail was that each P (processor) gets its own memory…
2909
Okmain: How to pick an OK main colour of an image
You have an image but you want a colour
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