ganja.js
src
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ganja.js
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The Montreal Problem: Why Programming Languages Need a Style Czar
Some people's brains just work this way. Here's an example of a somewhat popular and regularly maintained library written in a similar style: https://github.com/enkimute/ganja.js/blob/6e97cb45d780cd7c66...
Once your learn to recognise the commonalities, you'll see examples everywhere. The most extreme and stereotypical version is the billboards written by some homeless people. You can probably picture it already in your mind's eye: A wall of very dense text with little whitespace or structure, and a mix of fonts and colours seemingly at random.
I had a brilliant mathematician friend who wrote like this. He would squeeze and entire semester's worth of study notes into a single sheet of paper, on one side. It was impenetrable gibberish to everyone else, but the colours and 2D positioning let him build a mental mind-map.
For people like this, if you reformat their code even a tiny bit, their mental map is invalidated, and they lose track of it completely and become upset. I discovered this (the hard way) when applying automatic code formatting tools to the codebases I mentioned previously.
Personally, I find this type of thing to be absolutely fascinating, because it's the intersection of many fields of study, and hence is under-studied. There's elements of pedagogy, psychology, literacy, compute science, etc...
It's an open question how we can get large groups of neurodiverse humans to collaborate on a codebase when they don't even "read" or "think" in compatible ways!
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[Media] I finished my first rust project: a path tracer
I was watching bivector videos and how it could be a viable replacement for matrix algebra in video games and I have been very impressed by the intuitiveness and consistency of the equations. There is this ganja.js for demonstrating the graphics and has a rust generated code https://github.com/enkimute/ganja.js/tree/master/codegen/rust I'm too naive to understand the implementation, but I'm glad a library like ultraviolet is here to start paving the use of Geometric Algebra in computer graphics.
- Ask HN: What are some examples of elegant software?
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Manim: An animation engine for explanatory math videos
Well I've been on a real Geometric Algebra (aka Clifford Algebra) kick lately, and ran across ganja.js [1]. It's a single no deps file that is...impressive. 120k uncompressed, and with it you can construct any degree algebra (including the more esoteric hyperbolic/parabolic ones), render to canvas, svg or webgl(!). It also includes a clever little DSL parser and interpreter (it overloads the scientific notation to name basis vectors!) that lets you construct more complex things from simple things using various kinds of products.
The author, Steven De Keninck, is quite impressive as well, having got his start in the demoscene some time ago. He has a good video from 2019 that explains why this algebra is better than [matrices, tensors, vectors, complex numbers]. Of particular interest (to me anyway) is the 2D projective geometry.
I don't want to oversell it, but ganja is fucking amazing and there is a great deal I want to do with it. For one, I'd like to recapitulate my physics degree with it.
[1] https://github.com/enkimute/ganja.js
[2] https://www.youtube.com/watch?v=tX4H_ctggYo
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Ganja.js: Geometric Algebra Generator for JavaScript
Great documentation!
- Ganja.js: Geometric Algebra Generator for JavaScript, C++, C#, Rust, Python
src
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OpenBSD Upgrade 7.3 to 7.4
The OpenBSD project released 7.4 of their OS on 16 Oct 2023 as their 55th release đź’«
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OpenBSD System-Call Pinning
Well since https://www.openbsd.org/ still says
> Only two remote holes in the default install, in a heck of a long time!
I'm assuming not, but I could always be mistaken.
- Project Bluefin: an immutable, developer-focused, Cloud-native Linux
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From Nand to Tetris: Building a Modern Computer from First Principles
> building a cat from scratch
> That would be an interesting project.
Here is the source code of the OpenBSD implementation of cat:
> https://github.com/openbsd/src/blob/master/bin/cat/cat.c
and here of the GNU coreutils implementation:
> https://github.com/coreutils/coreutils/blob/master/src/cat.c
Thus: I don't think building a cat from scratch or creating a tutorial about that topic is particularly hard (even though the HN audience would likely be interested in it). :-)
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OpenBSD – pinning all system calls
> I don't know how they define `MAX`, but I'm guessing it's a typical "a>b?a:b"
Indeed: https://github.com/openbsd/src/blob/master/sys/sys/param.h#L...
> Then `SYS_kbind` seems to be a signed int.
It's an untyped #define: https://github.com/openbsd/src/blob/master/sys/sys/syscall.h...
I believe your whole analysis is correct, that running an elf file with an openbsd.syscalls entry with .sysno > INT_MAX will allow an out-of-bounds write.
- Une nouvelle mise à jour de Systemd permettra à Linux de bénéficier de l'infâme "écran bleu de la mort" de Windows, mais la fonctionnalité a reçu un accueil très mitigé
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tmux causing ANSI color-response garbage on attaching?
I can reproduce it. And this is the commit that causes the issue: https://github.com/openbsd/src/commit/d21788ce70be80e9c4ed0c52c149e01147c4a823
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Sudo-rs' first security audit
This doesn’t really change your conclusion, but I think that’s the wrong file. This is the real doas afaict: https://github.com/openbsd/src/blob/master/usr.bin/doas/doas...
Still just a tidy 1072 lines in that folder though.
I spent 5 minutes staring at your file trying to understand how on earth it does the things in the man page, but of course it doesn’t.
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OpenBSD: Removing syscall(2) from libc and kernel
OpenBSD developers are making serious effort to kill off indirect syscalls, the base system is completely clean, take a look at the work Andrew Fresh did to adapt Perl. He write a complete syscall "dispatcher" or emulator for the Perl syscall function so that it calls the libc stubs.
https://github.com/openbsd/src/commit/312e26c80be876012ae979...
The ports tree is also being cleansed of syscall(2) usage, until they're all gone.
msyscall, pinsyscall, recent mandatory IBT/BTI, xonly. OpenBSD is making waves, but people aren't really seeing them yet.
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"<ESC>[31M"? ANSI Terminal security in 2023 and finding 10 CVEs
Actually, I got it wrong, too many vulnerabilities in flight. They did fix it: https://github.com/openbsd/src/commit/375ccafb2eb77de6cf240e...
What are some alternatives?
manim - A community-maintained Python framework for creating mathematical animations.
cosmopolitan - build-once run-anywhere c library
manim - Animation engine for explanatory math videos
bastille - Bastille is an open-source system for automating deployment and management of containerized applications on FreeBSD.
perspective - A data visualization and analytics component, especially well-suited for large and/or streaming datasets.
buttersink - Buttersink is like rsync for btrfs snapshots
Stockfish - A free and strong UCI chess engine
PHPT - The PHP Interpreter
r2vr - R to Virtual Reality
Joomla! - Home of the Joomla! Content Management System
TermKit - Experimental Terminal platform built on WebKit + node.js. Currently only for Mac and Windows, though the prototype works 90% in any WebKit browser.
ctl - The C Template Library