Hacker News: Sagi21805

New comment by Sagi21805 in "Building Rust Procedural Macros from the Grounds Up"

Sagi21805 — Sat, 06 Jun 2026 18:52:16 +0000

Said the inner block inside the for loop could not be a function, because break does not mean anything not inside a loop, but the macro, which seems like a function, injects it into the code which is inside a loop, which is valid

New comment by Sagi21805 in "Building Rust Procedural Macros from the Grounds Up"

Sagi21805 — Sat, 06 Jun 2026 18:50:16 +0000

That's really cool, I was not familiar with this and will look into it!

New comment by Sagi21805 in "Building Rust Procedural Macros from the Grounds Up"

Sagi21805 — Sat, 06 Jun 2026 17:27:36 +0000

Thanks!

Couldn't agree more, both on proc macros and operating system, I did not find sufficient information on the internet. That is exactly the purpose of this book.

New comment by Sagi21805 in "Building Rust Procedural Macros from the Grounds Up"

Sagi21805 — Sat, 06 Jun 2026 17:10:11 +0000

Yea that's sound about right

The macro explained in that section was mainly for me to learn macros, and save up some boilerplate with nice syntax.

New comment by Sagi21805 in "Building Rust Procedural Macros from the Grounds Up"

Sagi21805 — Sat, 06 Jun 2026 16:58:26 +0000

Thanks for the warming comment!

New comment by Sagi21805 in "Building Rust Procedural Macros from the Grounds Up"

Sagi21805 — Sun, 31 May 2026 19:28:49 +0000

During the development of Learnix operating system I needed to represent bitflags inside some structures.

While there were alternatives with 3rd party libraries, the goal of the project is to implement and learn as much as I can.

Most of the guides I found online explained the concept great, but created only a simple macro as an example. So I decided to write about it myself too, with a real usage to create a bitfields attribute proc-macro, that takes a struct and turns it into bitfields.

Hope you will have a great read!

Building Rust Procedural Macros from the Grounds Up

Sagi21805 — Sun, 31 May 2026 19:28:49 +0000

Article URL: https://www.learnix-os.com/ch02-03-implementing-the-bitfields-proc-macro.html

Comments URL: https://news.ycombinator.com/item?id=48348876

Points: 88

# Comments: 18

New comment by Sagi21805 in "[dead]"

Sagi21805 — Wed, 13 May 2026 06:03:57 +0000

Hi! This is a project that I am working on for quite a while.

The main goal is to teach operating systems and Rust.

This is still 'beta' and a lot of things are missing (especially Rust chapters) but I would like to know what you think if it :)

New comment by Sagi21805 in "Ask HN: What are you working on? (May 2026)"

Sagi21805 — Sun, 10 May 2026 20:01:11 +0000

I am working on the Learnix operating system (https://gitHub.com/sagi21805/LearnixOS) Mainly an educational project, to understand and teach about OS and Rust concepts (The OS is written in Rust)

https://www.learnix-os.com

New comment by Sagi21805 in "LearnixOS"

Sagi21805 — Sat, 27 Dec 2025 07:00:33 +0000

I plan to cover more, like disk drivers, file systems, processes, shell, user space, processes, until we can run a working program!

Hopefully, also networking

New comment by Sagi21805 in "LearnixOS"

Sagi21805 — Sat, 27 Dec 2025 06:55:45 +0000

This project started because I wanted to understand the linux that sits on my computer, which is x86. There is a possibility that on the future it will have multiple architectures supported, probably starting with arm, but I can't promise that

New comment by Sagi21805 in "LearnixOS"

Sagi21805 — Fri, 26 Dec 2025 23:43:22 +0000

You are correct, and it will be fixed!

New comment by Sagi21805 in "LearnixOS"

Sagi21805 — Fri, 26 Dec 2025 21:20:56 +0000

Because I didn't really publish it, I didn't check all the grammar and type errors

This is something I will improve when the initial release will come

New comment by Sagi21805 in "LearnixOS"

Sagi21805 — Fri, 26 Dec 2025 20:40:45 +0000

That's actually an interesting idea, the main reason is that I wanted to take a doom port that is posix compliant and see if I can make it run

New comment by Sagi21805 in "LearnixOS"

Sagi21805 — Fri, 26 Dec 2025 20:38:08 +0000

When I started writing this OS, Rust was a pain, and I needed to understand a lot of things that I didn't know about the language, I can flag on some sections that people can skip because they are more language related, but I think that it is very important, and can be beneficial to people that come from other languages, or to people that want to understand rust more deeply.

In every chapter I try to initially explain the topic and then implement, or something in between. but I think the implementation is important because it completes the picture.

New comment by Sagi21805 in "LearnixOS"

Sagi21805 — Fri, 26 Dec 2025 20:26:54 +0000

I like the current name and already have the domain :|

New comment by Sagi21805 in "LearnixOS"

Sagi21805 — Fri, 26 Dec 2025 20:25:03 +0000

Will do!

New comment by Sagi21805 in "LearnixOS"

Sagi21805 — Fri, 26 Dec 2025 20:24:10 +0000

Hi! I am the developer of this, and I really appreciate the feedback!!

The book is still on development and this is why I didn't even publish it here, I just recently finished the highlighter which was a lot of work, and I probably will require more.

Currently I am trying to make book and OS unique by developing and creating an explanation on AHCI, which I didn't see much on the internet. And then I try to handle all of the grammar, and typos