Crate of the Week

See optimized assembly of any function in your program. It's like a local version of Useful for optimizing (even for non-asm-experts).


I'd like to nominate Oort.

Oort is a "programming game" where you write Rust code to control a fleet of spaceships. Your code is responsible for the engines, weapons, radar, and communications of ships ranging from tiny missiles to massive cruisers.

Apologies if this doesn't qualify since it's not strictly a standalone crate, but it's pretty cool in any case.


I would like to self-nominate webpage-rs, a small library to fetch info about a web page: title, description, language, HTTP info, links, RSS feeds, Opengraph,, and more.

It is used in e.g. Lemmy to display an image and title text for submitted links.


For those trudging through overgrown XML forests, may tagu be your billhook!
I've appreciated how it helps me author XML programmatically in Rust.

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I nominate shared-bus which provides a clean, race-free way of using a single I²C bus with multiple drivers. This comes in extremely handy as soon as one adds the second device to one’s embedded project. :wink:

The backstory for the implementation is fascinating too for those who want to deep dive: How can we share a bus between multiple drivers? · Issue #35 · rust-embedded/embedded-hal · GitHub


I nominate Silkenweb, a library for building web apps with fine-grained reactivity and a clean separation of logic and UI.


Looks very nice. The demo did not load on my MacBook M1 though...

I'd like to nominate the Stalwart mail server, an all-in-one (SMTP + IMAP + JMAP) mail server, which is incredibly easy to set up (I came to it after failing to correctly set up Postfix), very easy to administrate, and full-featured.


I would like to nominate bore, "a simple CLI tool for making tunnels to localhost". It’s similar to ngrok for setting up ingress tunnels, but much much simpler and barebone. Just does one thing well.

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I'd toss in a self-nomination for modyne, a higher-level crate for building single-table data models on top of AWS DynamoDB, and is based on the concepts in Alex DeBrie's The DynamoDB Book. The code includes modyne implementations of all four data model examples provided in the book. One such example from chapter 21 is the Github data model.

Self suggestion: a super simple CLI to ask a yes or no questions for use in personal scripts: GitHub - SUPERCILEX/ask-cli: `ask` offers a simple way to ask a yes or no question on the CLI, returning exit code 0 on "yes" and 1 on "no".

I’d have to send a nomination for Axum_login which is an Authenticator and session manager for use with Axum.

It’s been really useful for me just to plug in and make it work, whilst giving me sufficient customisation options to make it work how I want it to. It’s also just hit 0.8 as of a few days ago.

It's been mentioned before by @H2CO3 but I just have to renominate Typst. A modern LATEX alternative written entirely in rust.

Or To quote @H2CO3

I've been working with it for my master thesis for about a month and so far it is a blast. It is like LATEX but written for a modern audience.

For reference: In 10 years of LATEX I have never learnt how to do any package programming and even simple things I couldn't do if there wasn't a package available. With Typst I made my first contribution on github this week.


I’d have to send a nomination of datetime crates fastdate

way fastdate?

  • full test, Code testing coverage >= 99%
  • Powerful, easy to use
  • based on crate time

this date cartes is very fast, many method option (<= 50ns) including

fastdate = "0.3"
use fastdate::DateTime;
fn main(){
    //now with local time zone
    //utc time now
    // add
    DateTime::now() + Duration::from_secs(1);
    // sub
    DateTime::now() - Duration::from_secs(1);
    //parse allow token = ["YYYY","MM","DD","hh","mm","ss",".000000","+00:00"]
    fastdate::DateTime::parse("YYYY-MM-DD hh:mm:ss.000000000Z", "2022-12-13 11:12:14.123456789Z").unwrap();
    fastdate::DateTime::parse("YYYY-MM-DD hh:mm:ss.000000000+00:00", "2022-12-13 11:12:14.123456789+06:00").unwrap();
    //format allow token = ["YYYY","MM","DD","hh","mm","ss",".000000","+00:00"]
     let dt = fastdate::DateTime::from((
        Date {
            day: 1,
            mon: 1,
            year: 2000,
        Time {
            nano: 1233,
            sec: 11,
            minute: 1,
            hour: 1,
    let str:String = dt.format("YYYY-MM-DD/hh/mm/ss");
    let date1 = DateTime::from_str("2022-12-12 00:00:00").unwrap();
    let date2 = DateTime::from_str("2022-12-12 01:00:00").unwrap();
    assert_eq!(date2.after(&date1), true);
    assert_eq!(date1.before(&date2), true);
    //from str
    let datetime=DateTime::from_str("1234-12-13 11:12:13.123456");
    //from str time zone
    let datetime=DateTime::from_str("1234-12-13 11:12:13.123456+08:00");
    let datetime=DateTime::from_str("1234-12-13 11:12:13.123456Z");
    let s = datetime.to_string();//1234-12-13 11:12:13.123456
    let timestamp = DateTime::now().unix_timestamp();
    //from unix_timestamp
    let datetime = DateTime::from_timestamp(timestamp);
    let timestamp = DateTime::now().unix_timestamp_millis();
    //from unix millis
    let datetime = DateTime::from_timestamp_millis(timestamp);
    let timestamp = DateTime::now().unix_timestamp_nano();
    //from unix_timestamp_nano
    let datetime = DateTime::from_timestamp_nano(timestamp);
    //sum Greenwich Mean Time (GMT) from datetime
    let time_gmt = DateTime::now().sub(Duration::from_secs(offset_sec() as u64));

I’ll do my part, since suggestions have been scarce:

In light of the release of Rocket 0.5 I thought that it must be worth a suggestion.

Rocket aims to be fast, easy, and flexible while offering guaranteed safety and security where it can. Importantly, Rocket also aims to be fun , and it accomplishes this by ensuring that you write as little code as needed to accomplish your task.


Shutdown management for graceful shutdown of tokio applications. Guard creating and usage is lock-free and the crate only locks when:

  • the shutdown signal was not yet given and you wait with a (weak or strong) guard on whether or not it was in fact cancelled;
  • the check of whether or not the app can shut down typically is locked until the shutdown signal was received and all (strong) guards were dropped.

It's the kind of thng that you can also do alone, but why would you want it, and if so, better make sure it's done correctly.

In order to avoid you having to figure out how to do it yourself correctly, it is much easier to use this crate instead.


As promised during RustLab in Florence, here is my crate proposal:

Symbols is an utility, not a standalone crate, that allows people quickly create proc-macros to solidify database tables into enums, e.g. allowing compile time foreign keys checks

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strum was CotW 2017-06-27 has some nice helpers.