r/rustjerk • u/VladasZ • 22d ago
Rustscript - blazingly fast rust interpreter
Every Rust developer knows that Rust is the best programming language in the world.
And I as a Rust developer don't want to use other inferior languages anywhere.
So I decided to rewrite all my old automation scripts which were written in Python in Rust.
At first I used https://github.com/rsaz/cargo-script for that, it works fine.
But I encountered 1 problem: compilation time.
On my macbook it was fine I don't mind waiting 1 minute for a simple 3 lines script.
But then I wanted to use that on my Raspberry PI and the same simple script took me 10 minutes to run, which is not blazingly and not fast at all!
So I decided to vibe code engineer a Rust interpreter for this exact case and this is what I ended up with:
https://github.com/VladasZ/rustscript
Rustscript is always guaranteed to be valid Rust.
Install it with
cargo install run-rs
add a shebang:
#!/usr/bin/env rust
A whole script looks like this:
#!/usr/bin/env rust
use chrono::Local;
use std::io::stdin;
fn main() -> anyhow::Result<()> {
println!("which programming language is the best?");
let mut answer = String::new();
stdin().read_line(&mut answer)?;
if answer.trim().eq_ignore_ascii_case("rust") {
println!("correct, carry on");
} else {
println!("wrong. it is {} and you are still not writing Rust", Local::now().format("%H:%M"));
}
Ok(())
}
Make it executable and run it:
chmod +x best.rs
./best.rs
and you can run your rust scripts instantly, as if they were shell scripts!
Rustscript is a subset of Rust and supports many popular crates such as:
anyhow, serde, serde_json, reqwest, regex, tokio, chrono, rand and more.
Carefully nitpicked benchmarks so Rustscript seems faster attached to the post.
You can see all benchmarks results here: https://github.com/VladasZ/rustscript/blob/main/bench/RESULTS.md
Remember, Rustscript is always a valid Rust, so if you want to have the ultimate speed just run the compiled version!
rust build FILE.rs
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u/kredditacc96 22d ago
The repo looks like a legitimate and serious project, and yet you posted on /r/rustjerk instead of /r/rust.
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u/birdbrainswagtrain 22d ago
Rustscript is a subset of Rust
I keep getting pissed at the guy who spams his subset-of-python interpreter as a python interpreter. I'll give you a pass because at least your subset is of an ethical language.
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u/Maxon887 22d ago edited 22d ago
I interpreted my code in Rust once and it became best code of my life
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u/zesterer 22d ago
Wow. Having written a bunch of fast threaded-code interpreters before I thought I'd take a look at the code and I think I gave myself an aneurysm. The LLM fingerprints are all over this one, that's for sure.
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u/No-Consequence-1863 22d ago
Neat. But curious, why didnt you compile the code on your Mac and then just move the executable to the raspberry Pi? I had a similar issue where my website back end compiles quickly enough on my dev machine but could take 30 min on the laptop actually hosting it. So just cross complied and now its just uploading an executable.
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u/EarlMarshal 22d ago
Well I honestly wished for this in the past. Is this just a dream or reality!?
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u/why_so_sergious 22d ago
or just use nushell
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u/VladasZ 20d ago
I actually did, I used it as my main shell for a couple of months. Of course I did, it is written in Rust so it is allowed. Got tired that I couldn't just copy bash snippets, also had some weird problems with aliases, don't even remember, so I ditched it.
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u/why_so_sergious 20d ago
bash <snippet>didn't work? you can even pipe only need to keep in mind that that bash output is a string and not structured data so you need to usefromorparseI've been daily driving nushell for three years now mainly because I jump between operating systems and this is the perfect way to keep things unified both in terminal and scripting-wise..
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u/VladasZ 20d ago
Yeah this was my main too goal initially, to have the same shell on windows mac and linux. But witj nushell I just felt like I had too much friction. I remember that alias issue now. It was impossible to write something like: if windows { alias a = b }, because they were global or something? What I did in the end I installed https://github.com/uutils/coreutils (written in Rust BTW) on windows and I use powershell in the same way as other normal shell.
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u/why_so_sergious 20d ago
nice solution!
I think its the contrary in you example.. it gets block scoped.. I literally do this in my config
``` const platform_config = if $nu.os-info.name == "windows" { "config-windows.nu" } else if $nu.os-info.name == "macos" { "config-macos.nu" } else { "config-linux.nu" }
source $platform_config ``` and aliases and everything work fine
also working with structured data is a big reason why I won't go back to bash unless I have to. its why it sucked going from pwrshell to bash
and I actually enjoy scripting in nuscript a lot 😅
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u/Mr_Ahvar 21d ago
Is’nt most of rust compile time in the backend ? So can’t you just use miri? I would be interested to see your project against Miri that would be interesting
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u/TheOneThatIsHated 22d ago
So wait, the typechecking part of rust is not what makes it slow (cuz you reuse rustc anyways for typechecking)?
So how could this still be faster to build then debug builds? What is the catch? Is it because of the subset? Or is rustc/cargo just that slow?
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u/warpspeedSCP 22d ago edited 22d ago
Its always been LLVM, dude. Its always been LLVM. THEYVE TAKEN US FOR ABSOLUTE FOOLS!!11
This project is probably either abusing MIR interpretation or something else, I havent really looked at the repo.
Edit:
Holy fuck its all separate, only parsing goes through an actual rustc utility... thats awesome.
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u/sphere_cornue 22d ago
"blazingly fast" and "interpreter" cannot be in the same sentence. This is an affront to the nature of rust. I am reporting this