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