Rust crate for Ok-wrapping and try blocks

Related tags

Command-line tryvial
Overview

tryvial

A small crate for Ok-wrapping and try blocks. This is compatible with Result, Option, and any type implementing the unstable std::ops::Try trait.

This crate does not require nightly Rust.

Overview

The macro try_fn is used to perform Ok-wrapping on the return value of a function.

Before:

fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("Enter your name: ");
    let mut name = String::new();
    std::io::stdin().read_line(&mut name)?;
    println!("Hello, {name}!");
    Ok(()) // this is ugly
}

After:

#[try_fn]
fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("Enter your name: ");
    let mut name = String::new();
    std::io::stdin().read_line(&mut name)?;
    println!("Hello, {name}!");
}

The macro try_block is an implementation of "try blocks" from nightly rust.

let result: Result<T, E> = try_block! {
   let a = do_one(x)?;
   let b = do_two(a)?;
   b
};

The macro wrap_ok simply wraps an expression with the "ok" variant for a given Try type.

assert_eq!(Some(42), wrap_ok!(42));

License

MIT or Apache-2.0

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Comments
  • Port from `syn` -> `venial`

    Port from `syn` -> `venial`

    The use of syn is quite overkill for such a trivial crate. The proc macro has been changed to use venial, which compiles much faster. This is faster even when used in a project that already uses syn, as the two crates can compile in parallel.

    opened by JoJoJet 0
Owner
Computer science undergrad student. Hobbyist game developer. Open-source enthusiast. Never shuts up about climate change.
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