Rust crate for Ok-wrapping and try blocks

Last update: Jan 25, 2023

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

Programming language that compiles into Scratch blocks (SB3).

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Comments

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