Easy-error

This crate is a lightweight error handling library meant to play well with the standard Error trait. There are three major components of this crate:

1. A basic, string-based error type that is meant for either quick prototyping or human-facing errors.
2. A nice way to iterate over the causes of an error.
3. Some macros that make returning errors slightly more ergonomic.

Rust Version Requirements

The current version requires Rustc 1.32 or newer. In general, this crate will be compilable with the Rustc version available on the oldest Ubuntu LTS release. Any change that requires a new Rustc version will be considered a breaking change and will be handled accordingly.

Example

use std::{fs::File, io::Read};
use easy_error::{Error, ResultExt};

fn run(file: &str) -> Result<i32, Error> {
    let mut file = File::open(file).context("Could not open file")?;

    let mut contents = String::new();
    file.read_to_string(&mut contents).context("Unable to read file")?;

    let value = contents.trim().parse().context("Could not parse file")?;
    ensure!(value != 0, "Value cannot be zero");

    Ok(value)
}

fn main() {
    let file = "example.txt";

    if let Err(e) = run(file) {
        eprintln!("Error: {}", e);
        e.iter_causes().for_each(|c| eprintln!("Caused by: {}", c));
    }
}