woah

woah is a Rust crate providing a "ternary Result" type that differentiates between "local errors" which can be handled, and "fatal errors" which can't.

Example

use std::ops::Try as _;

fn main() -> Result<(), FatalError> {
    let data = get_data_from_api()?;
    println!("Data: {}", data),
    Ok(())
}

fn get_data_from_api() -> Result<String, FatalError> {
    // If the error is fatal, return early!
    let result = request_url("https://some_website.whatever/api/get_data")?;

    match result {
    	// If the error is recoverable, handle it.
    	Err(RecoverableError::Redirected { new_url }) => request_url(new_url),
    	Ok(num) => Ok(num),
    }
}

fn request_url(url: &str) -> woah::Result<String, RecoverableError, FatalError> {
    // ...
}

enum RecoverableError {
    Redirected { new_url: String },
}

#[derive(Debug)]
enum FatalError {
    CouldntConnect,
}