geez 0.1.0

geez — Global Error Embedding Zero-cost. Declarative error enums, thiserror-like attrs, zero deps
Documentation 
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use geez::geez;
use std::error::Error;

#[derive(Debug)]
struct Inner(String);

impl std::fmt::Display for Inner {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "inner({})", self.0)
    }
}

impl Error for Inner {}

geez! {
    enum Chain {
        #[from]
        A(Inner),

        #[error("context: {0}")]
        Context(String),
    }
}

#[test]
fn display_default_single_field() {
    geez! {
        enum E {
            Msg(String),
        }
    }
    assert_eq!(E::Msg("hi".into()).to_string(), "hi");
}

#[test]
fn question_mark_through_from() {
    fn fail() -> Result<()> {
        Err(Inner("boom".into()))?;
        Ok(())
    }
    let err = fail().unwrap_err();
    assert_eq!(err.to_string(), "inner(boom)");
    assert_eq!(err.source().unwrap().to_string(), "inner(boom)");
}

#[test]
fn eight_fields() {
    geez! {
        enum Wide {
            #[error("{0}-{1}-{2}-{3}-{4}-{5}-{6}-{7}")]
            All(u8, u8, u8, u8, u8, u8, u8, u8),
        }
    }
    assert_eq!(
        Wide::All(1, 2, 3, 4, 5, 6, 7, 8).to_string(),
        "1-2-3-4-5-6-7-8"
    );
}