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miette 0.6.0

Fancy diagnostic reporting library and protocol for us mere mortals who aren't compiler hackers.
Documentation 
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use miette::{Diagnostic, Severity};
use thiserror::Error;

#[test]
fn basic_struct() {
    #[derive(Debug, Diagnostic, Error)]
    #[error("welp")]
    #[diagnostic(
        code = "foo::bar::baz",
        severity = "Error",
        help = "try doing it better"
    )]
    struct Foo;

    assert_eq!("foo::bar::baz".to_string(), Foo.code().to_string());

    assert_eq!(Some(Severity::Error), Foo.severity());

    assert_eq!(
        "try doing it better".to_string(),
        Foo.help().unwrap().to_string()
    );
}

#[test]
fn basic_enum() {

    #[derive(Debug, Diagnostic, Error)]
    #[error("welp")]
    enum Foo {
        #[diagnostic(
            code = "foo::x",
            severity = "Warning",
            help = "Try using Foo::Y instead"
        )]
        X,
        #[diagnostic(code = "foo::y")]
        Y,
    }

    assert_eq!("foo::x".to_string(), Foo::X.code().to_string());
    assert_eq!("foo::y".to_string(), Foo::Y.code().to_string());

    assert_eq!(Some(Severity::Warning), Foo::X.severity());
    assert_eq!(None, Foo::Y.severity());
}

#[test]
fn path_code() {
    #[derive(Debug, Diagnostic, Error)]
    #[error("welp")]
    #[diagnostic(code(foo::bar::baz))]
    struct FooStruct;

    assert_eq!("foo::bar::baz".to_string(), FooStruct.code().to_string());

    #[derive(Debug, Diagnostic, Error)]
    #[error("welp")]
    enum FooEnum {
        #[diagnostic(code(foo::x))]
        X,
    }

    assert_eq!("foo::x".to_string(), FooEnum::X.code().to_string());
}

#[test]
fn path_severity() {
    #[derive(Debug, Diagnostic, Error)]
    #[error("welp")]
    #[diagnostic(
        code(foo::bar::baz),
        severity(Warning)
    )]
    struct FooStruct;

    assert_eq!(Some(Severity::Warning), FooStruct.severity());

    #[derive(Debug, Diagnostic, Error)]
    #[error("welp")]
    enum FooEnum {
        #[diagnostic(
            code(foo::x),
            severity(Warning),
        )]
        X,
    }

    assert_eq!(Some(Severity::Warning), FooEnum::X.severity());
}

#[test]
fn list_help() {
    #[derive(Debug, Diagnostic, Error)]
    #[error("welp")]
    #[diagnostic(
        code(foo::bar::baz),
        help("try doing it better"),
    )]
    struct FooStruct;

    assert_eq!(
        "try doing it better".to_string(),
        FooStruct.help().unwrap().to_string()
    );

    #[derive(Debug, Diagnostic, Error)]
    #[error("welp")]
    enum FooEnum {
        #[diagnostic(
            code(foo::x),
            help("try doing it better"),
        )]
        X,
    }

    assert_eq!(
        "try doing it better".to_string(),
        FooEnum::X.help().unwrap().to_string()
    );
}

// TODO: Darling doesn't support this, apparently:
// https://github.com/TedDriggs/darling/issues/145
/*
#[test]
fn fmt_help() {
    #[derive(Debug, Diagnostic, Error)]
    #[error("welp")]
    #[diagnostic(
        code(foo::bar::baz),
        help("{} {}", 1, "bar"),
    )]
    struct FooStruct;

    assert_eq!(
        "1 bar".to_string(),
        FooStruct.help().unwrap().to_string()
    );

    #[derive(Debug, Diagnostic, Error)]
    #[error("welp")]
    enum FooEnum {
        #[diagnostic(
            code(foo::x),
            help("{} {}", 1, "bar"),
        )]
        X,
    }

    assert_eq!(
        "1 bar".to_string(),
        FooEnum::X.help().unwrap().to_string()
    );
}
*/