errer_derive 0.13.1

extern crate errer;
#[macro_use] extern crate errer_derive;

use errer::{res, main_res, IntoErrorContext, ErrorContext};

use std::fmt;
use std::io;

#[derive(Debug, Eq, PartialEq)]
struct Dog;

impl fmt::Display for Dog {
	fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
		write!(fmt, "bark")
	}
}

trait Item: fmt::Display {}

#[derive(Debug, Eq, PartialEq)]
struct StringItem;

impl fmt::Display for StringItem {
	fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
		write!(fmt, "string")
	}
}

impl Item for StringItem {}

#[derive(Debug, Eq, PartialEq, Errer)]
#[errer(from, display = "aaaaaaaaaaaaaaaaaahuehueh {} heheh")]
enum Heck<X: Item> {
	#[errer(display = "Heckin error: is cat")]
	Cat,
	#[errer(display = "Heckin error: is cat with a {}", 0)]
	CatWithDog(Dog),
	#[errer(display = "Heckin heck")]
	CatWithDogAndBool(Dog, bool),
	#[errer(display = "Heckin error: is cat with \"{}\"", x)]
	CatWithItem {x: X}
}

#[derive(Debug, Eq, PartialEq, Errer)]
#[errer(display = "{} hab ben hekked by {}!", 0, 1)]
struct Hecked<'a, H: fmt::Display>(Dog, &'a H);

#[derive(Debug, Eq, PartialEq, Errer)]
#[errer(from, context)]
enum CtxTest {
	#[errer(display = "AAAAAAAAAAAAAAAA")]
	NumWrong (bool, u32),
	#[errer(context=NumWrongTwo)]
	NumWrong2 (bool)
}

#[derive(Debug, Eq, PartialEq, Errer)]
#[errer(context=TestStructCtx)]
struct CtxTestStruct (#[errer(from)] bool, u32);

#[derive(Debug, Errer)]
struct StdTest (#[errer(std, from)] io::Error);

#[derive(Debug, Errer)]
enum StdEnumTest {
	#[errer(std, from)]
	X (io::Error),
	#[errer(std, from)]
	Y {from: std::ffi::NulError}
}

#[test]
fn enum_display() {
	let hecks = vec![Heck::Cat, Heck::CatWithDog(Dog), Heck::CatWithDogAndBool(Dog, false), Heck::CatWithItem {x: StringItem}];

	for x in hecks {
		println!("{}", x);
	}

	println!("{}", CtxTest::NumWrong (false, 0));
}

#[test]
fn from_tests() {
	assert_eq!(Heck::<StringItem>::CatWithDog(Dog), Dog.into());
}

#[test]
fn struct_display() {
	println!("{}", Hecked::<Heck<StringItem>>(Dog, &Heck::Cat));
}

fn err<E>(e: E) -> Result<(), E> {
	Err(e)
}

#[test]
fn context() {
	assert_eq!(CtxTest::NumWrong (true, 5), NumWrong (5).into_target(true));
	assert_eq!(err(CtxTest::NumWrong (true, 5)), err(true).context(NumWrong(5)));
	assert_eq!(err(CtxTest::NumWrong2 (true)), err(true).context_with(|| NumWrongTwo));
	
	assert_eq!(err(CtxTestStruct (true, 5)), err(true).context(TestStructCtx(5)));
}

mod macro_test {
	use super::*;

	res!(Dog);

	fn main_res() -> Res<()> {
		Err(Dog)
	}

	main_res!(main_res);

	#[test]
	fn main_test() { assert_eq!((), main()) }
}

mod macro_test3 {
	use super::*;

	res!(Hecked<'a, H>);

	fn main_res<'a>() -> Res<'a, Heck<StringItem>, ()> {
		Err(Hecked(Dog, &Heck::Cat))
	}

	main_res!(main_res);
	
	#[test]
	fn main_test() { assert_eq!((), main()) }
}