akin 0.2.0

A crate for writing repetitive code easier and faster.
Documentation 
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#[cfg(test)]
use akin::akin;

#[test]
fn basic() {
    let mut res = 0;
    akin! {
        let &var = [1, 2, 3, 4, 5];
        res += *var;
    }
    assert_eq!(res, 15)
}

#[test]
fn list() {
    let mut res = String::new();
    akin! {
        let &var = [ ['a', 'b'], ['c', 'd'], ['e'] ];
        res.extend(*var);
    }
    assert_eq!(res, "abcde")
}

#[test]
fn _match() {
    let test = |val| {
        akin! {
            let &var = ["a", "b", "c", "d"];
            let &branch = {
                *var => *var.to_owned(),
            };
            match val {
                *branch
                _ => String::new()
            }
        }
    };

    assert_eq!(test("a"), "a".to_owned());
    assert_eq!(test("b"), "b".to_owned());
    assert_eq!(test("c"), "c".to_owned());
    assert_eq!(test("d"), "d".to_owned());
}

#[test]
fn multiple_same_len() {
    use std::fmt::Write;
    
    let mut res = String::new();
    akin! {
        let &a = [1, 2, 3];
        let &b = [3, 2, 1];
        writeln!(&mut res, "*a + *b = {}", *a + *b).unwrap();
    }
    
    assert_eq!(res, "1 + 3 = 4\n2 + 2 = 4\n3 + 1 = 4\n")
}

#[test]
fn multiple_diff_len() {
    use std::fmt::Write;
    let mut res = String::new();
    akin! {
        let &a = [1, 2, 3, 4];
        let &b = [3, 2];
        writeln!(&mut res, "*a + *b = {}", *a + *b).unwrap();
    }
    
    assert_eq!(res, "1 + 3 = 4\n2 + 2 = 4\n3 + 2 = 5\n4 + 2 = 6\n")
}

#[test]
fn multiple_diff_len2() {
    use std::fmt::Write;
    let mut res = String::new();
    akin! {
        let &v1 = [c];
        let &v2 = [a, b];
        writeln!(&mut res, "*v1*v2").unwrap();
    }
    assert_eq!(res, "ca\ncb\n")
}

#[test]
fn _trait() {
    trait ToBytes {
        fn to_bytes(self) -> Vec<u8>;
    }
    
    akin! {
        let &int_type = [u8, u16, u32, u64];
        impl ToBytes for *int_type {
            fn to_bytes(self) -> Vec<u8> {
                self.to_le_bytes().into()
            }
        }
    }
    
    assert_eq!(vec![128], 128u8.to_bytes());
    assert_eq!(vec![1, 2], 513u16.to_bytes());
    assert_eq!(vec![160, 134, 1, 0], 100_000u32.to_bytes());
    assert_eq!(vec![0, 232, 118, 72, 23, 0, 0, 0], 100_000_000_000u64.to_bytes());
}

#[test]
fn fn_raw() {
    akin! {
        let &name = [1, 2, 3, 4, 5];
        fn _~*name() -> u32 {
            *name
        }
    }

    assert_eq!(_1(), 1);
    assert_eq!(_2(), 2);
    assert_eq!(_3(), 3);
    assert_eq!(_4(), 4);
    assert_eq!(_5(), 5);
}

#[test]
fn readme_example() {
    trait Sqrt {
        fn dumb_sqrt(self) -> Result<f64, &'static str>;
    }
    
    akin! {
        let &int_type = [i64, u64];
        let &negative_check = [
            {
                if self < 0 {
                    return Err("Sqrt of negative number")
                }
            }, 
            NONE
        ];
        
        let &num = [1,     2,    3,  4];
        let &res = [1., 1.41, 1.73,  2.];
        let &branch = {
            *num => Ok(*res),
        };
        
        impl Sqrt for *int_type {
            fn dumb_sqrt(self) -> Result<f64, &'static str> {
                *negative_check
                
                match self {
                    *branch
                    _ => Err("Sqrt of num not in [1, 4]")
                }
            }
        }
    }

    assert_eq!(10i64.dumb_sqrt(), Err("Sqrt of num not in [1, 4]"));
    assert_eq!(15u64.dumb_sqrt(), Err("Sqrt of num not in [1, 4]"));
    assert_eq!(2u64.dumb_sqrt(), Ok(1.41));
    assert_eq!(3i64.dumb_sqrt(), Ok(1.73));
    assert_eq!((-5i64).dumb_sqrt(), Err("Sqrt of negative number"));
}