Struct Convert

Auto Covnert between structs.

Example

A simple struct convert.

```rust use struct_convert::Convert;

[derive(Debug, Default, PartialEq)]

struct B { bid: String, num: String, name: String, }

[derive(Debug, Default, PartialEq)]

struct C { cid: Option, num: String, name: String, }

[derive(Debug, Default, Clone, Convert, PartialEq)]

[convert(into = "B")]

[convert(into = "C")]

struct A { #[convertfield(class = "B", rename = "bid", tostring)] #[convertfield(class = "C", rename = "cid", customfn = "wrap_id")] id: i64,

#[convert_field(to_string)]
num: i64,

#[convert_field(unwrap)]
name: Option<String>,

}

fn wrapid(a: &A) -> Option { Some(a.id.tostring()) }

fn main() { let a = A { id: 2, num: 1, name: Some("Jack".tostring()), }; let b: B = a.clone().into(); debugasserteq!( B { num: "1".tostring(), bid: 2.tostring(), name: "Jack".tostring(), }, b );

let c: C = a.into();
debug_assert_eq!(
    C {
        num: "1".to_string(),
        cid: Some("2".into()),
        name: "Jack".to_string(),
    },
    c
);

}

```

Inner stuct convert.

```rust use struct_convert::Convert;

[derive(Debug, Default, PartialEq)]

struct BInner { name: String, }

[derive(Debug, Default, PartialEq)]

struct B { bid: i64, inner: BInner, }

[derive(Debug, Default, Convert, PartialEq)]

[convert(into = "B")]

struct A { #[convert_field(rename = "bid")] id: i64,

inner: AInner,

}

[derive(Debug, Default, Convert, PartialEq)]

[convert(into = "BInner")]

struct AInner { name: String, }

fn main() { let a = A { id: 2, inner: AInner { name: String::from("AInner"), }, }; let b: B = a.into(); debugasserteq!( B { bid: 2, inner: BInner { name: String::from("AInner") }, }, b ); } ```

Option field convert.

```rust use struct_convert::Convert;

[derive(Debug, Default, PartialEq)]

struct BInner { name: String, }

[derive(Debug, Default, PartialEq)]

struct B { name: String, name2: String, optstr: Option, optstr2: Option, }

[derive(Debug, Default, Convert, PartialEq)]

[convert(into = "B")]

struct A { #[convert_field(unwrap)] name: Option,

#[convert_field(unwrap)]
name2: Option<String>,

#[convert_field(option)]
opt_str: String,

#[convert_field(option)]
opt_str2: Option<String>,

}

[derive(Debug, Default, Convert, PartialEq)]

[convert(into = "BInner")]

struct AInner { name: String, }

fn main() { let a = A { name: Some("Jack".tostring()), optstr: String::from("str"), optstr2: Some(String::from("Option")), name2: None, }; let b: B = a.into(); debugasserteq!( B { name: "Jack".tostring(), optstr: Some(String::from("str")), optstr2: Some(String::from("Option")), name2: "".to_string() }, b ); } ```

Ignore Some fileds.

```rust use struct_convert::Convert;

[derive(Debug, Default, PartialEq)]

struct B { num: String, name: String, }

[derive(Debug, Default, Convert, PartialEq)]

[convert(into = "B")]

struct A { #[convert_field(ignore)] id: i64,

#[convert_field(to_string)]
num: i64,

#[convert_field(unwrap)]
name: Option<String>,

}

fn main() { let a = A { id: 2, num: 1, name: Some("Jack".tostring()), }; let b: B = a.into(); debugasserteq!( B { num: "1".tostring(), name: "Jack".to_string(), }, b ); } ```

convert B from A ```rust use struct_convert::Convert;

[derive(Debug, Default, Convert, PartialEq)]

[convert(from = "AInner")]

struct BInner { name: String, }

[derive(Debug, Default, Convert, PartialEq)]

[convert(from = "A")]

struct B {

#[convert_field(rename = "id")]
bid: i64,

#[convert_field(to_string)]
num: String,

#[convert_field(unwrap)]
name: String,

inner: BInner,

#[convert_field(wrap)]
opt_str: Option<String>,

opt_str2: Option<String>

}

[derive(Debug, Default, PartialEq)]

struct A { ignoref: i64, id: i64, num: i64, name: Option, inner: AInner, optstr: String, opt_str2: Option, }

[derive(Debug, Default, PartialEq)]

struct AInner { name: String, }

fn main() { let a = A { id: 2, num: 1, name: Some("Jack".tostring()), inner: AInner { name: String::from("AInner"), }, optstr: String::from("str"), optstr2: Some(String::from("Option")), ignoref: 1, }; let b: B = a.into(); debugasserteq!( B { num: "1".tostring(), bid: 2, name: "Jack".tostring(), inner: BInner { name: String::from("AInner") }, optstr: Some(String::from("str")), optstr2: Some(String::from("Option")) }, b ); } ```

Convert with custom function.

```rust use struct_convert::Convert;

[derive(Debug, Default, PartialEq)]

struct B { bid: i64, }

[derive(Debug, Default, Convert, PartialEq)]

[convert(into = "B")]

struct A { #[convertfield(rename = "bid", customfn = "strtoi64")] id_str: String, }

[derive(Debug, Default, Convert, PartialEq)]

[convert(from = "B")]

struct C { #[convertfield(rename = "bid", customfn = "to_point")] point: Point, }

[derive(Debug, Default, PartialEq)]

struct Point(i64, i64);

fn strtoi64(a: &A) -> i64 { a.id_str.parse().unwrap() }

fn to_point(b: &B) -> Point { Point(b.bid, b.bid) }

fn main() { let a = A { idstr: "4".into() }; let b: B = a.into(); debugasserteq!(B { bid: 4 }, b); let c: C = b.into(); debugassert_eq!(C { point: Point(4, 4) }, c);

}

```

More examples look here.

Welcome PR.