# Giftwrap [](https://crates.io/crates/giftwrap)
Wrap and unwrap your types the stylish way with derive macros for From/TryFrom in both directions
## How does it work?
`giftwrap` exposes two derive macros, `Wrap` and `Unwrap` that derive `impl From<inner_type> for your_type` and `impl From<your_type> for inner_type` (or `TryFrom<your_type>` in the case of enums) respectively.
It works for any struct or enum variant that holds only a single type, and don't worry variants with multiple types or with types you want to convert yourself can be easily ignored by setting `noWrap` and `noUnwrap` in the `#[giftwrap()]` attribute.
## Examples
Consider the following `error.rs`
```rust
pub type Result<T> = std::result::Result<T, Error>;
macro_rules! impl_from {
($wrapper:expr, $inner:ty) => {
impl From<$inner> for Error {
fn from(e: $inner) -> Error {
$wrapper(e)
}
}
};
}
#[derive(Debug)]
pub enum Error {
Io(std::io::Error),
RppalGpio(rppal::gpio::Error),
Reqwest(reqwest::Error),
Qr(Box<qrcodegen::DataTooLong>),
Other(String),
}
impl_from!(Error::Io, std::io::Error);
impl_from!(Error::RppalGpio, rppal::gpio::Error);
impl_from!(Error::Reqwest, reqwest::Error);
impl From<qrcodegen::DataTooLong> for Error {
fn from(f: qrcodegen::DataTooLong) -> Self {
Error::Qr(f.into())
}
}
impl From<Box<qrcodegen::DataTooLong>> for Error {
fn from(f: Box<qrcodegen::DataTooLong>) -> Self {
Error::Qr(f)
}
}
```
This might seem simple enough but adding new error types is not as easy as it could be.
However with `giftwrap` it's as simple as it gets:
```rust
pub type Result<T> = std::result::Result<T, Error>;
use giftwrap::Wrap;
#[derive(Debug, Wrap)]
pub enum Error {
Io(std::io::Error),
RppalGpio(rppal::gpio::Error),
Reqwest(reqwest::Error),
#[giftwrap(wrapDepth = 0)]
Qr(<qrcodegen::DataTooLong>),
#[giftwrap(noWrap = true)]
Other(String),
}
```
Now you could add a new error variant wrapping a type from any library and `giftwrap` handles the rest for you