# ERDP
[](https://crates.io/crates/erdp)
ERDP is a small Rust crate with zero dependencies to help you display an error. If you use `std::fmt::Display` to display a `std::error::Error` like the following code:
```rust
use std::fs::File;
use std::path::{Path, PathBuf};
use thiserror::Error;
fn main() {
let path = PathBuf::from("config.json");
if let Err(e) = load_config(&path) {
eprintln!("Failed to load {}: {}.", path.display(), e);
}
}
fn load_config(path: &Path) -> Result<(), MyError> {
let file = match File::open(path) {
Ok(v) => v,
Err(e) => return Err(MyError::OpenFileFailed(e)),
};
Ok(())
}
#[derive(Debug, Error)]
enum MyError {
#[error("couldn't open the specified file")]
OpenFileFailed(#[source] std::io::Error),
}
```
What you get is just a message from a top-level error:
```
Failed to load config.json: couldn't open the specified file.
```
With this crate you can use `display` method on the error value like:
```rust
use erdp::ErrorDisplay;
eprintln!("Failed to load {}: {}.", path.display(), e.display());
```
Then the output will change to something like:
```
Failed to load config.json: couldn't open the specified file -> No such file or directory.
```
## Breaking changes in 0.2
- ERDP now depend on `alloc` crate.
- Rust minimum version now 1.85.
## License
MIT