ERDP is a very small Rust crate to help with error displaying. If you use std::fmt::Display to display a std::error::Error like the following code:
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:
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.
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