SNAFU
Situation Normal: All Fouled Up
SNAFU is a library to easily assign underlying errors into
domain-specific errors while adding context.
use snafu::{ResultExt, Snafu};
use std::{fs, io, path::PathBuf};
#[derive(Debug, Snafu)]
enum Error {
#[snafu(display("Unable to read configuration from {}: {}", path.display(), source))]
ReadConfiguration { source: io::Error, path: PathBuf },
#[snafu(display("Unable to write result to {}: {}", path.display(), source))]
WriteResult { source: io::Error, path: PathBuf },
}
type Result<T, E = Error> = std::result::Result<T, E>;
fn process_data() -> Result<()> {
let path = "config.toml";
let configuration = fs::read_to_string(path).context(ReadConfiguration { path })?;
let path = unpack_config(&configuration);
fs::write(&path, b"My complex calculation").context(WriteResult { path })?;
Ok(())
}
fn unpack_config(data: &str) -> &str {
"/some/path/that/does/not/exist"
}
Please see the documentation and the user's guide for
a full description.