rustilities 3.0.1

This crate offers a few utils for Rust development
Documentation 
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// SPDX-License-Identifier: GPL-3.0

#[cfg(test)]
mod tests;

use crate::Error;
use std::{path::Path, process::Command};

const EXPECT_MSG: &str = "If cargo fmt were to fail with an IO error, it would have already failed with 'cargo +nightly fmt --all'; qed;";

/// Given a path, this function firstly tries to:
/// - Apply `cargo +nightly fmt --all` to it.
/// - In case of failure, it tries to apply `cargo fmt --all` to it.
/// - Otherwise it returns an error explaining why the command failed.
/// ## Errors:
/// - If neither `cargo +nightly fmt --all` nor `cargo fmt --all` can be successfully applied to the
///   path.
pub fn format_dir<P: AsRef<Path>>(path: P) -> Result<(), Error> {
	fn do_format_dir(path: &Path) -> Result<(), Error> {
		Command::new("cargo")
			.arg("+nightly")
			.arg("fmt")
			.arg("--all")
			.current_dir(path)
			.output()
			.map(|output| {
				if output.status.success() {
					output
				} else {
					Command::new("cargo")
						.arg("fmt")
						.arg("--all")
						.current_dir(path)
						.output()
						.expect(EXPECT_MSG)
				}
			})
			.map_or_else(
				|err| Err(err.into()),
				|output| {
					if output.status.success() {
						Ok(())
					} else {
						Err(Error::Descriptive(
							String::from_utf8_lossy(&output.stderr).into_owned(),
						))
					}
				},
			)
	}
	do_format_dir(path.as_ref())
}