rust/clippy_dev/src/lib.rs

#![feature(once_cell)]
#![cfg_attr(feature = "deny-warnings", deny(warnings))]
// warn on lints, that are included in `rust-lang/rust`s bootstrap
#![warn(rust_2018_idioms, unused_lifetimes)]

use std::path::PathBuf;

pub mod bless;
pub mod fmt;
pub mod new_lint;
pub mod serve;
pub mod setup;
pub mod update_lints;

/// Returns the path to the Clippy project directory
///
/// # Panics
///
/// Panics if the current directory could not be retrieved, there was an error reading any of the
/// Cargo.toml files or ancestor directory is the clippy root directory
#[must_use]
pub fn clippy_project_root() -> PathBuf {
    let current_dir = std::env::current_dir().unwrap();
    for path in current_dir.ancestors() {
        let result = std::fs::read_to_string(path.join("Cargo.toml"));
        if let Err(err) = &result {
            if err.kind() == std::io::ErrorKind::NotFound {
                continue;
            }
        }

        let content = result.unwrap();
        if content.contains("[package]\nname = \"clippy\"") {
            return path.to_path_buf();
        }
    }
    panic!("error: Can't determine root of project. Please run inside a Clippy working dir.");
}