cargo-unused-deps

main.rs

use cargo_metadata::{CargoOpt, DependencyKind, MetadataCommand};
use std::process::Command;

fn main() {
    let mut packages = MetadataCommand::new()
        .manifest_path("./Cargo.toml")
        .features(CargoOpt::AllFeatures)
        .exec()
        .unwrap()
        .packages;

    packages.sort_by_key(|p| p.source.is_some());

    for package in packages {
        let src_paths = package
            .targets
            .iter()
            .filter(|t| t.src_path.exists())
            .map(|t| t.src_path.with_file_name("").into_os_string())
            .collect::<Vec<_>>();

        let is_dep = package.source.is_some();

        for dep in package
            .dependencies
            .into_iter()
            .filter(|d| !is_dep || d.kind != DependencyKind::Development)
            .map(|d| d.rename.unwrap_or(d.name))
        {
            let found = Command::new("rg")
                .args(&["--type", "rust"])
                .arg("-qw")
                .arg(dep.replace("-", "_"))
                .args(&src_paths)
                .status()
                .unwrap()
                .success();

            if !found {
                println!(
                    "{} ({}): {} not found",
                    package.name,
                    package.manifest_path.display(),
                    dep
                );
            }
        }
    }
}