dcr 0.8.4

DCR is a utility for managing C/C++ projects in a Cargo-like style.
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use std::path::{Path, PathBuf};
use std::process::Command;
use std::sync::Once;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::time::{SystemTime, UNIX_EPOCH};

static COUNTER: AtomicUsize = AtomicUsize::new(0);
static BUILD_ONCE: Once = Once::new();

fn bin_path() -> PathBuf {
    if let Ok(exe) = std::env::var("CARGO_BIN_EXE_dcr") {
        return PathBuf::from(exe);
    }
    ensure_bin_built();
    let mut path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
    path.push("target");
    path.push("debug");
    path.push(format!("dcr{}", std::env::consts::EXE_SUFFIX));
    path
}

fn unique_sandbox_dir(prefix: &str) -> PathBuf {
    let pid = std::process::id();
    let n = COUNTER.fetch_add(1, Ordering::SeqCst);
    let now = SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .unwrap_or_default()
        .as_nanos();
    let mut path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
    path.push("sandbox");
    path.push("cli-tests");
    path.push(format!("dcr_{prefix}_{pid}_{n}_{now}"));
    std::fs::create_dir_all(&path).expect("failed to create temp dir");
    path
}

fn run_dcr_env(args: &[&str], cwd: &Path, envs: &[(&str, &str)]) -> std::process::Output {
    let mut cmd = Command::new(bin_path());
    cmd.args(args).current_dir(cwd);
    for (k, v) in envs {
        cmd.env(k, v);
    }
    cmd.output().expect("failed to run dcr")
}

fn ensure_bin_built() {
    BUILD_ONCE.call_once(|| {
        let status = Command::new("cargo")
            .arg("build")
            .current_dir(env!("CARGO_MANIFEST_DIR"))
            .status()
            .expect("failed to run cargo build");
        assert!(status.success(), "cargo build failed");
    });
}

#[test]
fn lint_command_runs() {
    let dir = unique_sandbox_dir("lint");
    let out = run_dcr_env(&["init"], &dir, &[]);
    assert!(out.status.success(), "dcr init should succeed");

    // Linting a clean project should succeed or at least run without crashing
    let tidy_ok = Command::new("clang-tidy")
        .arg("--version")
        .output()
        .map(|o| o.status.success())
        .unwrap_or(false);
    if !tidy_ok {
        eprintln!("clang-tidy not found; skipping lint test");
        return;
    }
    let out = run_dcr_env(&["lint"], &dir, &[]);
    assert!(
        out.status.success(),
        "dcr lint should run on clean project:\nstdout: {}\nstderr: {}",
        String::from_utf8_lossy(&out.stdout),
        String::from_utf8_lossy(&out.stderr)
    );
}