weavatrix-git 0.3.1

use std::{
    fs,
    path::{Path, PathBuf},
    process::Command,
    sync::atomic::{AtomicU64, Ordering},
    time::{SystemTime, UNIX_EPOCH},
};

use weavatrix_git::{EntryKind, Repository};

static SEQUENCE: AtomicU64 = AtomicU64::new(0);

#[test]
fn snapshot_is_sorted_and_reads_files_without_checkout() {
    let root = fixture();
    fs::create_dir_all(root.join("src")).unwrap();
    fs::write(root.join("z.txt"), "z").unwrap();
    fs::write(root.join("src").join("a.rs"), "fn main() {}").unwrap();
    git(&root, &["add", "-A"]);
    git(
        &root,
        &[
            "-c",
            "user.name=Test",
            "-c",
            "user.email=test@example.invalid",
            "commit",
            "-qm",
            "snapshot",
        ],
    );

    let repository = Repository::open(&root).unwrap();
    let snapshot = repository.snapshot("HEAD").unwrap();
    let paths = snapshot
        .entries
        .iter()
        .map(|entry| entry.path.as_slice())
        .collect::<Vec<_>>();
    assert_eq!(paths, [b"src/a.rs".as_slice(), b"z.txt".as_slice()]);
    assert!(
        snapshot
            .entries
            .iter()
            .all(|entry| entry.kind == EntryKind::Blob)
    );
    for entry in snapshot.entries {
        assert!(!repository.object(entry.id).unwrap().data.is_empty());
    }
    fs::remove_dir_all(root).ok();
}

fn fixture() -> PathBuf {
    let unique = SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .unwrap()
        .as_nanos();
    let root = std::env::temp_dir().join(format!(
        "weavatrix-snapshot-{}-{unique}-{}",
        std::process::id(),
        SEQUENCE.fetch_add(1, Ordering::Relaxed)
    ));
    fs::create_dir_all(&root).unwrap();
    git(&root, &["init", "-q"]);
    root
}

fn git(path: &Path, args: &[&str]) {
    let output = Command::new("git")
        .args(args)
        .current_dir(path)
        .output()
        .unwrap();
    assert!(
        output.status.success(),
        "{}",
        String::from_utf8_lossy(&output.stderr)
    );
}