use std::hash::{Hash, Hasher, SipHasher};

#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum SourceKind {
    Git(GitReference),
    Path,
    Registry,
    LocalRegistry,
    Directory,
}

#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum GitReference {
    Tag(String),
    Branch(String),
    Rev(String),
    DefaultBranch,
}

pub fn hash_pair(r: SourceKind, a: &str) -> u64 {
    let mut hasher = SipHasher::new();
    r.hash(&mut hasher);
    a.hash(&mut hasher);
    hasher.finish()
}

fn main() {
	assert_eq!(
		hash_pair(SourceKind::Registry, "https://github.com/rust-lang/crates.io-index"),
		//0x1ecc6299db9ec823
		//0x 1e cc 62 99 db 9e c8 23
		0x23c89edb9962cc1e // little-endian
	);
}