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pub mod ancestors {
use crate::pack;
use git_hash::ObjectId;
use git_object::immutable;
use std::{
borrow::Borrow,
collections::{BTreeSet, VecDeque},
};
#[derive(Debug, thiserror::Error)]
#[allow(missing_docs)]
pub enum Error<LocateErr>
where
LocateErr: std::error::Error + 'static,
{
#[error(transparent)]
Locate(LocateErr),
#[error(transparent)]
ObjectDecode(#[from] immutable::object::decode::Error),
#[error("Object id {oid} wasn't found in object database")]
NotFound { oid: ObjectId },
}
pub struct Ancestors<'a, Cache, Locate> {
db: Locate,
next: VecDeque<ObjectId>,
buf: Vec<u8>,
seen: BTreeSet<ObjectId>,
cache: &'a mut Cache,
}
impl<'a, Cache, Locate> Ancestors<'a, Cache, Locate>
where
Cache: pack::cache::DecodeEntry,
Locate: crate::Locate,
{
pub fn new(db: Locate, tips: impl IntoIterator<Item = impl Into<ObjectId>>, cache: &'a mut Cache) -> Self {
let next: VecDeque<_> = tips.into_iter().map(Into::into).collect();
let seen = next.iter().cloned().collect();
Ancestors {
db,
next,
buf: Vec::with_capacity(4096),
seen,
cache,
}
}
}
impl<'a, Cache, Locate> Iterator for Ancestors<'a, Cache, Locate>
where
Cache: pack::cache::DecodeEntry,
Locate: crate::Locate,
{
type Item = Result<ObjectId, Error<Locate::Error>>;
fn next(&mut self) -> Option<Self::Item> {
let res = self.next.pop_front();
if let Some(oid) = res {
match self.db.borrow().locate(oid, &mut self.buf, self.cache) {
Ok(Some(obj)) => {
if let Some(mut iter) = obj.into_commit_iter() {
if let Some(Err(decode_tree_err)) = iter.next() {
return Some(Err(decode_tree_err.into()));
}
for token in iter {
match token {
Ok(immutable::commit::iter::Token::Parent { id }) => {
let was_inserted = self.seen.insert(id);
if was_inserted {
self.next.push_back(id);
}
}
Ok(_a_token_past_the_parents) => break,
Err(err) => return Some(Err(err.into())),
}
}
}
}
Ok(None) => return Some(Err(Error::NotFound { oid })),
Err(err) => return Some(Err(Error::Locate(err))),
}
}
res.map(Ok)
}
}
}
#[doc(inline)]
pub use ancestors::Ancestors;