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#![allow(missing_docs)]
use git_hash::ObjectId;
use git_ref::FullNameRef;
use crate::{easy, easy::Head, ext::ReferenceExt};
pub enum Kind {
Symbolic(git_ref::Reference),
Unborn(git_ref::FullName),
Detached {
target: ObjectId,
peeled: Option<ObjectId>,
},
}
impl Kind {
pub fn attach<A>(self, access: &A) -> Head<'_, A> {
Head { kind: self, access }
}
}
impl<'repo, A> Head<'repo, A> {
pub fn name(&self) -> Option<FullNameRef<'_>> {
Some(match &self.kind {
Kind::Symbolic(r) => r.name.to_ref(),
Kind::Unborn(name) => name.to_ref(),
Kind::Detached { .. } => return None,
})
}
pub fn is_detached(&self) -> bool {
matches!(self.kind, Kind::Detached { .. })
}
}
impl<'repo, A> Head<'repo, A>
where
A: easy::Access + Sized,
{
pub fn into_referent(self) -> easy::Reference<'repo, A> {
match self.kind {
Kind::Symbolic(r) => r.attach(self.access),
_ => panic!("BUG: Expected head to be a born symbolic reference"),
}
}
}
pub mod log {
use std::marker::PhantomData;
use crate::{
easy,
easy::{ext::ReferenceAccessExt, Head},
};
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error(transparent)]
BorrowState(#[from] easy::borrow::state::Error),
#[error(transparent)]
FindExistingReference(#[from] easy::reference::find::existing::Error),
}
impl<'repo, A> Head<'repo, A>
where
A: easy::Access + Sized,
{
pub fn log(&self) -> Result<easy::reference::log::State<'repo, A, easy::Reference<'repo, A>>, Error> {
Ok(easy::reference::log::State {
reference: self.access.find_reference("HEAD")?,
buf: self.access.state().try_borrow_mut_buf()?,
_phantom: PhantomData::default(),
})
}
}
}
pub mod peel {
use crate::{
easy,
easy::{head::Kind, Access, Head},
ext::{ObjectIdExt, ReferenceExt},
};
mod error {
use crate::easy::{object, reference};
#[derive(Debug, thiserror::Error)]
pub enum Error {
#[error(transparent)]
FindExistingObject(#[from] object::find::existing::Error),
#[error(transparent)]
PeelReference(#[from] reference::peel::Error),
}
}
pub use error::Error;
impl<'repo, A> Head<'repo, A>
where
A: Access + Sized,
{
pub fn peel_to_id_in_place(&mut self) -> Option<Result<easy::Oid<'repo, A>, Error>> {
Some(match &mut self.kind {
Kind::Unborn(_name) => return None,
Kind::Detached {
peeled: Some(peeled), ..
} => Ok((*peeled).attach(self.access)),
Kind::Detached { peeled: None, target } => {
match target
.attach(self.access)
.object()
.map_err(Into::into)
.and_then(|obj| obj.peel_to_end().map_err(Into::into))
.map(|peeled| peeled.id)
{
Ok(peeled) => {
self.kind = Kind::Detached {
peeled: Some(peeled),
target: *target,
};
Ok(peeled.attach(self.access))
}
Err(err) => Err(err),
}
}
Kind::Symbolic(r) => {
let mut nr = r.clone().attach(self.access);
let peeled = nr.peel_to_id_in_place().map_err(Into::into);
*r = nr.detach();
peeled
}
})
}
pub fn into_fully_peeled_id(self) -> Option<Result<easy::Oid<'repo, A>, Error>> {
Some(match self.kind {
Kind::Unborn(_name) => return None,
Kind::Detached {
peeled: Some(peeled), ..
} => Ok(peeled.attach(self.access)),
Kind::Detached { peeled: None, target } => target
.attach(self.access)
.object()
.map_err(Into::into)
.and_then(|obj| obj.peel_to_end().map_err(Into::into))
.map(|obj| obj.id.attach(self.access)),
Kind::Symbolic(r) => r.attach(self.access).peel_to_id_in_place().map_err(Into::into),
})
}
}
}